CN105626233A

CN105626233A - Grass trimmer having semi-balance deflection angle and provided with parabolic wing blade LPG (liquefied petroleum gas) engine

Info

Publication number: CN105626233A
Application number: CN201511000474.7A
Authority: CN
Inventors: 苏克; 叶晓波; 胡靖榕; 叶明明; 富田博
Original assignee: Ningbo Daye Garden Equipment Co Ltd
Current assignee: Ningbo Daye Garden Equipment Co Ltd
Priority date: 2015-12-21
Filing date: 2015-12-21
Publication date: 2016-06-01

Abstract

The invention discloses a grass trimmer having the semi-balance deflection angle and provided with a parabolic wing blade LPG (liquefied petroleum gas) engine and solves the problem of axial movement for the original taper of a magnetic flywheel. According to an equation for arcs of blades, the bending angle is 18 degrees, the chord length b is 20, the ratio of a to b is 0.45, and a refers to the maximum deflection point on the bow; an intermediate technician can make a mold module for the wing section contour line. Outer ends of the blades are sharp ends and have cutting edges, so that entangled materials can be cut off conveniently. The balance deflection angle (phi) exists between an angle bisector of the central angle from two sides of an opening, where a C-shaped ring (56a) of a crankshaft valve (56) is mounted, of a crankshaft (57) to a circle center of the crankshaft and a central connecting line from the circle center of the crankshaft to a large-end circle center of a connecting rod and is in the range of 2-22 degrees, and the single-cylinder semi-balance is improved. A cutter is provided with an outer protecting cover (73) mounted on an inner protecting cover (60), and a long grass pressing wheel (74) with the roller length equal to the grass trimming diameter is arranged on the outer protecting cover of the cutter, so that grass pressing water retention and grassland pattern pressing are facilitated; multiple sharp edges (54a) are arranged on a buttress cutting and grass trimming steel wire (54b) of a grass trimming head (54) of the cutter and cut out on the steel wire by a sharp flat-ended chisel under hammering.

Description

The grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve

Technical field

The present invention provides a kind of and cuts off shrub, the grass-mowing machine band grass-mowing machine of flowers and trees shaping for places such as flower bed, garden, park and road sides, belongs to machine field, gardens. By the innovative approach by discharge indirectly after the catalyst hush tube of a meter five, for expanding purposes, brush cutter installs additional disc cutterbar and controlization device four bifurcated nozzle that band cuts the moving head piling up neatly wire of beating the grass and the inside and outside sawtooth of band, and it is convenient to press the long grass pressing wheel of grass soil moisture conservation and meadow decorative pattern, to form Low-emission gasoline brush cutter. Have function wave combustion chamber and with have active receiving electrode and the collocation of oil engine portfire of fine motion electric discharge pole, have and reduce hydrocarbon emission in Jia Shuanfu shirt rim, skirt of piston, and logarithmic differentiation isogonal line shirt rim, skirt of piston turbulent flow returns and alters and fall row, have and narrow the multiple method that block two auxiliary ventage in left and right reduces discharge, the grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve is the engine of low emission, is the present inventor's crystallization that lifetime, domestic and foreign experience was groped; Public affairs know two, and to rush gasoline engine emissions difficulty up to standard, existing energy is up to standard, it has been determined in the application that two rush petrol motor scavenging road junction and has started batch product, imply that the LPG of Two decades years low emission from now on bis-rushes machine and the developing direction of brush cutter and grass-mowing machine, having started the new technical field of the low emission of grass-mowing machine double stroke engine, in tool, metal cover and outer resin cover bilayer cooling sourdine also can be used for multiple field.

Background technology

Brush cutter is widely used in the places such as flower bed, garden, park and road side and prunes lawn, and young growth fosters, and tea place upgrades, and herbage is gathered in, and returns crop stocks to the field, and flowers and trees shaping etc. cut off the operation of shrub branch; It is carry out brush by the mode selected by the hobby of people. Some operation step passerby likes and during custom brush cutter, particularly runs into corner local time, use and press mobile jib energetically, do mobile jib is often located and is not lived and trace waves. The height of operation step passerby is different, and custom takes the difference of work angle, it is necessary to mobile jib adjustable length, and the round type bar mechanism of original location mobile jib, leave the shortcoming easily causing mobile jib trace and rocking. The low vibratility of low vibration grass-mowing machine and low noise, if considering to add the dynamic porous plastics of vibration damping at stock, can have certain curative effect; And vibrate and the very big root of noise not only in precision and the form and position tolerance of power and instrument, and be mechanism, catalyst, hush tube, vibration-damped handle, cutting unit coordinates with the harmony of engine, and low vibration and the low emission of pursuing grass-mowing machine are in fact hard nut to cracks left over for a long time. Adopting two-stroke engine can improve volume power more than 50% relative to Otto cycle engine, but be really difficult up to standard in discharge, this is a part of problem of the present invention; Grass-mowing machine is portable instrument, it is desirable to power is gently little; Double stroke or four-stroke gasoline engine all want portfire, engine sparking plug, are widely used in high voltage pulse electric current is introduced into combustion chamber, make the gas mixture sparking of inspiration cylinder and light, so diffusion combustion and break out work done. Between the outside unitor of existing sparking plug and the spark cap having rubber jar, sometimes there is loosely loose phenomenon. , though being provided with glass-sealing agent to make resistance, but only there is impedance the inside of existing sparking plug; If the induction reactance of adding and capacitive reactance, form suitable RCL loop, then have the effect more preferably suppressing wireless interference. Isolator Shang Duo road umbrella rib also can be improved to saw-tooth shaped cross section by semi-circular cross-section, so that the creepage passage of more insulation and better block rubber jar. The heat radiation of the metal shell of existing sparking plug also can further improve. The electrode of existing sparking plug, well imagines, has easily coking, easy ablation, single-point arcing, the shortcoming of low temperature difficult point; If electrode innovation for movable, when there being improvement. Moreover, original combustion chamber has multiple, and there but do not have to be perfect in every way; Except crossing advantage, there is weak point; Such as wedge shape combustion chamber, its gas mixture undue concentration is at sparking plug place, and operating mode seems rough; And for example bathtub shape combustion chamber, the shape of its flat length, makes the effectiveness comparison of crowded gas poor, and propagation of flame distance is also longer, and rate of combustion is lower, and combustion time is long, and pressure raises than low, and face is relatively bigger than F/V, is disadvantageous to HC discharge. And for example bowl-type combustion chamber, semispherical combustion chamber, fluffy shape combustion chamber, and other type combustion chambers, as produced the auxiliary chamber of turbulent flow, dual ignition plug combustion chamber, the combustion chamber of plane, each has something to recommend him; But it is endless that the mankind pursue perfectly invention, and piston also has very big potentiality to dig. The so-called best geometry of combustion chamber and piston is no doubt important, but will with engine model adaptive and with portfire collocation, just have preferably effect. Particularly two-stroke gasoline engine is more worse than the fuel economy of four-stroke gasoline engine, and the hydrocarbon emission in tail gas often exceeds standard.Combustion chambers of internal combustion engines and piston and the collocation with portfire are hard nut to cracks relating to energy-saving and emission-reduction. If by Otto cycle engine, exert oneself less; If with supercharging blower, volume is big; If with diesel motor, the easily soiled person; The waste gas being run in put by the engine direct near people, hovers around engine, and part waste gas can be sucked by engine air filter and carburettor inlet mouth, and part waste gas can be sucked by people. Brush cutter can only brush and can not beat the grass; Just can dual-use if installing moving head additional at cutter head; The meadow just beaten, some grass has the phenomenon being pulled out pine, if with grass pressing wheel, not only has pressure grass soil moisture conservation and extrudes the effect of meadow decorative pattern, and makes smooth operation and laborsaving; The bush knife of common flat sword, owing to the sliding effect cut is more than cutting the effect cut, encounters hard branch bar and sometimes just allows cutter phenomenon, if just can improve with the cutter of band portion sawtooth; Cut buttress wire life-span of beating the grass long; If admission can be optimized further with the improvement of carburettor four bifurcated nozzle; And public affairs know two rush gasoline engine emissions difficult up to standard after, if being used in Jia Shuanfu shirt rim, skirt of piston and the grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, when improveing further. Sourdine scorches staff not security sometimes. The former tapering of magnetic flywheel has axially alters.

Summary of the invention

In order to make up the shortcoming caused by the existing mechanism of grass-mowing machine, make mobile jib location reliably and trace do not wave, low vibratility and the low noise of brush cutter are improved, improve and exert oneself and cutting effect, reduced exhaust, the present inventor has done the improvement of many brush cutter grass-mowing machines, with containing the single-cylinder air-cooled petrol engine of small two-stroke improving many scavenging ports, such as 1E37F, former stock changes the hush tube of many honeycombs and catalyst into, there is transparent shield cap, there are periphery blade and the bush knife of inner circumferential blade, there is the stock interface not easily loosened of limit flange and side silk button, there are spiral spring or wave spring and the hand handle of vibration damping, there is the carburettor of internal screw whirlpool nozzle, form novel have catalase hush tube and vortex nozzle and two and rush the brush cutter of many scavenging ports petrol motor, it it is a kind of Low-emission gasoline brush cutter. brush cutter can only brush and can not beat the grass, just can dual-use if installing moving head additional at cutter head, the meadow just beaten, some grass has the phenomenon being pulled out pine, if with grass pressing wheel, not only has pressure grass soil moisture conservation and extrudes the effect of meadow decorative pattern, and makes smooth operation and laborsaving, the bush knife of common flat sword, owing to the sliding effect cut is more than cutting the effect cut, encounters hard branch bar and sometimes just allows cutter phenomenon, if just can improve with the cutter of band portion sawtooth, cut buttress wire life-span of beating the grass long, if admission can be optimized further with the improvement of carburettor four bifurcated nozzle, and public affairs are known two to rush gasoline engine emissions difficulty up to standard, it has been found that be used in Jia Shuanfu shirt rim, skirt of piston and return, with oblique wedge turbulent flow, the low emission two altering sheet at scavenging road junction and rush petrol engine, when improveing further and make brush cutter and grass-mowing machine up to standard. therefore for expanding purposes, on Low-emission gasoline brush cutter basis, install moving head additional, grass pressing wheel, band serrated knife, cut buttress and beat the grass wire and the improvement of carburettor four bifurcated nozzle, form Low-emission gasoline brush cutter. the engine of low emission, be oil engine improvement have function wave combustion chamber and with have active receiving electrode and fine motion electric discharge pole oil engine portfire collocation basis on, and reduce on the basis of the petrol engine of hydrocarbon emission in Jia Shuanfu shirt rim, skirt of piston, and alter on the petrol engine basis falling row at logarithmic differentiation isogonal line shirt rim, the skirt of piston turbulent flow time improved, the two auxiliary ventage narrowing left and right block improved further reduces the two of discharge and rushes petrol engine, belongs to the combustion chamber of oil engine and the technical field of turbulent flow scavenging. petrol engine is rushed in low emission two. it is collect the crystallization that domestic and foreign experience for many years gropes, its usefulness achieves unexpected reduction of discharging effect up to standard, and brush grass-mowing machine is dual-purpose.

Silkworm in spring to dead silk not to the utmost, is improved invention and has no limits, wearing out iron shoes on a rare occasion to obtain, oblique footpath is warded off in energy-saving and emission-reduction. everybody knows that two rush machine discharge and often exceed standard, but nobody can thoroughly solve, the oblique wedge turbulent flow in described scavenging road junction returns alters sheet, is add small pieces at the scavenging road junction of two qi of chong channel ascending adversely cylinders, seems simple, and but nobody can find out, be who the unexpected small pieces that to be gone at the scavenging road junction place of cylinder to burn-on be loaded on and start the engine and contact at a high speed with piston, but the sudden caprice often having an examination in arms just has the effect making us surprised, what this is, does not this invent just? this is after travelling far and wide in search of it, thousand consider and occasionally have one to obtain, it is again grope the crystallization with domestic and foreign experience for many years, really have received and reduce discharging effect up to standard. moreover, the carburettor of engine has the potential to be tapped very much, if four bifurcated nozzles refer to along establishing 4 gaps to be four bifurcated nozzles in ring week on the outlet pipe of the nozzle of the inside of carburettor, therefore improves mixing combustion vapour and is beneficial to atomization through the fluid state in gap. although it is very complicated that spark ignition process and two rushes detailed physical and chemical processes, the mankind still have many aspects not clear so far, but we perhaps can tentatively think, this kind of oblique wedge turbulent flow in scavenging road junction returns and alters sheet, at scavenging road junction, place produces turbulent flow with oblique wedge, exhaust gases after combustion is returned the possibility channeling to inlet system and has retardation, its doubtful turbulent flow that belongs to is taken a breath, for the known transverse scavenging of two cycle internal combustion engine, return flow scavenging and uniflow scavenging three kinds ventilation scheme, open an approach altering sheet at scavenging road junction with oblique wedge turbulent flow time that can reduce discharging, referred to as the oblique footpath of turbulent flow scavenging, or the shortcut of low emission. although the mechanism of its atom level needs to be explored future, but it has been determined in the application that two rush petrol motor scavenging road junction and has started batch product, represents the developing direction of Two decades years Low-emission gasoline brush cutter from now on. cut buttress wire of beating the grass more durable than nylon wire many, not only it is beneficial to long-acting cutting, few with line, save into dish nylon wire, and can beat the grass, moreover it is possible to cut straw, and the thin bar that nylon wire cannot not cut dynamicly, beat the grass wire when cutting different object and disc cutterbar complement each other each has something to recommend him. its roller length of long grass pressing wheel diameter that equals to beat the grass then just can be pressed onto the grass just cut, so that pressure grass successful. with the grass pressing wheel of thin length, so that pressure grass soil moisture conservation, material-saving, rolls covering and cuts face height, and meadow embossing line is attractive in appearance.

The present invention solves technical scheme that its technical problem takes and method is:

Described LPG grass-mowing machine, adopt the grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, it it is the engine of low emission, it is near piston upper dead point, before the ignition of mixed gas of piston upper compressed in cylinder, owing to piston skirt pendulum portion moving, the preparation suction opening in opening and closing cylinder is opened, in the crankcase below piston, suck the gas mixture of fuel and air; The pressure of the combustion gases of the piston upper produced due to igniting again, piston moves from upper dead point to bottom dead centre direction and closes suction opening simultaneously, gas mixture in compression crankcase, at the piston upper of bottom dead center-nearby, make the combustion gases in cylinder to while outdoor gas is discharged from opening and closing venting port, the scavenge air belt being connected with cylinder by crankcase, imports to the double stroke engine in cylinder by preparation scavenging port in piston upper opening and closing cylinder by gas mixture from crankcase; The design has the valve gear synchronous with bent axle, and this valve is that the crankcase side of scavenge air belt is configured to normally closed from crankcase to cylinder scavenging mouth; When the valve of the crankcase side of scavenge air belt is closed, gas mixture in scavenge air belt makes it, by the flame of burning gas, burning of igniting, HC reduces later again from crankcase to scavenging port, the crankcase side of scavenge air belt makes it opening, while the burning gas mixture of scavenge air belt is sent, gas mixture in crankcase closes venting port before being discharged from venting port, and this is exactly the double stroke engine discharging significantly minimizing making HC; Filter screen (58) in described scavenging passage or be located at technique butt strip (55) side, or under being located at scavenging passage; The filter screen of described scavenging passage becomes through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder; Being equipped with multiple points that anti-filter screen of making an uproar is provided with to split (11b), it is multiple hollow six prismatics that described point is split, and top has aperture, and the advanced point of air-flow splits compression, then splits aperture effusion from point and expand, and has noise elimination effect; Being equipped with catalyst volume (59) again, it, containing platinum rhodium indium iridium, has catalyst effect to flowing through gas, the ingenious discharge slowing down pneumatic noise and HC.

The grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, for gardens operation, always become containing stock, cutting unit, manipulating handgrip, described stock is containing aluminum pipe, it is provided with transmission shaft in the cavity that described aluminum pipe inside is provided with, engine and engine are equipped with in described aluminum pipe and its upper end of transmission shaft, and described aluminum pipe and its lower end of transmission shaft are equiped with described cutting unit, and the middle part of described aluminum pipe is equiped with hand handle, described grass-mowing machine its containing described double stroke LPG engine and engine (1), interior hexagonal cylindrical head screw M6x30 (2), interior hexagonal cylindrical head screw M5x8 (3), 31 types hex-nut M6 (4), PP wire clamp (5), PA suspension ring (6), 41 types non-metallic insert hexagonal set nut M5 (7), POM suspension ring permanent seat (8), interior hexagonal cylindrical head screw M5x20 (9), before connect aluminum pipe (10), manipulating handgrip always becomes (11), control handle pipe (12), hexagonal cylindrical head screw M5x25 (13) in 13 band spring washers, hand is permanent seat train wheel bridge (14), hand is permanent seat (15), left hand handle component (16), paracril hand is shock-absorbing sleeve (17), hand is permanent seat lower plate (18), left handle pipe (19), five leaf nylon tubesTransmission shaftDeep groove ball bearing III (22), spring washer 6 (23), interior hexagonal cylindrical head screw M6x23 (24), aluminium tube joint (25), locking knob (26), transmission shaft joint (27), rear aluminum pipe 4 interior hexagonal cylindricals head screw M5x12 (29), 4 spring washers 5 (30), spacing handle spring (31), spacing handle lock (32), spacing handle (33), opening back-up ring 2.5 (34), shield cap permanent seat (35), circlip for hole 26 (36), axle elasticity back-up ring 10 (37), small arc-shaped gear (38), small arc-shaped gear oil blocks up (39), interior hexagonal cylindrical head screw M6x14 (40), interior hexagonal cylindrical head screw M6x10 (41), plain washer 6 (42), wheel casing (43), great circle arc gear (44), splined shaft (45), deep groove ball bearing 6002I (46), circlip for hole 32 (47), wheel casing guard shield (48), spline pad (49), disc cutterbar is containing 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or 4 tooth disc cutterbars (64) or 8 tooth disc cutterbars (65), cutterhead pressing plate (51), cutterhead guard shield (52), 1 type hex-nut M10 left-handed (53), or nylon moving head (54), braces (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross groove coiled hair tapping screw ST4x14 (59), shield cap A (60), shielding support (61), interior hexagonal cylindrical head screw M5x35 (62), left hand is (16-1), 1 type hex-head nut M5 (16-2), cross groove coiled hair screw M5x20 (16-3), cross groove coiled hair screw M5x30 (16-4), there is the waistband (66) of pallet (67), assist and turn ball (68), catalyst hush tube (69), described engine (1), with 1E39F, single cylinder 39 cylinder diameter and air-cooled, it always becomes (F1) containing starter, start driver plate assembly (F2), 2 oil sealings (F3), right case (F4), 2 deep groove ball bearing II (F5), flat pad combination screw M5 �� 45 (F6) of hexagonal cylindrical head in 2 moment of torsion 7-9NM, sourdine containing catalyst hush tube (69) always becomes (F7), sourdine pad (F8), the right vibration damping cover (F9) of fuel tank, 2 retaining ring for piston pins (F10), wrist pin (F11), needle bearing (F12), piston (g31), piston ring (F14), crank shaft complement (F15), woodruff-key (F16), cylinder body pad (F17), cylinder body (F18), 2 interior hexagonal cylindrical head groups close screw M5 �� 20 (F19), engine enclosure (F20), coiled hair tapping screw ST5 �� 14 (F21), lighter for ignition always becomes (F22), 2 crosses fluting combination screw M4 �� 20 (F23), sparking plug (F24), without paronite mould assembling pad (F25), 2 mould assembling steady braces (F26), left box body (F27), 5 crosses fluting combination screw M5 �� 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch plate (F31), axle is with elasticity back-up ring (F32), the left shock-absorbing sleeve L (F33) of fuel tank, the right shock-absorbing sleeve R (F34) of fuel tank, inserts bearing connection seat (F35), 3 crosses fluting combination screw M5 �� 20 (F36), train wheel bridge shock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38), train wheel bridge (F39), lower plate (F40), 2 interior hexagonal cylindrical head groups close screw M5 �� 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 air filters seat lining (F44), soft matter polyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 spring washers (F47), 2 crosses fluting coiled hair bullet screw M5 �� 63 (F48), air filter lid (F49), cross fluting coiled hair combination screw M5 �� 14 (F50), 2 air inlet pipe pads (F51), flow deflector (F52), polyphenylene sulfide PPS inlet pipe (F53), grounding wire component (F54), without paronite carburettor pad (F55), carburetor assembly (F56), PU yellow transparent used oil pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter assembly (F60), oil pipe folder (F61), HDPE blowing fuel tank (F62), fuel tank cap assembly (F63), flat pad combination M6X14 (F64) of 5-7NM hexagonal head bolt, 4 3-5NM crosses fluting combination screw M5X18 (F65), its double stroke LPG engine comprised of described grass-mowing machine, by described interior hexagonal cylindrical head screw M6x30 (2), interior hexagonal cylindrical head screw M5x8 (3), and 31 types hex-nut M6 (4), with described before connect aluminum pipe (10) and be connected, connect the outside of the pipe of aluminum pipe (10) before described, by described PP wire clamp (5), PA suspension ring (6), 41 types non-metallic insert hexagonal set nut M5 (7), POM suspension ring permanent seat (8), interior hexagonal cylindrical head screw M5x20 (9) and form braces part with braces (55), braces is worn on single shoulder, connect on aluminum pipe (10) before described, it is equiped with manipulating handgrip always to become (11), hexagonal cylindrical head screw M5x25 (13), hand in control handle pipe (12), many band spring washers, permanent seat train wheel bridge (14), hand is made up of shock-absorbing sleeve (17), hand permanent seat (15), left hand handle component (16), paracril hand permanent seat lower plate (18), left handle pipe (19) jointly, connect the inside of the pipe of aluminum pipe (10) before described, it is equiped with five described leaf nylon tubesTransmission shaftAnd deep groove ball bearing III (22) is so that transmission, connect aluminum pipe (10) before described to be connected with described rear aluminum pipe (28) by described spring washer 6 (23), interior hexagonal cylindrical head screw M6x23 (24), aluminium tube joint (25), locking knob (26), transmission shaft joint (27), and by 4 interior hexagonal cylindricals head screw M5x12 (29), 4 spring washers 5 (30), spacing handle spring (31), spacing handle lock (32), spacing handle (33), opening back-up ring 2.5 (34) and form spacing Handleset, in the end of described rear aluminum pipe (28), it is equiped with described shield cap permanent seat (35), circlip for hole 26 (36), axle elasticity back-up ring 10 (37), small arc-shaped gear (38), small arc-shaped gear oil blocks up (39), and hexagonal cylindrical head screw M5x25 (13) in many band spring washers, interior hexagonal cylindrical head screw M6x14 (40), interior hexagonal cylindrical head screw M6x10 (41), plain washer 6 (42), and wheel casing (43), great circle arc gear (44), splined shaft (45), deep groove ball bearing 6002 (46), circlip for hole 32 (47), wheel casing guard shield (48), spline pad (49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead guard shield (52), described cutting unit contains shield cap and moving head and disc cutterbar to select, fill 1 described type hex-nut M10 left-handed (53) of cutterhead, or dress nylon moving head (54) is to replace disc cutterbar, and the small blade (57) that cut-out is beaten the grass described in line, it is contained on described shield cap A (60) by hexagon nut with flange M5 (56), knife rest (58), cross groove coiled hair tapping screw ST4x14 (59), and shielding support (61) and interior hexagonal cylindrical head screw M5x35 (62) to be installed, cutterhead can select more, or 2 tooth disc cutterbars (63), or 4 tooth disc cutterbars (64), or 8 tooth disc cutterbars (65), so that the vegetation of different varieties is cut in choosing, described left hand handle component (16), left hand, (16-1), 1 type hex-head nut M5 (16-2), cross groove coiled hair screw M5x20 (16-3), cross groove coiled hair screw M5x30 (16-4) are made up of, it are arranged in left handle pipe (19), and have the waistband (66) of pallet (67), people's waist can be tied up to, pallet (67) turns ball (68) movable contact with auxiliary, auxiliary turn ball (68) and is connected with engine enclosure (F20), to lengthen cut coverage further, catalyst hush tube (69), connects the air outlet that sourdine always becomes (F7), so that waste gas is discharged near cutter through aluminum pipe, the engine starting part of described double stroke LPG engine comprises starter and always becomes (F1), starts driver plate assembly (F2), be furnished with 2 oil sealing (F3) and 2 deep groove ball bearing II (F5), to be contained on the described right case (F4) of engine rotationally, by flat pad combination screw M5 �� 45 (F6) of hexagonal cylindrical head in 2 moment of torsion 7-9NM, sourdine containing catalyst hush tube (69) is always become (F7) and sourdine pad (F8), is fixed on cylinder body (F18), cylinder body (F18) is equipped with the right vibration damping cover (F9) of fuel tank, at cylinder body (F18) built with 2 retaining ring for piston pins (F10), wrist pin (F11), needle bearing (F12), piston (F13), piston ring (F14) and crank shaft complement (F15), bent axle is established woodruff-key (F16), cylinder body pad (F17) is mounted on cylinder body (F18), 2 interior hexagonal cylindrical head groups conjunction screw M5 �� 20 (F19) and coiled hair tapping screw ST5 �� 14 (F21) are fixed on engine enclosure (F20) on cylinder body (F18), lighter for ignition always becomes (F22) to be fixed by 2 crosses fluting combination screw M4 �� 20 (F23), sparking plug (F24) is also contained on cylinder body (F18), cylinder body (F18) is put without paronite mould assembling pad (F25), 2 mould assembling steady braces (F26), and fix left box bodies (F27) with 5 crosses fluting combination screw M5 �� 25 (F28), magnetic flywheel (F29) is contained on bent axle, and matches with clutch assembly (F30), clutch plate (F31) and axle elasticity back-up ring (F32), fuel tank left shock-absorbing sleeve L (F33) and fuel tank right shock-absorbing sleeve R (F34) are contained on described outer cover (20), inserts bearing connection seat (F35) is fixed by 3 crosses fluting combination screw M5 �� 20 (F36), described connection seat (F35) is equipped with train wheel bridge shock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38) and train wheel bridge (F39) lower plate (F40) and closes screw M5 �� 18 (F41) by 2 interior hexagonal cylindrical head groups and clamp, described connection seat (F35) is also equipped with flame-out wire clamp (F42), air filter seat (F43), 2 air filters seat lining (F44), soft matter polyurethane foam filter core (F45), air filter pressing plates (F46) are formed air filter by 2 M5 spring washers (F47) and 2 crosses fluting coiled hair bullet screw M5 �� 63 (F48) air filter lid (F49), crosses fluting coiled hair combination screw M5 �� 14 (F50), and are packed on carburettor, 2 air inlet pipe pads (F51), flow deflector (F52), polyphenylene sulfide PPS inlet pipe (F53), grounding wire components (F54), form carburettor without paronite carburettor pad (F55), carburetor assembly (F56), PU yellow transparent used oil pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter assembly (F60), oil pipe folder (F61), HDPE blowing fuel tank (F62), fuel tank cap assembly (F63) form fuel tank, and flat pad combination M6X14 (F64) of 5-7NM hexagonal head bolt is fixing described startup driver plate assembly (F2), as 4 3-5NM crosses rises groove combination screw M5X18 (F65) be fixing described in starter always become (F1), the described waistband (66) of pallet (67) that has is provided with pallet (67), pallet (67) can be placed assist and turn ball (68), and auxiliary turn ball (68) and be contained in external engine, or directly grass-mowing machine engine is placed on the pallet (67) that waistband (66) is provided with comes up operation, pallet (67) turns ball (68) movable contact with auxiliary, auxiliary turn ball (68) and is connected with engine enclosure (F20), to lengthen cut coverage further, catalyst hush tube (69), the air outlet that sourdine always becomes (F7) is connected in its one end, connects aluminum pipe before another termination, so that waste gas aluminum pipe after described, and discharge near cutter, described catalyst hush tube (69) is aluminium system, has waste gas by there to be aluminium dioxide catalyst effect, described sourdine always becomes (F7) to be aluminium system, has waste gas by just there being aluminium dioxide catalyst effect, connect aluminum pipe (10) before described and rear aluminum pipe (28) separates, have waste gas by there to be aluminium dioxide catalyst effect, foam honeycomb body established by five leaf nylon tubes in aluminum pipe in the rear, and adds catalyst catalyzer at foam honeycomb body, so as to have waste gas by time have catalyst multiple catalyzing effect, 2 described tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) are for selecting, the disc cutterbar being commonly referred to as cutting unit, it is provided with multiple outer cutting edge (641) in cutterhead periphery, so that brush allows cutter less, described 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65), it is provided with multiple inner cutter hole (642) in cutterhead periphery, so that card branch in brush, in described carburetor assembly (F56), the interior straight pipe (70) improving oil nozzle, for there being the vortex spray bar of spiral slot (71), is beneficial to disperse mixed effect, in described carburetor assembly (F56), improve the interior straight pipe (70) of oil nozzle or have the import of the vortex spray bar of spiral slot (71) for there being parabolical hydraucone (72), or two conic sections are such as the hydraucone of archimedes curve, it is beneficial to polymerization contaminated product effect, in described left handle pipe (19), it is provided with damping adapter (19b) of close circle whisker shape, so that damping further, adopt and have shield cap (60) that is transparent or partially transparent, operate in order to convenient observation cutting, tool half balance drift angle and the wing blade LPG engine of para-curve that the small two-stroke that this grass-mowing machine adopts is single-cylinder air-cooled, belong to the engine of low emission, be oil engine improvement have function wave combustion chamber and with have active receiving electrode and fine motion electric discharge pole oil engine portfire collocation basis on, and reduce on the basis of the petrol engine of hydrocarbon emission in Jia Shuanfu shirt rim, skirt of piston, and alter on the petrol engine basis falling row at logarithmic differentiation isogonal line shirt rim, the skirt of piston turbulent flow time improved, the two auxiliary ventage narrowing left and right block improved further reduces the two of discharge and rushes petrol engine, in Jia Shuanfu shirt rim, skirt of piston, have and reduce discharging effect up to standard, logarithmic differentiation isogonal line shirt rim, skirt of piston turbulent flow returns and alters the petrol engine falling row is be equipped with two auxiliary shirt rim (g37) in the skirt section of piston (g31), instituteTool module just can criticize product; When designing the cross-sectional shape of wing blade, key is to determine the equation of the arc of its blade; Getting bending angle is 18 degree, and chord length b is 20, a/b=0.45; A is the maximum defluxion point on string bow; The parabolical general equation of the true origin of substitution cartesian geometry just can solve and obtain; Middle rank technician can make the die module of aerofoil cross section skeletal lines; The outer end of described blade is most advanced and sophisticated, is beneficial to and smoothly gives vent to anger and reduce disorderly eddy current, and have cutting edge, is beneficial to excision twister; Tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine it is characterized in that, the dual-side of the opening adding C type circle (56a) of crank valve (56) on its bent axle (57) has balance drift angle (��) between point angle line and the bent axle center of circle to the center line in the big end center of circle of the central angle in the bent axle center of circle, at 2 to 22 degree.

Update and perfect described tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, it is characterized in that, it contains the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the gap (56 ��) between the oral area of the connection crankcase of the scavenging passage of the cylinder of the external diameter distance engine 1E37F of the outer circle of described C type circle is at 0.02-0.07 millimeter; It is further characterized in that, described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 82-92 degree. It is characterized in that, it contains the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 84-88 degree; Compression ratio is not more than 12. It is characterized in that, described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is corresponding with a segment opening of described C type circle (56a) adding crank valve (56) and realizes coordinating by a pilot hole. Described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is corresponding with a segment opening of described C type circle (56a) adding crank valve (56) and passes through a steady brace, or locating sleeve coordinates, and fix with three screws. There is the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening or establishes the pressure circle (56f) of logarithm line, when the logarithmic spiral side of dual-side of a segment opening of described pressure circle is with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, the logarithmic spiral of mineralization pressure angle properties equivalent everywhere is affected to the effect of air-flow and buffering. Valve gear is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, when the side at described oblique angle is with crankshaft rotation, just form shear flow when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder and reduce the effect that sudden change impacts.

Update and perfect described tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, it is characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, the angle of the axis of the oblique angle that the dual-side of one segment opening of the oblique wedge circle (56b) of the C type circle of described crank valve (56) is provided with and every limit bent axle is at 15-27 degree, when described C type circle oblique wedge circle (56b) a segment opening dual-side have the side at oblique angle with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, just form shear flow and the slow effect fallen sudden change and impact.

Update and perfect described tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, it is characterized in that, filter screen (58) in described scavenging passage is located at described technique butt strip (55) side, and under the filter screen (58) in described scavenging passage is located at scavenging passage; The described filter screen in scavenging passage is the two coarse filtration combination thin filter cushion valve chamber become through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder; Two coarse filtration combination thin filter cushion valve chamber that many wire become through knitting device is provided with catalyst volume (59) of reduction of discharging, it is containing platinum, rhodium, indium, catalyst effect and anti-filtration regulating and controlling effect of making an uproar is had to flowing through gas, the regular hour is had to postpone difference and isolation and eliminate the noise and obstruct regulating effect, the ingenious discharge slowing down pneumatic noise and HC.

Usefulness is: tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine be of value to cooling and eliminate the noise; Its rotating speed be every minute 5750 to 6950 turns; Filter screen (58) in its scavenging passage is 70 object coarse strainers; And separately to have filter screen (58) to be located under scavenging passage be hold concurrently scavenging oral area cushion valve by the 170 thin filter screens of object. The dual-side of the opening adding C type circle (56a) of crank valve (56) on its bent axle (57) has balance drift angle (��) between point angle line and the bent axle center of circle to the center line in the big end center of circle of the central angle in the bent axle center of circle, at 2 to 22 degree; Multiple sawtooth established by cutting unit, updates and perfect double stroke engine improves the quality of gardens machine, and solving the former tapering of magnetic flywheel has the problem axially altered, improves leaf quality, improves single cylinder half balance.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the schematic diagram of brush cutter.

Fig. 2 is the exploded perspective view of upper part of brush cutter.

Fig. 3 is the exploded perspective view of lower part of brush cutter.

Fig. 4 is the schematic diagram removing outer cover and shield cap of brush cutter.

Fig. 5 is the exploded perspective view of brush cutter containing engine.

Fig. 6 is the diagrammatic cross-section of the carburetion body containing four bifurcated nozzles (70a) of brush grass-mowing machine engine.

Fig. 7 is the schematic perspective view that brush grass-mowing machine engine and carburetor always becomes the carburetion body containing oil nozzle of (F56).

Fig. 8 is the schematic perspective view of brush grass-mowing machine with the disc cutterbar having inner cutter hole (642) and outer cutting edge (641).

Fig. 9 is the local schematic top plan view of brush grass-mowing machine with the disc cutterbar having inner cutter hole (642) and outer cutting edge (641).

Figure 10 is that outer protective cover is provided with its roller length and equals to beat the grass the schematic perspective view of long grass pressing wheel (74) of diameter.

Figure 11 is the schematic perspective view of the disc cutterbar of the long grass pressing wheel of band of brush grass-mowing machine.

Figure 12 is the schematic perspective view of the disc cutterbar that the stock of brush grass-mowing machine and band are beaten the grass.

Figure 13 is the schematic perspective view of the disc cutterbar that the band of brush grass-mowing machine is beaten the grass.

Figure 14 is the diagrammatic cross-section of piston.

Figure 15 is the schematic perspective view that the oblique wedge turbulent flow time in band scavenging road junction alters that gasoline engine cylinder is rushed in the two of sheet reduction discharge.

Figure 16 is the partial enlargement schematic diagram that the oblique wedge turbulent flow time in band scavenging road junction alters that gasoline engine cylinder is rushed in the two of sheet reduction discharge.

Figure 17 is that the two auxiliary ventage narrowing left and right block reduces discharge two schematic diagram rushing the front of the left block of petrol engine.

Figure 18 is that the two auxiliary ventage narrowing left and right block reduces discharge two schematic diagram rushing the reverse side of the left block of petrol engine.

Figure 19 is two schematic perspective views rushing the installation position of petrol engine former left and right block.

Figure 20 is that the two auxiliary ventage narrowing left and right block reduces the schematic diagram that the right block of petrol engine is rushed in the two of discharge.

Figure 21 is the schematic diagram that the two auxiliary ventage narrowing left and right block reduces that the two auxiliary ventage narrowed of left and right block that the two of discharge rushes petrol engine closes on the piston adding pair auxiliary shirt rim.

Figure 22 is that the two auxiliary ventage narrowing left and right block reduces the midship section schematic diagram that the left block of petrol engine is rushed in the two of discharge.

Figure 23 be scavenging road junction be equipped with the cylinder body of technique butt strip (55) the schematic diagram of an angle again.

Figure 24 is the schematic diagram of the cylinder body of the two-cycle gasoline engine of the layered scavenging that partial cut-out demonstrates in cylinder.

Figure 25 is the schematic diagram that partial cut-out demonstrates the layering gas storage piston cuing open cross section.

Figure 26 is the schematic diagram of the layering gas storage piston of partial cut-out.

Figure 27 is the schematic diagram that partial cut-out demonstrates the layering gas storage piston cuing open cross section.

Figure 28 is the schematic diagram that local crosscut demonstrates the layering gas storage piston of cutting cross section.

Figure 29 is the front elevational schematic of layering gas storage piston.

Figure 30 is the schematic diagram that the complete section of layering gas storage piston cuts cross section.

Figure 31 is the schematic diagram of layering gas storage piston and crankshaft-link rod.

Figure 32 is the schematic diagram of the cylinder body of the two-cycle gasoline engine of the layered scavenging that partial cut-out demonstrates in cylinder.

Figure 33 is the schematic diagram of the cylinder body of the two-cycle gasoline engine of the layered scavenging removing butt strip and demonstrating in cylinder.

Figure 34 is the schematic diagram of conventional crankshaft-link rod.

Figure 35 is the bent axle (57) of C type circle (56a) adding crank valve (56) and the schematic diagram of connecting rod.

Figure 36 is the schematic diagram adding C type circle (56a) of crank valve (56) and the cylinder body of two-cycle gasoline engine.

Figure 37 is the schematic diagram adding C type circle (56a) of crank valve (56) and the cylinder body of gap (56 ��) and two-stroke engine.

Figure 38 is the diagrammatic cross-section of bent axle (57) and the connecting rod piston adding crank valve (56).

Figure 39 is the schematic diagram at the C type edge (57a) of the bent axle (57) adding crank valve (56).

Figure 40 is the schematic diagram adding C type circle (56a) of crank valve and the cylinder body of two-stroke engine.

Figure 41 is the schematic diagram of the oblique wedge circle (56b) adding crank valve (56).

Figure 42 is the schematic diagram of the pressure circle (56f) adding crank valve (56).

Figure 43 is the schematic diagram of the filter screen in scavenging passage (58).

Figure 44 is the schematic diagram that the point that subtracting in scavenging passage is made an uproar splits (11b).

Figure 45 is the schematic diagram that the point that subtracting in scavenging passage is made an uproar splits the side again of (11b).

Figure 46 is the schematic diagram of the side again of catalyst volume (59) of the reduction of discharging in scavenging passage.

Figure 47 is the diagrammatic cross-section of point on upstroke to scavenging port.

Figure 48 is the diagrammatic cross-section of point under upstroke to scavenging port.

Figure 49 is the diagrammatic cross-section of upstroke to top dead center.

Figure 50 is the diagrammatic cross-section that descent of piston is in position on venting port top.

Figure 51 is the diagrammatic cross-section of point on descent of piston to scavenging port.

Figure 52 is the diagrammatic cross-section of piston to lower dead center.

Figure 53 is the diagrammatic cross-section of exhaust close.

Figure 54 is that suction opening starts diagrammatic cross-section when opening.

Figure 55 adds two screen cloth at scavenging passage to hold concurrently the diagrammatic cross-section of two-cycle gasoline engine of scavenging oral area cushion valve.

Figure 56. it is the noise figure of a kind of method of computer numerical secondary analog aerodynamic force noise analysis.

Figure 57. it is the schematic diagram of two-cycle gasoline engine LPG propane container (t20).

Figure 58. it is the schematic diagram of the rear side in two coarse filtration combination thin filter cushion valve chamber.

Figure 59. it is the schematic diagram in two coarse filtration combination thin filter cushion valve chamber.

Figure 60. it is the schematic perspective view that the cutting of metal cover and outer resin cover bilayer cooling sourdine in tool is opened.

Figure 61. it is the diagrammatic cross-section of metal cover and outer resin cover bilayer cooling sourdine in tool.

Figure 62. it is the schematic diagram of magnetic flywheel.

Figure 63. it is the cut-away illustration of magnetic flywheel. In figure: 31a. is gas storage pit; 31b. is the crosscut section line of gas storage pit;

1. it is double stroke engine; 2. it is interior hexagonal cylindrical head screw M6x30; 3. it is interior hexagonal cylindrical head screw M5x8; 4. it is 1 type hex-nut M6; 5. it is PP wire clamp; 6. it is PA suspension ring; 7. it is 41 type non-metallic insert hexagonal set nut M5; 8. it is POM suspension ring permanent seat; 9. it is interior hexagonal cylindrical head screw M5x20; 10. before being, connect aluminum pipe11. is that manipulating handgrip always becomes; 12. is control handle pipe; 13. is hexagonal cylindrical head screw M5x25 in 13 band spring washers; 14. is that hand is permanent seat train wheel bridge; 15. is that hand is permanent seat; 16. is left hand handle component; 17. is that paracril hand is shock-absorbing sleeve; 18. is that hand is permanent seat lower plate; 19. is left handle pipe; 20. is five leaf nylon tubes21. is transmission shaft22. is deep groove ball bearing; 23. is spring washer 6; 24. is interior hexagonal cylindrical head screw M6x23; 25. is aluminium tube joint; 26. is locking knob; 27. is transmission shaft joint; 28. is rear aluminum pipe29. is 4 interior hexagonal cylindrical head screw M5x12; 30. is 4 spring washers 5; 31. is spacing handle spring; 32. is spacing handle lock; 33. is spacing handle; 34. is opening back-up ring 2.5; 35. is shield cap permanent seat; 36. is circlip for hole 26; 37. is axle elasticity back-up ring 10; 38. is small arc-shaped gear; 39. is that small arc-shaped gear oil blocks up; 40. is interior hexagonal cylindrical head screw M6x14; 41. is interior hexagonal cylindrical head screw M6x10; 42. is plain washer 6; 43. is wheel casing; 44. is great circle arc gear; 45. is splined shaft; 46. is deep groove ball bearing 6002; 47. is circlip for hole 32; 48. is wheel casing guard shield; 49. is spline pad; 50. is 3 tooth disc cutterbars; 51. is cutterhead pressing plate; 52. is cutterhead guard shield; 53. is that 1 type hex-nut M10 is left-handed; 54. is nylon moving head; 54a. is point sword; 54b. cuts buttress to beat the grass wire; 55. is braces; 56. is hexagon nut with flange M5; 57. is small blade; 58. is knife rest; 59. is cross groove coiled hair tapping screw ST4x14; 60. is interior shield cap; 61. is shielding support; 62. is interior hexagonal cylindrical head screw M5x35; 63. is 2 tooth disc cutterbars; 64. is disc cutterbar; 65. is 8 tooth disc cutterbars; 16-1. is left hand handle; 16-2. is 1 type hex-head nut M5; 16-3. is cross groove coiled hair screw M5x20; 16-4. is cross groove coiled hair screw M5x30; 66. is the waistband having pallet; 67. is pallet; 68. is assist to turn ball; 69. is catalyst hush tube; 70. is the interior straight pipe of oil nozzle; 70a. is four bifurcated nozzles; 71. is the vortex spray bar having spiral slot; 72. be oil nozzle have parabolical hydraucone; 73. is outer protective cover; 73a. is position, screw hole; 73b. is installing card groove; 73c. is the spacing of rope of beating the grass; 73d. is that grass pressing wheel installs bar; 73e. is arc enclosing bar; 74. is long grass pressing wheel; 641. is outer cutting edge; 64a. is outer sawtooth; 642. is inner sawtooth; 74a. is the pressure grass slot cross-section of long roller grass pressing wheel; 74b. is multiple pressure grass groove of long roller grass pressing wheel; 19b. is damping adapter (19b) having close circle whisker shape; F1. it is that starter always becomes; F2. it is start driver plate assembly; F3. it is 2 oil sealings; F4. it is right case; F5. it is 2 deep groove ball bearings; F6. it is hexagonal cylindrical head flat pad combination screw M5 �� 45 in 2 moment of torsion 7-9NM; F7. it is that the sourdine contacting matchmaker's hush tube (69) always becomes; F8. it is sourdine pad; F9. it is the right vibration damping cover of fuel tank; F10. it is 2 retaining ring for piston pins; F11. it is wrist pin; F12. it is needle bearing; F14. it is piston ring; F15. it is crank shaft complement; F16. it is woodruff-key; F17. it is cylinder body pad; G44. it is cylinder body; F19. it is that 2 interior hexagonal cylindrical head groups close screw M5 �� 20; F20. it is engine enclosure; F21. it is coiled hair tapping screw ST5 �� 14; F22. it is that lighter for ignition always becomes; F23. it is 2 cross fluting combination screw M4 �� 20; F24. it is sparking plug; F25. it is without paronite mould assembling pad; F26. it is 2 mould assembling steady braces; F27. it is left box body; F28. it is 5 cross fluting combination screw M5 �� 25; F29. it is magnetic flywheel; F30. it is clutch assembly; F31. it is clutch plate; F32. it is axle elasticity back-up ring; F33. it is the left shock-absorbing sleeve L (F33) of fuel tank; F34. it is the right shock-absorbing sleeve R of fuel tank; F35. it is inserts bearing connection seat; F36. it is 3 cross fluting combination screw M5 �� 20; F37. it is train wheel bridge shock-absorbing sleeve; F38. it is lower plate shock-absorbing sleeve; F39. it is train wheel bridge;F40. it is lower plate; F41. it is that 2 interior hexagonal cylindrical head groups close screw M5 �� 18; F42. it is flame-out wire clamp; F43. it is air filter seat; F44. it is 2 air filter seat linings; F45. it is soft matter polyurethane foam filter core; F46. it is air filter pressing plate; F47. it is 2 M5 spring washers; F48. it is 2 cross fluting coiled hair bullet screw M5 �� 63; F49. it is air filter lid; F50. it is cross fluting coiled hair combination screw M5 �� 14; F51. it is 2 air inlet pipe pads; F52. it is flow deflector; F53. it is polyphenylene sulfide PPS inlet pipe; F54. it is grounding wire component; F55. it is without paronite carburettor pad; F56. it is carburetor assembly; F57. it is PU yellow transparent used oil pipe; F58. it is PU black oil inlet pipe; F59. it is oil-resistant acrylonitrile-butadirubber rubber oil pipe seat; F60. it is fuel filter assembly; F61. it is oil pipe folder; F62. it is HDPE blowing fuel tank; F63. it is fuel tank cap assembly; F64. it is the flat pad combination M6X14 of 5-7NM hexagonal head bolt; F65. it is 4 3-5NM cross fluting combination screw M5X18; G31. it is piston (g31); G37. it is two auxiliary shirt rims (g37); G38 is the base (g38) of two auxiliary shirt rim; G39 is lower fillet (g39); G40. it is the side (g40) of two auxiliary shirt rim; G41. it is upper fillet (g41); G42. it is the recessed arc limit (g42) on base; G43. it is piston and the through hole (g43) of two auxiliary shirt rim; G44. it is cylinder body (g44); G45. it is scavenging road junction (g45); G46. it is that oblique wedge turbulent flow time alters sheet (g46); G47. it is that oblique wedge turbulent flow goes back to the scavenging road junction (g47) altering sheet; G48. it is the oblique wedge (g48) at logical scavenging road junction; G49. be oblique wedge turbulent flow return alter sheet logical scavenging road junction return alter grid (g49); G50. it is the turbulent shield (g50) at logical scavenging road junction; 51b. is left two auxiliary ventage (51b); 52b. is right two auxiliary ventage (52b); G51. it is left block; 51b. is left two auxiliary ventage; 51C. is long stiffening web; 51d. is short stiffening web; 51e. is reinforcement arm pawl; 51f. is rear wall; G52. it is right block; 52b. is right two auxiliary ventage; 53. is that two air flue walls are also called scavenging duct partition wall; 53a. is the foot of a wall portion; 53b. is rear metope; 53c. is front metope; 53d. is wall end; 53j. is Fourier function breach; 54. is tool periodic function gibbs overshoot convergence ripple Fourier sheet wall; 54j. is transition flex point; 54k. is fluctuating convex-concave; 51g. is left tiltedly side; 51y. is left straight sided; 51h. is left broad side surface; 52g. is right tiltedly side; 52y. is right straight sided; 52h. is right broad side surface; 31a. is gas storage pit; 31b. is crosscut section line; 44a. is ventage; 44b. is into gas port; 44c. is into air mouth; 44d. is the first scavenging port; 44f. is the 2nd scavenging port; 44e. is envelope high-wall; 55. is technique butt strip; 55g. is that interval is stupefied; 55e. is interval breach; 55d. is the first scavenging side wall; 55d. is the 2nd scavenging side wall; 44j. is through heat radiation hole; 44k. is straight-through heat radiation hole; (44x, 44v) strengthens heat radiation in flakes; 56. is crank valve; 56a. is C type circle; 57. is bent axle; 566. is gap; 57a. is C type edge; 56b. is oblique wedge circle; 56f. is pressure circle; 58. is filter screen; 59. is catalyst volume; T20. it is miniature LPG propane fuel tank; T20c. it is tank base disk; T20d. it is the base holes of tank base disk (t20c); F7C1. it is interior metal cover; F7C2. it is inner outlet; F7j1. it is outer resin cover; (F7j2). it is outer outlet; F7j3. it is log channel; F29a. blade;F29b. tapering; F29c. keyway.

Embodiment

For making up the phenomenon that mobile jib trace caused by the existing mechanism of brush grass-mowing machine rocks, using the main aluminium bar of a kind of length for the improvement of brush cutter provided by the invention as in catalyst hush tube loading machine, and use F41 screw fastening; Waste gas is always become and catalyst hush tube 69 by sourdine, then by long main aluminium bar, and discharge from the gap of the close cutter of aluminium boom end or aperture gap.

Grass-mowing machine two-stroke engine can improve volume power more than 50% relative to Otto cycle engine, but to be taken measures in discharge; Grass-mowing machine is portable instrument, it is desirable to power is gently little; Former stock changes the hush tube of many honeycombs and catalyst into, distally discharges; Usefulness changes originally to hover around by the waste gas put that runs in of the engine direct near people, part waste gas can be sucked by engine and carburetor inlet mouth, and the situation that part waste gas can be sucked by people, after catalyst hush tube, the method for indirectly discharge makes that discharge is low and discharge outlet is a little away from people, safer, and reduce discharging increasing power; Transparent shield cap is had to be more convenient for observing, additionally provide the operating method of the new pallet waistband of brush cutter, when expanding operating radius, in other words when running into big shrub, when reaching treetop, when maybe being cut at a distance and have puddle to stop, by lengthening mode engine being put into pallet waistband, cutterhead is extended, and this is easily more stable operation also. There is transparent shield cap, it is on the shield cap of cutter, local transparent or all transparent, can observe better and cut off and operate, reduce jam. There are periphery blade and the bush knife of inner circumferential blade, it is evident that what improve brush allows branch and jam. The stock interface not easily loosened also having limit flange and side silk button, has the hand handle of spiral spring or wave spring and vibration damping, has the carburettor of internal screw whirlpool nozzle; Environmental protection quality and the usability of grass-mowing machine is improved with Low-emission gasoline machine and multinomial measure. Low-emission gasoline grass-mowing machine is characterized in that described cutting unit beats the grass the moving head 54 of wire 54b in order to long-acting cutting containing with cutting buttress, and disc cutterbar 64 with inner sawtooth 642 is in case allow cutter; And the carburettor of its engine establishes four bifurcated nozzle 70a in order to atomization; And described cutting unit is provided with interior shield cap 60 and outer protective cover 73 and is provided with its roller length on its outer protective cover and equals to beat the grass the long grass pressing wheel 74 of diameter so that pressure grass soil moisture conservation and meadow decorative pattern, therefore its usefulness is many.

Moving head 54 contained by the cutting unit of low emission grass-mowing machine with cut buttress beat the grass wire 54b be provided with multiple point sword 54a, its multiple point sword way be cut to pile up neatly under hammering with sharp flat engraving tool on wire. Or, the moving head 54 contained by cutting unit with cut buttress beat the grass wire 54b be provided with multiple point sword 54a, its multiple point sword way be with there being the plunger chip die of sharp edge to cut to pile up neatly under the impact of stamping machine on wire. Cut buttress wire of beating the grass more durable than nylon wire many; When cutting different object, beat the grass wire and disc cutterbar complement each other each has something to recommend him. The outer cutting edge 641 of the periphery of 4 cuttves stretched out that the disc cutterbar 64 of the inner sawtooth 642 of band contained by cutting unit is provided with is provided with multiple outer sawtooth 64a, and described inner sawtooth 642 also has 4, and its inner sawtooth of every bar 642 establishes multiple sawtooth, therefore handy. The outer protective cover 73 installed on the interior shield cap 60 that cutting unit is equipped with is provided with installing card groove 73b and 2 screw hole position 73a in order to installation, and on its outer protective cover 73, it is provided with the spacing 73c of rope of beating the grass, and on its outer protective cover 73, be provided with the grass pressing wheel for installing long grass pressing wheel 74 bar 73b and arc enclosing bar 73b is installed, therefore it is easy to install. Its 2 times are described diameter of beating the grass; Its roller length of long grass pressing wheel 74 diameter that equals to beat the grass then just can be pressed onto the grass just cut, therefore pressure grass successful. Its roller length equal to beat the grass long grass pressing wheel 74 of diameter is rotating, the axial length of its grass pressing wheel and the long-range diameter being greater than its grass pressing wheel of roller, that is, the axial length of its grass pressing wheel and roller length are 10 times of the diameter of its grass pressing wheel, both it had been convenient to press grass soil moisture conservation, material-saving again, and if because relatively carefully just rolling a few circle and be conducive to pressure grass in same distance wheel footpath of advancing more. Wheel too slightly then takes material. What also turn is excessively slow, and dash is few, rolls difference. Roller length is convenient to covering and is cut face, efficiency height; So with the grass pressing wheel of thin length. The long grass pressing wheel 74 of diameter of equaling because of its described roller length to beat the grass again is provided with multiple pressure grass groove 74b, and its groove is along its roller length direction or straight groove, or the bending groove of waviness; And the described pressure grass slot cross-section 74a of groove or square, or semicircle, therefore it is convenient to press grass soil moisture conservation and meadow embossing line and few skidding. Moreover, the carburettor of described engine establishes bifurcated nozzle 70a to refer to along establishing multiple gap to be bifurcated nozzle 70a in ring week on the outlet pipe of the nozzle 70 of the inside of carburettor, therefore improves mixing combustion vapour and be beneficial to atomization through the fluid state in gap; The carburettor of its described engine establishes bifurcated nozzle 70a to refer to along establishing 4 gaps to be bifurcated nozzle 70a in ring week on the outlet pipe of the nozzle 70 of the inside of carburettor, is beneficial to atomization to improve mixing combustion vapour through the fluid state in gap. Or in described carburetor assembly F56, the interior straight pipe 70 improving oil nozzle is for having also along establishing multiple gap to be four bifurcated nozzle 70a in ring week on the outlet pipe of the vortex spray bar of spiral slot 71, or is 3 bifurcateds, or be 5 bifurcateds, or be six bifurcateds, or be 7 bifurcateds, or be eight bifurcateds; If 1 gap, or 2 gaps, then go out vapour not even; If more than 9 gaps, because outlet pipe is less than 3mm, then gap is too fine and closely woven. when oil vapour straight pipe 70 or have the import of the vortex spray bar of spiral slot 71 to be set to have the hydraucone of the archimedes curve of parabolical hydraucone 72 or two conic sections to pour described interior straight pipe 70 and have the vortex spray bar of spiral slot 71 in improvement oil nozzle in described carburetor assembly F56, and then extrude along 4 gaps established in ring week or 3-8 gap to multi-direction dispersion from the outlet pipe of described spray bar again, instead of only extrude from a hole to a direction, again due on described outlet pipe along multiple formed between ring week multiple gaps of establishing its have a vibration back and forth trembled because of socle girder principle and the effect of adding fuel to the flames to steam flow, will in the air-breathing moment of petrol motor, at the aditus laryngis key position of this trunnion, it is more conducive to be polymerized contaminated product effect and disperse mixed effect when sharply mixed friendship is atomized accelerating fluid with the air-flow come from air filter, with the carburetion state being more atomized enter two rush petrol motor cylinder body g44 symmetry left and right each scavenging road junction g45 in, the oblique wedge turbulent flow being provided with through it again return alter sheet g46 effect and enter two rush the piston of petrol motor and combustion chamber that cylinder body is formed thus be beneficial to week and back and forth work.Public affairs know the air flow quantity coefficient of carburettor in Reynolds number 8x (1000-100000) scope only about 0.05, and the orifice coefficient in primaries hole sharply increases with increase and the Reynolds number increase of the aditus laryngis vacuum tightness of this trunnion thus causes Carburettor performace curve to reduce and make mixture strength be tending towards enriching; Multiple of the aditus laryngis of this trunnion its have the vibration back and forth trembled more be conducive to accelerate atomization namely accelerate carburetion. Oblique wedge that the scavenging road junction 945 of the two auxiliary ventage and cylinder body 944 that narrow left and right block is provided with turbulent flow returns alters sheet 946, and two auxiliary shirt rim 937 three being equipped with the skirt section of piston joins use, has and more falls row's effect. It is collect the crystallization that domestic and foreign experience for many years gropes; Having the reduction of discharging of batch production effect up to standard, not only can reach 50 grams of marks, and can drop to 39.9 grams, safety coefficient is big, and waster is few, and large quantities of volume production is had significance by this. It has determined and has started to criticize to produce in the application of double stroke engine, imply that the developing direction of the LPG grass-mowing machine of Two decades years low emission from now on. The present invention relates to the noise elimination of double stroke engine improvement, have function wave combustion chamber and mobile electrode collocation, have two auxiliary shirt rim, there is the oblique wedge sheet of scavenging duct, energy-saving and emission-reduction are up to standard, and multi-functional, tool half balance drift angle and para-curve wing blade LPG engine its bright spot of grass-mowing machine remarkable; But it is endless that the mankind pursue perfectly invention, therefore weaves silk and repeat not to the utmost in the hope of casting a brick to attract jade.

Scavenging is taken a breath, scavenging passage adds catalyst volume, add filter screen (58), if technique butt strip (55), if multiple point is split (11b), C shape valve etc. style, in two-cycle gasoline engine, opens multiple new way that can reduce discharging at scavenging duct, although the mechanism of its atom level needs to be explored future, but it is determined in the application of two-stroke gasoline engine scavenging duct.

A kind of tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, comprise cylinder body, and known combustion chamber, sparking plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, oiling system, prime the fuel system, ignition system, cooling system, inlet system, described cylinder body (44) is the cylinder body (44) at the scavenging road junction (45) containing left and right each on the cylinder chamber of dress piston of two-cycle gasoline engine centrally symmetrically, it is characterized in that: on the scavenging road junction (45) of the left and right each of the symmetry of described cylinder body (44), about each symmetrical ground, each ground is provided with oblique wedge turbulent flow time and alters sheet (46), block waste gas and return in order to producing turbulent flow at scavenging road junction place and alter to reduce discharge.

Tool half balance drift angle and the wing blade LPG engine of para-curve a grass-mowing machine, containing cylinder body, and known combustion chamber, sparking plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, oiling system, prime the fuel system, ignition system, cooling system, inlet system, described cylinder body (44) is the cylinder body (44) at the scavenging road junction (45) containing left and right each on the cylinder chamber of dress piston of two-cycle gasoline engine centrally symmetrically, it is characterized in that: on the scavenging road junction (45) of the left and right each of the symmetry of described cylinder body (44), about each symmetrical ground, each ground is provided with oblique wedge turbulent flow time and alters sheet (46), its main body is pressure angle close to a section of the equal logarithmic spiral by logarithmic differentiation equation, the feature utilizing the logarithmic spiral tool pressure angle of higher mathematics equal, the turbulent flow added is made to return one section that alters that sheet has logarithmic spiral, then gush mixed air-flow thereon just easily steadily, produce turbulent flow in order to utilizing equal pressure angle at scavenging road junction place and return alter to reduce discharge to block waste gas.

The oblique wedge turbulent flow getting tool half balance drift angle and para-curve wing blade LPG engine returns a section of the main body altering sheet,

Set up differential equation d ��/d ��=k ��:

If polar equation ��=�� (��), because wanting pressure angle �� equal everywhere, therefore tg ��=constant, makes tg ��=k,

By pressure angle formula tg ��=�� '/��,

Just there is �� '/��=k,

Differential it, just have differential equation d ��/d ��=k ��.

Solve d ��/d ��=k ��, both sides integration after variables separation:

�� d ��/��=�� kd ��, because of �� > 0, is easy to get:

Ln ��=k ��+C,

Also it is exactly:

A wherein is constant, is determine by workpiece and the size of mould and the starting condition of CNC machine.

Adopt PRO/ENGINEERWILDFIRE mapping software, newly establish working directory, newly-built part,

Set up parameter (PARAMETER) 1:C real number (realnumber), can follow according to concrete operating mode assignment between 0.01-1, such as 0.3; C is also referred to as wave height.

Set up parameter (PARAMETER) 2:N integer (integer), can follow according to concrete operating mode choosing value between 2-100, such as 13; N is also referred to as wave number.

Opening relationships (RELATION), namely the equation of the present invention is:

Logarithmic curve:

Z=0

X=10*t

Y=log (10*t+0.0001)

Make logarithmic curve;

Again then, adopt and rotate, merge, the instructions such as entity, and assemble with workpiece and merge, get final product modeling;

Again with described equation and the modeling of PRO/ENGINEERWILDFIRE institute, input CNC processes center, with CIMATRO or MASTCAM, and the steel mould of superzapping cast aluminium alloy, or auxiliary with milling machine, planer and electrical spark working work; When using electrospark machining, input CNC with described equation and process center, then first to be made tungsten copper electrode, with the lathe having three-dimensional rotation head, then produce in batches with pressure die-casting machine; Machining again; Or it is welded on skirt of piston with the sheet of another system. Logarithmic curve cam, middle rank work should.

The overshoot convergence ripple of the gibbs phenomenon of the overshoot of the continuous transition of square wave of the Fourier function in the Method of Mathematical Physics of reference higher mathematics and reference lag theorem, displacement theorem, the frequency spectrum decayed gradually that convolution theorem and being approximately of launching by the approximate single circular frequency of Fourier function copy fourier series to draw multiple from diminishing greatly from the close peak ripple of thin change, what mathematics physics was described should be the high level overview of many actual phenomenons, engine blow-through air turbulent motion rule also should not make an exception and surmount completely, also some should be had similar or inherent relevant or bring out the best in each other and ought more or less use for reference it, on the shaping mould mould core of transfer mold, manufacture the transition flex point (54j) imitating the top close to described Fourier function breach (53j) relevant with the inherence seemed and high-wall have at least one close to 90 degree turn round shape its be approximately gibbs overshoot restrain ripple with namely imitating fourier series gibbs overshoot phenomenon draw approach rectangle transition ripple gradually and be approximately having of the frequency spectrum decayed gradually that imitative fourier series draws multiple from the fluctuating convex-concave (54k) from the close peak ripple of thin change that diminishes greatly, so that shaping cylinder body Idiotype body affects air-flow such as mainstay. have imitative higher mathematics function and Fourier person's movements and expression the frequency spectrum decayed gradually having the transition flex point (54j) on guiding and Fourier function breach (53j) of damping characteristic and the top of high-wall and imitative fourier series to draw having fair line characteristic have multiple comprehensively noise high frequency band, pressure are raised from diminishing greatly from the fluctuating convex-concave (54k) of the close peak ripple of thin change more favourable than, compression ratio.

With reference to the quadratic function curve shape of the equipotentiality streamline of the family of parabolas in the Method of Mathematical Physics of higher mathematics, the flow direction of many gas storage of layering gas storage piston there is directive significance. CNC digital control processing, by the equipotentiality streamline of the side family of parabolas of scavenging duct, can be used in the outside of described envelope high-wall (44e). The advantage that a section of scavenging duct logarithmic spiral also can use its tool pressure angle of CNC digital control processing, logarithmic spiral and equiangular spiral equal everywhere, is conducive to the air motion of scavenging duct. Two scavenging duct interworkings, first its tool pressure angle of scavenging road junction equiangular spiral is equal everywhere, and the quadratic function curve shape of the equipotentiality streamline of the 2nd scavenging road junction family of parabolas, the Method of Mathematical Physics of the imitative higher mathematics in scavenging road junction is R&D direction, should be better than blindly gathering together with the test of high number scientific guidance. What mathematics physics was described should be the high level overview of many actual phenomenons, and engine blow-through air rule also should not make an exception.

The tool of described LPG grass-mowing machine half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, filter screen (58) in described scavenging passage is located at described technique butt strip (55) side, the described filter screen in scavenging passage becomes through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder; Anti-filter screen of making an uproar in scavenging passage is provided with multiple point and splits (11b), and it is multiple hollow six prismatics that described point is split, and top has aperture, and the advanced point of air-flow splits compression, then splits aperture effusion expansion from point, having anti-making an uproar to filter regulation and control and noise elimination effect; The scavenging passage on technique butt strip (55) side is provided with catalyst volume (59) of reduction of discharging, it is containing platinum rhodium indium iridium, catalyst effect and anti-filtration regulating and controlling effect of making an uproar is had to flowing through gas, the regular hour is had to postpone difference and isolation and noise elimination effect and obstruct regulating effect, the ingenious discharge slowing down pneumatic noise and HC.

The tool updated half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, the gas storage pit (31a) of ad hoc left and right each outside its piston, its summary of described gas storage pit is in pyriform, there is concentric reducer, less near wrist pin axle bed place, it is bigger away from wrist pin axle bed place, the crosscut section line (31b) of described gas storage pit is curve, the thickness of the section of the crosscut section line (31b) of described gas storage pit is greater than 2mm, the curve of the crosscut section line (31b) of described gas storage pit is the equipotentiality streamline of family of parabolas, one section of its streamline is the quadratic function of the family of parabolas of the analytical function of the harmonic function meeting Laplace equation of the flow function imitating Method of Mathematical Physics, be conducive to gas storage scavenging. the equipotentiality streamline of family of parabolas and tool logarithmic spiral there is imitative higher mathematics function have fair line and guiding and damping characteristic, comprehensively noise high frequency band, pressure are raised than, to compress when layered scavenging favourable. the upper top of the 2nd scavenging side wall (55d) of described technique butt strip (55) is that the quadratic function curve of family of parabolas is so that the outside with described envelope high-wall (44e) forms the 2nd scavenging road junction by the quadratic function curve shape coexistence of the equipotentiality streamline of the family of parabolas of the side of scavenging duct. or curve family of parabolas and logarithmic spiral use instead. the outside that the upper top of the 2nd scavenging side wall (55d) of technique butt strip (55) is curve itself and the described envelope high-wall (44e) of tool logarithmic spiral equipotentiality streamline forms the 2nd scavenging road junction by the curved shape coexistence of the logarithmic spiral equipotentiality streamline of the side of scavenging duct. or curve family of parabolas equipotentiality streamline, or family of parabolas and logarithmic spiral join use. join with being: the outside that the upper top of the first scavenging side wall (55d) of described technique butt strip (55) is curve itself and the described envelope high-wall (44e) of logarithmic spiral equipotentiality streamline forms the first scavenging road junction by the curved shape coexistence of the logarithmic spiral equipotentiality streamline of the side of scavenging duct, meanwhile, the outside that the upper top of the 2nd scavenging side wall (55d) of described technique butt strip (55) is quadratic function curve itself and the described envelope high-wall (44e) of family of parabolas forms the 2nd scavenging road junction in the hope of comprehensively to the guide guide effect of gas storage scavenging by the quadratic function curve shape coexistence of the equipotentiality streamline of the family of parabolas of the side of scavenging duct.

Update perfect described tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, it is characterized in that: described cylinder body (44) is provided with multiple reinforcements heat radiation in flakes (44x, 44v) between its multiple radiator element; And described cylinder body (44) is provided with through heat radiation hole (44j) in the cross-sectional direction of venting port; And be also provided with straight-through heat radiation hole (44k) in the cross-sectional direction of the inlet mouth of described cylinder body (44), therefore often there is improvement in the place of ignoring people.

The present invention relates to energy-saving and emission-reduction, be tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, its cylinder body (44) is containing ventage (44a), enter gas port (44b), the each symmetry in left and right enter air mouth (44c), first scavenging port (44d) of each symmetry in left and right, 2nd scavenging port (44f) of each symmetry in left and right, namely the outside of the envelope high-wall closed does not depend on piston cylinder to lean on the side of scavenging duct to be curved shape, and the technique butt strip (55) with the outer portion at the scavenging road junction of cylinder body coexists, technique butt strip (55) is containing interval stupefied (55g), interval breach (55e), first scavenging side wall (55d), 2nd scavenging side wall (55d), three mounting hole site and abnormity envelope pad, and it is formed with the scavenging road junction of cavity, piston (31) is provided with the gas storage pit (31a) of each around. the equipotentiality streamline of family of parabolas and tool logarithmic spiral have imitative higher mathematics function have fair line and guiding and damping characteristic comprehensively noise high frequency band, pressure are raised than, to compress when layered scavenging favourable.

Tool half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, its feature is, the present invention is near piston upper dead point, before the ignition of mixed gas of piston upper compressed in cylinder, owing to piston skirt pendulum portion moving, the preparation suction opening in opening and closing cylinder is opened, in the crankcase below piston, suck the gas mixture of fuel and air, the pressure of the combustion gases of the piston upper produced due to igniting again, piston moves from upper dead point to bottom dead centre direction and closes suction opening simultaneously, gas mixture in compression crankcase, at the piston upper of bottom dead center-nearby, make the combustion gases in cylinder to while outdoor gas is discharged from opening and closing venting port, the scavenge air belt being connected with cylinder by crankcase, imports to the double stroke engine in cylinder by preparation scavenging port in piston upper opening and closing cylinder by gas mixture from crankcase, the design has the valve gear synchronous with bent axle, and this valve is that the crankcase side of scavenge air belt is configured to normally closed from crankcase to cylinder scavenging mouth, when the valve of the crankcase side of scavenge air belt is closed, gas mixture in scavenge air belt makes it, by the flame of burning gas, burning of igniting, HC reduces later again from crankcase to scavenging port, the crankcase side of scavenge air belt makes it opening, while the burning gas mixture of scavenge air belt is sent, gas mixture in crankcase closes venting port before being discharged from venting port, and this is exactly the double stroke engine discharging significantly minimizing making HC, solve in former structure, and the valve of above-mentioned bent axle same period is not because being designed. the words that after the flame disappearance of combustion gases, scavenging port is not also opened, the flame of combustion gases can make the gas mixture ignition in scavenge air belt and crankcase, gas mixture cannot be supplied in cylinder, the opening of venting port will make the opening of scavenging port cross early stage unlatching, venting port in cylinder and scavenging port while opening time, unburn gas mixture in crankcase and in scavenge air belt enters in cylinder from venting port, so a part for gas mixture is discharged from venting port under unburned state, become the problem that the gas mixture in Exhaust Gas (i.e. HC) increases, the present invention is outside described suction opening venting port scavenging port, after crank case scavenging, crankcase side at scavenge air belt has added opening and closing valve, gas mixture in scavenge air belt is ignited in the flame of burning gas and is burnt, and be that the valve of synchronizing cycle can be truncated according to bent axle in scavenge air belt and crankcase, so the gas mixture in crankcase can not burn, simultaneously the burning gas in scavenge air belt with the valve openings of bent axle synchronizing cycle in, gas mixture in crankcase can be extruded out in cylinder, venting port and scavenging port simultaneously opening time initial stage, combustion gases in scavenge air belt are fed in cylinder, can not be adulterated in the exhaust gas being discharged from venting port to outside HC, when venting port is about to close, the unburn gas mixture continued in crankcase in spent gas mixture in scavenge air belt is fed in cylinder, so the HC amount of doping in exhaust gas can control to reduce. described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), described C type circle has a segment opening, when a segment opening of described C type circle is with crankshaft rotation, and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, thus form the gasoline engine of tool single cylinder half balance and the wing blade of para-curve mean line.

The described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve grass-mowing machine, it is characterized in that, described have the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the gap (56 ��) between the oral area of the connection crankcase of the scavenging passage of the cylinder of the external diameter distance engine 1E39F of the outer circle of described C type circle is at 0.02-0.08 millimeter; It is further characterized in that, described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 82-93 degree.

Usefulness of the present invention: be near piston upper dead point, before the ignition of mixed gas of piston upper compressed in cylinder, owing to piston skirt pendulum portion moving, the preparation suction opening in opening and closing cylinder is opened, in the crankcase below piston, suck the gas mixture of fuel and air; Its effect exhaust HC is measured reduce; Add two screen cloth at scavenging passage to hold concurrently scavenging oral area cushion valve.

Design key is that piston moves from upper dead point to bottom dead centre direction and closes suction opening simultaneously, and namely in piston length and cylinder, gas port distance matches, and this contemplates just is not difficult to arrive at figure subscript, and processing also is not difficult to accomplish, and its effect exhaust HC is measured reduce.

The described of the tool half balance drift angle improved and the grass-mowing machine of para-curve wing blade LPG engine has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, when its segment opening dual-side have the side at oblique angle with crankshaft rotation, just form shear flow when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder and reduce the effect that sudden change impacts, thus the tool single cylinder half described in being formed balances and the gasoline engine of the wing blade of para-curve mean line.

The grass-mowing machine of the described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve is characterized in that, described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the gap (566) between the oral area of the connection crankcase of the scavenging passage of the cylinder of the external diameter distance engine 1E34F of the outer circle of described C type circle is at 0.01-0.06 millimeter; Described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 79-97 degree; Described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is that the segment opening with described C type circle (56a) adding crank valve (56) matches.

Improve the grass-mowing machine of perfect described tool half balance drift angle and the wing blade LPG engine of para-curve further, it is characterized in that, described have the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is corresponding with a segment opening of described C type circle (56a) adding crank valve (56) and passes through a pilot hole, or a steady brace, or what locating sleeve realized coordinating, and fix with three screws.

Improve the grass-mowing machine of perfect described tool half balance drift angle and the wing blade LPG engine of para-curve further, it is characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, the angle of the axis of its every limit bent axle of oblique angle that the dual-side of one segment opening of the oblique wedge circle (56b) of the C type circle of described crank valve (56) is provided with is at 5-27.5 degree, when described C type circle oblique wedge circle (56b) a segment opening dual-side have the side at oblique angle with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, just form shear flow and the slow effect fallen sudden change and impact.

The grass-mowing machine of the described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described have the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the pressure circle (56f) of logarithm line, when the logarithmic spiral side of dual-side of a segment opening of described pressure circle is with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, the logarithmic spiral of mineralization pressure angle properties equivalent everywhere is affected to the effect of air-flow and buffering.

The tool half balance drift angle of innovation brush cutter and the grass-mowing machine of the wing blade LPG engine of para-curve, have reduction of discharging effect, and its filter screen (58) is located at technique butt strip (55) side, and under separately having filter screen (58) to be located at scavenging passage, the filter screen of scavenging passage becomes through knitting device by the 50 many wire of order, described filter screen in scavenging passage has filteration, what be located under scavenging passage described separately has filter screen and screen cloth to hold concurrently scavenging oral area cushion valve, and two screen cloth and filter screen all have regulating and controlling effect to breathing between gas and crankcase in cylinder. it is characterized in that, the innovation is near piston upper dead point, before the ignition of mixed gas of piston upper compressed in cylinder, owing to piston skirt pendulum portion moving, the preparation suction opening in opening and closing cylinder is opened, in the crankcase below piston, suck the gas mixture of fuel and air, the pressure of the combustion gases of the piston upper produced due to igniting again, piston moves from upper dead point to bottom dead centre direction and closes suction opening simultaneously, gas mixture in compression crankcase, at the piston upper of bottom dead center-nearby, make the combustion gases in cylinder to while outdoor gas is discharged from opening and closing venting port, the scavenge air belt being connected with cylinder by crankcase, imports to the double stroke engine in cylinder by preparation scavenging port in piston upper opening and closing cylinder by gas mixture from crankcase, the design has the valve gear synchronous with bent axle, and this valve is that the crankcase side of scavenge air belt is configured to normally closed from crankcase to cylinder scavenging mouth, when the valve of the crankcase side of scavenge air belt is closed, gas mixture in scavenge air belt makes it, by the flame of burning gas, burning of igniting, HC reduces later again from crankcase to scavenging port, the crankcase side of scavenge air belt makes it opening, while the burning gas mixture of scavenge air belt is sent, gas mixture in crankcase closes venting port before being discharged from venting port, and this is exactly the double stroke engine discharging significantly minimizing making HC, solve in former structure, with the valve of above-mentioned bent axle same period because not being designed, the words that after the flame disappearance of combustion gases, scavenging port is not also opened, the flame of combustion gases can make the gas mixture ignition in scavenge air belt and crankcase, gas mixture cannot be supplied in cylinder, the opening of venting port will make the opening of scavenging port cross early stage unlatching, venting port in cylinder and scavenging port while opening time, unburn gas mixture in crankcase and in scavenge air belt enters in cylinder from venting port, so a part for gas mixture is discharged from venting port under unburned state, become the problem that the gas mixture in Exhaust Gas (i.e. HC) increases, the present invention is outside described suction opening venting port scavenging port, after crank case scavenging, crankcase side at scavenge air belt has added opening and closing valve, gas mixture in scavenge air belt is ignited in the flame of burning gas and is burnt, and be that the valve of synchronizing cycle can be truncated according to bent axle in scavenge air belt and crankcase, so the gas mixture in crankcase can not burn, simultaneously the burning gas in scavenge air belt with the valve openings of bent axle synchronizing cycle in, gas mixture in crankcase can be extruded out in cylinder, venting port and scavenging port simultaneously opening time initial stage, combustion gases in scavenge air belt are fed in cylinder, can not be adulterated in the exhaust gas being discharged from venting port to outside HC, when venting port is about to close, the unburn gas mixture continued in crankcase in spent gas mixture in scavenge air belt is fed in cylinder, so the HC amount of doping in exhaust gas can control to reduce,Described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), C type circle has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, when it has the side at oblique angle with crankshaft rotation, just form the effect sheared and reduce sudden change and impact when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder; The grass-mowing machine of described tool half balance drift angle and the wing blade LPG engine of para-curve, it is further characterized in that, described has the valve gear synchronous with bent axle, it it is the pressure circle (56f) that the dual-side of a segment opening of C type circle (56a) adding crank valve (56) on bent axle (57) is provided with oblique angle, when the logarithmic spiral side of dual-side of a segment opening of described pressure circle is with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, the logarithmic spiral of mineralization pressure angle properties equivalent everywhere is affected to the effect of air-flow and buffering; The point of the filter screen (58) in scavenging passage is split (11b) and is located at described technique butt strip (55) side; The scavenging passage on described technique butt strip (55) side is provided with catalyst volume (59) of reduction of discharging, containing platinum rhodium steel iridium, catalyst effect and anti-filtration regulating and controlling effect of making an uproar is had to flowing through gas, there is regular hour difference and isolate and noise elimination regulating effect, slow down the discharge of HC to the venting port of scavenging passage, thus it is formed in the engine adding catalyst in scavenging passage; Improve the grass-mowing machine of perfect tool half balance drift angle and the wing blade LPG engine of para-curve further, it is characterized in that, described have the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the gap (56 ��) between the oral area of the connection crankcase of the scavenging passage of the cylinder of the external diameter distance engine 1E45F of the outer circle of described C type circle is at 0.02-0.07 millimeter; It is further characterized in that, described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 82-92 degree.

The grass-mowing machine of the described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, it contains the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 83-89 degree.

The grass-mowing machine of the described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is that the segment opening with described C type circle (56a) adding crank valve (56) matches; Compression ratio is not more than 11.

The grass-mowing machine of the described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is that the segment opening with described C type circle (56a) adding crank valve (56) matches.

The gasoline engine of the described tool single cylinder of further Improvement and perfection half balance and the wing blade of para-curve mean line, it is characterized in that, described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is corresponding with a segment opening of described C type circle (56a) adding crank valve (56) and passes through a pilot hole, or a steady brace, or what locating sleeve realized coordinating, and fix with three screws.

The grass-mowing machine of the described tool of further Improvement and perfection half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, when described C type circle a segment opening dual-side have the side at oblique angle with crankshaft rotation, just form shear flow when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder and reduce the effect that sudden change impacts. the angle of the axis of its every limit bent axle of oblique angle that the dual-side of one segment opening of oblique wedge circle (56b) is provided with is at 5-27.5 degree, it is further characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the pressure circle (56f) at oblique angle, when the logarithmic spiral side of dual-side of a segment opening of described pressure circle is with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, the logarithmic spiral of mineralization pressure angle properties equivalent everywhere is affected to the effect of air-flow and buffering, it is further characterized in that, filter screen (58) in described scavenging passage is located at described technique butt strip (55) side, the described filter screen in scavenging passage becomes through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder, the point of the anti-filter screen of making an uproar in scavenging passage is split (11b) and is located at described technique butt strip (55) side, the ingenious discharge of HC to the venting port of scavenging passage slowing down crankcase virgin gas.

It is new technology using on brush cutter and mower by Computer Numerical Simulation blade aerodynamic force noise analysis.

Also the method for computer numerical secondary analog aerodynamic force noise analysis on probation, uses LMSVirtuallab software, is easy to learn and use, and analyzes noise source, and acquirement noise data falls makes an uproar, the method analyzed by computer aided animation aerodynamic force, the aerodynamic force noise analysis of blade when the rotation of engine is exported idle running, simulate with CFD (computationalfluiddynamics), its method is intended to be undertaken " numerical experiment " by computer, reappears physical process from point of theory, the cost that has of numerical simulation is low, data easily obtain in the hope of receiving compared with experiment, problem analyzed from point of theory advantage and along with the development of computer and model, computation period constantly reduces, effect that calculation result is more and more accurate, flow field and field of turbulent flow to gardens machine carry out feasibility analysis and data analysis, blade and the mowing runner of determining gardens machine are sound source, being simulated by the noise of gardens machine, the simulation of trend for noise change is as far as possible realistic, makes every effort to noise value and experimental error about 5%, noise source and eddy noise are set to the disengaging that turbulent boundary layer inner fluid acts on interact between blade and fluid micellar generation and eddy current, the change that continuous spectrum random noise is set to flow state is to outlet flow pattern modulation and effluent fluid and ambient atmos effect generation, rotation noise is set to fluid and stator and the surrounding fluid effect generation that blade drives, experimental data and noise spectrum and show the noise of different frequency field can be relevant, mower blade rotary air kinetics noise fundamental frequency calculation formula: F=NZ/60, F is noise fundamental frequency, N is rotating speed of flail, Z is blade number, doing progress flow process: geometric model is set up, computer simulation, with experimental result contrast, change structure is simulated, and sets up noise model, experimental verification according to simulation result, way is started with from blade geometry and air channel geometry and rotating speed of flail, set up air channel and blade cad model, unstrctured grid ICEM generates, calculate by FLUENT fluid data and rotate fluid calculation MRF model in machinery, consider variable velocity field and pressure field and tubulence energy, use LMSVirtuallab software, obtain noise spectrum, analyzing noise source, acquirement noise data falls makes an uproar, stable state tentative calculation optimum configurations: grid is 4120000 unstrctured grid and dynamic mesh INTERFACE, and turbulence model is RANS (K-EPSILON), and blade rotational speed gets 3000 revs/min, and iterative steps gets 1000, the trial result has vorticity figure, pressure cloud atlas, speed vector figure, three-dimensional flow line chart, pressure contour(ed)surface figure and plane flow line chart, the trial result also has blade cad model to generate unstrctured grid, show that important computations result is that engine gardens machine cutter speed noise when 5700-7000 rev/min is low, the gardens machine by Computer Numerical Simulation aerodynamic force noise analysis of the method for described a kind of computer numerical secondary analog aerodynamic force noise analysis be further characterized in that its blade rotational speed be every minute 5790 to 6999 turns, with 1E18 to 1E58F type engine.

Update and the grass-mowing machine of perfect tool half balance drift angle and the wing blade LPG engine of para-curve, it is drive gardens machines; Fuel gas tank is with LPG fuel gas tank, containing miniature propane fuel tank, the front portion of miniature propane fuel tank (t20) is provided with gas thread, described fuel enters engine and work by tube stub through mixed airgun controller, and the front portion of described miniature propane fuel tank is also provided with safety valve to overflow when exceeding limit and to play safety effect; So the tank diameter of described miniature propane fuel tank is little 98 millimeters, it is convenient to change by standard containing propane fuel 465 grams. Filter screen in scavenging passage is located at described technique butt strip side, and under the filter screen in described scavenging passage is located at scavenging passage; It is the two coarse filtration combination thin filter cushion valve chamber become through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder; Two coarse filtration combination thin filter cushion valve chamber that many wire become through knitting device is also provided with the catalyst volume of reduction of discharging, and it, containing platinum, rhodium, indium, has catalyst effect to slow down the discharge of pneumatic noise and HC to flowing through gas. The gasoline engine of tool single cylinder half balance and the wing blade of para-curve mean line, it is characterized in that: the described sourdine containing catalyst hush tube (69) always becomes (F7) to be arranged on described double stroke engine by described sourdine pad (F8), described sourdine always becomes the exit of (F7), it is provided with the inner outlet (F7C2) of interior metal cover (F7C1) nearby, outer again, it is provided with outer outlet (F7j2) and the logarithm runner (F7j3) of outer resin cover (F7j1) at a distance, it is convenient to double-deck cooling eliminate the noise, does not scald staff and security.

Update and the grass-mowing machine of perfect tool half balance drift angle and the wing blade LPG engine of para-curve, it is drive gardens machines; If with combustion gas, it is furnished with LPG fuel gas tank, containing miniature propane fuel tank, the front portion of miniature propane fuel tank (t20) is provided with gas thread, described fuel enters engine and work by tube stub through mixed airgun controller, and the front portion of described miniature propane fuel tank is also provided with safety valve to overflow when exceeding limit and to play safety effect; The tank diameter of described miniature propane fuel tank is less than 100 millimeters, containing propane fuel 465 grams, is convenient to change by standard. Filter screen in scavenging passage is located at described technique butt strip side, and under the filter screen in described scavenging passage is located at scavenging passage; It is the two coarse filtration combination thin filter cushion valve chamber become through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder; Two coarse filtration combination thin filter cushion valve chamber that many wire become through knitting device is also provided with the catalyst volume of reduction of discharging, and it, containing platinum, rhodium, indium, has catalyst effect to slow down the discharge of pneumatic noise and HC to flowing through gas. Sourdine containing catalyst hush tube (69) always becomes (F7) to be arranged on described double stroke LPG engine by described sourdine pad (F8), described sourdine always becomes the exit of (F7), it is provided with the inner outlet (F7C2) of interior metal cover (F7C1) nearby, outer again, it is provided with outer outlet (F7j2) and the logarithm runner (F7j3) of outer resin cover (F7j1) at a distance, it is convenient to double-deck cooling eliminate the noise, does not scald staff and security. Magnetic flywheel improvement tapering, at 10-20 degree, with the wing blade having para-curve axis equation, forms the grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve. The former tapering of magnetic flywheel is six calibration, is 9.527283381 degree, has and axially channels bit. Magnetic flywheel improvement tapering is greater than 10 degree, and with three points of taperings, axis channels bit and not easily crooked. Adopt and have the wing blade of para-curve axis equation, have the parabolical axis equation to be: quadratic equation

The die module making aerofoil cross section skeletal lines in production just can criticize product.

The outer end of blade is most advanced and sophisticated, and has cutting edge, is beneficial to excision twister and is beneficial to and smoothly gives vent to anger and reduce disorderly eddy current.

The grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, the sourdine containing catalyst hush tube (69) described in it always becomes (F7) to be arranged on described two-cycle gasoline engine by described sourdine pad (F8), described sourdine always becomes the exit of (F7), it is provided with the inner outlet (F7C2) of interior metal cover (F7C1), outer again, outer outlet (F7j2) and the logarithm runner (F7j3) being provided with outer resin cover (F7j1), so that double-deck cooling is eliminated the noise. Scavenging passage establishes filter screen, and under separately having filter screen to be located at scavenging passage; There is filtration regulating and controlling effect; Also it is provided with catalyst. It is convenient to double-deck cooling eliminate the noise, does not scald staff and security. Solve the former tapering of magnetic flywheel and have the problem axially altered. When being designed with the cross-sectional shape of wing blade of para-curve mean line equation, key is to determine the equation of the arc of blade; Getting bending angle is 18 degree, and chord length b is 20, a/b=0.45; A is the maximum defluxion point on string bow; The parabolical general equation of the true origin of substitution cartesian geometry just can solve and obtain. Middle rank technician can make the die module of aerofoil cross section skeletal lines. The outer end of described blade is most advanced and sophisticated, is beneficial to and smoothly gives vent to anger and reduce disorderly eddy current, and have cutting edge, is beneficial to excision twister. Updating and perfect double stroke engine improves the quality of gardens machine, solving the former tapering of magnetic flywheel has the problem axially altered, improves leaf quality, improves single cylinder half balance. LPG engine, can join with the miniature LPG propane fuel tank t20 of standard, and it is convenient to assembling containing the base holes t20d of tank base disk t20c and tank base disk t20c. The dual-side of the opening adding C type circle (56a) of crank valve (56) on its bent axle (57) has balance drift angle (��) between point angle line and the bent axle center of circle to the center line in the big end center of circle of the central angle in the bent axle center of circle, at 2 to 22 degree, improve single cylinder half balance. Cutting unit is provided with the outer protective cover (73) being contained on interior shield cap (60) and is provided with its roller length on its outer protective cover and equals to beat the grass the long grass pressing wheel (74) of diameter, so that pressure grass soil moisture conservation and meadow decorative pattern; Moving head (54) contained by described cutting unit with cut buttress beat the grass wire (54b) be provided with multiple point sword (54a) its multiple point sword way be cut to pile up neatly under hammering with sharp flat engraving tool on wire.

Claims

1. the grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, for gardens machine, always become containing stock, cutting unit, manipulating handgrip, described stock is containing aluminum pipe, it is provided with transmission shaft in the cavity that described aluminum pipe inside is provided with, engine and engine are equipped with in described aluminum pipe and its upper end of transmission shaft, and described aluminum pipe and its lower end of transmission shaft are equiped with described cutting unit, and the middle part of described aluminum pipe is equiped with hand handle, described gardens machine its containing described two-cycle gasoline engine and engine (1), interior hexagonal cylindrical head screw M6x30 (2), interior hexagonal cylindrical head screw M5x8 (3), 3 l type hex-nut M6 (4), PP wire clamp (5), PA suspension ring (6), 4 l type non-metallic insert hexagonal set nut M5 (7), POM suspension ring permanent seat (8), interior hexagonal cylindrical head screw M5x20 (9), before connect aluminum pipe (10), manipulating handgrip always becomes (11), control handle pipe (12), hexagonal cylindrical head screw M5x25 (13) in 13 band spring washers, hand is permanent seat train wheel bridge (14), hand is permanent seat (15), left hand handle component (16), paracril hand is shock-absorbing sleeve (17), hand is permanent seat lower plate (18), left handle pipe (19), five leaf nylon tubesTransmission shaftDeep groove ball bearing III (22), spring washer 6 (23), interior hexagonal cylindrical head screw M6x23 (24), aluminium tube joint (25), locking knob (26), transmission shaft joint (27), rear aluminum pipe 4 interior hexagonal cylindricals head screw M5x12 (29), 4 spring washers 5 (30), spacing handle spring (31), spacing handle lock (32), spacing handle (33), opening back-up ring 2.5 (34), shield cap permanent seat (35), circlip for hole 26 (36), axle elasticity back-up ring 10 (37), small arc-shaped gear (38), small arc-shaped gear oil blocks up (39), interior hexagonal cylindrical head screw M6x14 (40), interior hexagonal cylindrical head screw M6x10 (41), plain washer 6 (42), wheel casing (43), great circle arc gear (44), splined shaft (45), deep groove ball bearing 6002I (46), circlip for hole 32 (47), wheel casing guard shield (48), spline pad (49), disc cutterbar is containing 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or 4 tooth disc cutterbars (64) or 8 tooth disc cutterbars (65), cutterhead pressing plate (51), cutterhead guard shield (52), l type hex-nut M10 left-handed (53), or nylon moving head (54), braces (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross groove coiled hair tapping screw ST4x14 (59), shield cap A (60), shielding support (61), interior hexagonal cylindrical head screw M5x35 (62), left hand is (16-1), l type hex-head nut M5 (16-2), cross groove coiled hair screw M5x20 (16-3), cross groove coiled hair screw M5x30 (16-4), there is the waistband (66) of pallet (67), assist and turn ball (68), catalyst hush tube (69), described LPG engine (1), with 1E39F, single cylinder and 39 cylinder diameters and air-cooled, it always becomes (F1) containing starter, start driver plate assembly (F2), 2 oil sealings (F3), right case (F4), 2 deep groove ball bearing II (F5), flat pad combination screw M5 �� 45 (F6) of hexagonal cylindrical head in 2 moment of torsion 7-9NM, sourdine containing catalyst hush tube (69) always becomes (F7), sourdine pad (F8), the right vibration damping cover (F9) of fuel tank, 2 retaining ring for piston pins (F10), wrist pin (F11), needle bearing (F12), piston (g31), piston ring (F14), crank shaft complement (F15), woodruff-key (F16), cylinder body pad (F17), cylinder body (F18), 2 interior hexagonal cylindrical head groups close screw M5 �� 20 (F19), engine enclosure (F20), coiled hair tapping screw ST5 �� 14 (F21), lighter for ignition always becomes (F22), 2 crosses fluting combination screw M4 �� 20 (F23), sparking plug (F24), without paronite mould assembling pad (F25), 2 mould assembling steady braces (F26), left box body (F27), 5 crosses fluting combination screw M5 �� 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch plate (F31), axle is with elasticity back-up ring (F32), the left shock-absorbing sleeve L (F33) of fuel tank, the right shock-absorbing sleeve R (F34) of fuel tank, inserts bearing connection seat (F35), 3 crosses fluting combination screw M5 �� 20 (F36), train wheel bridge shock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38), train wheel bridge (F39), lower plate (F40), 2 interior hexagonal cylindrical head groups close screw M5 �� 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 air filters seat lining (F44), soft matter polyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 spring washers (F47), 2 crosses fluting coiled hair bullet screw M5 �� 63 (F48), air filter lid (F49), cross fluting coiled hair combination screw M5 �� 14 (F50), 2 air inlet pipe pads (F51), flow deflector (F52), polyphenylene sulfide PPS inlet pipe (F53), grounding wire component (F54), without paronite carburettor pad (F55), carburetor assembly (F56), PU yellow transparent used oil pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter assembly (F60), oil pipe folder (F61), HDPE blowing fuel tank (F62), fuel tank cap assembly (F63), flat pad combination M6X14 (F64) of 5-7NM hexagonal head bolt, 4 3-5NM crosses fluting combination screw M5X18 (F65), its double stroke LPG engine comprised of described grass-mowing machine, by described interior hexagonal cylindrical head screw M6x30 (2), interior hexagonal cylindrical head screw M5x8 (3), and 3 l type hex-nut M6 (4), with described before connect aluminum pipe (10) and be connected, connect the outside of the pipe of aluminum pipe (10) before described, by described PP wire clamp (5), PA suspension ring (6), 4 l type non-metallic insert hexagonal set nut M5 (7), POM suspension ring permanent seat (8), interior hexagonal cylindrical head screw M5x20 (9) and form braces part with braces (55), braces is worn on single shoulder, connect on aluminum pipe (10) before described, it is equiped with manipulating handgrip always to become (11), hexagonal cylindrical head screw M5x25 (13), hand in control handle pipe (12), many band spring washers, permanent seat train wheel bridge (14), hand is made up of shock-absorbing sleeve (17), hand permanent seat (15), left hand handle component (16), paracril hand permanent seat lower plate (18), left handle pipe (19) jointly, connect the inside of the pipe of aluminum pipe (10) before described, it is equiped with five described leaf nylon tubesTransmission shaftAnd deep groove ball bearing III (22) is so that transmission, connect aluminum pipe (10) before described to be connected with described rear aluminum pipe (28) by described spring washer 6 (23), interior hexagonal cylindrical head screw M6x23 (24), aluminium tube joint (25), locking knob (26), transmission shaft joint (27), and by 4 interior hexagonal cylindricals head screw M5x12 (29), 4 spring washers 5 (30), spacing handle spring (31), spacing handle lock (32), spacing handle (33), opening back-up ring 2.5 (34) and form spacing Handleset, in the end of described rear aluminum pipe (28), it is equiped with described shield cap permanent seat (35), circlip for hole 26 (36), axle elasticity back-up ring 10 (37), small arc-shaped gear (38), small arc-shaped gear oil blocks up (39), and hexagonal cylindrical head screw M5x25 (13) in many band spring washers, interior hexagonal cylindrical head screw M6x14 (40), interior hexagonal cylindrical head screw M6x10 (41), plain washer 6 (42), and wheel casing (43), great circle arc gear (44), splined shaft (45), deep groove ball bearing 6002 (46), circlip for hole 32 (47), wheel casing guard shield (48), spline pad (49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead guard shield (52), described cutting unit contains shield cap and moving head and disc cutterbar to select, fill the described l type hex-nut M10 left-handed (53) of cutterhead, or dress nylon moving head (54) is to replace disc cutterbar, and the small blade (57) that cut-out is beaten the grass described in line, it is contained on described shield cap A (60) by hexagon nut with flange M5 (56), knife rest (58), cross groove coiled hair tapping screw ST4x14 (59), and shielding support (61) and interior hexagonal cylindrical head screw M5x35 (62) to be installed, cutterhead can select more, or 2 tooth disc cutterbars (63), or 4 tooth disc cutterbars (64), or 8 tooth disc cutterbars (65), so that the shrub of different varieties is cut in choosing, described left hand handle component (16), left hand, (16-1), l type hex-head nut M5 (16-2), cross groove coiled hair screw M5x20 (16-3), cross groove coiled hair screw M5x30 (16-4) are made up of, it are arranged in left handle pipe (19), and have the waistband (66) of pallet (67), people's waist can be tied up to, pallet (67) turns ball (68) movable contact with auxiliary, auxiliary turn ball (68) and is connected with engine enclosure (F20), to lengthen cut coverage further, catalyst hush tube (69), connects the air outlet that sourdine always becomes (F7), so that waste gas is discharged near cutter through aluminum pipe, the engine starting part of described double stroke LPG engine comprises starter and always becomes (F1), starts driver plate assembly (F2), be furnished with 2 oil sealing (F3) and 2 deep groove ball bearing II (F5), to be contained on the described right case (F4) of engine rotationally, by flat pad combination screw M5 �� 45 (F6) of hexagonal cylindrical head in 2 moment of torsion 7-9NM, sourdine containing catalyst hush tube (69) is always become (F7) and sourdine pad (F8), is fixed on cylinder body (F18), cylinder body (F18) is equipped with the right vibration damping cover (F9) of fuel tank, at cylinder body (F18) built with 2 retaining ring for piston pins (F10), wrist pin (F11), needle bearing (F12), piston (F13), piston ring (F14) and crank shaft complement (F15), bent axle is established woodruff-key (F16), cylinder body pad (F17) is mounted on cylinder body (F18), 2 interior hexagonal cylindrical head groups conjunction screw M5 �� 20 (F19) and coiled hair tapping screw ST5 �� 14 (F21) are fixed on engine enclosure (F20) on cylinder body (F18), lighter for ignition always becomes (F22) to be fixed by 2 crosses fluting combination screw M4 �� 20 (F23), sparking plug (F24) is also contained on cylinder body (F18), cylinder body (F18) is put without paronite mould assembling pad (F25), 2 mould assembling steady braces (F26), and fix left box bodies (F27) with 5 crosses fluting combination screw M5 �� 25 (F28), magnetic flywheel (F29) is contained on bent axle, and matches with clutch assembly (F30), clutch plate (F31) and axle elasticity back-up ring (F32), fuel tank left shock-absorbing sleeve L (F33) and fuel tank right shock-absorbing sleeve R (F34) are contained on described outer cover (20), inserts bearing connection seat (F35) is fixed by 3 crosses fluting combination screw M5 �� 20 (F36), described connection seat (F35) is equipped with train wheel bridge shock-absorbing sleeve (F37), lower plate shock-absorbing sleeve (F38) and train wheel bridge (F39) lower plate (F40) and closes screw M5 �� 18 (F41) by 2 interior hexagonal cylindrical head groups and clamp, described connection seat (F35) is also equipped with flame-out wire clamp (F42), air filter seat (F43), 2 air filters seat lining (F44), soft matter polyurethane foam filter core (F45), air filter pressing plates (F46) are formed air filter by 2 M5 spring washers (F47) and 2 crosses fluting coiled hair bullet screw M5 �� 63 (F48) air filter lid (F49), crosses fluting coiled hair combination screw M5 �� 14 (F50), and are packed on carburettor, 2 air inlet pipe pads (F51), flow deflector (F52), polyphenylene sulfide PPS inlet pipe (F53), grounding wire components (F54), form carburettor without paronite carburettor pad (F55), carburetor assembly (F56), PU yellow transparent used oil pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter assembly (F60), oil pipe folder (F61), HDPE blowing fuel tank (F62), fuel tank cap assembly (F63) form fuel tank, and flat pad combination M6X14 (F64) of 5-7NM hexagonal head bolt is fixing described startup driver plate assembly (F2), as 4 3-5NM crosses fluting combination screw M5X18 (F65) be fixing described starter always become (F1), the described waistband (66) of pallet (67) that has is provided with pallet (67), pallet (67) can be placed assist and turn ball (68), and auxiliary turn ball (68) and be contained in external engine, or directly brush cutter engine is placed on the pallet (67) that waistband (66) is provided with comes up operation, pallet (67) turns ball (68) movable contact with auxiliary, auxiliary turn ball (68) and is connected with engine enclosure (F20), to lengthen cut coverage further, catalyst hush tube (69), the air outlet that sourdine always becomes (F7) is connected in its one end, connects aluminum pipe before another termination, so that waste gas aluminum pipe after described, and discharge near cutter, described catalyst hush tube (69) is aluminium system, has waste gas by there to be aluminium dioxide catalyst effect, described sourdine always becomes (F7) to be aluminium system, has waste gas by just there being aluminium dioxide catalyst effect, connect aluminum pipe (10) before described and rear aluminum pipe (28) separates, have waste gas by there to be aluminium dioxide catalyst effect, foam honeycomb body established by five leaf nylon tubes in aluminum pipe in the rear, and adds catalyst catalyzer at foam honeycomb body, so as to have waste gas by time have catalyst multiple catalyzing effect, 2 described tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) are for selecting, the disc cutterbar being commonly referred to as cutting unit, it is provided with multiple outer cutting edge (641) in cutterhead periphery, so that brush allows cutter less, described 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65), it is provided with multiple inner cutter hole (642) in cutterhead periphery, so that card branch in brush, in described carburetor assembly (F56), the interior straight pipe (70) improving oil nozzle, for there being the vortex spray bar of spiral slot (71), is beneficial to disperse mixed effect, in described carburetor assembly (F56), improve the interior straight pipe (70) of oil nozzle or have the import of the vortex spray bar of spiral slot (71) for there being parabolical hydraucone (72), or two conic sections are such as the hydraucone of archimedes curve, it is beneficial to polymerization contaminated product effect, in described left handle pipe (19), it is provided with damping adapter (19b) of close circle whisker shape, so that damping further, adopt and have shield cap (60) that is transparent or partially transparent, operate in order to convenient observation brush, the grass-mowing machine of the single-cylinder air-cooled tool of small two-stroke that this grass-mowing machine adopts half balance drift angle and the wing blade LPG engine of para-curve, belong to the engine of low emission, be oil engine improvement have function wave combustion chamber and with have active receiving electrode and fine motion electric discharge pole oil engine portfire collocation basis on, and reduce on the basis of the petrol engine of hydrocarbon emission in Jia Shuanfu shirt rim, skirt of piston, and alter on the petrol engine basis falling row at logarithmic differentiation isogonal line shirt rim, the skirt of piston turbulent flow time improved, the two auxiliary ventage narrowing left and right block improved further reduces the two of discharge and rushes petrol engine, in Jia Shuanfu shirt rim, skirt of piston, have and reduce discharging effect up to standard, logarithmic differentiation isogonal line shirt rim, skirt of piston turbulent flow returns and alters the petrol engine falling row is be equipped with two auxiliary shirt rim (g3 in the skirt section of piston (g31)

Near piston upper dead point, before the ignition of mixed gas of piston upper compressed in cylinder, owing to piston skirt pendulum portion moving, the preparation suction opening in opening and closing cylinder is opened, in the crankcase below piston, suck the gas mixture of fuel and air, the pressure of the combustion gases of the piston upper produced due to igniting again, piston moves from upper dead point to bottom dead centre direction and closes suction opening simultaneously, gas mixture in compression crankcase, at the piston upper of bottom dead center-nearby, make the combustion gases in cylinder to while outdoor gas is discharged from opening and closing venting port, the scavenge air belt being connected with cylinder by crankcase, imports to the double stroke engine in cylinder by preparation scavenging port in piston upper opening and closing cylinder by gas mixture from crankcase, the design has the valve gear synchronous with bent axle, and this valve is that the crankcase side of scavenge air belt is configured to normally closed from crankcase to cylinder scavenging mouth, when the valve of the crankcase side of scavenge air belt is closed, gas mixture in scavenge air belt makes it, by the flame of burning gas, burning of igniting, HC reduces later again from crankcase to scavenging port, the crankcase side of scavenge air belt makes it opening, while the burning gas mixture of scavenge air belt is sent, gas mixture in crankcase closes venting port before being discharged from venting port, and this is exactly the double stroke engine discharging significantly minimizing making HC, solve in former structure, with the valve of above-mentioned bent axle same period because not being designed, the words that after the flame disappearance of combustion gases, scavenging port is not also opened, the flame of combustion gases can make the gas mixture ignition in scavenge air belt and crankcase, gas mixture cannot be supplied in cylinder, the opening of venting port will make the opening of scavenging port cross early stage unlatching, venting port in cylinder and scavenging port while opening time, unburn gas mixture in crankcase and in scavenge air belt enters in cylinder from venting port, so a part for gas mixture is discharged from venting port under unburned state, become the problem that the gas mixture in Exhaust Gas (i.e. HC) increases, the present invention is outside described suction opening venting port scavenging port, after crank case scavenging, crankcase side at scavenge air belt has added opening and closing valve, gas mixture in scavenge air belt is ignited in the flame of burning gas and is burnt, and be that the valve of synchronizing cycle can be truncated according to bent axle in scavenge air belt and crankcase, so the gas mixture in crankcase can not burn, simultaneously the burning gas in scavenge air belt with the valve openings of bent axle synchronizing cycle in, gas mixture in crankcase can be extruded out in cylinder, venting port and scavenging port simultaneously opening time initial stage, combustion gases in scavenge air belt are fed in cylinder, can not be adulterated in the exhaust gas being discharged from venting port to outside HC, when venting port is about to close, the unburn gas mixture continued in crankcase in spent gas mixture in scavenge air belt is fed in cylinder, so the HC amount of doping in exhaust gas can control to reduce, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle. when its segment opening dual-side have the side at oblique angle with crankshaft rotation, just have shearing when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder and reduce the effect impacted, the gasoline engine of described tool single cylinder half balance and the wing blade of para-curve mean line, it has the valve gear synchronous with bent axle containing described, it it is the pressure circle (56f) that the dual-side of a segment opening of C type circle (56a) adding crank valve (56) on bent axle (57) is provided with logarithm, when the logarithmic spiral side of dual-side of a segment opening of described pressure circle is with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, the logarithmic spiral of mineralization pressure angle properties equivalent everywhere is affected to the effect of air-flow and buffering, the point of the anti-filter screen of making an uproar in scavenging passage is split (11b) and is located at described technique butt strip (55) side, the scavenging passage on described technique butt strip (55) side is provided with reduction of discharging catalyst volume (59) its containing platinum rhodium indium iridium, catalyst effect and anti-filtration regulating and controlling effect of making an uproar is had to flowing through gas, there is regular hour difference and isolate and noise elimination regulating effect, slow down the discharge of HC to the venting port of scavenging passage, thus it is formed in the engine adding filter screen in scavenging passage,

The gasoline engine of tool single cylinder half balance and the wing blade of para-curve mean line, there are reduction of discharging effect and effect up to standard, filter screen (58) in its scavenging passage is located at technique butt strip (55) side, and under separately having filter screen (58) to be located at scavenging passage, the filter screen of scavenging passage becomes through knitting device by many wire, described filter screen in scavenging passage has filteration, what be located under scavenging passage described separately has filter screen and screen cloth to hold concurrently scavenging oral area cushion valve, and two screen cloth and filter screen all have regulating and controlling effect to breathing between gas and crankcase in cylinder, the grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, adopt the aerodynamic force noise analysis to blade during two-cycle gasoline engine idling, simulate with CFD (computationalfluiddynamics), its method is intended to be undertaken " numerical experiment " by computer, reappears physical process from point of theory, the cost that has of numerical simulation is low, data easily obtain in the hope of receiving compared with experiment, problem analyzed from point of theory advantage and along with the development of computer and model, computation period constantly reduces, effect that calculation result is more and more accurate, flow field and field of turbulent flow to brush cutter carry out feasibility analysis and data analysis, blade and the cutting groove of determining brush cutter are sound source, being simulated by the noise of brush cutter, the simulation of trend for noise change is as far as possible realistic, makes every effort to noise value and experimental error about 10%, noise source and eddy noise are set to the disengaging that turbulent boundary layer inner fluid acts on interact between blade and fluid micellar generation and eddy current, the change that continuous spectrum random noise is set to flow state is to outlet flow pattern modulation and effluent fluid and ambient atmos effect generation, rotation noise is set to fluid and stator and the surrounding fluid effect generation that blade drives, experimental data and noise spectrum and show the noise of different frequency field can be relevant, blade of brush cutter rotary air kinetics noise fundamental frequency calculation formula: F=NZ/60, F is noise fundamental frequency, N is rotating speed of flail, Z is blade number, doing progress flow process: geometric model is set up, computer simulation, with experimental result contrast, change structure is simulated, and sets up noise model, experimental verification according to simulation result, way is started with from blade geometry and air channel geometry and rotating speed of flail, set up cutting and blade cad model, unstrctured grid ICEM generates, calculate by FLUENT fluid data and rotate fluid calculation MRF model in machinery, consider variable velocity field and pressure field and tubulence energy, use LMSVirtuallab software, obtain noise spectrum, analyzing noise source, acquirement noise data falls makes an uproar, stable state tentative calculation optimum configurations: grid is 4120000 unstrctured grid and dynamic mesh INTERFACE, and turbulence model is RANS (K-EPSILON), and blade rotational speed gets 3000 revs/min, and iterative steps gets 1000, the trial result has vorticity figure, pressure cloud atlas, speed vector figure, three-dimensional flow line chart, pressure contour(ed)surface figure and plane flow line chart, the trial result also has blade cad model to generate unstrctured grid, show that important computations result is that engine bush knife speed noise when 5700-7000 rev/min is low, its economic speed of grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve be every minute 5790 to 6990 turns,

Filter screen (58) in its scavenging passage is 80 object coarse strainers; And separately to have filter screen (58) to be located under scavenging passage be hold concurrently scavenging oral area cushion valve by the 180 thin filter screens of object; The grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve, its described magnetic flywheel tapering adopted is 19.92464442 degree, adopt and have the wing blade of para-curve axis equation, described wing blade have parabolical axis equation to be quadratic equation:

X²+2.63XY+1.73Y²-20X+105Y=0;

The die module making aerofoil cross section skeletal lines in production just can criticize product; When being designed with the cross-sectional shape of wing blade of para-curve axis equation, key is to determine the equation of the arc of its blade; Getting bending angle is 18 degree, and chord length b is 20, a/b=0.45; A is the maximum defluxion point on string bow; The parabolical general equation of the true origin of substitution cartesian geometry just can solve and obtain;

Middle rank technician makes the die module of aerofoil cross section skeletal lines; The outer end of described blade is most advanced and sophisticated, is beneficial to and smoothly gives vent to anger and reduce disorderly eddy current, and have cutting edge, is beneficial to excision twister; The grass-mowing machine of tool half balance drift angle and the wing blade LPG engine of para-curve is characterized in that, the dual-side of the opening adding C type circle (56a) of crank valve (56) on its bent axle (57) has balance drift angle (��) between point angle line and the bent axle center of circle to the center line in the big end center of circle of the central angle in the bent axle center of circle, at 2 to 22 degree.

2. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve is characterized in that, it contains the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the gap (566) between the oral area of the connection crankcase of the scavenging passage of the cylinder of the external diameter distance engine 1E37F of the outer circle of described C type circle is at 0.02-0.07 millimeter; It is further characterized in that, described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 82-92 degree.

3. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, it contains the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, the dual-side of a segment opening of described C type circle to the central angle in the bent axle center of circle at 84-88 degree.

4. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is that the segment opening with described C type circle (56a) adding crank valve (56) matches; Compression ratio is not more than 12.

5. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, adding the rotation of C type circle (56a) of crank valve (56) on bent axle (57) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is corresponding with a segment opening of described C type circle (56a) adding crank valve (56) and realizes coordinating by a pilot hole.

6. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, bent axle (57) adds the rotation of C type circle (56a) of crank valve (56) and the oral area of the connection crankcase of the scavenging passage of opening and closing cylinder is formed, described bent axle (57) is provided with C type edge (57a), and it is corresponding with a segment opening of described C type circle (56a) adding crank valve (56) and passes through a steady brace, or a locating sleeve realizes coordinating, and fix with three screws.

7. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the pressure circle (56f) at oblique angle, when the logarithmic spiral side of dual-side of a segment opening of described pressure circle is with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, the logarithmic spiral of mineralization pressure angle properties equivalent everywhere is affected to the effect of air-flow and buffering.

8. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, when described C type circle a segment opening dual-side have the side at oblique angle with crankshaft rotation, just form shear flow when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder and reduce the effect that sudden change impacts.

9. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, described has the valve gear synchronous with bent axle, it is C type circle (56a) adding crank valve (56) on bent axle (57), the C type circle of described crank valve (56) has the dual-side of a segment opening to be set to have the oblique wedge circle (56b) at oblique angle, the angle of the axis of the oblique angle that the dual-side of one segment opening of the oblique wedge circle (56b) of the C type circle of described crank valve (56) is provided with and every limit bent axle is at 15-27 degree, when described C type circle oblique wedge circle (56b) a segment opening dual-side have the side at oblique angle with crankshaft rotation, when the oral area of connection crankcase of the scavenging passage of opening and closing cylinder, just form shear flow and the slow effect fallen sudden change and impact.

10. the grass-mowing machine of tool according to claim 1 half balance drift angle and the wing blade LPG engine of para-curve, it is characterized in that, filter screen (58) in described scavenging passage is located at described technique butt strip (55) side, and under the filter screen (58) in described scavenging passage is located at scavenging passage, or set up, or all establish; The described filter screen in scavenging passage is the two coarse filtration combination thin filter cushion valve chamber become through knitting device by many wire, has filtration regulating and controlling effect to breathing between gas and crankcase in cylinder; Two coarse filtration combination thin filter cushion valve chamber that many wire become through knitting device is provided with catalyst volume (59) of reduction of discharging, it is containing platinum, rhodium, indium, catalyst effect and anti-filtration regulating and controlling effect of making an uproar is had to flowing through gas, the regular hour is had to postpone difference and isolation and eliminate the noise and obstruct regulating effect, the ingenious discharge slowing down pneumatic noise and HC.