CN105605081A

CN105605081A - Engine crankshaft

Info

Publication number: CN105605081A
Application number: CN201610156014.1A
Authority: CN
Inventors: 蔡建龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-03-18
Filing date: 2016-03-18
Publication date: 2016-05-25

Abstract

The invention relates to an engine crankshaft which comprises a first crank, a second crank and a connection rod, wherein an eccentric cam sleeves the large end of the connecting rod; the first crank, the second crank and the eccentric cam are connected through crankshaft pins in a matched manner; the first crank is a stepped cylinder; a crank gear with inner teeth is arranged at the periphery of a small cylinder on the outer side and is fastened on a crankshaft box body on the same side; a semicircular boss is arranged on the inner side of the first crank; two layers of gears are arranged in the boss; teeth on one side of the two layers of gears are meshed with the teeth of the eccentric cam, and teeth on the other side of the two layers of gears penetrate through a through hole formed in the periphery of the crank so as to be meshed with the teeth of the crank gear. The engine crankshaft is simple in structure, low in cost and high in reliability; by the use of an extremely small number of parts, a compression ratio of an engine cannot be wasted, and the structure of the engine body of the engine is not required to be greatly changed.

Description

A kind of engine crankshaft

Technical field

The present invention relates to engine art, is a kind of engine crankshaft mechanism specifically.

Background technology

Engine crankshaft is the main rotary gadget of engine, loads onto after connecting rod, and upper and lower (back and forth) motion that can accept connecting rod becomes and followsRing (rotation) motion. Bent axle is the important parts on engine, and its material is made up of carbon structural steels or spheroidal graphite cast-iron,There are two significant points: trunnion, rod journal, (also having other). Trunnion is installed on cylinder body, connecting rod neck and connecting rodBig end hole connects, and connecting rod small end hole is connected with steam-cylinder piston, is a typical slider-crank mechanism. The lubricated of bent axle is mainlyLubricating of lubricated and two fixing point of finger and big end bearing shell and crank-shaft link neck, the rotation of bent axle is the power source of engine,Also be the driving source of whole mechanical system.

The compression ratio of cylinder has considerable influence to the performance of explosive motor. Compression ratio is exactly that engine mixed gas body is pressedThe degree of contracting, keeps stable and suitable compression ratio just can make the running of engine be able to smooth-going and stable. Compression ratio and enginePerformance has much relations, and the engine of high compression ratio just means to have larger power output. Conventionally, guaranteeing engineIn cylinder, do not occur under the prerequisite of pinking, the raising compression ratio of trying one's best, is conducive to the raising of engine performance. Crank mechanism at presentHave cylinder piston igniting time, piston moves down with the skew of bent axle, under change waste compression ratio, kinetic equation loss is large, leadsCause the shortcoming of too low efficiency of combustion.

The Patents that improves at present compression ratio technique is a lot, and technological approaches also has a variety of, as combustion chamber completion method, variable workOn plug, many link rod methods, gear type connecting rod, piston pin, arrange on the rod journal of accentric support cover, bent axle, add accentric support, canMobile cylinder head method and oscillating cylinder cover method etc. But realize raising compression ratio function and labour-saving document by changing crank structureFewer.

Summary of the invention

The object of the invention is to propose a kind of simple in structure, reliability is high, low cost of manufacture, can directly be applied in existingIn motivation, and just can solve without engine body structure being carried out to too large change the compression ratio that available engine spark delay bringsLoss problem.

Engine crankshaft of the present invention mainly comprises: the first crank, the second crank, connecting rod, described big end is set with eccentric protrudingWheel, the needed eccentricity value of eccentric cam can, by the stroke of engine piston, calculate and make when bent axle deflection 10 is spent, biasThe rotation of cam plays a part to change big end movement locus, and the bent axle eccentric cam that turns around also synchronously turns around and just can driveBig end translation on the track of original big end motion. Described the first crank, the second crank and eccentric cam pass through bent axlePin is connected, and described the first crank is ladder cylinder, and the small cylinder periphery in outside is provided with the crank gear with internal tooth,Crank gear is anchored on the crankcase of homonymy, on the first crank inner side, has a semi-circular boss. In boss, be provided with double-layer gear,The tooth of double-layer gear one side and the tooth engagement fit of eccentric cam, the tooth of double-layer gear opposite side is logical through what arrange in crank peripheryThe tooth engagement fit of hole and crank gear, plays a part to determine eccentric cam direction of rotation and adjusting rotary speed. Utilize bent axle to rotateIn time, makes the double-layer gear arranging on crank and is fastened on the crank gear tooth engagement fit on crankcase, and eccentric on drivening rodThe rotation of cam, the bent axle eccentric cam that circles circles, and when bent axle up time rotation 10 is spent, piston is positive top dead centre, makes it intoFor correct timed ignition truly.

Described semi-circular boss is fixed on crank with bolt

Described double-layer gear is fixed on crank with pin.

Operation principle of the present invention is:

Crankshaft eccentric cam turns over certain angle, and the axial location of bent axle changes, and the position of piston top dead center changes thereupon,The center deflection of eccentric cam, the telescopic scope of big end also becomes greatly, does man-hour corresponding also more laborsaving.

The invention has the beneficial effects as follows:

1. with respect to current other engine crankshaft mechanism, of the present invention simple in structure, cost is low, and reliability is high, with fewParts realize and do not waste the compression ratio of engine, and do not need engine body structure to carry out larger change.

2. the telescopic scope of big end also becomes greatly, and motor head can pass out more high pulling torque, does man-hour corresponding also more laborsaving,Vibrate littlely, engine efficiency is higher.

3. strengthen ignition advance angle and ensure that piston, at the abundant all burnt of top dead centre, discharges more environmental protection.

Brief description of the drawings

Fig. 1 is cross-sectional view of the present invention;

Fig. 2 is structural representation of the present invention;

Fig. 3 is gear mesh schematic representation of the present invention;

In figure: the first crank-1, the second crank-2, connecting rod-3, big end-4, eccentric cam-5, tooth 51, crankpin-6,Small cylinder-7, crank gear-8, internal tooth-81, bent axle-9, semi-circular boss 10, double-layer gear 11, tooth-111, tooth-112,Pin-12, through hole-13, needle bearing-14, bolt hole-15.

Detailed description of the invention

Further illustrate the present invention below in conjunction with accompanying drawing. It should be noted that, in this description, not limit the present invention to attachedExemplary embodiment in figure, and covered various replacements within the scope of the present invention by described in claims,Amendment, equivalents.

As long as adopted the improvement that method of the present invention is conceived and technical scheme is carried out or be directly used in other occasion without improvement, allWithin the scope of protection of the invention.

As shown in Figure 1, Figure 2, Figure 3 shows, engine crankshaft of the present invention comprises the first crank 1, the second crank 2, connecting rod 3, instituteState big end 4 and be set with eccentric cam 5, described the first crank 1, the second crank 2 are joined by crankpin 6 with eccentric cam 5Close connection, needle bearing 14 is set on crankpin 6, between big end 4 and eccentric cam, be also provided with needle bearing, eccentric protrudingTake turns 5 rotatably, described the first crank 1 is ladder cylinder, in small cylinder 7 peripheries in outside, is combined with the song with internal tooth 81Handle gear 8, crank gear 8 is provided with bolt hole 15, and crank gear 8 use bolts are fixed on the main spindle box of homonymy (in figure notIllustrate), there is a semi-circular boss 10 the first crank 1 inner side, and semi-circular boss 10 use bolts are fixed on crank 1, in boss 10Be provided with double-layer gear 11, double-layer gear 11 use pins 12 are fixed on the first crank 1, and pin 12 is outside equipped with needle roller axleHold, double-layer gear 11 can rotate, the tooth 111 of double-layer gear one side and tooth 51 engagement fit of eccentric cam, the first crank1 periphery is also provided with through hole 13, and the tooth of double-layer gear opposite side 112 engages through the tooth 81 of this through hole 13 and crank gearCoordinate, crank 1 rotates a circle, and drives double-layer gear 11 to rotate, and double-layer gear 11 rotarily drives eccentric cam 5 and rotates a circle.In the present embodiment, the setting of needle bearing is the level and smooth rotation that realizes gear. In addition, according to present embodiment, forThe lubricated structure building block that comprises needle bearing etc. is equipped with oilhole.

The present invention adds gear by the architecture advances that eccentric cam and crank are set on connecting rod, keeps bent axle deflection when piston igniting-15 ° of left and right, 10 ° of crankshaft center positions, cam revolves while turning around the position can compensation link major part moving down and does not waste compressionRatio, fuel-efficient laborsaving, increase engine efficiency.

The present invention is not restricted to the embodiment of description, and in the case of not deviating from the scope of claims, Ke YizuoGo out many other change and amendment or conversion.

Claims

1. an engine crankshaft, is characterized in that: comprise the first crank, the second crank and connecting rod, described big end is set with partiallyCardiac prominence wheel, described the first crank, the second crank and eccentric cam are connected by crankpin; Described the first crank is ladder circleCylinder, the small cylinder periphery in outside is provided with the crank gear with internal tooth, and crank gear is anchored on the crankcase of homonymy,On the first crank inner side, there is a semi-circular boss, in boss, be provided with double-layer gear, the tooth of double-layer gear one side and the tooth of eccentric camEngagement fit, the tooth of double-layer gear opposite side is through the through hole arranging in crank periphery and the tooth engagement fit of crank gear.

2. engine crankshaft according to claim 1, is characterized in that: described semi-circular boss bolt is fixed on the first crank.

3. engine crankshaft according to claim 1, is characterized in that: described double-layer gear pin is fixed on crank.