CN1181460A - Improved fuel injection system for multi-cylinder internal combustion engine - Google Patents

Abstract

A fuel injection system for a multi-cylinder internal combustion engine comprising a body in which a fuel chamber communicates with a chamber port, dosing means for selectively delivering fuel to the fuel chamber, a bore in the body communicating between the chamber port and the exterior of the body, valve means comprising a valve member having a valve stem for selectively opening and closing the bore, electromagnetic means in the body connected to the valve stem for moving the valve stem to an open or closed position of the bore, gas supply means for supplying fuel from the fuel chamber to the bore when the bore is open, the valve stem extending from the chamber port to the fuel chamber by the electromagnetic means, the chamber port communicating with the fuel chamber through a passageway in the valve stem so that fuel from the fuel chamber is delivered through the valve stem passageway and the chamber port and through the opening.

Description

Improved fuel system for multi-cylinder internal combustion engine

The present invention relates to the fuel injection system of multi-cylinder engine, the fuel injection system of the fuel injection system of this multi-cylinder engine can a certain amount of fuel mix gas (being suitable for combustion-supporting gas as air etc.) and be injected in the cylinder of each internal-combustion engine.

The quantitative fuel that is mixed with gas is injected in the internal-combustion engine, and the pressure of that part of gas of sneaking into is enough to make fuel directly to spray in cylinder or the gas handling system by a valve control mouth, inhaled air then enters in the cylinder by gas handling system, and above-mentioned technology is known.The quota of fuel of this form and course of injection need provide fuel and gas for quota of fuel and the ejecting system corresponding to each cylinder of motor.

When design quota of fuel and ejecting system, also to consider the factor in many working procedure, as the weight of the fuel supply control valve of band valve rod.Because the dynamic load of valve and bounce-back all are the key factors that influences the fuel feeding accuracy.Equally, quantitative fuel also can exert an influence to the variation of fuel delivery between each circulation of motor to the moistening degree of tube wall, and influences the reaction that motor changes quota of fuel.

The fuel injection system that the purpose of this invention is to provide a kind of multi-cylinder engine, it has, and a plurality of volumes are little, the fuel injection system of compact structure, a fuel injection system of this fuel system for multi-cylinder internal combustion engine is to a cylinder injection fuel of this multi-cylinder engine, make it its operating process and satisfy modern motor to reliability, the requirement in precision and life-span.

For this reason, a kind of fuel system for multi-cylinder internal combustion engine is provided, this fuel system for multi-cylinder internal combustion engine comprises: the vertical single piece of rigidity, make air supply pipe in the described single piece and supplied fuel pipe, described pipe air supply pipe and the described fuel pipe that supplies are suitable for being connected to source of the gas and fuel source respectively, each described pipe extends along described unitarily formed longitudinal direction, each cylinder of described internal-combustion engine has at least one quota of fuel and injection apparatus, described quota of fuel and injection apparatus engage with described single piece, it is characterized in that, described quota of fuel and injection apparatus comprise a fuel dosing device and a fuel injection system, described fuel dosing device is suitable for carrying quantitative fuel to described fuel injection system, described fuel dosing device directly is communicated with fuel source, in feasible the use, fuel cycle is by each fuel dosing device, each quota of fuel and injection apparatus comprise the fuel cavity of a corresponding setting in this single piece, and between described air supply pipe and described fuel injection system, form fixing connected relation, each described fuel cavity is positioned to accept the described quantitative fuel from corresponding described fuel dosing device, and each described fuel injection system optionally is communicated with a corresponding cylinder of described internal-combustion engine, so that fuel is transported in the described cylinder, thereby when described fuel injection system is communicated with the cylinder of described internal-combustion engine, from the gas flow of described air supply pipe by described chamber and described fuel injection system, so that carry and carry described quantitative fuel in the cylinder of described internal-combustion engine.

The fuel injection system of multi-cylinder engine of the present invention comprises:

An apparatus for delivering fuel to internal combustion engine, it comprises: a body wherein has the fuel cavity that is communicated with the spout inner chamber; Transfer the fuel is to the proportioning device of fuel cavity selectively; The intrinsic spout that between this spout inner chamber and body exterior, is communicated with; Valving comprises a valve member, and this valve member is suitable for and this spout concerted action, so that open and close this spout selectively, and a valve rod that is contained on this valve member is arranged; The calutron that can handle selectively in this body, this calutron operably are connected on this valve rod, this valve rod is moved so that open or close this spout; Air feeder, it is in order to open so that give the fuel cavity air feed during to spout fuel supplying that this opens wide from fuel cavity at this spout at least; This valve rod extends to this fuel cavity from this spout inner chamber by this calutron, and passage that the spout inner chamber is communicated with fuel cavity by this valve rod makes the fuel of fuel cavity be transported to by valve stem passage and spout inner chamber and by this spout.

Calutron preferably adopts solenoid valve.This solenoid valve has a coil concentric with valve rod, and the armature coaxial with it is housed on valve rod.Armature preferably along or be in the annular space that is between coil and the valve rod basically.Valve rod is preferably tubular, and an end is being fixed valve member, and fuel can flow into from another opening end.Joint, valve member end is between the inwall of tubular valve rod and inner chamber.Connect like this, a large amount of fuel just can not be closed in the following part in the tubular valve rod and inner chamber joint, nor can flow in the inner chamber.Fuel preferably directly is injected in the firing chamber of motor by body apertures.

Above-mentioned structure brings many advantages can for the working procedure of the fuel injection system with this fuel delivery means.(as the tubular valve rod is available) allows fuel flow through from the passage in the valve rod, can reduce the surface area that can influence fuel.Fuel, sprays in the motor to the body outlet more thus from quantitative.Existing structure is then by an annular pass, and this point is particularly different.Fuel to surface moistening can influence the response delay amount, this retardation be present in the variation of quota of fuel place oil-supply speed and bring thus fuel is sprayed into motor between the variation of the oil yielding rate at spout place.In each oil spout circulation, along with the variation of fuel supply rate, the oil slick thickness that adheres on the surface area that quantitatively fuel is flowed through between place and the outlet port also can change.If, comprise that total fuel quantity of the variation of oil slick thickness also can reduce so the surface area that contacts with fuel has reduced.This advantage embodies can accelerating from the reaction time of motor, also is reflected in because the unstability that the variation of the fuel quantity that sprays between each circulation of motor causes has reduced.

Adopt electromagnetic valve device also can bring benefit.Prior art constructions is that the quota of fuel place is between solenoid valve and fuel delivery port, and the present invention then is at the fuel delivery port and quantitatively between the place electromagnetic valve component is set.The length of valve rod has shortened like this, thereby valve rod weight saving, natural frequency are reduced, and then the number of times that may rebound when having reduced valve closing.When high engine load is worked, the considerable fuel valve rod of will flowing through, this can produce good cooling effect just when the solenoid valve heating value is very high.

Equally, the electromagnetism valve member is arranged on fuel to be entered the fuel delivery port of motor and quantitatively reaches the profile that solenoid valve adopts symmetry between the place, can make fuel injection system or its part put into engine cylinder cover inside, thereby reduce the total height after motor and the fuel delivery means combination.This locations of structures can also lean on the heat from cylinder cap that fuel is heated up, and helps fuel atomization.

The above-mentioned burner oil that is used for directly falls the individual cylinder that fuel is injected into multicylinder engine to the main application of the device of internal-combustion engine, as is widely used on the motor vehicle.

Consider the factor of cost of production aspect, normally only finish the fuel in the fuel tank is delivered in each fuel injection system, and then oil return is sent back to the fuel tank from each injection apparatus through suitable return tube with a pump.In order to reduce cost, usually be only to control the air feed that is transported to fuel injection system and the pressure difference between the confession fuel with a pressure governor.Adopting this structure is must cause between fuel injection system and petrolift, need to be connected with many fuel pipes between fuel injection system and the pressure governor, and this obviously can increase cost of production.Should be noted that fuel and gas tube will have suitable end-fitting in this structure, often be threaded on these joints,, and provide threaded complementary component fuel injection system, petrolift and pressure governor so that the joint can prevent to leak effectively.The production of a plurality of threaded pieces and assembling are another factors that influences cost, and the assembling of a large amount of fuel and gas piping also can increase cost, also can influence the clean and tidy of device appearance simultaneously.

Use a large amount of fuel and gas piping also can bring operational problem.Plastic tube is resilient, so the cross section of pipe can be controlled at the pressure difference between confession fuel and the gas on the specified value with regard to being difficult to like this along with managing the internal pressure variation and changing.

Under the situation of many engine application, as automobile, outboard engine peculiar to vessel, the corresponding annex of the physical dimension of motor and motor all is an important factors.Motor is limited from leaving the minimizing of size, therefore will be added in annex on the main frame and the influence that increases motor boundary dimension is remained on minimum degree just become a matter of great account.

According at present known fuel injection system in the defective aspect structure, operation and the cost, the purpose of this invention is to provide an improved fuel injection system of engin, above-mentioned defective is overcome at least in this system, thereby can obtain to operate the more efficient operation system, and also reduce the manufacture cost of this system.

According to above-mentioned viewpoint, the fuel injection system that suggestion will above be narrated is such by suggestion of the present invention, be attached to and be used for fuel system for multi-cylinder internal combustion engine, each cylinder of internal-combustion engine is equipped with a sort of fuel injection system, the vertical single piece of each fuel injection system and a single rigidity is formed whole, made in this single piece for fuel pipe and air supply pipe, these pipes should extend along this unitarily formed longitudinal direction, each fuel dosing device directly with for fuel pipe is communicated with, each fuel cavity is arranged in this single piece and with this air supply pipe and is communicated with, thereby when opened in this hole, the gas-entrained of coming from air supply pipe arrived by this valve stem passage and spout inner chamber and enters cylinder by this perforate from the fuel of this fuel cavity.

Provide fuel and gas to a plurality of fuel injection systems a kind of having in the vertical unitarily formed structure of rigidity discussed above, a respective cylinder in each fuel injection system supply multi-cylinder engine just reduces needed number for fuel pipe and air supply pipe in the installation process basically.In detail, only need to adopt one to supply all fuel injection systems from this petrolift single for fuel pipe and a single air supply pipe and get final product from this pressurized gas source.Bypassing the outward appearance of improving basically that causes owing to this structure does not say, flexible for fuel pipe and the number of air supply pipe and the minimizing of length, reduce basically since the variation in its cross section that variations of the hydrodynamic pressure in those pipes cause to the shadow of quantitative validity generation to.In addition, the number of the joint of required fuel of making and gas also reduces basically, and this minimizing of pipe joint is all contributed with the saving cost and to the zone of sewing potential in the minimizing system to some extent to conserve space.

In addition, owing to adopt the vertical single piece of rigidity that has a plurality of fuel injection systems, and each injection apparatus is corresponding to a cylinder in the multicylinder engine, therefore just can be with this vertical single piece as downward compressing member, fuel injection system is fastened on the relevant portion of each cylinder correspondence of motor, each fuel injection system have an end be seated in against this motor and in this end by corresponding scarce connection of a fuel delivery port and motor, the opposed end of each fuel injection system is received in the vertical unitarily formed corresponding recesses of rigidity, and the fixing device that each fuel injection system then is fastened between this single piece and the motor the vertical single piece of this rigidity is fixed on this motor is provided.Therefore, just need not provide the tapped hole of processing with independent in the attachment portion of each fuel injection system and each cylinder yet; Vertical integrity part is fixed on corresponding fuel injection system and the motor, also just few with the number that guarantees the needed tapped hole of work corresponding relation required between fuel injection system and motor.

Describe the present invention in detail below in conjunction with accompanying drawing, described an actual structure of using of fuel injection system of the present invention in the accompanying drawing.

Fig. 1 is a kind of shaft side figure of typical three cylinder engine, and this motor is equipped with fuel injection system of the present invention.

Fig. 2 is the viewgraph of cross-section that is contained in fuel dosing device and ejecting system place oil duct and air flue.

Fig. 3 is the axial sectional view at fuel injection system and oil, gas channel interface place.

Fig. 4 is the view along the air control ring of direction shown in the 4-4 among Fig. 2.

Fig. 5 is the sectional view that the engine cylinder cover of oil, gas passage and fuel dosing device and ejecting system is housed.

Fig. 6 is the sectional view that is contained in the pressure governor on oil, the gas passage.

Fig. 7 is the partial sectional view along direction pressure governor shown in the 7-7 among Fig. 6.

Fig. 8 is the partial sectional view that fuel and gas is input to the switching mechanism in the fuel cavity.

With reference to Fig. 1, described here is a three-cylinder two-stroke engine that adopts conventional construction basically, and it comprises cylinder body and crankcase mechanism 1, dismountable cylinder cap 2, cylinder body first gas handling system 4 and in the vent systems 5 of cylinder body opposite side.Spark plug 7 is housed on the cylinder cap 2, each spark plug corresponding respectively a cylinder.Fuel and air passageways assembly 11 roughly are installed in along on the vertical center line on cylinder cap top by bolt 8

As shown in Figure 2, fuel injection system of engin comprises the channel components 11 of a supply air and fuel.This assembly has the ejecting system 12 of a proportioning device 10 and corresponding each cylinder.Channel components 11 is elongated member, and air pipe line 13, oil feed line 14 and return line 15 are portion's longitudinal extensions within it, and these pipelines seal at an end of passage.As shown in Figure 1, a suction tude connector 9 that links to each other with air pipe line 13 is set in position, 6, one return tube connectors 3 that link to each other with return line 15 through pressure governor of the fuel supply line connector that links to each other with oil feed line 14 (pressure governor will describe in detail in the back).

Fuel dosing device 10 can have been bought on market, is not described further at this.In commercially available proportioning device, " Multec " board proportioning device of being produced by the Rochester branch company of General Motors Corporation is proper.Have filler opening 16 and oil outlet 17 on the body 18 of proportioning device 10, fuel flows to outflow thus, and metering-orifice is out that on that piece zone of 19 expressions metering-orifice is delivered to fuel in the pipeline 20 and (described in detail in the back).

The body 18 of proportioning device 10 has " O " V-shaped ring 22 between basis 18 and the hole 26 in being contained in a cross-drilled hole 26 that is formed by the outer wall 21 of channel components 11.Porose 27 on the inwall 25 between air passageways 13 and the fuel channel 14, " O " V-shaped ring 23 is also arranged between hole 27 and the body 18.The metering-orifice region 19 of proportioning device 10 is determined by pressing plate 28 corresponding to the position of passage 20.Pressing plate 28 is contained in the groove 29 of body 18, is located in position to be pressed on the end wall 21 by bolt or positioning screwn (not shown).The body 18 of proportioning device is sentenced the partition of high-precision matching relationship by passage 14 and 16 34, to reduce fuel leak therebetween.

Ejecting system 12 (as shown in Figure 3) has a housing 30, also has a cylindrical sleeve 31 on the housing 30, stretches out a spout 32 from the bottom of cylindrical sleeve, and communicates with chamber 33 in spout.Be fixed on the tubular valve rod 35 with spout 32 coefficient poppet valve element 34.Tubular valve rod 35 is contained in the inner chamber 33 by guiding rib 36, and can slide therein.Guiding rib is distributed on the circumference of valve rod 35 equally spacedly.

Housing 30 is coaxial with tubular valve rod 35, and electromagnetic coil 40 is contained in the housing 30, and between the base plate 37 and cover plate 38 of housing 30.39 as can be seen from the slit, and the electromagnet armature 41 that is installed in tubular valve rod 35 upper ends can be done limited axial motion.Spring 42 upwards promotes armature 41, to guarantee that valve member 34 can be closed spout 32 under normal state.The bottom of valve rod 35 has relative aperture 43, and the inside that this hole makes valve rod 35 always is connected with inner chamber 33.After electromagnetic coil 40 excitations, pull down armature 41, with gap 39 closures, valve rod 35 and valve member 34 produce displacement then, open spout 32.

The cover plate 38 of housing upper end is in the hole 45 of channel components 11, therefore is installed in the hole 48 that pipe 46 in the channel components 11 is arranged in armature 41 upper ends.Pipe 46 be the sealing-in of interference fit ground in the passage 20 of channel components 11, passage 20 is in wall 25, the opening of valve rod 35 upper ends sent into fuel by pipe 46 from passage 20.

One end of proportioning device 10 is 27 li in holes in the wall 25 of channel components 11, at this end an air flow control ring 75 is arranged.The annular flange dish 74 of air flow control ring 75 is sleeved on the body 18 of proportioning device.Outer surface at flange plate 74 has an annular groove 77, and this annular groove 77 communicates with passage 78, and communicates through the fuel cavity 80 of a series of aperture 79 with ring 75.As shown in Figure 4, encircling 75 1 ends has a center fuel channel 81, and its channel space is limited by lining road 82.Three support arms that equidistantly arrange 84 are fixed on lining 82 on the circumference of ring 75.The space that limits between ring 75 circumference, center bush 82 and three support arms 84 has constituted three arcuate sockets 85, flows through through this from the air of air passageways 13.

As shown in Figure 2, passage 88 is communicated with near the annular fuel chamber 80 air passageways 13 and the lining 82.Like this, just can enter the fuel cavity 80 of ring 75 by passage 88 and arcuate socket 85 from the air of air passageways 13.This a part of air can be further by near metering-orifice zone 19 in lining 82 enters into fuel channel 81.This shows, when fuel injection system is in running order, air can be flowed out by air passageways 13, around the zone 19 of quantitative mechanism 10, form radially inner air-flow, send a certain amount of fuel from zone 19, then, air continues motion vertically, enter in the passage 20 by passage 81, enter in the hollow lumen of valve rod 35 through pipe 46 again.Because some air are arranged in passage 88 is back to air passageways 13, so this motion mode of air-flow can prevent the loss of fuel.

Annular groove 77, hole 79 and passage 78 provide a runner of not throttling substantially for air from the hole 49 that air passageways 13 enters on the cover plate 38.Air can enter in the hollow valve rod 35 from hole 49, and also can flow through between the outer surface of armature 41 and sleeve 47, in space 39 enters into chamber 33.This mode of communicating in air passageways 13 and chamber 33 has guaranteed that one air-flow is arranged in chamber 33, and enough pressure is arranged, with prevent fuel from inner chamber 33 through the incoming flow of armature 41 or the savings of backflow.When this situation occurring, the quantitative accuracy of the fuel of supply engine can reduce.

Sleeve 47 leans against at outside edge, 58 places in the substrate in hole 49 of cover plate 38.The bottom of sleeve 47 is contained between the expandable part 51 of the reducing 50 of housing 30 and sleeve 31, and the lap of these three parts welds together, to form a closely knit fuel-air interface.

Said apparatus can be used on as shown in Figure 1 the sort of multi-cylinder engine.This multi-cylinder engine has fuel and air passageways assembly 11, and this assembly comprises corresponding to the fuel dosing device 10 of each cylinder and ejecting system 12.As Fig. 5, the sleeve 31 of ejecting system 12 is contained in the step hole suitable on the engine cylinder cover 2 57, and the fuel of ejection directly enters in the firing chamber in the cylinder from spout 32 like this.Seal ring 16 on the sleeve 31 is pressed on the suitable surface of cylinder cap and seals.Tight mechanism as bolt 8 and so on is fixed on channel components 11 on the cylinder cap 2.Channel components 11 is combined with ejecting system 12 like this, and ejecting system is combined with cylinder cap."O 52 in the hole 49 forms sealing between the outer rim 58 of channel components 11 and sleeve 47, to prevent producing fuel or leakage of air between channel components 11 and ejecting system 12.

As shown in Figure 5, engine cylinder has covered cooling chamber and passage 53,54 and 55 thereof, also has a spark-plug hole 56.Ejecting system 12 is contained in the step hole 52, and some is exposed to the shell of ejecting system 30 in the cooling chamber 54, so that direct cooling injection mechanism the heat that electromagnetic coil 40 produces is taken away, and caloric restriction passes to ejecting system and proportioning device from the firing chamber.

Fig. 8 has represented a kind of improvement structure to the air control ring 75 among Fig. 2.In the structure shown in this figure, sleeve 110 and fuel line 114 have replaced air control ring 74 and the lining 82 of Fig. 2.

The structure that should be noted that sleeve 110 is that a kind of of disclosed this class formation reelected.Between the hole 109 of sleeve 110 and fuel dosing device 10 is interference fit, and 111 the preferably slight press fits in the hole of channel components 11."O 112 can prevent that fuel from leaking out from oil supply gallery 14.

The spout of fuel dosing device 10 is contained in 113 places, and it faces with sleeve 110 and is the fuel line 114 of one, and quantitative like this fuel just enters in the fuel cavity 120.Fuel spray system 12 communicates with chamber 120, and the fuel in chamber 120 flows in the ejecting system 12.The structure of ejecting system 12 is identical with the structure that prior figures 2 is mentioned.

Fuel cavity 120 communicates with air passageways 13 by annular pass 122 and the curved channel therebetween 124 around hole 121, the fuel line 114.The outer wall of hole 121 and annular pass 122 is to be made of the hole that is parallel to each other on fuel dosing device of opening in advance 10 and the sleeve 110, and curved channel 124 is that the part that the partition by this two hole cuts away forms.This method that shapes remains unchanged the wall 125 between above-mentioned two holes, and extends to the lap of fuel line 114, also forms a part of conical surface simultaneously in 180 ° radian scope.Should be noted that: chamber 120, hole 121, annular pass 122 and curved channel 124 are that each proportioning device 10 and ejecting system 12 have, and oil supply gallery 14 and drainback passage 15 and air supply channel 13 also are that each proportioning device and ejecting system all have.Inclined-plane 126 can be incorporated into the fuel of coming from the face bounce-back the ejecting system 12, rather than directly allows these fuel return annular pass 122.

In use, when being in the fuel injection phase, there is one air-flow to flow out from passage 13, through hole 121, curved channel 124 and annular pass 122 enter in the chamber 120, and then 120 enter into fuel injection system 12 through the chamber, air mixing the fuel of having been sent in the chamber 120 by fuel dosing device 10 and is entered into fuel injection system 12, and again in this is injected to cylinder.

Before beginning that fuel sprayed into motor, when just also not having air-flow basically in air passageways 13 enters into chamber 120, generally not with fuel, or one of them part of fuel is injected in the chamber 120.The structure of hole 121 and passage 122 and 124 is such.The fuel that allows all have the trend the air passageways 13 that is back to from chamber 120 flows through a spiral channel.Some elaioleucites that the bounce-back of 120 walls is come from the chamber are arranged from the fuel that proportioning device 10 flows out, these elaioleucites are probably on another surface attached to chamber 120 or annular pass 122, the kinetic energy of elaioleucite has just lost like this, and/or fuel is guided to the path that can avoid its air passageways 13 that bleeds.As on annular pass 122, the effect of annular pass provides a unique import, and all fuel from chamber 120 can only enter on the path that arrives air passageways 13 from this import.

The advantage of this effect is that a stream district of not throttling is substantially arranged, and passing air in the chamber, and elaioleucite can only flow through from a very little hole in the opposite direction.

This fuel that prevents is from leaking into the method for air passageways 13 for chamber 120 in Fig. 8 for passage 20 among Fig. 2, can improve the quantitative accuracy that sprays into the motor fuel amount, thereby improve fuel efficiency for engine and discharge control level, simultaneously can also avoid fuel on air passageways, to put aside, and the problem of consequent clean air passage.

Because fuel enters into the air pressure that will overcome in the passage 20 in the chamber from proportioning device 10, this pressure is roughly the pressure in the air passageways 13, thus be necessary to adjust the pressure of fuel according to this air pressure, so that the quantitative accuracy of fuel reaches requirement.A plurality of proportioning devices and ejecting system are contained in the all-in-one-piece channel components 11, and the single pressure governor that therefore is contained in the channel components 11 will be adjusted to the pressure of all proportioning devices and ejecting system on the value that needs.

Fig. 6 is a kind of accompanying drawing of typical pressure governor.A body 61 is arranged on the pressure governor 60, fuel meat 62 and air part 63 are arranged on the body, these two-part are to be fixed together by the edge 64 that forges.Fuel meat 62 is interference fit with hole 56.The outer wall 21 of channel components 11 is passed in hole 56, also by the part of wall 74 between oil supply gallery 14 and drainback passage 15.Drainback passage 15 communicates with the center cavity of fuel meat 62 by the hole 59 on fuel meat 62 perisporiums.Between the wall of the fuel meat 62 of body 61 and channel components 11, one " O " V-shaped ring 65 is arranged.Fuel meat 62 also can partly pass the part of wall 25 between oil supply gallery 14 and air passageways 13, and the other parts that while air part 63 is passed wall 25 enter in the air passageways 13.

Diaphragm 66 of 63 two relative shaft shoulder bandings of fuel meat 62 and air part is to separate fuel and air.Under its normal working state, diaphragm can be crooked.Pre-loaded spring 67 is pressed on the pressing plate 68.Pressing plate is fastened on the diaphragm 66.The power that spring applies can be adjusted by adjusting plug 69.There is a hole at the center of adjusting plug, has in order to be communicated with the inside of air passageways 13 and air part 63.

Have a valve disc 70 on the pressing plate 68, this valve disc 70 and sleeve 71 common actions, sleeve 71 defines hole 72.Tapped hole 73 is arranged on the body 61, and oil return connector 3 is screwed into this hole, and the fuel of release just can flow back in the fuel tank.As the specific descriptions of Fig. 7, a bulb 90 that is made of one is with it arranged on the valve disc 70, this bulb places the conical chamber 91 of pressing plate 68, and plate washer 92 blocks bulb 90, is assembled in the chamber.The forging edge 93 of pressing plate 68 is fixed plate washer on whole circumference.Open a groove on the plate washer 92, so that the neck 95 of valve disc 70 enters in the center hole 94 from center hole 94 to periphery.The impetus of spring 96 makes bulb 90 rely on pressing plate 92, guarantees valve disc 70 centerings.This structure has improved the sealed precision that has the valve disc 70 that exports sleeve 71.

Should recognize that the structure of above-mentioned pressure governor can also change, make it have the sleeve 71 that is contained on the diaphragm 66 and static valve disc.

In use, if because the air pressure that bears on the diaphragm 66 and the comprehensive function effect of spring 67 make fuel pressure be lower than predetermined value, then valve disc 70 will stop at the position (as shown) of hole 72 being closed valve.If pressure constantly raises, until being enough to overcome the air pressure of acting in conjunction on diaphragm 66 and the load of spring 67, diaphragm is crooked to the right as shown in FIG. so before this, and then the promotion valve disc moves, open outlet 72, at this moment the fuel of Shi Fanging just 72 is back in the fuel tank through the hole.

Therefore the pressure governor of above-mentioned this structure can be contained in 11 li of channel components basically, so just can not increase the boundary dimension of motor and fuel system.Simultaneously, in this structure, owing to a certain amount of fuel is arranged, the pressure surge that produces in the time of can suppressing voltage regulator operation in the channel components.

Should recognize that above-mentioned fuel injection system can be used for various forms of internal-combustion engines, no matter as being four-stroke or two stroke motor.Adopt the motor of above-mentioned fuel injection system to be specially adapted to motor,, can be used as outer shipment motor as the motor of aircraft, vehicle and ship etc., when on ship, using as various forms of transport.

Claims (18)

1. fuel injection system that is used for multi-cylinder engine, described system comprises a vertical single piece of rigidity, air supply pipe is arranged in the described single piece and supply fuel pipe, described pipe air supply pipe and the described fuel pipe that supplies are suitable for being connected to source of the gas and fuel source respectively, each described pipe extends along described unitarily formed longitudinal direction, each cylinder of described multi-cylinder engine has at least one quota of fuel and sparger, described quota of fuel and sparger and described single piece are combined into one, it is characterized in that, described quota of fuel and sparger comprise a fuel dosing device and a fuel injection system, described fuel dosing device is suitable for carrying quantitative fuel to described fuel injection system, described fuel dosing device directly is communicated with fuel source, make in use, fuel cycle is by each fuel dosing device, each described quota of fuel and sparger comprise a corresponding fuel cavity that is arranged in this single piece, and constant communication between described air supply pipe and described fuel injection system, each described fuel cavity is positioned to accept the described quantitative fuel from corresponding described fuel dosing device, and each described fuel injection system optionally is communicated with a corresponding cylinder of described internal-combustion engine, so that fuel is transported in the described cylinder, thereby when described fuel injection system is communicated with the cylinder of described internal-combustion engine, from the gas flow of described air supply pipe by described fuel cavity and described fuel injection system, so that carry and carry described quantitative fuel in described cylinder of internal-combustion engine.

2. the fuel injection system of multi-cylinder engine as claimed in claim 1, it is characterized in that, the fuel injection system of described multi-cylinder engine has one and extends to the pipeline of described fuel cavity by described fuel dosing device, and described pipeline positioning becomes to make described quantitative fuel enter into described fuel cavity by described fuel dosing device by described pipeline.

3. the fuel injection system of multi-cylinder engine as claimed in claim 2 is characterized in that, described pipeline is communicated with described air supply pipe in the position of the import of contiguous described fuel, and feasible gas by described pipeline enters in the described fuel cavity.

4. the fuel injection system of multi-cylinder engine as claimed in claim 2, it is characterized in that, described pipe extension is to an opening of the chamber wall of described fuel cavity, described pipeline and described opening limit an annular pass around described pipeline, described annular pass is communicated with between described air supply pipe and described fuel cavity, thereby makes described gas flow to described fuel cavity by described annular pass.

5. the fuel injection system of multi-cylinder engine as claimed in claim 3, it is characterized in that, described pipe extension is to an opening of the chamber wall of described fuel cavity, described pipeline and described opening limit an annular pass around described pipeline, described annular pass is communicated with between described air supply pipe and described fuel cavity, thereby makes described gas flow to described fuel cavity by described annular pass.

6. the fuel injection system of multi-cylinder engine as claimed in claim 3, it is characterized in that, described fuel cavity is configured to be at the opposite side that described fuel enters the inlet of described fuel cavity the surface of inclination, described surface tilts with respect to the runner of the described fuel that enters, and makes by the described fuel of described inclined surface bounce-back mobile towards described fuel injection system.

7. the fuel injection system of multi-cylinder engine as claimed in claim 3, it is characterized in that, described system has an air chamber around described pipeline, described air chamber is communicated with described air supply pipe, having a plurality of apertures, make the internal communication of described gas tube and described pipeline around described pipeline circumference in abutting connection with described fuel dosing device.

8. the fuel injection system of any described multi-cylinder engine of claim as in the above-mentioned claim, it is characterized in that, described system comprises a fuel return pipe, described confession fuel pipe and described fuel return pipe are clipped in therebetween with single first inwall and are arranged side by side, each fuel dosing device has a body, have spaced fuel inlet and fuel outlet in the described body, each fuel dosing device is communicated with and described fuel outlet is communicated with described fuel return pipe and is installed in the described single piece for fuel pipe with described with described fuel inlet by described unitarily formed outer wall and described first inwall with its body.

9. the fuel injection system of multi-cylinder engine as claimed in claim 8, it is characterized in that, each described fuel injection system is installed on the described single piece, so as with extend into described relevant fuel dosing device in the direction that tilts of the direction of single piece body on stretch out from described unitarily formed another outer wall.

10. the fuel injection system of multi-cylinder engine as claimed in claim 9 is characterized in that, described fuel injection system stretches out to extend on the rectangular direction of direction in the described single piece with described fuel dosing device.

11. the fuel injection system of multi-cylinder engine as claimed in claim 9, it is characterized in that, described outer wall and described first inwall roughly are parallel to each other, and described fuel dosing device body is to extend through the described outer wall and first inwall with described outer wall and the rectangular angle of first inwall.

12. the fuel injection system of multi-cylinder engine as claimed in claim 11, it is characterized in that, one second inwall in described single piece is separated for fuel pipe and described air supply pipe described, described fuel cavity is formed in described second inwall at least in part, the body of described fuel dosing device extends in described second inwall so that be communicated with described fuel cavity, so that fuel is transported in the described fuel cavity.

13. fuel injection system as any described multi-cylinder engine in the claim 1 to 7, it is characterized in that, described system comprises also that regulator is mounted to and extends in the described single piece, so that be communicated with described air supply pipe and the described fuel pipe that supplies, in use, described regulator be suitable for remaining in the described air supply pipe gas and for the predetermined pressure differential between the fuel in the fuel pipe.

14. the fuel injection system of multi-cylinder engine as claimed in claim 13, it is characterized in that, the fuel injection system of described multi-cylinder engine also comprises a fuel return pipe, described regulator is suitable for flowing to the fuel flow rate of a fuel tank according to the pressure control in described air supply pipe from fuel return pipe, so that keep described predetermined pressure differential.

15. fuel injection system as any described multi-cylinder engine in the claim 1 to 7, it is characterized in that, described fuel injection system comprises a body, described body has an axial bore, described axial bore has the valve of controlling delivery port at the one end, described axial bore is communicated with described fuel cavity at its other end, described fuel injection system comprises also and being installed in the described body and the coaxial calutron of described axial bore that described calutron optionally opens and closes described delivery port.

16. the fuel injection system of multi-cylinder engine as claimed in claim 15, it is characterized in that, the valve of described control delivery port comprises a valve element, described valve element is suitable for engaging hermetically described delivery port, a hollow valve rod is fixed to described valve element with one end thereof, described valve rod coaxially extends along described axial bore, comprises that also arrangement will be directed to the guiding device of the other end of described hollow valve rod from described fuel cavity.

17. the fuel injection system of multi-cylinder engine as claimed in claim 16, it is characterized in that, described calutron comprises a stationary spiral coil, described spiral winding is positioned to one heart around described hollow valve rod, also comprise an armature, described armature is fixed to the place, described the other end of the described valve rod of vicinity on the described hollow valve rod.

18. the fuel injection system of multi-cylinder engine as claimed in claim 16, it is characterized in that, the fuel injection system of described multi-cylinder engine also has the communication apparatus that the described intrinsic described axial bore with described fuel injection system is communicated with described air supply pipe, described axial bore be independent of being communicated with of described air supply pipe by with being communicated with of described hollow valve rod, make and pass through in the process of delivery port that other has gas to flow to described delivery port by described communication apparatus and described axial bore at transfer the fuel.

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