CN101634243B - Forced air-cooled vehicle engine unit, and automatic motorcycle - Google Patents
Forced air-cooled vehicle engine unit, and automatic motorcycle Download PDFInfo
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- CN101634243B CN101634243B CN 200910161224 CN200910161224A CN101634243B CN 101634243 B CN101634243 B CN 101634243B CN 200910161224 CN200910161224 CN 200910161224 CN 200910161224 A CN200910161224 A CN 200910161224A CN 101634243 B CN101634243 B CN 101634243B
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- guard shield
- air
- cylinder head
- vehicle
- inlet air
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- Y02T10/125—
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- Y02T10/14—
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- Exhaust Gas After Treatment (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
An auxiliary air intake passage defining member 41 is connected to an air intake pipe 36 connected to a cylinder head 23. The auxiliary air intake passage defining member 41 defines an auxiliary air intake passage K1. The auxiliary air intake passage K1 is branched from a main air intake passage P1 in the air intake pipe 36 to guide intake air into a space defined adjacent to an injection nozzle of an injector at least during idling. At least a part of the auxiliary air intake passage defining member 41 is located outside a shroud 50. A portion around the injection nozzle is cooled by assist air from the auxiliary air intake passage K1 during idling. A portion around the injection nozzle is cooled by cooling wind generated by a fan 56 during the movement of a vehicle.
Description
Technical field
The present invention relates to forced air-cooled vehicle engine unit and automotive bicycle.
Background technique
In patent documentation 1 disclosed motor, be provided with main inlet air pathway from air-strainer to the firing chamber of motor that carry air from.Divide expenditure secondary inlet air pathway from main inlet air pathway.Sparger is installed on the cylinder head of motor.In secondary inlet air pathway, the air inlet of autonomous inlet air pathway is flowed as auxiliary air (assist air) when idle running at least.Auxiliary air is blown to the fuel that ejects from sparger and promotes the pelletizing of fuel.The combustion efficiency of the fuel when thus, having improved idle running at least.
The motor of being put down in writing in the patent documentation 1 is to constitute to make the wind of going arrive the naturally air-cooled engine of motor, and the said wind that goes is the wind that produces through going of vehicle.Thus, come cooled engine through the wind that goes.
In general, as the motor that on vehicles such as automotive bicycle, uses, known motor or the water-cooled motor that air-cooling type is arranged.Air cooled engine comes cooled engine through making air blow to motor.Therefore, air cooled engine does not need needed radiator of water-cooled engine and cooling waterpump etc., so simple structure.
The motor of being put down in writing in the patent documentation 1 comes cooling air cylinder cap and sparger owing to sparger is installed on the cylinder head through the wind that goes.Thus, suppressed in being supplied to the fuel of sparger, to produce vapour lock, promoted atomizing, thereby can improve combustion efficiency.
But the motor of being put down in writing in the patent documentation 1 is a naturally air-cooled engine.Therefore, the position configuration motor that the sailing of need being expert at blows to easily exists the low problem of degrees of freedom that on vehicle, disposes motor.
Relative therewith, as putting down in writing in the patent documentation 2, developed rotation and the forced air cooling type motor of the guard shield of the cylinder head of driven fan and covering engine and cylinder block etc. with the bent axle through motor.The wind that is produced by fan blows to cylinder head and cylinder block through guard shield inside, thus cooled engine.In the forced air cooling type motor, cool off the motor that is configured in the part in the guard shield through fan.
The forced air cooling type motor therefore need be with engine configurations in the position of being arrived by the wind of going because the cooling of motor does not rely on the wind that goes.Therefore, the degrees of freedom of the engine configurations on the vehicle is high.
(existing technology document)
(patent documentation)
Patent documentation 1: international publication WO2005/098231 communique;
Patent documentation 2: the Japanese documentation spy opens the 2001-241326 communique.
Summary of the invention
As stated, the naturally air-cooled engine that patent documentation 1 is put down in writing is owing to the pelletizing that promotes fuel through auxiliary air, so the rate of combustion of fuel is high.But, owing to need make the wind of going to motor, so the degrees of freedom of layout is low.
In addition, the forced air cooling type motor that patent documentation 2 is put down in writing is not because need be with engine configurations in the position that wind arrives by going, so the degrees of freedom of the layout on the vehicle is high.
Therefore, hope will be as patent documentation 1 be put down in writing installs sparger and forced air cooling type motor that the engine application that promotes through auxiliary air to atomize is put down in writing in patent documentation 2 on the cylinder head of motor.This be because: the high motor of layout degrees of freedom on the high and vehicle of the combustion efficiency of fuel can be provided thus.
The present invention is based on above-mentioned situation and accomplishes, and its purpose is to provide forced air-cooled vehicle engine unit that the layout degrees of freedom on a kind of simple structure, the vehicle is high and combustion efficiency fuel is high and the automotive bicycle with this forced air-cooled vehicle engine unit.
Forced air-cooled vehicle engine unit of the present invention comprises: engine main body, this engine main body comprise the crankcase that holds bent axle, connect and hold the cylinder block of the piston that can move back and forth and form the firing chamber with said cylinder block and form the cylinder head of the part of the main inlet air pathway that is connected with said firing chamber with said crankcase; Suction tude is connected with said cylinder head, and forms said main inlet air pathway with said cylinder head; Guard shield covers the part of said cylinder head at least; Fan is configured between said guard shield and the said engine main body, is driven and produce the cooling air that is used to cool off said engine main body through the rotation of said bent axle; Throttle body, this throttle body are included in devices spaced apart on the flow direction of the inherent air inlet of said suction tude and two throttle valve disposing and form the part of said suction tude and hold the cylinder of said two throttle valve, are arranged on outside the said guard shield; And fuel injection system, be installed on the said cylinder head, and have the jet nozzles of the said main inlet air pathway burner oil in said cylinder head.And; Forced air-cooled vehicle engine unit comprises secondary inlet air pathway organizator, this pair inlet air pathway organizator be formed between said two throttle valve from said main inlet air pathway branch come out and at least when the idle running with near the secondary inlet air pathway of the space guiding of the said air inlet said jet nozzles that is formed on the said cylinder head.At least on the part around the said secondary inlet air pathway, be formed with the space that is communicated with in the said guard shield and the air flue in the space outside the said guard shield.
According to the present invention, the forced air-cooled vehicle engine unit that degrees of freedom is high and combustion efficiency fuel is high of the layout on a kind of simple structure, the vehicle and the automotive bicycle with this forced air-cooled vehicle engine unit can be provided.
Description of drawings
Fig. 1 is the right hand view of the automotive bicycle of mode of execution one of the present invention;
Fig. 2 is the right hand view of part that has amplified the automotive bicycle of body cover periphery;
Fig. 3 is the partial section of engine unit, has represented to overlook the state of engine unit;
Fig. 4 is the longitudinal section of the major component of engine unit, has represented to observe from the right side state of engine unit;
Fig. 5 is the right hand view of engine unit, cuts a part open and representes, and represented a part through the double dot dash line as imaginary line;
Fig. 6 is the schematic right hand view of throttle body;
Fig. 7 is the figure of relation of aperture of aperture and second throttle valve of expression first throttle valve;
Fig. 8 is the schematic right hand view of the first throttle valve and second throttle valve throttle body when being in standard-sized sheet;
Fig. 9 is the planimetric map of guard shield;
Figure 10 is the left surface figure of engine unit;
Figure 11 is the ground plan of the part of guard shield;
Figure 12 is the sectional view along the major component of the XII-XII line intercepting of Fig. 3;
Figure 13 is the front elevation of the major component of engine unit, has represented a part through the cross section;
Figure 14 is the partial enlarged drawing of Fig. 9;
Figure 15 is the partial section of the major component of another embodiment of the present invention.
Embodiment
< accomplishing process of the present invention >
(1) present inventor has studied the engine application that will sparger be installed on cylinder head and promote fuel atomization through auxiliary air in the scheme of forced air cooling type motor.This be because: can realize the high motor of layout degrees of freedom on the high and vehicle of the combustion efficiency of fuel thus.
(2) in this case, secondary inlet air pathway is set on the forced air cooling type motor.Thus, blow the auxiliary air of coming to the fuel that ejects from sparger via secondary inlet air pathway.In the forced air cooling type motor, cover the engine main body that comprises cylinder block etc. through guard shield.And, in guard shield, import air through the fan that is configured in the guard shield, and through making air in guard shield, flow the cooled engine main body.Therefore, preferably come the part as much as possible of covering engine main body through guard shield.But if come the covering engine main body through guard shield, then the heat of engine main body is trapped in the periphery of guard shield easily, and the result has caused the sparger periphery to become high temperature easily.In case the sparger periphery becomes high temperature, then in being supplied to the fuel of sparger, produce bubble easily.As a result, vapour lock or surge (breathing) can take place, thereby cause the combustion efficiency of fuel to descend.
In addition, even just owing to being covered on the motor that causes heat to be detained easily by guard shield secondary inlet air pathway is being set, secondary inlet air pathway also can become high temperature with its inner auxiliary air of flowing through.As a result, the fuel that is ejected and the mixed gas of auxiliary air can become high temperature, and the concentration of oxygen is step-down correspondingly, so the combustion efficiency of fuel can descend.Because fan rotates with the bent axle that motor had, therefore the rotating speed of fan also can descend when idle running.Therefore, when idle running, the cooling performance of fan descends, and the heat that exists from engine main body is trapped in the problem in the guard shield easily.The present inventor pays close attention to above situation and has accomplished the present invention.
The time carried out separately considering with idle running when (3) present inventor is to vehicle driving.That is, notice as long as when vehicle driving, you can well imagine the performance of high cooling fuel injection system with the idle running time-division.
(A) during vehicle driving
At first, during about vehicle driving, because fan with the bent axle high speed rotating, therefore is conceived to can expect to cool off this situation through fan.Owing to cool off the sparger of the injection apparatus that acts as a fuel, therefore expected sparger and connected secondary inlet air pathway and guard shield are separated the structure that the space disposes through the cooling of fan.According to this structure, air is flowed laterally near sparger and secondary inlet air pathway from the guard shield inboard.Thus, can improve the cooling property of sparger in motion through the cooling air that produces by fan.
(B) during idling of vehicle
When then, having studied idle running.When idle running,, therefore can't expect to cool off through fan because bent axle and fan are in low speed rotation.But, for the combustion efficiency that makes fuel rises, adopted from main inlet air pathway branch come out and at least when the idle running with near the secondary inlet air pathway of the space guiding of air inlet (auxiliary air) jet nozzles that is formed on the cylinder head.Like this, adopted the structure that is used to carry out air auxiliary (air assist).In this structure, be conceived to when idle running, can come this situation of cooling injection device through the auxiliary air of coming from secondary inlet air pathway supply.
On this basis, the throttle body of further having expected being connected with secondary inlet air pathway is configured in the structure in the outside of guard shield.Thus, the upstream side of secondary at least inlet air pathway is not vulnerable to the influence of the heat in the guard shield.Therefore, the temperature of the air inlet of the secondary inlet air pathway that can suppress to flow through rises, thus can be when idle running the cooling injection device.
The present inventor has as above accomplished the present invention.
< mode of execution one >
Below, specialized mode of execution of the present invention with reference to accompanying drawing explanation.Below the front and back in the explanation, up and down and about all directions be that this driver's during with automotive bicycle is in Yu straightaway state is suitable on horizontal plane reference attitude and driver's face forward viewpoint is a benchmark.
In addition, in each figure, represent the place ahead of automotive bicycle through arrow F.Likewise, in each figure, represent the rear of automotive bicycle through arrow B; The top of representing automotive bicycle through arrow U; Represent the below of automotive bicycle, to represent the right-hand of automotive bicycle through arrow D through arrow R through the left that arrow L representes automotive bicycle.
Fig. 1 is the right hand view of the automotive bicycle 200 of mode of execution one of the present invention.In Fig. 1, cut the part of automotive bicycle 200 open and represented.In this mode of execution, automotive bicycle 200 is scooter (scooter).In this mode of execution, as an example of automotive bicycle of the present invention scooter is described, but is not limited thereto.The present invention also can be applied to scooter so-called motorcycle (motor cycle), autocycle (moped), go-anywhere vehicle (off road) in addition and wait other automotive bicycle.
Dispose handle 10 in the front portion of automotive bicycle 200.Handle 10 links with front-wheel 14 via the steering shaft 13 of inserting penetrator pipe 11.On head pipe 11, be combined with vehicle body frame 15.
Vehicle body frame 15 is whole shapes of on vehicle fore-and-aft direction X1, extending.The front end of vehicle body frame 15 combines with head pipe 11.At the rear portion of vehicle body frame 15 vehicle seat 16 is installed.Ratio vehicle seat 16 position on the front in vehicle body frame 15 is equipped with foot treadle 17.Foot treadle 17 is positioned at the position of leaning on the below than vehicle seat 16.
In addition, body cover 18 is installed on vehicle body frame 15.Body cover 18 is the shapes of holding up to the top from the rear portion of foot treadle 17, and surrounds the following side space G1 of vehicle seat 16.
Shown in the local amplification profile of Fig. 2, body cover 18 forms the following side space G1 that surrounds vehicle seat 16.This body cover 18 comprises antetheca 202 and the pair of sidewalls 203 of below that is configured in right part and the left part of vehicle seat 16 of the below of the front end that is configured in vehicle seat 16.But, in Fig. 2, only represented the sidewall 203 on the right side in the pair of sidewalls 203.Pair of sidewalls 203 forms bilateral symmetry.
The engine unit 20 of swing bodies formula is installed on vehicle body frame 15.Engine unit 20 is engine units of forced air cooling type.The part of engine unit 20 is covered by body cover 18.Specifically, engine unit 20 after forward end and the forward end of guard shield 50 of the engine main body 21 stated covered by body cover 18.
As expressing best among Fig. 1, engine unit 20 comprises engine main body 21, suction tude 36, throttle body 38, secondary inlet air pathway organizator 41 and guard shield 50.
Engine main body 21 is configured in the rear of the antetheca 202 of body cover 18 in the following side space G1 of vehicle seat 16.
Fig. 3 is the partial section of engine unit 20, has represented to overlook the state of engine unit 20.That is the horizontal section of, having represented the part of engine unit 20.The cylinder-bore axis of engine main body 21 is towards vehicle fore-and-aft direction X1.Engine main body 21 is single-cylinder four-stroke engines.Engine main body 21 comprises cylinder block 22, be installed in cylinder head 23 and the crankcase 24 that is installed in the rearward end of cylinder block 22 of the front end of cylinder block 22.
Crankcase 24 constitutes the rearward end of engine main body 21.In crankcase 24, accommodate the bent axle 57 that on left and right vehicle wheel direction Y1, extends.Bent axle 57 is rotatably supported by crankcase 24 via bearing 281,282.The right part 204 of bent axle 57 is outstanding from the right flank 246 of crankcase 204.But one links rotatably on the right part 204 of bent axle 57 fan 56 is arranged.Rotation through bent axle 57 comes drive fan 56.Fan 56, imports to air in the guard shield 50 as cooling air from the inboard importing in the lateral air of guard shield 50 for cooled engine main body 21.In addition, be connected with the big end of connecting rod 205 at the intermediate portion of bent axle 57.
As shown in Figure 1, crankcase 24 links via pivot 25 with vehicle body frame 15.The axis of pivot 25 extends along left and right vehicle wheel direction Y1.In addition, via transmission unit 26 trailing wheel 27 is installed at the rear portion of engine unit 20.In addition, between the rear portion of the rear portion of transmission unit 26 and vehicle body frame 15, rear shock absorber 28 is installed.According to this structure, engine unit 20 can be that oscillation center is swung to above-below direction with pivot 25 with respect to vehicle body frame 15 with trailing wheel 27.
Fig. 4 is the longitudinal section of the major component of engine unit 20, has represented to observe from right flank the state of engine unit 20.The space that is contained between piston 29 in the cylinder block 22, cylinder block 22, the cylinder head 23 is the firing chamber A1 that mixed gas burns therein.In cylinder head 23, be provided with suction valve 210 and aforesaid outlet valve in the face of firing chamber A1.
Fig. 5 is the right hand view of engine unit 20, has cut a part open and has represented, and represented a part through the double dot dash line as imaginary line.With reference to Fig. 4 and Fig. 5, be provided with first boss (boss) 32 of tubular on the right flank top of cylinder head 23.First boss 32 forms with cylinder head 23.First boss 32 is outstanding to the outside of guard shield 50 from cylinder head 23.The part of the tip side of first boss 32 is positioned at the outside of guard shield 50, exposes from guard shield 50.The main inlet air pathway P1 that states behind the inner space of first boss 32 and suction valve 210 peripheries is communicated with.
The sparger 34 of the injection apparatus that acts as a fuel is installed via plastic fixture 33 on first boss 32.Therefore sparger 34 is positioned at the front end of engine main body 21 owing to be installed on the cylinder head 23.
With reference to Fig. 4, the lip part 212 that fixture 33 comprises cylindrical part 211 and is arranged on the cardinal extremity of cylindrical part 211.The top butt of the lip part 212 and first boss 32.Thus, fixture 33 is positioned with respect to first boss 32.Cylindrical part 211 is contained among the holding space H1 of the inboard that is formed at first boss 32.Sealed by the close property of first sealed member, 214 liquid such as O shape ring ground between the outer circumferential face of the base end part 213 of cylindrical part 211 and the inner peripheral surface of first boss 32.Between the inner peripheral surface of the outer circumferential face of the intermediate portion 215 of cylindrical part 211 and first boss 32, be formed with chamber G2 as annular gap.The tip edge of the tip portion 216 of cylindrical part 211 roughly seamlessly cooperates with the inner peripheral surface of first boss 32.
The inner space of the tip portion 216 of cylindrical part 211 is used as jet space G3, and this jet space G3 is near the space the jet nozzles 35 of sparger 34.Jet space G3 is formed in the cylinder head 23, is communicated with firing chamber A1 via suction valve 210.On the tip portion 216 of cylindrical part 211, be formed with a plurality of through holes 217.Through hole 217 equally spaced is formed with a plurality of (for example four) on the circumferencial direction of the tip portion 216 of cylindrical part 211.Chamber G2 and jet space G3 are communicated with through this through hole 217.
On cylinder head 23, be formed with the suction port 221 of tubular.Formed the main inlet air pathway P1 in the cylinder main body 21 through suction port 221.End at suction port 221 disposes suction valve 210.The other end of suction port 221 is in the upper surface open of cylinder head 23.The other end of this suction port 221 is formed by the flange 222 that is formed on the cylinder head 23.This flange 222 and the flange 223 that is formed on the front end of connecting tube 39 are docked each other, and use not shown fixed-use bolt that both are fixed.Thus, suction port 221 is connected with the front end (being the downstream of suction tude 36) of connecting tube 39.
The first and second throttle valve 40A, 40B are respectively applied for the main inlet air pathway P1 that opens and closes in the suction tude 36.Devices spaced apart configuration on the flow direction C1 of first throttle valve 40A and the air inlet of the second throttle valve 40B in main inlet air pathway P1.The first throttle valve 40A and the second throttle valve 40B are contained in the cylinder 220.On the flow direction C1 of air inlet, first throttle valve 40A is configured in the position of leaning on the downstream side than the second throttle valve 40B.That is, in main inlet air pathway P1, first throttle valve 40A is between the second throttle valve 40B and cylinder head 23.The first throttle valve 40A and the second throttle valve 40B form discoideus respectively.
Fig. 6 is the schematic right hand view of throttle body 38.With reference to Fig. 6, first running shaft 224 and second running shaft 225 are rotatably supported by cylinder 220 respectively.Through the rotation of first running shaft 224, first throttle valve 40A rotates around first running shaft 224 and with first running shaft 224 integratedly.Equally, through the rotation of second running shaft 225, the second throttle valve 40B rotates around second running shaft 225 and with second running shaft 225 integratedly.
But one links rotatably on second running shaft 225 driving pulley 226 is arranged.Carburetor cable (not shown) is installed on driving pulley 226.Thus, driving pulley 226 rotates with the throttle operation of being undertaken by the driver linkedly.Through the rotation of driving pulley 226,225 rotations of second running shaft, the second throttle valve 40B is opened and closed.
Second main link component 229 is the little chip parts that form with driving pulley 226.Second main link component 229 can be that the center rotates with second running shaft 225.Second main link component 229 can link with slave connecting rod parts 230 via second connection shaft 232 with the relative rotation.
Slave connecting rod parts 230 are bar-like members long on vehicle fore-and-aft direction X1, and second main link component 229 is associated with first main link component 228.Backend arrangement at slave connecting rod parts 230 has second connection shaft 232.The front end of slave connecting rod parts 230 can link with first main link component 228 via first connection shaft 233 with the relative rotation.
First main link component 228 is the elongated parts that formed by sheet metal.The front end of first main link component 228 and said first connection shaft 233 link.The intermediate portion of first main link component 228 and first running shaft 224 can link with the relative rotation.Thus, first main link component 228 can be independent of first running shaft 224 and rotate.Be provided with push part 234 in the rear end of first main link component 228.
From the distance as the central axis J2 of central axis J1 to the second connection shaft 232 of second running shaft 225 of the oscillation center of second main link component 229 is D2.And, be D1 from distance as the central axis J4 of central axis J3 to the first main link component 233 of first running shaft 224 of the oscillation center of first main link component 228.Distance B 1 has the relation of D2＞D1 with D2.
With reference to Fig. 4, secondary inlet air pathway organizator 41 extends setting from the cylinder 220 of throttle body 38, and is formed up to first boss 32 of cylinder head 23.The configured in one piece of secondary inlet air pathway organizator 41 is in the outside of guard shield 50.Secondary inlet air pathway organizator 41 has formed secondary inlet air pathway K1.
Secondary inlet air pathway organizator 41 comprises second boss 236 that is fixed on the cylinder 220, be formed on the 4th boss 239 on the cylinder head 23 with first boss 32, be configured in the cylindrical part 211 of the fixture 33 in first boss 32, the flexible pipe 237 that is installed in the 3rd boss 238 on the 4th boss 239 and is connected the 3rd boss 238 and second boss 236.
One end of the 3rd boss 238 is connected with the other end of flexible pipe 237.The 4th boss 239 and first boss 32 form.The 4th boss 239 and first boss 32 are configured to central axis quadrature roughly each other.With reference to Fig. 4 and Fig. 5, the 4th boss 239 is configured in the outside of guard shield 50.The through hole 217 of the secondary inlet air pathway K1 in the other end of flexible pipe 237, third and fourth boss 238 and 239, the chamber G2 in first boss 32 and cylindrical part 211 has constituted the downstream K3 of secondary inlet air pathway K1.Downstream K3 is communicated with first boss, 32 interior jet space G3.On the 4th boss 239, be connected with the other end of the 3rd boss 238.The cylindrical part 211 of the other end through flexible pipe 237, the 3rd boss 238, the 4th boss 239, first boss 32 and fixture 33 has constituted the downstream formation portion 241 of secondary inlet air pathway organizator 41.This downstream formation portion 241 is configured in the outside of guard shield 50.In first boss 32, downstream formation portion 241 parts by the outside that is configured in guard shield 50 form.
According to said structure, the upstream extremity K2 of secondary inlet air pathway K1 forms portion 240 by the upstream extremity of second boss 236 and forms, and between the first and second throttle valve 40A, 40B, is communicated with main inlet air pathway P1.And the downstream K3 of secondary inlet air pathway K1 forms portion 241 by downstream and forms.Downstream K3 is communicated with jet space G3.
Air inlet gets into as auxiliary air to secondary inlet air pathway K1 from main inlet air pathway P1.The auxiliary air that has passed through secondary inlet air pathway K1 is directed among the jet space G3.The auxiliary air that is supplied to jet space G3 is blown to the fuel that ejects from sparger 34, promotes the pelletizing of fuel thus.
Fig. 7 is the figure of relation of aperture of aperture and the second throttle valve 40B of expression first throttle valve 40A.In Fig. 7, the aperture of first throttle valve 40A is expressed as zero in the time of will dallying.The aperture of the second throttle valve 40B will be expressed as zero when equally, also will dally.
In Fig. 7, the figure of solid line has represented the first and second throttle valve 40A in this mode of execution, the aperture of 40B.Shown in the figure of this solid line, when the aperture of the second throttle valve 40B is 10 degree when following, the aperture of first throttle valve 40A remains 0 and spends.
On the other hand, in Fig. 7, the figure of dotted line representes owing to the identical all the time situation of aperture that lost motion mechanism makes first and second throttle valve is not set.Shown in the figure of the figure of these dotted lines and solid line, in this mode of execution, the second throttle valve 40B is later than first throttle valve 40A and carries out breakdown action.About the action of the first and second throttle valve 40A, 40B, will explain in further detail below.
With reference to Fig. 6 and Fig. 7, the aperture of the first throttle valve 40A and the second throttle valve 40B is controlled along with the variation of load (throttle operation amount) as follows.At first, the first throttle valve 40A that is positioned at the downstream side on the flow direction C1 of air inlet is remaining on full close position from non-loaded (idle running) operation area to predetermined partial load run zone.
Specifically, till the partial load run zone, be accompanied by driver's throttle operation and the rotation of the driving pulley 226 that produces is not passed to first running shaft 224, and only be passed to second running shaft 225.Therefore, through the rotation of second running shaft 225, only the second throttle valve 40B opens and closes.At this moment, the action of slave connecting rod parts 230 and first main link component 228 and second main link component 229 mutually the interlock earthquake do.Thus, first main link component 228 is around 224 rotations of first main link component.But, the push part 234 of first main link component 228 abut to be urged parts 235 before, first running shaft 224 does not rotate with first throttle valve 40A.
Therefore, till the partial load run zone, only flow into air quantity among the jet space G3 of jet nozzles 35 and be according to the aperture of the second throttle valve 40B and controlled.In this partial load run zone, flow into auxiliary air among the secondary inlet air pathway K1 in jet space G3 with the fuel mix that ejects from jet blower 35.Thus, can promote the pelletizing of fuel, improve the combustion efficiency of fuel.Therefore, also can reduce the unburned fuel that when engine cold-start, is easy to generate.
On the other hand, be transformed into the process of high capacity operation area from the partial load run zone, first throttle valve 40A opens corresponding to throttle operation gradually.Thus, be not only the auxiliary air of the secondary inlet air pathway K1 that flows through, the air inlet of the other end of the suction port 221 of flowing through also is directed in the cylinder head 23.
Specifically, with reference to Fig. 7 and Fig. 8,, be that the rotating amount of first main link component 228 of benchmark surpasses predetermined value during with idle running when when the partial load run zone is transformed into the high capacity operation area.As a result, the push part 234 of first main link component 228 abuts to the portion that is urged 235 of rotation transmission member 231.Thus, rotation transmission member 231 and of the rotation mutually linkedly rotation of first running shaft 224 with first main link component 228, thus make first throttle valve 40A rotation.Thus, be not only the air inlet of the secondary inlet air pathway K1 that flows through, the air of the connecting tube 39 of flowing through also is directed in the cylinder head 23.
As previously mentioned, in linkage mechanism 227, distance B 2＞distance B 1, therefore in the high capacity operation area, the opening and closing speed of first throttle valve 40A is faster than the opening and closing speed of the second throttle valve 40B.As a result, when having made the second throttle valve 40B standard-sized sheet, first throttle valve 40A also becomes standard-sized sheet.
With reference to Fig. 1, the baffler 44 that the outlet pipe 43 that links to each other with the outlet valve of cylinder head 23 is connected with rearward end with outlet pipe 43 is installed on engine main body 21.Outlet pipe 43 slenderly extends along vehicle fore-and-aft direction X1 with baffler 44 as a whole.
Fig. 9 is the planimetric map of guard shield 50.In Fig. 9, through represented the part of engine unit 20 as the double dot dash line of imaginary line.With reference to Fig. 5 and Fig. 9, the guard shield 50 that is used for cooled engine main body 21 is installed on engine main body 21.Guard shield 50 comprises that the integral body with cylinder block 22 spreads all over and surrounds allly and will spread all over full cylindrical portion of surrounding 51 as the rearward end 207 of the part of cylinder head 23 allly, cover the side plate 52 and the protective gear 53 of crankcase 24 from the right side of crankcase 24 entirely.
In addition, guard shield 50 through with about two half member 54L, 54R be integrated and constitute.The front end of the integral body of half member 54L through the left side and the half member 54R on right side has constituted cylindrical portion 51.And, lean on the part at rear to constitute side plate 52 and protective gear 53 by the ratio cylindrical portion among the half member 54R on right side 51.
With reference to Fig. 3 and Fig. 5, cylindrical portion 51 comprises the right side that is configured in engine main body 21 and has the right wall 242 of outstanding to the right shape.The part of the right flank of the rearward end 207 of right wall 242 coating gas cylinder caps 23 and the right flank of cylinder block 22.The outstanding to the right projecting degree of right wall 242 is that the rear end is bigger than front end.
In addition, like Fig. 9 and shown in Figure 10 as the left surface figure of the major component of engine unit 20, cylindrical portion 51 also comprises the upper wall 243 of the top that is configured in engine main body 21 and the left wall 244 that is configured in the left of engine main body 21.The part of the upper surface of the rearward end 207 of upper wall 243 coating gas cylinder caps 23 and the upper surface of cylinder block 22.
The part of the left surface of the rearward end 207 of left side wall 244 coating gas cylinder caps 23 and the left surface of cylinder block 22.And cylinder 220 is configured in the substantial middle position of the engine main body 21 on the left and right vehicle wheel direction Y1.
Figure 11 is the ground plan of the major component of guard shield 50.In Figure 11, through represented the part of engine unit 20 as the double dot dash line of imaginary line.With reference to Fig. 5 and Figure 11, cylindrical portion 51 also comprises the diapire 245 of the below that is configured in engine main body 21.The part of the bottom surface of the rearward end 207 of diapire 245 coating gas cylinder caps 23 and the bottom surface of cylinder block 22.
With reference to Fig. 3 and Fig. 5, side plate 52 is included in left and right vehicle wheel direction Y1 right flank 246 last and crankcase 24 and clips fan 56 and relative main board portion 247 and the circular-arc circular-arc board of giving prominence to from the peripheral edge of main board portion 247 248.Main board portion 247 covers the right flank 246 of crankcase 24 from the right side.The front end of main board portion 247 is connected with the right wall 242 of cylindrical portion 51.
Circular-arc board 248 forms circular-arc.Circular-arc board 248 extends to the right flank of crankcase 24 246 from main board portion 247, and with the right flank 246 of crankcase 24 across the 3rd sealed member 249 and adjacency.Circular-arc board 248 uses not shown fixed-use bolt and is fixed on the crankcase 24.
With reference to Fig. 3, between the inner peripheral surface of the outer circumferential face of the rearward end 207 of the outer circumferential face of cylinder block 22 and cylinder head 23 and cylindrical portion 51, be formed with front space M1.And, between the right flank 246 of the internal surface of side plate 52 and crankcase 24, be formed with back space M2.Formed the cooling air passway M3 that the cooling air of fan 56 passes through through these front space M1 and back space M2.The part of cooling air passway M3 is between the rearward end 207 of the front end of guard shield 50 and cylinder head 23.
The front end of space M 1 forwardly, the outer surface of the part of the front end of cylindrical portion 51 and cylinder head 23 is by hermetic sealing.The detailed structure relevant with sealing will be explained in the back.
On the other hand, the rear end of space M 1 forwardly, the back edge of cylindrical portion 51 hermetic contacts with the front-end face 206 of crankcase 24.Specifically, front-end face 206 butts of the back edge separately of the upper wall 243 of cylindrical portion 51, left wall 244 and diapire 245 and crankcase 24.
In addition, in back space M2, hermetic sealed between the circular-arc board 248 of side plate 52 and the right flank 246 of crankcase 24.Below the structure relevant with sealing will be described.
Figure 12 is the sectional view along the major component of the XII-XII line of Fig. 3.With reference to Fig. 3 and Figure 12, the 3rd circular-arc sealed member 249 is between the right flank 246 of the left end edge of the circular-arc board 248 of side plate 52 and crankcase 24.The 3rd sealed member 249 forms the shape consistent with the circular shape of circular-arc board 248.
The upper surface of crankcase 24, bottom surface, trailing flank and left surface are not covered by guard shield 50 and expose.
On vehicle fore-and-aft direction X1, dispose aforesaid fan 56 in the rearward end of guard shield 50.Fan 56 is configured in the back space M2.In addition, on side plate 52, be formed with air input part 58.Air input part 58 comprises a plurality of little opening of the right side side that is formed on fan 56.In case fan 56 rotations, then extraneous gas is flowed through air input part 58 and is directed in the back space M2.
With reference to Fig. 5 and Figure 11, be formed with through hole 59 at the front end of guard shield 50.Through hole 59 is configured in the forward end of the right wall 242 and the diapire 245 of cylindrical portion 51.In through hole 59, insert and be installed with above-mentioned outlet pipe 43.And, be formed with exhaust port 250 in the forward end of diapire 245.Exhaust port 250 for example forms rectangular-shaped opening.Through hole 59 is arranged on the left and right vehicle wheel direction Y1 with exhaust port 250.
The cooling air that is imported to by fan 56 in the back space M2 of cooling air passway M3 flows among the front space M1.At this moment, cooling air contacts with the surface of engine main body 21, absorbs heat from engine main body 21 thus.
Then, to the outer surface of the rearward end 207 of the front end of cylindrical portion 51 and cylinder head 23 between the relevant structure of sealing describe.
Figure 13 is the front elevation of the major component of engine unit 20, has represented a part through the cross section.Front end in cylindrical portion 51 disposes the 4th sealed member 251 and the 5th sealed member 252 that elastic members such as using rubber is processed.In Figure 13, the 4th sealed member 251 and the 5th sealed member 252 have been represented through the cross section.
The 4th sealed member 251 is that integral body forms banded integrally formed, is installed on the cylindrical portion 51.The 4th sealed member 251 comprises first portion 253 and second portion 254.
Front end at upper wall 243 is formed with outstanding lip part 255 downwards.The first portion 253 of the 4th sealed member 251 is installed on the edge part of lip part 255 of this upper wall 243.This first portion 253 is with hermetic sealing between the relative part of the outer surface of lip part 255 and cylinder head 23.
In addition, the front end at left wall 244 is formed with outstanding to the right lip part 256.The lip part 256 of left side wall 244 forms with the shape of the left surface of cylinder head 23 accordingly.Specifically, the left side of the mediad on the vehicle above-below direction Z1 of lip part 256 depression.The second portion 254 of the 4th sealed member 251 forms slotted shape.Thus, second portion 254 forms along the shape of the edge part of the lip part 256 of left wall 244.The second portion 254 of the 4th sealed member 251 is installed on the edge part of lip part 256 of left wall 244.Second portion 254 is with hermetic sealing between the relative part of the left surface of this lip part 256 and cylinder head 23.
The 5th sealed member 252 is to form banded integrally formed, and is maintained on the cylindrical portion 51.The 5th sealed member 252 comprises first portion 257, second portion 258 and third part 259.
The front end of diapire 245 be formed with to above outstanding lip part 260.The part butt relative in the bottom surface of lip part 260 and cylinder head 23 with lip part 260.Intermediate portion on the left and right vehicle wheel direction Y1 of the first portion 257 of the 5th sealed member 252 from the edge part of the lip part 260 of diapire 245 is installed to the right part.This first portion 257 is with hermetic sealing between the relative part of the bottom surface of the lip part 260 of diapire 245 and cylinder head 23.
Be formed with to the outstanding lip part 261 of the right flank of cylinder head 23 in the lower end of the front end of right wall 242.The second portion 258 of the 5th sealed member 252 is installed on the edge part of lip part 261 of this right side wall 242.Second portion 258 is with hermetic sealing between the relative part of the right flank of lip part 261 and cylinder head 23.
Outer surface with the 5th boss of giving prominence to from cylinder head 23 262 contacts the third part 259 of the 5th sealed member 252 from the front side.The upper end of the third part 259 of the 5th sealed member 252 is fixed on the cylinder head 23 near the 5th boss 262.The 5th boss 262 is used for spark plug (not shown) is inserted through in the cylinder head 23.
With reference to Fig. 5 and Figure 13, be formed with by the 5th boss 262 at the front edge of right wall 242 and insert the recesses of wearing 263.The edge part of this recess 263 contacts with the outer surface of the 5th boss 262.The outer surface of the 5th boss 262 is surrounded by the edge part of this recess 263 and the third part 259 of the 5th sealed member 252.
Figure 14 is the partial enlarged drawing of Fig. 9.With reference to Fig. 5 and Figure 14, be formed with notch 60 at the front end of the upper wall 243 of cylindrical portion 51.Notch 60 is that the part through the front end that makes upper wall 243 forms to the rear side depression.The edge part 264 of notch 60 comprises first edge part 265 relative with the flange of cylinder head 23 222 and second edge part 266 and three edge part 267 relative with the downstream formation portion of secondary inlet air pathway organizator 41 241.
The flange 222 of cylinder head 23 comprises the relative portion 268 relative with first edge part 265.The shape of first edge part 265 is along the shape formation of portion 268 relatively.Specifically; In planimetric map; Front part on the vehicle fore-and-aft direction X1 of first edge part 265 and vehicle fore-and-aft direction X1 almost parallel; The oblique to the right rear extension of intermediate portion on the vehicle fore-and-aft direction X1, and rear section on the vehicle fore-and-aft direction X1 and left and right vehicle wheel direction Y1 almost parallel.
Middle body on the left and right vehicle wheel direction Y1 in the notch 60 is the first open area N1 that is used to make the flange 222 of cylinder head 23 to expose.Hermetic sealed by the 6th sealed member 269 between the relative portion 268 of the flange 222 of first edge part 265 and cylinder head 23.The 6th sealed member 269 is installed on the upper wall 243.
In addition, in right hand view, the rear end of second edge part 266 has the shape of extending with vehicle fore-and-aft direction X1 almost parallel ground.And in right hand view, the front end of second edge part 266 has the shape to the downside depression.The outer surface of the 4th boss 239 has the relative portion 270 relative with second edge part 266.In addition, the outer surface of the other end of flexible pipe 237 has the relative portion 272 relative with second edge part 266.The degree that second edge part 266 and portion's 270 each intervals are relatively counted mm, and second edge part 266 and the portion's 272 each intervals relatively degree of counting mm.
Thus, in the relative portion of each of second edge part 266 and downstream formation portion 241 270, formed the first air flue Q1 between 272.That is, second edge part 266 in the guard shield 50 is used as the edge part that forms the first air flue Q1.And, the relative portion 270,272 of each in the secondary inlet air pathway organizator 41 be used as and guard shield 50 between form the part of the first air flue Q1.
The first air flue Q1 makes cooling air passway M3 and guard shield 50 spatial communication outward in the guard shield 50.The part of the cooling air in the cooling air passway M3 is discharged to outside the guard shield 50 through the first air flue Q1.
The 3rd edge part 267 is configured in the right-hand member of the front end of notch 60.And, the 3rd edge part 267 be configured in first boss 32 near.The 3rd edge part 267 forms circular-arc.The 3rd edge part 267 is along extending with the 3rd edge part 267 relative relative portions 271 in the outer surface of first boss 32.That is, relative portion 271 forms the part of downstream formation portions 241.
The degree that relative portion 271 each intervals of the 3rd edge part 267 and first boss 32 are counted mm.Thus, between the relative portion 271 of the 3rd edge part 267 and first boss 32, formed the second air flue Q2.That is, the 3rd edge part 267 in the guard shield 50 is used as the edge part that forms the second air flue Q2.The second air flue Q2 makes cooling air passway M3 and guard shield 50 spatial communication outward in the guard shield 50.And the second air flue Q2 is communicated with the first air flue Q1.Like this, the first and second air flue Q1, Q2 around downstream formation portion 241, have been formed.The part of the cooling air in the cooling air passway M3 is discharged to outside the guard shield 50 through the second air flue Q2.
With reference to Figure 11 and Figure 14,, form the second and the 3rd edge part 266,267 and the exhaust port 250 of the first air flue Q1 and the second air flue Q2 and cylinder head 23 that through hole 59 clips engine main body 21 and by configuration up and down according to said structure.And the first air flue Q1 and the second air flue Q2 and exhaust port 250 and through hole 59 all are configured in the front end of cylindrical portion 51 on vehicle fore-and-aft direction X1 as discharge portion.That is, on vehicle fore-and-aft direction X1, be configured in the forward end of guard shield 50 as the first air flue Q1, the second air flue Q2, exhaust port 250 and the through hole 59 of the discharge portion that is used to discharge the cooling air in the guard shield 50.
Below, the effect of this mode of execution is described.With reference to Fig. 3 and Fig. 5, in case the bent axle 57 of engine main body 21 drives then fan 56 rotations.Thus, extraneous gas is imported to the back space M2 of the cooling air passway M3 in the guard shield 50 by the air input part 58 from guard shield 50 as tempering air.Flowing for example shown in arrow R1 of the extraneous gas of this moment.
The tempering air that is directed among the back space M2 is carried by fan 56 front side to vehicle fore-and-aft direction X1 in cooling air passway M3, forms cooling air.At this moment, shown in arrow R2, mobile the flowing of upper wall 243 and the flowing that is divided into towards the cylindrical portion 51 of guard shield 50 of cooling air towards diapire 245.Thus, cooling air is at the heat that when anterior space M 1 flows, absorbs engine main body 21 from the back space M2 of cooling air passway M3.Shown in the arrow R3 among Fig. 5 and Figure 11, the cooling air that has arrived the bottom of front space M1 is discharged from exhaust port 250 and through hole 59.
With reference to Fig. 5 and Figure 14, shown in arrow R4, the part of cooling air that has arrived the top of front space M1 is discharged to the outside of guard shield 50 from the first air flue Q1 and the second air flue Q2.This cooling air blows to the outer surface of the downstream formation portion 241 of secondary inlet air pathway organizator 41.Thus, the cooling air that has passed through the first air flue Q1 and the second air flue Q2 is from downstream formation portion 241 absorption heats.As a result, the flow through air inlet of downstream K3 of secondary inlet air pathway K1 is directly imported in the jet space G3 under remaining the state of low temperature.
In addition, quilt blows to first boss 32 from the part of the cooling air of the first air flue Q1 and second air flue Q2 discharge.Thus, cooling air also absorbs the heat of first boss 32, thereby cooling is installed in the sparger 34 on first boss 32.
According to this mode of execution, can obtain following effect.That is, engine unit 20 is air cooled engine unit.Therefore, do not need needed radiator in water-cooled engine unit and cooling waterpump.Therefore, can realize the simple structure of engine unit 20.
In addition, adopted the forced air cooling type that comes forcibly to produce cooling air through fan 56.Thus, need engine unit 20 be configured in quilt in the automotive bicycle 200 position that wind arrives of going.Therefore, can improve the degrees of freedom of the layout of the engine unit 200 in the automotive bicycle 200.
And when vehicle driving, fan 56 can produce sufficient cooling air thus with bent axle 57 high speed rotating in guard shield 50.As a result, the cooling air of enough amounts flows to secondary inlet air pathway organizator 41 through the first and second air flue Q1, Q2.Therefore, can come to cool off reliably secondary inlet air pathway organizator 41 through the cooling air of fan 56.Thus, can prevent secondary inlet air pathway K1 heating owing to the heat of engine main body 21.Therefore, can not become high temperature through the auxiliary air of secondary inlet air pathway K1 and the sparger 34 that auxiliary air is flowed through.As a result, can make the temperature of mixed gas of auxiliary air and fuel low, therefore can make the combustion efficiency of fuel high.
In addition, when idle running, air inlet is imported to the jet space G3 from secondary inlet air pathway K1 as auxiliary air at least.Thus, auxiliary air is blown to the fuel that ejects from jet nozzles 35, thereby has promoted the pelletizing of fuel.The combustion efficiency of the fuel in the time of as a result, when idle running and low load being gone is high.And the main inlet air pathway P1 branch in the cylinder 220 of secondary inlet air pathway K1 outside being configured in guard shield 50 comes out.Therefore, the attachment portion that is connected with cylinder 220 at least in the secondary inlet air pathway organizator 41 is configured in the outside of guard shield 50.As a result, whole secondary inlet air pathway K1 is not vulnerable to the influence of the heat in the guard shield 50, thereby can the auxiliary air of the secondary inlet air pathway K1 that flow through still be remained low temperature.Therefore therefore, can come cooling injection device 34, can make the temperature of fuel of the sparger 34 of flowing through low, thereby the combustion efficiency of fuel is further improved through the auxiliary air of low temperature.Like this, when the few idle running of the cooling air that causes fan 56 owing to bent axle 57 low speed rotation, also can make the combustion efficiency of fuel high.
In addition, be disposed at jet nozzles 35 on the cylinder head 23 that becomes easily high temperature owing to heat from firing chamber A1 near dispose downstream formation portion 241.Therefore, downstream formation portion 241 receives the heat of cylinder head 23 easily.But, can come to cool off reliably downstream formation portion 241 through the cooling air that has passed through the first and second air flue Q1, Q2.Therefore, can suppress reliably the to flow through auxiliary air of downstream K3 of secondary inlet air pathway K1 is heated.
And, dispose downstream formation portion 241 in the outside of guard shield 50.Thus, the hot gas of the engine main body 21 in the guard shield 50 is difficult for being delivered to downstream formation portion 241.Therefore, the heat of engine main body 21 is difficult for being delivered to the interior auxiliary air of downstream K3 of secondary inlet air pathway K1.Thus, can suppress auxiliary air more reliably and become high temperature.
In addition, can make cooling air from blowing to downstream formation portion 241 at the relative portion of the second and the 3rd edge part 266,267 of guard shield 50 271,270, the first and second air flue Q1, the Q2 that form between 272 with each.The first and second air flue Q1, Q2 be positioned at downstream formation portion 241 near.Therefore, can make cooling air blow to downstream formation portion 241 reliably.Thus, can suppress more reliably the to flow through auxiliary air of downstream K3 of secondary inlet air pathway K1 is heated.
And, in the guard shield 50 shown in arrow R2 such form from fan 56 towards the cooling air of the first air flue Q1 and the second air flue Q2 flow and from fan 56 flowing towards the cooling air of exhaust port 250 and through hole 59.Cooling air flows with the mode of gripper cylinder lid 23.Therefore, the zone that cooling air is flowed is more, thus cooled engine main body 21 efficiently.And, can suppress and will be attracted to exhaust port 250 and through hole 59 sides from the cooling air of the first air flue Q1 and second air flue Q2 outflow.Therefore, can discharge cooling air reliably and cool off downstream formation portion 241 effectively from the first air flue Q1 and the second air flue Q2.
In addition, between the cylinder 220 of throttle body 38 and cylinder head 23, be connected with connecting tube 39.Thus, can the upstream extremity formation portion 240 of throttle body 38, secondary inlet air pathway organizator 41 be kept apart with the cylinder head 23 of high temperature reliably and dispose.Therefore, can make the heat of cylinder head 23 be difficult for being delivered to the upstream extremity formation portion 240 of secondary inlet air pathway organizator 41.The upstream extremity K2 place auxiliary air that as a result, can be suppressed at secondary inlet air pathway K1 more reliably is by the heat of cylinder head 23.And, can come intercept heat from the transmission of cylinder head 23 through connecting tube 39 to the cylinder 220 of throttle body 38.That is, can be with connecting tube 39 as the heat insulating member between cylinder head 23 and the throttle body 38.
And, disposed the integral body of secondary inlet air pathway organizator 41 than the outside of the inboard low guard shield 50 of guard shield 50 at temperature.Thus, can the auxiliary air in the secondary inlet air pathway organizator 41 be maintained lower temperature.
In addition, guard shield 50 is configured to not cover first boss 32 and sparger 34.Thus, can make guard shield 50 miniaturizations, thereby can make the following side space G1 of vehicle seat 16 bigger.
According to above-mentioned constituted mode, can realize the automotive bicycle simple in structure 200 of engine unit 20.And, owing to engine unit 20 is the pressure cooling type, therefore need not make the wind of going, thereby can make the degrees of freedom height of the layout of the engine unit 20 on the automotive bicycle 200 to engine main body.As a result, can engine unit 20 be configured to surrounded by body cover 18.That is, can apply the present invention to the automotive bicycle 200 of small motor cycle type.And the auxiliary air through low temperature is to the cooling to the auxiliary air in the secondary inlet air pathway organizator 41 of the cooling air of the micronized promotion of fuel and fan 56, in the time of can being implemented in idle running when going all high automotive bicycle 200 of combustion efficiency of fuel.
And, can be with the attitude configuration of engine main body 21 to fall along vehicle fore-and-aft direction X1.Thus, can make the size of the engine main body 21 on the vehicle above-below direction Z1 little.Thus, can make the space between engine main body 21 and the vehicle seat 16 bigger.Therefore, for example can in this space, dispose jumbo storage case, can also avoid the vehicle seat height to become too high in this case.In addition, the cooling air of fan 56 is blown to from the rear end of guard shield 50 until the scope of front end.Thus, can make the cooling air of fan 56 blow to the broad area on the surface of engine main body 21, thus cooled engine main body 21 effectively.
In addition, the engine unit 20 of this mode of execution comprises the guard shield 50 in the zone except at least a portion of cylinder head 23 in engine main body 21 with cylinder head 23, fan 56, the covering engine main body 21 and is installed in the sparger 34 on the part of the outside of guard shield 50 that exposes in the cylinder head 23.And, make the first and second air flue Q1, the Q2 of the external communications of cooling air passway M3 and guard shield 50 between guard shield 50 and the engine main body 21 be formed on sparger 34 near.
According to this structure, guard shield 50 is not the integral body of covering engine main body 21, but the zone except at least a portion of cylinder head 23 in the covering engine main body 21.Therefore, can avoid guard shield 50 to maximize.In addition, a part that is directed to the cooling air in the cooling air space M 3 between guard shield 50 and the engine main body 21 through fan 56 flows out to the outside of guard shield 50 from the first and second air flue Q1, Q2.This cooling air is cooling injection device 34 near the sparger 34 of flowing through the time, and the temperature that therefore can suppress sparger 34 rises.
In addition, exposing on the part of the outside of guard shield 50 in cylinder head 23 is formed with first boss 32 that is used to install sparger 34, between the outer surface of the 3rd edge part 267 of guard shield 50 and first boss 32, is formed with the above-mentioned second air flue Q2.Therefore, the cooling air that flows out from the second air flue Q2 is through near the sparger 34, therefore cooling injection device 34 effectively.
In addition; Cylinder head 23 and sparger 34 are positioned at the front end of the engine main body 21 on the vehicle fore-and-aft direction X1; Fan 56 is configured in the rear end side of the guard shield 50 on the vehicle fore-and-aft direction X1, is used to discharge the exhaust port 250 of the cooling air in the guard shield 50 and the forward end that through hole 59 is configured in the guard shield 50 on the vehicle fore-and-aft direction X1.
According to this structure, it is interior and mobile to the place ahead of vehicle as a whole in guard shield 50 by the cooling air of outside guard shield 50, discharging from the first and second air flue Q1, Q2, exhaust port 250 and through hole 59 to be directed to guard shield 50 from fan 56.The first and second air flue Q1, Q2 are configured in the downstream end of the flow direction of the cooling air in this guard shield 50.Thus, promoted outflow from the cooling air of the first and second air flue Q1, Q2.
In addition, the first air flue Q1 and the second air flue Q2 and exhaust port 250 clip engine main body 21 with through hole 59 and are configured in the position of opposition side up and down.Thus, the cooling air that flows out from the first and second air flue Q1, Q2 is difficult for being attracted to exhaust port 250 and through hole 59 sides.Therefore, cooling air is flowed out from the first air flue Q1 and the second air flue Q2.
In addition, on guard shield 50, be formed with the first open area N1 that the flange 222 of the cylinder head 23 of join domain outer surface, that conduct is connected with the downstream of suction tude 36 that is used for making cylinder head 23 exposes.Thus, the downstream of suction tude 36 can not covered by guard shield 50.Therefore, compare, can make guard shield 50 miniaturizations with the situation that covers the downstream end of main inlet air pathway through guard shield.
In addition, in cylinder head 23, expose the downstream formation portion 241 that on the part of the outside of guard shield 50, is formed with secondary inlet air pathway organizator 41.According to this structure, secondary inlet air pathway organizator 41 is connected with cylinder head 23 in the outside of guard shield 50.Therefore, compare, can make guard shield 50 miniaturizations with the situation of the downstream formation portion 241 that covers secondary inlet air pathway organizator 41 through guard shield.
In addition, downstream formation portion 241 is formed near the position of the first and second air flue Q1, Q2, the downstream formation portion 241 that therefore can cool off secondary inlet air pathway organizator 41 through the cooling air that flows out from the first and second air flue Q1, Q2.Thus, the oxygen concentration of having avoided quilt to be fed to the auxiliary air of jet space G3 from secondary inlet air pathway K1 descends owing to temperature rises, thereby can make combustion efficiency high.
With reference to Fig. 5 and Fig. 9, next the protective gear 53 that forms with guard shield 50 is described.Protective gear 53 is used to cover the outer surface on right side of the rear end side part of outlet pipe 43.Protective gear 53 is from the outstanding downwards shape of the lower limb of the main board portion 247 of side plate 52.
Open the guard shield that discloses in the 2008-190425 communique as the unit of cooled engine main body the Japanese documentation spy.But, on this guard shield, be not formed for covering the protective gear of outlet pipe and baffler.Therefore, if protective gear is set, then number of components can increase.In contrast, in this mode of execution, because protective gear 53 and guard shield 50 are formed, so number of components is few.
In addition, protective gear 53 be configured in fan 56 near.Thus, can be contacted with the surface of protective gear 53 by the part of the extraneous gas of fan 56 suctions.Thus, the temperature that has suppressed protective gear 53 rises.And,, therefore can not make protective gear 53 bootlessly too big owing to make protective gear 53 become the shape with the length direction almost parallel of outlet pipe 43.Thus, avoided guard shield 50 to maximize.
< mode of execution two >
Figure 15 is the partial section of the major component of another embodiment of the present invention.In this mode of execution, the difference of main explanation and above-mentioned mode of execution about the structure identical with above-mentioned mode of execution, marks identical label in the drawings and omits relevant explanation.
With reference to Figure 15, in this mode of execution, the downstream formation portion 241 of secondary inlet air pathway organizator 41 is configured in the inboard of guard shield 50.Specifically, guard shield 50 also comprises the cover 275 on the upper wall 243 that is fixed on cylindrical portion 51.Cover 275 is independent of half member 54L, 54R (not shown half member 54L) and forms.This cover 275 is positioned at the upside of upper wall 243.
Cover 275 comprises second lid 277 of first lid 276 and the rear side that is configured in first lid 276.
The place ahead that first lid 276 is configured in first boss 32 covers first boss 32, fixture 33, sparger 34 and downstream formation portion 241 from the front side.Second lid 277 is for example when when vehicle fore-and-aft direction X1 observes, being reverse U shape.The front end of second lid 277 is connected with first lid 276.Second lid 277 from the right side, upside and left side cover first boss 32, fixture 33, sparger 34 and downstream formation portion 241.
Inboard at second lid 277 is formed with the upper space M4 as the part of cooling air passway M3.Upper space M4 is communicated with front space M1.In addition, be formed with the 3rd air flue Q3 between the other end 237a of the flexible pipe 237 of adjacent portion 243a in second lid, 277 rearward end 277a, upper wall 243 and rearward end 277a adjacency, downstream formation portion 241.The 3rd air flue Q3 be formed on downstream formation portion 241 around, be communicated with cooling air passway M3 and guard shield 50 space outward.The 3rd air flue Q3 can discharge cooling air.
The cooling air of discharging from the first and second air flue Q1, Q2 blows to downstream formation portion 241 such upper space M4 in cover 275 shown in arrow R4, afterwards such rear that is discharged to cover 275 from the 3rd air flue Q3 shown in arrow R5.
According to this mode of execution, the inboard of the cover 275 of the guard shield 50 that flows at cooling air disposes downstream formation portion 241.Thus, can make the cooling air of fan 56 blow to downstream formation portion 241 reliably.Therefore, can come to suppress reliably downstream formation portion 241 and its inner auxiliary air by the heat of engine main body 21 through cooling air.
< other mode of executions >
The invention is not restricted to the mode of execution that is illustrated through above-mentioned record and accompanying drawing.For example, following mode of execution is also included within the technical scope of the present invention.
(1) cylinder head that guard shield also can the covering engine main body is whole.
(2) be not limited to the mode that cooling air blows to the downstream formation portion of secondary inlet air pathway organizator.Cooling air also can blow to the random position of secondary inlet air pathway.
(3) also can prepare to be independent of guard shield and the wind guide component that forms, and make the cooling air of discharging blow to secondary inlet air pathway organizator from guard shield through this wind guide component.
(4) also can with exhaust port be configured in first air flue and second air flue near.
(5) also can cancel one of first air flue and second air flue.
(6) also can at least a portion except upstream extremity formation portion in the secondary inlet air pathway organizator be configured in the guard shield.
(7) cylinder head and fuel injection system both can be configured in the intermediate portion of engine main body on the vehicle fore-and-aft direction, also can be configured in rearward end.Equally, fan gets final product with bent axle is coaxial, on the vehicle fore-and-aft direction, both can be configured in the intermediate portion of engine main body, also can be configured in front end.
(8) engine unit need can be not supported around pivot swinging ground with respect to vehicle body frame, can be fixed on the vehicle body frame yet.
(9) secondary inlet air pathway organizator is not limited to be independent of the mode that suction tude forms.Secondary inlet air pathway organizator also can form with the parts of formation suction tude such as connecting tube.
(10) also can be with the gap between the outer surface of the edge part of the front end of guard shield and sparger as the air flue of discharging cooling air.In addition, also can the position formation on guard shield run through the hole portion of form, and make this hole portion performance discharge the function of the air flue of cooling air near sparger.
It is distolateral that the air flue of (11) discharging cooling air both can be configured in the upper reaches of the cooling air passway in the guard shield, also can be configured in the roughly neutral position of upstream extremity and downstream.
(12) protective gear also can be the parts that are independent of guard shield.
(13) protective gear also can be configured in the position of having left drawing fan.
(14) protective gear also can be the form of the integral body of the form of the part of the form of the part of the form that covers the integral body of outlet pipe, a part that covers outlet pipe and baffler, the integral body that covers outlet pipe and baffler, the integral body that covers outlet pipe and baffler, a part that covers baffler or the arbitrary form in the whole form.
(15) secondary inlet air pathway organizator as long as form the secondary inlet air pathway that connects between first and second throttle valve and be formed on the jet space on the cylinder head can be and above-mentioned mode of execution various structure.For example, also can omit the 3rd boss, and the other end of flexible pipe is embedded in the 4th boss and fixes.In addition, also can omit the 4th boss, on first boss, form recess, and be embedded in this recess the 3rd boss also fixing.In addition, also can on the cylinder of throttle body, form recess, and in this recess the fixing end of flexible pipe.
(16) engine unit also can be loaded on other vehicles beyond the automotive bicycle.All-terrain vehicle), ski type motorbike Straddle-type vehicles such as (sonwmobile) as this vehicle, can illustration go out ATV (All Terrain Vehicle:.
Claims (10)
1. forced air-cooled vehicle engine unit comprises:
Engine main body, this engine main body comprise the crankcase that holds bent axle, connect and hold the cylinder block of the piston that can move back and forth and form the firing chamber with said cylinder block and form the cylinder head of the part of the main inlet air pathway that is connected with said firing chamber with said crankcase;
Suction tude is connected with said cylinder head, and forms said main inlet air pathway with said cylinder head;
Guard shield covers the part of said cylinder head at least;
Fan is configured between said guard shield and the said engine main body, is driven and produce the cooling air that is used to cool off said engine main body through the rotation of said bent axle;
Throttle body; This throttle body is included in devices spaced apart on the flow direction of the inherent air inlet of said suction tude and two throttle valve disposing and form the part of said suction tude and hold the cylinder of said two throttle valve, and this throttle body is arranged on outside the said guard shield;
Fuel injection system is installed on the said cylinder head, and has the jet nozzles of the said main inlet air pathway burner oil in said cylinder head; And
Secondary inlet air pathway organizator; Be formed between said two throttle valve from said main inlet air pathway branch come out and at least when the idle running with the secondary inlet air pathway of said air inlet to the jet space guiding that is formed on the said jet nozzles on the said cylinder head, and on the part of the periphery of said secondary inlet air pathway organizator, formed the space that is communicated with in the said guard shield and the air flue in the space outside the said guard shield at least.
2. forced air-cooled vehicle engine unit as claimed in claim 1, wherein,
Said secondary inlet air pathway comprises upstream extremity that is connected with said main inlet air pathway and the downstream that is connected with the said jet space of said jet nozzles,
The downstream formation portion that said secondary inlet air pathway organizator comprises the upstream extremity formation portion that forms said upstream extremity and forms said downstream,
Said cooling air is at least by to the guiding of said downstream formation portion.
3. forced air-cooled vehicle engine unit as claimed in claim 2, wherein,
Said cylinder head comprises the boss that exposes outside said guard shield and hold said jet nozzles,
The said downstream formation portion of said secondary inlet air pathway organizator comprises said boss.
4. forced air-cooled vehicle engine unit as claimed in claim 3, wherein,
Said guard shield comprises edge part, between the outer surface of said edge part and said downstream formation portion, forms said air flue.
5. forced air-cooled vehicle engine unit as claimed in claim 4, wherein,
Be used for exhaust port that said cooling air is discharged being formed with on the said guard shield outside said guard shield,
Said edge part and said exhaust port clip said cylinder head configuration.
6. forced air-cooled vehicle engine unit as claimed in claim 1, wherein,
Said suction tude comprises the connecting tube that connects said cylinder and said cylinder head.
7. forced air-cooled vehicle engine unit as claimed in claim 1, wherein,
The configured in one piece of said secondary inlet air pathway organizator is outside said guard shield.
8. forced air-cooled vehicle engine unit as claimed in claim 2, wherein,
Said downstream formation portion is configured in the inboard of said guard shield.
9. automotive bicycle comprises:
Vehicle body frame extends upward in the vehicle front and back;
Vehicle seat is supported by said vehicle body frame;
Foot treadle is configured in the place ahead of said vehicle seat;
Body cover erects to the top from the rear portion of said foot treadle, and surrounds the following side space of said vehicle seat; And
Each described forced air-cooled vehicle engine unit in the claim 1 to 8; It is supported by said vehicle body frame and is configured to and can on the vehicle above-below direction, swings, and the below that said engine unit is arranged on said vehicle seat is covered by said body cover.
10. automotive bicycle as claimed in claim 9, wherein,
Said cylinder head and said fuel injection system are positioned at the front end of said engine main body on the vehicle fore-and-aft direction,
Said fan is configured in the rear end side of said guard shield on said vehicle fore-and-aft direction,
The discharge portion that is used to discharge the cooling air in the said guard shield is configured in the forward end of said guard shield on said vehicle fore-and-aft direction.
Applications Claiming Priority (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008190450 | 2008-07-24 | ||
| JP2008-190450 | 2008-07-24 | ||
| JP2008190450 | 2008-07-24 | ||
| JP2009042957 | 2009-02-25 | ||
| JP2009-042957 | 2009-02-25 | ||
| JP2009042957 | 2009-02-25 | ||
| JP2009-042922 | 2009-02-25 | ||
| JP2009042922 | 2009-02-25 | ||
| JP2009042922 | 2009-02-25 | ||
| JP2009114018A JP2010223211A (en) | 2008-07-24 | 2009-05-08 | Forced air-cooled engine unit for vehicle and motorcycle |
| JP2009114018 | 2009-05-08 | ||
| JP2009-114018 | 2009-05-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101634243A CN101634243A (en) | 2010-01-27 |
| CN101634243B true CN101634243B (en) | 2012-06-06 |
Family
ID=41592762
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910161220 Expired - Fee Related CN101633381B (en) | 2008-07-24 | 2009-07-24 | Motorcycle |
| CN 200910160185 Expired - Fee Related CN101633388B (en) | 2008-07-24 | 2009-07-24 | Automatic tumbrel |
| CN 200910161224 Expired - Fee Related CN101634243B (en) | 2008-07-24 | 2009-07-24 | Forced air-cooled vehicle engine unit, and automatic motorcycle |
| CN 200910161226 Expired - Fee Related CN101634270B (en) | 2008-07-24 | 2009-07-24 | Vehicle engine unit, and straddle-type vehicle |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910161220 Expired - Fee Related CN101633381B (en) | 2008-07-24 | 2009-07-24 | Motorcycle |
| CN 200910160185 Expired - Fee Related CN101633388B (en) | 2008-07-24 | 2009-07-24 | Automatic tumbrel |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910161226 Expired - Fee Related CN101634270B (en) | 2008-07-24 | 2009-07-24 | Vehicle engine unit, and straddle-type vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (4) | CN101633381B (en) |
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| JP5819202B2 (en) * | 2012-01-11 | 2015-11-18 | 本田技研工業株式会社 | Saddle riding |
| JP2013151885A (en) * | 2012-01-24 | 2013-08-08 | Yamaha Motor Co Ltd | Internal combustion engine and straddle-type vehicle provided with internal combustion engine |
| JP2013151886A (en) | 2012-01-24 | 2013-08-08 | Yamaha Motor Co Ltd | Internal combustion engine and straddle-type vehicle provided with internal combustion engine |
| CN103359213B (en) * | 2012-03-30 | 2015-12-02 | 雅马哈发动机株式会社 | Straddle type vehicle |
| JP6056285B2 (en) * | 2012-09-06 | 2017-01-11 | スズキ株式会社 | Scooter type vehicle |
| JP6002648B2 (en) * | 2013-09-30 | 2016-10-05 | 本田技研工業株式会社 | Throttle body |
| JP6144233B2 (en) * | 2014-06-03 | 2017-06-07 | 愛三工業株式会社 | Throttle valve control device for vehicle |
| CN108779736B (en) * | 2016-03-09 | 2020-10-27 | 本田技研工业株式会社 | Intake structure of internal combustion engine |
| MX2018001383A (en) * | 2017-02-01 | 2018-11-29 | Tvs Motor Co Ltd | Cooling system for internal combusion engine. |
| JP6448692B2 (en) * | 2017-03-16 | 2019-01-09 | 本田技研工業株式会社 | On-vehicle structure of air-cooled internal combustion engine |
| JP6916049B2 (en) * | 2017-06-22 | 2021-08-11 | 株式会社ミクニ | General-purpose engine |
| CN107575317B (en) * | 2017-08-09 | 2019-11-26 | 浙江吉利新能源商用车有限公司 | A kind of temperature control method and system of vehicle motor |
| WO2019035389A1 (en) * | 2017-08-17 | 2019-02-21 | ヤマハ発動機株式会社 | Internal-combustion engine and saddle-type vehicle |
| US10647175B2 (en) * | 2017-11-14 | 2020-05-12 | Cummins Inc. | Dynamic fan speed control for aerodynamic drag reduction |
| JP6614518B1 (en) * | 2018-06-28 | 2019-12-04 | 井関農機株式会社 | Combiner power structure |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101634243A (en) | 2010-01-27 |
| CN101633381B (en) | 2011-07-06 |
| CN101634270B (en) | 2012-01-04 |
| CN101633388A (en) | 2010-01-27 |
| CN101633388B (en) | 2012-09-05 |
| CN101633381A (en) | 2010-01-27 |
| CN101634270A (en) | 2010-01-27 |
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