CN101633388B - Automatic tumbrel - Google Patents

Abstract

The invention provides a tumbrel which has improved fuel combustion efficiency, large accommodating space and can deal with the foreign matters such as slush. An engine unit (20) is configured under the accommodating tank. The engine unit (20) includes an air inlet pipe (36) connected with a cylinder cover and a throttle valve body (38) on top of the engine main body (21). The air inlet pipe (36) is provided with a first throttle valve (40A) and a second throttle valve (40 B) and a linkage mechanism (227) linking the valves (40A, 40B). The engine unit (20) is provided with a lower cover part (334). A face (347) of the lower cover part (334) is opposite to the linkage mechanism (227) between the linkage mechanism (227) and the engine main body (21), is inclined in at least one direction of the left and right direction (Y1) and the back and forth direction (X1) corresponding to vehicles and discharges the foreign matters such as slush dropped on the face (347).

Description

Automatic two-wheeled cycle

Technical field

The present invention relates to have the automatic two-wheeled cycle of throttle valve body.

Background technology

As patent documentation 1 is put down in writing, have driving engine, vehicle body cover, main free air diffuser, throttle valve body and secondary free air diffuser in some automatic two-wheeled cycle.

Above-mentioned driving engine for example is the integrated oscillating type driving engine that is configured in below-seat.The integrated oscillating type driving engine can be with respect to vehicle body around pivot swinging.Above-mentioned vehicle body cover covers the below of vehicle seat.Above-mentioned main free air diffuser is used air to driving engine supply air inlet.Above-mentioned throttle valve body is configured in main free air diffuser midway, and wherein the section of accommodating carries out two flow regulating valve of on-off action.Above-mentioned secondary free air diffuser couples together with the space between two flow regulating valve and near being installed in the injection orifice of the eductor on the cylinder head of driving engine.

At least when tickover, come the air inlet of autonomous free air diffuser in secondary free air diffuser, to flow as additional air.Additional air is blown to from the eductor injected fuel, promotes the micronize of fuel.The combustion efficiency of fuel when thus, improving tickover at least.

In addition, at least a portion of eductor is accommodated in the cylinder head.Through formation like this, compare when being installed in eductor on the air inlet pipe, can reduce to dispose the needed space of eductor.Therefore, can further enlarge the space under the vehicle seat.Consequently, can further increase the volume of the storage case under the vehicle seat.

In addition, be provided with the connecting rod mechanism that is used to open and close two flow regulating valve in the throttle valve body.Connecting rod mechanism comprises two main link component.Two main link component make two flow regulating valve carry out on-off action through swinging around two oscillating axles of approximate horizontal.In addition, connecting rod mechanism has the auxiliary connecting rod parts that link two main link component.The auxiliary connecting rod parts are positioned at the position of more leaning on the below than oscillating axle, and swing with two main link component interlocks.

Patent documentation 1: International Publication WO2004/38213 communique.

Summary of the invention

In the automatic two-wheeled cycle of patent documentation 1, front-wheel or trailing wheel splash the mud or the water that come and may get in the driving engine.Therefore, in order to ensure the work of connecting rod mechanism, this connecting rod mechanism is configured in from engine main body top enough far away.

But if with from the far state configuration connecting rod mechanism of engine main body, then when configuration storage case between vehicle seat and engine main body, the volume of storage case will diminish.

Can consider on the one hand connecting rod mechanism and engine main body to use to cover in order to suppress mud and water arrival connecting rod mechanism on the other hand to cover connecting rod mechanism integral body near configuration.Yet if use cover to cover connecting rod mechanism integral body, it is big that cover will become, and the space that is used for storage case can diminish thereupon.

In addition, it is said that some is equipped with the automatic two-wheeled cycle such as the patent documentation 1 of integrated oscillating type driving engine, is formed with the free air diffuser that links to each other and rearward extend with the upper surface of driving engine.In this automatic two-wheeled cycle, free air diffuser is configured in the below of storage case, therefore is difficult to increase the configuration space of storage case.

Therefore; The objective of the invention is to; A kind of automatic two-wheeled cycle that the integrated oscillating type driving engine is installed and is formed with the free air diffuser that links to each other with the upper surface of driving engine and rearward extend is provided; This automatic two-wheeled cycle can improve the combustion efficiency of fuel, guarantees big spatial accommodation, and has also taked sufficient countermeasure to foreign matters such as mud and water.

The means that are used to deal with problems

Automatic two-wheeled cycle of the present invention comprises: the upwardly extending body shell in the vehicle front and back; By the vehicle seat of said body shell supporting; Be configured in the storage case of the following side space of said vehicle seat; Be configured in said vehicle seat the place ahead put sole; Engine unit, this engine unit is supported by said body shell with the state that can on above-below direction, swing, and is configured in the below of the said storage case in the said side space down; And the longitudinal wall parts that define the front end of said following side space.Said engine unit comprises: engine main body, and this engine main body comprises cylinder head, this cylinder head also constitutes the part with said combustion chamber bonded assembly master free air diffuser in a part that forms combustion chamber; Air inlet pipe, this air inlet pipe is connected with said cylinder head, and forms said main free air diffuser with said cylinder head; Throttle valve body, this throttle valve body is configured in the top of said engine main body, and has the first throttle valve and second flow regulating valve, and said first throttle valve and said second flow regulating valve are configured in to devices spaced apart in the said air inlet pipe on the flow direction of air inlet; Fuel Injection Device, this Fuel Injection Device is installed on the said cylinder head, and has the injection cock of the said main free air diffuser burner oil in said cylinder head; Secondary free air diffuser organizator; This pair free air diffuser organizator forms secondary free air diffuser, and this pair free air diffuser divides expenditure and said air inlet imported to the jet space during at least at tickover from said main free air diffuser between said first throttle valve and said second flow regulating valve; Connecting rod mechanism, this connecting rod mechanism is configured in the top of said engine main body, and is connected with said second flow regulating valve so that said first throttle valve and the said second flow regulating valve interlock with said first throttle valve; And following cap assembly, this time cap assembly is relative and have with respect at least one the direction bevelled face in left and right vehicle wheel direction and the said vehicle fore-and-aft direction with said connecting rod mechanism between said connecting rod mechanism and said engine main body.

The invention effect

According to automatic two-wheeled cycle of the present invention; A kind of automatic two-wheeled cycle that the integrated oscillating type driving engine is installed and is formed with the free air diffuser that links to each other with the upper surface of driving engine and rearward extend can be provided; This automatic two-wheeled cycle can improve the combustion efficiency of fuel; Guarantee big spatial accommodation, and also taked sufficient countermeasure to foreign matters such as mud and water.

Description of drawings

Fig. 1 is the right elevation of the automatic two-wheeled cycle of embodiment of the present invention 1;

Fig. 2 is that right elevation is amplified in the part of the automatic two-wheeled cycle of vehicle body cover periphery;

Fig. 3 is the section drawing of the part of engine unit, wherein shows the state of overlooking engine unit;

Fig. 4 is the longitudinal section of the main portion of engine unit, wherein shows the state of observing engine unit from the right side;

Fig. 5 is the right elevation that a part is broken the engine unit that illustrates, and the long and two-short dash line that wherein is used as imaginary line shows this part;

Fig. 6 is the right elevation of the main portion of schematically illustrated throttle valve body periphery, wherein shows the cross section of a part;

Fig. 7 is the birds-eye view that a part is broken the main portion of the throttle valve body periphery that illustrates;

Fig. 8 is the section drawing along the main portion of the VIII-VIII line of Fig. 6;

Fig. 9 is the schematic right elevation of the first throttle valve and second flow regulating valve throttle valve body when being in full-gear;

Figure 10 is the figure of relation of aperture that aperture and second flow regulating valve of first throttle valve are shown;

Figure 11 is the enlarged drawing of the following cap assembly periphery of Fig. 6;

Figure 12 is the enlarged drawing of the following cap assembly periphery of Fig. 7;

Figure 13 is the enlarged drawing of the following cap assembly periphery of Fig. 8;

Figure 14 is the section drawing along the main portion of the XIV-XIV line of Figure 12;

Figure 15 is the section drawing along the main portion of the XV-XV line of Figure 12;

Figure 16 is the section drawing along the main portion of the XVI-XVI line of Figure 13;

Figure 17 is the section drawing along the main portion of the XVII-XVII line of Figure 13;

Figure 18 is the right elevation of the main portion of another embodiment of the present invention, wherein shows the cross section of a part;

Figure 19 is the section drawing of the part of the observed main portion of rear side from the vehicle fore-and-aft direction;

Figure 20 is the section drawing of the part of the main portion of the another embodiment of observation the present invention from the right side;

Figure 21 is the section drawing from the main portion of the another embodiment of left sides the present invention.

The specific embodiment

< realizing the process of the application's invention >

The present inventor is for the integrated oscillating type driving engine being installed and being formed with the automatic two-wheeled cycle of the free air diffuser that links to each other with the upper surface of driving engine and rearward extend; Researched and developed for the combustion efficiency that improves fuel two flow regulating valve, secondary free air diffuser and connecting rod mechanism have been set, and increased the structure of the volume of the storage case under the vehicle seat as much as possible.

In the automatic two-wheeled cycle of aforesaid way, owing to equally with the automatic two-wheeled cycle of patent documentation 1 said mode between driving engine and storage case, dispose free air diffuser, thereby be difficult to guarantee the volume of storage case.

Particularly in the integrated oscillating type driving engine, except that driving engine, throttle valve body and connecting rod mechanism also swing up and down around pivot with respect to body shell.Therefore, need be used for the space that throttle valve body and connecting rod mechanism etc. swing up and down with respect to body shell, thereby be difficult to guarantee the volume of storage case.Therefore, considered through driving engine, throttle valve body and connecting rod mechanism are increased the volume of storage case near configuration.Yet if driving engine and connecting rod mechanism are too approaching, the muddy water of heading driving engine etc. is attached on the connecting rod mechanism easily.

The present inventor notices that the automatic two-wheeled cycle of aforesaid way is the same with the automatic two-wheeled cycle of patent documentation 1 said mode, and the longitudinal wall that mud that is splash by front-wheel and water are formed by body shell and storage case stops, is difficult to arrive engine unit.Therefore, as long as consider countermeasure to foreign matters such as mud of rolling by trailing wheel and water.

In addition,, the present inventor may get into the space under the vehicle seat, near these muddy water mainly arrive throttle valve body from the top though noticing the muddy water of being rolled by trailing wheel.Therefore, as long as consider, just enough to the work of guaranteeing connecting rod mechanism to countermeasure from last and next foreign matters such as muddy water.

The present inventor has found out the above-mentioned fact and has accomplished the application's invention.

< embodiment 1 >

Below, with reference to accompanying drawing the specific embodiment of the present invention is described.Front and back in the following explanation, up and down and about etc. all directions be with automatic two-wheeled cycle be in be equivalent to the benchmark posture of the state of keeping straight on forward on the horizontal surface and chaufeur during towards the place ahead the viewpoint of this chaufeur be the benchmark definition.

In addition, in each accompanying drawing, represent the place ahead of automatic two-wheeled cycle with arrow F.Likewise, in each accompanying drawing, represent the rear of automatic two-wheeled cycle with arrow B; The top of representing automatic two-wheeled cycle with arrow U; Represent the below of automatic two-wheeled cycle, to represent the right-hand of automatic two-wheeled cycle with arrow D with arrow R with the left that arrow L representes automatic two-wheeled cycle.

Fig. 1 is the right elevation of the automatic two-wheeled cycle 200 of embodiment of the present invention 1.In Fig. 1, break a part that shows automatic two-wheeled cycle 200.In this embodiment, automatic two-wheeled cycle 200 is motor scooter (scooter).In this embodiment, the example of motor scooter as automatic two-wheeled cycle of the present invention described, but automatic two-wheeled cycle of the present invention is not limited thereto.The part that the present invention can also be applied to antetheca and the storage case of vehicle body cover is configured in other the automatic two-wheeled cycle in the place ahead of engine unit as the longitudinal wall parts.

Handlebar 10 is configured in the front portion of automatic two-wheeled cycle 200.Handlebar 10 links with front-wheel 14 via the steering shaft 13 of inserting logical head pipe 11.Head pipe 11 combines with body shell 15.

Body shell 15 is formed in vehicle fore-and-aft direction X1 as a whole and goes up the shape of extending.The leading section of body shell 15 combines with head pipe 11.At the rear portion of body shell 15 vehicle seat 16 is installed.Put sole 17 and be installed in the more forward position of ratio vehicle seat 16 on the body shell 15.Put sole 17 be positioned at than vehicle seat 16 more by under the position.

In addition, vehicle body cover 18 is installed on body shell 15.Vehicle body cover 18 constitutes the shape that upwards erects from the rear portion of putting sole 17, and surrounds the following side space G1 of vehicle seat 16.

Amplify shown in the right elevation like the part of Fig. 2, vehicle body cover 18 is formed the following side space G1 that surrounds vehicle seat 16.This vehicle body cover 18 comprises: the antetheca 202 as the longitudinal wall parts that is configured in the leading section below of vehicle seat 16; And the pair of sidewalls 203 of below that is configured in right part and the left part of vehicle seat 16.But in Fig. 2, only show the sidewall 203 on right side in the pair of sidewalls 203.Pair of sidewalls 203 left and right symmetricallies form.Antetheca 202 has defined the place ahead of the following side space G1 under the vehicle seat 16.

The engine unit 20 of integrated oscillating type is installed on body shell 15.Engine unit 20 is the engine unit of forced air cooling type.The part of engine unit 20 is covered by vehicle body cover 18.Particularly, the front of the front of the engine main body that will be explained below 21 of engine unit 20 and guard shield 50 is covered by vehicle body cover 18.Engine unit 20 is configured in the below of vehicle seat 16 and storage case 301.

As being clearly shown that more among Fig. 1, engine unit 20 comprises: engine main body 21, air inlet pipe 36, throttle valve body 38, secondary free air diffuser organizator 41 and guard shield 50.

Engine main body 21 is configured in the rear of the antetheca 202 of vehicle body cover 18 in the following side space G1 of vehicle seat 16.

Fig. 3 is the section drawing of the part of engine unit 20, shows the state of overlooking engine unit 20.That is, show the horizontal section of 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 motors.Engine main body 21 comprises: cylinder block 22; Be installed in the cylinder head 23 of the leading section of cylinder block 22; And the crankcase 24 that is installed in the rearward end of cylinder block 22.

Fig. 4 is the longitudinal section of the main portion of engine unit 20, wherein shows the state of observing engine unit 20 from right flank.Fig. 5 is the right elevation that a part is broken the engine unit 20 that illustrates, and the long and two-short dash line that wherein is used as imaginary line shows this part.In each accompanying drawing, imaginary line illustrates with long and two-short dash line.

With reference to figure 3 and Fig. 5, the guard shield 50 that is used for cooled engine main body 21 is installed on engine main body 21.Guard shield 50 comprises: cylindrical portion 51, and it surrounds entire cylinder body 22 on the whole circumference of cylinder block 22, and on the whole circumference as the rearward end 207 of the part of cylinder head 23, surrounds this rearward end 207; Side plate 52, its right side from crankcase 24 coats crankcase 24; And backplate 53.

Cylindrical portion 51 has the upper wall 243 of the top that is configured in engine main body 21.The part of the upper surface of the upper surface of upper wall 243 coating gas cylinder bodies 22 and the rearward end 207 of cylinder head 23.

Crankcase 24 has constituted the rearward end of engine main body 21.The bent axle 57 that extends to left and right vehicle wheel direction Y1 is accommodated in the crankcase 24.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 24.Fan 56 is attached on the right part 204 of bent axle 57, and can rotate with bent axle 57 one.Fan 56 is driven through the rotation of bent axle 57.Fan 56 absorbs the outside of air from guard shield 50 for cooled engine main body 21, and air is imported in the guard shield 50 as cooling air.In addition, the big end parts of connecting rod 205 is connected the centre portion of bent axle 57.

Cylinder block 22 is the barrel-contoured parts that are connected on the front end face 206 of crankcase 24.Space in the cylinder block 22 is made as the E1 of cylinder chamber.In the E1 of cylinder chamber, accommodate the piston 208 that can move back and forth along cylinder-bore axis.Piston 208 partly links via the small end of piston pin 29 with connecting rod 205.

Cylinder head 23 is connected with the front end face of cylinder block 22, has constituted the leading section of engine main body 21.In cylinder head 23, accommodate the camshaft 209 that is used to drive air inlet valve (not shown) and blow off valve 31.

As shown in Figure 1, crankcase 24 links via pivot 25 with body shell 15.The axis of pivot 25 extends along left and right vehicle wheel direction Y1.In addition, trailing wheel 27 is installed in the rear portion of engine unit 20 via power transfering part 26.In addition, between the rear portion of the rear portion of power transfering part 26 and body shell 15, rear shock absorber 28 is installed.Through as above constituting, engine unit 20 can be swung pivot 25 with respect to body shell 15 as center of oscillation with trailing wheel 27 on above-below direction.

With reference to figure 4, the space that is contained between piston 29, cylinder block 22 and the cylinder head 23 in the cylinder block 22 is combustion chamber A1, and miscellaneous gas is in the internal-combustion of this combustion chamber A1.Cylinder head 23 is provided with the air inlet valve 210 and above-mentioned blow off valve in the face of combustion chamber A1.

With reference to figure 4 and Fig. 5, be provided with barrel-contoured first boss 32 on the right flank top of cylinder head 23.First boss 32 is integrally formed 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 projection 32 is positioned at the outside of guard shield 50, and exposes from guard shield 50.The inner space of first boss 32 is communicated with the main free air diffuser P1 that will be explained below of air inlet valve 210 peripheries.

The eductor 34 of the jetting system that acts as a fuel is installed via the fixer 33 of synthetic resin on first boss 32.Eductor 34 is installed on the cylinder head 23, therefore is positioned at the front end of engine main body 21.

With reference to figure 4, fixer 33 comprises cylindrical portion 211 and the flange part 212 that is arranged on the cardinal extremity place of cylindrical portion 211.The top butt of the flange part 212 and first boss 32.Thus, fixer 33 is positioned with respect to first boss 32.Cylindrical portion 211 is accommodated among the spatial accommodation H1 of the inboard that is formed at first boss 32.Thickly sealed by first sealing element, 214 liquid such as O rings between the outer peripheral face of the base end part 213 of cylindrical portion 211 and the inner peripheral surface of first boss 32.Between the inner peripheral surface of the outer peripheral face of the pars intermedia 215 of cylindrical portion 211 and first boss 32, be formed with chamber G2 as the circular clearance.The top edge of the top ends 216 of cylindrical portion 211 and the inner peripheral surface of first boss 32 are basically seamlessly chimeric.

The inner space of the top ends 216 of cylindrical portion 211 is the jet space G3 as near the space the injection cock 35 of eductor 34.Jet space G is formed on the cylinder head 23, and is communicated with combustion chamber A1 via air inlet valve 210.On the top ends 216 of cylindrical portion 211, be formed with a plurality of through holes 217.A plurality of (for example four) through hole 217 the top ends 216 of cylindrical portion 211 circumferentially on equally spaced form.Chamber G2 is communicated with through these through holes 217 with jet space G3.

Eductor 34 is used for the fuel to free air diffuser burner oil jar (not shown).This eductor 34 comprises: the injector body 218 with elongated shape; And be configured in the injection cock 35 on the top of injector body 218.

Injection cock main body 218 is inserted the cylindrical portion 211 of wearing fixer 33 and is kept by this fixer 33.Roughly half part of the length direction of injector body 218 is accommodated in first boss 32.Thickly sealed by second sealing element, 219 liquid such as O rings between the inner peripheral surface of the outer peripheral face of injector body 218 and fixer 33.Injection cock 35 is in the face of jet space G3, and be configured to via the main free air diffuser P1 in the cylinder head 23 to air inlet valve 210 burner oils towards.(Engine Control Unit: control unit of engine, be also referred to as Electronic Control Unit: electronic control unit) control by not shown ECU by equal controller to the correct time of air inlet valve 210 burner oils for eductor 34.

Air inlet pipe 36 comprises: air inlet is with flexible pipe 37, and it is connected and is configured to and forwards extend with airfilter (omitting diagram); Cylindrical body 220 cylindraceous, it is connected with the leading section of air inlet with flexible pipe 37; And connection pipe 39, its leading section with cylindrical body 220 is connected, and downwarping.

On cylinder head 23, be formed with barrel-contoured admission port 221.Formed the main free air diffuser P1 in the cylinder main body 21 through admission port 221.End at admission port 221 disposes air inlet valve 210.The other end of admission port 221 opens wide to the upper surface of cylinder head 23.The other end of this admission port 221 is formed by the flange 222 that is formed on the cylinder head 23.This flange 222 docks mutually with the flange 223 of the leading section that is formed on connection pipe 39, and uses not shown bolt of rear end plate to fix.Thus, admission port 221 connects with the leading section (that is the downstream end of air inlet pipe 36) of connection pipe 39.

Admission port 221 through cylinder head 23 has formed main free air diffuser P1 with air inlet pipe 36.

Throttle valve body 38 comprises above-mentioned cylindrical body 220 and as the first and second flow regulating valve 40A, the 40B of two flow regulating valve.The central axis S1 of cylindrical body 220 extends along vehicle fore-and-aft direction X1.Cylindrical body 220 is configured in the top of the cylinder block 22 of engine main body 21.In addition, cylindrical body 220 is configured in the top of upper wall 243 of the cylindrical portion that will be explained below 51 of guard shield 50.Thus, whole throttle valve body 38 is configured in the outside of guard shield 50.

The first and second flow regulating valve 40A, 40B are respectively applied for the main free air diffuser P1 that opens and closes in the air inlet pipe 36.Devices spaced apart on the flow direction C1 of first throttle valve 40A and the air inlet of the second flow regulating valve 40B in main free air diffuser P1 and disposing.The first throttle valve 40A and the second flow regulating valve 40B are accommodated in the cylindrical body 220.On the flow direction C1 of air inlet, first throttle valve 40A is configured in than the second flow regulating valve 40B and more leans on the position in downstream.That is, between the second flow regulating valve 40B and cylinder head 23 of first throttle valve 40 in main free air diffuser P1.The first throttle valve 40A and the second flow regulating valve 40B form discoideus respectively.

First throttle valve 40A is by 224 supportings of first S. A., and this first S. A. 224 vertically extends with the central axis S1 of cylindrical body 220.The second flow regulating valve 40B is by 225 supportings of second S. A., and this second S. A. 225 vertically extends with the central axis of cylindrical body 220.First S. A. 224 and second S. A. 225 extend to left and right vehicle wheel direction Y1 respectively.In addition, first S. A. 224 and second S. A. 225 are outstanding to the right side of cylindrical body 220 from the right flank of cylindrical body 220 respectively.

Fig. 6 is the schematic right elevation of the main portion of throttle valve body 38 peripheries, wherein shows the cross section of a part.Fig. 7 is the schematic right elevation of the main portion of throttle valve body 38 peripheries, wherein shows the cross section of a part.When Fig. 6 and Fig. 7 show first throttle valve 40A and the second flow regulating valve 40B respectively and are in full-shut position.First throttle valve 40A when " the first throttle valve 40A and the second flow regulating valve 40B full cut-off " is meant the tickover that throttle grip do not handled and the state of the second flow regulating valve 40B.Below, when being in full-shut position, first throttle valve 40A and the second flow regulating valve 40B describe as benchmark.

With reference to figure 6 and Fig. 7, first S. A. 224 and second S. A. 225 are respectively rotatably by cylindrical body 220 supportings.Through the rotation of first S. A. 224, first throttle valve 40A is around first S. A. 224 and the rotation of first S. A., 224 one.Likewise, through the rotation of second S. A. 225, the second flow regulating valve 40B is around second S. A. 225 and the rotation of second S. A., 225 one.

Driving pulley 226 rotatably is attached on the right part of second S. A. 225.Driving pulley 226 is included in the right side board of arranging on the left and right vehicle wheel direction 302 and left side board 303.Flow regulating valve cable 304 is installed on driving pulley 226.One end of flow regulating valve cable 304 and the throttle grip of handlebar 10 link.The other end of flow regulating valve cable 304 and driving pulley 226 link.The other end of flow regulating valve cable 304 is configured between right side board 302 and the left side board 303.Through as above constituting, driving pulley 226 and chaufeur rotate the operation interlock of flow regulating valve.Second S. A. 225 rotates through the rotation of driving pulley 226, thereby opens and closes the second flow regulating valve 40B.

The on-off action of the on-off action of the second flow regulating valve 40B and first throttle valve 40A is through connecting rod mechanism 227 and interrelated.That is, the first and second flow regulating valve 40A, 40B interlock.

Connecting rod mechanism 227 has so-called idle running (lost motion) structure, and it makes first throttle valve 40A be later than the beginning of opening valve events of the second flow regulating valve 40B and begins out valve events.This connecting rod mechanism 227 is configured in the right side of the cylindrical body 220 of throttle valve body 38, and is configured in the top of engine main body 21.Connecting rod mechanism 227 comprises: first main link component 228; Be configured in second main link component 229 of first main link component, 228 rear sides; Auxiliary connecting rod parts 230; And rotation transmission member 231.

With reference to figure 6 with as the Fig. 8 along the section drawing of the main portion of the VIII-VIII line of Fig. 6, connecting rod mechanism 227 is configured in the right side as the side on the left and right vehicle wheel direction Y1 with respect to the central axis S1 of the cylindrical body 220 of throttle valve body 38.This central axis S1 is the center of throttle valve body 38 on left and right vehicle wheel direction Y1.Second main link component 229 is little chip parts that the left side board 303 with driving pulley 226 forms as one.Second main link component 229 is configured in the right part of second S. A. 225, can be that the center is rotated with second S. A. 225.

Second main link component 229 comprises: base end part 305, and it is connected with the left side board 303 of driving pulley 226; And top ends 306, it links to each other with this base end part 305, and is configured in the left side with respect to base end part 305.This top ends 306 is formed the vertical tabular with left and right vehicle wheel direction Y1.Top ends 306 is configured in the below of second S. A. 225.In addition, the lower end of the central portion 307 on the length direction of the cylindrical body 220 of top ends 306 and throttle valve body 38 is arranged on the left and right vehicle wheel direction Y1.

Second connection shaft 232 is installed on top ends 306.Second connection shaft 232 is axles parallel with second S. A. 225.Second main link component 229 rotatably links with auxiliary connecting rod parts 230 via second connection shaft 232.

Auxiliary connecting rod parts 230 are along the elongated sheet metal member of vehicle fore-and-aft direction X1, are associated with second main link component 229 and first main link component 228.

It is parallel with left and right vehicle wheel direction Y1 that auxiliary connecting rod parts 230 are configured to the thickness direction of these auxiliary connecting rod parts 230.Auxiliary connecting rod parts 230 are configured in the below of first S. A. 224 and second S. A. 225.Auxiliary connecting rod parts 230 are between the right part that is configured in first and second main link component 228,229 and cylindrical body 220 on the left and right vehicle wheel direction Y1.

The rearward end 308 of auxiliary connecting rod parts 230 is at the position overlaid of front end on vehicle fore-and-aft direction X1 of each side plate 302,303 of position on the vehicle fore-and-aft direction X1 and driving pulley 226.In addition, the pars intermedia 309 on the length direction of auxiliary connecting rod parts 230 is at position on the vehicle fore-and-aft direction X1 and the position overlaid of first S. A. 224 on vehicle fore-and-aft direction X1.In addition, the leading section 310 of auxiliary connecting rod parts 230 is positioned at the position than first S. A., 224 more forward sides.

When right flank is observed, auxiliary connecting rod parts 230 are formed V word shape.Thus, the pars intermedia 309 of auxiliary connecting rod parts 230 is positioned at the position of more leaning on the below than the leading section 310 and the rearward end 308 of auxiliary connecting rod parts 230.

On the top ends 306 of second main link component 229, dispose second connection shaft 232.The leading section 310 of auxiliary connecting rod parts 230 links with the bottom 311 of first main link component 228 via first connection shaft 233, and these bottom 311 rotations relatively.First connection shaft 233 is axles parallel with first S. A. 224.

With reference to figure 6 and Fig. 7, first main link component 228 is the elongated parts that form through panel beating.First main link component 228 is formed the shape of extending to downside along with approaching the front side.First main link component 228 comprises bottom 311, pars intermedia 312 and upper end 313.

It is parallel with left and right vehicle wheel direction Y1 that the pars intermedia 312 of first main link component 228 and bottom 311 are configured to its thickness direction.Driving pulley 226 is at position on the vehicle above-below direction Z1 and the position overlaid of first main link component 228 on vehicle above-below direction Z1.The pars intermedia 312 of first main link component 228, bottom 311 are at pars intermedia 309, the position overlaid of leading section 310 on vehicle fore-and-aft direction X1 of position on the vehicle fore-and-aft direction X1 and auxiliary connecting rod parts 230.The pars intermedia 312 of first main link component 228, bottom 311 are at the position overlaid of top ends 306 on left and right vehicle wheel direction Y1 of the position on the left and right vehicle wheel direction Y1 and first main link component 228.

The upper end 313 of first main link component 228 is crooked to the right with respect to pars intermedia 312 ground that slightly meets at right angles.The upper end 313 of first main link component 228 comprises the portion 314 that is provided with of extending, and this extension is provided with portion 314 and extends to the direction away from the central axis J3 of first S. A. 224.This extension is provided with portion 314 and is provided with pressing component 234.It is outstanding to a circumferential side (among Fig. 6, being the right side) of first S. A. 224 that pressing component 234 is provided with portion 314 from extension.Thus, pressing component 234 is upwards relative in the week of first S. A. 224 with the portion that is pressed 235 that will be explained below of rotation transmission member 231.

The pars intermedia 312 of first main link component 228 and the right part of first S. A. 224 are can counterrotating mode linking.Thus, first main link component 228 can be independent of first S. A. 224 and rotate.

As the central axis J1 of second S. A. 225 of the center of oscillation of second main link component 229 and the central axis J2 standoff distance D2 of second connection shaft 232.In addition, as the central axis J3 of first S. A. 224 of the center of oscillation of first main link component 228 and the central axis J4 standoff distance D1 of first connection shaft 233.The relation that has D2＞D1 between distance B 1, the D2.

Rotation transmission member 231 is the parts that form through panel beating.But the rotation transmission member 231 and first S. A. 224 link and the one rotation.On rotation transmission member 231, be formed with can with the portion that is pressed 235 of press section 234 butts.The portion 235 that is pressed extends to the direction away from the central axis J3 of first S. A. 224.When the second flow regulating valve 40B was in full-shut position, pressing component 234 was relative upwards separating predetermined interval M1 the week of first S. A. 224 with the parts 235 that are pressed.When observing on the right side, in the situation summer of tickover, two main link component 228,229 one-tenth be the oblique posture that extends below of square neck forward.

Fig. 9 is the schematic right elevation of the first throttle valve 40A and the second flow regulating valve 40B throttle valve body when being in full-gear.As shown in Figure 9, when the first throttle valve 40A and the second flow regulating valve 40B standard-sized sheet, two main link component 228,229 one-tenth are tilted to the posture that extends below towards the rear.In addition, in the process of two main link component, 228,229 swings, auxiliary connecting rod parts 230 keep the posture with vehicle fore-and-aft direction X1 almost parallel, and under the state that changes the position on the vehicle above-below direction Z1, on vehicle fore-and-aft direction X1, swing.When first throttle valve 40A and the second flow regulating valve 40B are in idle state and during full-gear, auxiliary connecting rod parts 230 are positioned at the place, high position on the vehicle above-below direction Z1.In addition, open under the half the state at first throttle valve 40A, auxiliary connecting rod parts 230 are in minimum position.

As shown in Figure 6, imagination when when right flank is observed from as the central axis J3 of first S. A. 224 of the center of oscillation of the first main link component 45A the first imaginary line P1 to the central axis J4 of first connection shaft 223.In addition, the second imaginary line P2 of the central axis J2 of the central axis J4 of imagination binding first connection shaft 233 and second connection shaft 232.In the situation summer of observing from right flank, when first and second flow regulating valve were in full-shut position, imaginary line P1, the formed angle θ 1 of P2 were acute angle.

Here, like Fig. 6 and shown in Figure 9, when the second flow regulating valve 40B when opening valve state transitions to full-shut position, left-hand revolution when first and second main link component 228,229 are observed on the right side.In addition, auxiliary connecting rod parts 230 from moving back to the front side.At this moment, if the second flow regulating valve 40B near full-shut position, foreign matters such as muddy water just easily are carried on the upper limb 315 between the upper limb 315 of the pars intermedia 309 of the lower edge 314 of the pars intermedia 312 of first main link component 228 and auxiliary connecting rod parts 230.

Therefore, be provided with the means that make that foreign matters such as muddy water are difficult to carry.Particularly, on the lower edge 314 of the pars intermedia 312 of first main link component 228, be formed with bellying 318.When right flank is observed, bellying 318 bloats towards auxiliary connecting rod parts 230 sides (downside) camber.

Thus; As shown in Figure 6; When the second flow regulating valve 40B standard-sized sheet, in the situation summer of observing from the right side, the upper limb 315 formed angle θ 2 of the bellying 318 of first main link component 228 and the pars intermedia 309 of auxiliary connecting rod parts 230 are greater than two imaginary line P1, the formed angle θ 1 of P2.That is the relation that, has θ 2＞θ 1.Therefore, when when right flank is observed, can reduce by two imaginary line P1, P2 and through bellying 318 in the plumb line Q1 institute area surrounded of the central axis J3 of first S. A. 224 and the gap between the upper limb 315.Consequently, foreign matter such as muddy water is difficult between the upper limb 315 of the lower edge 314 of first main link component 228 and auxiliary connecting rod parts 230, be carried on the upper limb 315.

The means that between the upper limb 315 of the lower edge 314 of first main link component 228 and auxiliary connecting rod parts 230, make foreign matters such as muddy water be difficult to be carried on the upper limb 315 it is also conceivable that other means.For example, can consider through enlarge the first and second flow regulating valve 40A, the front and back of 40B on vehicle fore-and-aft direction X1 make said lower edge 314 and upper limb 315 formed angles not be the structure of acute angle at interval.Yet in the case, connecting rod mechanism 227 can be elongated on vehicle fore-and-aft direction X1.Thereby cause throttle valve body 38 elongated on vehicle fore-and-aft direction X1.In this regard,, can avoid the size of throttle valve body 38 to become big, and can make foreign matter such as muddy water be difficult between the upper limb 315 of the lower edge 314 of first main link component 228 and auxiliary connecting rod parts 230, be carried on the upper limb 315 according to this embodiment.

As shown in Figure 7, between the cylindrical portion 220 of throttle valve body 38 and first main link component 228, dispose first torsion coil spring 316.First torsion coil spring 316 is used for first throttle valve 40A is applied to the turning effort of closing the valve direction.316 pairs first S. A.s 224 of first torsion coil spring apply said turning effort.First torsion coil spring 316 is configured to surround first S. A. 224.Constituted the first swing axial region 317 by said first torsion coil spring 316 and first S. A. 224.

Between the cylindrical portion 220 of flow regulating valve 38 and driving pulley 226, dispose second torsion coil spring 319.Second torsion coil spring 319 is used for the second flow regulating valve 40B is applied to the turning effort of closing the valve direction.Second torsion coil spring 319 applies said turning effort via driving pulley 226 to second S. A. 225.Second torsion coil spring 319 is configured to surround second S. A. 225.Constituted the second swing axial region 320 by said second torsion coil spring 319 and second S. A. 225.

Between the right part 370 of the cylindrical body 220 of first and second S. A.s 224,225, throttle valve body 38 and auxiliary connecting rod parts 230, be formed with the space R1 that is roughly rectangle when overlooking.The open spaces R2 that on vehicle above-below direction Z1, opens wide is formed between the swing axial region 317 of first among the R1 of space and the second swing axial region 320.The upper surface of guard shield 50 is positioned at the below of open spaces R2.Thereby foreign matters such as muddy water are through dropping on the upper surface of guard shield 50 as the open spaces R2 of foreign matter passage.But, foreign matter such as muddy water is not accumulated near the guard shield 50 the auxiliary connecting rod parts 230.Through not making the accumulation of foreign matter such as muddy water, can produce the advantage that can suppress that auxiliary connecting rod parts 230 are made dirty etc.

Therefore, throttle valve body 38 is provided with cap assembly 321.Last cap assembly 321 from the top of vehicle above-below direction Z1 cover connecting rod mechanism 227 near.When overlooking, last cap assembly 321 covers at least a portion of open spaces R2.Thus, the aperture area of the open spaces R2 under overlooking diminishes.

With reference to figure 7 and Fig. 8, last cap assembly 321 is formed the tabular of vertically extending with left and right vehicle wheel direction Y1.Last cap assembly 321 is configured in the position that exceeds several millimeter than open spaces R2.Thus, last cap assembly 321 is positioned at the top of first and second S. A.s 224,225.On left and right vehicle wheel direction Y1, last cap assembly 321 is configured between the right part 370 and auxiliary connecting rod parts 230 of cylindrical body 220.The leading section 322 of last cap assembly 321 and first S. A. 224 are arranged on vehicle above-below direction Z1.The rearward end 323 of last cap assembly 321 and second S. A. 225 are arranged on vehicle above-below direction Z1.In addition, on vehicle fore-and-aft direction X1, last cap assembly 321 from the upper end 313 of first main link component 228 to the rear extension of second main link component 229.

As shown in Figure 6, the rearward end of last cap assembly 321 323 forms as one with the carriage 324 that is used to support flow regulating valve cable 304.Carriage 324 is fixed on the right flank of throttle valve body 38 through Screw 325,326.Carriage 324 comprises: the flat fixedly board 327 vertical with left and right vehicle wheel direction Y1; And the supporting board of giving prominence to approximate right angle to the right from the fixing end edge of board 327 328.The through hole 329 that is formed on the supporting board 328 is managed 330 slotting wearing.The pars intermedia of flow regulating valve cable 304 is inserted and is through in this pipe 330.The pars intermedia of flow regulating valve cable 304 is supported thus.

With reference to figure 4, secondary free air diffuser organizator 41 is formed between first boss 32 of cylindrical body 220 and cylinder head 23 of throttle valve body 38.The integral body of secondary free air diffuser organizator 41 is configured in the outside of guard shield 50.Secondary free air diffuser organizator 41 has formed secondary free air diffuser K1.

First boss 32 forms as one with cylinder head 23.On first boss 32, eductor 34 is installed.On first boss 32, formed the 4th boss 239.The 4th boss 239 extends with respect to the axis normal ground of eductor 34.The 3rd boss 238 is installed on the 4th boss 239.

Secondary air inlet organizator 41 comprises: be fixed on second boss 236 on the cylindrical body 220; Be formed on the 4th boss 239 on the cylinder head 23; Be installed in the 3rd boss 238 on the 4th boss 239; And the flexible pipe 237 that connects the 3rd boss 238 and second boss 236.

Second boss 236 is metal cartridges, is formed L word shape.Second boss 236 is configured in the upside of cylindrical body 220.One end of second boss 236 has constituted the upstream extremity formation portion 240 of secondary free air diffuser organizator 41.One end of upstream extremity formation portion 240 is fixed on the cylindrical body 220 between the first throttle valve 40A and the second flow regulating valve 40B.Secondary free air diffuser K1 in second boss 236 has constituted the upstream extremity K2 of secondary free air diffuser K1, and is communicated with main free air diffuser P1.

Flexible pipe 237 is the bodys that formed by rubber or other pliability materials.One end of flexible pipe 237 is connected with the other end of 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 as one.The 4th boss 239 is vertical basically with the central axis that first boss 32 is configured to each other.With reference to figure 4 and Fig. 5, the 4th boss 239 is configured in the outside of guard shield 50.Secondary free air diffuser K1 in the 4th boss 239 has constituted the downstream end K3 of secondary free air diffuser K1.Downstream end K3 is communicated with first boss, 32 interior chamber G2.The other end of the 3rd boss 238 is connected with the 4th boss 239.Constituted the downstream end formation portion 241 of secondary free air diffuser organizator 41 through the other end, the 3rd boss 238 and the 4th boss 239 of flexible pipe 237.Said downstream end formation portion 241 is connected with first boss 32 in the outside of guard shield 50.

Through as above constituting, the upstream extremity K2 of secondary free air diffuser K1 forms through the upstream extremity formation portion 240 of second boss 236, and between the first and second flow regulating valve 40A, 40B, is communicated with main free air diffuser P1.In addition, the downstream end K3 of secondary free air diffuser K1 forms through downstream end formation portion 241.Downstream end K3 is via chamber G2 and through hole 217 and be communicated with jet space G3.

Air inlet enters into secondary free air diffuser K1 as additional air from main free air diffuser P1.Additional air through secondary free air diffuser K1 is imported among the jet space G3 via the through hole 217 of chamber G2 and fixer 33.The additional air that is supplied among the jet space G3 is blown to from eductor 34 injected fuel, promotes the micronize of fuel thus.

Figure 10 is the figure of relation of aperture that aperture and the second flow regulating valve 40B of first throttle valve 40A are shown.In Figure 10, the aperture of first throttle valve 40A is represented as zero when tickover.Likewise, the aperture of the second flow regulating valve 40B is represented as zero when tickover.

In Figure 10, solid line illustrate the first and second flow regulating valve 40A in this embodiment, the aperture of 40B.Shown in the figure of this solid line, when the aperture of the second flow regulating valve 40B is 10 degree when following, the aperture of first throttle valve 40A is maintained 0 and spends.

On the other hand, in Figure 10, the illustrating owing to idle running mechanism is not set and the identical all the time situation of aperture of first and second flow regulating valve of dotted line.Shown in the figure of the figure of these dotted lines and solid line, in this embodiment, the second flow regulating valve 40B is later than first throttle valve 40A and opens valve events.The action of the first and second flow regulating valve 40A, 40B below will be described in further detail.

With reference to figure 6 and Figure 10, the aperture of the first throttle valve 40A and the second flow regulating valve 40B is controlled by following with the variation of load (flow regulating valve operational ton).At first, the first throttle valve 40A in downstream that is positioned at the flow direction C1 of air inlet remains on full close position from non-loaded (idling) operation range to predetermined fractional load operation range.

Particularly, till reaching the fractional load operation range, along with chaufeur to the operation of flow regulating valve and the rotation of the driving pulley 226 that produces is not delivered to first S. A. 224, and only pass to second S. A. 225.

This be because, the circumferential upper compartment crack M1 of parts 235 that be pressed of pressing component of first main link component 228 234 and rotation transmission member 231 at first S. A. 224.At this moment, the swing of first main link component 228 and second main link component 229 is interlock mutually, but rotation transmission member 231 is not swung.

Therefore, through the rotation of second S. A. 225, have only second flow regulating valve to open and close.At this moment, the action of auxiliary connecting rod parts 230 and first main link component 228 and second main link component 229 is moved linkedly.Thus, first main link component 228 is around 224 rotations of first S. A..But before the pressing component 234 and parts 235 butts that are pressed of first main link component 228, first S. A. 224 does not rotate with first throttle valve 40A.

Therefore, like Fig. 4 and shown in Figure 10,, flow into amount of air among the jet space G3 of injection cock 35 only based on the aperture of the second flow regulating valve 40B and Be Controlled up to reaching fractional load operation range position.In this fractional load operation range, the additional air that flows into secondary free air diffuser K1 in jet space G3 with the fuel mix that ejects from injection cock 35.Thus, the micronize of fuel can be promoted, thereby the combustion efficiency of fuel can be improved.Therefore, can reduce the unburned fuel that when engine low-temperature starting-up, is easy to generate.

On the other hand, from the fractional load zone to the process that the high capacity operation range shifts, first throttle valve 40A response flow regulating valve operation and drive valve gradually.

Thus, be not only the additional air through secondary free air diffuser K1, the air inlet of the other end of process admission port 221 also is directed in the cylinder head 23.

Particularly, with reference to figure 9 and Figure 10, when from the fractional load zone when the high capacity operation range shifts, be that the rotation amount of first main link component 228 of benchmark will be above predetermined value during with tickover.Consequently, the pressing component 234 of first main link component 228 and parts 235 butts that are pressed of rotation transmission member 231.Thus, the rotation interlock of rotation transmission member 231, first S. A. 224 and first main link component 228 and being rotated, thereby first throttle valve 40A rotation.Thus, be not only the air inlet through secondary free air diffuser K1, the air of process connection pipe 39 also is directed in the cylinder head 23.

As stated, in connecting rod mechanism 227, because distance B 2＞distance B 1, therefore in the high capacity operation range, the opening and closing speed of first throttle valve 40A is faster than the opening and closing speed of the second flow regulating valve 40B.Consequently, when making the second flow regulating valve 40B standard-sized sheet, first throttle valve 40A is standard-sized sheet also.

With reference to figure 1 and Fig. 6, in the automatic two-wheeled cycle 200 of this embodiment, storage case 301 is configured in the top of engine main body 21.Storage case 301 is to be used to hold safety cap etc.Storage case 301 is by body shell 15 supportings.

Storage case 301 is configured in the following side space G1 of vehicle seat 16.Vehicle seat 16 plays a role as the lid that the opening that is used for the upper surface of storage case 301 opens and closes.Particularly, the front end at vehicle seat 16 is provided with hinge 331.Through make vehicle seat 16 around hinge 331 rotation open wide storage case 301 above opening.In addition, if vehicle seat 16 is reverted to the state that can take a seat, then the top opening of storage case 301 will be closed.

Auxiliary connecting rod parts 230 are configured to more lean on the below than first and second S. A.s 224,225 of two flow regulating valve 40A, 40B.Thus, avoided the bottom surface confused of auxiliary connecting rod parts 230 with storage case 301.

But; If auxiliary connecting rod parts 230 are configured in than first and second S. A.s 224,225 more near the position of the below of vehicle above-below direction Z1, then will shorten with the distance B 3 of auxiliary connecting rod parts 230 on vehicle above-below direction Z1 with auxiliary connecting rod parts 230 relative relative portions 333 in the upper wall 243 of guard shield 50.

On the other hand, engine unit 20 is the integrated oscillating type driving engines that can on above-below direction, swing with respect to body shell 15 around pivot 25.Thus, the position of the cylindrical body 220 of trailing wheel 27 and throttle valve body 38 is near.Thereby may be splashed to by the foreign matters such as muddy water that trailing wheel 27 is rolled throttle valve body 38 cylindrical body 220 near.

Therefore, down cap assembly 334 is set on engine unit 20, is splashed near the means of the foreign matters such as muddy water the cylindrical body 220 as discharge.

With reference to figure 6, following cap assembly 334 is configured between the relative portion 333 of upper wall 243 of auxiliary connecting rod parts 230 and guard shield 50.That is, following cap assembly 334 is configured between the cylinder block 22 of connecting rod mechanism 227 and engine main body 21, is configured in the top of engine main body 21 and guard shield 50 thus.Following cap assembly 334 is single component that the sheet metal bending machining of reservation shape is shaped.That is, following cap assembly 334 is to use than plastic guard shield 50 hard materials and forms.Following cap assembly 334 comprises longitudinal wall part 335 and inclined wall portion 336.

With reference to figure 6 and Fig. 8, longitudinal wall part 335 is and the vertical tabular of left and right vehicle wheel direction Y1.Longitudinal wall part 335 integral body form the elongated shape along vehicle fore-and-aft direction X1.Right flank 337 as the wall of longitudinal wall part 335 is relative with the left surface 338 of auxiliary connecting rod parts 230.Longitudinal wall part 335 comprises the support of arranging along vehicle fore-and-aft direction X1 339 and installation portion 340.

Support 339 is configured in the front of longitudinal wall part 335.The bottom of support 339 and inclined wall portion 336 direct connections.Installation portion 340 is configured in the rear end side of longitudinal wall part 335.Installation portion 340 is used for following cap assembly 334 is installed in the cylindrical body 220 of throttle valve body 38.

With reference to figure 7 and Fig. 8, the bottom 343 of the cylindrical body 220 of throttle valve body 38 is provided with the 343 downward outstanding 344F of seat portion, the 344R from this bottom.Following cap assembly 334 is last through each 344F of, 344R that the Screw 345,346 of inserting the through hole (not shown) of wearing cap assembly 334 is fixed on cylindrical body 220.

Figure 11 is the enlarged drawing of following cap assembly 334 peripheries of Fig. 6.Figure 12 is the enlarged drawing of following cap assembly 334 peripheries of Fig. 7.Figure 13 is the enlarged drawing of following cap assembly 334 peripheries of Fig. 8.

With reference to Figure 11 and Figure 13, the pars intermedia on the length direction of the last ora terminalis of inclined wall portion 336 is connected to the following ora terminalis of support 339.Inclined wall portion 336 is configured in the right side with respect to longitudinal wall part 335.Following cap assembly 334 is configured on the position of central axis S1 deflection as the right side of the side of left and right vehicle wheel direction Y1 with respect to the cylindrical portion 220 of throttle valve body 38 as a whole.

Inclined wall portion 336 forms the tabular of bending.The upper surface of this inclined wall portion 336 is the faces 347 that in its whole zone, are inclined relative to horizontal.The right flank 337 of longitudinal wall part 335 erects on vehicle above-below direction Z1 along the highest ora terminalis 348 on vehicle above-below direction Z1 in the face 347.

Face 347 can wait and splashes down foreign matters such as muddy water on face 347 from face 347 discharges being splash through trailing wheel 27 from ground.Face 347 is relative with connecting rod mechanism 227 between connecting rod mechanism 227 and engine main body 21.

Face 347 tilts with respect at least one direction of left and right vehicle wheel direction Y1 and vehicle fore-and-aft direction X1.Particularly, face 347 forms the shape that just is in the below near the right side more as a whole.Thus, face 347 has inclination on left and right vehicle wheel direction Y1.In addition, face 347 forms as a whole and approaches the shape that the rear just is in the below more more.

With reference to Figure 12, when overlooking, face 347 is configured to open spaces R2 overlapping.That is, face 347 be configured on the left and right vehicle wheel direction Y1 corresponding to the right part 370 of the cylindrical body 220 of throttle valve body 38 and the open spaces R2 between the auxiliary connecting rod parts 230.In addition, face 347 is configured on vehicle fore-and-aft direction X1 corresponding to first and second S. A.s 224, open spaces R2 between 225.

In face 347, stipulated along the first imaginary boundary line T1 of vehicle fore-and-aft direction X1 extension.The first imaginary boundary line T1 is configured in the side of taking back of face 347 on left and right vehicle wheel direction Y1, and be configured in cylindric 220 and auxiliary connecting rod parts 230 between.

In addition, in face 347, stipulated along the second imaginary boundary line T2 of left and right vehicle wheel direction Y1 extension.The second imaginary boundary line T2 is configured in the inclined to one side front side of face 347 on vehicle fore-and-aft direction X1.In addition, on vehicle fore-and-aft direction X1, the position of the second imaginary boundary line T2 and the first swing axial region 317 are overlapping.When overlooking, the first imaginary boundary line T1 is vertical with the second imaginary boundary line T2.

Face 347 comprises first inclined-plane 351, second inclined-plane 352, the 3rd inclined-plane 353 and the 4th inclined-plane 354.Face 347 is defined by the first and second imaginary boundary line T1, T2, has formed above-mentioned four inclined-planes 351～354 thus.Each 351～354 equal general planar ground, above-mentioned inclined-plane forms.

First inclined-plane 351 and second inclined-plane 352 be configured in the face 347 away from the zone on the right side of longitudinal wall part 335, the i.e. zone on the right side of the first imaginary boundary line T1.First and second inclined-planes 351,352 are across the second imaginary boundary line T2 and arrange front and back.

The 3rd inclined-plane 353 and the 4th inclined-plane 354 be configured in the face 347 near the zone in the left side of longitudinal wall part 335, the i.e. zone in the left side of the first imaginary boundary line T1.Third and fourth inclined-plane 353,354 is across the second imaginary boundary line T2 and arrange front and back.

In other words, first inclined-plane 351 and the 3rd inclined-plane 353 the front side of the second imaginary boundary line T2 across the first imaginary boundary line T1 and about arrange.In addition, second inclined-plane 352 and the 4th inclined-plane 354 the rear side of the second imaginary boundary line T2 across the first imaginary boundary line T1 and about arrange.

The 3rd inclined-plane 353 through second of the conduct of on left and right vehicle wheel direction Y1, arranging and formed unit, said inclined-plane 355 as first first inclined-plane 351.Said the 3rd inclined-plane 353 and first inclined-plane 351 are configured in the right side as the side of left and right vehicle wheel direction Y1 with respect to the central axis S1 of the cylindrical body 220 of throttle valve body 38.

With reference to Figure 12 and Figure 13, the 3rd inclined-plane 353 is configured in the left side of conduct at the opposite side of left and right vehicle wheel direction Y1 with respect to first inclined-plane 351.The left surface 338 of the 3rd inclined-plane 353 and auxiliary connecting rod parts 230 and the front end of lower surface 356 are respectively relatively.

First inclined-plane 351 is configured in the right side as the side of left and right vehicle wheel direction Y1 with respect to the 3rd inclined-plane 353.First inclined-plane 351 is relative with the front end of the lower surface 356 of auxiliary connecting rod parts 230, and relative with first main link component 228 on above-below direction.

Figure 14 is the section drawing along the main portion of the XIV-XIV line of Figure 12.In Figure 14, only show conduct first cross section 357 in the cross section of cap assembly 334 down.With reference to Figure 12 and Figure 14, wherein stipulated the first imaginary plane U1 vertical with vehicle fore-and-aft direction X1.The first imaginary plane U1 is configured on the position arbitrarily of unit, inclined-plane, front side 355 of vehicle fore-and-aft direction X1.In Figure 14,, show the state of the first imaginary plane U1 that observes the inclined to one side front end that is configured in unit, inclined-plane, said front side 355 as an example.

In first cross section 357, on left and right vehicle wheel direction Y1, the inclination on the 3rd inclined-plane 353 is greater than the inclination on first inclined-plane 351.In other words, in first cross section 357, the 3rd inclined-plane 353 with respect to the horizontal plane the angle θ 3 of B1 greater than the first inclined-plane 351 angle θ 4 of B1 (θ 3＞θ 4) with respect to the horizontal plane.The angle θ 4 on first inclined-plane 351 is greater than zero, and first inclined-plane 351 tilts with respect to left and right vehicle wheel direction Y1 thus.

As stated, first inclined-plane 351 is configured in the right side with respect to the 3rd inclined-plane 353, and just is in the below more the closer to the right side.In addition, the 3rd inclined-plane 353 is configured in the left side with respect to first inclined-plane 351, and extends towards first inclined-plane 353.In addition, the 3rd inclined-plane 353 just is in the below more the closer to the right side.

With reference to Figure 12 and Figure 13, the 4th inclined-plane 354 through second of the conduct of on left and right vehicle wheel direction Y1, arranging and formed unit, rear side inclined-plane 358 as first second inclined-plane 352.Said the 4th inclined-plane 354 and second inclined-plane 352 are configured in the right side as the side of left and right vehicle wheel direction Y1 with respect to the central axis S1 of the cylindrical body 220 of throttle valve body 38.

The 4th inclined-plane 354 is configured in the left side as the opposite side of left and right vehicle wheel direction Y1 with respect to second inclined-plane 352.The rear end of the 4th inclined-plane 354 and the left surface 338 of auxiliary connecting rod parts 230, the rear end of lower surface 356 are relative.

The 4th inclined-plane 354 is configured in the right side as the side of left and right vehicle wheel direction Y1 with respect to second inclined-plane 352.Second inclined-plane 352 is relative with the rear end of the lower surface 356 of auxiliary connecting rod parts 230 on above-below direction, and relative with second main link component 229 on above-below direction.

Figure 15 is the section drawing along the main portion of the XV-XV line of Figure 12.In Figure 15, only show conduct second cross section 359 in the cross section of cap assembly 334 down.With reference to Figure 12 and Figure 15, wherein stipulated the second imaginary plane U2 vertical with vehicle fore-and-aft direction X1.The second imaginary plane U2 is configured on the position arbitrarily of unit, rear side inclined-plane 358 of vehicle fore-and-aft direction X1.In Figure 15,, show the state of the second imaginary plane U2 that observes the inclined to one side front end that is configured in unit, rear side inclined-plane 358 as an example.

In second cross section 359, on left and right vehicle wheel direction Y1, the inclination on the 4th inclined-plane 354 is greater than the inclination on second inclined-plane 352.In other words, in second cross section 359, the 4th inclined-plane 354 with respect to the horizontal plane the angle θ 5 of B1 greater than the second inclined-plane 352 angle θ 6 of B1 (θ 5＞θ 6) with respect to the horizontal plane.The angle θ 6 on second inclined-plane 352 is greater than zero, and second inclined-plane 352 tilts with respect to left and right vehicle wheel direction Y1 thus.

As stated, second inclined-plane 352 is configured in the right side with respect to the 4th inclined-plane 354, and just is in the below the closer to the right side.In addition, the 4th inclined-plane 354 is configured in the left side with respect to second inclined-plane 352, and extends towards second inclined-plane 352.In addition, the 4th inclined-plane 354 just is in the below the closer to the right side.

With reference to Figure 14 and Figure 15, the angle θ 5 on the 4th inclined-plane 354 in the angle θ 3 on the 3rd inclined-plane 353 in first cross section 357 and second cross section 359 equates (θ 3=θ 5).In addition, the angle θ 6 on second inclined-plane 352 in the angle θ 4 on first inclined-plane 351 in first cross section 357 and second cross section 359 equates (θ 4=θ 6).

With reference to Figure 12 and Figure 13, the 3rd inclined-plane 353 has constituted the 7th inclined-plane 363.That is, in face 347, the part that constitutes the 3rd inclined-plane 353 also is the part that constitutes the 7th inclined-plane 363.In addition, the 4th inclined-plane 354 has constituted the 8th inclined-plane 364.That is, in face 347, the part that constitutes the 4th inclined-plane 354 also is the part that constitutes the 8th inclined-plane 364.

Formed unit, inclined-plane 365, left side through what on vehicle fore-and-aft direction X1, arrange as the 7th inclined-plane 363 of fourth face with as the 3rd the 8th inclined-plane 364.The 7th inclined-plane 363 is configured in the front side on the 8th inclined-plane 364.

Figure 16 is the section drawing along the main portion of the XVI-XVI line intercepting of Figure 13.In Figure 16, only show conduct the 3rd cross section 366 in the cross section of cap assembly 334 down.With reference to Figure 13 and Figure 16, stipulated the three imaginary plane U3 vertical with left and right vehicle wheel direction Y1.The 3rd imaginary plane U3 is configured on the position arbitrarily of the unit, inclined-plane, left side 365 on the left and right vehicle wheel direction Y1.In Figure 16,, show the state of the 3rd imaginary plane U3 that observes the side that takes over that is configured in unit, inclined-plane 365, left side as an example.

In the 3rd cross section 366, on vehicle fore-and-aft direction X1, the inclination on the 7th inclined-plane 363 is greater than the inclination of the 8th dip plane 364.In other words, in the 3rd cross section 366, the 7th inclined-plane 363 with respect to the horizontal plane the angle θ 7 of B1 greater than the 8th inclined-plane 364 angle θ 8 of B1 (θ 7＞θ 8) with respect to the horizontal plane.The angle θ 8 on the 8th inclined-plane 364 is greater than zero, and the 8th inclined-plane 364 tilts with respect to vehicle fore-and-aft direction X1 thus.

As stated, the 8th inclined-plane 364 approaches the rear with regard to below being in more.In addition, the 7th inclined-plane 363 is configured to than the 8th inclined-plane 364 more near the front side, and extends towards the 8th inclined-plane 364.The 7th inclined-plane 363 approaches the rear and just is in the below more.

With reference to Figure 12 and Figure 13, first inclined-plane 351 has constituted the 5th inclined-plane 361.That is, in face 347, the part that constitutes first inclined-plane 351 also is the part that constitutes the 5th inclined-plane 361.In addition, second inclined-plane 352 has constituted the 6th inclined-plane 362.That is, in face 347, the part that constitutes second inclined-plane 352 also is the part that constitutes the 6th inclined-plane 362.

Formed unit, inclined-plane, right side 367 through what on vehicle fore-and-aft direction X1, arrange as the 5th inclined-plane 361 of fourth face with as the 3rd the 6th inclined-plane 362.The 5th inclined-plane 361 is configured in the front side on the 6th inclined-plane 362.

Figure 17 is the section drawing along the main portion of the XVII-XVII line intercepting of Figure 13.In Figure 17, only show conduct the 4th cross section 368 in the cross section of cap assembly 334 down.With reference to Figure 13 and Figure 17, stipulated the four imaginary plane U4 vertical with left and right vehicle wheel direction Y1.The 4th imaginary plane U4 is configured on the position arbitrarily of the unit, inclined-plane, right side 367 on the left and right vehicle wheel direction Y1.In Figure 17, as an example, show the state of observing the 4th imaginary plane U4, said the 4th imaginary plane U4 is configured in the position of the deflection right-hand member of unit, inclined-plane, right side 367.

In the 4th cross section 368, the 5th inclined-plane 361 is with respect to the inclination of the vehicle fore-and-aft direction X1 inclination greater than the 6th inclined-plane 362.In other words, in the 4th cross section 368, the 5th inclined-plane 361 is angle θ 9 to the six inclined-planes 362 angle θ 10 big (θ 9＞θ 10) of B1 with respect to the horizontal plane of B1 with respect to the horizontal plane.The angle θ 10 on the 6th inclined-plane 362 is greater than zero, and the 6th inclined-plane 362 tilts with respect to vehicle fore-and-aft direction X1 thus.

Like this, the 6th inclined-plane 362 approaches the rear with regard to below being in more.In addition, the 5th inclined-plane 361 is configured in the front side with respect to the 6th inclined-plane 362, and extends towards the 6th inclined-plane 362.The 5th inclined-plane 361 approaches the rear and just is in the below more.

With reference to Figure 16 and Figure 17, the angle θ 9 on the 5th inclined-plane 361 in the angle θ 7 on the 7th inclined-plane 363 in the 3rd cross section 366 and the 4th cross section 368 equates (θ 7=θ 9).In addition, the angle θ 10 on the 5th inclined-plane 361 in the angle θ 8 on the 8th inclined-plane 364 in the 3rd cross section 366 and the 4th cross section 368 equates (θ 8=θ 10).

Rearward end in inclined wall portion 336 is formed with reinforced rib 369.Reinforced rib 369 is integrally formed with inclined wall portion 336.Part in the material of cap assembly 334, that be positioned at the rear of inclined wall portion 336 formed under reinforced rib 369 bendings constituted.

With reference to Figure 12 and Figure 13, reinforced rib 369 is formed on the whole zone of rearward end of the inclined wall portion 336 on the left and right vehicle wheel direction Y1.Reinforced rib 369 extends to downside with respect to the rearward end of inclined wall portion 336.Reinforced rib 369 the highest position from the end edge of inclined wall portion 336, on the vehicle above-below direction Z1 forms to minimum position continuously.As stated, reinforced rib 369 is along the curved shape extension of cap assembly 334 down.Thus, can suppressing down, cap assembly 334 deforms when receiving external force.

Next the effect of this embodiment is described.

With reference to figure 1, foreign matter such as muddy water is fallen from the upside of connecting rod mechanism 227.At this moment, as Figure 12 and shown in Figure 13, the foreign matters such as muddy water that fall directly over the bar linkage structure 227 drop on the face 347 through open spaces R2 etc.

Foreign matters such as muddy water on the 3rd inclined-plane 353 of face 347 and the 4th inclined-plane 354 shown in arrow W1, W2 such ground fall hastily towards downside.At this moment, foreign matter such as muddy water is on the 3rd inclined-plane 353, promptly also flow towards rear view of vehicle shown in arrow W1 on the 7th inclined-plane 363 suchly hastily.In addition, foreign matter such as muddy water is on the 4th inclined-plane 354, promptly also flow towards rear view of vehicle shown in arrow W2 on the 8th inclined-plane 364 suchly lentamente.

The foreign matters such as muddy water that fall hastily on the 3rd inclined-plane 353 or the 4th inclined-plane 354 will arrive first inclined-plane 351 or second inclined-plane 352.At this moment, foreign matter such as muddy water on first inclined-plane 351 and second inclined-plane 352 shown in arrow W3, W4 such ground flow hastily towards the right side.At this moment, foreign matter such as muddy water is on first inclined-plane 351, promptly also flow towards rear view of vehicle shown in arrow W3 on the 5th inclined-plane 361 suchly hastily.In addition, foreign matter such as muddy water is on second inclined-plane 352, promptly also flow towards rear view of vehicle shown in arrow W4 on the 6th inclined-plane 362 suchly lentamente.Through above-mentioned effect, foreign matters such as muddy water are discharged by right-hand member and rear end from face 347.

According to this embodiment, can obtain following effect.That is, at least in when idle running, air inlet is as additional air and by from secondary free air diffuser K1 Guide spray space G3.Thus, additional air is blown to the fuel that ejects from injection nozzle 35, thereby has promoted the micronize of fuel.As a result, can when idle running, improve the combustion efficiency of fuel at least.

In addition, in automatic two-wheeled cycle 200, engine main body 21 is configured in the below of connecting rod mechanism 227.In addition, engine main body 21 is covered from the front side by the antetheca 202 of vehicle body cover 18.That is, the below that has formed connecting rod mechanism 227 is covered by engine main body 21, and the place ahead of connecting rod mechanism 227 is by the state of antetheca 202 coverings of vehicle body cover 18.Thus, foreign matter such as muddy water can not arrive connecting rod mechanism 227 from below and the place ahead of connecting rod mechanism 227.Therefore, make the foreign matters of falling from the top of connecting rod mechanism 227 such as muddy water be difficult to accumulate in the periphery of connecting rod mechanism 227, can make the periphery of connecting rod mechanism 227 be difficult to accumulate foreign matters such as muddy water thus.

In addition, the foreign matters such as muddy water that drop on the connecting rod mechanism 227 from the top of connecting rod mechanism 227 can drop on down on the face 347 of cap assembly 334.Face 347 has with respect to the inclination of left and right vehicle wheel direction Y1 with respect to the inclination of vehicle fore-and-aft direction X1.Thus, the foreign matters such as muddy water on the face 347 are arranged the outside to left and right vehicle wheel direction Y1 or vehicle fore-and-aft direction X1 with respect to connecting rod mechanism 227.Thus, can suppress to accumulate in the periphery of connecting rod mechanism 227 from the foreign matter of the top of connecting rod mechanism 227.In addition, below connecting rod mechanism 227, dispose guard shield 50 and engine main body 21, and the place ahead of connecting rod mechanism 227 is covered by the antetheca 202 of vehicle body cover 18.Thus, suppressed below and the place ahead arrival connecting rod mechanism 227 of foreign matters such as muddy water from connecting rod mechanism 227.As a result, can suppress the periphery that foreign matters such as muddy water accumulate in connecting rod mechanism 227 effectively.Like this, can take sufficient countermeasure to foreign matters such as muddy water.

Therefore, though with connecting rod mechanism 227 and engine main body 21 on above-below direction near configuration, also can make foreign matter such as muddy water be difficult to accumulate between connecting rod mechanism 227 and the guard shield 50.Thus, can with connecting rod mechanism 227 and engine main body 21 on above-below direction near configuration.Therefore, to vehicle above-below direction Z1, can reduce the size of engine unit 20.Thus, therefore the position that needn't improve vehicle seat 16 just can further increase the capacity of storage case 301 at the further storage case 301 under the lengthening vehicle seat 16 on the vehicle above-below direction Z1.

In addition, in cylinder head 23, accommodate the part of eductor 34.Thus, compare, can reduce eductor 34 occupation space with the situation that eductor is installed in air inlet pipe.Therefore, can further enlarge the following side space G1 of vehicle seat 16.As a result, can further enlarge the capacity of storage case 301 of the below of vehicle seat 16.

In addition, the auxiliary connecting rod parts 230 that link first main link component 228 and second main link component 229 are configured in the downside of first and second S. A.s 224,225.Through above-mentioned constituted mode, can each linkage component 228,229,230 of connecting rod mechanism 227 be concentrated and is configured in guard shield 50 sides.As a result, can further enlarge the space of the top of connecting rod mechanism 227.Thus, can on vehicle above-below direction Z1, further increase storage case 301, thereby can guarantee bigger storage case.In addition, face 347 is configured to relative with the auxiliary connecting rod parts 230 of the lower end side that is configured in first and second main link component 228,229.Thus, even shorten the distance between auxiliary connecting rod parts 230 and the engine main body 21, also can suppress foreign matter such as muddy water effectively and accumulate on the auxiliary connecting rod parts 230.Therefore, help the expansion of storage case.

The air inlet pipe 36 that forms the part of main free air diffuser P1 is configured in the top of engine main body 21, therefore can correspondingly constitute restriction to the space that disposes storage case 301.But as stated,, therefore can increase the capacity of storage case 301 fully owing to taked to be used to guarantee the countermeasure of the configuration space of storage case 301.

In addition, face 347 is whole for just be in the below the closer to the right side.Thus, the foreign matters such as muddy water that drop on the face 347 can be arranged the right side to automatic two-wheeled cycle 200 easily.The foreign matters such as muddy water that thus, can suppress to be discharged from are rolled by trailing wheel 27 once more.

In addition, the foreign matters such as muddy water that drop on the face 347 are arranged to right-hand, and this is right-hand to be the direction away from throttle valve body 38.Thus, can further suppress effectively foreign matters such as muddy water accumulate in throttle valve body 38 around.

In addition, the foreign matters such as muddy water of landing fall towards downside hastily on the 3rd inclined-plane 353 or the 4th inclined-plane 354.Afterwards, foreign matter such as said muddy water is run into first inclined-plane 351 or second inclined-plane 352 and thus by row to the right.Thus, can foreign matters such as muddy water be discharged from the right side of face 347 effectively.In addition, first inclined-plane 351 and second inclined-plane 352 are little with respect to rake ratio the 3rd inclined-plane 353 and the 4th inclined-plane 354 of left and right vehicle wheel direction Y1.Thus, can reduce size on the short transverse on first inclined-plane 351 and second inclined-plane 352.Corresponding therewith, the size under can reducing on the short transverse of cap assembly 334.Thus, can on vehicle above-below direction Z1, further increase storage case 301, therefore can further increase the capacity of storage case 301.

In addition, face 347 is whole for approaching the rear more with regard to below being in.Thus, can be with the rear of foreign matters such as muddy water of dropping on the face 347 from descending cap assembly 334 to arrange downward cap assembly 334.Thus, can further suppress effectively from the foreign matters such as muddy water that face 347 is discharged turn back to once more connecting rod mechanism 227 near.

In addition, the foreign matters such as muddy water of landing fall towards downside hastily on the 7th inclined-plane 363 or the 5th inclined-plane 361.Afterwards, foreign matter such as said muddy water run into the 8th inclined-plane 364 or the 6th inclined-plane 362 and by row to rear side.Thus, can be easily with the rear side of foreign matters such as muddy water row to automatic two-wheeled cycle 200.In addition, the 8th inclined-plane 364 and the 6th inclined-plane 362 are little with respect to rake ratio the 7th inclined-plane 363 and the 5th inclined-plane 361 of vehicle fore-and-aft direction X1.Thus, can reduce size on the short transverse on the 8th inclined-plane 364 and the 6th inclined-plane 362.Thus, can reduce size on the short transverse on the 8th inclined-plane 364 and the 6th inclined-plane 362.Corresponding therewith, the size under can reducing on the short transverse of cap assembly 334.Therefore thus, the storage case 301 that can on vehicle above-below direction Z1, further extend can further increase the capacity of storage case 301.

In addition, face 347 be configured on the left and right vehicle wheel direction Y1 corresponding to the open spaces R2 between throttle valve body 38 and the auxiliary connecting rod parts 230.Thus, can make through between throttle valve body 38 and the auxiliary connecting rod parts 230 and the foreign matters such as muddy water that fall are fallen on the face 347.As a result, can be with passing through between throttle valve body 38 and the auxiliary connecting rod parts 230 and the foreign matters such as muddy water that fall are arranged the outside to face 347 through face 347.

In addition, face 347 is configured on vehicle fore-and-aft direction X1 corresponding to first and second S. A.s 224, open spaces R2 between 225.Thus, the foreign matters such as muddy water that fall through open spaces R2 are fallen on the face 347.Thus, can the foreign matters such as muddy water that pass through open spaces R2 and fall be arranged the outside to face 347 through face 347.

In addition, in face 347, be formed with right flank 337 being positioned on the vehicle above-below direction Z1 on the ora terminalis 348 of the highest side.Thus, the foreign matters such as muddy water of right flank 337 that can run into longitudinal wall part 335 with on face 347, splashing are to face 347 guiding.Thus, can more easily the foreign matters such as muddy water on the face 347 be discharged from face 347.

In addition, through reinforced rib 369, improved the rigidity of time cap assembly 334.Thus, can suppress the distortion of face 347, therefore can keep the foreign matter of face 347 effectively and discharge effect.

In addition, near the of connecting rod mechanism 227 covered from upper side by last cap assembly 321.Therefore, can suppress foreign matters such as muddy water falls on face 347, first main link component 228, second main link component 229 and the auxiliary connecting rod parts 230.Thus, can further suppress the periphery of foreign body retentions such as muddy water effectively at connecting rod mechanism 227.

That is, at least a portion in the foreign matters such as muddy water that will pass through open spaces R2 and fall is flicked through last cap assembly 321.

In addition, will go up cap assembly 321 forms as one with support 324.Thus, and compare, can reduce number of components with the situation that support is provided with cap assembly mutually independently.

In addition, following cap assembly 334 is fixed on the cylindrical body 220 of throttle valve body 38.Thus, can with descend cap assembly 334 be configured in throttle valve body 38 near.As a result, can reduce cap assembly 334 and throttle valve body 38 whole occupation space down.Thus, can further increase the configuration space of storage case 301.Therefore, can further increase the capacity of storage case 301.

In addition, between the relative portion 333 of the upper wall 243 of the auxiliary connecting rod parts 230 of connecting rod mechanism 227 and guard shield 50, dispose cap assembly 334 down.Thus, can prevent that foreign matters such as muddy water from accumulating between guard shield 50 and the connecting rod mechanism 227.

In addition, guard shield 50 is at least a portion of covering engine main body 21 and the wind guide component that guiding is used for engine main body 21 is carried out the cooling air of forced air-cooling.Owing to be provided with guard shield 50, thereby the space between engine main body 21 and the vehicle seat 16 is by further restriction.Therefore, through making connecting rod mechanism 227 and engine main body 21 approaching fully, can between engine main body 21 and vehicle seat 16, guarantee the spatial accommodation of enough capacity.In this case, through the action that is used for having guaranteed connecting rod mechanism 227 of cap assembly 334 down.

In addition, metal down cap assembly 334 is harder than plastic guard shield 50.Thus, following cap assembly 334 can further improve the effect that flicks foreign matters such as muddy water.In addition, the rigidity of following cap assembly 334 is high.Thus, can suppress that face 347 deforms or face 347 by scratch.Thus, can keep the foreign matter of realizing through face 347 chronically effectively and discharge effect.

In addition, when when right flank is observed, the first imaginary line P1 and the second imaginary line P2 angulation θ 1 are acute angle.In addition, on the lower edge 314 of the pars intermedia 312 of first main link component 228, be formed with bellying 318.Bellying 318 bloats towards auxiliary connecting rod parts 230 sides (rear side).

Through above-mentioned constituted mode, 2 to two imaginary line P1 of upper limb 315 angulation θ of the bellying 318 of first main link component 228 and the pars intermedia 309 of auxiliary connecting rod parts 230, θ 1 is big for the P2 angulation.Therefore, can make foreign matters such as muddy water be difficult to be carried on the upper limb 315 of pars intermedia 309 of auxiliary connecting rod parts 230.

< embodiment 2 >

Figure 18 is the right elevation of the main portion of another embodiment of the present invention, shows a part through the cross section.In addition, Figure 19 is the section drawing of the part of the observed main portion of rear side from vehicle fore-and-aft direction X1.In this embodiment, the difference of main explanation and above-mentioned embodiment marks identical label in the drawings and omits explanation the component parts identical with above-mentioned embodiment.

With reference to Figure 18 and Figure 19, in this embodiment, the fixing seat portion 372 of cap assembly 334 down is fixed in the relative portion 333 of upper wall 243 of guard shield 50.Be formed with a pair of mounting hole of on the vehicle fore-and-aft direction, arranging (not shown) on the cap assembly 334 down.The Screw 374,375 that following cap assembly 334 is run through said mounting hole is fixedly on the right flank of seat portion 372.Thus, following cap assembly 334 is fixed on the guard shield 50 via seat portion 372.

As stated, following cap assembly 334 is fixed on the guard shield 50, thus can with descend cap assembly 334 be configured in guard shield 50 upper wall 243 relative portion 333 near.As a result, can reduce cap assembly 334 and guard shield 50 whole occupation space down.Thus, can further increase the configuration space of storage case 301, therefore can further increase the capacity of storage case 301.

< embodiment 3 >

Figure 20 is the section drawing of the part of the main portion of observation another embodiment of the invention from the right side.In this embodiment, the difference of main explanation and embodiment 1 is to mark identical label and omit explanation with embodiment 1 identical component parts in the drawings.

In this embodiment, storage case 301A is configured to form longitudinal wall parts 384.Mainly the difference to the storage case 301 of storage case 301A and embodiment 1 describes.

Storage case 301A is formed the box that upper surface opens wide, and this storage case 301A comprises antetheca 376, diapire 377, rear wall 378 and pair of right and left sidewall 379.In Figure 20, the sidewall 379 on right side has omitted diagram.The sidewall 379 on right side is symmetrical shape with the sidewall 379 in left side.

Antetheca 376 is configured in the place ahead of engine unit 20.On vehicle above-below direction Z1, this antetheca 376 is from more extending to than the upper wall 243 of guard shield 50 more on the position near the below near the position of top than connecting rod mechanism 227.In addition, on vehicle above-below direction Z1, antetheca 376 extends to the position of leaning on the below than the upper end of cylinder head 23.Antetheca 376 links via the leading section of hinge 331 with vehicle seat 16.

Diapire 377 comprises first 380, second portion 381, third part 382 and the 4th part 383.These first～the 4th parts 380～383 are arranged in order from the place ahead to the rear.

First 380 rearward roughly extends towards cylinder head 23 from the bottom of antetheca 376 as the crow flies.Second portion 381 extends towards the top from the rearward end of first 380.On vehicle above-below direction Z1, the upper end of second portion 381 is positioned at than the upper end of cylinder head 23 to be leaned on the position of top.The upper end of second portion 381 forms agley, and just is in the rear more near upside.

Third part 382 is configured in the top of engine unit 20, and from upside covering engine unit 20.The 4th part 383 tilts with regard to the mode that is in the top more to approach rear side.The rearward end of the rearward end of the 4th part 383 and driving section 26 is roughly relative on above-below direction.

The rearward end of the 4th part 383 is provided with rear wall 378.

First and second parts 380,381 through said antetheca 376, diapire 377 have formed longitudinal wall parts 384.Defined the front end of time side space G1 through longitudinal wall parts 384.Bottom wall part 384 is configured in the place ahead of the cylinder head 23 of engine unit 20, and is configured in the place ahead of connecting rod mechanism 227.

In this case, mud that front-wheel splashes or water are received longitudinal wall parts 384 blocking-up of case 301A, thereby can not arrive connecting rod mechanism 227.

< other embodiments >

The invention is not restricted to the embodiment explained through above-mentioned record and accompanying drawing, for example following embodiment is also included within the technical scope of the present invention.

(1) face of cap assembly also can be crooked arcuation face down.In addition, the inclination of the face of following cap assembly can be fixed on the left and right vehicle wheel direction.In addition, the inclination of the face of following cap assembly can be fixed on the vehicle fore-and-aft direction.

(2) face of cap assembly also can approach left with regard to below being in more down, and said left is the direction near throttle valve body.

(3) face of cap assembly also can just be in the below near vehicle front side more down.

(4) down the face of cap assembly also can be only to tilt and on the vehicle fore-and-aft direction, do not have the face of difference of height in the left and right vehicle wheel direction.

(5) down the face of cap assembly also can be only to have upwardly sloped front and rear sides and on the left and right vehicle wheel direction, do not have the face of difference of height at vehicle.

(6) face of cap assembly is not limited to two the different inclined-planes of inclination on the left and right vehicle wheel direction down, also can arrange the different inclined-planes more than three on the left and right vehicle wheel direction.In this case, the arrangement mode on each inclined-plane on the angle of inclination on each inclined-plane and the left and right vehicle wheel direction can carry out various combinations.

(7) face of cap assembly is not limited to two the different inclined-planes of inclination on the vehicle fore-and-aft direction down, also can arrange the different inclined-planes more than three on the vehicle fore-and-aft direction.In this case, the arrangement mode on each inclined-plane on the angle of inclination on each inclined-plane and the left and right vehicle wheel direction can carry out various combinations.

(8) the formation scope of the face of the following cap assembly on the vehicle fore-and-aft direction also can be only corresponding to the scope of the part between the central axis separately of first and second S. A.s.

(9) the formation scope of the face of the following cap assembly on the left and right vehicle wheel direction also can be only corresponding to the scope of the part in the right part of throttle valve body and the space between the auxiliary connecting rod parts.

(10) cap assembly both can be formed on the cylindrical body of throttle valve body down, also can be formed on the upper wall of guard shield.Guard shield also can cover whole engine main body.

(11) center of oscillation of each main link component, promptly central axis and second S. A. of first S. A. central axis towards being not limited to horizontal direction, also can be direction with respect to inclined.

(12) cap assembly also can not have the longitudinal wall part that erects to the top down.

(13) cap assembly also can not have reinforced rib down.

(14) going up cap assembly also can be the support used with flow regulating valve drag-line parts independently mutually.

(15) when when right flank is observed, the lower edge of the pars intermedia of first main link component also can not comprise bellying.For example, the lower edge of the pars intermedia of first main link component also can be the straight line with the second imaginary line almost parallel.

(16) cap assembly is not limited to the shape relative with the upper surface of guard shield down.Following cap assembly also can be the relative shape of upper surface with the miscellaneous part that constitutes engine main body.

(17) connecting rod mechanism is not limited to use the first and second main connecting rod mechanisms and auxiliary connecting rod mechanism.Also can adopt other connecting rod mechanisms that can make first throttle valve and the second flow regulating valve interlock and open and close.

(18) on the left of connecting rod mechanism and following cap assembly also can be configured in respect to the central axis of the cylindrical body of throttle valve body.Connecting rod mechanism and following cap assembly when in this case, connecting rod mechanism and following cap assembly are configured in the right side with central axis with respect to the cylindrical body of throttle valve body are symmetrical shape.

(19) secondary free air diffuser organizator is not limited to the shape that forms independently mutually with air inlet pipe.Secondary free air diffuser organizator also can form as one with the parts of formation air inlet pipe such as connection pipe.Even under the situation that secondary free air diffuser organizator and air inlet pipe form mutually independently, the shape of bus also can be different.For example, can omit the 3rd boss, the other end of flexible pipe is embedded into the 4th boss fix.In addition, can omit the 4th boss, and fix forming groove on first boss and in this groove, embed the 3rd boss.In addition, can omit the 3rd boss and the 4th boss, the end of flexible pipe directly is fixed on first boss.In addition, can on the cylindrical body of throttle valve body, form groove, and the end of flexible pipe is fixed in this groove.

(20) also can form a plurality of through holes and form mesh-shape on the cap assembly down.For example, can form down cap assembly through metal gauze.

(21) the longitudinal wall parts that define down the front end of side space are not limited to above-mentioned each embodiment.The miscellaneous part of the front end that defines down side space also can be set.

(22) shown in figure 21, airfilter 386 also can be configured in the top of engine main body 21.Airfilter 386 is with respect to the position of engine main body 21 constrained not.

Claims (16)

1. automatic two-wheeled cycle comprises:

The upwardly extending body shell in the vehicle front and back;

By the vehicle seat of said body shell supporting;

Be configured in the storage case of the following side space of said vehicle seat;

Be configured in said vehicle seat the place ahead put sole;

Engine unit, this engine unit is supported by said body shell with the state that can on above-below direction, swing, and is configured in the below of the said storage case in the said side space down; And

Define the said longitudinal wall parts of the front end of side space down;

Said engine unit comprises:

Engine main body, this engine main body comprises cylinder head, this cylinder head also constitutes the part with said combustion chamber bonded assembly master free air diffuser in a part that forms combustion chamber;

Air inlet pipe, this air inlet pipe is connected with said cylinder head, and forms said main free air diffuser with said cylinder head;

Throttle valve body, this throttle valve body is configured in the top of said engine main body, and has the first throttle valve and second flow regulating valve, and said first throttle valve and said second flow regulating valve are configured in to devices spaced apart in the said air inlet pipe on the flow direction of air inlet;

Fuel Injection Device, this Fuel Injection Device is installed on the said cylinder head, and has the injection cock of the said main free air diffuser burner oil in said cylinder head;

Secondary free air diffuser organizator; This pair free air diffuser organizator forms secondary free air diffuser, and this pair free air diffuser divides expenditure and said air inlet imported to the jet space during at least at tickover from said main free air diffuser between said first throttle valve and said second flow regulating valve;

Connecting rod mechanism, this connecting rod mechanism is configured in the top of said engine main body, and is connected with said second flow regulating valve so that said first throttle valve and the said second flow regulating valve interlock with said first throttle valve; And

Following cap assembly, this time cap assembly is relative with said connecting rod mechanism between said connecting rod mechanism and said engine main body, and has with respect at least one the direction bevelled face (347) in left and right vehicle wheel direction and the said vehicle fore-and-aft direction.

2. automatic two-wheeled cycle as claimed in claim 1, wherein,

Said throttle valve body comprises respectively first S. A. and second S. A. that said first throttle valve and said second flow regulating valve can be supported rotatably,

Said connecting rod mechanism comprises: respectively around first main link component and second main link component of said first S. A. and said second rotation axis oscillating; And the auxiliary connecting rod parts, these auxiliary connecting rod parts are configured in the downside of said first S. A. and said second S. A., and said first main link component and said second main link component are linked up each other;

Said (347) are relative with said auxiliary connecting rod parts.

3. automatic two-wheeled cycle as claimed in claim 1, wherein,

Said connecting rod mechanism is configured in the side on the said left and right vehicle wheel direction at center (S1) of said throttle valve body,

Said (347) tilt towards the said side on the said left and right vehicle wheel direction from said center (S1) side of said throttle valve body.

4. automatic two-wheeled cycle as claimed in claim 1, wherein,

Said connecting rod mechanism is configured in the side on the said left and right vehicle wheel direction at center (S1) of said throttle valve body,

Said (347) comprising: first (351,352), and this first (351,352) are configured in the side on the said left and right vehicle wheel direction, and just are in the below more the closer to a said side; And second (353,354), this second (353,354) are configured in the opposite side on the said left and right vehicle wheel direction and extend towards said first (351,352), and just are in the below more the closer to a said side of said left and right vehicle wheel direction,

On said left and right vehicle wheel direction, the inclination of said second (353,354) is greater than the inclination of said first (351,352).

5. automatic two-wheeled cycle according to claim 1, wherein,

Said (347) lean on the rear of vehicle just to be in the below more more.

6. automatic two-wheeled cycle according to claim 1, wherein,

Said (347) comprising: the 3rd (362,364), the 3rd (362,364) lean on the rear of vehicle just to be in the below more more; Fourth face (361,363), this fourth face (361,363) disposes than the more forward side of said the 3rd face, and extends towards said the 3rd (362,364), and leans on the rear of vehicle just to be in the below more more,

On said vehicle fore-and-aft direction, the inclination of said fourth face (361,363) is greater than the inclination of said the 3rd (362,364).

7. automatic two-wheeled cycle according to claim 2, wherein,

Said connecting rod mechanism is configured in a side of said throttle valve body on said left and right vehicle wheel direction,

Said (347) be configured on the said left and right vehicle wheel direction corresponding to being formed between said throttle valve body and the said auxiliary connecting rod parts and in space (R2) that said vehicle upper and lower is open upwards.

8. automatic two-wheeled cycle according to claim 2, wherein,

Said connecting rod mechanism is configured in a side of said throttle valve body on said left and right vehicle wheel direction,

Said (347) be configured on the said vehicle fore-and-aft direction corresponding to being formed between said first S. A. and said second S. A. and in space (R2) that the vehicle upper and lower is open upwards.

9. automatic two-wheeled cycle according to claim 1, wherein,

Said cap assembly down comprises the wall that on the vehicle above-below direction, erects along the ora terminalis of the high side on the vehicle above-below direction in said (347).

10. automatic two-wheeled cycle according to claim 1, wherein,

The part of the formation said (347) in the said cap assembly down forms the tabular of bending, and said cap assembly down comprises the reinforced rib that extends along the curved shape of the part that forms said (347).

11. automatic two-wheeled cycle according to claim 2, wherein,

Said connecting rod mechanism is configured in a side of said throttle valve body on said left and right vehicle wheel direction,

Said automatic two-wheeled cycle also comprises cap assembly; Should go up cap assembly in the position that is configured on the vehicle above-below direction above more leaning on than said first S. A. and said second S. A., and from the top of said vehicle above-below direction cover said connecting rod mechanism near.

12. automatic two-wheeled cycle according to claim 11, wherein,

Saidly go up cap assembly and bracket-shaped becoming one, a flow regulating valve cable that is connected in said bearing bracket and said first main link component and said second main link component.

13. automatic two-wheeled cycle according to claim 1, wherein,

Said throttle valve body comprises cylindrical body, and this cylindrical body forms the part of said air inlet pipe, and holds said first throttle valve and said second flow regulating valve,

Said cap assembly down is fixed on the said cylindrical body.

14. automatic two-wheeled cycle according to claim 1, wherein,

The guard shield that comprises at least a portion that covers said engine main body,

Said cap assembly down is configured in the top of said guard shield.

15. automatic two-wheeled cycle according to claim 14, wherein,

Said cap assembly down is fixed on the said guard shield.

16. automatic two-wheeled cycle according to claim 14, wherein,

Said cap assembly down uses the material harder than said guard shield to form.

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