CN100532150C - Wind guide structure of internal combustion engine for vehicle - Google Patents

Abstract

The present invention provides an internal combustion engine for vehicles, comprising a working cylinder part which is set in a manner that its axe faces to the rough frontage of the advancing direction of a vehicle and can guide the running wind to plug jacks with a simple structure. In the engine (20), the working cylinder part (22) can take in gas piston (40) in a formation of reciprocating action. the working cylinder part (22) is set in a manner that its axe (C) faces to the rough frontage of the advancing direction of a vehicle, wherein, a first air deflector (78) for guiding the running wind to the a plug jack (66) is mounted at the road surface side of the cylinder cover (24) of the working cylinder part (22), a second air deflector (79) for guiding the running wind to the first air deflector (78) is mounted at the road surface side of the cylinder cover mask (25) of the working cylinder part (22).

Description

The vehicle air guide structure of combustion engine

Technical field

The present invention relates to the vehicle combustion engine that clutch release slave cylinder portion disposes in the mode of its axis towards roughly the place ahead of vehicle direct of travel.

Background technology

In the past,, had and be provided with in the combustion engine at vehicle to the travel structure (for example, with reference to patent documentation 1) of deflector shield of wind of the cylinder head cover guiding of clutch release slave cylinder portion.

Patent documentation 1: open clear 58-6624 communique in fact

But above-mentioned combustion engine is a clutch release slave cylinder portion with its axis structure of disposing of the mode towards the top roughly, has accelerated by the flow velocity of the wind that travels directly over the cylinder head cover and the cooling that has improved jack.And clutch release slave cylinder portion with its axis roughly in the combustion engine that the mode in the place ahead disposes because after the wind of travelling strokes the cylinder head cover front end of clutch release slave cylinder portion, avoid jack and rearward flow, so hope improves this aspect.

Summary of the invention

The present invention is in view of the above problems and research and development, and its purpose is to provide a kind of vehicle combustion engine, and its clutch release slave cylinder portion disposes in the mode of axis towards roughly the place ahead of vehicle direct of travel, can be with the simple structure wind jack that leads that will travel.

In order to address the above problem, the vehicle of the first aspect present invention air guide structure of combustion engine (for example driving engine 20 of embodiment), this vehicle take in piston (for example piston 40 of embodiment) with the clutch release slave cylinder portion (for example clutch release slave cylinder portion 22 among the embodiment) of combustion engine but and make the piston crank motion, this clutch release slave cylinder portion disposes in the mode of its axis (for example axis C of embodiment) towards roughly the place ahead of vehicle direct of travel, wherein, be provided with lead first deflector shield (for example first deflector shield 78 of embodiment) of first jack (for example first jack 66 of embodiment) of the wind that travels in the road surface side of the cylinder cap (for example cylinder cap 24 of embodiment) of described clutch release slave cylinder, and be provided with lead second deflector shield (for example second deflector shield 79 of embodiment) of described first deflector shield of the wind that travels in the road surface side of the cylinder head cover (for example cylinder head cover 25 of embodiment) of described clutch release slave cylinder.

Second aspect present invention forms the lead guiding shape portion (for example the teat 81 that tilts of embodiment, circular-arc 82 down) of described second deflector shield of the wind that will travel on described cylinder head cover.

Third aspect present invention is fixed on bolt (for example tie bolt 83 of embodiment) setting of setovering in order to dodge described guiding shape portion on the described cylinder cap with described cylinder head cover.

Fourth aspect present invention, described cylinder head cover and described second deflector shield are structure as a whole.

Fifth aspect present invention, described cylinder cap and described first deflector shield are structure as a whole.

Sixth aspect present invention, two light-up plugs (プ ラ グ) (for example each light- up plug 64,65 of embodiment) are installed on the described cylinder cap, and be provided with air-casing (for example air-casing 69 of embodiment), in this air-casing, import the described wind that travels cooling around described first jack, second jack.

According to first aspect present invention, suppress to blow the situation that the wind that travels that arrives to the cylinder head cover front end is avoided first deflector shield and rearward flow, by the synergy of each deflector shield, therefore the jack that the wind that travels can be led well, can improve jack cooling on every side.

According to second aspect present invention, owing to blow led well second deflector shield and supply with of the wind that travels that arrives to the cylinder head cover front end to jack, so can further improve jack cooling on every side.

According to third aspect present invention and since along guiding shape portion flow travel wind not by cylinder head cover fixedly the bolt of usefulness hinder and be directed to second deflector shield well, so can further improve jack cooling on every side.

According to fourth aspect present invention, can be the cylinder head cover and second deflector shield is integrally formed by cast aluminium etc., so can seek the reduction of cost by cutting down number of parts.

According to fifth aspect present invention, can be the cylinder cap and first deflector shield is integrally formed by cast aluminium etc., so can seek the reduction of cost by cutting down number of parts.

According to sixth aspect present invention, can cool off the cylinder cap of driving engine effectively and make the action of this driving engine stable with two light-up plugs.

Description of drawings

Fig. 1 is the left surface figure of the autobicycle of the embodiment of the invention;

Fig. 2 is the top figure of the configuration of expression driving engine of above-mentioned autobicycle and freeing pipe etc.;

Fig. 3 is the right hand view of above-mentioned driving engine and freeing pipe;

Fig. 4 is the expansion section-drawing of above-mentioned driving engine;

Fig. 5 is above-mentioned driving engine and section-drawing cylinder main body axis quadrature;

Fig. 6 is a section-drawing above-mentioned driving engine and orthogonal axe cylinder cap;

Fig. 7 is the right hand view that is equivalent to Fig. 3 of configuration of the light-up plug of the above-mentioned driving engine of expression;

Fig. 8 is the instruction diagram of the clutch release slave cylinder portion of the above-mentioned driving engine seen from the left side;

Fig. 9 be along the axis of the clutch release slave cylinder portion of observing above-mentioned driving engine from the front side to view.

Description of reference numerals

1 autobicycle (vehicle)

20 driving engines (combustion engine)

22 clutch release slave cylinder portions

24 cylinder caps

25 cylinder head covers

40 pistons

64 first light-up plugs (light-up plug)

65 second light-up plugs (light-up plug)

66 first jacks (jack)

67 second jacks (jack)

69 air-casings

78 first deflector shields

79 second deflector shields

81 teats (guiding shape portion) that tilt

82 times circular-arc (guiding shape portion)

83 tie bolts (bolt)

The C axis

The specific embodiment

Below, with reference to the description of drawings embodiments of the invention.In addition, below wait direction all around in the explanation, unless otherwise noted, then the direction with vehicle is consistent.In addition, arrow flag F R represents vehicle front among the figure, and arrow label L H represents the vehicle left, and arrow mark UP represents the vehicle top.

In autobicycle shown in Figure 1 (vehicle) 1, on the head pipe 3 of the leading section that is positioned at vehicle frame 2, via can operate the rudder front fork 5 about the ground pivot suspension of deflecting bar 6,5 pairs of front-wheels of this front fork 4 carry out axle and support.The steering tiller 7 of the usefulness of operating the rudder is installed on the top of deflecting bar 6.

Vehicle frame 2 forms so-called backbone type, that is, make one to be responsible for 8 and from the beginning to manage 3 and extend to the oblique back lower place, improves and strides the property taken advantage of as lower curtate between the seat 9 that head pipe 3 and occupant are used.Engage a pin plate 10 about having in the rearward end of being responsible for 8, leading section of pivot suspension rocking arm 12 swingably on pin plate 10 about this, 12 pairs of trailing wheels of this rocking arm 11 carry out axle and support.

The rear portion of being responsible for 8 engage that oriented oblique back upper place extends about the leading section of seat frame 13, between the left and right arms rearward end of the front and back of this left and right sides seat frame 13 pars intermedia and rocking arm 12, the posterior bumper 14 about disposing respectively.Have before and after above left and right sides seat frame 13, being configured in chaufeur with and the described seat 9 of the seat surface used of rear portion occupant.In addition, the pedal that Reference numeral 15 expression chaufeurs are used, the pedal that Reference numeral 16 expression rear portion occupants use.

Dispose driving engine (combustion engine) 20 as the primary mover of autobicycle 1 in the central lower inboard (described lower curtate inboard) of vehicle frame 2.Driving engine 20 is crankshaft revolution axis air-cooled type single cylinder engines along overall width direction (left and right directions), has from the leading section of its crankcase 21 to found the basic structure that is provided with clutch release slave cylinder portion 22 to vehicle front.On the pin plate 10 about driving engine 20 is bearing in the rear portion of crankcase 21 up and down, and via driving engine suspension 8a with the upper support of crankcase 21 at the front and back pars intermedia of being responsible for 8, thus, driving engine 20 is carried on vehicle frame 2.

On the cylinder cap of clutch release slave cylinder portion 22 front, connect the downstream of throttle body 26 from the top, connect the base end side of freeing pipe 27 from the below.Upstream side at throttle body 26 is connected with the air filter case 26a that is responsible for the supporting of 8 underside of forward.

In conjunction with Fig. 2, freeing pipe 27 direction one end the place ahead under cylinder cap is crooked and extend, in the place aheads slightly of clutch release slave cylinder portion 22 front ends after turning back in the left back, oblique left down in clutch release slave cylinder portion 22 rearward extends on almost parallel ground with it, then, below crankcase 21, change to overall width direction substantial middle, be connected with the leading section (base end part) of the silencer 27a that is positioned at driving engine 20 rears.The clutch release slave cylinder portion that the is positioned at 22 oblique positions of left down at freeing pipe 27 are provided with catalytic convertor (the following catalyst that also abbreviates as) 28 (with reference to Fig. 5) that exhaust purification is used.Silencer 27a, sees with the anterior modes that overlap of trailing wheel 11 with the side and rearward to extend from this extension to trailing wheel 11 right-hand extensions from the base end part between driving engine 20 rear ends and trailing wheel 11 front ends, sees roughly L shaped thus above the formation.

Rotary power from driving engine 20 is exported to the drive sprocket 32 in left side, crankcase 21 rear portions via each power-transfer clutch described later and the change-speed box 31 (with reference to Fig. 4) that are accommodated in the crankcase 21, transmits via the driven sprocket 34 of driving chain 33 to trailing wheel 11 left sides from this drive sprocket 32.

The clutch release slave cylinder portion 22 of the front portion of vehicle frame 2, driving engine 20, throttle body 26 and air filter case 26a etc. are synthesized resinous front body cover 35 and cover.Front body cover 35 yet double as protection driver's foot is not subjected to effect from the air baffle of the blast in the place ahead etc.In addition, the rear portion of vehicle frame 2 is synthesized resinous rear body cover 36 coverings equally.This rear body cover 36 together supports seat 9 with left and right sides seat frame 13.Configuration is positioned at article container 37 under the seat 9 in rear portion vehicle frame 2, and, in the underside of forward configuration of this article container 37 by the Fuel Tank 38 of the front portion of left and right sides seat frame 13 supporting.

As shown in Figure 3, the clutch release slave cylinder portion 22 of driving engine 20 make its axis C with respect to ground approximate horizontal (in detail slightly to the front upper place) and from crankcase 21 leading sections forwards (vehicle direct of travel) outstanding, main composition is installed on the clutch release slave cylinder main body 23 of crankcase 21 leading sections, the described cylinder cap 24 of leading section that is installed in this clutch release slave cylinder main body 23 and the cylinder head cover 25 that is installed in the leading section of this cylinder cap 24 thus.Below, the fore-and-aft direction parallel with the described axis C (clutch release slave cylinder axis) of clutch release slave cylinder portion 22 is called the clutch release slave cylinder fore-and-aft direction, will be called the clutch release slave cylinder above-below direction with the above-below direction of described axis C quadrature.

In conjunction with Fig. 4, clutch release slave cylinder main body 23 portion within it forms cylinder barrel 39 along described axis C, but is embedded with piston 40 in this cylinder barrel 39 reciprocating action.Piston 40 swingingly is connected with the small end of connecting rod 41 freely via the piston pin along left and right directions, and the big end of this connecting rod 41 is connected with bent axle 42 freely rotatably via the Crankpin along left and right directions.Bent axle 42 via about crank arm Crankpin be bearing in along between the left and right sides axial region of left and right directions.

Right part at bent axle 42 disposes centrifugal clutch 29 coaxially, and via this centrifugal clutch 29, the rotary power corresponding to its rotating speed with bent axle 42 is delivered to primary drive gear 43.Primary drive gear 43 is configured on the right axial region of bent axle 42 coaxially, elementary driven gear 44 engagements on this primary drive gear 43 and main shaft 45 right sides that are configured in bent axle 42 rears coaxially.Main shaft 45 disposes abreast at rear and its left and right sides axial region of bent axle 42, dispose coaxially in its right part can be by chaufeur the operation multi-plate power-transfer clutch 30 of transferring power intermittently, the rotary power that will be input to elementary driven gear 44 via this multi-plate power-transfer clutch 30 transmits to main shaft 45.

Main shaft 45 and the countershaft 46 of configured in parallel at its rear together support change-gear set (among Fig. 4 only the chimeric mutually one group of variable gear of expression to) 47.Mainly constitute change-speed box 31,, the reduction ratio of described change-gear set 47 is changed multistagely via not shown speed-changing mechanism by the operation of chaufeur by these main shafts 45, countershaft 46 and change-gear set 47.The left part of countershaft 46 is outstanding outside crankcase 21, and described drive sprocket 32 is installed in this left part.

Cylinder cap 24 is positioned at top dead point with the front opening of inaccessible cylinder barrel 39 piston 40 together forms the combustion chamber of so-called pentroof.Driving engine 20 among this embodiment is OHC dual valve types, and distributing in two inclined upper of the crestal culmination formation portion 48 of described combustion chamber forms the single combustion chamber side opening of admission port 49 or exhausr port 50.These each combustion chamber side openings are respectively by air inlet valve 51 or blow off valve 52 and open and close.

Each mouthful the 49, the 50th, the circulation path that the freeing pipe installation portion 54 of the throttle body installation portion 53 on described combustion chamber and cylinder cap 24 tops or cylinder cap 24 bottoms is communicated with, roughly extend to oblique the place ahead from the combustion chamber side opening orthogonally with described inclined upper, then upward or the below crooked and arrive throttle body installation portion 53 or freeing pipe installation portion 54.Throttle body installation portion 53 and freeing pipe installation portion 54 forms and clutch release slave cylinder above-below direction plane orthogonal roughly, on this each plane butt and connect the insulator of fixed knot valve main body 26 or freeing pipe 27 in conjunction with flange.

The pole of each valve 51,52 and described inclined upper roughly quadrature geosyncline the place ahead are extended and the inwall of perforation air intake- exhaust mouth 49,50, engage with the leading section of air inlet side or exhaust side Rocker arm 55,56 respectively at its leading section then.The other end of each Rocker arm 55,56 respectively with two cam point moving contacts that are formed on single camshaft 57, the driving by this camshaft 57 makes each valve 51,52 along its pole reciprocating action the combustion chamber side opening of each mouthful 49,50 be opened and closed.The pole of each valve 51,52, each Rocker arm 55,56 and camshaft 57 etc. are supported in the anterior inboard of cylinder cap 24, and these parts are incorporated in by cylinder cap 24 in the valve gear housing anterior and that the cup-shaped cylinder head cover 25 of cylinder cap 24 obturations is formed.

Be fixed with coaxially by movable sprocket 58 in the left part of camshaft 57, hung with annular cam chain 60 by cover on movable sprocket 58 and the drive sprocket 59 that is fixed on bent axle 42 left parts coaxially at this.Thus, camshaft 57 drives with bent axle 42 interlocks, and each valve 51,52 is opened and closed.In addition, dispose not shown electrical generator coaxially in the left part of bent axle 42.

With reference to Fig. 5, at the integrally formed a plurality of cooling element 61a of the periphery of clutch release slave cylinder portion 22,61b.In detail,, roughly form a plurality of sidepiece cooling element 61a orthogonally, about clutch release slave cylinder main body 23, form a plurality of cooling element 61b up and down with clutch release slave cylinder axis C almost parallel ground with clutch release slave cylinder axis C in the right side of clutch release slave cylinder main body 23 and cylinder cap 24.

In the left side of clutch release slave cylinder portion 22, form the cam chain chamber 62 of taking in described cam chain 60.Cam chain chamber 62 also can be used as and makes the return path that the engine oil that supplies in the cylinder cap 24 returns and work in crankcase 21, and be provided with oil temperature sensor 63, the test section of this oil temperature sensor 63 is in the face of in this cam chain chamber 62 and the detection of engine oil temperature.Oil temperature sensor 63 is positioned at the lower-left side and near the crankcase 21 (with reference to Fig. 8) of clutch release slave cylinder main body 23, and is installed on the clutch release slave cylinder main body 23 in the mode of inserting from the left side.In addition, Reference numeral 60a represents cam chain 60 is given the cam chain tension device of regulation tension force.In addition, described catalyst 28 is positioned at the below (the oblique lower left of clutch release slave cylinder portion 22) of cam chain chamber 62.

With reference to Fig. 6, cam chain chamber 62 forms the space of the flats that has suppressed left and right sides width in the left side of clutch release slave cylinder main body 23 and cylinder cap 24, surround the outside with the inner wall part 62a of clutch release slave cylinder inwall one and the upper inside wall portion 73 that links to each other with its top by the outside wall portions 62b of section コ shape.That is, the heat output in the cylinder barrel 39 does not directly transmit to the exterior wall 62b of cam chain chamber 62, therefore, does not form cooling element at outside wall portions 62b (left side of clutch release slave cylinder portion 22).

At this, as Fig. 6, shown in Figure 7, driving engine 20 is exported, is sought low burnupization and carry out plug with double sparkization in order to improve combustion performance and raising, that is,, first light-up plug 64 is installed from oblique front lower place in the bottom of its cylinder cap 24, in the left side of cylinder cap 24, from tiltedly preceding right-hand installation second light-up plug 65.In the bottom of cylinder cap 24 and the left side be formed for making each light- up plug 64,65 to arrive first and second jack 66,67 of the described crestal culmination formation portion 48 of its inboards respectively.Screw thread is fixed in the external screw thread hole that is formed in the crestal culmination formation portion 48 each light- up plug 64,65 by cooresponding jack 66,67, and is fixed on the cylinder cap 24 under in the face of the state in the combustion chamber in its preceding termination electrode portion.

First light-up plug 64 with left and right directions roughly the relative clutch release slave cylinder above-below direction of plane orthogonal face tilt, and its central axis see at the clutch release slave cylinder axis direction (along clutch release slave cylinder axis C to looking) with the bearing of trend almost parallel (with the above-below direction almost parallel) of air intake-exhaust mouth 49,50.And second light-up plug 65 with the clutch release slave cylinder above-below direction roughly in the plane orthogonal relative left and right directions tilt, and its central axis is seen and the bearing of trend of air intake- exhaust mouth 49,50 quadrature (with the left and right directions almost parallel) roughly at the clutch release slave cylinder axis direction.In other words, each light- up plug 64,65 sees that at the clutch release slave cylinder axis direction formation is roughly L shaped.In addition, the mode that first light-up plug 64 is positioned at clutch release slave cylinder axis C left side with its central axis settings of setovering, second light-up plug 65 and line of centers thereof are positioned at the setting of setovering of mode above the clutch release slave cylinder axis C.

Admission port 49 makes its combustion chamber side opening be positioned at the top of crestal culmination formation portion 48 and the left side of clutch release slave cylinder axis C, from this opening roughly upward (in detail slightly to the right tilt) extend arrive be positioned at clutch release slave cylinder axis C roughly directly over throttle body installation portion 53.On the other hand, exhausr port 50 makes its combustion chamber side opening be positioned at the bottom of crestal culmination formation portion 48 and the right side of clutch release slave cylinder axis C, (tilts) extension in detail slightly to the right roughly downwards and arrives the freeing pipe installation portion 54 that is positioned at clutch release slave cylinder axis C right side from this opening.Freeing pipe installation portion 54 is setovered to the right and is increased the aperture area of running air inlet 75.

Be provided with exhaust sensor (oxygen concentration sensor) 68 on exhausr port 50, it can set the target gas ratio of combustion of air inlet based on the oxygen concentration of exhaust.The sluice gate (catalyst) of exhaust sensor 68 use platinum etc., the test section that makes this exhaust sensor 68 is in the face of in the exhausr port 50 of cylinder cap 24, described thus sluice gate is easy to be heated to the specified action temperature, and the detection sensitivity of (during the low temperature running) raises during warming up.

Exhaust sensor 68 is installed in the mode of inserting the right side, bottom (right side of exhausr port 50) of cylinder cap 24 from the right side.Described first light-up plug 64 is arranged in cylinder cap 24 and clips the opposite side (left side) of exhausr port 50 and exhaust sensor 68, and described second light-up plug 65 is positioned at the homonymy (right side) of exhaust sensor 68.In addition, exhaust sensor 68 leaves the below that distance ground is positioned at clutch release slave cylinder axis C, and its central axis and left and right directions almost parallel.That is, exhaust sensor 68 is seen and first light-up plug 64 quadrature roughly at the clutch release slave cylinder axis direction, with second light-up plug, 65 almost parallels.

At this, driving engine 20 makes the air-casing (cooling airflow path) 69 of cooling air (wind travels) at these cylinder cap 24 internal circulations for effectively that thermal load is big cylinder cap 24 (especially around each jack 66,67) cooling and be provided with.Air-casing 69 forms the space for each jack 66,67 is interconnected between the bottom 70 of the crestal culmination formation portion 48 at cylinder cap 24 rear portions and valve gear housing, that is the logical portion 74 etc. of the inserting space of the tie bolt of the upper inside wall portion 73, clutch release slave cylinder main body 23 that reserves air intake- exhaust formation portion 71,72, cam chain chamber 62 and crankcase 21.Make cooling air (wind travels) circulation around each jack 66,67 well by this air-casing 69, and cooling air (wind travels) can be imported to the inboard of cylinder cap 24, the cooling that improves cylinder cap 24.

First jack, 66 peripheries that air-casing 69 will be opened downwards in the bottom of cylinder cap 24 by the effect of two deflector shields 78,79 described later are as running air inlet 75, and second jack, 67 peripheries that will open to the right in cylinder cap 24 right sides are as running air outlet (exhaust outlet) 76.In other words, air-casing 69 sees that at the clutch release slave cylinder axis direction general curved becomes L shaped from running air inlet 75 to exhaust outlet 76.

Running air inlet 75 (first jack 66) is formed on the tie bolt of exhausr port formation portion 72 and lower left and inserts between the logical portion 74, and exhaust outlet 76 (second jack 67) is formed on the upper right side and bottom-right tie bolt is inserted between the logical portion 74.Running air inlet 75 is seen narrower than the width of exhaust outlet 76 at the clutch release slave cylinder axis direction, first light-up plug 64 is sandwiched in exhausr port formation portion 72 and tie bolt is inserted between the logical portion 74.Exhausr port formation portion 72 (exhausr port 50) and running air inlet 75 and first light-up plug 64 roughly about configuration side by side.In addition, in cylinder cap 24, clip exhausr port formation portion 72 (exhausr port 50) and a side opposite with first light-up plug 64 and running air inlet 75 disposes described exhaust sensor 68.By this configuration, exhaust sensor 68 does not block running air inlet 75.

Being provided with the clutch release slave cylinder axis direction in air-casing 69 sees near the cross-section centre slice 77 in the left and right sides this clutch release slave cylinder axis C.Centre slice 77 is platy structures of crossing over the last lower wall of air-casing 69, and between air intake-exhaust interruption-forming portion 71,72, its left part (running air inlet 75 sides) downwards is obliquely installed.To import to the wind direction exhaust outlet 76 smooth and easy guiding of travelling the air-casing 69 from running air inlet 75 by this centre slice 77, and increase the area of contact of this wind that travels, improve the cooling performance of cylinder cap 24.

As Fig. 8, shown in Figure 9, be provided with first deflector shield 78 in the bottom of cylinder cap 24 (road surface side) with the running air inlet 75 (first jack 66) of the wind that travels (among the figure shown in the long and short dash line) guiding air-casing 69.First deflector shield 78 have below 75 that separate with running air inlet, with the tabular deflector shield main body 78a of left and right directions almost parallel, and a pair of 78b of foot at the both ends, the left and right sides of this deflector shield main body of supporting 78a, being formed on that the clutch release slave cylinder axis direction regards as is open upward roughly コ shape and the wind circulation path of travelling that connects along front and back.

Deflector shield main body 78a tilts to the back upper place, and its rear portion is crooked gradually upward and form the rear wall parts 78c that links to each other below with cylinder cap 24, thus, first deflector shield 78 forms forwards open bag shape, can will enter the wind that travels in this first deflector shield 78 its top sailing introducing port 75 at once that leads well.Be formed with the bottom outlet 78d of horizontal length in rear wall parts 78c left side, a part that the enters into first deflector shield 78 wind direction rear of travelling is passed through.First deflector shield 78 like this and the left side of the freeing pipe installation portion of putting to the lower right lateral deviation of cylinder cap 24 54 be in abutting connection with the lower left side biasing of cylinder cap 24 (in other words to), is integrally formed in the bottom of cylinder cap 24 by aluminium pressure diecasting shaping etc.

Described oil temperature sensor 63 is positioned at the rear (downstream) of first deflector shield 78, in the dead ahead of this oil temperature sensor 63, for suppress wind direction oil temperature sensor 63 blow to and establish retaining wall 80 is upright downwards.Retaining wall 80 is and the axis C platy structure of quadrature roughly, is integrally formed in the bottom of cylinder cap 24 by aluminium pressure diecasting shaping etc., alleviates contacting of ground-surface obstacle and oil temperature sensor 63.

In addition, second deflector shield 79 in the bottom of cylinder head cover 25 (road surface side) is provided with first deflector shield 78 that the wind that travels led.Second deflector shield 79 have below leave with cylinder head cover 25 lower parts, with the tabular deflector shield main body 79a of left and right directions almost parallel, and a pair of 79b of foot at the both ends, the left and right sides of this deflector shield main body of supporting 79a, the wind circulation path of travelling that connects before and after forming, it regards the roughly コ shape that is open upward as at the clutch release slave cylinder axis direction, and in order to see that at the clutch release slave cylinder axis direction the outside with first deflector shield 78 surrounds and is provided with relatively largely.

Deflector shield main body 79a and clutch release slave cylinder axis C almost parallel (relative in detail clutch release slave cylinder axis C tilts to the back upper place slightly), and its front end is positioned near the front end of described cylinder head cover 25, be taken into easily thus and just blown the wind that travels that arrives to cylinder head cover 25 front ends, and the wind that will travel easily leads in first deflector shield 78 at its rear.Second deflector shield 79 like this is integrally formed in the bottom of cylinder head cover 25 to the lower left side bias configuration of cylinder head cover 25 by aluminium pressure diecasting shaping etc.

Tilt teat 81 and time circular-arc 82 in the top in the front end of cylinder head cover 25 left side and bottom are formed for the wind that travels led second deflector shield 79 respectively.The teat 81 that tilts forms following plane or plane of bending, promptly, with the rising wood in the scope of the roughly clutch release slave cylinder axis C of cylinder head cover 25 antethecas top is summit and forwards outstanding, with respect to more forwards tilt the below of the wind that travels from the place ahead can being led well thus more by upside with clutch release slave cylinder axis C plane orthogonal.

Circular-arc 82 forms following plane of bending down, that is, lead angle becomes the side to see the circular-arc of big footpath in the scope below the roughly clutch release slave cylinder axis C of cylinder head cover 25 antethecas, and is offside in the rear by downside more, thus, the wind that travels from the place ahead rearward flows swimmingly along cylinder head cover 25 bottoms.By these tilt teats 81 and circular-arc 82 synergy down, will blow the wind that travels that arrives to cylinder head 25 front ends left side and lead well in second deflector shield 79.

Cylinder head cover 25 is fixed on the substantial middle up and down of its antetheca on the cylinder cap 24 by a pair of tie bolt 83 that connects from the place ahead, a right part configuration that connects cylinder head cover 25 in each tie bolt 83, another connects tilt teat 81 and circular-arc 82 right part configuration down at the left and right sides of cylinder head cover 25 pars intermedia.In other words, each tie bolt 83 is in order to dodge tilt teat 81 and circular-arc 82 and to cylinder head cover 25 right side bias configuration down, and its head does not hinder the flowing of the wind that travels of guiding second deflector shield 79.

At this, as Fig. 3, shown in Figure 5, the for example cellular structure (integral type) that described catalytic convertor 28 will be attached with catalyst such as platinum is accommodated in the housings cylindraceous than freeing pipe 27 big footpaths, in the position of setovering to the oblique left down of clutch release slave cylinder portion 22, roughly be arranged on freeing pipe 27 coaxially midway, this catalyst 28 will suitably purify by the exhaust from driving engine 20 herein under the state of the reaction promotion temperature that is heated to regulation.The tiltedly down left that catalyst 28 is positioned at clutch release slave cylinder portion 20 is the below of cam chain chamber 62, and the heat with the catalyst 28 of heated condition is not directly delivered to the clutch release slave cylinder inwall.In addition, catalyst 28 is from the running air inlet 75 of described air-casing 69 bias configuration to the left, and the heat of catalyst 28 is difficult for invading in the air-casing 69.

As described above, but take in piston 40 clutch release slave cylinder portion 22 reciprocating actions of the driving engine 20 in the foregoing description, this clutch release slave cylinder portion 22 disposes towards the mode in roughly the place ahead of vehicle direct of travel with its axis C, be provided with lead first deflector shield 78 of first jack 66 of the wind that travels in the road surface side of the cylinder cap 24 of described clutch release slave cylinder portion 22, and in the road surface side of the cylinder head cover 25 of described clutch release slave cylinder portion 22 from being provided with lead second deflector shield 79 of described first deflector shield 78 of the wind that travels.

According to this structure, suppress to blow the situation that the wind that travels that arrives to cylinder head cover 25 front ends is avoided first deflector shield 78 and rearward flow, by the synergy of each deflector shield 78,79, air-casing 69 well can lead the wind that travels, therefore, can improve the cooling on every side of each jack.

In addition, in above-mentioned driving engine 20, by on described cylinder head cover 25, forming the wind that to travel lead tilt teat 81 and circular-arc 82 down of described second deflector shield 79, blow led well second deflector shield 79 and supply with of the wind that travels that arrives to cylinder head cover 25 front ends to first jack 66, therefore, can further improve jack cooling on every side.

In addition, in above-mentioned driving engine 20, the tie bolt 83 that described cylinder head cover 25 is fixed on the described cylinder cap 24 reaches circular-arc 82 and the biasing setting in order to dodge the described teat 81 that tilts, along tilt teat 81 and flow for circular-arc 82 down travel wind not by cylinder head cover 25 fixedly usefulness tie bolt 83 obstructions and be directed to second deflector shield 79 well, therefore, can further improve jack cooling on every side.

And then, in above-mentioned driving engine 20, be structure as a whole by making described cylinder head cover 25 and described second deflector shield 79, can be the cylinder head cover 25 and second deflector shield 79 is integrally formed by cast aluminium etc., therefore, can seek the reduction of cost by cutting down number of parts.

In above-mentioned driving engine 20, be structure as a whole by making described cylinder cap 24 and described first deflector shield 78, can be the cylinder cap 24 and first deflector shield 78 is integrally formed by cast aluminium etc., therefore, can seek the reduction of cost by cutting down number of parts.

In addition, in above-mentioned driving engine 20, two light-up plugs 64,65 are installed on described cylinder cap 24, and be provided with air-casing 69 with cooling around the jack, in this air-casing 69, import the described wind that travels, thus, can cool off the cylinder cap 24 of air cooled engine 20 and make the action of this driving engine 20 stable effectively with two light-up plugs 64,65.

In addition, the invention is not restricted to the foregoing description, also applicable to for example, do not have plug with double spark and only have the driving engine of single light-up plug, on cylinder cap, be provided with two camshafts that air intake-exhaust uses the DOHC driving engine, do not use rocking arm and by the direct act engine of camshaft direct drive valve, have at least a driving engine and multi-cylinder engine or watercooled engine in a plurality of air inlets, the blow off valve.

And the structure of the foregoing description is an example of the present invention, obviously also applicable to various vehicles such as scooter-type vehicles, can carry out various changes in the scope that does not break away from main idea of the present invention.

Claims (6)

1. a vehicle is with the air guide structure of combustion engine, but this vehicle is taken in piston and is made the piston crank motion with the clutch release slave cylinder portion of combustion engine, described clutch release slave cylinder portion disposes in the mode of its axis towards roughly the place ahead of vehicle direct of travel, it is characterized in that: be provided with lead first deflector shield of first jack of the wind that travels in the road surface side of the cylinder cap of described clutch release slave cylinder, and be provided with lead second deflector shield of described first deflector shield of the wind that travels in the road surface side of the cylinder head cover of described clutch release slave cylinder.

2. vehicle as claimed in claim 1 is characterized in that with the air guide structure of combustion engine: form the lead guiding shape portion of described second deflector shield of the wind that will travel on described cylinder head cover.

3. vehicle as claimed in claim 2 is characterized in that with the air guide structure of combustion engine: described cylinder head cover is fixed on bolt setting of setovering in order to dodge described guiding shape portion on the described cylinder cap.

4. as the air guide structure of each described vehicle of claim 1～3 with combustion engine, it is characterized in that: described cylinder head cover and described second deflector shield are structure as a whole.

5. the vehicle as claimed in claim 1 air guide structure of combustion engine, it is characterized in that: described cylinder cap and described first deflector shield are structure as a whole.

6. vehicle as claimed in claim 1 is characterized in that: two light-up plugs are installed on described cylinder cap, and are provided with the air-casing with cooling around described first jack, second jack, import the described wind that travels in this air-casing with the air guide structure of combustion engine.

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