CN1746464B - Engine of motorcycle - Google Patents

Abstract

The invention is to position a centrifugal clutch, a manual clutch and an oil filter such that one side part of an engine becomes compact and to reduce the size of a clutch cover covering these members. The centrifugal clutch 19 is provided in one end part of a crank shaft 11. The main clutch 63 for gear change is provided in the rear side of a vehicle body from the centrifugal clutch 19 and outside the vehicle body. The front part of the main clutch 63 overlaps with the centrifugal clutch 19 in the vehicle width direction. The oil filter 84 is provided in a position forward the main clutch 63 so as to overlap with the centrifugal clutch 19 in the vehicle width direction.

Description

Motorcycle engine

Technical field

The present invention relates to motorcycle engine, wherein oil purifier is arranged on the clutch cover.

Background technique

A kind of motorcycle engine of general type is disclosed in the patent documentation 1, and in the motorcycle engine in being disclosed in patent documentation 1, speed changer is arranged on the back of the bent axle in this vehicle body.Shift of transmission when the driver operates change pedal with pin, speed changer has main shaft that is positioned at the power transmission system upstream and the live axle with a plurality of driving gears, a plurality of driving gears engagements on these a plurality of driving gears and this main shaft.

Manual clutch is installed in the end of main shaft on the vehicle body right side, and main shaft is connected in bent axle through this clutch.When the driver pressed clutch lever, this manual clutch unclamped this powerdriven speed changer, and when driver's loosen the clutch operating stem, this manual clutch engages this powerdriven speed changer.This clutch reaches this vehicle body right side and lives with the clutch cover cap from this crankcase.

This clutch covers on the end that is connected in crankcase on this vehicle body right side.Oil purifier is arranged on the front end of this clutch cover.The oil purifier of the oil that filtration transmits from oil pump has the oil purifier housing that cavity and lid by the clutch cover constitute and is placed on filter core in the housing.

Patent documentation 2 discloses a kind of motorcycle engine of routine, and wherein, centrifugal clutch is installed in the end of bent axle.In patent documentation 2 disclosed motors, this centrifugal clutch is installed in the end of the bent axle on the vehicle body right side.Because this centrifugal clutch unclamps speed changer when low speed rotation, this motor also can keep running when promptly convenient vehicle stopped, and speed changer was not turned back to neutral gear position.In patent documentation 2 disclosed motors, oil pump is arranged on the same side with respect to crankweb along vehicle-body width direction and this centrifugal clutch.This oil pump and this bent axle engagement and by this crank-driven.

Except the pointed prior art document of the prior art documentation ﹠ info of mentioning here, the applicant did not find before application is submitted to and the closely-related prior art document of the present invention.

Patent documentation 1

JP-A-2003-161133 (the 4th to 6 page and Fig. 4)

Patent documentation 2

JP-A-2003-262112 (the 3rd to 5 page and Fig. 3)

Summary of the invention

The problem to be solved in the present invention

The inventor expects, the centrifugal clutch that is disclosed in the patent documentation 2 is provided in the motor in being disclosed in patent documentation 1, so as to make be convenient vehicle when stopping motor can not stopping yet, and need not break away from manual clutch.

But when realizing this structure, this centrifugal clutch, manual clutch and the oil purifier that are connected in this clutch cover all are positioned on the side of this motor, and this part that causes motor compared big significantly with another part.When a side of this motor part was big, the clutch cover that is connected in this part must be big.So, the vibration resonance of the plate portion of clutch cover and motor and cause noise.

Also have, in patent documentation 2 disclosed motors, this centrifugal clutch and oil pump are arranged on the same side at this vehicle-width direction.Therefore, when manual clutch was arranged in this motor as mentioned above, many component must be arranged on the sidepiece of this motor at this centrifugal clutch place, thereby compared with other parts, and it is big that this part of motor becomes.

Propose the present invention to overcome the problems referred to above, therefore, the objective of the invention is to be provided with centrifugal clutch, manual clutch and oil purifier, so that a sidepiece of motor can be compact, with the size of the clutch cover that reduces to cover them.Another object of the present invention provides the oil pump in the motor, makes that a sidepiece of motor can be compact.

The means of dealing with problems

In order to realize this purpose, according to the present invention, a kind of motorcycle engine comprises: the centrifugal clutch that is installed in bent axle one end; Be arranged on the back and the main clutch outside, that be used to shift gears of centrifugal clutch in this vehicle body; And be positioned at this main clutch front portion, along the oil purifier of an overlapping position of the width direction of vehicle and this centrifugal clutch.

According to the motorcycle engine of second aspect present invention, wherein, oil purifier is arranged to be higher than and will be stored in the pasta of the oil of crankcase bottom.

According to the motorcycle engine of third aspect present invention, wherein, this oil purifier is arranged on the side relative with the body side support.

According to the motorcycle engine of fourth aspect present invention, wherein, be used for being connected in the end of this crankcase, and this clutch cover has by filter core and holds the oil purifier housing that cavity and lid form from the clutch cover that a side cover is lived centrifugal clutch.

Motorcycle engine according to fifth aspect present invention, wherein, oil by filter core is fed into oil content and joins passage, oil content is joined passage on the fitting surface of the edge of this oil purifier housing opening, the lid that is formed on this oil purifier housing and this clutch cover, and an end of extending end that should the oil passage is connected in camshaft lubrication oil passage, and the other end that should the oil passage is connected in the crank lubricating passage.

Motorcycle engine according to sixth aspect present invention also comprises: be positioned at oil pump on the relative side with this centrifugal clutch with respect to this crankweb.

Motorcycle engine according to seventh aspect present invention is the motorcycle engine of the claim 6 according to the present invention, wherein, this oil pump has the running shaft with the engagement of this bent axle, and the sprocket wheel that is used for timing chain is installed in this bent axle in the position than more close this crankshaft end of oil pump actuation gear on this bent axle.

Motorcycle engine according to eighth aspect present invention is the motorcycle engine of the claim 7 according to the present invention, and it is the water-cooled engine that has around the cooling water passage of its cylinder.

Motorcycle engine according to ninth aspect present invention is the motorcycle engine of the claim 6 according to the present invention, wherein, be used for being connected in an end of this crankcase from the clutch cover that a side cover is lived this centrifugal clutch, and this clutch cover has by filter core and holds the oil purifier housing that cavity and lid constitute.

Beneficial effect

According to motorcycle engine of the present invention, oil purifier is arranged in the dead band that is formed at this main clutch front and this centrifugal clutch one side.Therefore, according to the present invention, because centrifugal clutch, main clutch and oil purifier can be installed by this way, make that a sidepiece of this motor can be compact, the clutch cover that is covering them can be very little.As a result, though centrifugal clutch and main clutch on a side, can provide the motorcycle engine that produces less noise, this noise is owing to the clutch cover causes.

According to second aspect present invention, when motor did not move, the oil in the oil purifier was because gravity turns back to the bottom of crankcase.Therefore, when renew cartridge more,, oil is not easy to more renew cartridge owing to not flowing out oil purifier.

According to third aspect present invention, when vehicle parking was on side support, oil purifier was positioned at higher relatively position.Because usually when vehicle renew cartridge more during at this state, oil unlikely spills.

According to fourth aspect present invention, the oil purifier housing can be formed by the part of clutch cover.Therefore, form dividually with the clutch cover with the oil purifier housing and to compare, this clutch cover can be compact.

According to fifth aspect present invention, the oil by filter core supplies to oil content and joins passage, and oil content is joined passage and is easy to be formed by groove and this lid of being formed on this clutch cover.

According to sixth aspect present invention, because centrifugal clutch and oil pump must be installed on this bent axle or accept driving force thereby can increase the length of this bent axle from this bent axle, this centrifugal clutch and oil pump can be separately positioned on a side and the opposite side along vehicle-width direction.Therefore, compare with the situation that component all are positioned on the same side, that sidepiece at this centrifugal clutch place can be compact.

According to seventh aspect present invention, timing chain can be pulled down and need not pull down oil pump from crankcase from the sprocket wheel on this bent axle.Therefore, maintenance is easy to pull down timing chain when needing.

According to eighth aspect present invention, the chain line of timing chain separates the width of cooling water passage and form the dead band between the sprocket wheel that is used for this timing chain and this crankweb with cylinder.But according to the present invention, the oil pump actuation gear is positioned at this dead band.Therefore, driving force can be transferred to oil pump and need not to increase the length of this bent axle.

According to ninth aspect present invention, this oil-filter shell body can be formed by the part of this clutch cover, therefore, forms dividually with this clutch cover with this oil purifier housing and to compare, and this clutch cover can be compact.

Description of drawings

Fig. 1 is the side view that has according to the motorcycle of motor of the present invention.

Fig. 2 is the right side view according to motor of the present invention.

Fig. 3 is the right side view of left half crankcase.

Fig. 4 is the left side view of left half crankcase.

Fig. 5 is the left side view of left half crankcase.

Fig. 6 is the right side view of left half crankcase.

Fig. 7 is the left side view of right half crankcase.

Fig. 8 is the right side view of right half crankcase.

Fig. 9 is the perspective view that forms the clutch cover of oil purifier housing.

Figure 10 is the sectional view along the X-X line intercepting of Fig. 2.

Figure 11 is the sectional view along the XI-XI line intercepting of Fig. 3.

Figure 12 is the sectional view along the XII-XII line intercepting of Fig. 5.

Figure 13 is the sectional view that cylinder side oil passage is shown.

Figure 14 illustrates the sectional view of oil being supplied with the oily passage of the oily passage in the main shaft.

Figure 15 illustrates the sectional view of oil being supplied with the oily passage of the oily passage in the live axle.

Figure 16 is the sectional view that is illustrated in the grease chamber in the right auxiliary crank chamber.

Figure 17 is the sectional view that the steering force transfer unit of speed changer is shown.

Figure 18 is the perspective view that oily passage general construction is shown.

Embodiment

Below with reference to the embodiment of Fig. 1 to Figure 18 detailed description according to motorcycle engine of the present invention.

Fig. 1 is the side view that has according to the motorcycle of motor of the present invention, and Fig. 2 is the right side view according to motor of the present invention, and Fig. 3 is the right side view of left half crankcase, and wherein bent axle and cylinder block illustrate with the cross section.Fig. 4 and Fig. 5 are the left side views of left half crankcase.Fig. 4 illustrates the state that component have been assemblied in this left side half crankcase, and Fig. 5 illustrates the state that has only left half crankcase.

Fig. 6 is the right side view of left half crankcase, Fig. 7 is the left side view of right half crankcase, Fig. 8 is the right side view of right half crankcase, Fig. 9 is that part of perspective view that forms the clutch cover of oil purifier housing, Figure 10 is the sectional view along the X-X line intercepting of Fig. 2, Figure 11 is the sectional view along the XI-XI line intercepting of Fig. 3, Figure 12 is the sectional view along the XII-XII line intercepting of Fig. 5, Figure 13 is the sectional view that cylinder side oil passage is shown, Figure 14 is along the sectional view of the XIV-XIV line intercepting of Fig. 6, and the oily passage of oil being supplied with the oily passage in the main shaft is shown.Figure 15 is along the sectional view of the XV-XV line intercepting of Fig. 7, and the oily passage of oil being supplied with the oily passage in the live axle is shown.Figure 16 is along the sectional view of the XVI-XVI line intercepting of Fig. 8, is illustrated in the grease chamber in the right auxiliary crank chamber.Figure 17 is the sectional view along the XVII-XVII line intercepting of Fig. 8, and the steering force transfer unit of speed changer is shown.Figure 18 is the general construction that oily passage is shown, and wherein (a) is the view of seeing from the left back upside of vehicle body, (b) is the view of seeing from the right back upside of vehicle body.The place ahead of vehicle body is represented by arrow F in Figure 18.

In these accompanying drawings, mark 1 is according to motorcycle of the present invention.The 2nd, the front-wheel of motorcycle 1, the 3rd, front fork, the 4th, operation handle, the 5th, stand, the 6th, motor, the 7th, postbrachium, the 8th, side support, the 9th, trailing wheel.Side support 8 is connected in the lower end of the back arm support 10 on the vehicle body left side.

Motor 6 is water-cooled, four circulation single-cylinder engines, as shown in Figures 2 and 3, has the crankcase 12 that is used for supporting bent axle 11 in rotatable mode, be connected in the cylinder block 13 of these crankcase 12 upper ends in the vehicle body front side, its axis upwards turns forward, be connected in the cylinder head 14 of these cylinder block 13 upper ends, be connected in housing 15 of this cylinder head 14 or the like.

As shown in figure 10, this bent axle 11 is made of a pair of left and right sides crankweb 16 and 16, the crankpin 17 that is connected in crankweb 16.Flywheel type permanent-magnet generator 18 is installed in the end of the bent axle 11 on the vehicle body left side, and the centrifugal clutch 19 that describes below is installed in the end of the bent axle 11 on this vehicle body right side.As shown in Figure 2, piston 21 is connected in crankpin 17 by connecting rod 20.

Have the valve mechanism 25 that camshaft 22 is used for driving suction valve 23 and outlet valve 24 and be arranged on cylinder head 14.Outlet pipe 26 is connected in the front side of cylinder head 14, and Carburetor 28 is connected in the rear side of cylinder head 14 via suction tude 27.Air-strainer 29 is connected in the upstream side of this Carburetor 28, as shown in Figure 3.

As shown in figure 10, crankcase 12 can laterally be divided in half one (hereinafter referred to as a left side half crankcase 31) in vehicle body left side with half one on vehicle body right side (below become right half crankcase 32) along vehicle body, it has bearing 33 and 34, is used for supporting this bent axle 11 and the speed changer 35 that will be described below being installed in rotatable mode.

Reference character is to be labeled as 37 fixing bolt among a plurality of external stability bolts of 36 and Figure 11 to interconnect among a left side half crankcase 31 and right half crankcase, 32 usefulness Fig. 4.

A left side half crankcase 31 and right half crankcase 32 have the vertical wall that forms 43 and 44 as shown in figure 10 respectively, be used to support the live axle 42 of bent axle 11 and main shaft 41 and speed changer 35, and have the dividing plate 45,46 that is integrally formed therewith and extends along the Lower Half of crankweb 16 as shown in Figure 3 respectively.

The vertical wall 43 of a left side half crankcase 31 and right half crankcase 32 and 44 forms thereon and vertically and longitudinal extension.Main shaft 41 is supported in rotatable mode via bearing 47 and 48 by vertical wall 43 and 44, and live axle 42 is supported in rotatable mode via bearing 49 and 50 by vertical wall 43 and 44.

Dividing plate 45 and 46 is seen the semicircular in shape that has to lower recess from the side, as Fig. 3, Fig. 6 and shown in Figure 7.When a left side half crankcase 31 and right half crankcase 32 linked together, the dividing plate 45 of left half crankcase 31 had the end face that closely contacts mutually with the dividing plate 46 of right half crankcase 32. Groove 51 and 52 is respectively formed in the end face of this dividing plate 45 and 46.This groove 51 and 52 extends along the whole length of this dividing plate 45 and 46, and forms closed hole when this dividing plate 45 and 46 interconnects.This hole is hereinafter referred to as main oil gallery 53.

As shown in Figure 6, the bottom that is arranged on this crankcase 12 is seen from the side for the oil transportation channel 55 of its fuel feeding from the oil pump 54 (seeing Fig. 2, Fig. 4 and Figure 12) that describes below and is being connected in this main oil gallery 53 near the position of its underpart (along it vertically roughly in the centre of dividing plate 45 and 46).

Dividing plate 45 and 46 has the standing part 56 and 57 that is integrally formed therewith respectively, and (see figure 3) is used in position that they and cylinder-bore axis C intersect they are linked together.This standing part 56 and 57 along vehicle-width direction respectively from a left side outer end of half crankcase 31 and right half crankcase 32 extend to the inner end.As shown in figure 11, the standing part 56 of left half crankcase 31 has the through hole 56a that is used to hold fixing bolt 37, and the standing part 57 of right half crankcase 32 has the tapped hole 57a that is used to hold fixing bolt 37 with being threaded.

As shown in figure 10, the flywheel type permanent-magnet generator lid 61 that is used to cover flywheel type permanent-magnet generator 18 is connected in the end of left half crankcase 31 in the vehicle body left side.The end of the right side half crankcase 32 on the vehicle body right side, horizontal wall 62 is extended to the right from the periphery edge of vertical wall 44.The clutch cover 64 that is used to cover centrifugal clutch 19 and the following main clutch that will describe 63 is connected in the horizontal wall 62 on the vehicle body right side.

In crankcase 12, main crank chamber 65 is limited between the vertical wall 44 of the vertical wall 43 of left half crankcase 31 and right half crankcase 32, as shown in figure 10, and left auxiliary crank chamber 66 be limited between the vertical wall 43 of left half crankcase 31 and the flywheel type permanent-magnet generator lid 61.Right auxiliary crank chamber 67 is limited between the vertical wall 44 and horizontal wall 62 and clutch cover 64 of right half crankcase 32.The inside of the inside of main crank chamber 65 and auxiliary crank chamber, the left and right sides 66 and 67 is interconnected by a plurality of intercommunicating pores 68 (seeing Fig. 3 to Fig. 8) that form by vertical wall 43 and 44.

Be installed in centrifugal clutch 19 on the bent axle 11 have at the bottom of as shown in figure 10 the band that supports in rotatable mode by bent axle 11 cylindrical barrel part 71 and can be in this cylindrical piece 71 with the centrifugal top 72 (seeing Figure 16) of these bent axle 11 rotations.When the rotational speed of bent axle 11 surpassed predetermined value, power was transferred to this cylindrical piece 71 from bent axle 11 via this centrifugal top 72.

Its opening towards vehicle body left side orientation of these cylindrical piece 71 usefulness is connected in bent axle 11, and has on the vehicle body right side, is arranged to the cylindrical output shaft 74 coaxial with bent axle 11 in its end.This cylindrical output shaft 74 has reduction pinion teeth 75, and via this reduction pinion teeth 75 and main clutch 63 engagements, this will describe after a while.

In this embodiment, centrifugal clutch 19 is positioned near the outside of vertical wall 44 of right half crankcase 32, as Figure 10 and shown in Figure 16.

The bottom of this centrifugal clutch 19 is from be placed on grease chamber 76, and grease chamber 76 is formed on the bottom of this auxiliary crank chamber, right side 67 on the vehicle body front side, as Fig. 8 and shown in Figure 16.The sidewall of grease chamber 76 is formed by the vertical wall 64a (seeing Figure 16) of the vertical wall 44 of the right side half crankcase 32 and the clutch cover 64 relative with this vertical wall 44.The antetheca of this grease chamber 76 is formed with the antetheca 64b (see figure 10) that is connected in the clutch cover 64 of this horizontal wall 62 by the horizontal wall 62 of the right side half crankcase 32.The rear wall of this grease chamber 76 by at this vehicle body longitudinal middle part, the upwardly extending partition wall 77 in bottom of the right auxiliary crank chamber 67 of half crankcase 32 and the partition wall 64c (seeing Figure 16) that is connected in the clutch cover 64 of this partition wall 77 form from the right side, as Fig. 8 and shown in Figure 16.

The oil that has flow to dividing plate 45 and 46 flows to grease chamber 76 by intercommunicating pore 68a (see figure 8) and is kept at wherein when the engine operation.Pasta in this grease chamber 76 is lower than centrifugal clutch 19 when motor is not worked and dallied, shown in the double dot dash line L1 among Figure 16, and pasta raises and is not had by oil immersion up to the bottom of this cylindrical piece 71 when motor moves, shown in the double dot dash line L2 among Figure 16.

The sense of rotation of this cylindrical piece 71 (bent axle 11) sees it is clockwise direction from the right side of this vehicle body.Therefore, the oil in grease chamber 76 is splashed to the rear portion of the grease chamber 76 in the right auxiliary crank chamber 67 by the rotational circle barrier part 71 of centrifugal clutch 19.The part of the oil of sputter goes up to lubricate them attached to component this auxiliary crank chamber 67, right side (the hereinafter steering force transfer unit 78 of Miao Shuing) backward from grease chamber 76.The oil that is splashed to the rear portion of grease chamber 76 finally turns back to main crank chamber 65 by the intercommunicating pore 68b that is positioned at this partition wall 77 and 64c back from this auxiliary crank chamber, right side 67.

Main clutch 63 be and the gear shift operation of speed changer 35 synchronously, the multiplate clutch that between coupled condition and disengaged position, switches, it is being described after a while, and is installed in the end of the main shaft 41 of the speed changer 35 on the vehicle body right side, as shown in figure 10.This main clutch 63 have can with the input component 82 of deceleration gearwheel 81 rotations of reduction pinion teeth 75 engagement and can be with the output member (not shown) of main shaft 41 rotations.When the push rod 83 that inserts main shaft 41 along its axis moved to Figure 10 right side, main clutch 61 was transformed into disengaged position, was transformed into coupled condition when push rod 83 moves to Figure 10 left side.

In this embodiment, main clutch 63 is arranged on the back and the outside of this centrifugal clutch 19 in the vehicle body, and its front portion is overlapping in vehicle-body width direction and centrifugal clutch 19, as Fig. 2 and shown in Figure 10.Oil purifier 84 is arranged on these main clutch 63 front portions, along vehicle-body width direction and this centrifugal clutch 19 position overlapped.That is to say that this main clutch 63 and this oil purifier 84 are arranged on the same side with respect to the crankweb 16 of this bent axle 11 with centrifugal clutch 19 along vehicle-width direction.

Oil purifier 84 has: by being formed on these clutch cover 64 front ends and being opened on the cavity 85 on vehicle body right side and being used to close the housing 87 that the lid 86 of these cavity 85 openings constitutes; And be placed on cylindrical filter core 88 in this housing 87, as shown in figure 10.This oil purifier 84 is arranged to be higher than the oil pump shown in Figure 2 54 that will describe after a while, and is higher than the pasta in this crankcase 12 of representing with double dot dash line in Fig. 4.

In this embodiment, oil purifier 84 has such structure, and promptly when the oil that supplies to annular grease chamber 91 (see figure 10)s between the internal surface of filter core 88 and this cavity 85 arrived its inboard by this filter core 88, the foreign matter in the oil was eliminated.

This annular grease chamber 91 is connected in the front end of this main oil gallery 53 by oil purifier inlet channel 92, and oil purifier inlet channel 92 is along the front end horizontal expansion of the front end and the clutch cover 64 of the horizontal wall 62 of right half crankcase 32, as Figure 10, Figure 12 and shown in Figure 180.Be connected in oil content and join passage 94 (see figure 9)s by being formed on communication passage 93 in the lid 86 in the grease chamber of filter core 88 inboards, this oil content is joined passage 94 and is made of the groove in the fitting surface 64a (see figure 9) that is formed on this lid 86 and clutch cover 64, as shown in figure 10.Therefore, the oil that has flowed out oil purifier 84 is joined passage 94 by oil content and is supplied to crank lubricating passage 95 (seeing Figure 10 and Figure 18) and camshaft lubrication oil passage 96 (seeing Figure 13 and Figure 18), and this will describe after a while.

Oil content is joined that passage 94 is formed in the fitting surface of this clutch cover 64 and lid 86 and is extended along the edge (groove 85) of these oil purifier housing 87 openings, when it is convex circular arc when side shown in Figure 9 is seen.This crank lubricating passage 95 is connected in the end that this oil content is joined passage 94 on the vehicle body rear side, and camshaft lubrication oil passage 96 is connected in the end that this oil content is joined passage 94 on the vehicle body front side.

This crank lubricating passage 95 has to be joined this oil content communication passage 98 that passage 94 is communicated with bent axle attachment hole 97 in the clutch cover 64, the oily passage 99 that forms along these bent axle 11 axis, is used for oil is introduced oily path 10 0 of connecting rod tip 20a or the like from this oil passage 99, as Figure 10 and shown in Figure 180.

This camshaft lubrication oil passage 96 has along the oily path 10 1 of the front end horizontal expansion of the horizontal wall 62 of the front end of clutch cover 64 and right half crankcase 32, on this camshaft 22, be connected in the oily path 10 4 of this oil path 10 1 by cylinder bolt patchhole 102, with oily path 10 3 on the cylinder head 14 or the like, as Figure 13 and shown in Figure 180.

This speed changer 35 is made of following parts: be positioned at this bent axle 11 back, the main shaft 41 of the parallel axes of its axis and this bent axle 11 and live axle 42, be installed in this a plurality of driving gears (111 to 118) on 41 and 42, with two can axially movable driving gear (113 and 116) two selector forks 119 and 120 (the seeing Fig. 3 and Fig. 8) of engagement, be used for laterally moving the cylindrical piece 121 (seeing Figure 17) of this selector fork 119 and 120 along vehicle body, be used for by the steering force transfer unit 78 (see Fig. 8 and Figure 17) of steering force, as shown in figure 10 to rotate this cylindrical piece 121 from the change pedal (not shown).

The end of the live axle 42 on the vehicle body left side reaches the outside by the vertical wall 43 of a left side half crankcase 31, as shown in figure 10.Rear wheel drive chain 122 connections sprocket wheel 123 thereon is connected in the external part of this live axle 42.

In steering force transfer unit 78, the rotation that extends through the selector fork axle 131 of these crankcase 12 bottoms along vehicle-width direction passes to gearshift cylindrical piece 121 via first gear level 132 and second gear level 133, as Fig. 8 and shown in Figure 17.This selector fork axle 131 is supported in rotatable mode by the vertical wall 43 and 44 of a left side half crankcase 31 and right half crankcase 32, as Figure 14 and shown in Figure 17, and the change pedal (not shown) is connected in the end that reaches the selector fork axle 131 in vehicle body left side from the vertical wall 43 of left crankcase 12.

Cam mechanism 135 with ball 134 is arranged on the middle part of selector fork axle 131, as shown in figure 14.This cam mechanism 135 has removable plate 136, and this plate 136 is along the axial direction to-and-fro motion of this selector fork axle 131 when selector fork axle 131 rotates.This removable plate 136 is connected in the end of interlocking lever 137.

Be used for will this removable plate 136 transmission of movement support by the supporting element 138 that is connected in left half crankcase 31 to this interlocking lever 137 of the push rod on the opposite side 83, and be connected in removable plate 136 and push rod 83.That is, when operation change pedal and selector fork axle 131 rotated, push rod 83 was pressed to the vehicle body right side by cam mechanism 135 and interlocking lever 137, so that this main clutch 63 is transformed into disengaged position from coupled condition.When gearshift changes that operation is finished and steering force when discharging, main clutch 63 turns back to coupled condition by the elastic force of the return spring (not shown) in this clutch.

35 driving gear 111 to 118 of speed changer, selector fork 119 and 120 and cylindrical piece 121 all be installed in the main crank chamber 65.As Fig. 3 and shown in Figure 10, these parts are positioned at the top and the back of crankweb 16 obliquely, and the oil of collecting on the dividing plate 45 and 46 of crankcase 12 is sputtered on these parts so that they are lubricated by crankweb 16.The oil of collecting on the dividing plate 45 and 46 is the oil that the lubricated part of the connecting rod tip 20a from this bent axle 11 and main crank chamber 65 flows down or drips.

As Fig. 8 and shown in Figure 17, the steering force transfer unit 78 of speed changer 35 is arranged in the back of right auxiliary crank chamber 67 and centrifugal clutch 19.The cylindrical piece 71 of this steering force transfer unit 78 and this centrifugal clutch 19 vertically aligns (being arranged on substantially with on the part along vehicle-body width direction) and by by the oil lubrication of cylindrical piece 71 sputters in this grease chamber 76 along vehicle body.

Being used to the oil pump 54 of main oil gallery 53 fuel feeding is trochoid pumps, and is connected in the lower end of the vertical wall 43 of left half crankcase 31, and its spin axis 141 is parallel to vehicle-width direction, as shown in figure 12.In this embodiment, oil pump 54 is arranged on and the identical substantially position of bearing at end 33 that is used for being supported on the bent axle 11 on the vehicle body left side along vehicle-width direction.That is to say that this oil pump 54 is along vehicle-width direction, be positioned on the side relative with this centrifugal clutch 19, as shown in figure 12 with respect to crankweb 16.

Be connected in the end of the running shaft 141 on the vehicle body left side by the driven gear 142 of plastics manufacturing.Oil pump actuation gear 143 engagements on this driven gear 142 and the bent axle 11.That is, running shaft 141 and bent axle 11 engagements.

The end of this running shaft 141 on the vehicle body right side is assemblied in the axis hole 144 of vertical wall 43.This axis hole 144 forms and makes its upper half part extend through this vertical wall 43 along vehicle-width direction.This axis hole 144 has out the opening in this main crank chamber 65 in the end with oil pump 54 opposite sides.This opening is 145 at the label that Fig. 6 and Figure 12 give.

In Figure 12, what give mark 146 on the left side (outside) of this driven gear 142 is a plate, is used to prevent that the oil that is stored in crankcase 12 bottoms from being stirred by driven gear 142.This plate 146 sees to have shape from the side, so that it can cover the front portion and the bottom of this driven gear 142 from the side, and is connected in vertical wall 43 by fixing bolt 147, as shown in Figure 4.This plate 146 that is connected in vertical wall 43 as mentioned above defines pump installing space S around this driven gear 142 with vertical wall 43.That is, this pump installing space S is separated by this plate 146 with the oil storage part of these crankcase 12 bottoms, and oil is difficult to enter this pump installing space S.The pasta that is stored in the oil of these crankcase 12 bottoms is represented with double dot dash line L3 in Fig. 4.

As shown in figure 12, the upper end of this plate 146 is relative at interval with specific distance with timing chain 148 lower ends.The outside that this timing chain 148 is connected in the oil pump actuation gear 143 in vehicle body is installed on the sprocket wheel 149 on the bent axle 11 and on the sprocket wheel 150 (seeing Figure 13) on the camshaft 22.Distance between this timing chain lower end 148 and the plate 146 is arranged to make this timing chain 148 not break away from from sprocket wheel 149 downwards.That is, this plate 16 has and prevents that oil from entering around the effect of the pump installing space S of this driven gear 142 with when the maintenance and prevent that this timing chain 148 breaks away from the effect of the sprocket wheel 149 on these bent axles 11 etc.The chain line of this timing chain 148 is from extending upward along cylinder at the sprocket wheel 149 that is installed in this timing chain on the bent axle 11 than oil pump actuation gear 143 more close bent axle 11 end positions.This chain line separates around the width of the cooling water passage 6a of this cylinder formation, as shown in figure 13 with cylinder.

This oil pump 54 has and is connected in suction port 54a (seeing Figure 12) that is expressed as 151 suction passage in Fig. 5 and the oil transportation mouth 54b that is connected in oil transportation channel 55, and this oil transportation channel 55 is positioned at the front of this suction passage 151.

This suction passage 151 is vertically extended and is connected the suction port 54a of this oil pump 54 and at the accumulator 152 of these crankcase 12 bottoms, as shown in figure 12 along vertical wall 43.Filter 153 is arranged on the upstream of this suction passage 151.

Accumulator 152 by in conjunction with as Fig. 3 and shown in Figure 6 be formed in left half crankcase 31 and towards the cavity 153 of the opening on vehicle body right side and as shown in Figure 7 be formed in right half crankcase 32 and the cavity 154 of opening on the left of the vehicle body forms.Be used for flowing to the oil-in 155 that the oil of these crankcase 12 bottoms is introduced accumulator 152 downwards, the lower end of the wall of this accumulator 152 by the vehicle body rear side forms.

Oil transportation channel 55 extends in vertical wall 43 and connects the oil transportation mouth 54b of oil pump 54 and along the middle part of the main oil gallery 53 of its y direction, as shown in figure 12 along vehicle-width direction.

The end of this main oil gallery on this vehicle rear-side, be formed with and be used for the oil introducing (is seen Figure 10 along this main shaft 41, Figure 14 and Figure 18) the oily passage 161 that extends of axis main shaft oil passage 162 (seeing Fig. 6, Figure 14 and Figure 18) and be used for oil is introduced along the driving shafting oil passage 164 (seeing Figure 15 and Figure 18) of the oily passage 163 of the axis extension of this live axle 42 (seeing Figure 10, Figure 15 and Figure 18).

This main shaft oil passage 162 extends to vertical wall 43 left from main oil gallery 53 in half crankcase 31 of a left side, then in vertical wall 43 sideling upwards and extend rearward to main shaft seat groove 165, as Fig. 6, Figure 14 and shown in Figure 180.By oily passage 162 supply to the oil lubrication main shaft of the oily passage 161 in the main shaft 41 bearing 47 and 48, be installed in driving gear 111 to 114 on this main shaft 41 and the slide part of this push rod 83 grades.

This driving shafting oil passage 164 extends to vertical wall 44 to the right from main oil gallery 53 in half crankcase 32 of the right side, make progress sideling then and extend rearward to live axle groove 166 is installed in vertical wall 44, as Fig. 7, Figure 15 and shown in Figure 180.By oily passage 164 supply to the oil lubrication live axle 42 of the oily passage 163 in the live axle 42 bearing 49 and 50, be installed in driving gear 115 to 118 on this live axle 42 etc.

In the motorcycle engine 6 of constructing as mentioned above, this main clutch 63 is arranged on the back and the outside of centrifugal clutch 19, this centrifugal clutch 19 is installed on the end of the bent axle 11 in the vehicle body, its front portion is overlapping along vehicle-width direction and this centrifugal clutch 19, and oil purifier 84 is arranged in these main clutch 63 front portions, along vehicle-body width direction and this centrifugal clutch 19 position overlapped.Therefore, in this motor 6, oil purifier 84 is arranged in the dead band that is formed on these main clutch 63 front portions and these centrifugal clutch 19 1 sides.

Therefore, in according to present embodiment motorcycle engine 6, this centrifugal clutch 19, main clutch 63 and oil purifier 84 can be installed by this way, make the part of this motor 6 on this vehicle body right side can be compact.

In this embodiment, this oil purifier 84 is arranged to be higher than the pasta (representing with double dot dash line L3) of the oil that is stored in these crankcase 12 bottoms in Fig. 4, the oil when not moving with convenient motor 6 in this oil purifier 84 is because gravity turns back to the bottom of this crankcase 12.Therefore, when lid 86 when this clutch cover 64 is pulled down with renew cartridge 88 more, oil does not flow out this filter core and holds cavity 85.

In the motorcycle engine 6 according to this embodiment, this oil purifier 84 is provided with the right side of vehicle body, and this side is a side relative with side support 8.Therefore, when this vehicle parking was on this side support 8, this oil purifier 84 was positioned at higher position.Therefore, when in this case more during renew cartridge 88, oil seldom can spill.

In the motorcycle engine 6 according to this embodiment, this oil purifier housing 87 is formed by the part of clutch cover 64.Therefore, do not need special part as oil purifier housing 87.

In motorcycle engine 6 according to this embodiment, the filter core 88 of oil by oil purifier 84 is fed into oil content and joins passage 94, and this oil content is joined the groove that passage 94 is formed on by the edge along the opening of this cavity 85 on the fitting surface of this clutch cover 64 and lid 86 and formed.Therefore, joining passage 94 along the oil content of vehicle body longitudinal extension is easy to form.

In motorcycle engine 6 according to this embodiment, this main clutch 63 and oil purifier 84 crankweb 16 with respect to this bent axle 11 on vehicle-body width direction is arranged on the same side with this centrifugal clutch 19, and oil pump 54 is positioned on the side relative with this centrifugal clutch 19.Just, according to this motor 6, because clutch 19 and oil pump 54 must be installed on the bent axle or from this bent axle and accept driving force thereby the length of bent axle is increased, centrifugal clutch 19 and oil pump 54 can be arranged on the vehicle-body width direction on a side and the opposite side.Therefore, this part of this motor 6 on these centrifugal clutch 19 these sides, the situation that is arranged on the same side with these component is compared, can be compact.

In this embodiment, the running shaft 54 of oil pump 54 and bent axle 11 engagements, and the sprocket wheel 149 of timing chain is being installed on this bent axle 11 on the position than 143 more close these bent axle 11 ends of the oil pump actuation gear on this bent axle 11.Therefore, according to this embodiment's motorcycle engine 6, this timing chain 148 can be pulled down and need not to pull down oil pump 54 from this crankcase 12 from sprocket wheel 149.

Are water-cooled engine and have cooling water passage 6a in motorcycle engine 6 around cylinder according to this embodiment.Therefore, the chain line of this timing chain 148 and this cylinder separate the width of this passage 6a, and the dead band is formed between the sprocket wheel and this crankweb that is used for this timing chain.But according to the present invention, as shown in figure 12, oil pump actuation gear 143 is arranged in this dead band.Therefore, driving force can be transferred to this oil pump and need not to increase the length of this bent axle.

Claims (9)

1. a motorcycle engine comprises: the centrifugal clutch that is installed in bent axle one end; Be arranged on the back and the main clutch outside, that be used to shift gears of centrifugal clutch in this vehicle body; And be positioned at this main clutch front portion, on the width direction of vehicle with the oil purifier of centrifugal clutch position overlapped.

2. according to the motorcycle engine of claim 1, wherein, this oil purifier is arranged to be higher than and will be stored in the pasta of the oil of crankcase bottom.

3. according to the motorcycle engine of claim 1, wherein, this oil purifier is arranged on the side relative with the body side support.

4. according to the motorcycle engine of claim 1, wherein, be used for being connected to an end of this crankcase, and this clutch cover has by filter core and holds the oil purifier housing that cavity and lid form from the clutch cover that a side cover is lived centrifugal clutch.

5. according to the motorcycle engine of claim 4, wherein, oil content is joined passage and is formed on the fitting surface of the lid of this oil purifier housing and this clutch cover along the edge of this oil purifier housing opening, oil by described filter core is fed into this oil content and joins passage, and an end of extending end that should the oil passage is connected in camshaft lubrication oil passage, and the other end that should the oil passage is connected in the crank lubricating passage.

6. according to the motorcycle engine of claim 1, wherein, described main clutch and oil purifier are arranged on the same side with respect to crankweb at the width direction and the centrifugal clutch of this vehicle, and this motorcycle engine also comprise with respect to crankweb be positioned at the centrifugal clutch opposite side on oil pump.

7. according to the motorcycle engine of claim 6, wherein, this oil pump has the running shaft with this bent axle engagement, and the sprocket wheel that is used for timing chain is installed in this bent axle in the position than more close this crankshaft end of oil pump actuation gear on this bent axle.

8. according to the motorcycle engine of claim 7, this motor is a water-cooled engine, and it has the cooling water passage around its cylinder.

9. according to the motorcycle engine of claim 6, wherein, be used for being connected in an end of this crankcase, and this clutch cover has by filter core and holds the oil purifier housing that cavity and lid constitute from the clutch cover that a side cover is lived this centrifugal clutch.

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