CN1987148A

CN1987148A - Gear speed reducer

Info

Publication number: CN1987148A
Application number: CN 200610168557
Authority: CN
Inventors: 泷口亲司; 小野丰
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2005-12-22
Filing date: 2006-12-19
Publication date: 2007-06-27
Anticipated expiration: 2026-12-19
Also published as: JP2007170569A; JP4879579B2; CN100552260C

Abstract

The topic of the invention is that: in the gear retarder provided between the driving axle with parallel axes and the dead axle, avoiding increasing of the length perpendicular to the axial direction of the driving axle and the dead axle, avoiding increasing of the cost and the weight, and capable of setting to large speed reducing ratio and simplifying structure. The settle project is that: the gear retarder is composed of a first reduction driving gear (87) fixed on the driving axle (54) rotating around axes; a first reduction dead gear (88) meshing to the first reduction driving gear (87), on the position of separating with the driving axle (54) supported relative reelingly on the dead axle (83) rotating around the axes paralleling to the driving axle (54); a second reduction driving gear (89) integrating with the first reduction dead gear (88); a second reduction dead gear (90) meshing to the second reduction driving gear (89), supported relative reelingly on the driving axle (54); a third reduction driving gear (91) integrating with the second reduction dead gear (90); a third reduction dead gear (92) meshing to the third reduction driving gear (91) and fixed on the dead axle (83).

Description

Gear reducer

Technical field

The present invention relates to be arranged on the gear reducer between live axle and the driven shaft.

Background technique

For example, in patent documentation 1 and patent documentation 2, known in two-wheeled motor vehicle with the output of the V-belt formula speed changer of motor cvt output, after utilizing the gear reducer deceleration of three grades of decelerations, pass to the structure of trailing wheel, the structure that discloses in patent documentation 1 constitutes gear reducer in such a way, promptly, between as the live axle of the output shaft of V-belt formula speed changer and driven shaft as the axletree of trailing wheel, configuration has the jack shaft of the axis parallel with live axle and driven shaft, carries out one-level and slow down between live axle and jack shaft, between jack shaft and driven shaft, carry out double reduction.In addition, in the structure that patent documentation 2 discloses, constitute gear reducer in such a way, promptly, in the side that can center on same axis drive shaft rotating and driven shaft, configuration has the jack shaft of the axis parallel with live axle and driven shaft, between live axle and jack shaft, carry out one-level and slow down, between jack shaft and driven shaft, carry out double reduction.

[patent documentation 1] special fair 7-115596 communique

[patent documentation 2] special fair 4-11429 communique

Yet, when setting the reduction speed ratio between live axle and the driven shaft bigger, in the gear reducer that in above-mentioned patent documentation 1, is disclosed, be necessary to strengthen axle base, set the external diameter of actuation gear bigger, can cause the increase of cost and weight, simultaneously, with the direction of the axis normal of live axle and driven shaft on the length of gear reducer also become big.

In addition, in the gear reducer that patent documentation 2 discloses, although the length of the gear reducer on the direction of the axis normal of formation and live axle and driven shaft compactly, but, be difficult to set the reduction speed ratio between live axle and the driven shaft bigger, and, can support the structure that driven shaft uses with the relative rotation with live axle and become complicated.

The present invention In view of the foregoing makes, its objective is provides a kind of gear reducer simple in structure, described gear reducer can avoid perpendicular to the increase of the length on the direction of the axis of live axle and driven shaft, avoid the increase of cost and weight, simultaneously, can set reduction speed ratio bigger.

Summary of the invention

In order to achieve the above object, invention according to scheme 1 is characterized in that, in the gear reducer of being located between live axle and the driven shaft, be equipped with: one-level reduction drive gear, described one-level reduction drive gear are fixed on can be on the aforementioned live axle of axis rotation; One-level deceleration driven gear, described one-level deceleration driven gear with position that aforementioned live axle is isolated on, can be bearing in the relative rotation can be on the aforementioned driven shaft of the axis rotation parallel with this live axle, simultaneously, can be rotated to support on the driven shaft in mode with aforementioned reduction drive gear engagement; The double reduction actuation gear, described double reduction actuation gear and one-level deceleration driven gear form one; The double reduction driven gear, described double reduction driven gear can be bearing on the aforementioned live axle with the relative rotation, is engaged on the double reduction actuation gear; Three grades of reduction drive gear, described three grades of reduction drive gear and double reduction driven gear form one; Three grades of deceleration driven gears, described three grades of deceleration driven gears are fixed on the aforementioned driven shaft, are engaged on three grades of reduction drive gear.

In addition, scheme 2 described inventions, it is characterized in that, on the basis of the structure of scheme 1 described invention, aforementioned live axle and aforementioned driven shaft constitute a part of carrying the power unit on vehicle, along the configuration of the fore-and-aft direction devices spaced apart of vehicle ground, to the plane of the axis normal of aforementioned live axle on projection drawing on, aforementioned driven shaft is configured in the centrifugal clutch that is installed on this live axle.

Scheme 3 described inventions, it is characterized in that, on the basis of scheme 1 described structure, aforementioned live axle and aforementioned driven shaft have V-belt formula speed changer, and formation is carried the part of the power unit on vehicle, along the configuration of the fore-and-aft direction devices spaced apart of vehicle ground, to the plane of the axis normal of aforementioned live axle on projection drawing in, aforementioned driven shaft is configured in a part that constitutes aforementioned V-belt formula speed changer and is installed in the driven pulley on the aforementioned live axle.

Scheme 4 described inventions, it is characterized in that, in scheme 1～3 on the basis of the structure of any one described invention, will set for all identical by the reduction speed ratio that one-level reduction drive gear and one-level deceleration driven gear, double reduction actuation gear and double reduction driven gear and three grades of reduction drive gear and three grades of deceleration driven gears are produced.

Scheme 5 described inventions, it is characterized in that, in scheme 1～4 on the basis of the structure of any one described invention, in aforementioned one-level reduction drive gear, the both sides of the axial direction of double reduction driven gear and three grades of reduction drive gear, but aforementioned live axle via first and second bearing free rotary ground supporting on the crankcase of motor, at aforementioned one-level deceleration driven gear, one side of the axial direction of double reduction actuation gear and three grades of deceleration driven gears, aforementioned driven shaft is on the direction of the axis of this driven shaft, but via be configured in aforementioned clutch shaft bearing roughly the 3rd bearing free rotary ground supporting at same position place on aforementioned crankcase, at aforementioned one-level deceleration driven gear, the opposite side of the axial direction of double reduction actuation gear and three grades of deceleration driven gears, aforementioned driven shaft is on the direction of the axis of this driven shaft, via being configured in and aforementioned second bearing the 4th bearing at same position place roughly, but free rotary ground supporting is on aforementioned crankcase.

And then, scheme 6 described inventions, it is characterized in that, on the basis of the structure of scheme 1～5 described invention, form the aforementioned one-level deceleration driven gear and the aforementioned double reduction actuation gear of one, but via the first metal bearing free rotary ground supporting cylindraceous on aforementioned driven shaft, form aforementioned double reduction driven gear and aforementioned three grades of reduction drive gear of one, but via the second metal bearing free rotary ground supporting cylindraceous on aforementioned live axle, on first and second metal bearing, along radial direction oilhole is set with extending respectively, the inner of described oilhole is communicated with oily path on being arranged on aforementioned driven shaft and aforementioned live axle coaxially, simultaneously, its outer end is in peripheral openings.

In addition, second 54 of embodiment embodiment's jack shaft 83 is corresponding to driven shaft of the present invention corresponding to live axle of the present invention, and embodiment's ball bearing 55,56,84,85 corresponds respectively to first～the 4th bearing of the present invention.

According to scheme 1 described invention, be input to the power of live axle, be installed in the one-level reduction drive gear on the live axle, double reduction driven gear and three grades of reduction drive gear and be installed in one-level deceleration driven gear on the driven shaft, double reduction actuation gear and three grades of deceleration driven gears slow down by three grades, be delivered to driven shaft, can shorten axle base, simultaneously, can set the external diameter of each gear smaller, simultaneously, can obtain big reduction speed ratio, can shorten in length, avoid the increase of cost and weight perpendicular to the gear reducer on the direction of the axis of live axle and driven shaft.And live axle and driven shaft rotatably are configured on the position of mutual isolation, and it is complicated that the structure of gear reducer can not become.

According to scheme 2 described inventions, to the plane of the axis normal of live axle on the projection drawing of projection, live axle and driven shaft are configured in the centrifugal clutch, be easy to guarantee the configuration space of gear reducer, simultaneously, can be with the power unit compactness.

According to scheme 3 described inventions, to with the axis normal of live axle parallel on the projection drawing of projection, live axle and driven shaft are configured in the driven pulley of V-belt formula speed changer, be easy to guarantee the configuration space of gear reducer, simultaneously, can be with the power unit compactness.

According to scheme 4 described inventions, can form same shape with forming the one-level deceleration driven gear of one and double reduction driven gear and three grades of reduction drive gear of double reduction actuation gear and formation one, can reduce the number of packages of parts.

According to scheme 5 described inventions, but because free rotary ground supporting live axle and driven shaft, so, can simplify the processing that crankcase is applied, simultaneously, can reduce the surface pressure of the support that causes by crankcase of live axle and driven shaft.

And then, according to scheme 6 described inventions, can simplify respectively as the one-level deceleration driven gear of one and the lubricating structure of double reduction actuation gear and double reduction driven gear and the support of three grades of reduction drive gear on driven shaft and live axle, can will be used for the lubricated of each gear meshing portion from the oil that flows out between first and second metal bearing and one-level deceleration driven gear and double reduction actuation gear and double reduction driven gear and the three grades of reduction drive gear.

Description of drawings

Fig. 1 is the side view of two-wheeled motor vehicle.

Fig. 2 is the side view of power unit.

Fig. 3 is the sectional view of the 3-3 line of Fig. 2.

Embodiment

Below, based on one embodiment of the present of invention shown in the drawings form of implementation of the present invention is described.

Fig. 1～Fig. 3 represents one embodiment of the present of invention, and Fig. 1 is the side view of two-wheeled motor vehicle, and Fig. 2 is the side view of power unit, and Fig. 3 is the 3-3 line sectional view of Fig. 2.

In addition, in embodiment's below the explanation, front and back and about refer to be in the direction under the state in direct of travel the place ahead of two-wheeled motor vehicle.

At first, in Fig. 1, the vehicle body frame F of this two-wheeled motor vehicle is equipped with: can turn to preceding pipe 6 that the front fork 5 of axle supporting front-wheel WF is supported; The main vehicle body frames 7 that pipe 6 extends to the rear lower side before this; Extend and connect the vehicle seat strut rail 8 that is arranged on aforementioned main vehicle body frame 7 bottoms to the back upper place.Steering tiller 9 is connected the top of aforementioned front fork 5, and the vehicle seat 10 that the passenger takes usefulness is set on aforementioned vehicle seat strut rail 8.

By motor E and the output of this motor E is being carried out the infinite variable speed power unit P that simultaneously the power transmitting deice T of its deceleration is constituted, suspend in midair in the mode that is configured in aforementioned vehicle body frame F below and to be bearing on the aforementioned main vehicle body frame 7, trailing wheel WR axle is bearing in front end and is bearing in swingably between the rear portion of a pair of swing arm 11,12 on this power unit P, the output of power unit P passes to trailing wheel WR via the described chain drive shown in Figure 3 13 in back, between swing arm 11,12 and vehicle seat strut rail 8 posterior bumper 14... is set.

In addition, the place ahead of preceding pipe 6 is covered by anterior overhead guard 15, the rear of preceding pipe 6 and the front portion of main vehicle body frame 7 are covered by main vehicle body frame overhead guard 16, the side of main vehicle body frame 7 is covered by main vehicle body frame side cover 17..., both sides at main vehicle body frame side cover 17, the leg protective cover 18... connection that covers passenger's shank from the place ahead is arranged on the aforementioned anterior overhead guard 15, connects in the bottom of main vehicle body frame side cover 17... the end cover 19 that covers power unit P from the place ahead is set.

In Fig. 2 and Fig. 3, the motor E of power unit P is equipped with: crankcase 21, with forward lean be incorporated into crankcase 21 front ends cylinder block 22, be incorporated into the cylinder head 23 of cylinder block 22 front ends.

But bent axle 24 free rotary ground supportings with axis that direction to the left and right extends are in crankcase 21, the piston 26 that is coupled to slidably in the cylinder barrel 25 that has cylinder block 22 is connected on the bent axle 24 via connecting rod 27 and crank pin 28, spark plug 29 is installed on cylinder head 23, simultaneously, configuration has the valve actuating gear 31 of camshaft 30

Crankcase 21 is to constitute by mutually combining with about vertical left side case halfbody 21L that divides of the axis that comprises cylinder barrel 25 and right side case halfbody 21R, on the left of bent axle 24 can connect with rotating freely and right

side case halfbody

21L, 21R.

In the foreign side of aforementioned left side case halfbody 21L, driving sprocket wheel 32 is fixed on the bent axle 24, and driven sprocket 33 is fixed on the camshaft 30 that has aforementioned valve actuating gear 31, the annular timing chain 34 of reeling on driving sprocket wheel 32 and driven sprocket 33.And on left side case halfbody 21L, cylinder block 22 and cylinder head 23, setting makes aforementioned timing chain 34 move the chain path 35 of usefulness.

In addition, left side cover 36 is fastened on the case halfbody 21L of left side in the mode of the left part of covering bent axle 24, constitutes generator 39 by the rotor 37 of the left part of being fixed in bent axle 24 and the stator 38 that is fixed on the aforementioned left side cover 36 in the mode that covers this rotor 37.

Power transmitting deice T is by as the V-belt formula speed changer 41 of stepless speed variator, constitute the gear reducer 42 of three grades of decelerations of output of V-belt formula speed changer 41, the speed changer case 44 of the speed changer chamber 43 of V-belt formula speed changer 41 is held in formation, is made of the outside case 46 that is fastened to the inboard case 45 on the case halfbody 21R of right side and be attached on this inboard case 45 from the right side.

Between aforementioned speed changer case 44 and aforementioned crankcase 21, actuation gear 47 is fixed to the right part of aforementioned bent axle 24, being engaged to driven gear 48 on the aforementioned actuation gear 47 is fixed in and has the axis parallel with bent axle 24, can connect on first 49 of aforementioned inboard case 45 with rotating freely, but the intermediate portion of first 49 axial direction via ball bearing 51 free rotary ground supportings in inboard case 45, but two ends of first 49 via roller bearing 52 and ball bearing 53 free rotary ground supportings in right case halfbody 21R and outside case 46.In addition, second 54 that has with first 49 parallel axis can connect inboard case 45 and right side case halfbody 21R with rotating freely, but the intermediate portion of this axial direction of second 54 via as ball bearing 55 free rotary ground supportings of clutch shaft bearing in the case halfbody 21R of right side, but second 54 two end part via as ball bearing 56 free rotary ground supportings of second bearing in the case halfbody 21L of left side, simultaneously, but via ball bearing 57 free rotary ground supportings in outside case 46.And, between first 49 and inboard case 45, clamp the sealing component 58 of annular, between second 54 and inboard case 45, clamp annular seat component 59.

V-belt formula speed changer 41 is equipped with: be installed to driving pulley 61 on first 49 in speed changer chamber 43, be installed to driven pulley 62 on second 54, be wound up into the V-belt 63 of the annular on driving pulley 61 and the driven pulley 62 via centrifugal clutch 64 in speed changer chamber 43.

Driving pulley 61 is made of fixed pulley half 65 and movable pulley half 66, fixed pulley half 65 is fixed on first 49 the part of close inboard case 45, movable pulley half 66 is being leaned on the axial direction outside, can be installed to slidably on first 49 along axial direction than fixed pulley half 65, and V-belt 63 is wound up on the circular groove 67 that is formed at the V font between two pulley half 65,66.In addition, in the back side of movable pulley half 66, swash plate (ramp plate) 68 is fixed on first 49, between movable pulley half 66 and swash plate 68, holds a plurality of counterweight roller 69... with the state that floats.And, when increase along with the rotating speed of bent axle 24, when first spool 49 rotating speed increases, the counterweight roller 69... that is subjected to centrifugal force moves to the foreign side of first 49 radial direction, makes movable pulley half 66 near fixed pulley half 65.By this, V-belt 63 becomes big to the contact radius of two

pulley half

65,66.

Driven pulley 62 comprises: can rotate relatively, center on second 54 inner core 71 coaxially, can relatively move around the relative rotation of axis and along axial direction, the urceolus 72 that cooperates with inner core 71 slidably, be fixed to the fixed pulley half 73 on the inner core 71, with these fixed pulley half 73 subtends, be fixed to the movable pulley half 74 on the urceolus 72, be arranged between inner core 71 and the urceolus 72, according to the relative rotatable phase difference between this movable pulley half 74 and the fixed pulley half 73 to two pulley half 73, torque cam mechanism (torque cam) mechanism 75 of the component of effect axial direction between 74 is with the helical spring 76 of movable pulley half 74 to the loading of fixed pulley half 73 side elastic force; V-belt 63 is wound on the V font groove 77 that is formed between fixed pulley half 73 and the movable pulley half 74.

In addition, centrifugal clutch 64 is configured between aforementioned driven pulley 62 and the inboard case 45, comprise: be fixed on the driver plate 78 on the aforementioned urceolus 72, with the mode that covers this driver plate 78 form cup-shaped, be fixed to the clutch housing 79 on aforementioned second 54, can be with interior all rubbing contact of this clutch housing 79, be installed to a plurality of clutch weight 80... on the aforementioned driver plate 78.

And, interval between fixed pulley half on the driven pulley 62 73 and movable pulley half 74, power according to the axial direction that produces by aforementioned torque cam mechanism mechanism 75, the elastic force of the axial direction that produces by helical spring 76, and by deciding along the balance between the power that comes from V-belt 63 of the septal direction effect between fixed pulley half 73 and the movable pulley half 74, on driving pulley 61, when by making movable pulley half 66 near fixed pulley half 65, when the winding radius of V-belt 63 on driving pulley 61 became big, the winding radius of V-belt 63 on driven pulley 62 diminished.

Dispose the jack shaft 83 that has with this second 54 parallel axis at aforementioned second 54 rear, but the two end part of this jack shaft 83 via as ball bearing 84,85 free rotary ground supportings of the 3rd and the 4th bearing on the right side and left

side case halfbody

21R, 21L of crankcase 21, be configured for being fixed to from the left part of the outstanding jack shaft 83 of left side case halfbody 21L to the driving sprocket wheel 86 of the part of the chain drive 13 of trailing wheel WR transferring power.

And aforementioned jack shaft 83 on the projection drawing of projection on perpendicular to the plane of jack shaft 54 axis, is configured in the centrifugal clutch 64 and aforementioned driven pulley 62 that is installed on this jack shaft 54.

Gear reducer 42 is arranged on aforementioned second 54 and aforementioned jack shaft 83 centres in crankcase 21, comprise: be fixed on the one-level reduction drive gear 87 on second 54, can be rotated to support on one-level deceleration driven gear 88 on the jack shaft 83 to be engaged to mode on the one-level reduction drive gear 87, double reduction actuation gear 89 with one-level deceleration driven gear 88 formation one, can be rotated to support on aforementioned second 54, be engaged to the double reduction driven gear 90 on the double reduction actuation gear 89, three grades of reduction drive gear 91 with double reduction driven gear 90 formation one are fixed on the aforementioned jack shaft 83, be engaged to three grades of deceleration driven gears 92 on three grades of reduction drive gear 91; Between the one-level deceleration driven gear 88 that becomes one and double reduction actuation gear 89 and jack shaft 83, clamp first metal bearing 93 cylindraceous, between the double reduction driven gear 90 that becomes one and three grades of reduction drive gear 91 and second 54, clamp second metal bearing 94 cylindraceous.

In addition, aforementioned one-level reduction drive gear 87, double reduction driven gear 90 and three grades of reduction drive gear 91 are at aforementioned ball bearing 55, be installed between 56 on second 54, second 54 in aforementioned one-level reduction drive gear 87, the axial direction both sides of double reduction driven gear 90 and three grades of reduction drive gear 91 are via ball bearing 55, but 56 free rotary ground supportings are on crankcase 21, relative therewith, aforementioned one-level deceleration driven gear 88, double reduction actuation gear 89 and three grades of deceleration driven gears 92 are at aforementioned ball bearing 84, be installed between 85 on the jack shaft 83, at aforementioned one-level deceleration driven gear 88, one side of the axial direction of double reduction actuation gear 89 and three grades of deceleration driven gears 92, jack shaft 83 is on the direction of the axis of this jack shaft 83, via being configured in and aforementioned ball bearing 55 roughly the same locational ball bearings 84, but free rotary ground supporting is on the case halfbody 21R of the right side of crankcase 21, at one-level deceleration driven gear 88, the opposite side of the axial direction of double reduction actuation gear 89 and three grades of deceleration driven gears 92, jack shaft 83 is on the axial direction of this jack shaft 83, via being configured in and aforementioned ball bearing 56 roughly the same locational ball bearings 85, but free rotary ground supporting is on the case halfbody 21L of the left side of aforementioned crankcase 21.

And, to all be set at identical reduction speed ratio by the reduction speed ratio that one-level reduction drive gear 87 and one-level deceleration driven gear 88, double reduction actuation gear 89 and double reduction driven gear 90, three grades of reduction drive gear 91 and three grades of deceleration driven gears 92 form, the one-level deceleration driven gear 88 that will become one and the shape of double reduction actuation gear 89 become identical shape with the shape set of the double reduction driven gear 90 that becomes one and three grades of reduction drive gear 91.

In addition, clamping on the one-level deceleration driven gear 88 and first metal bearing 93 between double reduction actuation gear 89 and the jack shaft 83 that becomes one, in position corresponding to the intermediate portion between one-level deceleration driven gear 88 and the double reduction actuation gear 89, in the mode of extending oilhole 107 is set along radial direction, the inner of this oilhole 107 be arranged on jack shaft 83 path 105 that oils coaxially and be communicated with, simultaneously, its outer end is in peripheral openings, on second metal bearing 94 that clamps between the double reduction driven gear 90 that becomes one and three grades of reduction drive gear 91 and second 54, in position corresponding to the intermediate portion between double reduction driven gear 90 and the three grades of reduction drive gear 91, in the mode of extending oilhole 108 is set along radial direction, the inner of this oilhole 108 is communicated with the oily path 106 that is arranged on coaxially on second 54, and its outer end is in peripheral openings.And the oily feed path (not shown) from be located at crankcase 21 is oily to oily path 106 supplies of being located at the oily path 105 on the aforementioned jack shaft 83 and be located on aforementioned second 54.

But have on the rear portion and crankcase 21 of the inboard case 45 of foot pedal starting axle 95 free rotary ground supportings in speed changer case 44 of the axis parallel, foot-on pedal 96 is set in the outer end of this foot pedal starting axle 95 with bent axle 24.In addition, interior side's side at aforementioned inboard case 45, but the foot-operated actuation gear 98 of free rotary ground supporting on foot pedal starting axle 95, the power corresponding to the foot pedal starting axle 95 of trampling operation of kick pedal 96 passes to aforementioned foot-operated actuation gear 98 via pedal-start device 97.In addition, the rotating power of foot-operated actuation gear 98 passes to bent axle 24 via first idler gear 99, second idler gear 100, the 3rd idler gear 101, but described first idler gear, 99 free rotary ground supportings are engaged on the foot-operated actuation gear 98 in the right part from the outstanding jack shaft 83 of the right side case halfbody 21R of aforementioned crankcase 21; But described second idler gear 100 free rotary ground supporting between aforementioned crankcase 21 and speed changer case 44 is engaged on first idler gear 99 on second 54; Described the 3rd idler gear 101 and second idler gear 100 form one, are engaged to simultaneously on the actuation gear 47 of right part of aforementioned bent axle 24.

Secondly, effect for this embodiment describes, owing to be arranged between with axis of being parallel to each other second 54 and the jack shaft 83, the gear reducer pairs setting system that constitutes the part of power unit P has: be fixed to the one-level reduction drive gear 87 on second 54, be engaged on the one-level reduction drive gear 87, can be rotated to support on the one-level deceleration driven gear 88 on the jack shaft 83, double reduction actuation gear 89 with one-level deceleration driven gear 88 formation one, can be rotated to support on aforementioned second 54, be engaged to the double reduction driven gear 90 on the double reduction actuation gear 89, three grades of reduction drive gear 91 with double reduction driven gear 90 formation one, be fixed on the aforementioned jack shaft 83, be engaged to three grades of deceleration driven gears 92 on three grades of reduction drive gear 91, so, be input to second 54 power, shown in the dot and dash line of Fig. 3, via passing through one-level deceleration driven gear 88 successively from the one-level reduction drive gear 87 that is installed on second 54, double reduction actuation gear 89, double reduction driven gear 90, the S shape bang path of three grades of reduction drive gear 91 and three grades of deceleration driven gears 92, slow down and pass to jack shaft 83 by three grades, can shorten the axle base of second 54 and jack shaft 83, simultaneously, can set the external diameter that constitutes each gear 87～92 of gear reducer 42 smaller, and can obtain big reduction speed ratio, shortening with the direction of the axis normal of second 54 and jack shaft 83 on the length of gear reducer 42, can avoid the increase of cost and weight.And second 54 and jack shaft 83 rotatably are configured in the position of mutual isolation, and the structure of gear reducer 42 is complicated.

In addition, second 54 and the part of the jack shaft 83 power unit Ps of formation lift-launch on two-wheeled motor vehicle and the fore-and-aft direction devices spaced apart configuration of two-wheeled motor vehicle, to with the plane of second 54 axis normal on the projection drawing of projection, jack shaft 83 is configured in the centrifugal clutch 64 and driving pulley 62 that is installed on this second 54, so, can easily guarantee the configuration space of gear reducer 42, simultaneously, can be with power unit P compactness.

In addition, owing to all set one-level reduction drive gear 87 and one-level deceleration driven gear 88, double reduction actuation gear 89 and double reduction driven gear 90, three grades of reduction drive gear 91 for identical reduction speed ratio with the reduction speed ratio that three grades of deceleration driven gears 92 form, so, one-level deceleration driven gear 88 and the double reduction actuation gear 89 that forms one identical shape can be formed with the double reduction driven gear 90 that forms one and three grades of reduction drive gear 91, the number of packages of parts can be reduced.

In addition, in aforementioned one-level reduction drive gear 87, the axial direction both sides of double reduction driven gear 90 and three grades of reduction drive gear 91, aforementioned second 54 via ball bearing 55, but 56 free rotary ground supportings are in crankcase 21, at aforementioned one-level deceleration driven gear 88, one side of the axial direction of double reduction actuation gear 89 and three grades of deceleration driven gears 92, but aforementioned jack shaft 83 on the direction of the axis of this jack shaft 83 via be configured in roughly the same locational ball bearing 84 free rotary ground supportings of aforementioned ball bearing 55 on the case halfbody 21R of the right side of crankcase 21, at aforementioned one-level deceleration driven gear 88, the opposite side of the axial direction of double reduction actuation gear 89 and three grades of deceleration driven gears 92, on the direction of the axis of aforementioned jack shaft 83, but via be configured in roughly the same locational ball bearing 85 free rotary ground supportings of aforementioned ball bearing 56 on the case halfbody 21L of the left side of crankcase 21.

Rotational supporting structure according to the crankcase 21 of this second 54 and jack shaft 83, but because second 54 of free rotary ground supporting and jack shaft 83, so, can simplify the processing that crankcase 21 is applied, simultaneously, can reduce the surface pressure of the support that produces by crankcase 21 of second 54 and jack shaft 83.

And then, but form the one-level deceleration driven gear 88 of one and double reduction actuation gear 89 via first metal bearing, 93 free rotary ground supportings cylindraceous on aforementioned jack shaft 83, but form the double reduction driven gear 90 of one and three grades of reduction drive gear 91 via second metal bearing, 94 free rotary ground supportings cylindraceous on second 54, at first and second metal bearing 93, on 94, along radial direction oilhole 107 is set respectively with extending, 108, described oilhole 107,108 the inner and the oily path 105 that is arranged on coaxially on aforementioned jack shaft 83 and aforementioned second 54,106 are communicated with, simultaneously, its outer end is in peripheral openings, so, can simplify one-level deceleration driven gear 88 and double reduction actuation gear 89, and the lubricating structure of the support on jack shaft 83 and second 54 of double reduction driven gear 90 and three grades of reduction drive gear 91, can be with from first and second metal bearings 93,94, one-level deceleration driven gear 88 and double reduction actuation gear 89, the oil that flows out between double reduction driven gear 90 and the three grades of reduction drive gear 91 is used for engaging piece lubricated of each gear 87～92.

Above, embodiments of the invention are illustrated, but the present invention is not limited to the foregoing description, in the scope that does not exceed claim, under the described situation of the present invention, can carry out the change in the various designs.

Claims

1. gear reducer, described gear reducer is located between live axle (54) and the driven shaft (83), it is characterized in that, is equipped with: being fixed on can be around the one-level reduction drive gear (87) on the aforementioned live axle (54) of axis rotation; With aforementioned live axle (54) position spaced place can be bearing in the relative rotation can around the aforementioned driven shaft (83) of the axis rotation that is parallel to this live axle (54) go up and with the one-level deceleration driven gear (88) of aforementioned one-level reduction drive gear (87) engagement; Double reduction actuation gear (89) with one-level deceleration driven gear (88) formation one; Can be bearing in the relative rotation aforementioned live axle (54) go up, with the double reduction driven gear (90) of double reduction actuation gear (89) engagement; Three grades of reduction drive gear (91) with double reduction driven gear (90) formation one; Be fixed to aforementioned driven shaft (83) go up, with three grades of deceleration driven gears (92) of three grades of reduction drive gear (91) engagement.

2. gear reducer as claimed in claim 1, it is characterized in that, aforementioned live axle (54) and aforementioned driven shaft (83) constitute a part of carrying the power unit (P) on vehicle, and fore-and-aft direction devices spaced apart ground configuration along vehicle, to with the plane of the axis normal of aforementioned live axle (54) on projection drawing on, aforementioned driven shaft (83) is configured in the centrifugal clutch (64) that is installed on this live axle (54).

3. gear reducer as claimed in claim 1, it is characterized in that, aforementioned live axle (54) and aforementioned driven shaft (83) have V-belt formula speed changer (41), constitute a part of carrying the power unit (P) on vehicle, and fore-and-aft direction devices spaced apart ground configuration along vehicle, to with the plane of the axis normal of aforementioned live axle (54) on projection drawing on, aforementioned driven shaft (83) is configured in a part that constitutes aforementioned V-belt formula speed changer (41) and is installed in the driven pulley (62) on the aforementioned live axle (54).

4. as any one described gear reducer in the claim 1～3, it is characterized in that, will set for all identical by the reduction speed ratio that one-level reduction drive gear (87) and one-level deceleration driven gear (88), double reduction actuation gear (89) and double reduction driven gear (90), three grades of reduction drive gear (91) and three grades of deceleration driven gears (92) form.

5. as any one described gear reducer in the claim 1～4, it is characterized in that, in aforementioned one-level reduction drive gear (87), the both sides of the axial direction of double reduction driven gear (90) and three grades of reduction drive gear (91), aforementioned live axle (54) is via first and second bearing (55,56) but free rotary ground supporting on the crankcase (21) of motor (E), at aforementioned one-level deceleration driven gear (88), one side of the axial direction of double reduction actuation gear (89) and three grades of deceleration driven gears (92), aforementioned driven shaft (83) on the direction of the axis of this driven shaft (83) via being configured in roughly the same locational the 3rd bearing (84) of aforementioned clutch shaft bearing (55) but free rotary ground supporting in aforementioned crankcase (21), at aforementioned one-level deceleration driven gear (88), the opposite side of the axial direction of double reduction actuation gear (89) and three grades of deceleration driven gears (92), aforementioned driven shaft (83) can be rotated to support in the aforementioned crankcase (21) via being configured in roughly the same locational the 4th bearing (85) of aforementioned second bearing (56) on the direction of the axis of this driven shaft (83).

6. as any one described gear reducer in the claim 1～5, it is characterized in that, form the aforementioned one-level deceleration driven gear (88) and the aforementioned double reduction actuation gear (89) of one, via first metal bearing cylindraceous (93) but free rotary ground supporting on aforementioned driven shaft (83), form aforementioned double reduction driven gear (90) and aforementioned three grades of reduction drive gear (91) of one, via second metal bearing cylindraceous (94) but free rotary ground supporting on aforementioned live axle (54), at first and second metal bearing (93,94) on, along radial direction oilhole (107 is set respectively with extending, 108), described oilhole (107,108) the inner and the oily path (105 that is arranged on coaxially on aforementioned driven shaft (83) and the aforementioned live axle (54), 106) be communicated with, simultaneously, its outer end is in peripheral openings.