阅读说明：本技术 摩托车的传动结构 (Transmission structure of motorcycle ) 是由 赖建宏 余孟霖 杨思待 于 2020-09-08 设计创作，主要内容包括：本发明关于一种摩托车的传动结构,该摩托车具有一动力系统,该动力系统至少包括有动力源单元、第一传动单元、第二传动单元、第三传动单元；其中,该第一传动单元的一侧设有该动力源单元及该第三传动单元；该第一传动单元至少包括有伸入该第二传动单元并将该动力源单元的动力传递到该第二传动单元的第一输出轴；该第二传动单元至少包括有将动力传递到第三传动单元的第二输出轴；该第三传动单元至少包括有将动力传递到车轮的第三输出轴；其中,该第一输出轴与该第二输出轴为同轴排列,该后摇臂枢设于该传动部外侧并以该第二输出轴旋转。(The invention relates to a transmission structure of a motorcycle, which is provided with a power system, wherein the power system at least comprises a power source unit, a first transmission unit, a second transmission unit and a third transmission unit; wherein, one side of the first transmission unit is provided with the power source unit and the third transmission unit; the first transmission unit at least comprises a first output shaft which extends into the second transmission unit and transmits the power of the power source unit to the second transmission unit; the second transmission unit at least comprises a second output shaft which transmits power to the third transmission unit; the third transmission unit at least comprises a third output shaft for transmitting power to wheels; the first output shaft and the second output shaft are coaxially arranged, and the rear rocker arm is pivoted outside the transmission part and rotates by the second output shaft.)

1. The transmission structure of the motorcycle is characterized in that the motorcycle is provided with a power system, and the power system at least comprises a power source unit, a first transmission unit, a second transmission unit and a third transmission unit; wherein, one side of the first transmission unit is provided with the power source unit and the third transmission unit; the first transmission unit at least comprises a first output shaft which extends into the second transmission unit and transmits the power of the power source unit to the second transmission unit; the second transmission unit at least comprises a second output shaft which transmits power to a third transmission unit; the third transmission unit at least comprises a third output shaft which transmits power to wheels; the first output shaft and the second output shaft are coaxially arranged, and the rear rocker arm is pivoted on the outer side of the transmission part and rotates by the second output shaft.

2. The transmission structure of a motorcycle according to claim 1, wherein the first transmission unit is constituted by a right case of the transmission portion and an outer cover provided to cover an outer side of the right case.

3. The transmission structure of a motorcycle according to claim 1, wherein a rear end of the power system is pivotally provided with the rear rocker arm; the axis of the first output shaft, the axis of the second output shaft and the axis of the pivot center of the rear rocker arm are the same axis.

4. The transmission structure of a motorcycle according to claim 1, wherein the transmission section has a transmission case, one side of which is covered with an outer cover to constitute a belt continuously variable transmission system chamber provided with a belt continuously variable transmission system of the transmission section; a connecting cover is covered between the outer side of the rear section of the transmission part and the outer cover.

5. The transmission structure of a motorcycle according to claim 4, wherein the coupling cover has a through hole through which the first output shaft of the transmission portion passes.

6. A transmission structure for a motorcycle according to claim 5, wherein a stepped receiving portion is provided on an inner peripheral edge of the through hole, and the receiving portion is provided with a dust boot.

7. The transmission structure of a motorcycle according to claim 4, wherein the coupling cover is locked to a right case of the transmission portion, and the coupling cover is provided with connecting end surfaces for connection toward upper and lower sides of the right case.

8. A transmission structure for a motorcycle according to claim 7, wherein a leak-proof gasket is provided at a junction of the connection end face and an outer end edge of the right case.

9. A transmission structure for a motorcycle according to claim 7, wherein said connection end face is substantially vertical.

10. A transmission structure for motorcycles as claimed in claim 8, wherein said leakage preventing spacer is made of an elastic material, and has a substantially Z-shaped or T-shaped cross section.

Technical Field

The present invention relates to a transmission structure of a motorcycle, and more particularly, to a transmission structure of a motorcycle, which can effectively improve the use effect of each transmission member between a second output shaft and a rear wheel, and can move a rear rocker arm toward the front of a vehicle body, thereby reducing the wheel base between a front wheel and the rear wheel, and further miniaturizing the motorcycle.

Background

As shown in fig. 1, a motorcycle having a rear swing arm, such as the patent of "structure of scooter type motorcycle" I359766, is provided, in which a belt stepless speed change system 13 driven by a crankshaft 12 is connected to one side of the crankshaft 12 of an engine unit 11 of a scooter type motorcycle 1, a speed reduction and clutch system 14 connected to a driven shaft 131 of the belt stepless speed change system 13 and driven by the driven shaft 131 is provided, the speed reduction and clutch system 14 can drive an output shaft 15, the output shaft 15 is provided with a driving wheel 151, the driving wheel 151 drives a driving wheel 171 provided on a rear wheel 17 by a belt-shaped transmission member 16, the rear wheel 17 is pivoted to a rear end of a rear swing arm 18, and a front end of the rear swing arm 18 is pivoted to an outer side of the output shaft 15.

The transmission arrangement of the patent document I359766 "structure of scooter type motorcycle" is a structure in which the crankshaft 12, the driven shaft 131, the output shaft 15, the rear rocker 18, and the rear wheel 17 are arranged in this order from the front of the vehicle body toward the rear of the vehicle body, and therefore the axial distance between the front wheel (not shown) and the rear wheel 17 of the scooter type motorcycle 1 is increased, more specifically, the transmission arrangement of the patent document I359766 "structure of scooter type motorcycle" is a structure in which the longitudinal length of the vehicle body of the scooter type motorcycle 1 is increased, and therefore the size of the scooter type motorcycle 1 is forced to be increased.

Disclosure of Invention

[ problem ] to solve the problem

The invention mainly aims to provide a transmission structure of a motorcycle, which can effectively improve the use effect of each transmission part between a second output shaft and a rear wheel, shorten the wheelbase of the front wheel and the rear wheel of the motorcycle and further miniaturize the motorcycle.

[ MEANS FOR SOLVING PROBLEMS ] A method for producing a semiconductor device

To achieve the above object, the present invention provides a transmission structure of a motorcycle, the motorcycle having a power system, the power system at least including a power source unit, a first transmission unit, a second transmission unit, and a third transmission unit; wherein, one side of the first transmission unit is provided with the power source unit and the third transmission unit; the first transmission unit at least comprises a first output shaft which extends into the second transmission unit and transmits the power of the power source unit to the second transmission unit; the second transmission unit at least comprises a second output shaft which transmits power to the third transmission unit; the third transmission unit at least comprises a third output shaft for transmitting power to wheels; the first output shaft and the second output shaft are coaxially arranged, and the rear rocker arm is pivoted outside the transmission part and rotates by the second output shaft.

Therefore, the main technical means of the invention in item 2 is to provide a transmission structure of a motorcycle, wherein the first transmission unit is composed of a right box body of the transmission part and an outer cover covering the outer side of the right box body.

Therefore, the main technical means of the invention in item 3 is to provide a transmission structure of a motorcycle, wherein a rear rocker arm is pivoted at the rear end of a power system; the axis of the first output shaft, the axis of the second output shaft and the axis of the pivot center of the rear rocker arm are the same axis.

Therefore, the main technical means of the present invention in item 4 is to provide a transmission structure of a motorcycle, wherein the transmission part has a transmission case, one side of the transmission case is covered with an outer cover to form a belt stepless speed change system chamber, and the belt stepless speed change system chamber is provided with a belt stepless speed change system of the transmission part; a connecting cover is covered between the outer side of the rear section of the transmission part and the outer cover.

Therefore, the main technical means of the invention in the 5 th aspect is to provide a transmission structure of a motorcycle, wherein the connecting cover has a through hole for the first output shaft of the transmission part to pass through.

Therefore, the main technical means of the present invention in item 6 is to provide a transmission structure of a motorcycle, wherein the inner periphery of the through hole is provided with a receiving portion in a stepped shape, and the receiving portion is provided with a dust cover.

Therefore, the main technical means of the present invention in item 7 is to provide a transmission structure of a motorcycle, wherein the connecting cover is locked on a right box body of the transmission part, and the connecting cover is provided with connecting end faces for connection towards the upper side and the lower side of the right box body.

Therefore, the main technical means of the present invention in item 8 is to provide a transmission structure of a motorcycle, wherein a leak-proof gasket is disposed at the connection position of the connection end face and the outer end edge of the right box body.

Therefore, the main technical means of the present invention in item 9 is to provide a transmission structure of a motorcycle, wherein the connecting end surface is substantially vertical.

Therefore, the main technical means of the present invention 10 is to provide a transmission structure of a motorcycle, wherein the anti-leakage gasket is made of elastic material, and the cross section of the anti-leakage gasket is substantially Z-shaped or T-shaped.

[ Effect of the invention ]

The invention can achieve the effects by the main technical means of item 1: borrow this can avoid this back rocking arm when swing between this second output shaft to this third output shaft apart from changing, and then can lead to the fact to pull to each drive disk assembly between this second output shaft to this rear wheel, consequently can effectively promote the result of use of each drive disk assembly between this second output shaft to this rear wheel, on the other hand can make this back rocking arm move towards automobile body the place ahead and establish to can reduce the wheel base of this front wheel and this rear wheel, and then can make this motorcycle miniaturized.

The invention can achieve the following effects by the main technical means of item 2: whereby assembly of the rear rocker arm can be facilitated.

The invention can achieve the following effects by the main technical means of item 3: therefore, the first transmission unit, the second transmission unit and the third transmission unit are independently arranged, so that the arrangement distance between the second output shaft and the power source unit can be shortened, the whole length of the power system can be effectively shortened, the power system can be miniaturized, more spaces for arranging other components of the motorcycle can be increased, the axle distance between the rear wheel of the motorcycle and the power source unit can be shortened, the swinging inertia of the rear rocker arm can be reduced, and the controllability of the motorcycle can be improved.

The invention can achieve the effects by the main technical means of items 4, 5 and 6: therefore, the operability of the speed reducing gear set and the belt stepless speed change system can be ensured.

The invention can achieve the effects by the main technical means of item 7: therefore, the connection between the connection cover and the transmission part can be facilitated.

The invention can achieve the effects by the main technical means of 8 th, 9 th and 10 th: therefore, on one hand, the manufacturing tolerance of the connecting cover and the right box body can be eliminated, and on the other hand, the connecting position of the connecting end surface and the outer end edge of the right box body can have better leakage-proof effect.

Drawings

FIG. 1 is a schematic diagram of a prior art motorcycle power system.

FIG. 2 is a schematic side view of the motorcycle of the present invention.

FIG. 3 is a cross-sectional view of the motorcycle power system of the present invention.

Fig. 4 is an enlarged view of a portion of the power system of the motorcycle of fig. 3.

Fig. 5 is a perspective view of the transmission case of the motorcycle power system of the present invention.

Fig. 6 is a perspective view of a coupling cover of the motorcycle power system of the present invention.

Fig. 7 is a perspective view of the other side of the coupling cover of the motorcycle power system of the present invention.

FIG. 8 is a perspective view of the leak-proof gasket of the present invention.

List of reference numerals

1: scooter type motorcycle

11: engine unit

12: crankshaft

13: belt continuously variable transmission system 131: driven shaft

14: speed reduction and clutch system

15: output shaft 151: driving wheel

16: transmission member

17: rear wheels 171: driving wheel

18: rear rocker arm

2: motorcycle with a motorcycle body

3: frame unit

31: head pipe part

32: steering mechanism

33: descending pipe part

34: pedal tube portion 341: pedal horizontal tube

35: side frame part

351: the rising section 352: extension section

353: the auxiliary pipe 354: extension piece

4: seat cushion

5: power system

5 a: power source unit

5 b: first transmission unit

5 c: second transmission unit

5 d: third transmission unit

51: cylinder part

511: cylinder head cover 512: cylinder head

513: cylinder body

52: transmission part

52 a: right case 52 b: left box

52 c: outer cover

53: transmission case

53 a: crank chamber 53 b: reduction gear unit chamber

53 c: belt stepless speed change system chamber

54: crankshaft

541: connecting rod 542: piston

55: reduction gear set

56: belt stepless speed change system

561: the driving wheel 562: driven wheel

563: the belt 564 is driven: first output shaft

57: second output shaft 571: power output wheel

58: first support member

59: second support member

6: rear rocker arm

61: first pivot joint part

62: second pivot joint part

63: third output shaft

7: driving wheel

8: transmission member

9: connecting cover

91: perforation 92: receiving part

93: the dust cover 94: leak-proof gasket

9 a: connection end surface 9 b: connecting end face

A: front fork unit

C: storage box

E: electric machine member

D: center line

M: exhaust pipe

J: heat radiation unit

K: clutch device

FW: front wheel

RW: rear wheel

P: foot rest

T: fuel tank

Y: the center of the axis.

Detailed Description

For easier understanding of the structure and achieved efficacy of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings.

First, referring to fig. 2, the motorcycle 2 includes a frame unit 3, a seat cushion 4 disposed on the frame unit 3, and a power system 5.

As shown in fig. 2, in the following description, the left and right sides of the vehicle body are shown in the front, with the left hand side of the driver being the left side and the right hand side of the driver being the right side, after the driver is seated on the motorcycle 2. A head pipe part 31 is pivoted in front of the frame unit 3, a steering mechanism 32 is connected to the upper part of the head pipe part 31, a descending pipe part 33 is connected to the head pipe part 31 towards the rear of the vehicle body, a pair of left and right pedal pipe parts 34 which extend towards the rear of the vehicle body and are approximately horizontal are connected to the lower part of the descending pipe part 33, and a pedal horizontal pipe 341 is connected between the tail end of the descending pipe part 33 and the pair of left and right pedal pipe parts 34; a pair of left and right side frame parts 35 extending toward the rear of the bicycle from the pedal pipe part 34, the side frame parts 35 having an ascending section 351 adjacent to the pedal pipe part 34 and an extending section 352 located at the rear of the bicycle, a pair of left and right auxiliary pipes 353 provided between the ascending section 351 and the extending section 352 of the side frame parts 35, and a pair of left and right extending members 354 extending toward the rear of the bicycle from the ascending section 351 adjacent to the pedal pipe part 34; a front fork unit A composed of a front shock absorber is pivoted below the head pipe section 31, and a front wheel FW is pivoted at the lower end of the front fork unit A.

As shown in fig. 2, a footrest P having a substantially flat shape is provided in a substantially horizontal foot tube portion 34 of the frame unit 3, and a footrest portion for allowing a driver to put a foot thereon is formed in a flat shape by the footrest P; a fuel tank T for storing fuel for blasting the power system 5 is installed in an inner space defined between the pair of left and right approximately horizontal step tube portions 34, and the power system 5 is connected to the frame unit 3 and disposed further toward the rear of the vehicle body than the fuel tank T.

As shown in fig. 2, the seat cushion 4 on which the driver can sit is provided above the extending section 352 of the side frame portion 35, and the storage box C is provided below the seat cushion 4 on the extending section 352 of the side frame portion 35; the power system 5 is locked to the auxiliary pipe 353 and the extension member 354 of the side frame portion 35, and the power system 5 is fixed to the frame unit 3 in a non-swinging manner.

As shown in fig. 2 and 3, the power system 5 can be an internal combustion engine or an electric drive motor; the power system 5 is exemplified by a fuel-oil internal combustion engine power system, but the scope of the power system 5 is not limited thereto. The power system 5 has a power source unit 5a, a first transmission unit 5b, a second transmission unit 5c, and a third transmission unit 5 d; the power source unit 5a at least comprises a cylinder part 51 and a transmission part 52, the first transmission unit 5b at least comprises a belt stepless speed change system 56, the second transmission unit 5c at least comprises a reduction gear set 55, and the third transmission unit 5d at least comprises a belt-shaped transmission mechanism consisting of a second output shaft 57, a power output wheel 571 and a driving wheel 7; an exhaust pipe M is disposed on one side of the power source unit 5a, the exhaust pipe M extends from the power source unit 5a to the outside of the first transmission unit 5b toward the rear of the vehicle body, a heat dissipation unit J is disposed on the opposite side of the exhaust pipe M, and the third transmission unit 5d is disposed on the same side of the heat dissipation unit J.

As shown in fig. 2 and 3, the cylinder part 51 extends in a slightly inclined manner toward the front of the vehicle body and partially protrudes outside the rising section 351 of the side frame part 35, that is, the cylinder part 51 extends toward the front of the vehicle body more than the rising section 351 of the side frame part 35; the cylinder part 51 has a cylinder head cover 511, a cylinder head 512 and a cylinder body 513 in sequence from the front of the vehicle body to the rear of the vehicle body, one end (the end facing the rear of the vehicle body) of the cylinder body 513 is connected to the transmission part 52, the cylinder head 512 is connected to the other end of the cylinder body 513 far away from the transmission part 52, and the cylinder head cover 511 is covered on the other end of the cylinder head 512 far away from the end connected to the cylinder body 513.

As shown in fig. 2 and 3, the transmission portion 52 is connected to the cylinder body 513 of the cylinder portion 51 and is away from the other end of the cylinder head 512; the transmission portion 52 is formed by at least a right case 52a and a left case 52b to form a transmission case 53 (the left and right sides are right and left sides when the driver sits on the transmission case), the transmission case 53 is provided therein with a crank chamber 53a for accommodating a crank shaft 54, a reduction gear set chamber 53b for accommodating a reduction gear set 55, and a belt stepless transmission system chamber 53c formed by covering the right case 52a with an outer cover 52c, and the belt stepless transmission system chamber 53c is provided therein with a belt stepless transmission system 56.

As shown in fig. 2 and 3, the crankshaft 54 in the crankshaft chamber 53a of the transmission case 53 is connected to a piston 542 via a connecting rod 541, and the piston 542 is extended into the cylinder body 513, so that the piston 542 is pushed by the explosion force of the cylinder portion 51 during operation to drive the crankshaft 54 to rotate.

As shown in fig. 2, 3 and 4, the belt stepless speed change system 56 is a dry belt stepless speed change mechanism, and the belt stepless speed change system 56 has a driving wheel 561 driven by the crankshaft 54, a driven wheel 562 driven by the driving wheel 561, and a driving belt 563 connected between the driving wheel 561 and the driven wheel 562; after the driving wheel 561 is driven by the crankshaft 54, the driving belt 563 drives the driven wheel 562 to rotate in a stepless speed change manner, a first output shaft 564 is disposed at the center of the driven wheel 562, the first output shaft 564 extends into the reduction gear set chamber 53b from the belt stepless speed change system chamber 53c, so that the first output shaft 564 can drive the reduction gear set 55 located in the reduction gear set chamber 53b to operate, the reduction gear set 55 is a wet reduction gear set, the reduction gear set 55 can drive a second output shaft 57 to operate, and the second output shaft 57 and the first output shaft 564 are coaxially arranged; further, the axis of the crankshaft 54, the axis of the first output shaft 564, and the axis of the second output shaft 57 are arranged parallel to each other in a top view, and the distance between the axis of the crankshaft 54 and the axis of the first output shaft 564, and the distance between the axis of the crankshaft 54 and the axis of the second output shaft 57 are arranged at equal intervals; the second output shaft 57 extends from the reduction gear chamber 53b to the outside of the transmission case 53, more specifically, to the outside of the left case 52b, the second output shaft 57 extends from the outside of the left case 52b and is connected to a power output wheel 571; the belt stepless speed change system 56 is provided with a clutch K on the outer side (upper side in the figure) of the driven wheel 562, that is, the clutch K is arranged between the driven wheel 562 and the outer cover 52c, so that when the clutch K is to be repaired or replaced, an engineer can expose the clutch K to perform the repairing or replacing operation by removing the outer cover 52c, thereby simplifying the repairing or replacing process of the clutch K, and the clutch K can control whether the first output shaft 564 can output power to drive the second output shaft 57.

As shown in fig. 2, 3 and 4, a first supporting member 58 and a second supporting member 59 are disposed on two sides of the transmission case 53, more specifically, the first supporting member 58 is locked on the right case 52a, the second supporting member 59 is locked on the left case 52b, and a rear swing arm 6 is pivotally disposed on the first supporting member 58 and the second supporting member 59; a first pivot joint part 61 and a second pivot joint part 62 are arranged at two sides of the front end of the rear rocker arm 6, and the rear end of the rear rocker arm 6 is pivoted with the rear wheel RW through a third output shaft 63; the first pivot portion 61 of the rear swing arm 6 is pivotally connected to the first supporting member 58, i.e. the first output shaft 564 passes through the first pivot portion 61 and the first supporting member 58, so that the first pivot portion 61 and the first supporting member 58 of the rear swing arm 6 are located between the reduction gear set chamber 53b and the belt stepless speed change system chamber 53c of the transmission case 53; the second pivot portion 62 is pivotally connected to the second supporting member 59, that is, the second output shaft 57 passes through the second pivot portion 62 and the second supporting member 59, so that the second pivot portion 62 of the rear swing arm 6 is pivotally connected to the second supporting member 59, and the second pivot portion 62 is located between the power output wheel 571 of the transmission portion 52 and the transmission case 53, whereby the rear swing arm 6 uses the axial center Y of the second output shaft 57 as the vertical swing (rotation) center, and the first output shaft 564 is coaxial with the axial center Y and swings vertically synchronously with the rear wheel RW relative to the power source unit 5a and the first transmission unit 5 b; the rear wheel RW is provided with a third output shaft 63, the third output shaft 63 is connected to the power output wheel 571 on the second output shaft 57 by a transmission member 8 (a belt or a chain), so that the power output wheel 571 on the second output shaft 57 drives the transmission member 8 to link the third output shaft 63, thereby driving the rear wheel RW to rotate synchronously; it should be noted that the first output shaft 564 passes through the first pivot portion 61 and the first supporting member 58, and the first pivot portion 61 and the first supporting member 58 of the rear swing arm 6 are located between the reduction gear set chamber 53b and the belt stepless speed change system chamber 53c of the transmission case 53, so that the overall configuration of the power system 5 and the rear swing arm 6 can be more compact.

As shown in fig. 3, 4, 5 and 6, a connecting cover 9 is disposed between the outer side of the rear section of the transmission part 52 and the outer cover 52c, i.e. between the right box 52a and the outer cover 52c, and further, the connecting cover 9 is locked on the right box 52 a; the connecting cover 9 has a through hole 91, the through hole 91 is for the first output shaft 564 of the transmission portion 52 to pass through, the inner periphery of the through hole 91 is provided with a receiving portion 92 with a step shape, the receiving portion 92 is provided with a dust-proof cover 93, the first pivot portion 61 of the rear rocker arm 6 is arranged in the through hole 91, furthermore, the dust-proof cover 93 is arranged between the outer periphery of the first pivot portion 61 of the rear rocker arm 6 and the inner periphery of the through hole 91, and the dust-proof cover 93 is arranged between the connecting cover 9 and the first pivot portion 61 of the rear rocker arm 6, since the dust-proof cover 93 is arranged between the first pivot portion 61 and the through hole 91, thereby effectively preventing external moisture or dust from entering into the first pivot portion 61 and the belt stepless speed change system chamber 53c, further preventing the bearing of the first pivot portion 61 from being eroded by external moisture or dust, and ensuring the swinging performance of the rear rocker arm 6, and to ensure the operability of the belt continuously variable transmission system 56.

As shown in fig. 5, 6, 7 and 8, the connecting cover 9 is provided with connecting end faces 9a and 9b for connecting with the outer edge of the right box 52a (which are also approximately vertical) and approximately vertical to the upper and lower sides of the right box 52a, and further, the connecting end faces 9a and 9b and the outer edge of the right box 52a are respectively provided with a leakage-proof gasket 94, the leakage-proof gasket 94 is made of elastic material such as rubber, the leakage-proof gasket 94 has an approximately Z-shaped or t-shaped cross section, so that the leakage-proof gasket 94 is clamped at the connecting position of the connecting end faces 9a and 9b and the outer edge of the right box 52a, thereby eliminating the manufacturing tolerance of the connecting cover 9 and the right box 52a, and the connecting end faces 9a and 9b and the outer edge of the right box 52a can have better leakage-proof effect, i.e. the external dust or moisture can not be prevented from entering from the connecting end face 9a, The joint of the outer edge of the right box body 52a and the outer edge of the right box body 9b penetrates into the transmission part 52, so that the use effect and the service life of each component in the transmission part 52 can be ensured.

The invention has the 1 st efficacy that the motorcycle 2 is provided with a power system 5, and the power system 5 at least comprises a power source unit 5a, a first transmission unit 5b, a second transmission unit 5c and a third transmission unit 5 d; wherein, one side of the first transmission unit 5b is provided with the power source unit 5a and the third transmission unit 5 d; the first transmission unit 5b includes at least a first output shaft 564 that extends into the second transmission unit 5c and transmits the power of the power source unit 5a to the second transmission unit 5 c; the second transmission unit 5c includes at least a second output shaft 57 for transmitting power to the third transmission unit 5 d; the third transmission unit 5d includes at least a third output shaft 63 that transmits power to the rear wheels (wheels) RW; wherein, the first output shaft 564 and the second output shaft 57 are coaxially arranged, and the rear rocker arm 6 is pivoted outside the transmission part 52 and swings around the rotation center of the second output shaft 57; therefore, the distance between the second output shaft 57 and the third output shaft 63 can be prevented from changing when the rear rocker arm 6 swings, and further, each transmission component between the second output shaft 57 and the rear wheel RW can be pulled, so that the use effect of each transmission component between the second output shaft 57 and the rear wheel RW can be effectively improved, and on the other hand, the rear rocker arm 6 can be moved towards the front of the vehicle body, so that the distance between the front wheel FW and the rear wheel RW can be reduced, and further, the motorcycle 2 can be miniaturized.

The invention has the 2 nd effect that the first transmission unit 5b is composed of a right box body 52a of the transmission part 52 and an outer cover 52c covering the outer side of the right box body 52 a; thereby facilitating assembly of the rear rocker arm 6.

The invention has the 3 rd effect that a rear rocker arm 6 is pivoted at the rear end of the power system 5; the axis of the first output shaft 564, the axis of the second output shaft 57 and the axis of the pivot center of the rear rocker arm 6 are the same axis; therefore, the independent arrangement of the first transmission unit 5b, the second transmission unit 5c and the third transmission unit 5d can shorten the arrangement distance between the second output shaft 57 and the power source unit 5a, thereby effectively shortening the overall length of the power system 5, further miniaturizing the power system 5, increasing more space for arranging other components of the motorcycle 2, shortening the distance between the rear wheel RW of the motorcycle 2 and the power source unit 5a, further reducing the swing inertia of the rear rocker arm 6, and improving the maneuverability of the motorcycle 2.

The invention has the effect of the 4 th aspect that the transmission part 52 has the transmission case 53, one side of the transmission case 53 is covered with the outer cover 52c to form a belt stepless speed change system chamber 53c, and the belt stepless speed change system chamber 53c is provided with the belt stepless speed change system 5 of the transmission part 52

6; a connecting cover 9 is covered between the outer side of the rear section of the transmission part 52 and the outer cover 52 c; thereby ensuring the operability of the reduction gear set 55 and the belt continuously variable transmission system 56.

The 5 th effect of the present invention is that, the connecting cover 9 has a through hole 91, and the through hole 91 is provided for the first output shaft 564 of the transmission part 52 to pass through; thereby ensuring the operability of the reduction gear set 55 and the belt continuously variable transmission system 56.

The invention has the 6 th effect that the inner circumference of the through hole 91 is provided with a receiving part 92 in a step shape, and the receiving part 92 is provided with a dustproof sleeve 93; thereby ensuring the operability of the reduction gear set 55 and the belt continuously variable transmission system 56.

The 7 th effect of the present invention is that the connecting cover 9 is locked on the right box 52a of the transmission part 52, and the connecting cover 9 is provided with connecting end surfaces 9a, 9b for connection towards the upper and lower sides of the right box 52 a; thereby, the connection between the connection cover 9 and the transmission part 52 is facilitated.

The 8 th effect of the present invention is that a leak-proof gasket 94 is disposed at the connection position of the connection end surfaces 9a, 9b and the outer edge of the right box 52 a; therefore, on one hand, the manufacturing tolerance of the connecting cover 9 and the right box 52a can be eliminated, on the other hand, the connection between the connecting end surfaces 9a and 9b and the outer edge of the right box 52a can have better anti-leakage effect, that is, external dust or moisture will not penetrate into the transmission part 52 from the connection between the connecting end surfaces 9a and 9b and the outer edge of the right box 52a, and further, the service effect and service life of each component in the transmission part 52 can be ensured.

The invention has the advantages that the connecting end surfaces 9a and 9b are vertical; therefore, on one hand, the manufacturing tolerance of the connecting cover 9 and the right box 52a can be eliminated, on the other hand, the connection between the connecting end surfaces 9a and 9b and the outer edge of the right box 52a can have better anti-leakage effect, that is, external dust or moisture will not penetrate into the transmission part 52 from the connection between the connecting end surfaces 9a and 9b and the outer edge of the right box 52a, and further, the service effect and service life of each component in the transmission part 52 can be ensured.

The 10 th effect of the present invention is that, since the anti-leakage gasket 94 is made of elastic material, the cross section of the anti-leakage gasket 94 is formed into a Z shape or T shape; therefore, on one hand, the manufacturing tolerance of the connecting cover 9 and the right box 52a can be eliminated, on the other hand, the connection between the connecting end surfaces 9a and 9b and the outer edge of the right box 52a can have better anti-leakage effect, that is, external dust or moisture will not penetrate into the transmission part 52 from the connection between the connecting end surfaces 9a and 9b and the outer edge of the right box 52a, and further, the service effect and service life of each component in the transmission part 52 can be ensured.

In summary, the present invention has been made to solve the above-mentioned problems and to achieve the purpose of the invention, and it is therefore an object of the present invention to provide a novel, practical and inventive element.