JPH11280623A - Power unit and wheel assembly - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] In a power unit and wheel assembly of a motorcycle or the like, the power unit is mounted in a well-balanced manner.
The strength of the casing, the simplification of the kick starter main shaft bearing structure and the improvement in durability are reduced, and the power unit is downsized. SOLUTION: In an assembly in which an axle 15 of wheels 14 is rotatably supported on a casing 13 of a power unit 1,
The casing includes a partition 16 which partitions the inside of the casing left and right in the vehicle width direction and through which the output shaft 4 of the internal combustion engine 2 penetrates, and which defines the width of the wheel tire 18 when viewed in the vehicle width direction. The rotary shaft group is located near the plane F on the power unit side in the plane, and the rotating shaft groups are arranged parallel to each other in the vehicle width direction, and are arranged side by side in the vehicle front-rear direction. The transmission is performed by gear engagement near the partition. The main shaft 61 of the kick starter 8 is arranged coaxially with the wheel axle. The gear transmission 3 has a main shaft 5 and a drive shaft 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly of a power unit and a wheel used for a small vehicle such as a motorcycle, and more particularly, to an assembly including an internal combustion engine, a gear transmission, a clutch, a kick starter and the like. In an assembly of a power unit and a wheel, in which a wheel axle is rotatably supported on a casing of the power unit, the power unit is attached in a well-balanced manner to improve the strength of the casing, and the structure of a bearing of a main shaft of a kick starter is improved. Simplify and improve its durability,
The present invention also relates to a power unit and a wheel assembly in which the size of the power unit is reduced.

[0002]

2. Description of the Related Art A power unit and a wheel assembly used for a small vehicle such as a motorcycle, the power unit including an internal combustion engine, a gear transmission, a clutch, a kick starter and the like. A power unit and a wheel assembly in which the axle of the wheel is rotatably supported by the casing described above are conventionally known, and are described in, for example, JP-A-9-49475.

[0003] In this device, the power unit is arranged so as to substantially fit within the side projection plane of the wheel, so that the size of the power unit is reduced. However, in this case, the shaft of the hydrostatic continuously variable transmission extends long to the side of the wheels, the amount of protrusion of the power unit from the side of the wheels is large, and the power unit is mounted with good weight balance. Since there is no casing, the weight burden on the casing is large, and the strength cannot be sufficiently maintained. Also,
Therefore, it cannot be said that the power unit has been sufficiently reduced in size.

Further, since the main shaft of the kick starter is supported at both ends by the casing, the main shaft is arranged close to the axle of the wheel or the output shaft (crankshaft) of the internal combustion engine so as to be at a minimum distance between the axles. However, there is a limit to the size of the kick starter, and thus the size of the power unit cannot be sufficiently reduced.

Although there is a kick starter in which the main shaft is arranged coaxially with the axle of the wheel (see Japanese Patent Publication No. Sho 62-48061), the kick starter is arranged such that the power unit fits substantially within the lateral projection plane of the wheel. Not related to the assembled power unit and wheel assembly, one end of the main shaft of the kick starter and one end of the wheel axle are cantilevered to the casing, respectively, and their other ends can rotate relative to each other Since it is only supported by a proper fit, the load of the axle of the wheel is applied to the main shaft of the kick starter, and it is difficult to improve the durability of the bearing portion of the main shaft of the kick starter.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, mounts the power unit in a well-balanced manner, reduces the weight burden on the casing, improves the strength, and improves the strength of the bearing of the main shaft of the kick starter. It is an object of the present invention to provide a power unit and wheel assembly capable of simplifying the structure and improving the durability thereof, and at the same time, reducing the size of the kick starter and the size of the power unit.

[0007]

The present invention relates to an assembly of a power unit and a wheel which solves the above-mentioned problems, and the invention described in claim 1 has at least an internal combustion engine, In a power unit and a wheel assembly in which a wheel axle is rotatably supported on a casing of a power unit including a gear transmission and a clutch, the casing partitions the inside of the casing into left and right in the vehicle width direction, And a partition wall through which an output shaft of the internal combustion engine passes. The partition wall is located near a plane on the power unit side among two planes that determine the width of the tire of the wheel when viewed in the vehicle width direction. The output shaft of the internal combustion engine, the plurality of gear shafts of the gear transmission, and a group of rotating shafts such as the axles of the wheels are mutually flattened in the vehicle width direction. And a power unit, which is arranged side by side in the vehicle front-rear direction, wherein power transmission between the rotating shafts in the rotating shaft group is performed by gear engagement in the vicinity of the partition. It is an assembly of wheels.

According to the first aspect of the present invention, since the partition wall that partitions the inside of the casing to the left and right is provided on one of the two surfaces defining the tire width of the wheel, the power unit side. The power transmission between the rotating shafts in the rotating shaft group is formed so as to be located near the surface,
In the vicinity of the partition, this is done by gear engagement.

[0009] As a result, the components of the power unit can be collectively arranged on the wheel side, so that the power unit does not protrude greatly from the side of the wheel and is mounted, and the power unit is not mounted. The whole can be attached with good weight balance, the weight burden of the casing is reduced,
Its strength can be maintained sufficiently. In addition, this makes it possible to reduce the size of the power unit.

Further, the invention described in claim 2 is:
In a power unit and a wheel assembly in which an axle of a wheel is rotatably supported on a casing of a power unit including an internal combustion engine, a gear transmission, a clutch, and a kick starter, the casing is provided inside the casing. Partitioning the vehicle width direction left and right, and comprises a partition through which the output shaft of the internal combustion engine penetrates, the axle of the wheel,
A gear portion for inputting the output of the gear transmission is provided at one end thereof, a portion serving as a shaft portion of the gear portion is provided on the partition wall, and the other end is provided on one side wall of the casing.
Each of the main shafts of the kick starter is supported coaxially with the axle of the wheel, and one end thereof is supported on the other side wall of the casing, and the other end is supported on one end of the axle of the wheel. And a power unit and a wheel assembly.

[0011] The invention described in claim 2 is configured as described above, so that the main shaft of the kick starter is disposed coaxially with the axle of the wheels. As a result, the space for disposing the kick starter is saved, and the size of the kick starter can be reduced, and the size of the power unit can be reduced.

The axle of the wheel is supported at one end by a partition wall of the casing, and the other end is supported by one side wall of the casing. The main shaft of the kick starter has one end at the other side wall of the casing. And also
The other end is supported on one end of the wheel axle.
This simplifies the structure of the bearing of the main shaft of the kick starter, reduces the load on the axle of the wheel applied to the main shaft of the kick starter, and improves the durability of the bearing of the main shaft of the kick starter. .

Further, the axle of the wheel is provided with a gear portion at one end for inputting an output of the gear transmission, and the other end of the main shaft of the kick starter is supported at a portion of the gear portion serving as the shaft portion. Therefore, it is possible to save space in the bearing portion on the other end side of the main shaft of the kick starter, and to further reduce the size of the kick starter and the power unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claims 1 and 2 of the present application shown in FIGS. 1 to 4 will be described below. FIG. 1 is a partial schematic left side view of a rear wheel side of a motorcycle to which an assembly of a power unit and wheels according to the present embodiment is applied, and FIG.
FIGS. 3 and 4 are longitudinal plan views cut along the line I-II.
FIG. 3 is a partially enlarged view of FIG.

1 and 2, a power unit 1 according to the present embodiment includes an internal combustion engine 2, a gear transmission 3, a crankshaft 4 which is an output shaft of the internal combustion engine 2, and a main shaft (an internal combustion engine) of the gear transmission 3. A centrifugal clutch 6 and a change clutch 7, a kick starter 8, and a transmission mechanism 70 that changes the gear ratio of the gear transmission 3 to change the transmission ratio. Have.

The gear transmission 3, the transmission mechanism 70 of the gear transmission 3, the centrifugal clutch 6, the change clutch 7, the transmission mechanism 60 of the kick starter 8, the drive gear portion 11 of the valve mechanism in the internal combustion engine 2, and the cooling water pump Accessories such as 12 are housed in a casing 13 formed integrally with the internal combustion engine 2,
The axle 15 of the wheel 14 is rotatably supported by the casing 13 in a manner described later.

The casing 13 comprises a left side wall portion 13a, a right side wall portion 13b and a central wall portion 13c provided with a partition wall (partition wall) 16 which will be described later in FIG. The respective wall portions are joined at the positions of the split planes XX and YY and are assembled as a single unit, and substantially the entirety thereof is accommodated in the side projection plane of the rim member (spoke) 17 of the wheel 14. In addition, substantially the entire power unit 1 including the internal combustion engine 2 is accommodated in the side projection plane of the wheel 14, and the overhang portion is reduced as much as possible, so that the power unit 1 is made compact. ing.
The partition wall 16 is located near the plane F on the power unit 1 side of the two planes that determine the width of the tire 18 of the wheel 14 when viewed in the vehicle width direction.

The internal combustion engine 2 is a four-stroke internal combustion engine, in which a cylinder block 19 and a cylinder head 20 project forward from the front end of the casing 13 to the front of the vehicle, and are slightly inclined upward. Has been placed. The front end of the power unit 1 is integrally connected to the pivot bearing portion 21 and is rotatably supported by a pivot shaft (not shown) at the pivot bearing portion 21. As a result, the entire power unit 1 serves as a rear fork. Functioning, the power unit 1 is configured as a swing unit.

The crankcase 22 of the internal combustion engine 2 is formed integrally with the casing 13, and its left wall in FIG.
22a is a part of the left side wall 13a of the casing 13, and the right side wall 22b of the crankcase 22 is a casing A in which the internal combustion engine 2 and the gear transmission 3 are accommodated. It forms a part of a partition wall 16 that partitions into a chamber B in which the centrifugal clutch 6 and the change clutch 7 are accommodated. Then, by forming the crankcase 22 integrally with the casing 13 in this manner, the casing 13 is formed integrally with the internal combustion engine 2.

The crankshaft 4 of the internal combustion engine 2 penetrates the crankcase 22 to the left and right, and is rotatably supported by ball bearings 23 and 24. On the left side, an electric power including a starter and a generator is provided. The system 10 is connected, and a clutch inner 6a of the centrifugal clutch 6 is connected to the right thereof,
Its right end is mounted on the right side wall 13b of the casing 13 with a ball bearing.
It is rotatably supported via 25. 26 is a piston of the internal combustion engine 2, and 27 is the connecting rod.

The clutch outer 6b of the centrifugal clutch 6
Primary reduction shaft concentric with crankshaft 4 (drive side)
A ratchet 29 is interposed between the clutch inner 6a and the clutch outer 6b, and the centrifugal clutch 6 is configured as a one-way clutch.

A primary reduction gear (drive side) 30 is formed integrally with an end of the primary reduction shaft (drive side) 28. The primary reduction gear (drive side) 30 A primary reduction gear (driven side) 31 integral with the outer 7b is engaged. The clutch inner 7 a of the change clutch 7 is integrally connected to the main shaft 5 of the gear transmission 3.

The gear transmission 3 is located below the crank chamber 32 of the internal combustion engine 2 in FIG. 2 (upper right in FIG. 1 or upper oblique rear of the vehicle), and is located on the left side in the casing 13 partitioned by the partition wall 16. In a room 33.

The main shaft 5 of the gear transmission 3 has one end rotatably supported on the left side wall 13a of the casing 13 via a ball bearing 34 and the other end rotatably supported on the partition wall 16 via a ball bearing 35. The clutch inner 7a of the change clutch 7 is integrally connected to the other end as described above.

The drive shaft 36 of the gear transmission 3 is
One end is rotatably supported on the left side wall 13a of the casing 13 via a ball bearing 37, and the other end is rotatably supported on the partition wall 16 via a ball bearing.

Therefore, now, the rotation speed of the internal combustion engine 2 is increased, the centrifugal clutch 6 is connected, the primary reduction gear (drive side) 30 and the primary reduction gear (driven side) 31 are engaged, and By operation, the clutch outer 7b and the clutch inner 7a are pressed against each other and the change clutch 7
Is connected, the output of the internal combustion engine 2 is input to the gear transmission 3 through the main shaft 5, and within the gear transmission 3, a predetermined gear of a group of gears fitted to the main shaft 5 is connected. The output gear 39 formed at one end of the drive shaft 36 is shifted at a predetermined speed ratio by meshing with a predetermined gear of a group of gears fitted to the drive shaft 36, and the axle 15 of the wheel 14 Is engaged with an input gear 40 fitted to one end of the
Fourteen rotational drives are made.

The axle 15 of the wheel 14 extends across the interior of the chamber B, and a shaft portion (wheel 14 side) 15a of a gear portion on one end of which the input gear 40 is fitted is formed by a partition wall. 16 is rotatably supported via a ball bearing 41, and the other end is rotatably supported via a ball bearing 42 on the right side wall 13 b of the casing 13. A seal packing 43 is further provided at a portion where the axle 15 passes through the right side wall 13b.

In the center of the wheel 14, a brake drum surrounding the axle 15 and supported by spokes 17 and having a substantially U-shaped cross section is provided.
44 is formed, and an annular space C of the brake drum 44 is formed.
Inside, a brake device 45 is housed.

A brake panel 46 for covering the opening on the power unit 1 side of the brake drum 44 is formed integrally with the right side wall 13b of the casing 13. The majority of the axle 15 including the bearing at the other end is connected to the right side wall 13b. Also used as part of 13b. Therefore, the brake drum 44 is relatively rotatably covered by the brake panel 46 integral with the right side wall 13b of the casing 13.

The brake device 45 has a known structure. When a cable (not shown) is pulled by a manual operation, a lever connected to an end of the cable is pulled, and the lever rotates the cam shaft 47. Then, the shoe 48 of the brake device 45 is pressed against the inner peripheral surface of the brake drum 44 to operate the brake.

The brake drum 44 is provided with the change clutch 7
Since the release adjustment mechanism 50 is not covered from the side of the vehicle, a tool is inserted from the gap between the plurality of spokes 17 of the wheel 14 to rotate the adjustment bolt 51 from the outside when adjusting the release of the change clutch 7. It is not necessary to remove the wheel 14 in particular.

Here, the release adjusting mechanism 50 of the change clutch 7 is configured as follows. Adjustment bolt 51
The large-diameter disc 52a and the small-diameter cylinder 52b
An adjustment member 52 is screwed in such a way that it cannot rotate relative to each other, and a roller 53 having an axis directed in a radial direction as a rotation center is attached to a plurality of locations on the outer peripheral portion of the large-diameter disc portion 52a. I have.

The small-diameter cylindrical portion 52b is covered with a dish-plate-like cam body 54, and cams which engage with the rollers 53 are provided at a plurality of positions on the outer periphery of the dish-like cam body 54. 54a is formed. Also, the center dish bottom portion 54 of the dish plate cam body 54 is provided.
b is relatively rotatably engaged with the pressure plate 56 of the clutch inner 7a of the change clutch 7 via the ball bearing 55.

Therefore, when a cable or link (not shown) connected to the plate-like cam body 54 is pulled,
Since the plate-like cam member 54 rotates and the cam 54a rides on the roller 53, the plate-like cam member 54 is adjusted while being guided by the outer peripheral surface of the small-diameter cylindrical portion 52b of the adjusting member 52. The direction away from the member 52, that is, the pressure plate 56
, The clutch plate 7c of the clutch inner 7a is pressed against the friction plate 7d of the clutch outer 7b, and the change clutch 7 is connected.

When the clutch plate 7c and the friction plate 7d are worn and slippage occurs in the change clutch 7 and it is necessary to adjust them, the adjusting bolt
Loosen the lock nut 57 of 51, and rotate the adjustment bolt 51 by an appropriate amount from the side of the vehicle. As a result, the adjustment member 52 screwed to the adjustment bolt 51 so as to be relatively non-rotatable advances in the axial direction, and strongly presses the plate-like cam body 54 to the pressure plate 56 via the ball bearing 55. 7
Slippage is eliminated.

When the rim member 17 of the wheel 14 is formed of a cup-shaped panel, if a suitable number of openings are formed at locations facing the release adjusting mechanism 50, a change clutch is formed in the same manner as described above. 7 release adjustments can be made.

It should be noted that even if a small diameter change clutch 7 is used and it is arranged close to the axle 15 of the wheels 14 so as to be at a minimum distance between the axles 15, the release adjustment mechanism 50 can be used for the brake drum 44. By arranging the change clutch 7 at a position where is not covered, the release adjustment can be performed without any trouble as described above.

The transmission mechanism 60 of the kick starter 8 is configured as follows. As shown in FIGS. 2 and 4, the main shaft (spindle) 61 of the kick starter 8 is
It is arranged coaxially with the axle 15 of the wheel 14, one end of which is
The casing 13 penetrates and is supported by the left side wall 13a, and the other end thereof is abutted against one end of an axle 15 of the wheel 14, and is rotatably fitted and supported therein. A seal packing 62 is provided at a portion where the main shaft 61 passes through the left side wall 13a.

A kick starter gear (drive side) 63 is fitted to the main shaft 61 so as to be relatively rotatable.
64 is screwed so as to be movable in the axial direction. The kick ratchet 64 is urged in one direction by a spring 65 so as not to rotate with the rotation of the main shaft 61. 66 is the main shaft
A coil spring that constantly biases 61 to the initial position of the kick starter 8.

On the right side of the kick starter gear (drive side) 63 in FIG. 4, there are formed crown gear-shaped fitting teeth 63a. Also, on the left side surface of the kick ratchet 64 in FIG. 4, a crown gear-shaped fitting tooth 64a that meshes with the fitting tooth 63a of the kick starter gear (drive side) 63 is formed.

Accordingly, the kick pedal 67 of the kick starter 8 is now depressed, and the main shaft 61 is moved by the coil spring 66.
4, the kick ratchet 64 screwed to the main shaft 61 moves to the left in the axial direction in FIG. 4, and the fitting teeth 64 a of the kick ratchet 64 engage with the kick starter gear (drive side) 63. It meshes with the denture 63a. As a result, the kick starter gear (drive side) 63 rotates together with the kick ratchet 64.

On the other hand, kick starter gear (drive side)
63 is rotatably fitted to the drive shaft 36 of the gear transmission 3 and meshes with a gear 68 functioning as an idle gear at the time of starting. The gear 68 is the left end of the main shaft 5 of the gear transmission 3 in FIG. The gear shaft 69 is formed integrally with the main shaft 5 and meshes with a gear 69 functioning as a kick starter gear (driven side) at the time of starting.
The rotational force of 61 is transmitted to the change clutch 7 in which the clutch inner 7a is connected to the other end of the main shaft 5 via the meshing of these gears and the main shaft 5.

The torque of the main shaft 61 transmitted to the change clutch 7 is further reduced therefrom by a primary reduction gear (driven side).
Through the engagement of the primary reduction gear (drive side) 30 with the primary reduction gear 30, the centrifugal clutch 6 configured as a one-way clutch,
The power is transmitted to the crankshaft 4 of the internal combustion engine 2 to start the internal combustion engine 2.

As described above, the main shaft 61 of the kick starter 8 is arranged coaxially with the axle 15 of the wheel 14, so that the space for arranging the kick starter 8 can be reduced as compared with the case where it is arranged at a different position. Therefore, the kick starter 8 can be downsized, and the power unit 1 can be downsized.

The other end of the main shaft 61 of the kick starter 8 is fitted and supported on one end of the axle 15 of the wheel 14. The axle 15 is supported by the partition wall 16 and the right side wall 13b of the casing 13. Since it is supported, the fitting support at the other end of the main shaft 61 is strong, and the structure of the bearings at both ends of the main shaft 61 is simplified. Further, the load on the axle 15 applied to the main shaft 61 is reduced, and the durability of the bearing portion of the main shaft 61 can be improved.

As is clear from the above description, the rotating shaft groups such as the crankshaft 4 of the internal combustion engine 2, the main shaft 5 and the drive shaft 36 of the gear transmission 3, the axle 15 of the wheels 14, the main shaft 61 of the kick starter 8, etc. Are arranged parallel to each other in the vehicle width direction, and are arranged side by side in the vehicle front-rear direction (however, the main shaft 61 of the kick starter 8 and the wheels).
The 14 axles 15 are arranged coaxially. ).

The power transmission between the rotating shafts in the rotating shaft group is performed by gear engagement in the vicinity of the partition wall 16 of the casing 13. With the arrangement of the rotating shaft group and the configuration of the power transmission mechanism, the components of the power unit 1 can be collectively arranged on the wheel 14 side.

The transmission mechanism 70 of the gear transmission 3 is constructed as follows. When the gear shift switch is switched by a driver's manual operation, a motor (not shown) is rotated to rotate the spindle 72 via the reduction gear group 71 in FIG. Then, the lever 73 integrally connected to the spindle 72 rotates, and the plate-like cam body 54 of the change clutch 7 linked to the lever 73 rotates to cut off the change clutch 7. Lever 7
4. The lever 75 rotates to rotate the petal-shaped rotor 76 integrally connected to the shift drum (not shown) by one frame.

As a result, the shift drum rotates by one frame of the petal-shaped rotor 76, and a shift fork (not shown) moves along a cam groove formed in the shift drum. Is changed to the next stage. Thus, the output of the internal combustion engine 2 is shifted. 77 is a regulating lever for regulating the amount of rotation of the spindle 72, and 78 is a regulating claw for rotating the petal-shaped rotor 76 frame by frame.

Since the assembly of the power unit 1 and the wheels 14 in the present embodiment is configured as described above, the following effects can be further obtained. The partition wall 16 that partitions the inside of the casing 13 left and right is located near a plane F on the power unit 1 side, which is one of two planes that determine the width of the tire 18 of the wheel 14. The rotating shaft group 4, which is oriented parallel to each other in the vehicle width direction and arranged in the vehicle longitudinal direction,
The power transmission between the rotating shafts at 5, 36, 61 and 15 is performed by gear engagement in the vicinity of the partition wall 16.

As a result, the components of the power unit 1 can be arranged collectively on the wheel 14 side, so that the power unit 1 does not protrude greatly from the side of the wheel 14. As a result, the entire power unit 1 can be mounted with good weight balance, and the weight burden on the casing 13 is reduced, and the strength of the casing 13 can be sufficiently maintained. This also allows the power unit 1 to be downsized.

Further, the axle 15 of the wheel 14 has a shaft portion (wheel 14 side) 15 a of the gear portion to which the input gear 40 is fitted at one end thereof, which is supported by the partition wall 16 of the casing 13. The bearing at one end is
Need not be extended outwardly, the space for the bearing portion can be saved, and the kick starter 8 and the power unit 1 can be further reduced in size.

[Brief description of the drawings]

FIG. 1 is a partial schematic left side view of a rear wheel side of a motorcycle to which an assembly of a power unit and wheels according to an embodiment of the invention described in claims 1 and 2 of the present application is applied.

FIG. 2 is a vertical cross-sectional view taken along line II-II of FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is another partially enlarged view of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power unit, 2 ... Internal combustion engine, 3 ... Gear transmission, 4 ... Crankshaft, 5 ... Main shaft, 6 ...
Centrifugal clutch, 6a: clutch inner, 6b: clutch outer, 7: change clutch, 7a: clutch inner, 7b: clutch outer, 7c: clutch plate,
7d: friction plate, 8: kick starter, 10
... Electrical system, 11 ... Drive gear part (valve operating mechanism), 12 ... Cooling water pump, 13 ... Casing, 13a ... Left side wall (left side wall part), 13b ... Right side wall (right side wall part), 13c ... Center wall part, 14 ... Wheel, 15 ... Axle, 15a ... Shaft part, 16 ... Partition wall (partition), 17 ... Rim member (spoke), 18 ... Tire, 19
... Cylinder block, 20 ... Cylinder head, 21 ... Pivot bearing, 22 ... Crankcase, 22a ... Left wall, 22b ...
Right wall, 23-25… Ball bearing, 26… Piston, 27… Connecting rod, 28… Primary reduction shaft (drive side), 29
… Ratchet, 30… Primary reduction gear (drive side), 31…
Primary reduction gear (driven side), 32 ... crank chamber, 33 ...
Chamber, 34, 35… Ball bearing, 36… Drive shaft, 37,
38: ball bearing, 39: output gear, 40: input gear, 41, 42
... Ball bearing, 43 ... Seal packing, 44 ... Brake drum, 45 ... Brake device, 46 ... Brake panel, 47 ... Cam shaft, 48 ... Shoe, 49 ..., 50 ... Release adjustment mechanism, 51 ... Adjustment bolt, 52 ... Adjustment Member, 52a: Large-diameter disc, 52b: Small-diameter cylinder, 53: Roller, 54: Dish plate cam, 54a: Cam, 54b: Central dish bottom, 55: Ball bearing, 56: Pressure plate, 57 ... lock nut, 60 ... starting transmission mechanism, 61 ... spindle (spindle), 62 ... seal packing, 63
… Kick starter gear (drive side), 63a… Mating teeth,
64… Kick ratchet, 64a… Mating teeth, 65… Spring, 66…
Coil spring, 67: kick pedal, 68: gear (idle gear), 69: gear (kick starter gear (driven side)), 70: transmission mechanism, 71: reduction gear stage, 72: spindle, 73-75: lever, 76: petal-shaped rotor, 77: regulating lever, 78: regulating claw, A, B: chamber, C: annular space, F: plane.

Claims (2)

[Claims] 1. A power unit and a wheel assembly in which a wheel axle is rotatably supported on a casing of a power unit including at least an internal combustion engine, a gear transmission, and a clutch, wherein the casing comprises a casing. A partition partitioning left and right in the vehicle width direction, and a partition through which an output shaft of the internal combustion engine penetrates, wherein the partition is, when viewed in the vehicle width direction, one of two planes that define the width of the tire of the wheel. The output shaft of the internal combustion engine, the plurality of gear shafts of the gear transmission, and a group of rotating shafts such as the axle of the wheel are directed to each other in the vehicle width direction. The power transmission between the rotating shafts in the rotating shaft group is performed by gear engagement in the vicinity of the partition wall. The assembly of the power unit and the wheel, characterized in that the. 2. An assembly of a power unit and a wheel, wherein an axle of a wheel is rotatably supported on a casing of a power unit including an internal combustion engine, a gear transmission, a clutch, and a kick starter. A partition partitioning the inside of the casing into left and right in the vehicle width direction, and a partition through which an output shaft of the internal combustion engine passes. A portion serving as a shaft portion of the gear portion is supported by the partition wall, and the other end is supported by one side wall of the casing. A main shaft of the kick starter is disposed coaxially with an axle of the wheel. , One end of which is on the other side wall of the casing,
A power unit and a wheel assembly, wherein the other end is supported by one end of the axle of the wheel.