JPH06199267A - Power transmitting device to front wheel of front/rear driving motorcycle - Google Patents

Abstract

PURPOSE:To hinder the power from a drive motive from being transmitted to the front wheels while it is not required to remove the drive chain from a drive sprocket. CONSTITUTION:A clutch part 48 consists of a clutch 66 which transmits or shuts off the power from a drive motive in a part between a wheel hub 44 and a sprocket 46, a slider cam 70 to slide the clutch 66 for engagement upon a front shaft 58 between the hub 44 and sprocket 46 while a guide spline spacer 68 is interposed, and a cam lever 72 which is to operate this slider cam 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a front wheel of a front and rear wheel drive motorcycle.

[0002]

2. Description of the Related Art Conventionally, the rotation of the front wheels of a front and rear wheel drive two-wheeled vehicle has been integrated with a front wheel on which tires are mounted by motive power from a drive source, as disclosed in JP-A-3-31088. It was done by transmitting to the sprocket via a drive chain. For this reason, for some reason, if you do not want to transmit power to the front wheels, you must use a tool such as a screwdriver to disconnect the drive chain from the sprocket that connects to the drive chain. Also, if the front wheels are interlocked with the drive chain, the front wheels will be loaded as much as they are interlocked with the drive chain when pushing and walking the motorcycle, so the handling of the steering wheel will be heavy. there were.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and the problem to be solved is to freely connect and disconnect the power from the drive source to the front wheels. SUMMARY OF THE INVENTION It is an object of the present invention to provide a power transmission device for front wheels of a front and rear wheel drive two-wheeled vehicle, which can prevent the power from a drive source from being transmitted to the front wheels without removing a drive chain from a sprocket.

[0004]

The power transmission device for the front wheels of the front and rear wheel drive motorcycle according to the present invention solves the above problems and is as follows. That is, the power transmission device for the front wheels of the front and rear wheel drive motorcycle according to the present invention transmits the power from the drive source to the wheel hub portion fixed to the front wheel rim and rotating with respect to the front shaft. To this end, the sprocket portion rotates with respect to the front shaft, and the clutch portion interposed between the sprocket portion and the wheel hub portion. The clutch portion operates a clutch that disconnects and connects the wheel hub portion and the sprocket portion to cut off and transmit the power between the sprocket portion and the wheel hub portion. Therefore, the clutch is composed of a slider cam that slides on the front shaft between the wheel hub portion and the sprocket portion via a guide spline spacer, and a cam lever that operates the slider cam.

Further, the cam lever may be provided with a pair of levers which are formed in line symmetry with respect to the front shaft and rotate about the front shaft. Then, operation wires are attached to the pair of levers, respectively, and the operation wires include a support member arranged between the cam lever operation portion provided in the steering operation portion of the motorcycle and the pair of levers. It is attached to the vehicle body via.

Further, the guide spline spacer has a claw piece that is coaxial with the front shaft and is formed at the end opposite to the wheel hub portion of the guide spline spacer so as to project from the sprocket portion. A fixing bracket for fixing the guide spline spacer to the front swing arm that rotates with respect to the front fork is attached to the claw piece. Then, the fixing bracket is fitted and fixed in the recess formed in the front swing arm.

[0007]

According to the power transmission device for the front wheels of the front-rear-wheel-drive two-wheeled vehicle of the first aspect of the present invention, the clutch portion cuts off and transmits the power from the drive source between the wheel hub portion and the sprocket portion. A clutch for connecting and disconnecting the wheel hub portion and the sprocket portion, and for operating the clutch, the clutch is provided on the front shaft between the wheel hub portion and the sprocket portion via a guide spline spacer. It consists of a slider cam that slides and a cam lever that operates this slider cam.When the cam lever is operated, the clutch operates between the wheel hub and sprocket parts via the slider cam and the guide spline spacer, and the wheel hub and sprocket parts Intermittent connection with.

According to the second aspect of the present invention, there is provided a power transmission device for front and rear wheels of a front-rear-wheel-drive two-wheel vehicle, wherein the cam lever is formed line-symmetrically with respect to the front shaft and rotates about the front shaft. A pair of levers are provided, and operation wires are attached to the pair of levers, and these operation wires are arranged between the cam lever operation part provided in the steering operation part of the motorcycle and the pair of levers. Since it is attached to the vehicle body via the support member, when the cam lever operating portion is operated, the operation wire rotates the pair of levers in the clockwise direction or the counterclockwise direction about the shaft as the rotation center via the support member material. .

According to another aspect of the present invention, there is provided a power transmission device for front and rear wheels of a front-rear-wheel-drive two-wheeled vehicle, wherein the guide spline spacer is coaxial with the front shaft and has a claw protruding from a sprocket part at an end opposite to the wheel hub part. A piece is formed, and a fixing bracket for fixing the guide spline spacer to the front swing arm that rotates with respect to the front fork is attached to the claw piece, and the fixing bracket is formed on the front swing arm. Since it is fitted and fixed in the recess, the front wheel can be attached to the front swing arm simply by pushing the fixing bracket into the recess of the front fork.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An exhaust system for a multi-cylinder engine of a motorcycle according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an overall side view showing a state in which a power transmission device for front and rear wheels of a front and rear wheel drive motorcycle is mounted on a motorcycle, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a power transmission device for front wheels of a front and rear wheel drive two wheel vehicle. FIG. 4 is an enlarged cross-sectional view showing a state in which a clutch is engaged, FIG. 4 is a diagram showing a state in which the clutch is disengaged in FIG. 3, and FIG. 5 is an enlarged main part of a power transmission device to front wheels of a front-rear wheel-drive two-wheeled vehicle. FIG. 6 is a side view, FIG. 6 is a partially cutaway enlarged perspective view of FIG. 5, FIG. 7 is an enlarged exploded perspective view of an essential part showing a front wheel attached state to a front swing arm, and FIG. 8 is a diagram showing a modified example of a cam lever operating portion. is there.

The front and rear wheel drive motorcycle 2 has a frame 4 as a skeleton. And in the front part of the frame 4,
A steering wheel 6 as a steering operation section and a front fork 8 which rotates left and right by the steering wheel operation are attached, and a front wheel 9 is rotatably attached to the front fork 8 via a cushion unit 10. A rear wheel 16 is rotatably attached to the swing arm 14 via the cushion unit 10 at the rear portion of the frame 4.

The front and rear wheels 9 and 16 are driven by one engine 18, which is a drive source. That is, the front wheels 9 are the unillustrated V-belt transmission, gear reducer, front chain 20, constant velocity universal joint 22, primary chain 26 rotatably hung on both ends of the left fork 8l of the front fork 8-left. Lower end of fork 8l and front wheel 9
A left front swing arm 28l that is a part of the front fork 8 that is bridged between
Is driven by the front wheel drive output section 18a via an idler 30 and a front driven sprocket 32, which are rotatably hung on both ends of the rear wheel 16, respectively, and the rear wheel 16 is for rear wheel drive. It is driven by the output part 18b via the rear chain 36.

The front wheel 9 comprises a tire 38 and a front wheel 40. The front wheel 40 includes a front wheel rim portion 41, a wheel hub portion 42, a sprocket portion 46, and a clutch portion 48.

The front wheel rim portion 41 includes the tire 5
It is composed of an outer peripheral portion 43 to which 0 is mounted, and a spoke 52 connecting the outer peripheral portion 43 and the wheel hub portion 42 to each other. The wheel hub portion 42 at the center of the front wheel 40 includes a driven hub body 44 and a driven spline 45 located on the sprocket portion 46 side of the driven hub body 44, and is fixed to the spokes 52 by screwing means 54. The wheel hub portion 42 includes a bearing 56a provided on the driven hub body 44.
It rotates on a front shaft 58 fixed via a bridge 56a between the left front swing arm 28l and the right front swing arm 28r.

The driven spline 45 has a flange portion 4
5a, a spline portion 45b, and a protruding portion 45c, and the flange portion 45a is fixed to the side surface 44a of the sprocket portion 46 of the driven hub body 44 by screwing means 54, 54, ..., thereby being integrated with the driven hub body 44. The spline portion 45b is for operating a clutch of the clutch portion 48, which will be described later, and is a portion for sliding the clutch in the axial direction of the front shaft 58. The protrusion 45c is for inserting an oil seal 47 between the protrusion 45c and a spline portion of the sprocket portion 46 described later.

In the sprocket portion 46, the front driven sprocket 32, the drive hub body 61, and the drive spline 62 are integrated on the same axis by screwing means 64, 64, ..., With the front shaft 58 as the center of rotation. It is a thing. A sprocket tooth 32a of the front driven sprocket 32 is provided with a secondary chain 34 that transmits power from a drive source. The drive hub body 61 is provided with a bearing 56b, and the sprocket portion 46 rotates on the front shaft 58 together with the clutch portion 48 via the bearing 56b and a bearing 56c of the clutch portion 48 described later.

[0017] The drive spline 62, the flange portion 6
2a and a spline portion 62b, and a flange portion 62
a is fixed to the hub side surface 61a of the drive hub body 61 by screwing means 64. Spline part 62b
Is a portion for operating the clutch of the clutch portion 48 and is a portion for sliding the clutch 48 in the axial direction of the front shaft 58. The spline portion 62 b and the spline portion 45 b of the driven spline 45 are the wheel hub portion 42 and the sprocket portion 4.
When 6 and 6 are installed on the front shaft 58, the clutch slides and forms a spline path 65 interrupted at the boundary between the spline portion 62b and the spline portion 45b.

The clutch portion 48 includes a clutch 66 for connecting / disconnecting the power from the engine 18 to and from the connection between the wheel hub portion 42 and the sprocket portion 46, and a clutch 66 for operating the clutch 66, the wheel hub portion 42 and the sprocket portion 46. A slider cam 70 that slides on the front shaft 58 via a guide spline spacer 68 and a cam lever 72 that operates the slider cam 70 between them.

The clutch 66 is a clutch spline 74.
And a bearing 56c and a bearing retainer nut 78 which are provided between the slider spline 76, the clutch spline 74 and the slider spline 76.

The clutch spline 74 is spline-coupled with the spline portion 62b of the drive spline 62, and the driven spline 45 of the wheel hub portion 42 is also included.
The spline portion 45b is also spline-coupled. As a result, the clutch spline 74 is replaced by the spline portion 45b.
And the spline portion 62b is slid in the axial direction of the front shaft 58. In addition,
The spline path 65 is interrupted as described above, and the clutch 66 is slid and moved to the interrupted portion 65a so that the clutch 66 is engaged, and the clutch 66 separates from the interrupted portion 65a. 66 is cut off.

The slider spline 76 has a substantially hollow cylindrical shape. A flange 76a for sandwiching the bearing 56c between the bearing 56c and the bearing retainer nut 78 is formed near the center thereof, and the inner peripheral surface extending from the flange 76a to the wheel hub portion side end 76b is A spline portion 77 is formed for slider connection with a later-described spline portion of the guide spline spacer 68. In addition, the flange 76a and the slider spline 76
In a portion of the slider cam 70 between the sprocket portion 46 and the end 76c thereof, grooves of the slider cam 70, which will be described later, are inserted, and grooves 80, 80 that slide with the pin are formed obliquely at a position displaced by 180 degrees. ing.

The guide spline spacer 68 is coaxial with the front shaft 58 and comprises a spline portion 69a and a cylindrical portion 69b. This spline portion 69a
The slider spline 76 is adapted to be spline-coupled with the spline portion 77. Then, as shown in FIG. 6, one or more claw pieces (two claw pieces are shown in this embodiment are projected from the front driven sprocket 32, which is a sprocket wheel, at the end 68a of the guide spline spacer 68 opposite to the wheel hub. Is formed). A block fixing bracket 84 for fixing the guide spline spacer 68 to the left front swing arm 28l that is a front swing arm that rotates with respect to the front fork 8 is attached to the claw piece 82.
Then, the fixing bracket 84 is fitted and fixed in the recess 86 formed in the front swing arm 28l.

The slider cam 70 comprises a rotating cylinder portion 88 which is rotated by the bearing 56b, and pins 90, 90 formed at the end portion 88a of the rotating cylinder portion 88 on the wheel hub portion 42 side.

The pins 90, 90 are formed at positions displaced by 180 degrees. The pins 90, 90 are inserted into the grooves 80, 80 of the slider spline 76, and the grooves 80, 90 are rotated as the slider cam 70 rotates. It slides in 80.

The cam lever 72 is for rotating and operating the slider cam 70.
It is formed at the end 88b of the wheel hub portion 42 opposite to zero. The cam lever 72 is composed of a pair of upper and lower upper levers 72a and a lower lever 72b formed at a position displaced by 180 degrees. Therefore, the slider cam 70
When you attach the to the front shaft 58, the vertical lever 72
The a and 72b are line-symmetric with respect to the front shaft 58. In addition, these levers 72a and 72b are respectively provided with an upper operation wire 92 for operating the upper lever 72a.
a and a lower operation wire 92b for operating the lower lever 72b
Is attached. These operation wires 92a.9
Reference numeral 2b denotes a handle 6 which is a steering operation portion of the front and rear wheel drive two-wheeled vehicle 2, a manual or electric cam lever operation portion 94 provided in the vicinity thereof, and a pair of levers 72a and 72a.
It is arranged between 2b. Then, the cam lever operation unit 9
4 and the levers 72a, 72b between the supporting members 96, 96
The support members 96, 96 are attached to the left front swing arm 28l.

The operation of the power transmission device for the front wheels of the front and rear wheel drive two-wheeled vehicle constructed as described above will now be described with reference to FIGS. A case will be described in which the lower operating wire 92b is pulled toward the rear wheel by operating the cam lever operating portion 94. The cam lever 72 rotates counterclockwise in FIG. Then, the pins 90 of the cam lever 72
Rotates in the counterclockwise direction, a rotational force in the counterclockwise direction is also applied to the grooves 80, 80 in which the pins 90, 90 are inserted. However, in the slider spline 76 in which the grooves 80 are formed, the spline portion 77 is
Since it is splined with the spline portion 69a of the guide spline spacer 68 that is not rotated by the fixing bracket 84, the pins 90, 90 do not rotate and the groove 8 does not rotate.
Slide 0.80 in the direction of arrow A in FIG. When a rotational force in the counterclockwise direction is applied to the slider spline 76 via the pin 90 / 90-groove 80/80, the slider spline 76 slides along the spline path 65 toward the hub. Then, the spline path 65
The clutch 66 is slid to the discontinued portion 65a and moves, whereby the clutch 66 is engaged. When the clutch 66 is engaged, the wheel hub portion 42 and the sprocket portion 46 are integrated with each other.
When the power from is transmitted to the front wheels 9, the power is transmitted to the front wheel rim portion 41 including the tire 38 via the sprocket portion 46-clutch portion 48-wheel hub portion 42 to rotate the front wheels 9. Let

On the other hand, the case where the upper operation wire 92a is pulled to the rear wheel side will be described. When the cam lever operating portion 94 is operated, the cam lever 72 rotates clockwise. Then, the pins 90, 90 of the cam lever 72 rotate clockwise, so that the pins 90, 90 also give a rotational force in the clockwise direction to the grooves 80, 80. However, as described above, the slider spline 76 having the grooves 80, 80 is formed.
6, the spline portion 77 is spline-coupled with the spline portion 69a of the guide spline spacer 68 that is not rotated by the fixing bracket 84. Therefore, the pins 90, 90 do not rotate, and the grooves 80, 80 are formed as shown in FIG. Arrow B
Slide in the direction. When a rotational force in the clockwise direction is applied to the slider spline 76 via the pin 90 / 90-groove 80/80, the slider spline 76 slides along the spline path 65 toward the side opposite to the hub. Then, when the clutch 66 is slid to a position where it does not reach the discontinuous portion 65a of the spline path 65, the clutch 66 is disengaged and the front wheels are prevented from rotating.

Therefore, when it is not desired to transmit the power from the drive source to the rear wheels, the connection and disconnection of the drive sprocket and the drive chain can be easily and quickly performed without using a tool, and the clutch portion 48 can be switched. Can be operated at hand. Further, the front wheel 9 can be attached to the front swing arm 28 only by pushing the fixing bracket 84 into the recess 81 a of the front swing arm 28 of the left fork 81. Therefore, even if the operator is not accustomed to working, the front wheels 9 can be easily and quickly assembled to the vehicle body. The cam lever operation part 9
When the motor 4 is electric, the motor 98 may be arranged at the position shown in FIG. 8, for example.

[0029]

According to the power transmission device for the front wheels of the front and rear wheel drive two-wheeled vehicle according to claim 1 of the present invention, the clutch portion cuts off and transmits the power from the drive source between the wheel hub and the sprocket. Cam lever for operating the clutch, a slider cam for sliding the clutch on the front shaft between the wheel hub and the sprocket for operating the clutch via a guide spline spacer, and a cam lever for operating the slider cam. When is operated, the clutch operates between the wheel hub and the sprocket via the slider cam and the guide spline spacer, and the connection between the wheel hub and the sprocket is interrupted. Therefore,
When it is not desired to transmit the power from the drive source to the rear wheels, the connection / disconnection of the drive sprocket and the drive chain can be easily and quickly performed without using a tool.

According to the power transmission device for the front wheels of the front and rear wheel drive motorcycle according to the second aspect of the present invention, the cam lever is
A pair of levers that are formed line-symmetrically about the front shaft and that rotate in the clockwise direction or counterclockwise direction about the front shaft as a center of rotation;
Operation wires are attached to the pair of levers, respectively, and these operation wires are interposed between a pair of levers and a cam lever operation section for operating a cam lever provided in a steering operation section of the motorcycle. Since it is attached, when the cam lever operating portion is operated, the operation wire rotates the pair of levers in the clockwise direction or the counterclockwise direction about the shaft as the rotation center via the support member. Therefore, for example, if the structure is such that the clutch is engaged in the clockwise direction and the clutch is disengaged in the counterclockwise direction, switching of the clutch can be operated at hand.

According to a third aspect of the present invention, there is provided a power transmission device for front wheels of a front-rear-wheel-drive two-wheeled vehicle, wherein the guide spline spacer is coaxial with the front shaft and is provided at the end opposite to the wheel hub from the sprocket wheel. A protruding claw piece is formed, and a fixed bracket for fixing the guide spline spacer is attached to the front swing arm that rotates with respect to the front fork, and the fixed bracket is formed on the front fork. The front wheel is attached to the front swing arm simply by pushing the fixing bracket into the recess of the front fork. Therefore, the front wheels can be easily and quickly assembled to the vehicle body even if they are not familiar with the work. can do.

[Brief description of drawings]

FIG. 1 is an overall side view showing a state in which a power transmission device for a front wheel of a front-and-rear-wheel drive motorcycle is mounted on the motorcycle.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged cross-sectional view of a power transmission device for the front wheels of a front-rear wheel-drive two-wheeled vehicle, showing a state in which a clutch is engaged.

FIG. 4 is a diagram showing a state in which a clutch is disengaged in FIG.

FIG. 5 is an enlarged side view of a main part of a power transmission device for front wheels of a front-rear wheel-drive two-wheeled vehicle.

6 is a partially cutaway enlarged perspective view of FIG.

FIG. 7 is an enlarged perspective view of a main part showing a mounting state of front wheels on a front swing arm.

FIG. 8 is a diagram showing another modification.

[Explanation of symbols] 6 Steering operation portion 8 Front fork 9 Front wheel 18 Drive source 28 Front swing arm 41 Front wheel rim portion 44 Wheel hub portion 46 Sprocket portion 48 Clutch portion 58 Front shaft 68 Guide spline spacer 68a Counter wheel hub side end 70 Slider cam 72 Cam levers 72a, 72b Pair of levers 82 Claw piece 86 Recessed portion 92a Operation wire 92b Operation wire 94 Cam lever operation portion 96 Support member

Claims (3)

[Claims] 1. A wheel hub portion fixed to a front wheel rim portion and rotating with respect to a front shaft, and a sprocket portion rotating with respect to the front shaft for transmitting power from a drive source to the wheel hub portion. A power transmission device for front wheels of a front-rear wheel-drive two-wheeled vehicle, comprising: a clutch portion interposed between the sprocket portion and the wheel hub portion, wherein the clutch portion transfers the power to the sprocket portion and the wheel. A clutch for connecting and disconnecting the wheel hub portion and the sprocket portion for disconnecting and transmitting between the hub portion, and a clutch for operating the clutch between the wheel hub portion and the sprocket portion. A slider cover that slides on the front shaft via a guide spline spacer. And a cam lever for operating the slider cam. A power transmission device for front wheels of a front-rear wheel-drive two-wheel vehicle, comprising: 2. The cam lever includes a pair of levers which are formed line-symmetrically with respect to the front shaft and which rotate about the front shaft.
Operation wires are respectively attached to the pair of levers, and these operation wires are connected to the vehicle body via a support member arranged between the cam lever operation portion provided in the steering operation portion of the motorcycle and the pair of levers. The power transmission device for the front wheels of a front-rear wheel drive motorcycle according to claim 1, wherein the power transmission device is attached to a front wheel. 3. The guide spline spacer is coaxial with the front shaft, and a claw piece projecting from the sprocket portion is formed at an end of the guide spline spacer opposite to the wheel hub portion. 7. A fixing bracket for fixing the guide spline spacer is attached to a front swing arm that rotates in a vertical direction, and the fixing bracket is fixed by being fitted in a recess formed in the front swing arm. A power transmission device to the front wheels of the front-and-rear-wheel drive two-wheeled vehicle according to 1 or 2.