JPH03200497A - Rear wheel device for motorcycle - Google Patents

Abstract

PURPOSE:To make the disposition of a knuckle and a brake disc assembling body compact in a motorcycle rear wheel device provided with a disc brake for steering a rear wheel, by disposing a brake disc in a fixed knuckle for supporting a steering knuckle pivotally. CONSTITUTION:A disc brake 81 for braking a rear wheel 27 is provided by fixing a brake disc 83 screwingly at the holder 70 of a constant velocity type universal coupling 69 by a bolt 82. A caliper to be frictionally engaged with the brake disc 83 by oil pressure is screwingly fixed at a fixed knuckle 41 and formed to be frictionally engaged with the brake disc 83 by the stepping-in of a brake pedal. With this constitution, the inside of the fixed knuckle can be utilized effectively so as to attain compactness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rear wheel device for a motorcycle, which is equipped with a disc brake for making the rear wheel steerable and braking the rear wheel.

(Prior Art) Conventionally, motorcycles whose rear wheels can be steered have the following configuration. That is, while a fixed knuckle is attached to the vehicle body, a steering knuckle that supports the rear axle is fitted inside the fixed knuckle, and the upper and lower ends of these knuckles are pivoted to each other by pivot pins. The wheels are said to be steerable.

In the above configuration, a large load is applied to the pivot portion of the rear wheel relative to the vehicle body. For this reason, it is necessary to ensure a predetermined strength for this pivot point, and therefore the span between the upper and lower pivot points of both knuckles is lengthened to some extent. As a result, both knuckles have a large shape.

On the other hand, many motorcycles are equipped with disc brakes to brake the rear wheels.

In this case, in order to ensure that the brake has a predetermined braking force, the diameter of the brake disc that is frictionally connected to the caliper is increased to some extent.

(Problems to be Solved by the Invention) However, the extra space in the body of a motorcycle is extremely small compared to the above-mentioned sizes of both knuckles and brake discs. Therefore, it is not easy to rationally arrange the knuckles and brake discs in such a surplus space so that they do not interfere with each other.

(Purpose of the Invention) This invention has been made in view of the above-mentioned circumstances, and aims to compactly fit the knuckles and brake disc assembly that allows the rear wheels to be freely steered into the surplus space of a motorcycle. The purpose is to enable installation.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the brake disc of the disc brake is disposed within a fixed knuckle.

(for production) The effects of the above configuration are as follows.

A fixed knuckle 41 is attached to the power transmission case (vehicle side) 181, and a steering knuckle 48 that supports the rear wheel 27 via the rear axle 47 is provided, and this steering knuckle 48 is fitted inside the fixed knuckle 41. When the steering knuckle 48 is pivoted to the fixed knuckle 41 so as to be freely steerable, the span between the upper and lower pivot points of this pivot is made to be long to some extent because the pivot of the steering knuckle 48 relative to the fixed knuckle 41 needs to ensure a predetermined strength. This is required.

For this reason, these fixed knuckles 41 and steering knuckles 48 are both 6 larger in shape, and
Of these, the fixed knuckle 41 is the steering knuckle 4.
This fixed knuckle 41 has a larger shape because it fits inside. Therefore, this fixed knuckle 41
An extra space 86 larger than the steering knuckle 48 is created inside the steering knuckle 48.

Therefore, in this invention, paying attention to the above point, the brake disc 83 having a large diameter is arranged in the surplus space 86 inside the fixed knuckle 41. Therefore, the large surplus space inside the fixed knuckle 41 is arranged. 86 is effectively utilized, and these fixed knuckles 41 and brake disc 83 are constructed compactly.

Furthermore, since the brake disc 83 is housed inside the fixed knuckle 41 as described above, the steering knuckle 48 and the rear wheel 2 supported by the steering knuckle 48 via the rear axle 47
7 and 7 can be brought close to each other without being obstructed by the brake disc 83. Moreover, although the fixed knuckle 41 and the steering knuckle 48 are large as described above, the steering knuckle 48 is relatively small because it fits inside the fixed knuckle 41. Therefore, the above steering knuckle 48
can be easily arranged in the surplus space 87 inside the wheel 45 constituting the rear wheel 27.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a scooter-type motorcycle, and the body frame 2 of this motorcycle 1 has a head pipe 3 at its front end, and a main frame 4 extends rearward from this head vibe 3. .

The front side of the main frame 4 is bent into a U-shape when viewed from the side, and loop frames 6 are protruded from the bent portion 5 on both left and right sides.

A front fork 8 is supported on the head vibe 3 so as to be steerable. The front fork 8 includes a steering shaft 9 supported by the head vibrator 3 so as to be rotatable around the axis, and a fork portion 10 connected to the lower end of the steering shaft 9. The front wheel 1 is attached to the fork portion 10.
1 is supported, and a handle 12 is attached to the upper end of the steering shaft 9.

On the other hand, the rear part of the main frame 4 is branched into two pipes, and a pair of left and right brackets 13 are protruded from each of the branch pipes. 17 are supported. Further, a power transmission case 18 on the vehicle body side is connected rearward from the crankcase 17, and is vertically swingable about the pivot shaft 14.

A bracket 21 is provided to protrude rearward from the rear part of the bent portion 5, and a first link 2 is attached to the protruding end of the bracket 21.
The upper and lower middle portions of 2 are pivotally supported by a first pivot pin 23. The upper rotating end of the first link 22 and the front end of the crankcase 17 are connected by the second link 24, while the front part of the loop frame 6 and the lower rotating end of the first link 22 are connected to each other by the second link 24. A buffer 25 is interposed between them.

A rear wheel 27 is supported at the rear end of the power transmission case 18 so as to be steerable. That is, the crank case I7 and the power transmission case 18 constitute a rear wheel support member. The power of the engine 16 is transmitted to the rear wheels 27, allowing the motorcycle l to travel. In addition, motorcycles
When the rear wheel 27 receives an impact from the road surface while driving,
The above impact is absorbed by the vertical swinging of the power transmission case 18 and the interlocking movement of the shock absorber 25.

In addition, 30 is a carburetor, 31 is an air cleaner, and 32 is a fuel tank. Also, 33 is a sheet, and this sheet 3
A footrest 34 for a rider seated at 3 is formed on the upper surface side of the bent portion 5 and the loop frame 6, and 35 is a headlamp.

In FIG. 3, the crankcase 1 of the engine 16 is
7 supports a crankshaft 38. 39 is a connecting rod. Further, in FIG. 2, 40 is a starter motor.

Nationwide, on the right side of the rear end of the power transmission case 18, a fixed knuckle 41, which is U-shaped in front view, is attached to a bolt 42.
It is screwed down. The rear wheel 27 has a hub 44.
It is composed of a wheel 45 and a tire 46, and a rear axle 47 is fitted into the hub 44 and fixed with screws.

Also, a steering knuckle 4 supporting the hub 44 is provided.
8 is provided. The upper and lower ends of the steering knuckle 48 are fitted into the fixed knuckle 41, and are pivotally supported to the fixed knuckle 41 by lower pivot pins 50 and 51. These 50 and 51 lower pivot pins are almost f! They are located on the same straight axis, so that the rear wheel 27 is supported with respect to the power transmission case 18 so as to be freely steerable.

Further, a steering actuator 52 for steering the rear wheel 27 is provided inside the rear end of the power transmission case 18 . The steering actuator 52 is composed of an electric motor 53, which is a servo motor and whose axis is vertically oriented, fixed to the power transmission case 18, and a rotating arm 54 attached to the output shaft of the electric motor 53. The above rotating arm 5
One end of the interlocking link 55 is connected to the steering knuckle 48 by a ball joint 56, and the other end of the interlocking link 55 is connected to the knuckle arm 57 of the steering knuckle 48 by another ball joint 58.

When the electric motor 53 operates, the rotating arm 54
rotates in the direction shown by arrow A in FIG. Then, in conjunction with this, the rear wheel 27 moves up and down as shown by arrow B in FIG.
It rotates about the lower pivot pin 50°51, that is, the rear wheel 27 is steered by this.

In the above case, the steering actuator 52 and the knuckle arm 57 are located adjacent to each other in the left and right directions and are provided close to each other, and the interlocking link 55 extends substantially horizontally in the left and right directions. That is, the steering actuator 52 and the knuckle arm 57 are provided at substantially the shortest distance from each other,
are connected to each other.

The power of the crankshaft 38 is transmitted to the rear wheel 27 in the following manner.
It is now possible to convey the information to

That is, especially with reference to FIG. 3, an intermediate shaft 6 is supported in the middle part of the power pressure transmission case 18, and the intermediate shaft 61 is connected to the intermediate shaft 61 via a V-belt type transmission 62. Power is transmitted from the crankshaft 38. This transmission 62 includes a driving pulley 63 attached to the crankshaft 38, a driven pulley 64 rotatably supported on the intermediate shaft 6■, and a V-belt 65 wound around both pulleys 63 and 64. The speed reduction ratio is configured such that as the engine 16 speeds up, the reduction ratio becomes smaller. Also,
The intermediate shaft 61 is connected to a driven pulley 64 by a centrifugal clutch 67.

Further, - an output shaft 6 is provided at the rear end of the power transmission case 18;
6 is supported, and a gear reducer 68 is provided which reduces the power of the intermediate shaft 61 and transmits it to the output shaft 66.

More importantly, the rear axle 47 is connected to the output shaft 66 by a constant velocity universal joint 69. This constant velocity universal joint 69
consists of a retainer 2x70 attached to the output shaft 66, a ball 71 attached between the end of the rear axle 47 (not shown) inserted into this retainer 70, and a rubber boot 72 covering these. It is configured.

When the engine 16 operates, this power is transmitted from the crankshaft 38 to the centrifugal clutch 67 via the transmission 62. When the centrifugal clutch 67 reaches a predetermined rotation speed, the centrifugal clutch 67 is engaged, and the power of the crankshaft 38 is transferred to the transmission 62 and the centrifugal clutch 6.
7 to the intermediate shaft 61. Furthermore, this power is transmitted to the rear wheel 27 via the gear reducer 68 and the constant velocity universal joint 69, allowing the motorcycle l to travel.

In FIG. 2, a speedometer 75 for detecting the rotation speed of the front wheels 11 is provided. 76 is the front wheel 1 mentioned above
This is a wire that transmits the rotation of 1 to the speedometer 75. Further, a steering angle detector 77 for detecting the steering angle of the steering shaft 9 is provided, and this steering angle detector 77 is supported by a bracket 78 protruding from the front part of the main frame 4. There is.

79 is an electronic control device, and this control device 79 receives the speed detection signal from the speedometer 75 and the steering angle detector 7.
The steering angle detection signal from 7 is manually inputted via the electric wire 98, and based on each of these detection signals, the steering angle detection signal is input to the other electric wire 98'.
The steering actuator 52 is actuated via the steering actuator 52. The rear wheels 27 are then steered to match the speed and steering angle.

A disc brake 81 for braking the rear wheel 27 is provided. This brake 81 has a brake disc 83 that is screwed into the retainer 70 of the constant velocity universal joint 69 by a bolt 82. On the other hand, a caliper 84 which can be hydraulically frictionally joined to the brake disc 83 is screwed to the fixed knuckle 41 with a bolt 85. When the rider depresses the brake pedal, the caliper 84 is brought into frictional contact with the brake disc 83, and the rear wheel 27 is braked.

In FIG. 1, in order to ensure a predetermined strength in the pivot portion of the steering knuckle 48 relative to the fixed knuckle 41, the span between the upper and lower pivot points in this pivot portion is lengthened to some extent.

Therefore, both the fixed knuckle 41 and the steering knuckle 48 have a large shape, and
Of these, the fixed knuckle 41 is the steering knuckle 4.
This fixed knuckle 41 has a larger shape because it fits inside.

Therefore, a surplus space 86 larger than the steering knuckle 48 is created inside the fixed knuckle 41, and a brake disc 83 having a large diameter is arranged in the surplus space 86 inside the fixed knuckle 41. has been done. In other words, the large surplus space 86 inside the fixed knuckle 41 is effectively utilized, and the fixed knuckle 41 and the brake disc 83 are configured compactly.

Further, as described above, although the fixed knuckle 41 and the steering knuckle 48 are large, the steering knuckle 48 is relatively small because it fits inside the fixed knuckle 41. The steering knuckle 48 is adjacent to the rear wheel 27 supported via the rear axle 47, but in this case, as described above, the relatively small steering knuckle 48 is attached to the rear wheel 27.
It is reasonably arranged in the surplus space 87 of I11 of the wheels 45 constituting 7.

According to the configuration of the above embodiment, the brake 81
Since it is provided on the side that is not steered, it has the advantage that the steering can be made lighter.

Although the above is based on the illustrated example, the brake 81 may be provided on the rear wheel 27 side to be steered, that is, the brake disc 83 may be attached to the hub 44 or the wheel 45 side, and the steering knuckle 48 A caliper 84 may be attached to the side.

(Effects of the Invention) According to the present invention, when the steering knuckle is fitted into the fixed knuckle, the brake disc of the disc brake is arranged inside the fixed knuckle, so the fixed knuckle has a larger surplus space than the steering knuckle. Therefore, the fixed knuckle and brake disc can be constructed compactly.

Further, as described above, since the brake disc is housed inside the fixed knuckle, the steering knuckle and the rear wheel supported by the steering knuckle can be brought close to each other without being obstructed by the brake disc. Furthermore, the steering knuckle is relatively small because it fits inside the fixed knuckle. Therefore, the steering knuckle can be comfortably placed in the surplus space inside the wheels that constitute the rear wheels.

Therefore, the assembly of the fixed knuckle, steering knuckle, and brake disc can be arranged compactly as a whole by making effective use of each surplus space.

(Margin below)

[Brief explanation of drawings]

The figures show an embodiment of the invention, and Figure 1 is 1-1 in Figure 3.
2 is a side view of the motorcycle, 3 is a plan sectional view of the power transmission system, and 4 is IV-I of 3.
A view taken along the line V, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4. l.. Motorcycle, 2.. Body frame, 18. Power transmission case (vehicle side), 27.. Rear wheel, 41.. Fixed knuckle, 45.. Wheel, 47. Rear axle, 48.. Steering knuckle. 66... Output shaft, 81... Brake, 83... Brake disc, 84... Caliper, 86...
Surplus space, 87...surplus space. Figure 1 70

Claims (1)

[Claims] 1. A fixed knuckle is attached to the vehicle body, and a steering knuckle is provided to support the rear wheel via the rear axle. A rear wheel device for a motorcycle in which the rear axle is connected to an output shaft provided on the rear wheel, and a disc brake for braking the rear wheel is provided, wherein the brake disc of the disc brake is disposed within a fixed knuckle. rear wheel device.