JPS6189189A - Supporter for rear wheel of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rear wheel support device for supporting the rear wheel of a motorcycle by a cantilevered rear arm, and particularly to a device suitable for use in competition vehicles.

[Conventional technology]

Conventionally, the technology of supporting the rear wheel of a motorcycle with a cantilevered rear arm is well known (for example, Japanese Utility Model Publication No. 53-53
Publication No. 237). This type of rear wheel suspension system is effective in reducing the weight of the vehicle, particularly in reducing unsprung weight and improving the cushioning performance of the vehicle.

However, since the grounding point of the rear wheel and the extension direction of the rear arm are offset in plan view, a strong torsional force is applied to the rear arm when the rear wheel receives an impact from the ground, so it is necessary to have a large rigidity to withstand this force. In addition, it is difficult to quickly replace the rear wheels or the sprockets that drive the rear wheels, making them unsuitable for competition motorcycles with such requirements.

[Purpose of the invention, means for solving the problem]

This invention eliminates the above-mentioned problems, supports the rear wheel of a motorcycle with a cantilevered rear arm, reduces the weight of the motorcycle, and drives the rear wheel without impairing the rigidity of the rear wheel support part. The purpose of this system is to enable quick replacement of sprockets, and its feature is that a cantilevered rear arm is rotatably supported at the rear of the body frame, and the rear wheel is attached to the rear end of the rear arm. 1. A cylindrical support shaft that supports a rigid sprocket and a cylindrical shaft that supports a rear wheel hub are arranged on the same axis, and the cylindrical support shaft and the cylindrical shaft are engaged with each other through an engaging means. It is to be releasably engaged.

〔Example〕

Hereinafter, this invention will be explained with reference to the illustrated 'MtA example. In the figure, 1 is a motorcycle and 2 is its body frame. Front wheels 4 are rotatably supported at the front of the vehicle body frame 2 via front forks 3, and rear wheels 6 are supported at the rear via rear arms 5, respectively. γ is a slowing gear that connects the free end of the rear arm 5 and the vehicle body frame 2, 8 is a dynamic crab unit that drives a driven sprocket 10 attached to the rear wheel 6 via a chain 9, 11 is a fuel tank, and 12 is a passenger's It is a sheet.

As shown in FIG. 2, the rear arm 5 is a cast product of aluminum alloy, and is rotatably supported at the rear of the vehicle body frame 2. The rear arm 5 has a substantially cylindrical boss portion 5a, and a rear arm 5a that is pivoted at the rear of the vehicle body frame 2. The rear wheel support arm 5b has a substantially rectangular cylindrical shape that is curved in a substantially arc shape to avoid the rear tire from a position biased towards the \- side and extends rearward. That is, in plan view,
The base end of the support arm 5h is formed to protrude and extend diagonally from the outside of the tire toward the side of the vehicle, and is bent from the side of the tire toward the inside of the rim.

The rear end of the rear wheel support arm 5b is closed, and the side surface thereof has a protrusion 5C that protrudes toward the center in the width direction of the vehicle. A through hole 5d in the left and right direction is provided near the rear end of the rear arm 5 including the protruding portion 5C, in which two ball bearings 5e,
5e is fitted.

A cylindrical support 11715 and a cylindrical shaft 16 are fitted into the ball bearings 5e and 5s, and the cylindrical support shaft 15 has a rear vi6 attached to the flange 15.
The cylindrical shaft 16 supports the driven sprocket 10 at its mounting 7 flange 16&. The cylindrical support shaft 15 and the cylindrical shaft 16 are formed on the inside of each, and are unrotatably coupled to the outer spline formed on the outer surface of the rear axle 17 by an inner spline, and are further prevented from being removed by a nand 18. . The cylindrical part 1ya of rear car #+17 is bamboo tube 15, 16
The shaft hole at the inner end of the shaft is supported, and both are precisely aligned on the same 1111 line. In this embodiment, the outer spline formed on the outer surface of the rear axle 17 has a stepped shape with a larger diameter on the head 17h side and a smaller diameter on the head 17e side to facilitate insertion and removal.

The brake disc 20 is located between the rear wheel 6 and the rear wheel support arm 5b,
That is, it is arranged radially outward of the protrusion 5c, and cooperates with the caliper 21 and pad 22 to constitute a known disc brake. 23 is a rear wheel 6 whose brake disc 20 will be described later.
At the same time, the bolt 21 fixed to the cylindrical support shaft 15 is a nut. The rear a6 is a so-called cast wheel in which the spokes 6a, the rim 6b, and the hub 6C are integrally cast.The spokes 6a are offset from the widthwise center of the rim 6b in the direction opposite to the rear wheel support arm 5b. A space is formed inside the rim 6b in which a brake device such as a brake disc 20 and a caliper 21 are arranged. 6d is a tire.

A mounting bolt 26 is provided on the mounting 7 flange 16& of the cylinder shaft 16 and projects inward through a buffer rubber 25, and the driven sprocket 10 is fastened thereto. 27i
i: Bolt that fixes the lower end of the shock absorber 7 to the rear arm 5;
28 is a decorative cover fitted onto the inner peripheral surface of the hub 6c.

In order to adjust the tension of the chain 9, the base end of the rear arm 5 is supported by the vehicle body frame 2 so as to be lockable in the front and rear directions s=b. That is, a support ring 29 of the rear arm 5 is welded to the vehicle body frame 2, and a support member 31 that supports a pivot shaft 30 is supported thereon so as to be slidable in the longitudinal direction. and two nuts 33 so that the front and rear positions can be adjusted and locked.

34 is a spacer interposed between the left and right supporting members 31, and the spacer 34 rotatably supports both ends of the boss portion 5a via bearings 35, 35.

Since this embodiment has the above configuration, the dynamic crab knit 8
is driven, and the driven sprocket 10 is driven through the chain 9.
When driven, the cylindrical shaft 16 rotates, and accordingly, the cylindrical support shaft 15 rotates via the rear axle 17, so the rear wheel 6 is driven and the motorcycle runs.

When assembling or replacing the rear a6, chain 9, and driven sprocket 10, since the rear arm 5 is cantilevered and there is no rear arm 5 in one example of the rear wheel 6, the rear a6 can be quickly attached and detached using the nut 21. can. Furthermore, when replacing the driven sprocket 10, the driven sprocket 10 can be immediately removed together with the support cylinder 16 by removing the nut 18. Since the sprocket 10 supported by the rear arm 5 remains, reassembly is easy.Furthermore, by preparing the driven sprocket 10 with a different number of teeth by attaching it to the cylinder shaft 16 in advance, replacement work can be carried out quickly. can.

〔Effect of the invention〕

This invention includes a cylindrical support shaft that rotatably supports a cantilever type Liano at the rear of the vehicle body frame, and supports a rear wheel drive sprocket at the rear end of the rear arm, as shown in H. The cylindrical shaft that supports the hub of the rear wheel is disposed on the same axis, and the cylindrical support shaft and the cylindrical shaft are removably engaged through the engagement means, so that when replacing the wheel, Also, when replacing the rear wheel drive sprocket, the replacement can be easily performed by removing the rear axle, which is the engagement means. Furthermore, by removing the rear axle, it is possible to simultaneously remove the wheels from one side of the vehicle body and the rear wheel drive sprocket from the other side, which has the effect of making maintenance and assembly work easier and faster.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a motorcycle, and FIG. 2 is an enlarged sectional view taken along the line 1--2. 5 hobby...-Rear arm, 5a battle-◆・Boss part, 5h・
...Rear wheel support arm, 5C...Protrusion, 10...
- Driven sprocket, 15... Cylindrical support shaft, 16...
...Cylinder axle, 17...Rear axle.

Claims (5)

[Claims] (1) A cantilevered rear arm is rotatably supported at the rear of the vehicle body frame, and the rear end of the rear arm has a cylindrical support shaft that supports the rear wheel drive sprocket and a cylinder that supports the rear wheel hub. A rear wheel support device for a motorcycle, in which a cylindrical support shaft and a cylindrical shaft are disposed on the same axis, and the cylindrical support shaft and the cylindrical shaft are removably engaged through an engaging means. (2) The rear wheel support device for a motorcycle according to claim 1, wherein the rear wheel drive sprocket and the rear wheel hub are arranged on the left and right sides sandwiching the rear end of the rear arm. (3) The engagement means for engaging the cylindrical support shaft and the cylindrical shaft is the rear axle, and the inner spline formed on the cylindrical support shaft and the cylindrical shaft and the side spline formed on the axle are connected to each other. A rear wheel support device for a motorcycle according to claim 1, which is constructed by engagement. (4) The rear wheel support device for a motorcycle according to claim 1, wherein the cylindrical support shaft and the cylindrical shaft are removably connected to a rear wheel drive sprocket and a rear wheel hub, respectively. (5) The motorcycle according to claim 1, wherein the rear arm is hollowly cast from a light alloy between a boss pivotally supported at the rear of the vehicle body frame and a support shaft supporting the rear wheel. Rear wheel support device.