JPH09263283A - Rear wheel suspension device of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear wheel suspension device of motorcycle which can regurate the car height, at the setting to lessen the variation amount of the full length of a rear suspension main body itself. SOLUTION: At least the outer side end face side of the installing hole 18 of the lower side bracket 16 of a rear suspension main body 14 is formed in an elliptical hole, and a reversal collar 20 fitting to the elliptical hole, and holding an installed part, and to convert the full length of the rear suspension main body 14 by reversing in the up and down direction, is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wheel suspension system for a motorcycle having a rear suspension body capable of buffering the vertical movement of a swing arm and adjusting the vehicle height.

[0002]

2. Description of the Related Art In order to buffer the vertical movement of a swing arm that supports the rear wheels of a motorcycle, for example, the actual open sho 56-44 is used.
Generally, a rear suspension device is provided between the swing arm and the frame, as disclosed in Japanese Patent No. 908, Japanese Utility Model Laid-Open No. 2-29887, and the like.

Some models have a mechanism for adjusting the vehicle height by changing the total length of the rear suspension body of the rear suspension device. This will be described with reference to FIGS. 6 and 7. The rear suspension body 1 has an upper bracket 2 and a lower bracket 3, one mounting hole 4 is formed in the upper bracket 2, and the lower bracket 3 has two mounting holes 4.
Two mounting holes 5 and 6 are formed vertically, and the upper bracket 2 is mounted on the frame 7 through the mounting holes 4,
The lower bracket 3 is attached to a link mechanism 9 provided between the frame 7 and the swing arm 8 via either the attachment hole 5 or 6.

The total length of the rear suspension main body 1 means the length between the mounting hole 4 of the upper bracket 2 and the mounting hole 5 or 6 of the lower bracket 3, but the link mechanism 9 is lowered in the standard vehicle height state. By mounting the rear suspension main body 1 in the side mounting hole 6, the total length of the rear suspension main body 1 becomes the distance L1 between the mounting hole 4 and the mounting hole 6. On the other hand, in order to lower the vehicle height, the link mechanism 9 is attached to the upper mounting hole 5, and the length of the rear suspension main body 1 is set to the mounting hole 4.
The total length of the rear suspension main body 1 is shortened by setting the distance L2 between the mounting hole 5 and the mounting hole 5. The distance L3 is the stroke of the rear suspension main body 1.

[0005]

The vehicle height adjustment amount is a constant value,
For example, it is set to 30 mm. On the other hand, in a specific model, the lever ratio is about 2, and in order to satisfy the vehicle height adjustment amount of 30 mm, the length X between the mounting holes 5 and 6 of the lower bracket 3 may be set to, for example, 14 mm. .

However, in view of the balance between the wheel stroke and the stroke L3 of the rear suspension main body 1, when the lever ratio is, for example, about 3, the dimension X between the mounting holes 5 and 6 is set to satisfy the vehicle height adjustment amount of 30 mm. It must be about 10 mm, but then two mounting holes 5 and 6
The wall thickness between them decreases, and in extreme cases, two mounting holes 5 and 6
There is a problem that is connected. As described above, the conventional vehicle height adjusting device cannot reduce the pitch of the two mounting holes 5 and 6 of the lower bracket 3 of the rear suspension main body 1 to a certain extent or more, and therefore the vehicle height adjusting amount can be satisfied. There were cases where it was not possible.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rear wheel suspension device for a motorcycle capable of adjusting a vehicle height with a small amount of change in the total length of the rear suspension body itself. To aim.

[0008]

According to a first aspect of the invention, at least the outer end face side of the mounting hole of the lower bracket of the rear suspension main body is formed into an elliptical hole, and the mounting hole is fitted to the elliptical hole. It is characterized by providing a reversing collar for supporting the section and changing the overall length of the rear suspension main body by reversing in the vertical direction. The invention according to claim 2 is characterized in that the lower bracket is clamped by the outer peripheral portion of the inversion collar by the tightening force of a bolt screwed into the inversion collar.

According to the present invention as set forth above, in order to adjust the vehicle height, the reverse collar is removed from the mounting hole, inverted upside down, and then mounted again in the mounting hole. . By doing so, the total length of the rear suspension main body can be changed. Moreover, since the reverse collar has a shape that fits into the mounting hole, it does not rotate in the mounting hole. According to the second aspect of the present invention, the lower bracket is sandwiched by the outer peripheral portion of the inversion collar, so that the inversion collar does not move indefinitely along the axial direction of the bolt.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a rear wheel suspension system for a motorcycle according to the present invention will be described below with reference to the drawings. FIG. 1 shows an overall side view of a motorcycle to which a rear wheel suspension device according to the present embodiment is assembled. A link mechanism 13 is provided between a swing arm 11 supporting a rear wheel 10 and a frame 12. The link mechanism 13 includes a cushion lever 13a and a cushion rod 13b. The upper bracket 15 of the rear suspension body 14 is attached to the frame 12, and the lower bracket 16 is attached to the cushion lever 13a.

FIGS. 2 and 3 show a first embodiment of the present invention, in which the lower bracket 16 of the rear suspension body 14 has a distal end portion which is bifurcated in an inverted U shape and has side walls 17 respectively.
A mounting hole 18 is formed in the. The mounting hole 18 is an elliptical hole, and its long axis extends along the longitudinal direction of the lower bracket 16.

In the mounting hole 18, a shaft portion 19 having substantially the same shape as the mounting hole 18 and an outer peripheral portion of the shaft portion 19 are formed.
The shaft portion 19 of the reversing collar 20 having the flange 20a connected to the outer end surface of the shaft 9 is fitted. A through hole 21 is formed in one of the inversion collars 20, that is, the inversion collar 20 on the left side in the drawing, and a female screw 22 is formed in the other of the inversion collar 20. The respective axes P of the through hole 21 and the female screw 22 substantially coincide with each other, but the through hole 2
1 and the axis P of the female screw 22 are not aligned with the axis Q of the inversion collar 20 and are deviated. That is, the through hole 21 and the female screw 22 are formed eccentrically with respect to the reversing collar 20.

A needle roller bearing 23 is arranged between the side walls 17 of the lower bracket 16, and a bolt 24 penetrating the through hole 21 of one of the reversing collars 20 rotates the cushion lever 13 a via the needle roller bearing 23. Support freely. After the bolt 24 penetrates the needle roller bearing 23, its tip is screwed into the female screw 22 of the other inversion collar 20. Due to this screwing, the side wall 17 of the lower bracket 16 is tightened by the flange 20a.

Next, the operation will be described. FIG. 2 shows the position of the bolt 24 in the standard vehicle height state. To lower the vehicle height from this state, use the bolt 24 with a pair of inversion collars 20.
At the same time, the reversing collar 20 is once removed from the mounting hole 18 and turned upside down, and then fitted again into the mounting hole 18. Then, the through hole 21 and the female screw 22
Is eccentric with respect to the reversing collar 20, the positions of the through hole 21 and the female screw 22 after reversing are positions that are substantially axisymmetric with respect to the position before reversing, and are located above the position before reversing. This means that the total length of the rear suspension body 14 has become shorter.

Next, the bolt 24 is passed through the through hole 21 of the reversing collar 20 and then screwed into the female screw 22, but since the mounting hole 18 and the reversing collar 20 are both oval-shaped, they are reversed. The collar 20 is engageable with the inner surface of the mounting hole 18, so that even when the bolt 24 is tightened, the inversion collar 20 does not rotate and at the same time the flange 2
Since 0a is in contact with the lower bracket 16, it does not move indefinitely along the axial direction of the bolt 24.

4 and 5 show a second embodiment of the present invention. In the first embodiment, the mounting hole 18 is formed as one oval hole, but in the second embodiment, the mounting hole 18 is formed as two large and small oval holes. That is, the mounting hole 18 is formed of the small diameter hole 25 and the large diameter hole 26, the large diameter hole 26 is located outside the small diameter hole 25, and the inversion collar 20 is fitted only in the large diameter hole 26 and the flange 20.
The difference is that it does not have a. Since other configurations are the same as those in the first embodiment, description thereof will be omitted.

The difference in operation based on such a difference in structure is that when the bolt 24 is tightened, the flange 20a comes into contact with the side surface of the lower bracket 16 and tightens the lower bracket 16 in the first embodiment. On the other hand, in the second embodiment, the inner surface of the outer peripheral portion of the plate-like inversion collar 20 having no step is in contact with the step portion between the large diameter hole 26 and the small diameter hole 25 to tighten the lower bracket 16.

[0018]

According to the invention described in claim 1, at least the outer end face side of the mounting hole of the lower bracket of the rear suspension main body is formed into an elliptical hole, and the reversing collar adapted to the elliptic hole is provided. It is possible to adjust the vehicle height by setting the amount of change in the total length of the rear suspension itself to be small.

Further, since the change amount of the total length of the rear suspension main body can be set by the reverse color, it is not necessary to prepare a plurality of types of lower brackets having different mounting hole positions, which facilitates the common use of the lower brackets. . In the invention according to claim 2, since the lower bracket is sandwiched by the outer peripheral portion of the reversing collar, a fixing means such as a screw for fixing the reversing collar to the lower bracket becomes unnecessary.

[Brief description of drawings]

FIG. 1 is a side view showing an entire motorcycle in which a rear wheel suspension device according to the present invention is incorporated.

FIG. 2 is likewise a side view showing a main part of the first embodiment.

FIG. 3 is likewise a sectional view taken along the line AA of FIG.

FIG. 4 is likewise a side view showing the second embodiment.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a side view of a conventional rear wheel suspension device.

FIG. 7 is likewise an explanatory view of the operation.

[Explanation of symbols]

 13 Link mechanism (attached part) 14 Rear suspension body 16 Lower bracket 18 Mounting hole 20 Inversion collar 24 Bolt

Claims (2)

[Claims] 1. The entire length of the rear suspension main body formed by forming at least the outer end surface side of the mounting hole of the lower bracket of the rear suspension main body into an oval hole, supporting the attached portion in conformity with the oval hole, and reversing in the vertical direction. A rear wheel suspension system for a motorcycle, which is provided with a reversing collar for making a change. 2. The rear wheel suspension device for a motorcycle according to claim 1, wherein the lower bracket is clamped by an outer peripheral portion of the reverse collar by a tightening force of a bolt screwed to the reverse collar. .