JPH01289788A - Rear wheel suspension device for motorcycle - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of a spring force and a damping force by arranging both the indicating part for indicating the adjustment position of the spring force adjustment member of a coil spring in a cushion unit and that for indicating the position of the damping force adjustment member, in such positions that they can be simultaneously visible. CONSTITUTION:In a cushion unit 16 comprising a coil spring 18, a cylindrical hydraulic damper 20, and an oil reservoir 22, a damping force adjustment ring 56 is screwed on the columnar member 32 having been fixed on the end part of the piston rod 30 in the damper 20. The inside diameter part 58 of this adjustment ring 56 is engaged with a pushing rod 42, while the outside diameter part 60 thereof is provided so as to surround the opened peripheral part of the large diameter part 38 of a screw member 34. Further, a spring force adjustment ring 62 which has been formed nearly in a cylindrical shape is provided to this screw member 34. And graduations are provided on the outer circumferential surface of the large diameter part 38 and on respective rings 56, 62, so that a damping force indicating part is formed by both the outer circumferential surface of the large diameter part 38 and the ring 56, and that a spring force indicating part is formed by both the outer circumferential surface of the large diameter part 38 and the ring 62.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a rear wheel suspension system for a motorcycle having a spring-shaped Cushitan unit that allows adjustment of spring force and damping force.

(Background of the invention) There is a cylindrical cushion unit connected to the rear arm of a motorcycle in which the spring force of a coil spring placed outside the damper can be adjusted. Some devices have a spring receiver that supports one end rotatably mounted with a screw, and the position of the spring receiver can be adjusted in the wheel direction by rotating this spring receiver.There are also some devices that allow the damping force of the damper to be adjusted. This is well known.Here, the spring force is adjusted so that the spring force becomes stronger when the carrying load of the vehicle increases, and at this time, the damping force is also normally set to be stronger accordingly.Also, for sports driving. in case of,
If you want a soft ride, set both the spring force and the damping force to be strong.In this way, the spring force and the damping force can be set separately or separately. They are not set independently, but are set in close relationship with each other.

In this case, if the display section for visually checking the spring force setting and the display section for the damping force are separated, it is difficult to check both display sections, and it is difficult to set the two in relation to each other. A problem arises.

(Object of the invention) This invention was made in view of the above circumstances,
When setting spring force and damping force in relation to each other,
It is an object of the present invention to provide a rear wheel suspension system for a motorcycle having a cylindrical cushion unit that allows easy setting while comparing both displays.

(Example) Fig. 1 is a side view of the vicinity of the rear wheel suspension system of a motorcycle to which an embodiment of the present invention is applied, Fig. 2 is an m-plane view facing a part of the cushion unit, Fig. 3 and Fig. FIG. 4 is a diagram showing the display section when the spring force and damping force are maximized and minimized.

In FIG. 1, numeral 10 is a vehicle body frame, and 12 is a rear arm. The front end of the rear arm 12 is attached to the vehicle body frame 10 so as to be able to swing up and down, and the rear wheel 14 is held at the rear end. The rear part of the rear arm 12 is supported by a cylindrical cushion unit 16.

The cushion unit 16 has a fill spring 18 , a cylindrical hydraulic damper 20 located inside the spring 18 , and an oil reservoir 22 . The damper 20 has a sill 26 fixed to the upper spring receiver 24, a piston 28, and a piston rod 30.

A cylindrical member 32 is fixed to the end of the piston rod 30. Reference numeral 34 denotes a screw member having a small diameter portion 36, a large diameter portion 38, and a 7-rank portion 40 connecting the two. The inner diameter side of the small diameter portion 36 is press-fitted into the cylindrical member 32 and fixed thereto. The large diameter portion 38 opens in the opposite direction to the sill 26, and the I-layer of the push rod 42 that cuts through the columnar member 32 protrudes into the opening. Hole 4 with a long oval cross section
4 is formed, and the pusher 42 traverses this hole 44.

A throttle control rod 46 is inserted into the piston rod 30,
One end of the control rod 46 projects into the hole 44 and abuts against the push rod 42 . The other end of the control rod 46 faces a throttle part of an oil passage 52 that connects the first and second oil chambers 48,50 defined in the sill 26 by the piston 28, and together with this throttle part forms a throttle valve 54. do.

56 is a damping force adjusting ring as a damping force adjusting member, which is screwed into the member 32 from the opposite ring 26@, and its inner diameter part 58 engages with the push rod 42, while its outer diameter part 6
0 is newly curved so as to surround the opening edge of the large diameter portion 38 of the screw member 34.

Reference numeral 62 denotes a spring adjustment ring as a spring force adjustment member, which is formed into a substantially cylindrical shape so as to surround the outer periphery of the large diameter 8138 of the screw member 34 from the cylinder 26@, and has a small diameter portion 36 on the inner periphery side. A seven-rank portion 64 is integrally formed to be screwed into the formed threaded portion 36a. This seven-rank portion 64 serves as a spring holder that supports one end of the coil spring 18. Therefore, the diameter of the threaded portion 36a is slightly smaller than the inner diameter of the coil spring 18, and the outer diameter of the ring 62 is larger than the outer diameter of the coil spring 18.

The outer peripheral surface of the large diameter portion 38 of the screw member 34 and the ring 56.6
2 is marked with a scale as shown in Figure 3.4. That is, the outer circumferential surface of the large diameter portion 38 and the ring 56 form a damping force display portion A, and the outer circumferential surface of the large diameter portion 38 and the ring 62 form a damping force display portion A.
The 0-picture display WSA%B where the spring force display part B is formed is shown by connecting the optimal combination positions with lines as shown in Figure #I3.4, making it easy to visually confirm the optimal combination. It looks like this.

FIG. 3 shows the case when both the spring force and damping force of the spring 18 are maximum, and FIG. 4 shows the case when both the spring force and damping force are minimum.

In Fig. 2, 66 is the opening for locking the spring force adjustment ring 62 once for each frog. It has a lfl structure, and is formed by a coil spring 68 and a pawl 70 loaded in a gate plate provided on the seventh rank part 40 of the screw member 34, and a groove 72 cut in the axial direction on the inner surface of the ring 62. .

A gas chamber 7 is formed in the oil reservoir 22 by a free piston 74.
6 and an oil chamber 78 are defined, and the oil chamber 78 communicates with the second oil chamber 50 within the sill 26. The lf entry chamber 76 is filled with a pressurized nitrogen gas or the like.

Next, the operation of this embodiment will be explained. When the cushion unit 16 is compressed, the oil in the second oil chamber 50 flows into the first oil chamber 48 through the oil passage of the piston 28. At this time, the oil flow resistance is small (the damping force is also small), and the piston rod 30
As the oil enters the sill 26, the oil flows into the oil reservoir 22, and the free piston 74 moves to compress the gas chamber 76.

When the cushion unit 16 is extended, the oil in the first oil chamber 48 is compressed, but a valve is attached to the oil passage provided in the piston 28, which generates a very large oil flow resistance. Therefore, the oil in the first oil chamber 48 flows into the second oil chamber 50 through the throttle 54.

In order to increase the damping force when the cushion unit 16 is extended, turn the damping force adjustment ring 56 clockwise when viewed from the right side in Fig. 3), and push the control rod 46 to the left to tighten it. Throttle valve 54. At this time, the oil flow resistance of the throttle valve 54 increases and the damping force increases. On the other hand, in order to reduce the damping force during extension, the ring 56 can be rotated in the opposite direction (FIG. 4).

To increase the spring force, hold the spring adjustment ring 62 with your hand, rotate it in one direction, and move it to the shilling 26fi (
(Fig. 3), and in order to reduce the spring force, it is sufficient to rotate in the opposite direction (Fig. 4).

At this time, in Fig. 4.5, the right edge of the ring 62 is connected to the threaded member 34.
Since the scale is close to the scale attached to the large diameter portion 38 of the scale, the scale can be read accurately and easily from the relative position of the two.

Here, spring force and damping force are generally set in relation to each other. For example, when the carrying load increases or when driving in a sporty manner, both the spring force and damping force are doubled, and when a soft ride is desired, the spring force is increased. and damping force.

Since the damping force display section A and the spring force display B are provided adjacent to each other, and the optimum combinations are indicated by lines, the settings can be easily made while viewing these displays A and B.

Also, the diameter of the threaded portion 36a of the threaded member 34 is set to the diameter of the coil bone 1.
Since the inner diameter of the ring 62 is sufficiently increased to be close to the inner diameter of the ring 62, the total length of the projection that engages with the female thread of the ring 62 becomes longer, and the thickness of the ring part 64 where this female thread is provided, in other words, the axial length of the female thread. can be made smaller. Therefore, the overall length of the cushion unit 16 can be shortened while ensuring sufficient strength.

Further, since the outer diameter of the spring adjustment ring 62 is made larger than the height of the coil spring 18, the force required to rotate the ring 62 is reduced, and the ring 62 can be easily rotated by hand, improving operability.

(Effects of the Invention) As described above, the present invention is provided so that the damping force display section and the spring force display section can be viewed simultaneously.
You can set the optimal spring force and damping force while checking the image display at the same time.

[Brief explanation of the drawing]

FIG. 1 is a side view of the vicinity of a rear wheel suspension system of a motorcycle to which an embodiment of the present invention is applied, FIG. 2 is a partially sectional side view of a cushion unit, and FIGS. 3 and 4 are spring force - It is a diagram showing the display section when the damping force is set to the maximum and minimum. 16...Cushion unit 18...Coil spring 20...Attenuator 56...Damping force adjustment member (ring) 62...Spring force adjustment member (ring) A...Damping force display section B. ...Spring force display unit patent applicant Yamaha Power Iso Co., Ltd.

Claims (1)

[Claims] A rear arm that holds the rear wheel at its rear end and is pivoted to the body frame so that its front end can swing up and down, and the body frame are connected by a cylindrical cushion unit that has an adjustable hydraulic damper inside a coil spring. In the two-wheeled vehicle, a spring force adjustment member for adjusting the spring force of the coil spring, a spring force display section for displaying an adjustment position of the spring force adjustment member, and a damping force adjustment member for adjusting the damping force of the damper. , a damping force display section that displays the position of the damping force adjustment member,
A rear wheel suspension system for a motorcycle, characterized in that the spring force display section and the damping force display section are exposed on an outer surface of a vehicle body frame and are simultaneously arranged so as to be visually visible on the main body of the cylindrical cushion unit.