JPS59171772A - Suspension system 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 The present invention relates to a rear wheel suspension system for motorcycles, motorized bicycles, etc. 1. The rear wheel suspension system for conventional motorcycles has a swing arm 1 and a swing arm 1 as shown in FIG. Generally, two shock absorbers (3.3°) are installed between the seat and the body frame 2 near the seat. Normally the buffer 3,3
is equipped with a spring and a 7-yoke absorber on a concentric shaft. However, as shown in the figure, when the shock absorbers 3 and 3 are installed on the left and right sides of the vehicle body, it is very difficult to make the functions of the shock absorbers 3, 3 completely uniform in terms of production. There was a problem in which the screw IC was screwed up between the two and the steering stability was significantly impaired.

Therefore, recently, a second type of suspension system for this type of motorcycle has been developed.
As shown in the figure, a rotating arm 4 is rotatably supported on an undertube of a vehicle body frame 20, and a shock absorber 3 is pivotally supported between the tip of the rotating arm 4 and the vehicle body frame 2. There is a structure in which the approximately central part of the moving arm 4 and the swing arm 1 are connected by a tension rod 5 (Utility Model No. 57-460).
(See No. 89). According to this suspension system, the shock absorber 3 is located at the center of the vehicle body, and since the single shock absorber functions, ``the above-mentioned twisting of the vehicle body does not occur;
Maxillary longitudinal stability was improved.

However, in this case, the rotating arm 4, tension rod 5, etc. are arranged at the bottom of the vehicle body, so the distance between the vehicle body and the rear wheels becomes very complicated, requiring time and effort during maintenance or cleaning, and various electrical equipment We were having difficulty securing storage space for items, etc.

The present invention was made in view of the above circumstances, and attempts to solve the above-mentioned problems by separating the spring and shock absorber of the shock absorber and incorporating the shock absorber into the shaft support of the swing arm. It is something.

An embodiment of a rear wheel suspension system according to the present invention will be described below with reference to the drawings. In FIG. 3, the same reference numerals as in FIG. 1 are the same, and detailed explanation will be omitted. 6 is the rear wheel, and 1 and 7 are shock absorbers that are pivotally supported at the rear end of the swing arm.
is fixed to. 8 is a spring interposed between the swing arm 1 and the vehicle body frame 2.

4 is a cross-sectional plan view taken along the line fV-IV in FIG. 3, and FIG. 5 is a vertical cross-sectional side view taken along the line V-V in FIG. 4. In these figures, 9 is the support shaft of the shock absorber 7,
The support shaft 9 rotates together with the swing arm 1 by spline fitting or the like, and is rotatably supported together with the swing arm 1 by a bracket 11 welded to the cross pipe 10. Reference numeral 13 designates the main body of the shock absorber 7, which is fixed to a bracket 12 welded to the cross pipe 10. 14 is a sliding wall formed integrally with the support shaft 9, and 15 is a fixed wall formed integrally with the shock absorber main body 13. These sliding wall 14 and fixed wall 15 form two chambers, A and B. The chambers A and B are filled with oil. On the other hand, a small hole 16 and a large hole 17 are cut in the fixed wall 15, and the small hole 16 has a chamber B side and the large hole 17 has a chamber A side.
A valve 18, 19 is provided on each side. 20
is a gusset welded between the left and right swing arms,
A spring 8 is pivotally supported by a bracket 21 fixed on the gusset 20.

In the rear wheel suspension system of the present invention configured as described above, when the vehicle passes through a convex portion, the rear wheel 6 in FIG.
Rotate upwards around the center. At this time, as can be seen in the detailed view of FIG.
4 compresses the oil in chamber A to a high pressure. - The oil in the blade chamber B becomes under negative pressure, the valve 18 opens while the valve 19 remains closed, and the oil in the chamber A gradually flows into the chamber B through the small hole 16. At the same time, the swing arm (and the swing arm 8 interposed between the vehicle body frame 2)
Alleviates the shock when passing through a convex part. .

After passing the convex portion, the rear wheel 6 attempts to rotate downward together with the swing arm 1. At this time, in the shock absorber 7, the oil in the chamber B is compressed and becomes high pressure.1-The oil in the blade chamber A becomes negative pressure, the valve 18 closes and the valve 19 opens, and the oil in the chamber B is compressed and becomes high pressure. The oil rapidly passes through the large hole] 7 and flows into chamber A.

Next, when passing through the recess, the process is completely opposite to the above.

Thus, the rear wheel suspension system of the present invention absorbs and alleviates vibrations and shocks of the vehicle when the vehicle is running.

As described above, according to the present invention, the loosening device of the rear wheel suspension system of a motorbike, etc. is divided into a suspension ring and a shock absorber, and the shock absorber is built into the shaft support of the swing arm, and the spring Since the swing arm is interposed between the body frame and the swing arm, there is no need to worry about it, and it also makes it easier to secure storage space for electrical components, etc.

Since the left and right swing arms are still connected by shock absorbers and gussets, the rigidity of the swing arms themselves has increased, making it possible to improve the stability of the vehicle. At the same time, since the shock absorber and spring are located at nine centers in the left-right direction of the vehicle body, twisting does not occur between them and the rear wheels of the vehicle body, further improving maneuverability.

If the stopper 22 is formed integrally with the inner wall of the shock absorber body 13 in FIG. 5, the upward movement of the swing arm can be completely restricted, and the rear wheels can be (including) can be prevented from bottoming out. A useless swing arm and shock j' psoba all in one?・1st place 1~, VL to fix the spindle
You may. Further, the springs may be provided on the left and right sides of the vehicle body as in the conventional case.

[Brief explanation of drawings]

Figures 1 and 2 are left side views showing a conventional rear wheel suspension system, Figures 3 to 5 are views showing an embodiment of the rear wheel suspension system according to the present invention, and Figure 3 is a left side view. , Figure 4 is a cross-sectional plan view taken along the line IV-Yv in Figure 3, and Figure 5 is a vertical side view taken along the line V-V in Figure 4 ■...Swing arm 2--- Vehicle body 7 Remuro...Rear wheel 7-Shockapunba8...
-Spring Applicant Kawasaki Heavy Industries, Ltd. Agent Patent Attorney Yujibe Taka Figure 1 Figure 2

Claims (1)

[Claims] The front end of the swing arm, which supports the rear wheel at the rear end, is pivoted on the vehicle body frame, a shock absorber is built into the pivot support, and a spring is interposed between the swing arm and the vehicle body frame. Motorcycle rear wheel suspension system 0