JPS59171774A - 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.

As shown in Fig. 1, a conventional rear wheel suspension e for a two-wheeled vehicle generally has two shock absorbers 3°3' installed between the swing arm 1 and the vehicle body frame 2 near the seat. 31 Usually, the shock absorbers 3, 3' are equipped with a spring and a shock absorber on concentric shafts. However, as shown in the same figure, if it is installed on the left and right sides of the vehicle body, 5
To make the functions of these buffers 3 and 3' completely homogeneous is as follows.
It is very difficult to produce 7 Therefore, the vehicle itself and the rear car @ 6
There was a problem in which twisting occurred between the two and the steering stability was significantly impaired.

Therefore, recently, as shown in FIG. 2, as a suspension system Q4f for a two-wheeled vehicle, a rotating arm 4 is rotatably supported on an under tube of a vehicle body frame 2.
A shock absorber 3 is installed between the tip of the body frame 2 and the body frame 2.
support, approximately the center of the rotating arm 4 and the swing arm 1
There are some types in which these are connected by a tension rod 5 (see Utility Model Application No. 57-46089-). According to this suspension system, the shock absorber 3 is located in the center of the vehicle body, and because the single shock absorber performs its function, the twisting of the vehicle body as described above does not occur, and the handling stability is improved. It was done.

However, in this case, since the rotating arm 4, tension rod 5, etc. are arranged at the bottom of the vehicle body, the space between the vehicle body and the rear wheels becomes very cluttered, which requires time and effort during maintenance or cleaning, and various It was difficult to secure storage space for electrical equipment, etc.

The present invention has been made in view of the above circumstances, and the spring of the shock absorber and the shock absorber are separated, and a spring is attached to the shaft support of the swing arm so as to constantly urge the swing arm downward. This is an attempt to solve the above-mentioned problem by connecting the vehicle body frame and swing arm with a shock absorber.

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, so a detailed explanation will be omitted. Reference numeral 7 designates a single shaft support that rotatably supports the front end of the swing arm 1, and reference numeral 8 designates a shock absorber interposed between the swing arm 7 and the vehicle body frame 2.

Figure 4 is a cross-sectional plan view taken along line IV-IV in Figure 3;
The figure is a longitudinal sectional side view taken along the line v--v in FIG. 4. In these figures, the rotating shaft 9 is integrated with the front end of the swing arm 1 through a Sugelife fitting 'JK', and is connected to a7. Bracket 1 welded to pipe 10
1 and is rotatably supported together with the swing arm 1.

Reference numeral 13 denotes an outer wall of the shaft support 7, which is fixed to a bracket 12 welded to the cross pipe 1o.

Reference numerals 121 and 15 denote locking members integrally formed on the rotation shaft 9 and the outer wall 13, respectively, and a spring 16 is provided between the locking members 14 and 15 so as to always bias the swing arm J downward. It has been intervened.

Reference numeral 17 denotes a contact member that comes into contact when the swing arm 1 rotates upward by a certain angle α, and the corresponding contact member 17
A spring 18 is also interposed between the and the locking member 15. Reference numeral 19 denotes a gusset welded between the left and right swing arms 1, and the shock absorber 8 is pivotally supported by a bracket 2o fixed on the gusset 19.

In the rear wheel suspension system of the present invention constructed as described above, when the vehicle passes a convex portion, the rear wheel 6 rotates upward together with the swing arm 1 in FIG. 3.・5th when
As can be seen in the detailed view of the figure, the pivot shaft 9 integral with the swing arm 1 pivots counterclockwise, compressing the spring 16 via the locking member 14. At the same time, a shock absorber 8 pivotally supported by the swing arm 1 attempts to prevent the swing arm 1 from rotating upward, and also absorbs and alleviates the vibration when passing through the convex portion.

Furthermore, if the swing arm 1 rotates beyond the angle α,
The locking member 14 contacts the contact member 17, and the spring 18
Also compress. Therefore, in this case, the spring 16.
The sum of the 18 repulsive forces acts as a force that attempts to prevent the swing arm 1 from rotating.

In accordance with the above, according to the present invention, the rear wheel suspension system of a motorcycle or the like is divided into a shock absorber spring and a shock absorber, and the shaft support of the swing arm is always urged downward. As shown in Figure 7, the shock absorber is attached to the body frame and swings 7-m,! ：￥) Since it is inserted between the two, the appearance is sleeker and it is also easier to secure storage space for electrical components, etc.

In addition, the left and right swing arms are connected by a rotating shaft and gusset that are integrated with the spring locking member, increasing the rigidity of the swing arms themselves and improving the stability of the vehicle. Ta. At the same time, since the spring and shock absorber are located at the center of the vehicle body in the lateral direction, twisting does not occur between the vehicle body and the rear wheels, further improving maneuverability.

Furthermore, if a plurality of springs with different repulsive forces are interposed between the rotation shaft and the shaft support as in the embodiment, the relationship between rear wheel load and wheel stroke depending on the swing angle of the swing arm can be made progressive. It is easily possible to do so. However, it goes without saying that the number of springs may be one instead of a plurality.

Note that the shock absorbers may be provided on the left and right sides of the vehicle body as in the conventional case.

[Brief explanation of the drawing]

1 and 2 are left side views showing a conventional rear wheel suspension system, FIGS. 3 to 5 are views showing an embodiment of the rear wheel suspension system according to the present invention, and FIGS. 4 is a cross-sectional plan view taken along line IV-IV in FIG. 3, and FIG.
It is a vertical side view taken along the v-v section in the figure. 1.-Swing arm 2.--Heavy body frame 6-
--Rear wheel 7--Axle support β8--Shock aboom bar 16.18--Sublink Applicant Kawasaki Heavy Industries g, Ri Co., Ltd. agent Patent attorney Takashi 141 Next part Figure 1 Figure 2 Figure 3 7. 1゛Figure 4 ＼ To - ■1- 16' 1~-- Figure 5

Claims (1)

[Claims] The front end of a swing arm that pivotally supports the rear wheel at the rear end is pivotally supported on the vehicle body frame, a spring is interposed in the pivot support to bias the swing arm downward, and a shock is applied to the vehicle body frame and the swing arm. A rear wheel suspension system for motorcycles connected with an absorber.