JPS60240584A - 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] [Industrial Application Field] The present invention relates to a rear wheel suspension system for a motorcycle, and in particular,
This invention relates to an improvement in a rear wheel suspension system having a so-called monoshock structure, in which the swinging motion of a swing arm supporting a rear wheel is absorbed by a single shock absorber via a link mechanism.

[Prior art]

In recent years, in motorcycles, the shock absorber of the rear wheel suspension system (hereinafter simply referred to as the suspension system) has been placed near the center of the vehicle body in order to centralize the weight and improve maneuverability and stability. In order to gradually improve the shock absorbing properties of the vehicle and improve its running performance, a suspension system with a so-called monoshock structure, which is equipped with a link mechanism and a single shock absorber, was devised, and is currently in use. It has been implemented.

By the way, according to the above-mentioned conventional suspension system having a monoshock structure, one fulcrum of the shock absorber is located below the seat rail of the vehicle body frame, or at the connection point between the tank rail and the seat rail of the vehicle body frame, and Because the other side is connected to the swing arm that supports the rear wheel via a link mechanism, the shock absorber is not close enough to the center of gravity behind the engine's cylinder block.
Therefore, from the viewpoint of weight concentration, countermeasures have been insufficient.

[Purpose of the invention]

In view of the above-mentioned problems, this invention moves the shock absorber as close as possible to the center of gravity of the vehicle body to further promote the concentration of weight, and also provides a sufficiently long distance between the support points at both ends of the shock absorber to achieve a long cushion stroke. To provide a rear wheel suspension system for a motorcycle that can use a shock absorber.

[Structure of the invention]

In order to achieve the above-mentioned object, in this invention, a bell crank of a link mechanism is rotatably supported on a swing arm, and one end of this bell crank is used for the road force of the swing arm, and the other end is used as an abbreviation for the swing arm. The one end of the bell crank extends downwardly and communicates with the vehicle body frame through a compression rod, and one end of a shock absorber is connected to the other end of the bell crank. The other end of the container is connected to the vehicle frame within the frame loop.

〔Example〕

An embodiment of the suspension system according to the present invention will be described in detail below.

FIG. 1 is a conceptual diagram of a vehicle body frame IO showing a suspension system of the present invention, and particularly shows a vehicle body frame used for an off-road motorcycle that travels on rough terrain.

This body frame 10 includes the main members constituting the body frame IO, namely the down tube 12, the bottom frame 14, the rear frame 16, 18, and the bottom frame 14 in the frame loose interior 22 formed by the tank rail 20 and the like. It is equipped with a double engine 24. On the other hand, one end of a swing arm 30 that supports a rear wheel 28 on a pivot 26 is supported on the rear frame 16 of the vehicle body frame 10, and this swing arm 30 is swingable about the behind 26.

On the other hand, on the pivot 26 side of the swing arm 30, a bell crank 32 is rotatably supported by a shaft 34. Note that this shaft 34 is supported by a bracket 30a arranged on the upper surface of the swing arm 30. On the other hand, one end 32a of the bell crank 32 extends by a predetermined distance from the road force of the swing arm 30, and the other end 32b extends below the swing arm 30 so that the swing arm 30 also projects. ing. Also, one end 32% of the bell crank 32 is connected to a pair of compression rods 38,400 by a shaft 36, as shown in FIG.
0a is rotatably supported. And these compression rods 38, 40 (7) each other end 38b, 40
b are respectively supported via shafts 44 and 46 on cross vibes 42 which are disposed across the rear frames 16 and 16. Note that the shafts 4' and 46 are each supported by brackets 48 fixed to the cross pipe 42. Further, as shown in FIG. 1, one end 50a of a buffer 50 is connected to a pin 52 at the other end 32b of the bell crank 32.
The other end 5 of this buffer 50
0bc, a bell crank 32 and a compression rod 38.
40 constitutes a link mechanism 58.

According to the configuration described above, as shown in FIG.
Since the other end 50b of 0 is supported below the tank rail 20 in the frame loop 22, the shock absorber 50
The center of gravity 60 of the vehicle body located behind the cylinder block 24a of No. 4 is as close as possible. In addition, the buffer 50
the tank rail 20 in the frame loop 22.
A shock absorber 5 is installed between the end 32b of the bell crank 32 and the one end 32b of the bell crank 32 projecting below the swing arm 30.
0, a buffer with a long cushion stroke can be used.

In FIG. 1, reference numeral 62 is a seat rail, 64 is a sub-rail that supports the seat rail 61, 66 is a fuel tank,
68 is a sheet. Also, a carburetor 70 disposed behind the cylinder block 24a of the engine 24, an inlet hose 72 connected to the carburetor 70, and an air cleaner box 7 connected to the inlet hose 72.
4 is arranged as shown in FIG. 3, which is an AA cross-sectional view of the main part of FIG. There is.

In the above embodiment, a case was described in which the present invention is applied to the body frame 10 of an off-road motorcycle, but the present invention is of course not limited to the above embodiment, and can be applied to the body frame 10 of an on-road motorcycle. In short, any configuration in which both ends of the shock absorber are placed between a point within the frame loop and one end of the bell crank that forms the link mechanism and that protrudes below the swing arm can be used. It may be applied to the body frame of the model.

〔Effect of the invention〕

According to the present invention, the above-described structure allows the shock absorber to be re-adjacent to the center of gravity of the motorcycle, thereby further promoting the concentration of weight, thereby further improving maneuverability and stability. In addition, since it is possible to use a shock absorber with a long cushion stroke, the swing stroke can be set even longer, which makes it difficult for the shock absorber to bottom out, especially for motorcycles suitable for off-road use. can get.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a vehicle body frame showing a suspension system of the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIG. 3 is a cross-sectional view of the main part along line AA of FIG. 1. DESCRIPTION OF SYMBOLS 10... Vehicle body frame, 22... Frame roof inside, 24... Engine, 30... Swing arm, 3
2...Bell crank, 38.40...Compression rod, 50...Buffer, 59...Link mechanism. Applicant Suzuki Motor Co., Ltd. -, Z',...
,,,,,1. il,.

Claims (1)

[Claims] One end of the shock absorber is supported on the vehicle body frame, and
The other end is supported by one end of the bell crank of a link mechanism having a bell crank and a compression rod,
In the rear wheel suspension system for a motorcycle, the vibration of the swing arm supporting the bell crank is absorbed by the shock absorber via the link mechanism, wherein one end of the shock absorber is formed in a portion where the engine is mounted. A rear wheel suspension system for a motorcycle, characterized in that the rear wheel suspension system for a motorcycle is supported on a body frame in a frame loop, and the other end is supported on one end of a bell crank that projects and extends below a swing arm.