JPH08175455A - Suspension structure of bicycle - Google Patents

Abstract

PURPOSE: To ensure the stability and safety of a bicycle by connecting a seat stay tube end with a seat tube rotatably through a link mechanism and interposing a rotary type twist damper on the connection part of the seat tube with the link mechanism. CONSTITUTION: One end of a chain stay 4 is connected to the hanger lag 2 of a seat tube 1 lower end through a rotary pivot 3 and the other end of the chain stay 4 is connected to one end of a seat stay tube 5 and also its other end is connected to the nearly center part of the seat tube 1 through a rotatable link mechanism 10. A rotary type twist damper 11 is interposed on the connection part 10a of the seat tube 1 with the link mechanism 10. Thereby, sure response can be carried out for the vertical movement of a rear wheel 7 and a triangle frame structure favorable to rigidity dynamically can be ensured. Therefore, the stability and safety of a bicycle can be ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle suspension structure, and more particularly, to a bicycle suspension structure capable of reliably responding to vertical movement of a rear wheel and obtaining a sufficient cushioning effect. is there.

[0002]

2. Description of the Related Art Conventionally, as a damper structure (buffer structure) of a bicycle rear suspension, a damper structure composed of a hydraulic system, a hydraulic-pneumatic (gas) system and a metal coil spring, or a hydraulic system Instead, a damper unit that utilizes the compression characteristics of rubber and that is combined with a metal coil spring is widely used.

Further, a rubber mount-like usage method utilizing the compression characteristic of rubber, that is, a cushioning function is also used. When such a damper unit is applied to the rear suspension of a bicycle, it is often devised to smoothly move the rear wheel up and down by using a link mechanism or the like. For example, as a structure of a rear suspension using a rubber mount as shown in FIG. 3, one end of a chain stay 4 is connected to a hanger lug 2 provided at a lower end of a seat tube 1 via a rotary pivot 3 and the chain stay 4 The one end of the seat stay tube 5 is connected to the other end of the seat tube, and the other end is connected to the substantially central portion of the seat tube 1 by a buffer mechanism 6 with a rubber interposed to form a triangular frame.

This structure basically acts as a stopper against the upward movement of the rear wheel 7, and is thought to have a kind of buffering effect, and is suitable for a relatively short stroke. Further, the spring effect due to the restoring force of the rubber is used for the downward movement of the rear wheel 7.

[0005]

However, as is apparent from FIG. 3, the other end side of the seat stay tube 5 on the side of the seat tube 1 is adhesively embedded in the rubber mount of the cushioning mechanism 6, so that by any chance. If the integral joint is damaged due to damage to the rubber, the load will be shared only by the chain stay 4, so there is a concern that the bicycle may become extremely unstable. .

The present invention has been devised in view of the above conventional problems, and reliably responds to the vertical movement of the rear wheel, and sufficiently copes with a relatively large vertical displacement. In addition, since the triangular frame structure that is mechanically advantageous in terms of rigidity can be secured, the weight of the rear frame itself can also be reduced, and even if the adhesive joint of the torsion damper is broken, there is a problem in running the bicycle. The purpose is to provide a bicycle suspension structure with high safety.

[0007]

In order to achieve the above object, the present invention connects the other end of the seat stay tube and the seat tube via a rotatable link mechanism to connect the seat tube and the link mechanism. The gist is that a rotary type torsion damper is interposed in the connecting portion.

The rotary type torsion damper is constructed by integrally fixing a rubber bush between an inner cylinder and an outer cylinder, and the torsion damper is attached to a bracket fixed to the seat tube. The inner cylinder is fixed, one end of the link of the link mechanism is fixed to the outer cylinder, and the attachment position of the rotary pivot is made closer to the center of the hanger lug for connection.

[0009]

The present invention is configured as described above, and connects the other end of the seat stay tube and the seat tube via the rotatable link mechanism, and connects the seat tube and the link mechanism to the connecting portion. Since it is configured with a rotary type torsion damper interposed, it reliably responds to the vertical movement of the rear wheel and can sufficiently respond to a relatively large vertical movement displacement. Even if the rubber bush adhered to the cylinder by vulcanization is peeled off, there is no problem in running the bicycle without the effect of the suspension, and the stability and safety of the bicycle are extremely excellent.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a front view of a bicycle body embodying the present invention, where 1 is a seat tube for supporting a seat 1a, 7 is a rear wheel, 8 is a front wheel, and 9 is a handle.

One end of a chain stay 4 is connected to a hanger lug 2 provided at the lower end of the seat tube 1 via a rotary pivot 3, and one end of a seat stay tube 5 is connected to the other end of the chain stay 4. At the same time, the other end is connected to a substantially central portion of the seat tube 1 via a rotatable link mechanism 10, and a rotary torsion damper 11 is provided at a connecting portion 10a between the seat tube 1 and the link mechanism 10. The triangular frame structure, which is mechanically advantageous in terms of rigidity, is secured by interposing.

The rotary type torsion damper 11 is shown in FIG.
As shown in FIG. 3, a rubber bush 14 is integrally fixed between the inner cylinder 12 and the outer cylinder 13 by vulcanization adhesion or the like, and the inner cylinder 12 of the torsion damper 11 is attached to the bracket 15 fixed to the seat tube 1. Is fixed via the angular shaft 16, one end of the link 17 of the link mechanism 10 is fixed to the outer cylinder 13, and the other end of the link 17 is fixed to the other end of the seat stay tube 5 via a pin 18. Are rotatably connected.

It is preferable that the rotary pivot 3 is attached at a position close to the center of the hanger lug 2. Since the present invention is configured as described above, the link mechanism 10 and the rotary-type torsion damper 11 reliably respond to the vertical movement of the rear wheel 7 and respond to a relatively large vertical movement. The rubber bush 1 is vulcanized and bonded between the inner cylinder 12 and the outer cylinder 13.
Even if 4 is peeled off, there is no problem in running the bicycle without the effect of the suspension, and the stability and safety of the bicycle can be secured.

[0014]

As described above, according to the present invention, the other end of the seat stay tube and the seat tube are connected via a rotatable link mechanism, and the rotary portion is connected to the connecting portion between the seat tube and the link mechanism. Since a torsion damper is interposed, it reliably responds to the vertical movement of the rear wheel, can sufficiently respond to the displacement of a relatively large vertical movement, and has a triangular frame structure that is mechanically advantageous in terms of rigidity. Since the rear frame itself can be lightened, there is no problem in running the bicycle even if the adhesive joint of the torsion damper is broken, and the stability and safety of the bicycle can be secured. effective.

[Brief description of drawings]

FIG. 1 is a front view of a bicycle body embodying the present invention.

FIG. 2 is an enlarged cross-sectional view of a rotary type torsion damper.

FIG. 3 is a front view showing a conventional bicycle suspension structure.

[Explanation of symbols]

1 Seat Tube 2 Hanger Lug 3 Rotating Pivot 4 Chain Stay 5 Seat Stay Tube 7 Rear Wheel 10 Link Mechanism 11 Torsional Damper 12 Inner Cylinder 13 Outer Cylinder 14 Rubber Bushing 15 Bracket 16 Square Shaft 17 Link

Claims (3)

[Claims] 1. An end of a chain stay is connected to a hanger lug provided at a lower end of a seat tube via a rotary pivot, and one end of a seat stay tube is connected to the other end of the chain stay, and the other end side is seat tube. In a suspension structure for a bicycle, which is connected to the substantially central portion of the above to form a triangular frame structure, the other end of the seat stay tube and the seat tube are connected via a rotatable link mechanism, and the seat tube is linked to the seat tube. A bicycle suspension structure characterized in that a rotary type torsion damper is interposed in the connecting portion with the mechanism. 2. The rotary type torsion damper is configured by integrally fixing a rubber bush between an inner cylinder and an outer cylinder, and the torsion damper is attached to a bracket fixed to a seat tube. The bicycle suspension structure according to claim 1, wherein the inner cylinder is fixed, and one end of the link of the link mechanism is fixed to the outer cylinder. 3. The bicycle suspension structure according to claim 1, wherein the mounting position of the rotary pivot is close to the center of the hanger lug for connection.