JPH0253686A - Shock absorber for bicycle - Google Patents

Abstract

PURPOSE:To easily further surely assemble a bicycle shock absorber to an axle by mounting a spring means to be interposed between a link and a bracket and fixing the link, arranged in both ends of the axle, by an axle-tightening screw, provided in the link, to the axle. CONSTITUTION:A belleville spring 13 is mounted interposing between right and left links 3 and brackets 4. An axle 2, placed in a condition that a tire is fixed by a nut 8, is fixed by an axle-tightening thread 9 to the link 3. Accordingly, when the axle 2 is mounted to the link 3, it is urged by the belleville spring 13 in a direction of holding the tire, holding a contact condition with an internal wall surface 4A of each bracket 4, so that under this condition, when the axle 2 is fixed to the link 3, both the links 3 and the axle 2, being integrally built, are disabled from moving to both the right and left in a direction of the axle. Accordingly, a bicycle shock absorber is easily further surely built in the axle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a shock absorber for a two-wheeled vehicle in which a wheel and a shock absorber outer cylinder are connected by a link.

(Prior art) As a shock absorber for two-wheeled vehicles, the shock absorber outer tube and the axle are connected by a link, and the link moves even in response to small vibrations before the shock absorber starts operating. A shock absorber which absorbs vibrations by means of cushion rubber in contact with the links was developed by the applicant, for example, in W. Kosho 62.
It has been proposed as No.-37649.

This is constructed as shown in FIGS. 4 and 5.

, 1 is a 70-ton actor tube (shock absorber outer cylinder), and the axle 2 is the tip of a link 3 that is rotatably supported by and 75 with respect to a bracket 4 attached to the outer tube 1. connected to.

The link 3 is formed in an L-shape, and a short piece 3A that supports the axle 2 comes into contact with a cushion rubber 6 attached to the bottom surface of the outer tube 1, while a short piece 3B that extends along the outer tube 1 contacts the cushion rubber 6 attached to the bottom surface of the outer tube 1. A stopper 7 attached to the outer tube 1 is in contact with the side surface of the outer tube 1.

When vibrations are input from the road surface while driving, the front 7 auger expands and contracts in response.For example, the compression side load from the axle 2 causes the link 3 to move counterclockwise in the figure, centering on the pin 5. The cushion rubber 6 is rotated to compress the cushion rubber 6 before being transmitted to the lower surface of the outer tube 1. As a result, the 70-ton 7-year-old moves in the compression direction, but when the vibration is small, the front 7-ton 7-year-old moves in the compression direction.
However, in this case, the cushion a (rubber 6 is compressed and deformed to absorb minute vibrations).

In response to the extension load, the link 3 rotates in the opposite direction to the above, and the stopper 7 is pressed against the outer tube 1 and absorbs the vibration while compressing it. The ride comfort against vibrations can be improved.

(Problem to be Solved by the Invention) By the way, the link 3 and the axle 2 are specifically attached as shown in FIG. 5.

The axle 2 is inserted into the link 3 which is rotatably supported by the bracket 4 by the pin 5 so as to pass through the axle hole of the tire (not shown), and the nut 8 is screwed onto the end of the axle 2.
Tighten to fix the tire position. The slit formed at the tip of the short piece 3A of the link 3 is provided with an axle tightening screw 9 which is screwed together from the orthogonal direction, and by tightening this, the axle 2 and the left and right links 3 are connected.

In this case, a gap is created between both sides of the link 3 and the bracket 4 that sandwiches it in order to support the link 3 freely, but this allows the axle 2 to freely move left and right by the gap. do.

This movement of the axle 2 is manifested as movement of the tires while the vehicle is running.

In order to prevent the tire from moving left and right, it is possible to eliminate the gap between the link 3 and the bracket 4, but from the viewpoint of supporting the link 3 freely and from the viewpoint of machining accuracy, such an idea is not recommended. Not practical.

Before tightening the axle tightening screw 9, move both links 3 inward or outward until they come into contact with the inner surface of the bracket 4, and if tightened in this state, the axle 2 will not move in either direction. However, if such an assembly method is adopted, it is quite time-consuming to implement, the work efficiency is poor, and it is also difficult to assemble to ensure that the amount of movement is zero.

The present invention was proposed to solve such problems.

(Means for Solving the Problems) Therefore, the present invention provides a structure in which a link is rotatably supported on a bracket provided on a shock absorber outer cylinder, and a cushion rubber for cushioning is interposed between the link and the outer cylinder. In addition, in a shock absorber for a two-wheeled vehicle in which both ends of an axle are supported by left and right links, a spring means is provided between the link and the bracket to bias the link outward or inward in parallel with the axle until it comes into contact with the inner surface of the bracket. The links placed at both ends of the axle are fixed to the axle using axle tightening screws provided on the links.

(Operation) Therefore, when the link is attached to the bracket, the link is biased by the spring means and comes into contact with the inner wall surface on the inside or outside of the bracket. If the axle is fixed to the link in this state, both the links and the axle are integrated, and movement in either direction is prevented by contacting the inner wall surface of the bracket in the axle direction.

(Example) FIG. 1 shows an embodiment of the present invention.

The left and right links 3 are supported by pins 5 and are freely rotatable with respect to the bracket 4. The pin 5 is provided so as to pass through a bearing 12 in a support hole 11 formed in the link 3.

In this embodiment, the left and right links 3 are urged inwardly (centerward) parallel to the axle 2, respectively.
A disc spring 13 as a spring means is interposed between the link 3 and the bracket 4. The disc spring 13 is inserted through the pin 5, and a washer 14 is applied to the end. Therefore, both links 3 are in contact with the inner wall surface 4A on each inner side (towards the tire center) of the bracket 4.

The axle 2 is fixed to the link 3 by an axle tightening screw 9, with a tire (not shown) fixed by a nut 8.

In this way, when attaching the axle 2 to the link 3,
The link 3 is biased by the disc spring 13 in the direction of sandwiching the tire and maintains contact with the inner wall surface 4A of each bracket 4. In this state, insert the axle 2 through the link 3 and tighten the axle tightening screw. If the link 3 and the axle 2 are fixed by tightening the link 9, the left and right links 3 and the axle 2 are integrally connected, and the axle cannot be moved to the right or left in the axle direction.

This means that by placing the disc spring 13 inside each link 3,
The same effect can be achieved by bringing the link 3 into contact with the outer inner wall surface 4B of the bracket 4.

When attaching the link 3 to the bracket 4 in this way, the pin 5 is biased in the axial direction by the countersunk spring 13 in advance, so that the positioning of the link 3 in the axle direction is particularly difficult when the axle 2 and the link 3 are connected. Even without doing so, the axle 2 can be held without shaking in the axial direction, and the tires can be prevented from moving to the left or right while driving.

To explain another embodiment shown in FIG.
To prevent dust from entering the support part of the link 3
An annular groove 15 is formed on the outside of the support hole 11, a dust seal 16 is interposed in the annular groove 15, and the coned disc spring 13 is covered from the outside, so that the flange part covers the outer periphery of the dust seal 16. 17 is assembled. Dust cap 16 and guest seal 17
are provided on both sides of the link 3 to prevent dust from entering the bearing 12 portion from the outside.

Further, in this embodiment, washers 14 are interposed on both sides of the link 3, and the contact pressure between the link 3 and the bracket 4 can be adjusted by adjusting the number of washers 14.

FIG. 3 is a characteristic diagram showing the relationship between the load and displacement of the link 3, which largely depends on the elastic deformation characteristics of the cushion rubber 6 to which the load is transmitted from the axle 2 through the link 3. . This load displacement characteristic has hysteresis as shown in the figure due to the deformation characteristic of the cushion rubber when the load fluctuation is relatively rapid.

This hysteresis is approximately constant if the load e property of the cushion rubber is constant, and it is difficult to change it.

However, this hysteresis is also affected by the frictional force of the sliding portion of the link 3. That is, the hysteresis changes due to the frictional force of the sliding portion caused by the disc spring 13 interposed between the link 3 and the bracket 4. As this sliding friction force ΔF increases, the resistance in the direction of movement increases,
The hysteresis change width F increases.

This hysteresis acts as a damping force against the movement of the link 3. Therefore, by changing the number of disc springs 13 and adjusting the sliding friction force ΔF, it is possible to variably control the damping force against the movement of the link 3. It becomes.

(Effects of the Invention) As described above, according to the present invention, since both links are biased outward or inward in the axial direction of the axle by the spring means, the links are attached to the plaque at the stage of installing the axle. The axle, which is in contact with the inner wall surface of the tire and fixed with the axle tightening screw, is prevented from moving in the left-right direction, and the tire can be reliably prevented from moving left-right. Furthermore, since the links are secured in advance by spring means, the axle can be assembled easily and reliably.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of f51 of the present invention, Fig. 2 is a sectional view showing a second embodiment, and Fig. 13 is a sectional view showing the load of the link.
Characteristic diagram showing displacement characteristics, Figure 4 is a side view showing a conventional example,
FIG. 5 is also a sectional view thereof. 1... Outer tube, 2... Axle, 3... Link, 4... Bracket, 4 A, 4 B... Inner wall surface, 5... Bin, 6... Cushion rubber, 7 ...
Stopper, 9... Axle tightening screw, 11... Support hole,
13... disc spring. Fig. 2 - Main shaft 3 - Link 4 Fragrid 4A, 4B Inner 9 surface 5 - σノ911 music return nji 11 - Support hole 13 No. 2 No. 4 No. 5 ←↑rII11

Claims (1)

[Claims] A link is rotatably supported on a bracket provided on the outer cylinder of the shock absorber, and cushion rubber for cushioning is interposed between this link and the outer cylinder, and both ends of the axle are supported by a pair of left and right links. In the shock absorber for two-wheeled vehicles, spring means is interposed between the link and the bracket to bias the link outward or inward parallel to the wheel until it comes into contact with the inner surface of the bracket, and the link is disposed at both ends of the axle. A shock absorber for a two-wheeled vehicle, characterized in that the shock absorber is fixed to a wheel with a wheel tightening screw provided in the link.