JPS58146741A - Spring adjuster of shock absorber - Google Patents

Abstract

PURPOSE:To prevent the generation of local concentration of stress in cam members and obtain stable operation, by tilting each cam surface of a pair of cam members fitted to a main unit and continued to a spring receiver in the axial direction of the main unit and forming said surface to a waveform shape surface contacted to each other. CONSTITUTION:A damper is arranged in a main unit 1, and an inner tube 2 connected to a piston of the damper is protruded upward while spring receivers 6, 5 are provided respectively to upper and bottom parts of the unit 1, then damping action is performed by a spring 7 interposed between these receivers 6, 5. Here a pair of cam members 8, 9 fitted to the unit 1 are provided in the opposite side to a spring receiving face of the receiver 5, and each cam surface 8a, 9a is tilted in the axial direction of the unit 1 to form tilted surfaces to a mutually engageable waveform shape. In this way, a tool is inserted into holes 11, 12 to turn either one of the member 8 or 9, displace the receiver 5 in the axial direction and adjust resilient force of the spring 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock absorber spring III device.

The rear wheels of motorcycles are universally used to reduce the pressure of the spring so that the elastic force of the spring can be adjusted.

One of the ways to adjust it is to install a cam 1141148 on the spring receiver 45 as shown in 4th w, and to make the uneven cam surface of the cam member diagonally installed on the 4th w. There is one in which the integral part 41 is engaged with a fixed stopper 49. In this mechanism, by moving the cam part @4B i, the locking position with the stopper 49 is changed, the vertical position of the cam m@4B is displaced, and the position of the spring receiver 45 is changed by this movement. The length of the compression ring of the spring 47 is changed.

However, according to the above-mentioned mechanism, the stopper 49 comes into contact with the uneven cam surface of the cam arm 48 at a high point, so that there is a problem that the cam arm IB is likely to collapse due to stress concentration. In addition, when the stopper 49 is provided WwL, if their nationally specified positions are even slightly shifted from each other, the cam portion IE449 will receive uneven force, making it more likely to wear out and the spring There is a possibility that support for 47 will become unstable. Further, the stopper 49 is currently fixed to the main body integral 41 by welding, but such welding may cause molten Ill to occur in the cylindrical body.

The purpose of the present invention is to eliminate the drawbacks of the conventional device as described above, and to provide a highly reliable shock absorber that does not cause bending in the cam member for the spring sea bream and supports the spring stably. It is an object of the present invention to provide a spring joint device for a shock absorber that can be operated automatically.

Shock absorber spring 1 according to the present invention that achieves the above object
Ilv! In the I position, a spring bearing supporting a spring provided along the central cylindrical body is disposed movably in the axial direction of the cylindrical body, and a pair of cam members are fitted integrally in series with the spring bearing. The cam surfaces on which the pair of cam III bolts come into contact with each other are inclined in the circumferential direction of the cylinder and in one direction, and the inclined surfaces are provided with uneven surfaces that can be held together. In addition, at least the cam of the spring receiver is rotatable relative to the integral body and movable in the axial direction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a shock absorber for two-wheeled motorcycles equipped with a spring 1llv device according to the present invention.

This IIIIII! 1, numeral 1 is a cylinder constituting the main body, inside of which there is a damper made up of a cylinder containing oil and a piston, and an inner tube 2 connected to the piston protrudes upward. A connection 113 to the rear arm is fixed to the lower end of the W body 1, and a spring receiver 5 is slidably and rotatably fitted onto the cylindrical body above the W body 1, and the upper end of the inner tube 2 is integrally connected to the rear arm. The chain #1i 114 and the spring receiver 6 are each fixed to the frame. Spring receivers 5 and 6
A spring 7 is interposed between the two and has a damping effect.

On the side of the spring receiver 5 opposite to the spring receiving surface, there are provided a pair of cam members 8.9 that fit into the body 1, one of which, cam 118, is attached to the spring receiver 5.
It is integrated with the spring receiver 5, and is slidable and movable integrally with the spring receiver 5. In addition, the local cam part @9 is fitted to the lower end of the integral 1 in a movable manner, and
As shown at 1111211, the clip 10 is used to secure the case downward. The cam surfaces 8L and 9a on which the pair of cam members 8.9 abut each other are inclined with respect to the axial direction of the cylindrical body 1 as a whole, and the inclined surfaces have waveforms that can be secured to each other. Two or more of these generally inclined cam surfaces 8al and 9a, which have a concave and convex shape, are repeated in the shape of a curved blade to form a circular cane.

Further, each of the cam members 8.9 is provided with adjustment tool insertion holes 11.12.

In the above device, when controlling the elastic force of the spring 7, the tool insertion hole 11.12 of the cam member 8.9 mentioned above is
Insert the tool into the ft! while keeping either tool stationary! The cam member 8 or 9 is rotated by the other tool.

By sweeping like this, the cams 8a and 9a of the inclined cane are
slide on each other, and the cam member 8 displaces the axial position of the cylinder 1 with respect to the cam member 9(5). As shown in FIGS. 3(A) and 3(B), by shifting the meshing positions of the cams W8a and 9a, the cam member 8 can be moved at a relative distance from the cam member 9 to the cylinder 1 in one direction. All of E to L
! will be changed. Therefore, this cam 1!
Spring due to axial displacement of $119! ! 5 is displaced in one direction, the pressure length a of the spring 7 changes, and its elastic force is adjusted.

According to the spring tmIf1 device described above, the cam 1108.9 that fits into the cylinder 1 has a cam surface 8 that extends along the circumferential direction of the body and is inclined with respect to one direction! I.

Since the cam members 8 and 9a are in surface contact with each other and the cylindrical body 1 is moved relative to each other in one direction, local stress concentration does not occur in the cam members 8 and 9, and the cam members 8 and 9 are prevented from sagging. Moreover, since the spring receiver 5 is evenly supported in the layer direction of the cylinder body 1 due to the surface contact of the cam surfaces 8a and 9a extending in the circumferential direction, the support of the spring 7 is becomes stable with no wobble as a whole, and (6
〉 Enables reliable spring adjustment. Further, since it is not necessary to use a fixing means such as welding to fix the cam member 9 to the cylindrical body 1, problems such as welding distortion in the cylindrical body 1 are not caused.

In addition, in the above-mentioned embodiment, the cam member 8 is connected to the spring receiver 5.
Although the cam member 8 and the spring receiver 5 are in a relationship of being integrally fixed to each other, the relationship may be such that the cam member 8 and the spring receiver 5 can be separated from each other and simply contact each other. Further, since at least one of the pair of cam members 8, 9 only needs to be rotated, the cam member 9 may be fixed to the cylinder body 1.

As mentioned above, the shock absorber spring ms according to the invention
The device includes a spring receiver that supports a spring provided along a central cylindrical body and is movable in the axial direction of the cylindrical body, and a pair of cam members that fit into the cylindrical body in series with the spring receiver. The cam surfaces on which the pair of cam members come into contact with each other are inclined along the circumferential direction of the cylindrical body and in the axial direction, and the inclined surfaces are formed with uneven surfaces that can be held together. In addition, since at least the cam member on the spring receiving side is rotatable with respect to the cylindrical body and movable in the axial direction, the cam member 111111 is locally moved as in the conventional device shown in FIG. No stress concentration occurs on the cam member, and therefore no sagging of the cam member occurs. In addition, it is possible to provide a shock absorber that allows the spring to be supported in a stable state and has high l'lilj property.

[Brief explanation of the drawing]

FIG. 1 is a front view of a motorcycle I equipped with a spring tensioner 171 device according to the present invention.
FIG. 3(A) is a sectional view of the main parts of the device. (B) is a 871-dimensional view showing the grate-like structure of the cam member of the same main part, and FIG. 4 is a front view of the main part of the conventional device. 1...Cylinder body, 5.6...Spring holder, 7...Spring, 8.9...Cam member, Bikl 9a...
cam surface. □j 1□ m=G223− Fig. 4]

Claims (1)

[Claims] A spring bearing for supporting a spring provided along the cylindrical body of the middle Jt2tl is provided so as to be displaceable in the axial direction of the cylindrical body,
A pair of cam members that are fitted together are provided in series with this spring receiver, and each cam surface where the pair of cams S@ comes into contact with each other is arranged along the direction of the cylinder and inclined with respect to one direction. and a concavo-convex surface that can be held together on the inclined surface thereof, and at least the cam In on the spring receiving side.
111M spring, characterized in that the spring can be automatically moved in the axial direction relative to the cylindrical body.
ll'll equipment.