JPS6146268Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the spring load adjustment mechanism of a hydraulic shock absorber used in the rear action of a two-wheeled vehicle.

For example, in a hydraulic shock absorber used as a rear suspension for a two-wheeled vehicle, the set load of a coil spring is adjusted for the purpose of adjusting the vehicle height or changing the shock absorbing characteristics.

Adjustment of the set load of the coil spring is accomplished by an adjustment mechanism attached to the shock absorber, and this type of adjustment mechanism has a wavy cam surface with different depths that receives a spring support on the top surface. A cylindrical adjuster is slidably and rotatably fitted to the outer periphery of the cylinder, and the adjuster is rotated to change the engagement position of the cam surface provided thereon with the stopper fixed to the outer periphery of the cylinder. The set length of the coil spring is changed by moving the adjuster up and down.

However, in such an adjustment mechanism, the stopper that abuts and engages the cam surface of the adjuster is welded to the outer periphery of the cylinder, resulting in disadvantages such as adverse thermal effects such as distortion inside the cylinder.

Furthermore, since the adjustment mechanism was directly exposed on the outer surface of the shock absorber, there was a problem in that the aesthetic appearance of the shock absorber was impaired.

The present inventor has devised the present invention in view of the above-mentioned disadvantages of such a spring load adjustment mechanism, and to effectively solve these problems.

The object of the present invention is to provide a cylindrical adjusting case which is fixed by engaging a stopper protruding from the inner circumference of the lower part of the shock absorber into a concave groove formed in the lower mounting member of the shock absorber, and an upper part of the case. an adjuster which is fitted onto the outer periphery of the cylinder and whose cam surface is engaged with the stopper, and which abuts the upper surface of the adjuster so as to be able to rotate integrally with the adjuster, and whose side wall holds the adjuster case and the adjuster out of the way. The hydraulic system is constructed of a spring holder that is covered by a cover that covers both sides, thereby preventing adverse thermal effects inside the cylinder of the shock absorber and improving the external appearance of the shock absorber. The present invention provides a spring load adjustment mechanism for a shock absorber.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a half-cut sectional view of a hydraulic shock absorber equipped with an adjustment mechanism according to the present invention, and FIG. 2 is an exploded perspective view of the adjustment mechanism.

In the hydraulic shock absorber 1 shown in FIG. 1, 2 is a cylinder, and a piston rod 3 is inserted into the cylinder 2 from above, and the lower end of the rod 3 is fitted to the inner circumference of the cylinder 2 so as to be able to slide vertically. piston 4
The piston 4 is provided with a valve 5 that generates a damping force.

At the inner circumference of the upper end of the cylinder 2, there is a guide 6 and an oil seal 7 which are in sliding contact with the outer circumference of the piston rod 3.
The lower end of the cylinder 2 is closed with a lower mounting member 8, and hydraulic oil is sealed inside the cylinder 2. In addition, 9 in the figure is a rebound spring.

Further, an upper mounting member 10 is fixed to the upper end of the piston rod 3, and a stop lever 11 is provided on the lower surface of the mounting member 10.

On the other hand, a groove 8 is formed on the upper surface of the lower mounting member 8.
a, 8a are formed to face each other, and these grooves 8
stoppers 12a, 12a that protrude oppositely from the inner circumference of a cylindrical adjusting case 12 as shown in FIG. Fixed on the side.

The cylinder 2 above this adjustment case 12
As shown in FIG. 2, a cylindrical adjuster 13 having a cylindrical shape and having a cam surface 13a having different depths at its lower end and a plurality of notches 13c in an upper flange 13b is slidable and rotatable on the outer periphery. The adjuster 13 is positioned by the abutting engagement of its cam surface 13a with the stoppers 12a, 12a.

Further, a cylindrical spring receiver 14 is slidably fitted on the outer periphery of the cylinder 2 above the adjuster 13, and the upper surface of the spring receiver is provided with a claw 14a that engages with the notch 13c of the adjuster. , the spring receiver 1
The side wall 14b of No. 4 constitutes a cover that covers the adjuster case 12 and adjuster 13 from the outside.

Note that a plurality of tool holes 14c are formed in the side wall 14b.
is provided.

The spring receiver 14 is brought into elastic contact with the upper surface of the adjuster 13 by the elastic force of a coil spring 15 stretched between the spring receiver 14 and the upper mounting member 10. The upper half of the coil spring 15 has its upper end circumference connected to the upper mounting member 1.
It is covered with a cover 16 fixed to the top.

The set load of the coil spring 15 is adjusted by rotating the spring receiver 14. That is,
When the spring receiver 14 rotates, the adjuster 13 rotates integrally, and the stopper 12 of the cam surface 13a provided thereon rotates.
a, 12a changes, the adjuster 13 moves up and down on the outer periphery of the cylinder 2 together with the spring receiver 14, and the vertical movement of the spring receiver 14 causes the coil spring 15 to move upward and downward.
The set length of the spring 15 changes, and as a result, the set load of the spring 15 is adjusted arbitrarily.

In the above, the stoppers 12a, 12a are fixed to the outer peripheral side of the cylinder 2 by engagement with the grooves 8a, 8a provided in the lower mounting member 8,
Since the fixing of a and 12a does not involve any heat, the inside of the cylinder 2 will not be adversely affected by heat.

The adjuster case 12 and the adjuster 13 are covered by a side wall 14a of a spring bearing 14.
Since it is not exposed on the outer surface, the aesthetic appearance of the shock absorber 1 is not marred.

As is clear from the above description, according to the present invention, there is provided a cylindrical adjustment case that is fixed by engaging a stopper protruding from the inner circumferential portion of the groove formed in the lower mounting member of the shock absorber; an adjuster that fits on the outer periphery of the cylinder above the case and has a cam surface provided thereon that engages with the stopper; Since the adjustment mechanism is constructed from the spring receiver which constitutes the covering cover, the hydraulic shock absorber is not affected by adverse thermal effects, and the appearance of the hydraulic shock absorber can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a half-cut sectional view of a hydraulic shock absorber, and FIG. 2 is an exploded perspective view of a spring receiving load adjustment mechanism. In the drawing, 2 is the cylinder, 8 is the lower mounting member, 8
a is a groove, 12 is an adjuster case, 12a is a stopper, 13 is an adjuster, 13a is a cam surface, 1
4 is a spring holder, and 15 is a coil spring.

Claims (1)

[Scope of utility model registration request] A mechanism attached to a hydraulic shock absorber comprising a piston slidably fitted into a cylinder, an open end of the cylinder closed by a lower mounting member, and a coil spring interposed on the outer periphery of the cylinder. A cylindrical adjustment case is fixed by engaging a stopper protruding from the inner circumference of the groove in a groove formed in the mounting member, and the case is slidably and rotatably fitted to the outer circumference of the cylinder above the case. and a cylindrical adjuster formed by abutting and engaging cam surfaces of different depths provided at the lower part of the adjuster with the stopper, and a cylindrical adjuster which is slidably fitted to the outer periphery of the cylinder and which rotates integrally with the adjuster on the upper surface of the adjuster. 1. A spring load adjustment mechanism for a hydraulic shock absorber, comprising a spring receiver movably abutting against each other and whose side wall constitutes a cover that covers the adjuster case and the adjuster from the outside.