JPH1163066A - Shock absorber externally inserted on compression coil spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce lateral force on a compression coil spring externally inserted on a shock absorber. SOLUTION: For this absorber, the winding diameter of the terminal on the side of the lower sheet 4 of a compression coil spring 5 is gradually reduced and the lower sheet 4 is formed in an inversely conical shape with the terminal having the contact length to be gradually greater as the compression coil spring 5 is contracted, or the winding diameter of the terminal on the side of the lower sheet 4 of the compression coil spring 5 is gradually increased and the lower sheet 4 is formed in a conical shape with the terminal having the contact length to be gradually greater as the compression coil spring 5 is contracted, so that the effective winding number of the compression coil spring 5 can be changed as it is contracted and elongated, thus to reduce lateral force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression coil spring extrapolation shock absorber used as a suspension system of a motor vehicle, and more particularly to a force (hereinafter referred to as a lateral force) acting on a compression coil spring in a direction perpendicular to its coil axis. The present invention relates to a compression coil spring extrapolation shock absorber that prevents the shock absorber from being operated.

[0002]

2. Description of the Related Art In recent years, the design stress of suspension coil springs has increased and the pitch angle has increased due to the practical use of high-strength spring steel and the improvement of processing techniques such as special shot peening in order to reduce the weight and size. As a result, lateral force acts even in the case of parallel compression that displaces the spring seat only in the direction of the coil axis, and when extrapolated to the shock absorber, the lateral force causes twisting between the absorber rod and the absorber tube, Riding comfort may be degraded and the life of the absorber may be shortened.

[0003] The inventors of the present invention have confirmed through experiments and analysis by the finite element method that when the effective number of turns is changed by expansion and contraction of the compression coil spring, the lateral force decreases.

[0004]

An object of the present invention is to reduce the lateral force acting on a compression coil spring extrapolated to a shock absorber.

[0005]

Means for Solving the Problems, Functions and Effects As means for solving the above-mentioned problems, the invention of claim 1 is to gradually reduce the winding diameter of the end portion of the compression coil spring on the lower seat side, and The lower sheet has a mortar shape in which the contact length of the terminal gradually increases with the contraction of the compression coil spring, and the invention of claim 2 increases the winding diameter of the end of the compression coil spring on the lower sheet side. In addition, since the lower sheet has a conical shape in which the contact length of the terminal gradually increases with the contraction of the compression coil spring, the effective number of turns can be changed by expansion and contraction of the compression coil spring, thereby reducing the lateral force. There is an effect that can be.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1, 2 and 3, reference numeral 1 denotes a shock absorber. An absorber tube 2 is connected to a lower arm c supporting a wheel b, and an absorber rod 3 is attached to a flange of a vehicle body a. Lower sheet 4 and absorber rod 3 fixed to 2
A compression coil spring 5 is mounted between upper sheets (not shown) fixed to the upper side.

[0008] As shown in FIG.
The winding diameter of the terminal portion on the lower sheet 4 side gradually decreases toward the tip, and the lower sheet 4 has a mortar shape in which the contact length of the terminal gradually increases as the compression coil spring 5 contracts. From the compression coil spring 5
The effective number of turns changes with the expansion and contraction of the spring, the lateral force acting on the compression coil spring 5 can be reduced, and the ride comfort can be improved, and the life of the shock absorber can be extended.

FIG. 4 shows another embodiment of the present invention, in which the winding diameter of the end of the compression coil spring 5 on the side of the lower sheet 4 is gradually increased, and the lower sheet 4 is moved with the contraction of the compression coil spring 5. Since the contact length of the terminal is gradually increased, the effective number of turns changes with the expansion and contraction of the compression coil spring 5, so that the lateral force can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a mounted state of a shock absorber.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged plan view of a lower seat and a compression coil spring.

FIG. 4 is a cross-sectional view of another embodiment.

[Explanation of symbols]

 1: Shock absorber 2: Absorber tube 3: Absorber rod 5: Compression coil spring 4: Lower seat

Claims (2)

[Claims] 1. A compression coil spring extrapolation shock absorber in which a compression coil spring is mounted between an upper sheet fixed to an absorber rod and a lower sheet fixed to an absorber tube, a terminal portion of the compression coil spring on the lower sheet side. Characterized in that the diameter of the lower sheet is gradually reduced, and the lower sheet is formed in a mortar shape in which the contact length of the terminal gradually increases with the contraction of the compression coil spring. 2. A compression coil spring extrapolation shock absorber in which a compression coil spring is mounted between an upper sheet fixed to an absorber rod and a lower sheet fixed to an absorber tube, an end of the compression coil spring on the lower seat side. Characterized in that the winding diameter of the lower sheet is gradually increased and the lower sheet is formed in a conical shape in which the contact length of the terminal thereof gradually increases as the compression coil spring contracts.