JP2002276708A - Wave coil spring generating repulsion force toward coil center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave coil spring capable of eliminating side slippage at a contact part of a peak and valley of wave and improving accuracy of a cylindrical long-bodied coil spring by making repulsion force of the wave coil spring generated toward a coil center. SOLUTION: A flat plate surface of a coil part is displaced with inclined into a coil center direction and a facing part of tops of peak and valley of wave is constructed in a dish shape and to get into a contact or close.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wave coil spring formed by coiling a metal leaf spring material corrugated by wave processing so that the peaks and valleys of the wave are in contact with each other. More specifically, the present invention relates to a wave coil spring in which a repulsive force is directed to a coil center.

[0002]

2. Description of the Related Art A wave coil spring is formed by winding a band-shaped metal leaf spring material into a wave shape and winding the coil in the thickness direction of a thin plate.
And Japanese Patent Application Laid-Open No. 9-177852. As shown in FIGS. 1 and 2, a known wave coil spring (20) includes a peak (1) of an adjacent corrugated portion.
And the valley (2) are opposed to each other. The peaks (1) and valleys (2) contact each other with the tops serving as fulcrums, and when a load is applied to both ends of the spring, the bow-shaped portions of the peaks and valleys are bent to obtain a predetermined repulsive force. is there.

[0003]

In the conventional wave spring, as shown in FIG. 2, the plate surface of the coil is at a right angle of 90 degrees to the center axis of the coil, so that the plate surface is formed substantially horizontal. I have. Since the plate surface is horizontal, the reaction force of the coil spring becomes parallel to the center axis of the coil as shown in FIG. 2 (b). In particular, there is a problem that the center of the repulsive force cannot be avoided if the coil has a multi-layer winding and a cylindrical shape or a body length.

[0004] It is an object of the present invention to solve such a problem and to make the repulsive force of the wave coil spring toward the center of the coil so that the contact between the peak and the valley of the wave does not shift and The point is to improve the accuracy of the coil spring having a cylindrical body length.

[0005]

In order to achieve the above-mentioned object, a wave coil spring according to the present invention is provided by forming a metal plate spring material corrugated by wave processing such that the peaks of the wave peaks and valleys face each other. In a wave coil spring obtained by coil winding, while displacing the flat plate surface of each coil portion inclining inward toward the coil center,
It is characterized in that the opposed portions of the peaks and valleys of the wave are configured to be in contact with or close to each other in a dish shape.

Further, the present invention provides a wave coil spring in which a leaf spring material is formed into a cylindrical shape by multi-layer winding.

The wave coil spring having the above structure is
Since each plate surface of the coil is inclined at a small angle inward from horizontal with respect to the center of the coil, the repulsive force of the coil is always in the direction toward the center axis of the coil. For this reason, it is possible to avoid occurrence of lateral displacement at the contact portion between the peak and the valley of the wave.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 3 to 5 show one embodiment of the present invention, in which FIG. 3 is a side view of the entire wave coil spring. 4A is the same plan view, and FIG.
It is sectional drawing of the -B line.

The leaf spring material (10) has a rectangular cross-section that is horizontally long, and a continuous strip is pulled out from one end and subjected to wave processing.
And the valleys 2 are wound so that the tops of the valleys 2 are vertically opposed to each other, and each plate surface of the coil is inclined inward at a smaller angle (θ) than the center of the coil.

The cross-sectional shape of the leaf spring material 10 is a flat rhombus, a horizontally long rectangle as shown in FIGS. 5 (a), 5 (b) and 5 (c).
In addition to a flat oval or the like, an appropriate one can be selected.

The inclination angle (θ) of the plate surface is preferably about 5 degrees.
However, the present invention is not limited to this, and it is desirable to appropriately select the width and thickness of the plate surface, the spring constant, the coil diameter, the coil length, and the like. Due to the inward inclination of the coil plate surface, only the contact portions of the peaks of the peaks 1 and the valleys 2 of the wave are in close contact with each other in a straight line when viewed from the radial direction, and the cross-sectional shape is a dish shape as shown in FIG. It will be. Accordingly, due to the inward inclination of the plate surface, the reaction force applied to the wave coil spring is directed to the center of the coil, so that the lateral displacement that tends to occur in the horizontal direction is prevented as much as possible.

[0012]

As described above, in the wave coil spring of the present invention, since the plate surface of the coil is inclined at a small angle inward from the normal horizontal position with respect to the center of the coil, the repulsive force of the coil spring is always constant. The direction becomes the direction of the coil center axis, and it is possible to reduce the occurrence of lateral displacement at the contact portion between the peak and the valley of the wave. In addition, it is possible to easily obtain a long cylindrical wave coil spring with a large number of turns of the coil.

[Brief description of the drawings]

FIG. 1 is a side view of a conventional wave coil spring.

2A is a plan view of a conventional wave coil spring, and FIG. 2B is a cross-sectional view taken along line AA.

FIG. 3 is an overall side view showing the wave coil spring of the present invention.

FIG. 4 shows a wave coil spring according to the present invention, (a).
Is a plan view, and (b) is a sectional view taken along line BB.

FIGS. 5A, 5B and 5C are views showing an embodiment of the cross-sectional shape of the coil plate surface portion of the wave coil spring of the present invention.

[Explanation of symbols]

 Reference Signs List 1 wave crest 2 wave trough 10 leaf spring material

Claims (2)

[Claims] 1. A wave coil spring obtained by winding a metal leaf spring material (10) corrugated by wave processing such that the peaks of a wave peak (1) and a valley (2) face each other. In addition, the flat plate surface of each coil portion is displaced inwardly in the direction of the coil center, and the opposing portions of the peaks and valleys of the wave are configured to be in contact with or close to each other in a dish shape. Wave coil spring whose characteristic repulsion is directed to the center of the coil. 2. The wave coil spring according to claim 1, wherein the wave coil spring is formed by winding a leaf spring material (10) in a multi-layer winding into a cylindrical shape.