JPH0861408A - Flat ring spring - Google Patents

Abstract

PURPOSE: To produce force distributed uniformly in the whole directions by forming a cold-rolled and cold-finished thin plate into a flat ring only by cutting, and letting the ring have a spring action to obtain the flatness with high accuracy in the inner and outer peripheral edge parts. CONSTITUTION: As a working process, a cold-rolled and cold-finished thin plate is formed into a flat ring by only cutting. Press working is not performed, and bending is also not conducted. The flatness of the inner and outer peripheral edge parts can be obtained with high accuracy, and a spring action is provided. The attached drawing shows a general perspective view of a flat ring spring 1 and an example where the flat ring spring 1 is used. A stepped shaft 2 is inserted in the flat ring spring 1 with the stepped part locked on the inner peripheral part, load is applied thereto, and the outer peripheral edge of the flat ring spring 1 is born on a base 3 in such a manner as to be freely supported. Thus, abnormally high flatness can be obtained, and a spring characteristic and load can be shown by a simple linear expression of deflection amount, so that if the deflection amount is decided and the spring is built in, a required load can be easily obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing spring which requires highly accurate flatness on the inner and outer peripheral edges, and more particularly to an improvement of a disc spring obtained from a cold-rolled thin plate.

[0002]

2. Description of the Related Art As a typical technique of a conventional disc spring, there is a method of cold-pressing a cold-rolled thin plate to form a disc spring.

[0003]

When a cold-rolled thin plate is cold-pressed to form a disc spring, the plastic deformation rate varies due to the anisotropy inherent in the material, and the disc spring inside and outside It is impossible for the peripheral portion to exhibit the correct flatness. This is the rolling direction of the rolled metal material and 90 ° with it.
It is caused by the difference in the plastic deformation rate such as bending between the different directions. Therefore, it is difficult to obtain highly accurate flatness on the contact surfaces of the inner and outer peripheral edges of the pressed disc spring, and as a result, waviness like a saddle of a horse is usually generated as shown in FIG. Therefore, it is difficult to accurately position on the mounting seat surface. Therefore, in order to solve this point, for example, in the invention disclosed in Japanese Patent Laid-Open No. 5-172171, it is proposed to form a bent portion having a width at the outer peripheral edge of the disc spring into an annular shape as shown in FIG. are doing. However, even then, the flatness at the inner and outer peripheral edges has not been obtained with a high accuracy of several μm. Therefore, it was impossible to generate a force in which the inner and outer peripheral edges were uniformly distributed with the same force in all directions.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a disc spring capable of obtaining a flatness at the inner and outer peripheral edge portions of a circular disc spring with high accuracy and producing a force uniformly distributed in all directions. .

[0005]

According to the present invention, a cold-rolled polished thin plate is formed into a flat plate annular shape only by cutting, and the flatness of the inner and outer peripheral edge portions is obtained with high accuracy and a spring action is provided. Is a flat ring spring. Also, a plurality of cuts may be provided on the inner circumference of the flat plate ring to reduce the spring constant. However, in any case, bending is not performed without pressing.

[0006]

As is well known, the Belleville spring has a characteristic that the load P is expressed by a cubic expression of the deflection amount δ, but the flat ring spring of the present invention is, for example, an outer peripheral free support, an inner peripheral ring-shaped load, and a load P. The bending amount δ has a characteristic that it is determined by a simple linear expression.

[0007]

Embodiments will be described with reference to the drawings. FIG. 1 is a perspective view of a flat ring spring 1 according to an embodiment of the present invention. An example of its use is shown in FIG. The stepped shaft 2 is locked to the inner peripheral portion of the flat ring spring 1 by applying a load to the flat ring spring 1 on the base portion 3.
This is an example of use in which the outer peripheral edge of is freely supported.
Further, FIG. 3 shows an embodiment in which six notches 4 are provided on the inner peripheral edge portion. This is also used similarly to the usage example shown in FIG.

[0008]

EFFECTS OF THE INVENTION Since the flat ring spring of the present invention is not bent or the like, heat treatment for removing stress is unnecessary, and the seating surface (inner and outer peripheral edge portions) is different from the conventional example. It does not warp in a saddle shape and its flatness is not obstructed. Therefore, a very high flatness can be obtained. Spring characteristic is load P
Is expressed by a simple linear expression of the bending amount δ, so that the necessary load can be easily obtained by determining the bending amount and incorporating the spring.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of a flat ring spring of the present invention.

FIG. 2 is an explanatory view of a usage example of the flat ring spring of the present invention.

FIG. 3 is an overall perspective view of another embodiment of the present invention.

FIG. 4 is an explanatory diagram of a problem of a conventional spring.

FIG. 5 is an overall perspective view of the prior art.

[Explanation of symbols]

 1 Flat ring spring 2 Stepped shaft 3 Base part 4 Notch

Claims (2)

[Claims] 1. A flat ring spring, wherein a cold-rolled polished thin plate is formed into a flat plate annular shape only by cutting, and the flatness of the inner and outer peripheral edges is obtained with high precision and a spring action is provided. 2. The flat ring spring according to claim 1, wherein a plurality of cuts are provided on the inner circumference of the flat plate ring.