JPH03199727A - Belleville spring - Google Patents

Abstract

PURPOSE:To form a pressure/displacement curve in a linear shape at the time of starting pressurization by setting a slope in the radial direction of a spiral wave pattern to an outside recessed shape. CONSTITUTION:In the case of a belleville spring D in which its spiral wave pattern P, presented as a waveform section from an arbitrary point in the periphery of a material disk center circle 10, is sloped toward the center circle 10, a slope in the radial direction of the spiral wave pattern P is set to an outside recessed shape. Ratio h/l of slope height (h) to length l in the diametric direction, in this spiral wave pattern P, is set to 1/5 or less. When pressing force is applied to an arbitrary point in a surface of this belleville spring D, deflection by the pressing force is transmitted to a total area through the spiral wave pattern P with no unevenness in generated stress, and the spring D is uniformly deflected in the peripheral direction. In this deflecting action, a pressure/displacement curve is obtained in a linear shape at the time of starting pressurization.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc spring that can be deflected uniformly over its entire circumference.

[Conventional technology and its problems]

In Japanese Patent Application No. 63-99143, etc., the present inventors have disclosed that, as shown in FIG.
We have proposed a disc spring D in which the spiral waveform P is inclined toward the central circle 10 (see FIG. 1), and the spiral waveform P is inclined toward the central circle 10.

Since the ripples P have a spiral shape, the disc spring D has uniform rigidity around the circumference, and is deflected uniformly in the circumferential direction without uneven stress.

However, as shown in Fig. 3, the pressure-displacement curve (O: during pressurization, .: during depressurization, see comparative example (broken line)) lacks linearity, and is not smooth, especially at the start of pressurization.
Some diaphragm sensors, in which this type of disc spring is often used, require linearity at the beginning of application.

Therefore, in the present invention, the pressure-displacement curve at the start of pressurization is
To provide a disc spring that is m-shaped! ! Let it be l.

[Means to solve the problem]

In order to solve the above problems, in the present invention, in a disc spring having the above-mentioned spiral ripples and the ripples being inclined toward a central circle, the spiral ripples have an outward concave inclination in the radial direction. It is.

The degree of inclination of the spiral ripples, that is, the ratio Ch/1 of the inclination height h to the radial length l in FIG. 2, is preferably 115 or less, preferably 1/6. This is because if it exceeds 115, the molding pressure for the outwardly facing slope and the inwardly facing slope will be significantly different, making it impossible to manufacture using the current technology when pressing the bottom shape.

In addition, if concentric circular ripples and outer circular ripples are provided, when the ripples are press-formed, the raised distortion that occurs in the center will be absorbed and dispersed in the concentric circular ripples, and the wrinkle-shaped distortion that will occur on the outer periphery will be absorbed and dispersed. is absorbed and dispersed by the outer circular ripples. This absorption and dispersion becomes more effective if the beginning and end of the spiral ripples merge into the eye-shaped ripples.

(Function) When a pressure force is applied to a disc spring configured in this way at any point on its surface, the deflection due to the pressure force is transmitted to the entire area via spiral ripples, and the generated stress is not biased. , is bent uniformly in the circumferential direction, and in this bending action, the pressure-displacement curve becomes linear at the start of pressurization (see Examples).

Example C] This example has a thickness of 0. Finished outer diameter:
It is set to 25.4waφ.

The center circle 10 shown in FIGS. 1 and 2 is 5-φ, and the second
Assuming that the trough curvature of the spiral ripples P shown in the figure is 1°5, and the peak curvature r' is 1.0 m+, the spiral ripples P are formed adjacent to each other from the third quadrant of the central circle 10. , the height t of the wave was 0.3 degrees, the height difference T between the outer periphery and the center was 1.5 degrees, and the curvature R was 100 degrees.The ripples P in the figure indicate the trajectory of each part (hereinafter, similar).

Further, as a comparative example, as shown in FIG. 7, a product having the same dimensions as the example was manufactured except that the center of curvature R was set on the inside.

FIG. 3 shows pressure-displacement curves obtained by setting this example and comparative example in the pressure-displacement measurement apparatus shown in FIGS. 5 and 6. In the figure, the solid line is the example, and the broken line is the comparative example.

From this result, in the example, at the start of pressurization (O ~ 700 questions ^
It can be seen that g) shows a nearly linear pressure-displacement.

In addition, as shown in FIG. 5, the pressure-displacement measuring device is constructed by bolting the measuring device A shown in FIG. It was assumed that the detection was carried out by As shown in FIG. 6, in the measuring device A, a leaf spring D of the example or comparative example is set in a casing 4 via a backing 5, compressed air is introduced from a boat 6, and the introduced pressure causes the leaf spring to Flex D and move displacement rod 2 to spring 7.
It pushes down against the

As shown in FIG. 4, as for the above-mentioned spiral ripple PIy) configuration, concentric circular ripples P1 are formed adjacent to the center circle 10, and concentrically with this concentric circular ripple P and at a predetermined interval outside. A circular ripple P8 is shaped, and a spiral ripple P is formed between the eye-shaped ripples P+ and Pg.
In the embodiment shown in FIG. 1, an outer circular ripple P2 may be formed (but no ripple P1 is formed), a spiral ripple P may be added to the ripple Pg, and so on. In each of these cases, a linear pressure-displacement curve was obtained at the start of pressurization.

〔Effect of the invention〕

Since the present invention is configured as described above, the pressure-displacement curve at the start of pressurization can be made linear, and it is effective for diaphragm type pressure sensors and the like in which such characteristics are desired.

[Brief explanation of drawings]

1 and 4 are schematic front views of embodiments of the disc spring according to the present invention, FIG. 2 is a sectional view of the embodiment of FIG. 1, FIG. 3 is a pressure-displacement measurement diagram, and FIG. The figure is a schematic diagram of a pressure car displacement measuring device, FIG. 6 is a sectional view of a main part of FIG. 5, and FIG. 7 is a sectional view of a conventional example. 10...Central circle, P, Pl...Spiral ripple, P, ,P,...Circular ripple, A...Pressure-displacement measuring device, D. ·····Disc spring.

Claims (4)

[Claims] (1) A wave-shaped cross section exhibiting a spiral ripple P from any point around the center circle 10 of the material plate, and the spiral ripple P is inclined toward the center circle 10 in a disc spring. A disc spring characterized in that the radial inclination of the ripples P is outwardly concave. (2) Incline height h and radial length l of the spiral ripple P
The disc spring according to claim 1, wherein the ratio h/l is 1/5 or less. (3) In the disc spring D according to claim (1), concentric circular ripples P_1 are adjacent to the center circle 10 of the material plate.
A disc spring characterized in that an outer circular ripple P_2 is formed concentrically with the concentric circular ripple P_1 and at a predetermined interval, and the spiral ripple P_3 is formed between both the circular ripples P_1 and P_2. . (4) A diaphragm characterized by using the disc spring D according to any one of claims (1) to (3).