JPH0314930A - Coned disc spring - Google Patents

Abstract

PURPOSE:To obtain a disc spring capable of evenly and circumferentially deflecting and greatly deforming without deviation of stress and operating direction at the time of deflection by forming the cross section of the disc spring into a corrugated shape have spiral ripples from an optional point around a central circle of the material plate, and forming the spiral ripples so as to be inclined toward the central circle. CONSTITUTION:The cross section of a disc spring D is formed into a corrugated shape having spiral ripples P3 from an optional point around a central circle 10, and the spiral ripples P3 are formed to be inclined toward the central circle 10. When pressing force is applied to an optional point on the surface of the coned disk spring D, the disc spring D of this configuration transmits deflection due to the pressing force through the spiral ripples P3 to all the areas, and is deflected evenly and circumferentially without deviation of generated stress. Further, since the deflection is promoted by means of the inclination of the ripples P3, the coned disc spring is greatly deflected. Thus, when the coned disc spring D is applied to a diaphragm, the diaphragm can hold a constant restoring force for a long period of time due to this characteristics of the coned disc spring D.

Description

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

[Conventional technology and its problems]

Conventionally, as shown in Fig. IO, a disc spring for a diaphragm has a wavy cross-sectional shape that exhibits concentric ripples P around a center circle 10 of a material plate (see Fig. 2). . Note that the ripples P in the figure indicate the locus of the trough (
Same below).

However, in this case D, the rigidity is high because the peripheral fixing part is subjected to brazing, etc., and on the other hand, the central part also has a small radius of curvature, so the rigidity is high.

Therefore, if the deflection is small at the periphery and the center, and the deflection is concentrated in the middle, if the material plate is made of metal, buckling or cracking may occur due to metal fatigue. There are problems such as changes in resilience. In addition, each valley or each peak of the ripple P has the same level, that is, it has a flat shape that is not inclined toward the central circle, so the degree of deflection (displacement) is small, and the displacement curve with respect to the pressing force is steep. becomes.

Furthermore, in the deflection (deformation) action, the pressing force applied to the center circle 10 is not transmitted to the entire area of the disc spring, but is first transmitted to the innermost ripple P and is deflected between them, and when the deflection reaches a certain level, the ripple P The deformation is propagated step by step, exceeding P and reaching the next ripple P. Therefore, when the deflection exceeds the ripple P, a disturbance occurs in the displacement curve.
SUMMARY OF THE INVENTION An object of the present invention is to provide a disc spring and a diaphragm that are free from stress during deflection and bias in the operating direction, are deflected uniformly in the circumferential direction, and are capable of obtaining large displacements.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a disc spring with a wave-shaped cross section that exhibits spiral ripples from arbitrary points around the center circle of its material plate, and the spiral ripples are inclined toward the center circle. It was structured as follows. When a pressure force is applied to a disc spring constructed in this way, the deflection caused by the pressure force is transmitted to the entire area via spiral ripples, and the stress generated is uniform and the circumference is uniform. Deflects evenly in all directions. This deflection is facilitated by the slope of the ripples. In other words, there is a large displacement.

The degree of inclination of the spiral ripples, that is, the ratio (h#) of the inclination height h to the radial length l in FIG. 2 is preferably 1/5 or less. Preferably it is 1/6. This is because if it exceeds 1/5, the force applied during press molding will be significantly different between the outward slope and the inward slope, making it impossible to perform soaking.

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 wrinkled distortion that occurs on the outer periphery will be absorbed and dispersed on the outer periphery. It is absorbed and dispersed into circular ripples. This absorption and dispersion becomes more effective if the beginning and end of the spiral ripples merge into both circular ripples.

Therefore, if the above disc spring is used for the diaphragm,
Since the disc spring has the above characteristics, it has constant characteristics (restoring force) over a long period of time.

[Example 1] In this example, a disc spring is used as a diaphragm, and the materials used are stainless steel foil with a thickness of 0.015 ms, and a hoop with a diameter of 34 tm, which is pressed to have a finished outer diameter of 25 mm. The diameter is 4mm. The examples shown in FIGS. 1 and 2 were manufactured using this material foil, and in the same figures, each ripple P1, P! , the width d of P3 (between valleys, excluding the confluence part) is 1.8n, and the central circular ripple P
．． The diameter of the valley is 5.9 mm, and the inner diameter of each outer ripple P2 is 16 mm.
7 mmφ, and the trough curvature r of the spiral ripple P shown in FIG. 2 is 1.5 mm, and the peak curvature r' is 1.0 mm. A ripple P is formed, the height t of the wave is 0.3 degrees, the height difference T between the outer periphery and the center of the diaphragm D is 1.5 m, the curvature R of the diaphragm D is 100 mm, and the center of curvature is inside, That is, the slope was made to be an outward convex surface.

Incidentally, the spiral ripples P, start from equal parts of the central circular ripple Pl and end after just over one rotation, but it is preferable to make three or more revolutions, and also start from only one point and complete three revolutions. It is possible to do the above. The dimensions of each part are not limited to these, and are appropriately selected through experiments, etc., taking into consideration the location of the diaphragm D, the material, etc.

In addition to stainless steel foil, other known materials such as copper alloy foils such as phosphor bronze and beryllium copper, rubber, and plastics can be used as materials.

The diaphragm D is manufactured by press-shaping and punching using a die designed based on the above-mentioned specifications (shape). Molds are basically produced by electrical discharge machining and are used after adjustment. During this press forming, circular ripples P+, Pz are formed on the inner and outer sides, and both ends of the spiral ripple P, merge with both ripples PI, Pt, so that the distortion caused by the formation of the spiral ripple P3 causes the circular ripple P1 to form. , P2 was absorbed and wrinkles did not occur.

To manufacture the electrode S for electric discharge machining for manufacturing the mold, for example, the specifications of the diaphragm D are manually set on a milling machine capable of three-dimensional numerical control. It is manufactured by forming unevenness exhibiting ripples PPg and P* (not shown in Fig. 2).

As shown in FIG.
3, and the electrode S is installed in an electric discharge machine to produce a mold W.

The mold W requires a hollow mold and a female mold, but by forming two molds W obtained by the above electric discharge machining and performing the electric discharge machining using one of them as an electrode, the processed product and The remaining molds W provide both male and female molds. [Embodiment 2] As shown in FIGS. 5 and 6, this embodiment differs from the embodiment 1 in that the inner and outer concentric circular ripples P1 and P2 are not formed, and three equal-sized ripples are formed around the central circle 10. Spiral ripples P are formed adjacent to each other from the quantiles.

Based on this example, prototype examples 1 to 4 with the specifications (t, T, etc.) shown in Table 1 below were manufactured using the above manufacturing method shown in Example 1. Note that all stainless steel foil (hoop)
, its thickness: 0.015 mm, curvature R: 1
00 So1, finished outer diameter of diaphragm D: 25.4m-
is the same in each example. Further, the cross section of the ripple P of prototype example 1 is as shown in FIG. 7, and the other parts are as shown in FIG.

The number of turns of the ripple P is determined by the width of the ripple P (valley interval d), and it was 1 and a half turns for prototypes 1 and 2, and 2 turns for prototypes 3 and 4. Table 1 BA = bright softened material, ``/.H: quarter softened material.The diaphragm D thus manufactured was supported by the annular flange 2 as shown in Fig. 8, and the pressure displacement was measured using the diaphragm D. The results are shown in Figure 9. From Figure 9, it can be seen that prototypes 3 and 4 have points where the rise is large (200 to 500 tlHzO), and it is better to obtain digital output (ON-OFF) at that point. I understand. In any case, each example can be used sufficiently depending on the purpose.

In this example as well, the outer circular ripple P2 in Example 1 is formed, and the ripple P2 is provided with a spiral ripple P2.
It is also possible to have a configuration in which the two are merged.

〔Effect of the invention〕

Since the present invention is configured as described above, it can be deflected to a large extent and evenly around the circumference in response to the pressing force. Therefore, if it is applied to a diaphragm, a pressure detection device, etc., it can maintain constant characteristics over a long period of time. and high reliability can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of one embodiment of a disc spring according to the present invention, Fig. 2 is a sectional view of the same embodiment, Figs. 3 and 4 are illustrations for explaining the production of the same embodiment, and Fig. 5 is a schematic front view of another embodiment,
FIG. 6 is a sectional view of the same embodiment, FIG. 7 is a partial sectional view of another embodiment, and FIG.
Figure 9) is a sectional view of the same figure (al), Figure 9 is a pressure displacement measurement diagram, and Figure 10 is a schematic front view of a conventional disc spring. 10...Central circle, D... ... Belleville spring (diaphragm), P, P,...
...Spiral ripple, P1...Inner circular ripple,
Pt...Outer circular ripples.

Claims (4)

[Claims] (1) A disc spring having a wave-shaped cross section exhibiting spiral ripples P around a center circle 10 of the material plate from any point around it, and the spiral ripples P being inclined toward the center circle 10. (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) or (2), a concentric circular ripple P_1 is formed adjacently around the center circle 10 of the material plate, and the concentric circular ripple P_1
A disc spring characterized in that outer circular ripples P_2 are formed concentrically with and spaced apart from each other at a predetermined interval, and the spiral ripple P_3 is formed between both 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).