CN110848300A - Butterfly spring structure - Google Patents

Abstract

The invention discloses a butterfly spring structure which comprises a spring body, wherein an inner flange is arranged on the edge of the inner side of the spring body, and the inner flange is of an annular structure extending around the axis of the spring body. More optimized adjustment links or ways can be provided for designing an ideal characteristic curve of the disc spring.

Description

Butterfly spring structure

Technical Field

The invention relates to the technical field of elastic parts, in particular to a butterfly spring structure.

Background

The invention relates to a belleville spring washer, which is a washer type spring made of metal plate or forged blank.

The disc spring is a special spring which is conical in the axial direction and bears load, and stores certain potential energy after bearing load deformation, for example, in the situation of bolt flange connection, when a bolt is loosened, the disc spring releases partial potential energy to keep the pressure between flange connections to meet the sealing requirement. The stress distribution of the disc spring is uniformly decreased from inside to outside, and the effect of low stroke and high compensation force can be realized.

In contrast to other types of springs, belleville springs play an important role in various fields by having the following features: the rigidity is high, the buffering and vibration absorbing capacity is high, the large load can be borne by small deformation, and the device is suitable for occasions with small requirements on axial space;

has variable rigidity characteristics: such springs have a wide range of non-linear characteristics;

the same disc spring adopts different combination modes, so that the spring characteristics can be changed in a large range: the combination mode of involution and superposition can be adopted, the combination mode of compounding different thicknesses, different sheet numbers and the like can also be adopted, and when the combination mode is superposed, the more the springs are, the larger the load is compared with the same deformation.

Further optimizing the structural design of the disc spring to make it have better mechanical properties is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

Aiming at the technical problems that the structural design of the disc spring is further optimized so as to have better mechanical property, which needs to be solved by the technical personnel in the field, the invention provides a disc spring structure. More optimized adjustment links or ways can be provided for designing an ideal characteristic curve of the disc spring.

Aiming at the problems, the butterfly spring structure provided by the invention solves the problems through the following technical points: the utility model provides a belleville spring structure, includes the spring body the inboard edge of spring body is provided with the inside turn-ups, the inside turn-ups is the loop configuration who encircles the extension of spring body axis.

This scheme proposes a new belleville spring structural style: compare with traditional form, the belleville spring that this scheme provided has set up a turn-ups in the inner circle department of spring: the inside flanging adopts the disc spring structural design that this scheme provided, compares in the disc spring of traditional form, under same material, inner circle size, outer full-scale and thickness condition, the disc spring that this scheme provided not only can promote the biggest work elasticity of spring, simultaneously, under the biggest elasticity atress condition, the last material stress of disc spring remains unchanged basically or reduces.

Meanwhile, the inner flanging is added to the structural design of the disc spring, and more optimized adjustment links or ways can be provided for designing an ideal disc spring characteristic curve by aiming at the parameter design of the disc spring or the characteristic curve design of the disc spring, such as adjusting the parameters of the inner flanging, the specific shape and size of the inner flanging, the connection condition on the spring and the like.

The further technical scheme is as follows:

as a specific inward flanging form which can greatly improve the maximum elasticity of the belleville spring under the condition that the material stress is basically unchanged, the inward flanging is of a flat annular structure.

As a specific inward flanging form which can greatly improve the maximum elasticity of the disc spring under the condition that the material stress is basically unchanged, the inward flanging is of an arc-shaped plate-shaped annular structure, the inner side and the outer side of the part of the inward flanging are equal-diameter arcs or formed by connecting multiple arcs in series on the cross section of the disc spring passing through the center of the disc spring, and the centers of circles corresponding to the equal-diameter arcs are located on the large end side of the disc spring.

As a specific inward flanging form which can greatly improve the maximum elasticity of the belleville spring under the condition that the material stress is basically unchanged, the inward flanging consists of a flat plate part and an arc-shaped plate part, wherein the flat plate part and the arc-shaped plate part are both annular, the flat plate part is positioned at the inner side of the arc-shaped plate part, and the outer side of the arc-shaped plate part is connected with the inner side of the spring body;

on the section of the disc spring passing through the center of the disc spring, the inner side and the outer side of the part where the arc plate part is located are both arcs, and the circle centers corresponding to the arcs are all located on the large end side of the disc spring.

Furthermore, in order to optimize the stress of the belleville spring during working, the setting is as follows: the inner surface and the outer surface of the disc spring are smooth surfaces.

The invention has the following beneficial effects:

this scheme proposes a new belleville spring structural style: compare with traditional form, the belleville spring that this scheme provided has set up a turn-ups in the inner circle department of spring: the inside flanging adopts the disc spring structural design that this scheme provided, compares in the disc spring of traditional form, under same material, inner circle size, outer full-scale and thickness condition, the disc spring that this scheme provided not only can promote the biggest work elasticity of spring, simultaneously, under the biggest elasticity atress condition, the last material stress of disc spring remains unchanged basically or reduces.

Meanwhile, the inner flanging is added to the structural design of the disc spring, and more optimized adjustment links or ways can be provided for designing an ideal disc spring characteristic curve by aiming at the parameter design of the disc spring or the characteristic curve design of the disc spring, such as adjusting the parameters of the inner flanging, the specific shape and size of the inner flanging, the connection condition on the spring and the like.

Drawings

FIG. 1 is a top plan view of a prior art belleville spring;

FIG. 2 is a cross-sectional view of a prior art belleville spring taken through the center of the cross-section;

FIG. 3 is a force-displacement characteristic diagram of one embodiment of a prior art belleville spring;

FIG. 4 is a cross-sectional stress cloud for the disc spring of FIG. 3 at maximum operating force;

FIG. 5 is a top view of an embodiment of a belleville spring configuration of the present invention;

FIG. 6 is a cross-sectional view of an embodiment of a disc spring structure according to the present invention, wherein a section line in the cross-sectional view passes through the center of the disc spring, the inner flange has a flat ring structure, and the rotation axis of the inner flange is collinear with the rotation axis of the disc spring;

FIG. 7 is a force-displacement characteristic diagram of one embodiment of a Belleville spring configuration according to the present invention;

FIG. 8 is a cross-sectional stress cloud of an embodiment of a belleville spring structure of the present invention;

FIG. 9 is a cross-sectional view of an embodiment of a belleville spring structure of the present invention, where the section line passes through the center of the belleville spring, and the inward flange is composed of a flat plate portion and an arc-shaped plate portion, and the rotation axis of the inward flange is collinear with the axis of the belleville spring.

The labels in the figure are respectively: 1. the inner flanging, 2, the spring body.

Detailed Description

The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples:

example 1:

as shown in fig. 5 to 9, a belleville spring structure includes a spring body 2, an inner flange 1 is disposed on an inner side edge of the spring body 2, and the inner flange 1 is an annular structure extending around an axis of the spring body 2.

This scheme proposes a new belleville spring structural style: compare with traditional form, the belleville spring that this scheme provided has set up a turn-ups in the inner circle department of spring: inner flanging 1, the belleville spring structural design that this scheme of adoption provided compares in the belleville spring of traditional form, under the same material, inner circle size, outer lane size and thickness condition, the belleville spring that this scheme provided not only can promote the maximum work elasticity of spring, simultaneously, under the biggest elasticity atress condition, the last material stress of belleville spring remains unchanged basically or reduces.

Meanwhile, the inner flanging 1 is added to the structural design of the disc spring, and aiming at the parameter design or the characteristic curve design of the disc spring, more optimized adjustment links or ways can be provided for designing an ideal disc spring characteristic curve by adjusting the parameters of the inner flanging 1, the specific shape and size of the inner flanging 1, the connection condition on the spring and the like.

More specifically, specific comparative examples are provided below to further illustrate:

table 1 contains a parameter comparison table of examples

As shown in fig. 1 to 9, fig. 1 and 2 are structures of a conventional disc spring, and under the conditions of the outer diameter m, the inner diameter N, the height h, and the thickness t set in table 1, force-displacement characteristic curves of parts are shown in fig. 3, when the disc spring is at the maximum force of 20.9N, the sectional stress cloud diagram of fig. 4 is obtained (fig. 4 is only a part of the sectional stress cloud diagram and is used for clearly reflecting core characteristics of the sectional stress cloud diagram), and as can be seen from the stress cloud diagram, the stress is relatively concentrated at the upper right corner in the diagram, and reaches 906 MPa. For certain materials, if the allowable stress of the material can reach 906MPa, the spring can be used, and if the allowable stress cannot be reached, or from the safety point of view, when a larger safety factor is needed, the design of the spring needs to be modified, and the spring is usually enlarged and thickened. I.e., the m, t dimensions in fig. 9; the cost can be increased to use materials with higher allowable stress. In some applications where the demands on volume, weight and cost are higher, a more optimized design is required to improve the performance of the part.

Fig. 5 and 6 are structural diagrams of belleville springs with improved bearing capacity and reduced stress in use according to the present invention. As shown in fig. 6, a cuff is added, which is defined by a length dimension a and an angle γ. Due to the existence of the flanging structure, materials participating in large strain of the part in a limited geometric dimension are increased, a high-stress area on the section tends to be a line under the condition of the maximum bearing capacity, namely the line of the flanging section close to the small end rather than the line of the flanging section close to the small end, and the rigidity of the part is improved. Referring to table 1, the same parameters m, N, t, and h are used to design the parts, and the force-displacement characteristic curve of the spring after flanging is added is shown in fig. 7, and as can be seen from fig. 7, the maximum bearing capacity of the parts reaches 26.3N, and compared with fig. 3, compared with the structural form defined by fig. 1 and 2, the force-displacement characteristic curve is similar, and the bearing capacity is improved by 25%. The stress cloud of the section of the part under the maximum bearing capacity condition of 26.3N is shown in figure 8. As can be seen from FIG. 8, the maximum stress inside the part is 655MPa, compared with the typical traditional disc spring in FIG. 1, the stress is reduced by 38%, and the large isostress line in the sectional stress cloud chart is almost parallel to the line of the flange section near the small end, so that more materials (the ring surface of the flange near the small end, but not the ring line formed by the sharp point of the traditional spring) participate in large strain, and the effects of reducing stress and improving bearing capacity and rigidity are achieved. Different optimization results can be obtained by adjusting a and gamma in fig. 6 or a and R in fig. 9.

Example 2:

the present embodiment is further limited based on embodiment 1, as shown in fig. 1 to 9, as a specific form of the inward flange 1 capable of greatly increasing the maximum elastic force of the belleville spring under the condition that the material stress is substantially unchanged, the inward flange 1 is in a flat annular structure.

As a specific form of the inward flanging 1 capable of greatly improving the maximum elasticity of the disc spring under the condition that the material stress is basically unchanged, the inward flanging 1 is of an arc-shaped plate-shaped annular structure, the inner side and the outer side of the part of the inward flanging 1 are equal-diameter arcs or are formed by connecting multiple arcs in series on the cross section of the disc spring passing through the center of the disc spring, and the circle centers corresponding to the equal-diameter arcs are located on the large end side of the disc spring.

As a specific inward flanging 1 form which can greatly improve the maximum elasticity of the belleville spring under the condition that the material stress is basically unchanged, the inward flanging 1 consists of a flat plate part and an arc-shaped plate part, the flat plate part and the arc-shaped plate part are both annular, the flat plate part is positioned at the inner side of the arc-shaped plate part, and the outer side of the arc-shaped plate part is connected with the inner side of the spring body 2;

on the section of the disc spring passing through the center of the disc spring, the inner side and the outer side of the part where the arc plate part is located are both arcs, and the circle centers corresponding to the arcs are all located on the large end side of the disc spring.

Furthermore, in order to optimize the stress of the belleville spring during working, the setting is as follows: the inner surface and the outer surface of the disc spring are smooth surfaces.

The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.

Claims (5)

1. The utility model provides a belleville spring structure, includes spring body (2), its characterized in that, the inboard edge of spring body (2) is provided with inside flange (1), inside flange (1) is for encircleing the annular structure of spring body (2) axis extension.

2. A belleville spring structure according to claim 1, characterized in that the inner flange (1) is of a flat plate-like annular configuration.

3. The disc spring structure according to claim 1, wherein the inward turned edge (1) is in an annular structure in the shape of an arc plate, and on a cross section of the disc spring passing through the center of the disc spring, the inner side and the outer side of the portion where the inward turned edge (1) is located are equal-diameter arcs or are formed by connecting multiple arcs in series, and the centers of circles corresponding to the equal-diameter arcs are located on the large end side of the disc spring.

4. A belleville spring structure according to claim 1, wherein the inward turned edge (1) is composed of a flat plate portion and an arc plate portion, both of which are annular, and the flat plate portion is located at the inner side of the arc plate portion, and the outer side of the arc plate portion is connected with the inner side of the spring body (2);

on the section of the disc spring passing through the center of the disc spring, the inner side and the outer side of the part where the arc plate part is located are both arcs, and the circle centers corresponding to the arcs are all located on the large end side of the disc spring.

5. A belleville spring structure according to any one of claims 1 to 4 wherein both the inner and outer surfaces of the belleville spring are smooth.

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