CN117108664A - Load self-adaptive elastic vibration isolator - Google Patents

Abstract

The invention discloses a load self-adaptive elastic vibration isolator, which comprises a first carrier, a second carrier and an elastomer, wherein the first carrier is a hollow structure; the first carrier is provided with a cylindrical first accommodating groove, and the side wall of the first accommodating groove extends along the direction close to the elastic body to form a first cambered surface; the elastic body comprises a first end face, a second end face and a side face, and the side face comprises a first conical surface; when the load mass is smaller than or equal to a preset critical load value, the first conical surface and the first cambered surface are arranged at intervals; when the load mass is larger than a preset critical load value, the first conical surface is pressed and deformed so as to be attached and connected with the first cambered surface. According to the invention, as the elastic body is deformed under pressure, the first cambered surface is contacted with the first conical surface, so that the effective supporting area between the first carrier and the elastic body is increased, and the natural frequency of the elastic vibration isolator is basically kept constant, so that the relatively stable vibration isolation performance is ensured in a relatively large load range, and the vibration isolator has load self-adaption capability and strong adaptability.

Description

Load self-adaptive elastic vibration isolator

[ field of technology ]

The invention relates to the technical field of vibration isolators, in particular to a load self-adaptive elastic vibration isolator.

[ background Art ]

The vibration isolator is a resilient member connecting the device and the base to reduce and eliminate vibration forces transmitted by the device to the base and vibrations transmitted by the base to the device. Common passive vibration isolators, such as metal spring isolators, rubber air bag isolators, and the like, typically have a constant stiffness of the elastomeric element over an allowable load range. That is, when the load varies within a certain range, the natural frequency of the vibration isolator also varies, and thus the vibration isolator is represented as a large difference in vibration isolation effect when the vibration isolator is applied to different load values, that is, the load adaptability of the vibration isolator is poor.

In view of the above, it is desirable to provide a load-adaptive elastomeric vibration isolator that overcomes the above-described drawbacks.

[ invention ]

The invention aims to provide a load self-adaptive elastic vibration isolator, which aims to solve the problem of poor load adaptability of the existing vibration isolator and can ensure stable vibration isolation performance in a certain load range.

In order to achieve the above object, the present invention provides a load-adaptive elastic vibration isolator, which includes a first carrier, a second carrier and an elastic body; opposite sides of the elastic body are respectively abutted against one side, close to each other, of the first carrier and the second carrier; a cylindrical first accommodating groove is formed in one side, close to the second carrier, of the first carrier, and the side wall of the first accommodating groove extends along the direction close to the elastic body to form a first cambered surface; the elastic body comprises a first end face, a second end face and a side face, wherein the side face comprises a first conical surface connected with the first end face; the second end face is abutted with the second carrier; the first end face is abutted with the bottom of the first accommodating groove; when the load mass of the elastic body is smaller than or equal to a preset critical load value, the first conical surface and the first cambered surface are arranged at intervals; when the load mass of the elastic body is larger than a preset critical load value, the first conical surface is pressed and deformed so as to be attached and connected with the first cambered surface.

In a preferred embodiment, the elastomer is internally provided with a relief groove, and the opening of the relief groove faces the second carrier.

In a preferred embodiment, the relief groove is in the form of a truncated cone, and the axis thereof is located on the same line as the central axis of the elastic body.

In a preferred embodiment, a cylindrical second accommodating groove is formed in one side, close to the first carrier, of the second carrier, and the side wall of the second accommodating groove extends along the direction close to the elastic body to form a second cambered surface; the side surface also comprises a second conical surface connected with the second end surface; the second end face is abutted with the bottom of the second accommodating groove; when the load mass of the elastic body is smaller than or equal to a preset critical load value, the second conical surface and the second cambered surface are arranged at intervals; when the load mass of the elastic body is larger than a preset critical load value, the second conical surface is pressed and deformed so as to be attached and connected with the second cambered surface.

In a preferred embodiment, the angle between the second conical surface and the first conical surface is an obtuse angle.

In a preferred embodiment, the second conical surface and the first conical surface are symmetrically arranged on the basis of a joint.

In a preferred embodiment, an avoidance hole is formed in the elastomer, and two ends of the avoidance hole penetrate through the first end face and the second end face respectively.

In a preferred embodiment, the relief hole is cylindrical and has an axis that is aligned with the central axis of the elastomer.

The self-adaptive load elastic vibration isolator provided by the invention has the advantages that the surface in the first accommodating groove of the first carrier is provided with the first cambered surface which is specially designed and is matched with the outline of the first conical surface of the elastic body, and when the load mass on the vibration isolator is smaller than the critical load value Mc, the first cambered surface is not contacted with the first conical surface. According to the spring constant formula of the elastic body, the natural frequency of the elastic vibration isolator gradually decreases along with the increase of the load mass; when the load mass is greater than the critical load Mc, the elastic body is pressed and deformed, and the first cambered surface is contacted with the first conical surface, so that the effective supporting area between the first carrier and the elastic body is increased, and when the effective supporting area and the load mass are in linear synchronous change, the natural frequency of the elastic vibration isolator is basically kept constant, so that the stable vibration isolation performance can be ensured in a larger load range. In addition, the first accommodating groove can also play a transverse limiting role on the first end face of the elastic body, and buckling instability of the elastic body when the elastic body is subjected to larger pressure can be prevented.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Figure 1 is a longitudinal cross-sectional view of the load-adaptive elastomeric isolator of the present invention with components connected;

figure 2 is a longitudinal cross-sectional view of the load-adaptive elastomeric vibration isolator of figure 1;

figure 3 is a longitudinal cross-sectional view of another embodiment of the load-adaptive elastomeric vibration isolator illustrated in figure 1;

FIG. 4 is a longitudinal cross-sectional view of the load-adaptive elastomeric vibration isolator of FIG. 2 under compression;

fig. 5 is a graph of load versus natural frequency for a load-adaptive elastomeric isolator provided by the present invention;

figure 6 is a longitudinal cross-sectional view of yet another embodiment of a load-adaptive elastomeric vibration isolator provided by the present invention.

Reference numerals in the drawings: 100. load-adaptive elastic vibration isolator; 10. a first carrier; 11. a first receiving groove; 12. a first cambered surface; 20. a second carrier; 21. a second accommodating groove; 22. a second cambered surface; 30. an elastomer; 31. a first end face; 32. a second end face; 33. a side surface; 331. a first conical surface; 332. a second conical surface; 34. an avoidance groove; 35. avoiding the hole.

[ detailed description ] of the invention

In order to make the objects, technical solutions and advantageous technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the invention, and not to limit the invention.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

In an embodiment of the present invention, a load-adaptive elastomeric vibration isolator 100 is provided for isolating load devices and has a relatively constant natural frequency over a relatively large load range.

As shown in fig. 1, the load-adaptive elastic vibration isolator 100 includes a first carrier 10, a second carrier 20, and an elastic body 30. Opposite sides of the elastic body 30 are respectively abutted against one side of the first carrier 10 and one side of the second carrier 20, which are close to each other.

It should be noted that, the first carrier 10 and the second carrier 20 may be disposed up and down (as shown in fig. 2) to realize a vertical load, where the first carrier 10 is an upper cover and the second carrier 20 is a base; the first carrier 10 and the second carrier 20 may also be inverted with respect to the arrangement of fig. 2 (as shown in fig. 3); meanwhile, the first carrier 10 and the second carrier 20 may also be laterally mounted to achieve lateral loading. Therefore, the fixing modes are all within the protection scope of the invention.

Specifically, a cylindrical first receiving groove 11 is formed in one side of the first carrier 10 adjacent to the second carrier 20. The side wall of the first accommodating groove 11 extends along the direction approaching the elastic body 30 to form a first cambered surface 12.

The elastic body 30 includes a first end face 31, a second end face 32, and side faces 33. As shown in fig. 1 to 4, in the present embodiment, the elastic body 30 has a conical shape, i.e., a trapezoid shape in longitudinal section. The first end face 31 is disposed in parallel with the second end face 32 at a spacing.

The side surface 33 includes a first conical surface 331 connected to the first end surface 31. Further, an escape groove 34 is formed in the elastic body 30, and an opening of the escape groove 34 faces the second carrier 20. When the elastic body 30 is pressed, the deformation pressed inward can be absorbed by the escape groove 34, so as to realize the deformation function and the rebound function of the elastic body 30.

Further, the relief groove 34 is in the shape of a truncated cone, and the central axis of the relief groove is in the same line as the central axis of the elastic body 30. That is, the avoiding groove 34 is provided at the center of the elastic body 30 to ensure the balance of the forces at each lateral position during the supporting process, and to prevent the elastic body 30 from buckling to one side.

In the present embodiment, the second end surface 32 abuts against the second carrier 20, and the first end surface 31 abuts against the bottom of the first accommodation groove 11. The first accommodating groove 11 can play a lateral limiting role on the first end face 31 of the elastic body 30, and buckling instability of the elastic body 30 under a large pressure can be prevented.

As shown in fig. 2, when the load mass of the elastic body 30 is smaller than the preset critical load value Mc, the first conical surface 331 is spaced from the first cambered surface 12. As shown in fig. 4, when the load mass of the elastic body 30 is greater than the preset critical load value Mc, the first conical surface 331 is compressively deformed to be attached to the first cambered surface 12.

It should be noted that, the natural frequency calculation formula of the elastic vibration isolator is:f is natural frequency, A is effective support area, E is elastic modulus, T is elastomer thickness, M is load mass. Referring to fig. 5, when the load mass on the elastic vibration isolator is less than the critical load value Mc, the first step isA conical surface 331 is not in contact with the first arcuate surface 12. According to the calculation formula of the elastic body, the natural frequency of the elastic vibration isolator gradually decreases with the increase of the load mass; when the load mass is greater than the critical load Mc, the first conical surface 331 will contact the first cambered surface 12 (as shown in fig. 4) due to the compressive deformation of the elastic body 30, thereby increasing the effective support area of the elastic vibration isolator. Therefore, the effective support area becomes large when the load mass increases due to the load self-adaptation capability. From the above formula, f will remain constant while A/M remains constant or varies in line-sync.

Therefore, the load self-adaptive elastic vibration isolator 100 provided by the invention adopts a finite element method to carry out load loading simulation to obtain the contact state of the first conical surface 331 and the first cambered surface 12 in a certain load range, and carries out iterative calculation to obtain a proper curve equation of the first cambered surface 12, so that the load and natural frequency curve of the elastic vibration isolator has the characteristics shown in fig. 5, namely, after critical load mass Mc, the natural frequency is basically kept constant, and thus, the stable vibration isolation performance can be ensured in a certain load range. Compared with a metal spring vibration isolator, a rubber vibration isolator and the like, the vibration isolator has load self-adaption capability and strong adaptability. In addition, compared with the common sandwich structure elastic vibration isolator, the upper limit of the load capacity of the elastic vibration isolator is improved.

In another embodiment, as shown in fig. 6, the first carrier 10 and the second carrier 20 may have symmetrical structures, so that a designed special profile curve is provided at both ends of the elastic body 30 to obtain a constant natural frequency characteristic.

Specifically, a cylindrical second accommodating groove 21 is formed on one side of the second carrier 20 near the first carrier 10, and a side wall of the second accommodating groove 21 extends along a direction near the elastic body 30 to form a second cambered surface 22. The side surface 33 further includes a second conical surface 332 that is connected to the second end surface 32. The second end surface 32 abuts against the bottom of the second accommodation groove 21. When the load mass of the elastic body 30 is less than or equal to a preset critical load value, the second conical surface 332 and the second cambered surface 22 are arranged at intervals; when the load mass of the elastic body 30 is greater than a preset critical load value, the second conical surface 332 is compressively deformed to be attached to the second cambered surface 22.

It should be noted that, the principle of the natural frequency between the second cambered surface 22 and the second conical surface 332 relative to the load change may refer to the first cambered surface 12 and the first conical surface 331 described above, and will not be described herein again.

The included angle between the second conical surface 332 and the first conical surface 331 is an obtuse angle, so as to ensure the strength of elastic deformation. Further, the second conical surface 332 and the first conical surface 331 are symmetrically arranged based on the connection, so that the elastic body 30 can generate the same deformation to the first carrier 10 and the second carrier 20.

Further, the elastic body 30 is provided with a relief hole 35 inside. Both ends of the escape hole 35 penetrate the first end surface 31 and the second end surface 32, respectively. Wherein, dodging hole 35 is cylindric, and wherein the axis is located on same straight line with the axis of elastomer 30. When the elastic body 30 is pressed, deformation pressed inward can be absorbed by the escape hole 35, so as to realize the deformation function and rebound function of the elastic body 30.

In summary, in the load-adaptive elastic vibration isolator 100 provided by the invention, the surface in the first accommodating groove 11 of the first carrier 10 is provided with the first cambered surface 12 with a special design, which is matched with the contour of the first conical surface 331 of the elastic body 30, and when the load mass on the vibration isolator is smaller than the critical load value Mc, the first cambered surface 12 is not contacted with the first conical surface 331. As can be seen from the calculation formula of the natural frequency of the elastic body 30, the natural frequency of the elastic vibration isolator gradually decreases as the load mass increases; when the load mass is greater than the critical load Mc, the elastic body 30 is pressed and deformed, so that the first cambered surface 12 is contacted with the first conical surface 331, the effective supporting area between the first carrier 10 and the elastic body 30 is increased, when the effective supporting area and the load mass are in linear synchronous change, the natural frequency of the elastic vibration isolator is basically kept constant, and therefore stable vibration isolation performance can be ensured in a larger load range. In addition, the first accommodating groove 11 also has a lateral limiting function on the first end face 31 of the elastic body 30, so that buckling instability of the elastic body 30 under a large pressure can be prevented.

The present invention is not limited to the details and embodiments described herein, and thus additional advantages and modifications may readily be made by those skilled in the art, without departing from the spirit and scope of the general concepts defined in the claims and the equivalents thereof, and the invention is not limited to the specific details, representative apparatus and illustrative examples shown and described herein.

Claims (8)

1. The self-adaptive load elastic vibration isolator is characterized by comprising a first carrier, a second carrier and an elastomer; opposite sides of the elastic body are respectively abutted against one side, close to each other, of the first carrier and the second carrier; a cylindrical first accommodating groove is formed in one side, close to the second carrier, of the first carrier, and the side wall of the first accommodating groove extends along the direction close to the elastic body to form a first cambered surface; the elastic body comprises a first end face, a second end face and a side face, wherein the side face comprises a first conical surface connected with the first end face; the second end face is abutted with the second carrier; the first end face is abutted with the bottom of the first accommodating groove; when the load mass of the elastic body is smaller than or equal to a preset critical load value, the first conical surface and the first cambered surface are arranged at intervals; when the load mass of the elastic body is larger than a preset critical load value, the first conical surface is pressed and deformed so as to be attached and connected with the first cambered surface.

2. The load-adaptive elastic vibration isolator according to claim 1, wherein the elastic body is internally provided with a relief groove, and an opening of the relief groove faces the second carrier.

3. The load-adaptive elastic vibration isolator according to claim 2, wherein the relief groove is in the shape of a truncated cone, and wherein the axis is on the same line as the central axis of the elastic body.

4. The load-adaptive elastic vibration isolator according to claim 1, wherein a cylindrical second accommodating groove is formed in one side of the second carrier, which is close to the first carrier, and the side wall of the second accommodating groove extends along the direction, which is close to the elastic body, to form a second cambered surface; the side surface also comprises a second conical surface connected with the second end surface; the second end face is abutted with the bottom of the second accommodating groove; when the load mass of the elastic body is smaller than or equal to a preset critical load value, the second conical surface and the second cambered surface are arranged at intervals; when the load mass of the elastic body is larger than a preset critical load value, the second conical surface is pressed and deformed so as to be attached and connected with the second cambered surface.

5. The load-adaptive elastic vibration isolator according to claim 4, wherein the angle between the second conical surface and the first conical surface is an obtuse angle.

6. The load-adaptive elastic vibration isolator according to claim 4, wherein the second conical surface and the first conical surface are symmetrically arranged based on a joint.

7. The load-adaptive elastic vibration isolator according to claim 4, wherein the elastic body is internally provided with an avoidance hole, and two ends of the avoidance hole respectively penetrate through the first end face and the second end face.

8. The load-adaptive elastic vibration isolator according to claim 7, wherein the relief hole is cylindrical and wherein the axis is in the same line as the central axis of the elastic body.