An anti-impact rubber friction composite structure vibration isolator

Abstract

This application belongs to the application field of vibration isolation and buffering technology for aerospace and airborne equipment, and particularly relates to an anti-impact rubber friction composite structure vibration isolator. For the anti-impact rubber friction composite structure vibration isolator of this application, during random small-displacement vibration, the overall deformation of the rubber block provides stiffness, and the dry friction between the friction plate and the housing and the damping of the rubber material play a role in damping and vibration elimination. During large-displacement impact, when the deformation of the rubber block reaches the position of the upper and lower shims, as the force further increases, the rubber vulcanizate enters the position of the reed. The reed adopts an arc-shaped structure, and as the displacement increases, the stiffness presents the characteristics of a hard spring, thereby playing a role in gradually reducing the impact, avoiding rubber damage caused by secondary impact or equipment damage caused by secondary impact. After the impact ends, the rubber vulcanizate returns to the middle position under the reaction force of the reed, thereby achieving the functions of self-adaptive vibration reduction and impact isolation.

Description

Technical Field

[0001] This application belongs to the application field of vibration isolation and buffering technology for aviation and aerospace airborne equipment, and particularly relates to an anti-impact rubber friction composite structure vibration isolator. Background Art

[0002] Currently, with the development of military equipment, there are more and more requirements for high speed, high precision, and multi-purpose on land and at sea, resulting in increasingly complex vibration conditions of the equipment. For example, amphibious aircraft face strong impact loads when entering the water, fighter jets face catapult and arrestment impacts during takeoff and landing on aircraft carriers, and rocket launches also face ignition impacts. These require the vibration isolation system to have broadband vibration isolation and shock isolation.

[0003] Rubber vibration isolators mainly rely on the overall deformation of rubber materials to provide stiffness and the cross-linked structure between rubber molecules to provide damping to achieve the effect of vibration isolation and damping elimination. Their three-directional stiffness is easy to design and is widely used in the vibration reduction installation of various precision equipment. However, the damping of rubber materials themselves is relatively low, and it amplifies greatly at resonance, which is easy to cause resonance damage to the equipment. At the same time, low-frequency rubber vibration isolators are prone to tearing under impact conditions, and at the same time, it is easy to cause secondary impact damage due to insufficient buffer space.

[0004] Therefore, it is desired to have a technical solution to overcome or at least mitigate at least one of the above defects of the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide an anti-impact rubber friction composite structure vibration isolator to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is as follows:

[0007] An anti-impact rubber friction composite structure vibration isolator, comprising:

[0008] A housing, which is cylindrical. An installation cavity is provided in the middle of the housing, and reed installation holes are opened on both the upper side wall surface and the lower side wall surface of the installation cavity of the housing;

[0009] Reeds, both ends of which are installed in the reed installation holes;

[0010] A rubber vulcanizate, which includes a friction plate, a rubber block, and a mounting core. Among them,

[0011] The friction plate is nested in the installation cavity, and the outer wall surface of the friction plate is adapted to the inner wall surface of the installation cavity of the housing;

[0012] The rubber block is arranged inside the friction plate, and a mounting core assembly hole is opened in the center of the rubber block;

[0013] Threaded holes are provided on both the upper end face and the lower end face of the mounting core. The lower end of the mounting core is disposed in the mounting core assembly hole. A boss is provided on the mounting core, and an external thread is provided on the mounting core above the boss.

[0014] A lower retaining piece, which is installed on the lower end face of the mounting core by screws;

[0015] An upper retaining piece, which is installed on the upper side of the boss of the mounting core by a nut.

[0016] In at least one embodiment of the present application, the reed includes a reed main body portion, and a first connecting portion and a second connecting portion located at both ends of the reed main body portion. Among them,

[0017] The reed main body portion is arc-shaped or bent;

[0018] The first connecting portion is riveted in the reed mounting hole on the side close to the mounting cavity;

[0019] The second connecting portion is riveted in the reed mounting hole on the side far from the mounting cavity. The second connecting portion is parallel to the first connecting portion and has a length greater than that of the first connecting portion. A stop block is provided on the second connecting portion.

[0020] In at least one embodiment of the present application, eight groups of reeds are evenly arranged circumferentially on the wall surface of the housing. Each group includes two springs symmetrically installed on the upper side wall surface and the lower side wall surface of the housing mounting cavity.

[0021] In at least one embodiment of the present application, the friction plate, the rubber block, and the mounting core are vulcanized into an integral structure in a mold.

[0022] In at least one embodiment of the present application, the friction plate is a structure of 12 arc segments formed by dividing a whole ring.

[0023] In at least one embodiment of the present application, the outer wall surface of the friction plate and the inner wall surface of the mounting cavity of the housing are both arc-shaped.

[0024] In at least one embodiment of the present application, the outer wall surface of the friction plate and the inner wall surface of the mounting cavity of the housing are both spherical.

[0025] In at least one embodiment of the present application, a flange mounting edge for connecting to the foundation positioning platform is provided at the lower end of the housing, and the threaded hole on the upper end face of the mounting core is used to connect to the vibration isolation equipment.

[0026] In at least one embodiment of the present application, both the lower retaining piece and the upper retaining piece are U-shaped, and the openings both face the friction plate.

[0027] The invention has at least the following beneficial technical effects:

[0028] The anti-impact rubber friction composite structure vibration isolator of the present application increases the damping of the vibration isolation system by applying friction damping, and adapts to impact and random vibration conditions through structural design, and is suitable for large impacts and high overloads. Description of the Drawings

[0029] Figure 1 is an overall schematic diagram of the anti-impact rubber friction composite structure vibration isolator of an embodiment of the present application;

[0030] Figure 2 is a cross-sectional view of the anti-impact rubber friction composite structure vibration isolator of an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of the housing of an embodiment of the present application;

[0032] Figure 4 is a schematic diagram of the reed of an embodiment of the present application;

[0033] Figure 5 is a schematic diagram of the rubber vulcanizate of an embodiment of the present application;

[0034] Figure 6 is a schematic diagram of the friction plate of an embodiment of the present application;

[0035] Figure 7 is an assembly schematic diagram of the retaining plate of an embodiment of the present application.

[0036] Wherein:

[0037] 1 - housing; 2 - reed; 201 - main body part of the reed; 202 - first connecting part; 203 - second connecting part; 204 - stop block; 3 - lower retaining plate; 4 - rubber vulcanizate; 401 - friction plate; 402 - rubber block; 403 - mounting core; 5 - upper retaining plate. Detailed Embodiments

[0038] To make the objectives, technical solutions, and advantages of the present application more clear, the following will describe the technical solutions in the embodiments of the present application in more detail with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application. The following will explain the embodiments of the present application in detail with reference to the accompanying drawings.

[0039] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the scope of protection of the present application.

[0040] The following will further describe the present application in detail with reference to the attached Figures 1 to 7 drawings.

[0041] The present application provides an impact-resistant rubber friction composite structure vibration isolator, including: a housing 1, a reed 2, a rubber vulcanizate 4, a lower retaining plate 3, and an upper retaining plate 5.

[0042] Specifically, as Figures 1-2 shown, the housing 1 is cylindrical, with a flange mounting edge left at its lower end. Four mounting holes are provided on the flange mounting edge for mating connection with the foundation positioning platform to achieve the positioning and installation of the overall impact-resistant rubber friction composite structure vibration isolator. An installation cavity for assembling the rubber vulcanizate 4 is provided in the middle of the housing 1. Paired reed mounting holes for assembling the reed 2 are provided on both the upper and lower side walls of the installation cavity of the housing 1; the reed 2 includes a plurality of reeds, and both ends thereof are installed in the reed mounting holes.

[0043] The rubber vulcanizate 4 is a rubber vulcanization structure, which includes a friction plate 401, a rubber block 402, and a mounting core 403. Among them, the friction plate 401 is nested in the mounting cavity, and the outer wall surface of the friction plate 401 is adapted to the inner wall surface of the mounting cavity of the housing 1; the rubber block 402 is arranged inside the friction plate 401, and a mounting core assembly hole is provided in the center of the rubber block 402; a threaded hole for assembling the equipment to be vibration-isolated is provided on the upper end surface of the mounting core 403, and a threaded hole for assembling the lower retaining plate 3 is provided on the lower end surface of the mounting core 403. The lower end of the mounting core 403 is arranged in the mounting core assembly hole. A boss is provided on the mounting core 403, and an external thread for assembling the upper retaining plate 5 is provided on the mounting core 403 above the boss; the lower retaining plate 3 is fixedly installed on the lower end surface of the mounting core 403 by screws, and the upper retaining plate 5 is sleeved on the mounting core 403 and fixedly installed on the upper side of the boss of the mounting core 403 by nuts.

[0044] In a preferred embodiment of the present application, as Figure 4 shown, the reed 2 includes a reed main body portion 201, and a first connecting portion 202 and a second connecting portion 203 located at both ends of the reed main body portion 201. Among them, the reed main body portion 201 is in an arc shape or an inclined curved shape; the first connecting portion 202 is riveted in the reed mounting hole on the side close to the mounting cavity; the second connecting portion 203 is riveted in the reed mounting hole on the side far from the mounting cavity. The second connecting portion 203 is parallel to the first connecting portion 202 and has a length greater than that of the first connecting portion 202. A stop block 204 is provided on the second connecting portion 203. In this embodiment, eight groups of reeds 2 are evenly arranged along the circumferential direction on the wall surface of the housing 1, and each group includes two springs 2 symmetrically installed on the upper side wall surface and the lower side wall surface of the mounting cavity of the housing 1.

[0045] In a preferred embodiment of the present application, the friction plate 401, the rubber block 402, and the mounting core 403 of the rubber vulcanizate 4 are vulcanized into an integral structure in a mold. During operation, the friction plate 401 needs to be in close contact with the inner wall surface of the housing 1 and needs to be supported by elastic force. Therefore, the friction plate 401 is a split structure. In this embodiment, preferably, the friction plate 401 is a structure composed of 12 arc segments formed by dividing a whole ring. The outer wall surface of the friction plate 401 and the inner wall surface of the mounting cavity of the housing 1 are both arc-shaped, or the outer wall surface of the friction plate 401 and the inner wall surface of the mounting cavity of the housing 1 are both spherical. The damping can be increased or decreased by adjusting the diameter of the friction plate 401.

[0046] In a preferred embodiment of the present application, both the lower retaining plate 3 and the upper retaining plate 5 are in a U shape, and the openings are both facing the friction plate 401.

[0047] For the anti-impact rubber friction composite structure vibration isolator of the present application, according to the load conditions and equipment situation, requirements such as the stiffness, damping, and displacement required by the vibration reduction system are calculated. The structure of the rubber vulcanizate 4 and the structure of the leaf spring 2 are designed by methods such as finite element simulation, the connection dimensions of the vibration isolator are determined, and the structural dimensions are designed and the strength is checked. The manufacturing and assembly process of the vibration isolator in the present application is as follows:

[0048] 1. Complete the rubber vulcanizate 4 by vulcanization in the mold;

[0049] 2. Install the upper retaining piece 5 on the installation core 403 with a nut, and install the lower retaining piece 3 at the bottom of the installation core 403 with a screw. The assembly form of the lower retaining piece 3 and the upper retaining piece 5 is as Figure 7 shown;

[0050] 3. Forcefully press the rubber vulcanizate 4 into the installation cavity of the housing 1;

[0051] 4. Install the leaf spring 2 into the leaf spring installation holes of the housing 1 in sequence.

[0052] For the anti-impact rubber friction composite structure vibration isolator of the present application, during random small-displacement vibration, the overall deformation of the rubber block 402 provides stiffness, and the dry friction between the friction plate 401 and the housing 1 and the rubber material damping play a role in damping and vibration reduction. During large-displacement impact, when the deformation of the rubber block 402 reaches the position of the upper and lower retaining pieces, as the force further increases, the rubber vulcanizate 4 enters the position of the leaf spring 2. The leaf spring 2 adopts an arc-shaped structure, and as the displacement increases, the stiffness presents the characteristics of a hard spring, thereby playing a role in gradually reducing the impact, avoiding rubber damage caused by secondary impact or equipment damage caused by secondary impact. After the impact ends, the rubber vulcanizate 4 returns to the middle position under the reaction force of the leaf spring 2, thereby achieving the functions of self-adaptive vibration reduction and impact isolation. The upper and lower retaining pieces are respectively fixedly connected to the installation core 403 through installation nuts and screws. During large-displacement loading, the upper and lower retaining pieces respectively play a role in preventing further deformation of the rubber block 402, thereby protecting the rubber block 402 from tearing damage.

[0053] For the anti-impact rubber friction composite structure vibration isolator of the present application, the rubber plays the roles of stiffness and partial damping, and the friction pair composed of the friction plate and the housing plays a greater damping role; during random vibration with small displacements, the rubber vulcanizate and the friction pair play the roles of vibration isolation and damping and vibration reduction; under the action of large-displacement impact loads, the rubber vulcanizate enters the inside of the conical leaf spring combination, and its stiffness has the characteristics of a gradually changing hard spring, playing a role in isolating large-displacement impacts; after the impact ends, the elastic force of the leaf spring 2 enables the rubber vulcanizate 4 to return to the middle equilibrium position. The stiffness of the vibration isolator of the present application can be freely designed, and it is easy to obtain a three-way equal-stiffness vibration isolator, which has the advantage of self-adaptation to working conditions; it has strong damping, and when the vibration reduction system resonates, it suppresses the excessive amplification of vibration. At the same time, the diameter of the friction plate can be adjusted to increase or decrease the damping.

[0054] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An anti-shock rubber friction composite structure vibration isolator, characterized in that, Comprising: A housing (1), which is cylindrical. An installation cavity is provided in the middle of the housing (1), and reed mounting holes are provided on both the upper side wall surface and the lower side wall surface of the installation cavity of the housing (1); Reeds (2), with both ends of the reeds (2) mounted in the reed mounting holes; A rubber vulcanizate (4), which includes a friction plate (401), rubber blocks (402), and a mounting core (403). Among them, The friction plate (401) is nested in the installation cavity, and the outer wall surface of the friction plate (401) is adapted to the inner wall surface of the installation cavity of the housing (1); The rubber blocks (402) are arranged inside the friction plate (401), and a mounting core assembly hole is provided in the center of the rubber blocks (402); Threaded holes are provided on both the upper end surface and the lower end surface of the mounting core (403). The lower end of the mounting core (403) is arranged in the mounting core assembly hole. A boss is provided on the mounting core (403), and an external thread is provided on the mounting core (403) above the boss; A lower retaining plate (3), which is mounted on the lower end surface of the mounting core (403) by screws; An upper retaining plate (5), which is mounted on the upper side of the boss of the mounting core (403) by nuts.

2. The anti-shock rubber friction composite structure vibration isolator according to claim 1, wherein The reed (2) includes a reed main body portion (201), and a first connecting portion (202) and a second connecting portion (203) located at both ends of the reed main body portion (201). Among them, The reed main body portion (201) is arc-shaped or bent; The first connecting portion (202) is riveted in the reed mounting hole on the side close to the installation cavity; The second connecting portion (203) is riveted in the reed mounting hole on the side far from the installation cavity. The second connecting portion (203) is parallel to the first connecting portion (202) and has a length greater than that of the first connecting portion (202). A stop block (204) is provided on the second connecting portion (203).

3. The anti-impact rubber friction composite structure vibration isolator according to claim 2, characterized in that, Eight groups of the reeds (2) are evenly arranged along the circumferential direction on the wall surface of the housing (1). Each group includes two reeds (2) symmetrically mounted on the upper side wall surface and the lower side wall surface of the installation cavity of the housing (1).

4. The shock-resistant rubber friction composite structure vibration isolator according to claim 1, characterized in that, The friction plate (401), the rubber blocks (402), and the mounting core (403) are vulcanized into an integral structure in a mold.

5. The anti-impact rubber friction composite structure vibration isolator according to claim 4, characterized in that The friction plate (401) is composed of 12 arc segments formed by dividing a whole ring.

6. The shock-resistant rubber friction composite structure vibration isolator according to claim 4, characterized in that, Both the outer wall surface of the friction plate (401) and the inner wall surface of the installation cavity of the housing (1) are arc-shaped.

7. The shock-resistant rubber friction composite structure vibration isolator according to claim 4, characterized in that, Both the outer wall surface of the friction plate (401) and the inner wall surface of the installation cavity of the housing (1) are spherical.

8. The anti-shock rubber friction composite structure vibration isolator according to claim 4, characterized in that, A flange mounting edge for connecting with a foundation positioning platform is provided at the lower end of the housing (1), and the threaded hole on the upper end surface of the mounting core (403) is used for connecting with the equipment to be vibration isolated.

9. The shock-resistant rubber friction composite structure vibration isolator according to claim 1, characterized in that, Both the lower retaining plate (3) and the upper retaining plate (5) are U-shaped, and their openings are all facing the friction plate (401).

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