Rigidity-adjustable bushing for automobile

Abstract

The utility model relates to a rigidity adjustable bushing for an automobile, which comprises a metal inner pipe, a first rubber body, a second rubber body, a conductive coil, a magnetorheological elastomer, a metal outer pipe, a first cover plate and a second cover plate, the metal inner pipe comprises a first end part, a middle part and a second end part which are sequentially arranged along the axial direction of the metal inner pipe, the first rubber body is sleeved on the periphery of the first end part, and the second rubber body is sleeved on the periphery of the second end part. The periphery of the second end portion is sleeved with the second rubber body, the periphery of the middle portion is wound with the conductive coil, the periphery of the conductive coil is sleeved with the magneto-rheological elastomer, the periphery of the magneto-rheological elastomer is sleeved with the metal outer pipe, and the first cover plate is connected with one end of the metal outer pipe and at least shields one side end face of the metal outer pipe, one side end face of the magneto-rheological elastomer and one side end face of the conductive coil. The second cover plate is connected with the other end of the metal outer pipe and at least shields the metal outer pipe, the magnetorheological elastomer and the end face of the other side of the conductive coil. The rigidity of the automobile seat cushion is adjustable, and the automobile seat cushion can provide more excellent supporting performance and comfort for an automobile under different road conditions and can be prevented from being damaged during overload.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a bushing with adjustable stiffness utilizing a magnetorheological elastic body. Background Art

[0002] Shock-absorbing bushings are an important part of the automobile suspension system, playing an important role in buffering and shock absorption to improve driving comfort. In order to provide better support and comfort for the car under different road conditions, it is necessary to develop new bushings. Summary of the invention

[0003] The utility model aims to provide a rigidity adjustable bushing for automobiles which can provide excellent support and comfort.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A vehicle-use bushing with adjustable stiffness is connected to a suspension system of a vehicle. The bushing comprises a metal inner tube, a first rubber body, a second rubber body, a conductive coil, a magnetorheological elastomer, a metal outer tube, a first cover plate and a second cover plate. The metal inner tube comprises a first end portion, a middle portion and a second end portion arranged in sequence along its axial direction. The first rubber body is sleeved on the outer periphery of the first end portion, the second rubber body is sleeved on the outer periphery of the second end portion, the conductive coil is wound around the outer periphery of the middle portion, the magnetorheological elastomer is sleeved on the outer periphery of the conductive coil, and the metal outer tube is sleeved on the outer periphery of the magnetorheological elastomer. The first cover plate is connected to one end of the metal outer tube and at least shields one side end surface of the metal outer tube, the magnetorheological elastomer and the conductive coil. The second cover plate is connected to the other end of the metal outer tube and at least shields the other side end surface of the metal outer tube, the magnetorheological elastomer and the conductive coil.

[0006] The outer diameter of the middle portion is greater than the outer diameter of the first end portion, and the outer diameter of the middle portion is greater than the outer diameter of the second end portion.

[0007] The conductive coil completely covers the outer circumference of the middle portion.

[0008] The magnetorheological elastomer comprises a rubber matrix and magnetic metal particles filled and distributed in the rubber matrix.

[0009] The metal inner tube is provided with bolt holes along its axial direction for connecting the automobile stiffness adjustable bushing to a suspension system of an automobile.

[0010] The first end portion and the second end portion are symmetrically arranged, the first rubber body and the second rubber body are symmetrically arranged, and the first cover plate and the second cover plate are symmetrically arranged.

[0011] The first cover plate is interference fit with the metal outer tube, and the second cover plate is interference fit with the metal outer tube.

[0012] The first cover plate is provided with a first through hole, and the first end portion and the first rubber body are inserted into the first through hole; the second cover plate is provided with a second through hole, and the second end portion and the second rubber body are inserted into the second through hole.

[0013] The diameter of the first through hole is larger than the outer diameter of the first rubber body, and the diameter of the second through hole is larger than the outer diameter of the second rubber body.

[0014] The first through hole and the second through hole are both round holes.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art: the rigidity of the utility model is adjustable, which can provide better support and comfort for the car under different road conditions and prevent damage when overloaded. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 The utility model is an axonometric view of the appearance of the automobile stiffness adjustable bushing.

[0017] Attached Figure 2 It is a cross-sectional schematic diagram of the automobile stiffness adjustable bushing of the utility model.

[0018] Attached Figure 3 The utility model is an axonometric view of the automobile stiffness adjustable bushing without the first cover plate and the second cover plate.

[0019] In the above figures: 1. metal inner tube; 2. second rubber body; 3. second cover plate; 4. metal outer tube; 5. magnetorheological elastomer; 6. conductive coil; 7. first cover plate; 8. first rubber body. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the embodiments shown in the accompanying drawings.

[0021] Embodiment 1: A vehicle-use adjustable stiffness bushing connected to a suspension system of a vehicle comprises a metal inner tube 1, a first rubber body 8, a second rubber body 2, a conductive coil 6, a magnetorheological elastomer 5, a metal outer tube 4, a first cover plate 7 and a second cover plate 3.

[0022] The metal inner tube 1 can be divided into three parts, namely, a first end, a middle part and a second end arranged in sequence along its axial direction. In this embodiment, the outer diameter of the middle part of the metal inner tube 1 is larger than the outer diameter of the first end and the outer diameter of the second end, and the outer diameter of the first end can be equal to the outer diameter of the second end, so that the outer surface of the metal inner tube 1 forms a convex profile, wherein the outer peripheral surface of the first end and the outer peripheral surface of the middle part are transitionally connected through a first plane perpendicular to the axial direction of the metal inner tube 1, and the outer peripheral surface of the second end and the outer peripheral surface of the middle part are transitionally connected through a second plane perpendicular to the axial direction of the metal inner tube 1. The metal inner tube 1 is provided with bolt holes along its axial direction. Bolts can be easily installed through the bolt holes, so that the automotive stiffness adjustable bushing can be connected to the suspension system of the automobile, that is, the connection between the bushing and the suspension system is realized. The outer surface of the metal inner tube 1 is designed as a convex profile, which is more conducive to the formation of a loop of magnetic flux lines and the enhancement of magnetorheological effect. The first rubber body 8 is sleeved on the outer periphery of the first end, and the second rubber body 2 is sleeved on the outer periphery of the second end.

[0023] The first end and the second end of the metal inner tube 1 are symmetrically arranged, the first rubber body 8 and the second rubber body 2 are symmetrically arranged, and both the first rubber body 8 and the second rubber body 2 are made of high-hardness rubber. The first rubber body 8 and the second rubber body 2 are distributed at both ends of the metal inner tube 1, which can prevent the metal inner tube 1 from directly colliding with the first cover plate 7 and the second cover plate 3 when the bushing works radially, and play a buffering role; at the same time, the first rubber body 8 and the second rubber body 2 use high-hardness rubber to withstand greater load impact.

[0024] The conductive coil 6 is wound around the outer periphery of the middle part of the metal inner tube 1, and the conductive coil 6 completely covers the outer periphery of the middle part of the metal inner tube 1. In this way, the number of turns of the conductive coil 6 can be maximized to increase the magnetic field strength, thereby enhancing the magnetorheological effect, and achieving a wider range of adjustment of the bushing stiffness; at the same time, the two ends of the wire coil 6 are not covered by the first rubber body 8 and the second rubber body 2, so the heat dissipation condition is better, and it can withstand a larger current intensity, thereby enhancing the magnetorheological effect, and achieving a wider range of adjustment of the bushing stiffness.

[0025] The magnetorheological elastomer 5 is sleeved on the outer periphery of the conductive coil 6, and the metal outer tube 4 is sleeved on the outer periphery of the magnetorheological elastomer 5, that is, the magnetorheological elastomer 5 is located between the conductive coil 6 and the metal outer tube 4, so that the magnetic induction lines generated by the conductive coil 6 can smoothly pass through the magnetorheological elastomer 5 to produce a magnetorheological effect. The magnetorheological elastomer 5 includes a base material and a filling material, the base material is rubber, and the filling material is magnetic metal particles, that is, the magnetorheological elastomer 5 includes a rubber base and magnetic metal particles distributed in the rubber base. The magnetorheological elastomer 5 can be formed by mixing magnetic metal particles into the rubber base, and the stiffness of the magnetorheological elastomer 5 can be changed by controlling the magnetic field strength, thereby realizing active adjustment of the bushing stiffness.

[0026] The end faces of one side of the shielded metal outer tube 4, magnetorheological elastomer 5, and conductive coil 6 are flush with the first plane of the metal inner tube 1, and the end faces of the other side of the shielded metal outer tube 4, magnetorheological elastomer 5, and conductive coil 6 are flush with the second plane of the metal inner tube 1. The first cover plate 7 is connected to one end of the metal outer tube 4 and shields at least one end face of the metal outer tube 4, magnetorheological elastomer 5, and conductive coil 6, that is, the end faces of one side that are flush with the first plane of the metal inner tube 1. The second cover plate 3 is connected to the other end of the metal outer tube 4 and shields at least the other end face of the metal outer tube 4, magnetorheological elastomer 5, and conductive coil 6, that is, the end faces of one side that are flush with the second plane of the metal inner tube 1. The first cover plate 7 and the second cover plate 3 are symmetrically arranged. The first cover plate 7 is interference fit with the metal outer tube 4, and the second cover plate 3 is interference fit with the metal outer tube 4. The first cover plate 7 and the second cover plate 3 are axially symmetrically distributed, which can realize the axial limiting function of the bushing and prevent the bushing from failing due to excessive axial load, that is, the first cover plate 7 and the second cover plate 3 can prevent the bushing from being damaged when overloaded; at the same time, the first cover plate 7 and the second cover plate 3 can protect the conductive coil 6 and the magnetorheological elastomer 5, and prevent foreign matter from entering the bushing to damage the conductive coil 6 and the magnetorheological elastomer 5. A first through hole is provided on the first cover plate 7, and the first end and the first rubber body 8 are penetrated in the first through hole. A second through hole is provided on the second cover plate 3, and the second end and the second rubber body 2 are penetrated in the second through hole. The first through hole and the second through hole are both circular holes, and the aperture of the first through hole is larger than the outer diameter of the first rubber body 8, and the aperture of the second through hole is larger than the outer diameter of the second rubber body 2, which can ensure that the bushing moves smoothly in the radial direction and realizes radial work; at the same time, the radial displacement of the bushing can be limited to prevent the bushing from failing due to excessive radial load.

[0027] In the above scheme, the first rubber body 8, the second rubber body 2 and the metal inner tube 1 are vulcanized; the metal inner tube 1, the conductive coil 6, the first rubber body 8, the second rubber body 2, the magnetorheological elastomer 5 and the metal outer tube 4 are vulcanized together.

[0028] The bushing can adjust the input current to control the bushing stiffness, thereby providing better support and comfort for the car under different road conditions.

[0029] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A stiffness adjustable bushing for an automobile, connected to a suspension system of the automobile, characterized in that: The automotive stiffness adjustable bushing comprises a metal inner tube (1), a first rubber body (8), a second rubber body (2), a conductive coil (6), a magnetorheological elastomer (5), a metal outer tube (4), a first cover plate (7) and a second cover plate (3), wherein the metal inner tube (1) comprises a first end portion, a middle portion and a second end portion arranged in sequence along its axial direction, the first rubber body (8) is sleeved on the outer periphery of the first end portion, the second rubber body (2) is sleeved on the outer periphery of the second end portion, the conductive coil (6) is wound around the outer periphery of the middle portion, and the magnetorheological elastomer (5) is sleeved on the outer periphery of the middle portion. The magnetorheological elastic body (5) is sleeved on the outer circumference of the conductive coil (6), the metal outer tube (4) is sleeved on the outer circumference of the magnetorheological elastic body (5), the first cover plate (7) is connected to one end of the metal outer tube (4) and at least shields one side end surface of the metal outer tube (4), the magnetorheological elastic body (5) and the conductive coil (6), and the second cover plate (3) is connected to the other end of the metal outer tube (4) and at least shields the other side end surfaces of the metal outer tube (4), the magnetorheological elastic body (5) and the conductive coil (6).

2. The automotive stiffness adjustable bushing according to claim 1, characterized in that: The outer diameter of the middle portion is greater than the outer diameter of the first end portion, and the outer diameter of the middle portion is greater than the outer diameter of the second end portion.

3. The automotive stiffness adjustable bushing according to claim 2, characterized in that: The conductive coil (6) completely covers the outer circumference of the middle portion.

4. The automotive stiffness adjustable bushing according to claim 1, characterized in that: The metal inner tube (1) is provided with bolt holes along its axial direction for connecting the vehicle stiffness adjustable bushing to the suspension system of the vehicle.

5. The automotive stiffness adjustable bushing according to claim 1, characterized in that: The first end portion and the second end portion are symmetrically arranged, the first rubber body (8) and the second rubber body (2) are symmetrically arranged, and the first cover plate (7) and the second cover plate (3) are symmetrically arranged.

6. The vehicle-use bushing with adjustable stiffness according to claim 1, characterized in that: The first cover plate (7) is interference fit with the metal outer tube (4), and the second cover plate (3) is interference fit with the metal outer tube (4).

7. The vehicle-use bushing with adjustable stiffness according to claim 1, characterized in that: The first cover plate (7) is provided with a first through hole, and the first end portion and the first rubber body (8) are inserted into the first through hole; the second cover plate (3) is provided with a second through hole, and the second end portion and the second rubber body (2) are inserted into the second through hole.

8. The vehicle-use bushing with adjustable stiffness according to claim 7, characterized in that: The diameter of the first through hole is larger than the outer diameter of the first rubber body (8), and the diameter of the second through hole is larger than the outer diameter of the second rubber body (2).

9. The automotive stiffness adjustable bushing according to claim 8, characterized in that: The first through hole and the second through hole are both round holes.

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