Auxiliary frame bushing with progressive rigidity change and auxiliary noise reduction structure

Abstract

The utility model discloses an auxiliary frame bushing with a progressive rigidity change and auxiliary noise reduction structure, the auxiliary frame bushing comprises an inner core, an outer tube and a flexible buffer component, the inner core is tubular, the outer tube comprises a tubular main body part and a flanging part arranged at one end part of the main body part, and the flexible buffer component is arranged on the outer tube. The flanging part is arranged in the circumferential direction of the end of the main body part, the buffering assembly comprises a first buffering part wrapping the upper surface of the flanging part and a second buffering part arranged on the upper surface of the first buffering part, and the hardness of the second buffering part is smaller than that of the first buffering part; and the second buffer part is provided with a grid structure.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a subframe bushing with progressive stiffness variation and auxiliary noise reduction structure. Background Technology

[0002] As a key connecting component between the suspension and the vehicle body, the subframe bushing must reduce inertia from forward and reverse movements to improve handling stability, and also reduce excessive bumps caused by driving over potholes and uneven road surfaces to enhance cushioning. Common subframe bushing shells feature a vulcanized layer of cushioning rubber of a certain thickness on the flanged structure to increase cushioning and improve comfort. However, under normal circumstances, metal parts directly collide axially with the bushing. While the rubber provides cushioning, in harsh conditions, it can cause abnormal noises and insufficient vibration energy absorption, requiring adjustments to the rubber stiffness or structure. This adjustment method is too simplistic and has a limited range of adjustment. In summary, the traditional design of the subframe bushing's cushioning rubber is prone to wear, exacerbates fatigue damage, and has a relatively short service life, affecting its usability. Utility Model Content

[0003] The purpose of this invention is to overcome the deficiencies in the prior art and provide a subframe bushing with progressive stiffness variation and auxiliary noise reduction structure.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A subframe bushing with progressive stiffness variation and auxiliary noise reduction structure is disclosed. The subframe bushing includes an inner core, an outer tube, and a flexible buffer assembly. The inner core is tubular, and the outer tube includes a tubular main body and a flanged portion disposed at one end of the main body. The flanged portion is circumferentially disposed along the end of the main body. The flexible buffer assembly includes a first buffer portion covering the upper surface of the flanged portion and a second buffer portion disposed on the upper surface of the first buffer portion. The hardness of the second buffer portion is less than that of the first buffer portion, and the second buffer portion has a mesh structure.

[0006] In one embodiment, the second buffer portion has a plurality of portions, which are spaced apart circumferentially along the upper surface of the flange portion.

[0007] In one embodiment, each of the second buffer portions includes a base and the mesh structure disposed above the base, the base being fan-shaped.

[0008] In one embodiment, the mesh structure includes a plurality of radially arranged radial strips and a plurality of circumferentially arranged axially, the radial strips and the circumferential strips being staggered to form the mesh structure, the ends of the radial strips facing the inner core being not closed, and / or the ends of the radial strips away from the inner core being not closed.

[0009] In one embodiment, the radial strip is provided at both ends of the circumferential strip.

[0010] In one embodiment, the mesh structure is not exposed above the substrate in the horizontal direction, and the two ends of the substrate in the circumferential direction have extension space for the mesh structure to deform and extend.

[0011] In one embodiment, the first buffer portion includes an annular bottom and protrusions circumferentially spaced above the annular bottom. The protrusions are fan-shaped, and the base is disposed above the protrusions, with each base corresponding to one of the protrusions.

[0012] In one embodiment, the base is disposed above the protrusion without being exposed in the horizontal direction.

[0013] In one embodiment, the flexible buffer assembly further includes a third buffer portion disposed between the main body and the inner core, wherein the first buffer portion and the third buffer portion are integrally formed.

[0014] In one embodiment, the first and third buffer portions are made of high-hardness rubber, and the second buffer portion is made of low-hardness rubber.

[0015] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0016] 1. The subframe bushing of this utility model forms a composite structure with different stiffness distribution by setting a first buffer part and a second buffer part with different hardness on the flange. The second buffer part, which is in direct contact with the metal parts, uses a low-hardness material for small load buffering, while the first buffer part, which is set below the second buffer part, uses a high-hardness material for large load support. The material gradient achieves a smooth transition between "soft" and "hard", enhances axial buffering, increases the nonlinear deformation process, avoids impact noise caused by sudden stiffness changes in traditional structures, and also avoids premature fatigue failure and abnormal noise caused by excessive wear in a single area.

[0017] 2. The subframe bushing of this utility model has a mesh structure in the second buffer section that is in direct contact with the metal parts. The mesh structure provides a large deformation space for buffering deformation, prevents excessive local stress, and improves fatigue durability. Attached Figure Description

[0018] Figure 1 This is a partial exploded view of the subframe bushing in one embodiment of the present invention;

[0019] Figure 2 This is a three-dimensional schematic diagram of the subframe bushing in one embodiment of the present utility model;

[0020] Figure 3 This is a top view of the subframe bushing in one embodiment of the present utility model;

[0021] Figure 4 This is a longitudinal sectional view of the subframe bushing in one embodiment of the present invention;

[0022] The numbers on the map are:

[0023] 1-Inner core; 2-Outer tube; 21-Main body; 22-Flanged edge; 3-First buffer part; 31-Annular bottom; 32-Protrusion; 4-Second buffer part; 41-Base; 411-Extension space; 42-Grid structure; 421-Radial strip; 422-Circumferential strip; 5-Third buffer part. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] In the description of this utility model, the directions such as "front," "rear," "left," "right," "up," and "down" are explained as follows: Figure 4 As shown in the figure, the left side is "left", the right side is "right", the top side is "up", the bottom side is "down", and the direction perpendicular to the viewpoint is "forward" and "backward". The above definitions of directions are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figure 1-4 As shown, in some embodiments of this utility model, the subframe bushing includes an inner core 1, an outer tube 2, and a flexible buffer assembly.

[0027] The inner core 1 is tubular with a through hole in the middle.

[0028] The outer tube 2 includes a tubular main body 21 and a flanged portion 22 disposed at one end of the main body 21. A through hole is provided in the middle of the main body 21, and the flanged portion 22 is circumferentially disposed along the end of the main body 21. The outer tube 2 is sleeved over the inner core 1, and the outer tube 2 and the inner core 1 are coaxially arranged. The outer tube 2 and the inner core 1 can be made of high-strength aluminum alloy, which meets strength requirements and is corrosion-resistant.

[0029] The flexible cushioning assembly includes a first cushioning part 3 covering the upper surface of the flange 22, a second cushioning part 4 disposed on the upper surface of the first cushioning part 3, and a third cushioning part 5 disposed between the inner core 1 and the main body 21.

[0030] The first buffer portion 3 includes an annular bottom 31 and protrusions 32 circumferentially spaced above the annular bottom 31. The protrusions 32 are fan-shaped. Figure 1-3 As shown, in some embodiments, there are four protrusions 32, which are equally spaced apart and integrally formed with the annular bottom 31. By leaving gaps between the multiple protrusions 32, deformation space can be provided for the deformation of the entire protrusion 32, local stress can be distributed, and the fatigue durability of the subframe bushing can be improved.

[0031] The second buffer section 4 has multiple portions, and the multiple second buffer sections 4 are arranged circumferentially along the upper surface of the flange section 22. For example Figure 1-3 As shown, in some embodiments, the second buffer portion 4 has four parts, which are arranged one-to-one with the protrusion 32 and located above the protrusion 32.

[0032] Specifically, the second buffer section 4 includes a base 41 and a mesh structure 42. The mesh structure 42 is disposed above the base 41, which is fan-shaped. The mesh structure 42 includes multiple radially arranged radial strips 421 and multiple axially arranged circumferential strips 422. The radial strips 421 and circumferential strips 422 are staggered to form the mesh structure 42. In some embodiments, the ends of the radial strips 421 facing the inner core 1 are not closed, and the ends of the radial strips 421 away from the inner core 1 are not closed, so that the mesh structure 42 can have sufficient spatial deformation when subjected to axial force, thereby dispersing stress and improving the buffer durability of the subframe bushing. Figure 1-3 As shown, the mesh structure 42 in each second buffer section 4 includes seven radial strips 421 and two circumferential strips 422. In other embodiments, the number of radial strips 421 and circumferential strips 422 can be adjusted according to the specific dimensions and buffering performance of the subframe cover. The spacing between the radial strips 421 and the spacing between the circumferential strips 422 can also be adjusted. By setting the mesh structure 42, an air damping effect can be formed around it, achieving an auxiliary noise reduction effect.

[0033] In some embodiments, in the horizontal direction, the mesh structure 42 is not exposed above the base 41, and the two ends of the base 41 in the circumferential direction have extension spaces for the mesh structure 42 to deform and extend, such as... Figure 1-3As shown, radial strips 421 are provided at both ends of the circumferential strip 422. That is, in each second buffer part 4, the radial strips 421 at both ends of the circumferential strip 421 form a step with the base 41 to achieve gradient stress dispersion. In some embodiments, the base 41 is not exposed above the protrusion 32 in the horizontal direction, thus forming a three-layer gradient stress dispersion of radial strips 421, base 41, and protrusion 32. The hardness of the second buffer part 4 is set to be less than that of the first buffer part 3, thereby forming a buffer support from top to bottom, from soft to hard, to achieve a gradual change in stiffness.

[0034] In some embodiments, the first buffer part 3 and the third buffer part 5 are integrally formed, the first buffer part 3 and the third buffer part 5 are made of high-hardness rubber, and the second buffer part is made of low-hardness rubber.

[0035] In use, the subframe bushing of this invention employs a highly elastic material for small load buffering in the second buffer section 4, while the first buffer section 3 uses a high-hardness material for large load support. This material gradient achieves a smooth transition between "soft" and "hard" materials, avoiding impact noise caused by abrupt changes in stiffness in traditional structures. Furthermore, the mesh structure 42 of the second buffer section 4 generates nonlinear stiffness during deformation, and utilizes the air compression effect to enhance high-frequency noise absorption. Particularly in the axial direction, it adds a damping effect to the originally nonlinearly deformable flexible buffer component, enhancing its buffering properties, absorbing more vibration energy, suppressing high-frequency vibration transmission, and reducing abnormal noise. Especially under high-frequency vibration, it also prevents relative sliding between the metal surface and the second buffer section 4, reducing frictional slippage and abnormal noise, and lowering the wear rate.

[0036] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A subframe bushing with progressive stiffness variation and auxiliary noise reduction structure, characterized in that, The subframe bushing includes an inner core, an outer tube, and a flexible cushioning assembly. The inner core is tubular, and the outer tube includes a tubular main body and a flanged portion disposed at one end of the main body. The flanged portion is circumferentially disposed along the end of the main body. The flexible cushioning assembly includes a first cushioning portion covering the upper surface of the flanged portion and a second cushioning portion disposed on the upper surface of the first cushioning portion. The hardness of the second cushioning portion is less than that of the first cushioning portion, and the second cushioning portion has a mesh structure.

2. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 1, characterized in that: The second buffer portion has multiple portions, which are spaced apart circumferentially along the upper surface of the flange portion.

3. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 2, characterized in that: Each of the second buffer portions includes a base and the mesh structure disposed above the base, the base being fan-shaped.

4. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 3, characterized in that: The mesh structure includes a plurality of radially arranged radial strips and a plurality of circumferentially arranged axially. The radial strips and the circumferential strips are arranged alternately to form the mesh structure. The ends of the radial strips facing the inner core are not closed, and / or the ends of the radial strips away from the inner core are not closed.

5. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 4, characterized in that: The radial strip is provided at both ends of the circumferential strip.

6. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 3, characterized in that: In the horizontal direction, the mesh structure is not exposed above the substrate, and the two ends of the substrate in the circumferential direction have extension space for the mesh structure to deform and extend.

7. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 6, characterized in that: The first buffer portion includes an annular bottom and protrusions circumferentially spaced above the annular bottom. The protrusions are fan-shaped, and the base is disposed above the protrusions, with the base and the protrusions corresponding to each other.

8. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 7, characterized in that: In the horizontal direction, the base is disposed above the protrusion without being exposed.

9. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 1, characterized in that: The flexible buffer assembly further includes a third buffer portion disposed between the main body and the inner core, wherein the first buffer portion and the third buffer portion are integrally formed.

10. The subframe bushing with progressive stiffness variation and auxiliary noise reduction structure according to claim 9, characterized in that: The first and third buffer parts are made of high-hardness rubber, while the second buffer part is made of low-hardness rubber.

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