Bushing for air damper

Abstract

The utility model relates to a bushing for an air shock absorber, which comprises an inner core, a middle buffer body and an outer pipe, the inner core comprises a body and an annular convex part, the upper end face of the annular convex part and the upper end face of the body are spaced, the lower end face of the annular convex part and the lower end face of the body are spaced, and a central hole is formed in the middle of the body; the middle buffer body is positioned between the inner core and the outer pipe; the middle buffer body comprises a main body, a plurality of upper convex bodies are arranged at the upper end of the main body, a plurality of lower convex bodies are arranged at the lower end of the main body, the upper convex bodies located at the upper end of the main body are annularly arranged, and at least one upper convex body protrudes out of the upper end of the main body; the lower convex bodies located at the lower end of the body are annularly arranged, and at least one lower convex body protrudes out of the lower end of the body. According to the lining for the air shock absorber, the axial rigidity performance of the lining is changed by adjusting the height of the annular protrusion; and the upper convex body and the lower convex body are arranged, so that the axial rigidity performance and wear resistance requirements of the bushing are effectively balanced, and abnormal sound is avoided.

Description

Technical Field

[0001] This utility model relates to a bushing for an air damper. Background Technology

[0002] Previously, suspension systems commonly used coil springs and shock absorbers with linearly varying stiffness. However, as people's living standards have improved, they have paid more and more attention to the handling and stability of vehicles. This structure can no longer meet the requirements for vehicle handling stability under complex operating conditions.

[0003] Currently, most electric passenger vehicles use a structure that combines air springs and shock absorbers in series to reduce space occupation. Air suspension has adjustable and non-linear stiffness, which can effectively reduce amplitude and improve handling stability; in addition, air suspension can adjust the chassis ground clearance, improving vehicle passability.

[0004] The problem with the top bushings used in the previous suspension system was:

[0005] 1. Currently, most electric passenger vehicles use a structure that combines air springs and shock absorbers in series to reduce space occupation. The top mount bushing, for sealing purposes, is interference-fitted with the other components, making it difficult to remove. This necessitates high wear resistance and durability for the top mount bushing, while existing top mount bushings have poor wear resistance and low durability requirements.

[0006] 2. In order to ensure the air suspension sealing requirements, the top bushing needs to have a sealing structure assembly space;

[0007] 3. Electric passenger vehicles do not have engines, and the vehicles are sensitive to abnormal noises. The top rubber bushing of the air damper cannot avoid the occurrence of abnormal noises under normal operating conditions.

[0008] The top rubber bushings used in previous suspension systems could not meet the sealing requirements of air suspension, which necessitates the development of a top rubber bushing for air shock absorbers. Utility Model Content

[0009] The purpose of this invention is to provide a bushing for an air damper.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] A bushing for an air damper includes an inner core, an intermediate buffer body, and an outer tube. The inner core has a circular cross-section and includes a body and an annular protrusion. The annular protrusion surrounds the body circumferentially and is disposed outside the body. A distance is maintained between the upper end face of the annular protrusion and the upper end face of the body, and a distance is maintained between the lower end face of the annular protrusion and the lower end face of the body. A central hole is provided in the middle of the body. The intermediate buffer body is located between the inner core and the outer tube.

[0012] The intermediate buffer body includes a main body, with multiple upper protrusions at the upper end and multiple lower protrusions at the lower end. The upper protrusions at the upper end of the main body are arranged in a ring, with at least one upper protrusion protruding from the upper end of the main body; the lower protrusions at the lower end of the main body are arranged in a ring, with at least one lower protrusion protruding from the lower end of the main body.

[0013] According to some embodiments of this utility model, the inner wall of the central hole of the main body is provided with a receiving groove that is recessed towards the outer periphery of the inner core, and the receiving groove is used to receive the sealing ring.

[0014] According to some embodiments of the present invention, the plurality of upper protrusions include a plurality of first upper protrusions and a plurality of second upper protrusions, wherein the first upper protrusions and the second upper protrusions are arranged adjacent to each other, and the height of the first upper protrusions is less than the height of the second upper protrusions.

[0015] The plurality of lower protrusions include a plurality of first lower protrusions and a plurality of second lower protrusions, wherein the first lower protrusions and the second lower protrusions are arranged adjacent to each other, and the height of the first lower protrusions is less than the height of the second lower protrusions.

[0016] According to some embodiments of the present invention, the outer periphery of the annular protrusion is provided with a groove that is recessed toward the center of the body, and the groove is arranged around the outer periphery of the annular protrusion.

[0017] According to some embodiments of this utility model, the diameter of the groove gradually increases from near the center of the body to away from the center of the body.

[0018] According to some embodiments of the present invention, the outer peripheral wall of the outer tube is provided with a first groove that is recessed toward its center, and the first groove is arranged around the outer periphery of the outer tube.

[0019] According to some embodiments of this utility model, the outer peripheral wall of the outer tube is provided with a second groove that is recessed toward its center. The second groove is arranged around the outer periphery of the outer tube and is used to accommodate a sealing ring.

[0020] According to some embodiments of this utility model, the outer tube includes a first section, a second section, and a third section connected sequentially along its axial direction. The diameter of the first section is consistent, the diameter of the second section gradually decreases from the first section to the third section, and the diameter of the third section is consistent. The first section has a first groove on its outer periphery, and the third section has a second groove on its outer periphery.

[0021] According to some embodiments of this utility model, the first segment has an upwardly inclined surface at one end near the other end of the outer tube, and the diameter of the upwardly inclined surface gradually increases from the first segment to the third segment; the third segment has a downwardly inclined surface at one end near the outer tube, and the diameter of the downwardly inclined surface gradually decreases from the first segment to the third segment.

[0022] According to some embodiments of this utility model, the upper end face of the annular protrusion is provided with a downwardly recessed upper groove, and the lower end face of the annular protrusion is provided with an upwardly recessed lower groove.

[0023] According to some embodiments of this utility model, the upper end of the intermediate buffer body is provided with a downwardly recessed upper adjustment groove, and the lower end of the intermediate buffer body is provided with an upwardly recessed lower adjustment groove. The upper adjustment groove is closer to the outer tube than the upper groove, and the lower adjustment groove is closer to the outer tube than the lower groove.

[0024] According to some embodiments of this utility model, the outer tube is made of aluminum; the inner core is made of steel.

[0025] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0026] The air damper bushing provided by this utility model changes the axial stiffness performance of the bushing by adjusting the height of the annular convex part; the upper and lower convex parts effectively balance the axial stiffness and wear resistance requirements of the bushing, thus avoiding abnormal noise; the upper and lower convex parts of the intermediate buffer body make interference contact with the corresponding external mating parts, thus avoiding subjectively unacceptable abnormal noise caused by the bushing in the passenger cabin during vehicle testing. Attached Figure Description

[0027] Appendix Figure 1 Structural diagram of the bushing for the air damper provided by this utility model;

[0028] Appendix Figure 2 A cross-sectional view of the bushing for the air damper provided by this utility model;

[0029] Appendix Figure 3 A structural diagram showing the connection between the bushing for the air damper and the reducer rod provided by this utility model;

[0030] Appendix Figure 4 For the appendix Figure 3 Enlarged view of the middle bushing;

[0031] Appendix Figure 5 A structural diagram of the inner core of the bushing for the air damper provided by this utility model;

[0032] Appendix Figure 6The structural diagram of the outer tube of the bushing for the air damper provided by this utility model.

[0033] In the attached diagrams above:

[0034] 1-Inner core, 11-Body, 121-Upper end face of the annular protrusion, 122-Lower end face of the annular protrusion, 123-Groove, 124-Upper groove, 125-Lower groove;

[0035] 2-Outer tube, 21-First section, 211-First slot, 212-Upper inclined surface, 22-Second section, 23-Third section, 231-Second slot, 232-Lower inclined surface;

[0036] 3-Intermediate buffer body, 31-Main body, 311-Upper adjustment groove, 312-Lower adjustment groove, 32-Upper protrusion, 33-Lower protrusion; 4-Shock absorber rod; 5-Sealing ring; 6-Outer mating part; 7-Pressure ring; 8-Nut; 9-Spacer. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] See Figures 1 to 6The air damper bushing includes an inner core 1, an intermediate buffer body 3, and an outer tube 2, wherein:

[0041] The inner core 1 is used for assembling the shock absorber rod 4 and the sealing ring 5 (sealing O-ring). The inner core 1 is cylindrical and has a circular cross-section. The inner core 1 includes a body 11 and an annular protrusion. The body 11 is cylindrical and the annular protrusion surrounds the body 11 circumferentially and is located outside the body 11 (the annular protrusion protrudes outward along the radial direction of the outer circumference of the body 11). The axial stiffness performance of the bushing can be changed by adjusting the height of the annular protrusion.

[0042] A central hole is provided in the middle of the body 11, which passes through the upper and lower ends of the body 11. The central hole is used for the shock absorber rod to pass through. A receiving groove is provided on the inner wall of the central hole, which is recessed towards the outer periphery of the inner core 1. The height of the receiving groove is less than the height of the central hole. The receiving groove is used to accommodate the sealing ring 5. The receiving groove facilitates the installation of the sealing ring 5 (O-ring) and effectively avoids the risk of reducing the strength of the shock absorber rod by digging a groove on the shock absorber rod.

[0043] In some implementations, see Figure 4 The body 11 contains two sealing rings 5 ​​along its height direction in the receiving groove. The two sealing rings 5 ​​are separated by a spacer 9, which is a plastic ring.

[0044] The annular protrusion has a circular cross-section. A distance is maintained between the upper end face 121 of the annular protrusion and the upper end face of the body 11, meaning the upper end of the annular protrusion does not exceed the upper end of the body 11. Similarly, a distance is maintained between the lower end face 122 of the annular protrusion and the lower end face of the body 11, meaning the lower end of the annular protrusion does not exceed the lower end of the body 11. The height of the annular protrusion (… Figure 4 The height h between a and b is less than the height of the body 11. The upper end face 121 of the annular protrusion can be parallel to the upper end face of the body 11, and the lower end face 122 of the annular protrusion can be parallel to the lower end face of the body 11.

[0045] In this example, the outer periphery of the annular protrusion is provided with a groove 123 that is recessed towards the center of the body 11. The groove 123 is arranged around the outer periphery of the annular protrusion, that is, the groove 123 is annular. The radial stiffness performance of the bushing can be improved by adjusting the depth of the groove 123.

[0046] In some embodiments, the groove 123 is open outwards, and the diameter of the groove 123 gradually increases from near the center of the body 11 to away from the center of the body 11. See [reference needed] Figure 5 That is, the diameter of the bottom wall of the groove 123 is smaller than the diameter of the opening of the groove 123.

[0047] The outer tube 2 is used for assembling the outer mating part 6 and the sealing ring 5 (O-ring). The outer tube 2 is cylindrical. The upper end of the outer tube 2 is interference-fitted with the outer mating part. The outer peripheral wall of the outer tube 2 is provided with a first groove 211 that is recessed towards its center. The first groove 211 is arranged around the outer peripheral of the outer tube 2. The depth of the first groove 211 is small and is used to store the extruded aluminum chips generated by the interference fit.

[0048] In some embodiments, multiple first slots 211 may be provided, and the multiple first slots 211 are arranged along the axial direction of the outer tube 2, see [reference]. Figure 6 Two first slots 211 are set, the two first slots 211 are set adjacent to each other, and the two first slots 211 have the same depth.

[0049] In some embodiments, the outer peripheral wall of the outer tube 2 has a second groove 231 recessed towards its center. The second groove 231 is arranged around the outer periphery of the outer tube 2 and is used to accommodate the sealing ring. The second groove 231 is located below the first groove 211, and the second groove 231 and the first groove 211 are respectively close to the opposite ends of the outer tube 2. The second groove 231 is provided to facilitate the installation of the sealing O-ring.

[0050] In some embodiments, the outer tube 2 includes a first segment 21, a second segment 22 and a third segment 23 connected sequentially along its axial direction. The diameter of the first segment 21 is the same, the diameter of the second segment 22 gradually decreases from the first segment 21 to the third segment 23, and the diameter of the third segment 23 is the same. The diameter of the first segment 21 is larger than the diameter of the third segment 23. A first groove 211 is formed on the outer periphery of the first segment 21, and a second groove 231 is formed on the outer periphery of the third segment 23.

[0051] In some embodiments, the first segment 21 is provided with an upward inclined surface 212 at one end near the other end of the outer tube 2, and the diameter of the upward inclined surface 212 gradually increases from the first segment 21 to the third segment 23; the third segment 23 is provided with a downward inclined surface 232 at one end near the outer tube 2, and the diameter of the downward inclined surface 232 gradually decreases from the first segment 21 to the third segment 23. The inclined surfaces are provided to facilitate the mating of the bushing with the outer mating parts.

[0052] In this example, the intermediate buffer 3 is located between the inner core 1 and the outer tube 2, and the intermediate buffer 3 is made of rubber.

[0053] The intermediate buffer body 3 includes a main body 31. The upper end of the main body 31 does not protrude (extrude) from the upper end of the outer tube 2. Multiple upper protrusions 32 are provided on the upper surface of the main body 31. These upper protrusions 32 are preferably evenly distributed and arranged in a ring at the upper end of the main body 31. At least one upper protrusion 32 protrudes from the upper end of the main body 31, the upper end of the outer tube 2, and the upper end of the inner core 1. Multiple lower protrusions 33 are provided on the lower surface of the main body 31. These lower protrusions 33 are preferably evenly distributed and do not protrude (extrude) from the lower end of the outer tube 2. At least one lower protrusion 33 protrudes from the lower end of the main body 31, the lower end of the outer tube 2, and the lower end of the inner core 1. The upper and lower protrusions 32 and 33 effectively balance the axial stiffness and wear resistance requirements of the bushing and reduce noise.

[0054] In some embodiments, the multiple upper protrusions 32 are of different heights; that is, the distance between the top of some upper protrusions 32 and the upper end of the intermediate buffer 3 is not equal, while the distance between the top of some upper protrusions 32 and the upper end of the intermediate buffer 3 is equal. Similarly, the multiple lower protrusions 33 are of different heights; that is, the distance between the top of some lower protrusions 33 and the upper end of the intermediate buffer 3 is not equal, while the distance between the top of some lower protrusions 33 and the upper end of the intermediate buffer 3 is equal. After the bushing is assembled with the outer mating part 6, the upper protrusions 32 and lower protrusions 33 with greater height have higher rigidity and contact the outer mating part first, which can reduce noise; the upper protrusions 32 and lower protrusions 33 with smaller height have less deformation and better wear resistance.

[0055] In some embodiments, the plurality of upper protrusions 32 include a plurality of first upper protrusions and a plurality of second upper protrusions, the first upper protrusions and the second upper protrusions being arranged adjacent to each other, the height of the first upper protrusions being less than the height of the second upper protrusions, that is, the plurality of upper protrusions 32 are arranged alternately in a high-low-high-low pattern, the height of the plurality of first upper protrusions may be equal, and the height of the plurality of second upper protrusions may be equal; the plurality of lower protrusions 33 include a plurality of first lower protrusions and a plurality of second lower protrusions, the first lower protrusions and the second lower protrusions being arranged adjacent to each other, the height of the first lower protrusions being less than the height of the second lower protrusions, that is, the plurality of upper protrusions 32 are arranged alternately in a high-low-high-low pattern, the height of the plurality of first lower protrusions may be equal, and the height of the plurality of second lower protrusions may be equal.

[0056] See Figure 1 The upper convex body 32 protrudes upward in a convex arc or V shape, and the lower convex body 33 protrudes downward in a convex arc or V shape.

[0057] In some embodiments, an upper groove 124 is recessed downward on the upper end surface of the annular protrusion, and a lower groove 125 is recessed upward on the lower end surface of the annular protrusion. The upper groove 124 and the lower groove 125 are filled with an intermediate buffer body 3. The grooves can prevent the intermediate buffer body 3 from cracking.

[0058] See Figure 4 The upper end of the intermediate buffer body 3 has a downwardly recessed upper adjustment groove 311, and the lower end of the intermediate buffer body 3 has an upwardly recessed lower adjustment groove 312. The upper adjustment groove 311 and the lower adjustment groove 312 are provided to adjust the axial and radial height of the bushing. The upper adjustment groove 311 is closer to the outer tube 2 than the upper groove 124, and the lower adjustment groove 312 is closer to the outer tube 2 than the lower groove 125.

[0059] In this example, the radial and axial stiffness of the bushing is adjusted by means of the annular protrusion and the groove 123 of the annular protrusion as follows: if the radial stiffness of the bushing is reduced, the depth of the groove 123 is increased (the amount of rubber inside is increased), and the change in axial stiffness is small; if the axial height of the bushing is increased, the height h of the annular protrusion is increased, and the heights of the upper protrusion 32 and the lower protrusion 33 are relatively reduced; if the axial and radial stiffness of the bushing are adjusted at the same time, the height of the annular protrusion and the depth of the groove 123 of the annular protrusion can be adjusted.

[0060] In some embodiments, the outer tube 2 is made of aluminum, which has a certain strength, is corrosion-resistant, and is relatively easy to process, facilitating the creation of the first slot 211 and the second slot 231 on the outer circumferential wall of the outer tube 2. The inner core 1 is made of metal, preferably medium-carbon quenched and tempered steel, which has a certain degree of toughness and is a high-strength material. This high-strength material not only effectively avoids the risk of the inner core 1 breaking under axial extreme conditions, but also ensures that the connection between the damper rod, the clamping ring 7, and the nut 8 remains secure. The intermediate buffer body 3 is made of natural rubber, preferably a high-wear-resistant and high-resilience rubber compound, which better absorbs vertical impacts and vibrations, has good wear resistance, and reduces rubber cracking and wear.

[0061] In this example, the high wear-resistant top rubber bushing is integrally vulcanized from the inner core 1, the outer tube 2, and the intermediate buffer body 3.

[0062] The advantages of using bushings in this example of air damper are:

[0063] 1. By adjusting the height of the annular convex body, the axial stiffness performance of the bushing can be changed; by setting the upper and lower convex bodies, the axial stiffness performance and wear resistance performance requirements of the bushing can be effectively balanced, and abnormal noise can be avoided.

[0064] 2. By using the upper and lower protrusions of the intermediate buffer body to make interference contact with the corresponding external mating parts, unacceptable abnormal noises caused by the bushings in the passenger compartment during vehicle testing can be avoided; the noise level can be improved by changing the height of the intermediate buffer body and the height of the annular boss.

[0065] 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 bushing for an air damper, characterized in that, It includes an inner core, an intermediate buffer body and an outer tube. The inner core has a circular cross-section and includes a body and an annular protrusion. The annular protrusion surrounds the body and is disposed outside the body. The upper end face of the annular protrusion and the upper end face of the body maintain a distance. The lower end face of the annular protrusion and the lower end face of the body maintain a distance. A central hole is opened in the middle of the body. The intermediate buffer body is located between the inner core and the outer tube. The intermediate buffer body includes a main body, with multiple upper protrusions at the upper end and multiple lower protrusions at the lower end. The upper protrusions at the upper end of the main body are arranged in a ring, with at least one upper protrusion protruding from the upper end of the main body. The lower protrusions at the lower end of the main body are arranged in a ring, with at least one lower protrusion protruding from the lower end of the main body.

2. The bushing for an air damper according to claim 1, characterized in that, The inner wall of the central hole of the main body is provided with a receiving groove that is recessed towards the outer periphery of the inner core. The receiving groove is used to receive the sealing ring.

3. The bushing for an air damper according to claim 1, characterized in that, The plurality of upper protrusions include a plurality of first upper protrusions and a plurality of second upper protrusions, wherein the first upper protrusions and the second upper protrusions are arranged adjacent to each other, and the height of the first upper protrusions is less than the height of the second upper protrusions; The plurality of lower protrusions include a plurality of first lower protrusions and a plurality of second lower protrusions, wherein the first lower protrusions and the second lower protrusions are arranged adjacent to each other, and the height of the first lower protrusions is less than the height of the second lower protrusions.

4. The bushing for an air damper according to claim 1, characterized in that, The annular protrusion has a groove recessed towards the center of the body on its outer periphery, and the groove is arranged around the outer periphery of the annular protrusion.

5. The bushing for an air damper according to claim 4, characterized in that, The diameter of the groove gradually increases from near the center of the body to far away from the center of the body.

6. The bushing for an air damper according to claim 1, characterized in that, The outer peripheral wall of the outer tube has a first groove that is recessed toward its center, and the first groove is arranged around the outer periphery of the outer tube.

7. The bushing for an air damper according to claim 6, characterized in that, The outer peripheral wall of the outer tube has a second groove that is recessed towards its center. The second groove is arranged around the outer periphery of the outer tube and is used to accommodate the sealing ring.

8. The bushing for an air damper according to claim 7, characterized in that, The outer tube includes a first section, a second section, and a third section connected sequentially along its axial direction. The first section has a uniform diameter, the diameter of the second section gradually decreases from the first section to the third section, and the diameter of the third section is uniform. The first section has a first groove on its outer periphery, and the third section has a second groove on its outer periphery.

9. The bushing for an air damper according to claim 1, characterized in that, The annular protrusion has a downwardly recessed upper groove on its upper end face, and the annular protrusion has an upwardly recessed lower groove on its lower end face.

10. The bushing for an air damper according to claim 9, characterized in that, The upper end of the intermediate buffer body is provided with a downwardly recessed upper adjustment groove, and the lower end of the intermediate buffer body is provided with an upwardly recessed lower adjustment groove. The upper adjustment groove is closer to the outer tube than the upper groove, and the lower adjustment groove is closer to the outer tube than the lower groove.

Images