Sealing assembly of air spring and automobile shock absorber

Abstract

The utility model relates to a sealing assembly of an air spring and an automobile shock absorber applying the sealing assembly, the sealing assembly of the air spring comprises an end cover, an installation channel is arranged on the end cover, an electromagnetic valve is installed in the installation channel, and the sealing assembly of the air spring further comprises an elastic blocking cover which is matched with the installation channel in a sealing mode and is detachable. The elastic blanking cap is provided with a guide channel for the electromagnetic valve wire harness to penetrate through the elastic blanking cap, the guide channel obliquely extends from the upper surface of the elastic blanking cap to the direction close to the inner wall of the installation channel, and the center line L1 of the guide channel does not coincide with the center line L2 of the installation channel. The elastic blanking cap can be made of ethylene propylene diene monomer, gaps between the structures are made up through deformation of interference fit, the waterproof sealing performance is better, and the electromagnetic valve wire harness is convenient to disassemble and adjust. The guide channel enables the electromagnetic valve wire harness to be attached to the inner wall in the mounting channel, meanwhile, the electromagnetic valve wire harness can be conveniently attached to the upper surface of the elastic plug cover to be stored, the mounting efficiency is improved, and the sealing performance is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle shock absorption technology, specifically to a sealing assembly for an air spring and an automotive shock absorber. Background Technology

[0002] With the development of the times, people are paying more and more attention to the comfort of cars during driving. Closely related to comfort is the car's shock absorption system, making the research and development of shock absorbers particularly important. Among existing shock absorbers, air springs are commonly used. An air spring is a shock-absorbing element that is filled with compressed air and utilizes the compressibility of air to achieve an elastic buffering function. It bears the relative displacement between the vehicle body and the bogie through its own deformation.

[0003] The main structure of an air spring currently includes an air bladder. The air bladder needs to be inflated to maintain a certain working pressure during operation. An end cap is provided on the air bladder, and an installation channel for mounting a solenoid valve is provided on the end cap. This installation channel is sealed by a sealing structure after the solenoid valve is installed. The solenoid valve controls and regulates the direction, pressure, and flow rate of the gas, achieving dynamic control of the air spring's performance. For further information on the design and function of the end cap and solenoid valve in an air spring, please refer to the Chinese invention publication with application number 202411585869.7, entitled "Adaptive Stiffness Adjustable Multi-Cavity Air Spring".

[0004] The presence of an air spring sealing structure may make it inconvenient to route the solenoid valve wiring harness (from the solenoid valve to the outside of the end cap). If a through hole is made in the sealing structure for the solenoid valve wiring harness to pass through, the sealing performance of the sealing structure may decrease due to the frictional movement of the solenoid valve wiring harness, which will affect the normal operation of the shock absorber. Therefore, it is urgent to design a waterproof sealing structure for the air spring end cap with good sealing performance and convenient installation. Summary of the Invention

[0005] The purpose of this invention is to develop a sealing component for an air spring and an automotive shock absorber, in order to solve the problems of inconvenient installation and easy degradation of sealing performance caused by the sealing structure in the air spring of the shock absorber in the prior art, and to improve the sealing performance and ease of use of the air spring sealing structure.

[0006] This utility model is achieved through the following technical solution:

[0007] First, a sealing assembly for an air spring is provided, including an end cap with an installation channel in which a solenoid valve is installed. The assembly also includes an elastic plug that seals with the installation channel, the elastic plug being detachably connected to the installation channel. The elastic plug has a guide channel through which a solenoid valve wiring harness passes, the guide channel extending obliquely from the upper surface of the elastic plug towards the inner wall of the installation channel, such that the centerline L1 of the guide channel is not parallel to the centerline L2 of the installation channel.

[0008] The beneficial effects of the above technical solution are as follows: The elastic plug refers to a plug made of elastic material, such as EPDM rubber. The elastic plug is detachably connected to the installation channel. As a sealing structure of the installation channel of the end cap, compared with the rigid sealing structure, the elastic seal can make up for the gap between the structures through the deformation of the interference fit, resulting in better waterproof sealing performance. It is also convenient to adjust the solenoid valve harness by disassembling the elastic plug. The center line L1 of the guide channel is not parallel to the center line L2 of the installation channel, so that the guide channel is set at an angle relative to the installation channel. When the upper end of the solenoid valve harness passing through the guide channel is bent towards the upper surface of the elastic plug, the bending angle can be reduced (less than 90 degrees), avoiding damage to the harness due to excessive bending. Moreover, the lower end of the solenoid valve harness can be closer to the inner wall of the installation channel, reducing the swing (shaking) space of the harness. Compared with the vertically set guide channel, it is easier to bend and store the harness, improve installation efficiency, and reduce leakage caused by harness friction.

[0009] In one possible implementation, the angle α between the centerline L1 of the guide channel and the centerline L2 of the installation channel is 15-25°; within this angle range, the contact stress distribution of the solenoid valve harness is optimal, installation is convenient, and the guiding effect is good, achieving the best balance between guiding performance and sealing performance.

[0010] In one possible implementation, the inner wall of the installation channel is provided with a plurality of protrusions arranged in a ring, and the outer peripheral wall of the elastic plug is provided with an annular groove that limits and cooperates with the plurality of protrusions. Through the protrusion-annular groove limiting structure, the end cap and the elastic plug are stably connected, and the air spring is kept in a stable sealing state. The annularly distributed protrusions form a circumferential load-sharing structure, and the contact of multiple protrusions improves the sealing performance and is easy to assemble.

[0011] In one possible implementation, the resilient plug has a tapered recess, and the guide channel is located at the tip of the tapered recess; this can guide the solenoid valve wiring harness during installation, and the guide channel at the tip is more precise, improving the sealing effect, preventing misalignment, ensuring smooth entry of the solenoid valve wiring harness, reducing twisting or wear, and improving the consistency of the overall structure.

[0012] In one possible implementation, the surface of the elastic plug is further provided with a fixing part for limiting the solenoid valve wiring harness. When the solenoid valve wiring harness passes through the guide channel to the position above the elastic plug, the solenoid valve wiring harness extends obliquely relative to the upper surface of the elastic plug. The oblique direction of the solenoid valve wiring harness is towards the fixing part, which facilitates the limiting cooperation between the solenoid valve wiring harness and the fixing part, simplifies the installation steps, improves the operating efficiency, and at the same time stabilizes the wiring harness and prevents movement.

[0013] In one possible implementation, the guide channel is eccentrically positioned relative to the centerline of the elastic plug, and the guide channel and the fixing part are respectively located on the radial sides of the centerline L2 of the installation channel, so that a longer bending portion is reserved before the solenoid valve harness is positioned by the fixing part, reducing the damage to the solenoid valve harness caused by bending, and allowing the lower end of the solenoid valve harness to be closer to the inner wall of the installation channel.

[0014] In one possible implementation, the fixing part is a slot provided on the surface of the elastic plug, and the center line L2 of the installation channel coincides with the center line of the elastic plug; the projections of the center line of the slot, the center of the elastic plug, and the center line L1 of the guide channel onto the surface of the elastic plug are all on the same virtual straight line L3.

[0015] The end cap has a central portion and an outer ring portion surrounding the central portion, with the outer ring portion protruding annularly from the surface of the central portion. The mounting channel is located in the central portion. A guide groove for limiting the solenoid valve wiring harness is formed on the surface of the central portion. A positioning groove for positioning the solenoid valve wiring harness is provided on the outer ring portion corresponding to the guide groove. The positioning groove can be snapped into position with the solenoid valve wiring harness, or used for interference fit positioning, enhancing stability, preventing pipe shaking and detachment, and improving sealing performance.

[0016] In the above feasible implementation scheme, the elastic plug can be integrally formed of EPDM rubber material.

[0017] A car shock absorber is also provided, including an air spring, on which a sealing assembly of the air spring as described in the above feasible embodiments is provided; applying the sealing assembly of the air spring in the above embodiments to the car shock absorber directly improves the waterproofness and reliability of the shock absorber, and indirectly improves the safety and comfort of the vehicle. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of the sealing assembly of the air spring provided by this utility model;

[0019] Figure 2 for Figure 1 Cross-sectional view of the sealing assembly of the air spring;

[0020] Figure 3 for Figure 2 Schematic diagram of the middle plug structure;

[0021] Figure 4 for Figure 1 Exploded view of the sealing assembly of an air spring;

[0022] Figure 5 for Figure 1 Exploded cross-sectional view of the sealing assembly of an air spring;

[0023] Figure 6 for Figure 1 Top view of the sealing assembly of the air spring.

[0024] In the diagram, 1 is the end cap; 101 is the mounting channel; 11 is the protrusion; 12 is the guide groove; 13 is the positioning groove; 14 is the outer ring; 15 is the center; 2 is the elastic plug; 201 is the guide channel; 202 is the oblique conical recess; 21 is the annular groove; 22 is the fixing part; 3 is the solenoid valve; 31 is the sealing ring; 32 is the solenoid valve wiring harness. Detailed Implementation

[0025] First, those skilled in the art should understand that the following embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0027] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] To make the objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments are described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 3 As shown, this embodiment provides a sealing assembly for an air spring, including an end cap 1. The end cap 1 has an installation channel 101, in which a solenoid valve 3 is installed. A sealing ring 31 is provided between the solenoid valve 3 and the inner wall of the installation channel 101. The assembly also includes an elastic plug 2 that seals with the installation channel 101. The elastic plug 2 is detachably connected to the installation channel 101. The elastic plug 2 has a guide channel 201 through which the solenoid valve wiring harness 32 passes. The guide channel 201 extends obliquely from the upper surface of the elastic plug 2 toward the inner wall of the installation channel 101, so that the center line L1 of the guide channel 201 is not parallel to the center line L2 of the installation channel 101. For example, in this embodiment, the included angle α between L1 and L2 is an acute angle.

[0030] An elastic plug refers to a plug made of elastic material, including elastic materials. In this embodiment, EPDM rubber is used to injection mold the elastic plug, which has good wear resistance, oxidation resistance, and corrosion resistance, and can maintain its performance stability in harsh environments with high and low temperatures. It has good chemical resistance and low water absorption. It has good processing performance and is easy to process and mold. It has low density and light weight. Moreover, this type of plug has a simple structural design, is easy to mold, has good sealing performance, and is easy to install using an interference fit.

[0031] In this embodiment, the projection of the elastic plug 2 onto the horizontal plane is circular, and the center line L2 of the installation channel 101 passes through the center of the elastic plug 2; and the projection of the center line L1 of the guide channel 201 onto the surface of the elastic plug 2 is on the same virtual straight line as the radius of the elastic plug 2; that is, the elastic plug and the installation channel 101 are coaxially arranged, and the guide channel 201 extends from a position close to the center to a position away from the center, and the extension path is on the same virtual straight line as the radius of the elastic plug 2.

[0032] In one embodiment, the included angle α between the centerline L1 of the guide channel 201 and the centerline L2 of the mounting channel 101 is 20°. The 20° included angle is the optimal angle obtained from the experiment. Under this angle, the contact stress distribution of the solenoid valve wiring harness is optimal, the installation is convenient, the guiding effect is good, and the best balance between guiding performance and sealing performance is achieved.

[0033] like Figure 4 , Figure 5 As shown, in one embodiment, the inner wall of the installation channel 101 is provided with a plurality of protrusions 11 arranged in a ring, and the outer peripheral wall of the elastic plug 2 is provided with an annular groove 21 that fits in a limiting manner with the protrusions 11; the annularly distributed protrusions form a circumferential load-bearing structure, and the contact of multiple protrusions improves the sealing performance and is easy to assemble.

[0034] like Figure 3 , Figure 4 As shown, in one embodiment, the elastic plug 2 has a tapered recess 202, and the guide channel 201 is formed at the tip of the tapered recess 202. In this embodiment, the length of the projection line segment of the centerline L1 of the guide channel 201 onto the surface of the elastic plug 2 is less than the radius of the elastic plug 2. The tapered recess 202 guides the solenoid valve wiring harness 32 during installation. Simultaneously, the guide channel at the tip is more precise, improving the sealing effect, preventing misalignment, ensuring smooth entry of the solenoid valve wiring harness, reducing twisting or wear, and improving the overall structural consistency.

[0035] like Figure 4 , Figure 6 As shown, in one embodiment, the surface of the elastic plug 2 is provided with a slot (fixing part 22) for embedding the solenoid valve harness 32; the center line of the slot, the center of the elastic plug 2, and the projection of the center line L1 of the guide channel 201 onto the surface of the elastic plug 2 are all on the same virtual straight line L3; this facilitates the embedding of the solenoid valve harness 32 and the locking part to form a snap-fit ​​engagement. Furthermore, the guide channel 201 is eccentrically set relative to the center line of the elastic plug 2 (the guide channel 201 is also eccentrically set relative to the center line L2 of the mounting channel 101), so that the lower opening of the guide channel 201 can be closer to the inner wall of the mounting channel 101. The guide channel 201 and the fixing part 22 are respectively located on the radial sides of the center line L2 of the mounting channel 101, so that the solenoid valve harness 32 has a longer bending portion before being positioned by the fixing part 22, reducing the damage to the solenoid valve harness 32 caused by bending. In this embodiment, the projections of the centerline of the slot, the center of the elastic plug 2, and the centerline L1 of the guide channel 201 onto the surface of the elastic plug 2 are all on the same virtual straight line L3, which facilitates the insertion of the solenoid valve harness 32 into the slot to form a snap-fit ​​engagement.

[0036] Furthermore, in this embodiment, the end cap 1 has a central portion 15 and an outer ring portion 14 located around the central portion 15, and the outer ring portion 14 protrudes annularly from the surface of the central portion 15. The mounting channel 101 is opened in the central portion 15. A guide groove 12 for limiting the solenoid valve wiring harness 32 is opened on the surface of the central portion. A positioning groove 13 for positioning the solenoid valve wiring harness 32 is provided on the outer ring portion 14 corresponding to the guide groove 12. The positioning groove can be snapped into the solenoid valve wiring harness 32 for positioning, or can be positioned by interference fit, to enhance stability, prevent pipe shaking and falling off, and improve sealing performance.

[0037] In one embodiment, an automotive shock absorber is provided, including an air spring, wherein the air spring is provided with a sealing assembly as described in the above embodiments, which directly improves the waterproofness and reliability of the shock absorber, and indirectly improves the safety and comfort of the vehicle.

[0038] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0039] In the description of this application, the reference to terms such as "this embodiment," "an embodiment," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sealing assembly for an air spring, comprising an end cap (1), wherein an installation channel (101) is provided on the end cap (1), and a solenoid valve (3) is installed in the installation channel (101), characterized in that: It also includes an elastic plug (2) that seals with the mounting channel (101), the elastic plug (2) being detachably connected to the mounting channel (101); The elastic plug (2) has a guide channel (201) for the solenoid valve wiring harness (32) to pass through the elastic plug (2). The guide channel (201) extends obliquely from the upper surface of the elastic plug (2) toward the inner wall of the mounting channel (101). The center line L1 of the guide channel (201) is not parallel to the center line L2 of the mounting channel (101).

2. The sealing assembly of the air spring according to claim 1, characterized in that: The angle α between the centerline L1 of the guide channel (201) and the centerline L2 of the installation channel (101) is 15-25°.

3. The sealing assembly of the air spring according to claim 1, characterized in that: The inner wall of the installation channel (101) is provided with a number of protrusions (11) arranged in a ring, and the outer peripheral wall of the elastic plug (2) is provided with an annular groove (21) that is matched with the number of protrusions (11).

4. The sealing assembly of the air spring according to claim 1, characterized in that: The elastic plug (2) has a conical recess (202), and the guide channel (201) is opened at the tip of the conical recess (202).

5. The sealing assembly of the air spring according to claim 1, characterized in that: The surface of the elastic plug (2) is also provided with a fixing part (22) for limiting the solenoid valve harness (32). When the solenoid valve harness (32) passes through the guide channel (201) to the position above the elastic plug (2), the solenoid valve harness (32) extends obliquely relative to the upper surface of the elastic plug (2), and the tilting direction of the solenoid valve harness (32) is towards the fixing part (22).

6. The sealing assembly of the air spring according to claim 5, characterized in that: The guide channel (201) is eccentrically positioned relative to the center line of the elastic plug (2), and the guide channel (201) and the fixing part (22) are respectively located on the radial sides of the center line of the elastic plug (2).

7. The sealing assembly of the air spring according to claim 6, characterized in that: The centerline L2 of the installation channel (101) coincides with the centerline of the elastic plug (2); The fixing part (22) is a slot; the center line of the slot, the center of the elastic plug (2), and the projection of the center line L1 of the guide channel (201) onto the surface of the elastic plug (2) are all on the same virtual straight line L3.

8. The sealing assembly of the air spring according to claim 1, characterized in that: The end cap (1) has a central portion (15) and an outer ring portion (14) located around the central portion (15), and the outer ring portion (14) protrudes annularly from the surface of the central portion (15), and the mounting channel (101) is opened in the central portion (15). The central part surface is provided with a guide groove (12) for limiting the solenoid valve wiring harness (32). The outer ring (14) is provided with a positioning groove (13) for positioning the solenoid valve harness (32) at the location corresponding to the guide groove (12).

9. The sealing assembly of the air spring according to any one of claims 1-8, characterized in that: The elastic plug (2) is integrally formed of EPDM rubber material.

10. A car shock absorber, characterized in that, It includes an air spring, wherein the air spring is provided with a sealing assembly as described in any one of claims 1-8.

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