Wear-resistant PTFE shock absorber piston sealing structure

Abstract

The utility model relates to hydraulic shock absorber technical field, specifically disclose a wear -resisting type PTFE shock absorber piston sealing structure, including sealing element body, the cross section of sealing element body includes inside and outside in turn three layer co -extrusion composite structure of inner support layer, intermediate elastic layer and outer friction layer, the radial friction outer circumferential surface of outer friction layer is provided with pit array, the inner support layer is composed of high rigidity PTFE composite material, the outer friction layer is composed of low friction coefficient PTFE material, the intermediate elastic layer is composed of low density porous PTFE material, through multilayer composite structure and surface optimization, wear resistance and sealing durability have been improved significantly, effectively overcome the inherent wear resistance of PTFE material, poor heat conduction and weak anti -creep problem such as, thereby prolong the shock absorber life, enhance the ride smoothness and safety, reduce the maintenance demand simultaneously, be applicable to various harsh working conditions.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic shock absorber technology, and specifically discloses a wear-resistant PTFE shock absorber piston sealing structure. Background Technology

[0002] Shock absorbers are a core component of modern vehicle suspension systems, and their performance directly determines ride comfort, safety, and ride quality. The piston seal structure, as a key internal component of the shock absorber, plays a crucial role in maintaining oil sealing, controlling damping force, and withstanding lateral piston forces. Its performance, especially its wear resistance and seal durability, has a decisive impact on the shock absorber's efficiency and lifespan. Polytetrafluoroethylene (PTFE), due to its extremely low coefficient of friction, excellent chemical corrosion resistance, and self-lubricating properties, has been widely used in the manufacture of high-performance piston seals, becoming an important technological direction in this field.

[0003] However, despite the numerous advantages of PTFE, traditional seals made from this single material still exhibit a series of inherent defects under long-term, harsh reciprocating motion conditions. First, PTFE itself has generally low wear resistance and poor thermal conductivity, making it difficult to dissipate heat generated by friction, which easily leads to thermal expansion and accelerated wear. Second, PTFE has poor creep resistance (cold flow resistance), making it prone to permanent deformation under long-term high pressure, resulting in seal failure. Furthermore, its low elastic modulus limits its ability to compensate for dimensional tolerances in mounting grooves and cylinders, making it difficult to maintain the initial preload and sealing effect. Utility Model Content

[0004] This invention proposes a wear-resistant PTFE shock absorber piston sealing structure. Through multi-layer composite structure and surface optimization, it significantly improves wear resistance and sealing durability, effectively overcoming the inherent problems of poor wear resistance, poor thermal conductivity and weak creep resistance of PTFE material. This extends the life of the shock absorber, enhances driving smoothness and safety, and reduces maintenance requirements, making it suitable for various harsh working conditions.

[0005] This invention is implemented as follows: a wear-resistant PTFE shock absorber piston sealing structure includes a sealing body. The cross-section of the sealing body, from the inside to the outside, includes a three-layer co-extruded composite structure consisting of an inner support layer, an intermediate elastic layer, and an outer friction layer. The radial friction outer circumferential surface of the outer friction layer is provided with an array of pits. The inner support layer is made of high-hardness PTFE composite material, the outer friction layer is made of low-friction coefficient PTFE material, and the intermediate elastic layer is made of low-density porous PTFE material.

[0006] In a preferred embodiment of the wear-resistant PTFE shock absorber piston sealing structure of this utility model, the hardness of the inner support layer is greater than the hardness of the outer friction layer.

[0007] In a preferred embodiment of the wear-resistant PTFE shock absorber piston sealing structure of this utility model, the thickness ratio of the inner support layer, the intermediate elastic layer, and the outer friction layer is 5:3:2.

[0008] As a preferred embodiment of the wear-resistant PTFE shock absorber piston sealing structure of this utility model, the pits in the pit array are uniformly distributed blind holes with a diameter of 50-100μm and a depth of 30-50μm.

[0009] As a preferred embodiment of the wear-resistant PTFE shock absorber piston sealing structure of this utility model, both the upper and lower end faces of the sealing element body are provided with annular oil storage grooves concentrically arranged with the sealing element body.

[0010] In a preferred embodiment of the wear-resistant PTFE shock absorber piston sealing structure of this utility model, the cross-section of the oil storage groove is trapezoidal.

[0011] The beneficial effects of this utility model are:

[0012] The outer friction layer uses low-friction coefficient PTFE material to reduce motion resistance, and combined with the pit array on the outer friction layer to store lubricating oil for continuous surface lubrication, thereby significantly improving the wear resistance, sealing durability and overall life of the seal. Through multi-layer composite structure and surface optimization, wear resistance and sealing durability are significantly improved, effectively overcoming the inherent problems of poor wear resistance, poor thermal conductivity and weak creep resistance of PTFE material, thereby extending the life of the shock absorber, enhancing driving smoothness and safety, while reducing maintenance requirements, and making it suitable for various harsh working conditions. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a structural diagram of the present invention;

[0015] Figure 2 This is an enlarged structural diagram of part a of this utility model.

[0016] The markings in the diagram are: 1. Seal body; 2. Inner support layer; 3. Intermediate elastic layer; 4. Outer friction layer; 5. Dent array; 6. Oil storage groove. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0018] Please see Figure 1-2 A wear-resistant PTFE shock absorber piston sealing structure includes a sealing body 1. The cross-section of the sealing body 1 includes, from the inside to the outside, a three-layer co-extruded composite structure consisting of an inner support layer 2, an intermediate elastic layer 3, and an outer friction layer 4. The outer friction layer 4 has a pit array 5 on its radial friction outer circumferential surface. The inner support layer 2 is made of high-hardness PTFE composite material, the outer friction layer 4 is made of low-friction coefficient PTFE material, and the intermediate elastic layer 3 is made of low-density porous PTFE material.

[0019] In this embodiment: the inner support layer 2 uses a high-hardness PTFE composite material to provide rigid support to prevent deformation; the intermediate elastic layer 3 uses a low-density porous PTFE material to impart elasticity to compensate for dimensional tolerances and absorb vibration; the outer friction layer 4 uses a low-friction coefficient PTFE material to reduce motion resistance, and the pit array 5 on the outer friction layer 4 stores lubricating oil to continuously lubricate the surface, thereby significantly improving the wear resistance, sealing durability and overall life of the seal. Through the multi-layer composite structure and surface optimization, the wear resistance and sealing durability are significantly improved, effectively overcoming the inherent problems of poor wear resistance, poor thermal conductivity and weak creep resistance of PTFE material, thereby extending the life of the shock absorber, enhancing driving smoothness and safety, and reducing maintenance requirements, making it suitable for various harsh working conditions.

[0020] As a technical optimization of this utility model, the hardness of the inner support layer 2 is greater than that of the outer friction layer 4.

[0021] In this embodiment, the hardness of the inner support layer 2 is higher than that of the outer friction layer 4. The internal rigid support of the outer soft layer balances the structural strength and friction performance, enhances the overall resistance to deformation, and maintains the low friction characteristics of the outer layer to avoid sealing failure.

[0022] As a technical optimization of this utility model, the thickness ratio of the inner support layer 2, the intermediate elastic layer 3 and the outer friction layer 4 is in the range of 5:3:2.

[0023] In this embodiment, the thickness ratio of the inner support layer 2, the intermediate elastic layer 3, and the outer friction layer 4 is set to 5:3:2. This optimizes the material distribution between the layers, ensuring sufficient support, elastic compensation, and friction control, thereby improving structural stability and sealing consistency.

[0024] As a technical optimization of this utility model, the pits in the pit array 5 are uniformly distributed blind holes with a diameter of 50-100μm and a depth of 30-50μm.

[0025] In this embodiment, the pits in the pit array 5 are designed as uniformly distributed blind holes with a diameter of 50-100μm and a depth of 30-50μm. This microstructure stores oil, effectively captures and releases lubricating oil, reduces direct friction and heat accumulation, and lowers the wear rate.

[0026] As a technical optimization of this utility model, the upper and lower end faces of the sealing body 1 are provided with annular oil storage grooves 6 that are concentrically arranged with the sealing body 1.

[0027] In this embodiment, concentric annular oil storage grooves 6 are provided on the upper and lower end faces of the sealing body 1 to increase additional oil storage space, provide continuous lubrication supply, enhance the oil film retention capability of the sealing interface, and reduce the effects of friction and thermal expansion.

[0028] As a technical optimization of this utility model, the cross-section of the oil storage trench 6 is trapezoidal.

[0029] In this embodiment, the cross-section of the oil storage groove 6 adopts a trapezoidal design, which optimizes oil retention by utilizing geometry, prevents oil loss, and further improves lubrication efficiency and sealing reliability.

[0030] The working principle and usage process of this utility model are as follows: When the piston of the shock absorber reciprocates, the outer friction layer 4 of the sealing body 1 is in direct contact with the inner wall of the cylinder. The pit array 5 on its surface captures oil and forms a lubricating film during the movement, reducing frictional resistance. At the same time, the intermediate elastic layer 3 undergoes elastic deformation according to pressure changes, absorbing lateral forces and vibrations, and compensating for installation tolerances. The inner support layer 2 provides stable support, prevents overall structural deformation, and ensures that the sealing component maintains the consistency of preload and sealing interface under high pressure and high temperature environments.

[0031] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0032] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A wear-resistant PTFE shock absorber piston sealing structure, comprising a sealing body (1), characterized in that: The cross-section of the sealing body (1) consists of a three-layer co-extruded composite structure consisting of an inner support layer (2), an intermediate elastic layer (3), and an outer friction layer (4) from the inside to the outside. The outer friction layer (4) has a pit array (5) on its radial friction outer circumferential surface. The inner support layer (2) is made of high-hardness PTFE composite material, the outer friction layer (4) is made of low-friction coefficient PTFE material, and the intermediate elastic layer (3) is made of low-density porous PTFE material.

2. The wear-resistant PTFE shock absorber piston sealing structure according to claim 1, characterized in that: The hardness of the inner support layer (2) is greater than that of the outer friction layer (4).

3. The wear-resistant PTFE shock absorber piston sealing structure according to claim 1, characterized in that: The thickness ratio of the inner support layer (2), the intermediate elastic layer (3), and the outer friction layer (4) is 5:3:

2.

4. The wear-resistant PTFE shock absorber piston sealing structure according to claim 1, characterized in that: The pits in the pit array (5) are uniformly distributed blind holes with a diameter of 50-100μm and a depth of 30-50μm.

5. The wear-resistant PTFE shock absorber piston sealing structure according to claim 1, characterized in that: The upper and lower end faces of the sealing body (1) are provided with annular oil storage grooves (6) that are concentrically arranged with the sealing body (1).

6. The wear-resistant PTFE shock absorber piston sealing structure according to claim 5, characterized in that: The cross-section of the oil storage trench (6) is trapezoidal.

Images