Novel static seal structure for oil hydraulic shock absorber

Abstract

The application discloses a new static sealing structure of an oil pressure shock absorber, relates to the technical field of oil pressure shock absorbers, and comprises an oil storage cylinder and a guide seat, a piston rod is arranged in the oil storage cylinder and the guide seat, a sealing gasket corresponding to the inner side wall of the oil storage cylinder is arranged at the end of the guide seat, a guide inclined surface is arranged on the inner and outer ring side walls of the sealing gasket, sealing ring one and sealing ring two corresponding to the outer side of the guide seat and the inner side of the oil storage cylinder are arranged at the positions of the guide inclined surfaces, respectively, and a sealing end cover is arranged at the end of the oil storage cylinder. Sealing ring one and sealing ring two are sealed between the oil storage cylinder and the guide seat, positioning is more flexible during installation, the whole profile does not need to be strictly aligned like a flat sealing gasket, the knocking damage in the installation process can be reduced, the assembly efficiency is improved, precise sealing can be realized for the contact gaps of the guide seat and the sealing gasket and the oil storage cylinder and the sealing gasket, respectively, and the risk of oil leakage is significantly reduced.

Description

Technical Field

[0001] This application relates to the field of hydraulic vibration damper technology, and in particular to a novel static sealing structure for hydraulic vibration dampers. Background Technology

[0002] Hydraulic vibration dampers are key vibration damping components in vehicles, construction machinery, and other equipment. Their working principle involves generating damping force through the flow of internal oil between different chambers to attenuate vibrations and ensure the stability and safety of equipment operation. The static sealing structure is a core component that prevents oil leakage at fixed connections such as the oil reservoir and guide seat. Its sealing performance directly affects the damper's efficiency and service life, making it a crucial aspect of hydraulic vibration damper design.

[0003] Currently, static sealing in hydraulic shock absorbers is mostly achieved using flat rubber gaskets. A typical design for this structure is as follows: the flat rubber gasket is ring-shaped and sandwiched between the oil reservoir and the guide seat during assembly. The rubber gasket deforms due to the tightening force of external connectors. Its outer ring adheres to the inner wall or threaded surface of the oil reservoir to form an external seal, while its inner ring adheres to the outer wall of the guide seat to form an internal seal, thereby blocking the leakage path of the oil.

[0004] Regarding the aforementioned technologies, the inventors believe that the flat rubber pad must be strictly aligned with the contours of the oil reservoir and the guide seat, as positional misalignment during assembly can easily affect the sealing effect. Utility Model Content

[0005] The purpose of this application is to provide a new static sealing structure for hydraulic shock absorbers, in order to improve the problem that the flat rubber pad needs to be strictly aligned with the contours of the oil reservoir and guide seat, and that the sealing effect is easily affected by positional misalignment during assembly.

[0006] The novel static sealing structure for the hydraulic shock absorber provided in this application adopts the following technical solution:

[0007] A novel static sealing structure for a hydraulic shock absorber includes an oil reservoir and a guide seat. A piston rod is disposed in the oil reservoir and the guide seat. A sealing gasket corresponding to the inner sidewall of the oil reservoir is disposed at the end of the guide seat. Guide slopes are formed on the inner and outer sidewalls of the sealing gasket. A sealing ring one and a sealing ring two corresponding to the outer side of the guide seat and the inner side of the oil reservoir are respectively disposed at the position of the guide slope. A sealing end cap is disposed at the end of the oil reservoir.

[0008] By adopting the above technical solution, guide slopes are set on the inner and outer sidewalls of the sealing gasket, and sealing ring one and sealing ring two are configured accordingly to seal between the gasket and the oil reservoir and the guide seat. The positioning during installation is more flexible, and it does not require strict alignment of the overall contour as with flat sealing gaskets, which can reduce the impact damage during installation and improve assembly efficiency. It can achieve precise sealing of the contact gap between the guide seat and the sealing gasket, and between the oil reservoir and the sealing gasket, respectively, which significantly reduces the risk of oil leakage.

[0009] Optionally, an annular groove is formed around the piston rod on the outer side of the guide seat, the sealing gasket is in contact with the inner wall of the annular groove, the first sealing ring abuts against the inner wall of the annular groove, and the second sealing ring abuts against the inner wall of the oil reservoir.

[0010] By adopting the above technical solution, the annular groove on the outer side of the guide seat can circumferentially position the sealing gasket, preventing radial displacement of the sealing gasket during assembly or operation, and ensuring its fitting accuracy with the guide seat. At the same time, the inner wall of the annular groove provides a stable support surface for the first sealing ring, allowing the first sealing ring to tightly abut against the inner wall of the annular groove, avoiding local sealing failure caused by displacement of the first sealing ring. The second sealing ring directly abuts against the inner wall of the oil reservoir, and together with the positioning function of the annular groove, further ensures the independence and reliability of the inner and outer sealing paths, reducing the impact of assembly errors on the sealing effect.

[0011] Optionally, the first sealing ring and the second sealing ring are arranged concentrically, and the cross-sections of the first sealing ring and the second sealing ring are circular.

[0012] By adopting the above technical solution, the concentric arrangement of sealing ring one and sealing ring two can ensure that they bear the clamping force of the sealing end cap evenly when under stress, avoiding excessive or insufficient local pressure caused by eccentricity and reducing abnormal wear of the sealing ring; the circular cross-section design gives the sealing ring better elastic deformation ability. Compared with flat or irregular cross-sections, the circular cross-section can transmit pressure more evenly and can expand evenly in all directions when under pressure, better filling the tiny gaps in the sealing surface.

[0013] Optionally, the sealing end cap is disposed between the circumferential sidewall of the annular groove and the inner sidewall of the oil reservoir and abuts against the sealing gasket.

[0014] By adopting the above technical solution, the sealing end cap is set between the circumferential side wall of the annular groove and the inner side wall of the oil reservoir. The axial clamping force is directly applied to the sealing gasket, which makes the contact surfaces of the sealing gasket, sealing ring, guide seat and oil reservoir fit more tightly, restricts the radial displacement of the sealing end cap itself, and ensures the stable transmission of its clamping force.

[0015] Optionally, the sealing end cap is provided with a sealing gasket on the side facing the annular groove, which presses against the first sealing ring and the second sealing ring.

[0016] By adopting the above technical solution, the sealing gasket can distribute the clamping force of the sealing end cap to the first sealing ring and the second sealing ring, avoiding local pressure concentration caused by direct contact between the sealing end cap and the sealing ring, and reducing damage to the sealing ring caused by excessive compression.

[0017] Optionally, the inner wall of the oil reservoir has a smooth surface corresponding to the sealing gasket and the sealing ring, and the oil reservoir has threaded grooves on both sides of the smooth surface that are threaded to the guide seat and the sealing end cover.

[0018] By adopting the above technical solution, the smooth surface of the inner wall of the oil reservoir reduces the frictional resistance and wear between the sealing ring 2 and the oil reservoir, and extends the service life of the sealing ring 2. At the same time, the smooth surface can reduce the resistance of the sealing ring 2 when deforming, making it easier to fit the sealing surface and improve the sealing effect. The threaded grooves on both sides of the oil reservoir ensure that the guide seat and the sealing end cover can be stably assembled through threaded connection, providing continuous and adjustable preload.

[0019] Optionally, the diameter of the first sealing ring and the second sealing ring is greater than the height of the guide slope of the sealing gasket.

[0020] By adopting the above technical solution, the diameter of sealing rings one and two is greater than the height of the guide slope of the sealing gasket, so that the sealing ring will be pre-deformed by the sealing end cap and the sealing gasket during assembly, forming initial sealing pressure and ensuring tight fit with the sealing surface.

[0021] Optionally, the first sealing ring and the second sealing ring are made of elastic nitrile rubber or fluororubber material. When the first sealing ring and the second sealing ring are squeezed by the sealing gasket, the smooth surface of the oil reservoir and the guide seat are deformed along the guide slope to compensate for the deformation.

[0022] By adopting the above technical solution, the sealing rings one and two made of elastic material have excellent deformation ability. When squeezed by the sealing gasket, they can adapt to the deformation along the guide slope towards the smooth surface of the oil reservoir and the guide seat. This can compensate for the small displacement of the sealing surface caused by processing errors, assembly deviations or vibrations, ensuring that the sealing ring is always in close contact with the sealing surface. The guiding effect of the guide slope makes the deformation direction of the sealing ring more precise, avoiding local sealing failure caused by irregular deformation, and significantly improving the adaptability of the sealing structure to complex working conditions and the sealing reliability.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Guide bevels are provided on the inner and outer sidewalls of the sealing gasket, and sealing ring one and sealing ring two are configured accordingly to seal between the gasket and the oil reservoir and the guide seat. The positioning is more flexible during installation. Unlike flat sealing gaskets, it does not need to be strictly aligned with the overall contour, which can reduce the impact damage during installation and improve assembly efficiency. It can achieve precise sealing of the contact gap between the guide seat and the sealing gasket, and between the oil reservoir and the sealing gasket, significantly reducing the risk of oil leakage.

[0025] 2. The concentric arrangement of sealing ring one and sealing ring two ensures that they bear the clamping force of the sealing end cap evenly when under stress, avoiding excessive or insufficient local pressure due to eccentricity and reducing abnormal wear of the sealing rings.

[0026] 3. The sealing gasket can distribute the clamping force of the sealing end cap to the first sealing ring and the second sealing ring, avoiding local pressure concentration caused by direct contact between the sealing end cap and the sealing ring, and reducing damage to the sealing ring caused by excessive compression. Attached Figure Description

[0027] Figure 1 This is a planar sectional view of the novel static sealing structure of the hydraulic shock absorber;

[0028] Figure 2 yes Figure 1 A magnified view of part A in the middle.

[0029] In the diagram, 1 is the oil reservoir; 11 is the smooth surface; 12 is the threaded groove; 2 is the guide seat; 21 is the annular groove; 3 is the piston rod; 4 is the sealing gasket; 41 is the guide slope; 42 is the sealing gasket; 5 is the first sealing ring; 6 is the second sealing ring; and 7 is the sealing end cap. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail below.

[0031] The new static sealing structure of the hydraulic shock absorber is based on... Figure 1 and Figure 2The system includes an oil reservoir 1 and a guide seat 2. A smooth surface 11 corresponding to the sealing gasket 4 and the second sealing ring 6 is provided on the inner wall of the oil reservoir 1. Threaded grooves 12 are provided on both sides of the smooth surface 11 of the oil reservoir 1. The guide seat 2 is threadedly connected to the inner thread of the oil reservoir 1 to fix the guide seat 2. A piston rod 3 with a piston is installed in the oil reservoir 1 and the guide seat 2. A sealing gasket 4 corresponding to the inner wall of the oil reservoir 1 is provided at the end of the guide seat 2. Guide inclined surfaces 41 are provided on the inner and outer side walls of the sealing gasket 4. Sealing ring 5 and the second sealing ring 6 corresponding to the outer side of the guide seat 2 and the inner side of the oil reservoir 1 are respectively installed at the guide inclined surfaces 41. Sealing ring 5 and the second sealing ring 6 are made of elastic nitrile rubber or fluororubber. A metal sealing end cap 7 is threadedly connected to the end of the oil reservoir 1.

[0032] Reference Figure 2 An annular groove 21 is formed around the piston rod 3 on the outside of the guide seat 2. The sealing gasket 4 fits against the inner wall of the annular groove 21. The first sealing ring 5 abuts against the inner wall of the annular groove 21, and the second sealing ring 6 abuts against the inner wall of the oil reservoir 1. The first sealing ring 5 and the second sealing ring 6 are arranged concentrically, and the cross-section of the first sealing ring 5 and the second sealing ring 6 is circular. The sealing end cap 7 is set between the circumferential side wall of the annular groove 21 and the inner wall of the oil reservoir 1 and abuts against the sealing gasket 4. The axial clamping force is directly applied to the sealing gasket 4, which makes the contact surfaces of the sealing gasket 4, the sealing ring and the guide seat 2 and the oil reservoir 1 fit more tightly.

[0033] Reference Figure 2 A sealing gasket 42 is installed on the side of the sealing end cap 7 facing the annular groove 21, pressing against the sealing ring 5 and the sealing ring 6. The diameter of the sealing ring 5 and the sealing ring 6 is larger than the height of the guide slope 41 of the sealing gasket 4, so that the sealing ring will be pre-deformed by the sealing end cap 7 and the sealing gasket 4 during assembly, forming an initial sealing pressure to ensure a tight fit with the sealing surface. When the sealing ring 5 and the sealing ring 6 are pressed by the sealing gasket 42, they deform along the guide slope 41 towards the smooth surface 11 of the oil reservoir 1 and the guide seat 2, which can compensate for the small displacement of the sealing surface caused by processing errors, assembly deviations or vibrations, ensuring that the sealing ring is always in tight fit with the sealing surface.

[0034] The implementation principle of this application embodiment is as follows:

[0035] First, the sealing gasket 4 is attached to the inner wall of the annular groove 21 on the outer side of the guide seat 2, so that the inner and outer guide slopes 41 of the sealing gasket 4 correspond to the outer side of the guide seat 2 and the inner side of the oil reservoir 1, respectively. Then, the sealing ring 5 and the sealing ring 6 are placed on the guide slope 41, respectively. The annular groove 21 is used to form a circumferential positioning for the sealing gasket 4 and the sealing ring, so as to avoid radial displacement during assembly. The sealing end cap 7 is installed between the circumferential side wall of the annular groove 21 and the inner side wall of the oil reservoir 1, so that it is pressed against the sealing ring 5 and the sealing ring 6 by the sealing gasket 42. Under the compression of the sealing gasket 42, the sealing ring 5 deforms along the guide slope 41 towards the guide seat 2, and the sealing ring 6 deforms along the guide slope 41 towards the smooth surface 11 of the oil reservoir 1. The elastic deformation compensates for the small gaps caused by processing errors, assembly deviations or vibrations on the sealing surface, so as to statically seal the position of the oil reservoir 1 and the guide seat 2, and reduce the risk of oil leakage.

[0036] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel static sealing structure for hydraulic vibration dampers, characterized in that: The system includes an oil reservoir (1) and a guide seat (2). A piston rod (3) is provided in the oil reservoir (1) and the guide seat (2). A sealing gasket (4) corresponding to the inner side wall of the oil reservoir (1) is provided at the end of the guide seat (2). The sealing gasket (4) has guide slopes (41) on its inner and outer side walls. A sealing ring 1 (5) and a sealing ring 2 (6) corresponding to the outer side of the guide seat (2) and the inner side of the oil reservoir (1) are respectively provided at the position of the guide slope (41). A sealing end cap (7) is provided at the end of the oil reservoir (1).

2. The novel static sealing structure of the hydraulic vibration damper according to claim 1, characterized in that: The guide seat (2) has an annular groove (21) around the piston rod (3) on the outside. The sealing gasket (4) is in contact with the inner wall of the annular groove (21). The first sealing ring (5) abuts against the inner wall of the annular groove (21). The second sealing ring (6) abuts against the inner wall of the oil reservoir (1).

3. The novel static sealing structure of the hydraulic vibration damper according to claim 2, characterized in that: The sealing ring one (5) and sealing ring two (6) are arranged concentrically, and the cross-sections of sealing ring one (5) and sealing ring two (6) are circular.

4. The novel static sealing structure of the hydraulic vibration damper according to claim 3, characterized in that: The sealing end cap (7) is located between the circumferential side wall of the annular groove (21) and the inner side wall of the oil storage cylinder (1) and abuts against the sealing gasket (4).

5. The novel static sealing structure of the hydraulic vibration damper according to claim 4, characterized in that: The sealing end cap (7) is provided with a sealing gasket (42) on the side facing the annular groove (21) to press against the sealing ring one (5) and the sealing ring two (6).

6. The novel static sealing structure of the hydraulic vibration damper according to claim 5, characterized in that: The inner wall of the oil reservoir (1) is provided with a smooth surface (11) corresponding to the sealing gasket (4) and the second sealing ring (6). The oil reservoir (1) is provided with threaded grooves (12) on both sides of the smooth surface (11) that are threaded to the guide seat (2) and the sealing end cap (7).

7. The novel static sealing structure of the hydraulic vibration damper according to claim 6, characterized in that: The diameter of the sealing ring 1 (5) and sealing ring 2 (6) is greater than the height of the guide slope (41) of the sealing gasket (4).

8. The novel static sealing structure of the hydraulic vibration damper according to claim 7, characterized in that: The sealing ring one (5) and sealing ring two (6) are made of elastic nitrile rubber or fluororubber material. When the sealing ring one (5) and sealing ring two (6) are squeezed by the sealing gasket (42), they deform along the guide slope (41) towards the smooth surface (11) of the oil reservoir (1) and the guide seat (2).

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