Shock absorber sealing structure and nitrogen shock absorber

Abstract

The invention belongs to the technical field of shock absorbers, and discloses a shock absorber sealing structure and a nitrogen shock absorber. According to the shock absorber sealing structure, the first annular groove and the at least one second annular groove are sequentially formed in the inner wall of the guider, the first sealing piece is embedded in the first annular groove, the second sealing piece is embedded in the second annular groove, a multi-stage sealing structure is formed, oil leakage and impurity entering are effectively prevented, and the sealing performance is improved; the dustproof assembly is limited in the containing groove defined by the guider and the end cover, external dust, silt and other impurities can be prevented from making direct contact with the sealing assembly when the piston rod reciprocates, and therefore the service life of the shock absorber is prolonged. Meanwhile, when the piston rod extends out of the oil storage barrel, dust attached to the dustproof assembly can be brought out, the dust cleaning effect is achieved, the maintenance frequency and the maintenance difficulty are effectively reduced, the dustproof and sealing stability of the shock absorber sealing structure under the complex road condition and the cross-country working condition is improved, the reliability of the shock absorber sealing structure is improved, and the service life of the shock absorber sealing structure is prolonged.

Description

Technical Field

[0001] This invention relates to the field of vibration damper technology, and more particularly to vibration damper sealing structures and nitrogen vibration dampers. Background Technology

[0002] Nitrogen shock absorbers are key components in vehicle suspension systems, used to improve ride comfort and handling stability under various road conditions.

[0003] Existing nitrogen shock absorbers typically employ a detachable and maintainable structure. However, when vehicles are driven on unpaved roads or in complex off-road conditions, the dustproof and sealing structures at the limit covers of nitrogen shock absorbers need to withstand more stringent tests. Without regular maintenance, particles such as mud and sand can easily accumulate at the limit covers of the shock absorbers and further enter the shock absorber's interior, easily causing wear on the sealing structure and leading to oil leakage, which directly affects the service life and reliability of the shock absorbers.

[0004] Therefore, there is an urgent need for a vibration damper sealing structure and a nitrogen vibration damper to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a vibration damper sealing structure with a self-cleaning function, which can improve the sealing performance and dustproof performance of the vibration damper, thereby improving the reliability and service life of the vibration damper.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The vibration damper sealing structure is characterized by comprising:

[0008] An oil reservoir has an opening at one end, a guide and an end cap at the opening, the guide being confined inside the oil reservoir and sealed to the oil reservoir, and the end cap being threaded to the guide. Along the axial direction of the oil reservoir, the guide and the end cap are respectively provided with a first through hole and a second through hole.

[0009] The piston assembly includes a piston rod and a main piston valve system, the main piston valve system being slidably disposed in the oil reservoir, one end of the piston rod being connected to the main piston valve system, and the other end being slidably disposed through the first through hole and the second through hole and extending out of the oil reservoir;

[0010] A sealing assembly includes a first seal and at least one second seal. Along the direction in which the piston rod extends out of the oil reservoir, the inner wall of the first through hole is provided with a first annular groove and at least one second annular groove in sequence. The first seal is embedded in the first annular groove and seals against the piston rod. The second seal is embedded in the second annular groove and seals against the piston rod.

[0011] A dustproof component is provided, wherein the end of the guide near the opening and the end cap together form a receiving groove, the dustproof component is confined within the receiving groove, the dustproof component is used to prevent dust from contacting the sealing component, and when the piston rod extends out of the oil reservoir, the piston rod can carry the dust out from the dustproof component.

[0012] Optionally, the first seal is constructed as an annular structure, and the inner wall of the first seal is provided with a first protrusion and a pressure relief groove. The pressure relief groove is located at the end of the first protrusion away from the opening, along the direction in which the piston rod extends out of the oil reservoir, and the side of the first protrusion facing the piston rod gradually moves away from the axis of the piston rod.

[0013] Optionally, the second seal is constructed as an annular structure, and the inner wall of the second seal is provided with a second protrusion protruding inward along the radial direction of the oil reservoir. Along the direction in which the piston rod extends out of the oil reservoir, the side of the second protrusion facing the piston rod gradually moves away from the axis of the piston rod.

[0014] Optionally, the outer wall of the second seal is provided with a third protrusion protruding outward along the radial direction of the oil reservoir, and the side of the third protrusion away from the piston rod gradually approaches the axis of the piston rod along the direction in which the piston rod extends out of the oil reservoir.

[0015] Optionally, the second seal has a first groove along its circumference at one end opposite to the opening, the first groove being located between the second protrusion and the third protrusion.

[0016] Optionally, the guide has a receiving space at one end facing the opening, and the end cap has a stop portion, the stop portion and the receiving space together forming the receiving groove.

[0017] Optionally, the dustproof assembly includes a first dustproof component, which is located within the receiving groove. The first dustproof component has a first dust-blocking portion, and a dustproof patch is provided on the side of the first dust-blocking portion that abuts against the piston rod.

[0018] Optionally, the dustproof assembly further includes a second dustproof component, wherein the first dustproof component and the second dustproof component can jointly enclose a dust collection space, and the dust collection space is provided with a dust collection port facing the piston rod.

[0019] Optionally, the first dustproof component is provided with a second dust-blocking part at the dust collection port. Along the direction in which the piston rod extends out of the oil storage cylinder, the side of the second dust-blocking part that abuts against the piston rod gradually moves away from the axis of the piston rod.

[0020] The second dustproof component has a third dust-blocking part at the dust collection port. Along the direction in which the piston rod extends out of the oil storage cylinder, the side of the third dust-blocking part that abuts against the piston rod gradually approaches the axis of the piston rod.

[0021] The purpose of this invention is to provide a nitrogen vibration damper, which improves the reliability and service life of the nitrogen vibration damper by applying the above-mentioned vibration damper sealing structure.

[0022] To achieve this objective, the present invention adopts the following technical solution:

[0023] A nitrogen shock absorber includes a nitrogen cylinder assembly and the aforementioned shock absorber sealing structure, wherein the nitrogen cylinder assembly is connected to the oil reservoir of the shock absorber sealing structure.

[0024] Beneficial effects:

[0025] The shock absorber sealing structure provided by this invention, by sequentially setting a first annular groove and at least one second annular groove on the inner wall of the guide, with a first sealing element embedded in the first annular groove and a second sealing element embedded in the second annular groove, forms a multi-stage sealing structure, effectively preventing oil leakage and impurity entry, and significantly improving the overall sealing performance; the dustproof component is confined within the receiving groove surrounded by the guide and the end cover, which can prevent external dust, mud and other impurities from directly contacting the sealing component when the piston rod reciprocates, thereby extending the service life of the shock absorber; at the same time, when the piston rod extends out of the oil reservoir, it can carry away the dust attached to the dustproof component, achieving a dust cleaning effect, effectively reducing the maintenance frequency and maintenance difficulty, improving the dustproof and sealing stability of the shock absorber sealing structure under complex road conditions and off-road conditions, and improving the reliability and service life of the shock absorber sealing structure.

[0026] The nitrogen vibration damper provided by this invention, by applying the above-mentioned vibration damper sealing structure, can improve the service life of the nitrogen vibration damper, improve the sealing performance and dustproof performance of the nitrogen vibration damper under complex working conditions, and improve the overall reliability and durability of the nitrogen vibration damper. Attached Figure Description

[0027] Figure 1 This is a partial cross-sectional view of the nitrogen vibration damper provided in a specific embodiment of the present invention;

[0028] Figure 2 yes Figure 1 A magnified view of a section at point D;

[0029] Figure 3 This is a cross-sectional view of the nitrogen vibration damper provided in a specific embodiment of the present invention.

[0030] In the picture:

[0031] 100. Oil reservoir; 110. Guide; 111. First annular groove; 112. Second annular groove; 113. Receiving space; 120. End cap; 121. Stop; 130. Receiving groove; 140. Elastic retaining ring;

[0032] 200. Piston assembly; 210. Piston rod; 220. Main piston valve system;

[0033] 300. Sealing assembly; 310. First seal; 320. Second seal;

[0034] 400. Dustproof component; 410. First dustproof part; 411. First dust-blocking part; 412. Second dust-blocking part; 420. Second dustproof part; 421. Third dust-blocking part; 430. Dustproof patch; 440. Dust collection space. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0039] This embodiment provides a vibration damper sealing structure, such as Figures 1-3As shown, the shock absorber sealing structure includes an oil reservoir 100, a piston assembly 200, a sealing assembly 300, and a dustproof assembly 400. One end of the oil reservoir 100 has an opening, at which a guide 110 and an end cap 120 are provided. The guide 110 is confined within the oil reservoir 100 and is sealed to it. The end cap 120 is threadedly connected to the guide 110. Along the axial direction of the oil reservoir 100, the guide 110 and the end cap 120 respectively have a first through hole and a second through hole. The piston assembly 200 includes a piston rod 210 and a main piston valve system 220. The main piston valve system 220 is slidably disposed within the oil reservoir 100. One end of the piston rod 210 is connected to the main piston valve system 220, and the other end slidably passes through the first and second through holes, extending out of the oil reservoir 100. The sealing assembly 300... The device includes a first seal 310 and at least one second seal 320. Along the direction in which the piston rod 210 extends out of the oil reservoir 100, the inner wall of the first through hole is provided with a first annular groove 111 and at least one second annular groove 112 in sequence. The first seal 310 is embedded in the first annular groove 111 and seals against the piston rod 210. The second seal 320 is embedded in the second annular groove 112 and seals against the piston rod 210. A dustproof assembly 400 is provided. The end of the guide 110 near the opening and the end cap 120 together form a receiving groove 130. The dustproof assembly 400 is confined within the receiving groove 130. The dustproof assembly 400 is used to prevent dust from contacting the sealing assembly 300. When the piston rod 210 extends out of the oil reservoir 100, the piston rod 210 can carry the dust out from the dustproof assembly 400. The shock absorber sealing structure forms a multi-stage sealing structure by sequentially setting a first annular groove 111 and at least one second annular groove 112 on the inner wall of the guide 110. The first sealing element 310 is embedded in the first annular groove 111, and the second sealing element 320 is embedded in the second annular groove 112, effectively preventing oil leakage and impurities from entering, and significantly improving the overall sealing performance. The dustproof component 400 is confined within the receiving groove 130 surrounded by the guide 110 and the end cover 120. When the piston rod 210 reciprocates, it can prevent external dust, mud, and other impurities from directly contacting the sealing component 300, thereby extending the service life of the shock absorber. At the same time, when the piston rod 210 extends out of the oil reservoir 100, it can carry away the dust attached to the dustproof component 400, achieving a dust cleaning effect, effectively reducing the maintenance frequency and difficulty, improving the dustproof and sealing stability of the shock absorber sealing structure under complex road conditions and off-road conditions, and improving the reliability and service life of the shock absorber sealing structure.

[0040] Optionally, such as Figure 1As shown, the guide 110 is fixed inside the oil reservoir 100 by the elastic retainer 140. The guide 110 and the oil reservoir 100 are connected by a sealed connection. The end cap 120 is connected to the guide 110 by a thread. The structure is compact and easy to assemble. It not only meets the requirements for disassembly and maintenance, but also ensures that the connection between the guide 110 and the oil reservoir 100 is reliably sealed. It can adapt to harsh working conditions such as unpaved roads and complex off-road conditions, effectively prevent the performance degradation caused by mud and sand intrusion or oil leakage, and significantly improve the pollution resistance and environmental adaptability of the nitrogen shock absorber.

[0041] Optionally, the end cap 120 is provided with an internal hexagon screw that passes through the end cap 120 and is threadedly connected to the guide 110, which can prevent the guide 110 from rotating relative to the end cap 120 and further improve the stability of the guide 110.

[0042] Optionally, such as Figure 2 As shown, the first seal 310 has an annular structure. The inner wall of the first seal 310 has a first protrusion and a pressure relief groove. The pressure relief groove is located at the end of the first protrusion facing away from the opening. The pressure relief groove has a first stop surface that extends radially along the oil reservoir 100. Along the direction in which the piston rod 210 extends out of the oil reservoir 100, the side of the first protrusion facing the piston rod 210 gradually moves away from the axis of the piston rod 210. The pressure relief groove creates a pressure relief area at the first seal 310, thus relieving pressure. When the piston rod 210 extends out of the oil reservoir 100, the oil in the oil reservoir 100 contacts the first stop surface through the pressure relief area. The first stop surface effectively prevents the oil from leaking out with the piston rod 210. When the piston rod 210 retracts, the first protrusion guides the oil back into the oil reservoir 100, thus achieving oil distribution and lubrication of the piston rod 210.

[0043] Optionally, such as Figure 2 As shown, the second seal 320 has an annular structure. The inner wall of the second seal 320 has a second protrusion protruding radially inward from the oil reservoir 100. Along the direction the piston rod 210 extends out of the oil reservoir 100, the side of the second protrusion facing the piston rod 210 gradually moves away from the axis of the piston rod 210. In actual use, if a slight leak occurs at the first seal 310, the second protrusion of the second seal 320 can form a second sealing barrier, effectively blocking and guiding the leaking oil back, preventing further leakage, thus achieving multi-stage sealing protection.

[0044] Optionally, the outer wall of the second seal 320 is provided with a third protrusion protruding radially outward along the oil reservoir 100. The side of the third protrusion away from the piston rod 210 gradually approaches the axis of the piston rod 210 along the direction in which the piston rod 210 extends out of the oil reservoir 100. The third protrusion can abut against the side wall of the second annular groove 112 facing the piston rod 210. This structural design allows the second seal 320 to generate a stable radial elastic force when subjected to force, thereby ensuring that the second protrusion is always tightly fitted to the outer wall of the piston rod 210, effectively improving the sealing contact pressure and sealing reliability. At the same time, this elastic pre-tightening effect can automatically compensate for the sealing gap caused by wear or pressure changes during the compression of the shock absorber and the reciprocating motion of the piston rod 210, maintaining long-term stable sealing performance and further enhancing the anti-leakage capability and durability of the shock absorber under high-frequency vibration and complex working conditions.

[0045] Optionally, such as Figure 2 As shown, the second seal 320 has a first groove along its circumference at one end opposite to the opening, located between the second protrusion and the third protrusion. This design effectively improves the radial deformation capacity of the second seal 320, allowing the second and third protrusions to elastically deform together under stress, thereby enhancing the overall elasticity and resilience of the seal and ensuring that the seal maintains a good sealing fit during the reciprocating motion of the piston rod 210 and changes in oil pressure.

[0046] Optionally, the guide 110 has a receiving space 113 at the end facing the opening, and the end cover 120 has a stop 121. The stop 121 and the receiving space 113 together form a receiving groove 130, which can ensure the stability of the position of the dustproof component 400, thereby ensuring that the dustproof component 400 continuously and effectively blocks dust, mud and other impurities from entering the sealed area, and improving the dustproof performance and overall reliability of the shock absorber.

[0047] Optionally, such as Figure 2 As shown, the dustproof assembly 400 includes a first dustproof component 410, which is confined within the receiving groove 130. The first dustproof component 410 has a first dust-blocking part 411, and a dustproof patch 430 is provided on the side of the first dust-blocking part 411 that abuts against the piston rod 210. This effectively prevents dust, dirt, and other impurities from directly contacting the sealing assembly 300 during the reciprocating motion of the piston rod 210, thus improving the dustproof effect. Simultaneously, the dustproof patch 430 also enhances the wear resistance of the dustproof part, extending the service life of the first dustproof component 410.

[0048] In this embodiment, the dustproof patch 430 is a PTFE (Polytetrafluoroethylene) patch, which has excellent wear resistance, self-lubrication and chemical stability, effectively reducing the frictional resistance of the piston rod 210 during reciprocating motion and preventing dust particles from adhering and causing scratches and wear.

[0049] Optionally, such as Figure 2 As shown, the dustproof component 400 also includes a second dustproof component 420. The first dustproof component 410 and the second dustproof component 420 can jointly enclose a dust collection space 440. The dust collection space 440 is provided with a dust collection port facing the piston rod 210, so that dust, mud and other particulate impurities can enter the dust collection space 440 during the reciprocating motion of the piston rod 210, thereby preventing impurities from contacting the sealing component 300.

[0050] Optionally, the first dustproof component 410 has a second dust-blocking part 412 at the dust collection port, and along the direction in which the piston rod 210 extends out of the oil storage tank 100, the side of the second dust-blocking part 412 that abuts against the piston rod 210 gradually moves away from the axis of the piston rod 210; the second dustproof component 420 has a third dust-blocking part 421 at the dust collection port, and along the direction in which the piston rod 210 extends out of the oil storage tank 100, the side of the third dust-blocking part 421 that abuts against the piston rod 210 gradually moves closer to the axis of the piston rod 210. The design of the second dust-blocking part 412 and the third dust-blocking part 421 can prevent dust from further contacting the sealing component 300 when the piston rod 210 retracts into the oil reservoir 100. If the amount of dust is large, the design of the second dust-blocking part 412 and the third dust-blocking part 421 can guide dust, mud and sand impurities into the dust collection space 440. When the piston rod 210 extends out of the oil reservoir 100, the second dust-blocking part 412 and the third dust-blocking part 421 will discharge the dust and mud from the dust collection space 440, achieving a perfect dust prevention effect.

[0051] Specifically, for ease of explanation, the area before the first seal 310 and the second seal 320 of the shock absorber sealing structure is defined as area A, the entrance of the dust collection space 440 is defined as area B, and the area from the end cover 120 to the dustproof patch 430 is defined as area C. The nitrogen shock absorber is generally arranged vertically or at an angle on the vehicle during use. The piston rod 210 of the nitrogen shock absorber retracts into the oil reservoir when pressed down, and extends out of the oil reservoir when raised. The working principle of the shock absorber sealing structure is roughly as follows:

[0052] Sealing principle: When the piston rod 210 of the shock absorber is pressed down, the piston rod 210 compresses the hydraulic oil in the oil reservoir 100 through the main piston valve system 220. The hydraulic oil flows out of the oil reservoir 100 and into area A. When it passes through the unique pressure relief area formed by the pressure relief groove of the first seal 310, it forms a pressure relief effect. The first stop surface of the pressure relief groove can effectively prevent the oil from leaking out with the piston rod 210. When the first seal 310 may leak oil under different operating conditions of the vehicle, the second seal 320 can act as a second line of defense to seal. When the nitrogen shock absorber is lifted, the hydraulic oil remaining in area A will be guided back into the oil reservoir 100 by the second protrusion of the second seal 320 and the first protrusion of the first seal 310. In this process, the oil distribution lubrication function of the piston rod 210 is also achieved.

[0053] Dustproof principle: When the nitrogen shock absorber is pressed down, the dust on the outer surface of the piston rod 210 moves into the oil reservoir 100 and enters zone C along with the piston rod 210. The dust is blocked by the PTFE (polytetrafluoroethylene) patch on the head of the dustproof component 400. When a large amount of sand and dust enters zone C, the additional sand and dust will enter zone B and be blocked in the dust collection space 440 in the middle of the dustproof seal. When the nitrogen shock absorber is lifted up, it will be dragged out by the second dust blocking part 412 and the third dust blocking part 421 of the first dustproof component 410 and the second dustproof component 420, achieving a good dustproof effect.

[0054] This embodiment also provides a nitrogen vibration damper, such as Figure 3 As shown, the nitrogen shock absorber includes a nitrogen cylinder assembly and the aforementioned shock absorber sealing structure. The nitrogen cylinder assembly is connected to the oil reservoir 100 of the shock absorber sealing structure, which can form a stable buffering effect during the reciprocating motion of the piston rod 210, thereby enhancing the suspension support performance and comfort of the vehicle under complex road conditions. At the same time, by applying the aforementioned shock absorber sealing structure, oil leakage and impurity intrusion can be effectively prevented, improving the overall reliability and service life of the nitrogen shock absorber.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A vibration damper sealing structure, characterized in that, include: An oil reservoir (100) is provided with an opening at one end. A guide (110) and an end cap (120) are provided at the opening. The guide (110) is located inside the oil reservoir (100) and is sealed to the oil reservoir (100). The end cap (120) is threaded to the guide (110). Along the axial direction of the oil reservoir (100), the guide (110) and the end cap (120) are respectively provided with a first through hole and a second through hole. The piston assembly (200) includes a piston rod (210) and a main piston valve system (220). The main piston valve system (220) is slidably disposed in the oil reservoir (100). One end of the piston rod (210) is connected to the main piston valve system (220), and the other end is slidably disposed through the first through hole and the second through hole and extends out of the oil reservoir (100). A sealing assembly (300) includes a first seal (310) and at least one second seal (320) extending from the piston rod (210) into the oil reservoir (100). The inner wall of the first through hole is provided with a first annular groove (111) and at least one second annular groove (112) in sequence. The first seal (310) is embedded in the first annular groove (111) and seals against the piston rod (210). The second seal (320) is embedded in the second annular groove (112) and seals against the piston rod (210). A dustproof assembly (400) is provided, wherein the end of the guide (110) near the opening is together with the end cap (120) to form a receiving groove (130), the dustproof assembly (400) is located within the receiving groove (130), the dustproof assembly (400) is used to prevent dust from contacting the sealing assembly (300), and when the piston rod (210) extends out of the oil reservoir (100), the piston rod (210) can carry the dust out from the dustproof assembly (400).

2. The damper sealing structure according to claim 1, characterized in that, The first seal (310) is constructed as an annular structure. The inner wall of the first seal (310) is provided with a first protrusion and a pressure relief groove. The pressure relief groove is located at the end of the first protrusion away from the opening and extends from the piston rod (210) to the oil reservoir (100). The side of the first protrusion facing the piston rod (210) gradually moves away from the axis of the piston rod (210).

3. The damper sealing structure according to claim 1, characterized in that, The second seal (320) is constructed as an annular structure. The inner wall of the second seal (320) is provided with a second protrusion protruding inward along the radial direction of the oil reservoir (100). Along the direction in which the piston rod (210) extends out of the oil reservoir (100), the side of the second protrusion facing the piston rod (210) gradually moves away from the axis of the piston rod (210).

4. The damper sealing structure according to claim 3, characterized in that, The outer wall of the second seal (320) is provided with a third protrusion protruding outward along the radial direction of the oil reservoir (100). The third protrusion is located on the side away from the piston rod (210) and gradually approaches the axis of the piston rod (210) along the direction in which the piston rod (210) extends out of the oil reservoir (100).

5. The damper sealing structure according to claim 4, characterized in that, The second seal (320) has a first groove along its circumference at one end away from the opening, and the first groove is located between the second protrusion and the third protrusion.

6. The damper sealing structure according to claim 1, characterized in that, The guide (110) has a receiving space (113) at one end facing the opening, and the end cap (120) has a stop (121). The stop (121) and the receiving space (113) together form the receiving groove (130).

7. The damper sealing structure according to claim 1, characterized in that, The dustproof assembly (400) includes a first dustproof component (410), which is located in the receiving groove (130). The first dustproof component (410) is provided with a first dust-blocking part (411), and a dustproof patch (430) is provided on the side of the first dust-blocking part (411) that abuts against the piston rod (210).

8. The damper sealing structure according to claim 7, characterized in that, The dustproof assembly (400) further includes a second dustproof component (420), and the first dustproof component (410) and the second dustproof component (420) can jointly enclose a dust collection space (440), and the dust collection space (440) is provided with a dust collection port facing the piston rod (210).

9. The damper sealing structure according to claim 8, characterized in that, The first dustproof component (410) is provided with a second dust-blocking part (412) at the dust collection port. Along the direction in which the piston rod (210) extends out of the oil storage cylinder (100), the side of the second dust-blocking part (412) that abuts against the piston rod (210) gradually moves away from the axis of the piston rod (210). The second dustproof component (420) has a third dust-blocking part (421) at the dust collection port. Along the direction in which the piston rod (210) extends out of the oil storage cylinder (100), the side of the third dust-blocking part (421) that abuts against the piston rod (210) gradually approaches the axis of the piston rod (210).

10. A nitrogen vibration damper, characterized in that, It includes a nitrogen cylinder assembly and a shock absorber sealing structure according to any one of claims 1-9, wherein the nitrogen cylinder assembly is connected to the oil reservoir (100) of the shock absorber sealing structure.

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