Wear-resistant ring and shock absorber

Abstract

The utility model discloses a wear-resistant ring and a shock absorber, relates to the technical field of shock absorbers, and aims to solve the problems that paint on the outer wall of an oil storage cylinder is abraded and falls off and the service life of the oil storage cylinder is shortened due to continuous friction between a protection pipe and the oil storage cylinder of an oil pressure shock absorber. The wear-resistant ring is applied to the shock absorber, and the shock absorber comprises an oil storage cylinder, a protective cover and a protective pipe. The protection cover is axially and movably connected with the oil storage cylinder, and the first end of the protection pipe fixedly sleeves the outer side wall of the protection cover. The wear-resistant ring comprises a sleeve, and a plurality of through holes are formed in the sleeve wall of the sleeve. The sleeve is arranged on the outer side wall of the oil storage cylinder in a sleeving mode and is circumferentially fixed relative to the oil storage cylinder. The second end of the protection pipe is erected on the sleeve, and the protection pipe can move up and down relative to the sleeve under the action of external force so as to controllably cover the through hole.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration dampers, in particular to a wear-resistant ring and a vibration damper. Background Art

[0002] Hydraulic shock absorbers are key components on rail vehicles. With the rapid development of high-speed rail technology in my country in recent years, rail vehicle speeds have continued to increase, placing increasingly stringent demands on these components. In existing technology, protective tubes are installed around hydraulic shock absorbers to minimize damage from foreign matter.

[0003] However, in actual use, the protective tube will continuously rub against the oil reservoir of the oil reservoir as the oil reservoir expands or contracts, causing the paint on the outer wall of the oil reservoir to wear and fall off, thus reducing the service life of the oil reservoir. Utility Model Content

[0004] The purpose of the utility model is to provide a wear-resistant ring and a vibration damper, which are used to reduce or avoid the wear of the protective tube on the oil storage cylinder, so as to increase the service life of the oil storage cylinder.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present invention provides a wear-resistant ring for use in a shock absorber. The shock absorber comprises an oil storage cylinder, a protective cover and a protective tube. The protective cover is axially movably connected to the oil storage cylinder, and the first end of the protective tube is fixedly sleeved on the outer wall of the protective cover. The wear-resistant ring comprises: a sleeve, and a plurality of through holes are provided on the wall of the sleeve. The sleeve is sleeved on the outer wall of the oil storage cylinder, and the sleeve is circumferentially fixed relative to the oil storage cylinder. The second end of the protective tube is mounted on the sleeve, and the protective tube can move up and down relative to the sleeve under the action of external force to controllably cover the through holes.

[0006] Compared to the prior art, the wear-resistant ring provided by the present invention features a sleeve that is mounted on the outer wall of the oil reservoir and is circumferentially fixed relative to the oil reservoir. Furthermore, the second end of the protective tube rests on the sleeve. As can be seen from the above, the presence of the wear-resistant ring prevents direct contact between the protective tube and the oil reservoir, effectively preventing direct contact between the protective tube and the oil reservoir. Therefore, during operation of the shock absorber, as the protective tube moves toward or away from the oil reservoir, friction between the protective tube and the oil reservoir is avoided, thereby preventing wear and tear on the oil reservoir. This eliminates the possibility of paint on the outer wall of the oil reservoir being worn off due to friction, thereby increasing the service life of the oil reservoir and, consequently, the shock absorber. This also ensures the aesthetic appearance of the oil reservoir, thereby ensuring the aesthetic appearance of the shock absorber. Furthermore, because the sleeve has multiple through-holes, compared to sleeves without through-holes, not only is its weight reduced, but it also saves material, reducing its material cost. Furthermore, because the protective tube can move up and down relative to the sleeve under external force to controllably cover the through-hole, the through-holes in the sleeve can replace the original through-holes in the sidewall of the protective tube. Air inhaled and exhaled during shock absorber operation can enter or exit through these through-holes, enabling air exchange between the shock absorber and its exterior, ensuring proper operation. This also reduces or prevents condensation in spring and autumn, or rainwater that seeps through the original through-holes in the protective tube's sidewall and accumulates between the protective tube and the oil reservoir. This allows dew or rainwater to drain through the through-holes, reducing or eliminating the risk of rust on the oil reservoir, further extending the service life of the oil reservoir and, consequently, the shock absorber.

[0007] In one implementation, the sleeve is a sleeve made of plastic material.

[0008] In one implementation, the cross-sectional shape of the through hole includes one or more of a closed figure formed by an arc and a line segment, a triangle, or a rectangle.

[0009] In one implementation, the cross-sectional shape of the through hole includes one or more of an equilateral triangle, an isosceles triangle, or a right triangle.

[0010] In one implementation, the wall of the sleeve includes a plurality of through-hole units distributed in an array; each of the through-hole units includes a plurality of through-holes distributed at intervals, and the plurality of through-holes are distributed along the circumferential direction.

[0011] In one implementation, each of the through-hole units includes eight through-holes that are spaced apart, and the eight through-holes are distributed circumferentially; wherein, along the height direction of the sleeve, the through-hole closest to the protective cover is the first through-hole, the through-hole farthest from the protective cover is the second through-hole, the through-hole located on the side of the first through-hole is the third through-hole, and the through-hole located on the side of the second through-hole is the fourth through-hole;

[0012] Along the direction away from the protective cover, the orifice areas of the two first through holes gradually decrease, the orifice areas of the two second through holes gradually increase, the orifice areas of the two third through holes gradually increase, and the orifice areas of the two fourth through holes gradually decrease.

[0013] In one implementation, along the height direction of the sleeve, at least one vertex in the cross-section of the third through hole is not on the same straight line as any edge in the cross-section of the first through hole; and / or, along the height direction of the sleeve, at least one vertex in the cross-section of the fourth through hole is not on the same straight line as any edge in the cross-section of the second through hole.

[0014] In one implementation, the cross-sectional shape of the through hole is a right triangle.

[0015] In one implementation, a mounting opening is provided on the side wall of the sleeve along the height direction of the sleeve; and the sleeve is sleeved on the outer side wall of the oil storage cylinder through the mounting opening.

[0016] In a second aspect, the present invention also provides a shock absorber. The shock absorber includes an oil storage cylinder, a protective cover, a protective tube, and the wear-resistant ring of the above-mentioned technical solution. At least a portion of the oil storage cylinder is sleeved within the protective cover, and the protective cover is axially movably connected to the oil storage cylinder. The first end of the protective tube is fixedly sleeved on the outer wall of the protective cover. The wear-resistant ring includes a sleeve, and a plurality of through holes are formed on the sleeve wall. The sleeve is sleeved on the outer wall of the oil storage cylinder and is circumferentially fixed relative to the oil storage cylinder. The second end of the protective tube is mounted on the sleeve, and the protective tube can move up and down relative to the sleeve under the action of an external force to controllably cover the through holes.

[0017] Compared with the prior art, the beneficial effects of the shock absorber provided by the present invention are the same as the beneficial effects of the wear-resistant ring described in the above technical solution, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1This is a structural diagram of the shock absorber in the first working state according to the embodiment of the utility model;

[0020] Figure 2 This is a structural diagram of the shock absorber in the second working state according to the embodiment of the present utility model;

[0021] Figure 3 This is a top view of the wear-resistant ring in the embodiment of the utility model;

[0022] Figure 4 This is a DD sectional view of the wear-resistant ring in the embodiment of the utility model;

[0023] Figure 5 In the embodiment of the present utility model Figure 4 A magnified schematic diagram of some structures in .

[0024] Reference numerals:

[0025] 1- oil storage cylinder, 2- protective cover, 3- protective tube, 4- wear-resistant ring, 40- sleeve, 41- through hole unit, 42- first through hole, 43- second through hole, 44- third through hole, 45- fourth through hole, 46- installation opening. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0029] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] In order to solve the above technical problems, in the first aspect, the embodiment of the present utility model provides a wear-resistant ring for use in a shock absorber. Figures 1 to 4 The shock absorber includes an oil reservoir 1, a protective cover 2, and a protective tube 3. The protective cover 2 is axially movable in connection with the oil reservoir 1, and the first end of the protective tube 3 is fixedly mounted on the outer wall of the protective cover 2. For example, the protective cover 2 is mounted on a portion of the outer wall of the oil reservoir 1 and is axially movable in connection with the oil reservoir 1. The specific structures of the oil reservoir 1, protective cover 2, and protective tube 3 are not specifically limited herein.

[0032] See also Figures 1 to 4 , the above-mentioned wear-resistant ring 4 includes: a sleeve 40, and a plurality of through holes are opened on the wall of the sleeve 40. The sleeve 40 is sleeved on the outer wall of the oil storage cylinder 1, and the sleeve 40 is fixed circumferentially relative to the oil storage cylinder 1. The second end of the protective tube 3 is mounted on the sleeve 40, and the protective tube 3 can move up and down relative to the sleeve 40 under the action of external force to cover the through holes in a controllable manner. It should be noted that the above-mentioned external force can come from the oil storage cylinder or from other devices, such as manual drive. The above-mentioned "covering the through holes in a controllable manner" can be understood as when the shock absorber is in a stretched state, the protective tube gradually exposes the through holes so that the through holes are connected to the outside world. When the shock absorber is in a compressed state, the protective tube gradually covers the through holes.

[0033] See also Figures 1 to 4In the wear-resistant ring provided in the embodiment of the present invention, the sleeve 40 is sleeved on the outer wall of the oil storage cylinder 1, and the sleeve 40 is circumferentially fixed relative to the oil storage cylinder 1. Furthermore, the second end of the protective tube 3 is placed on the sleeve 40. As can be seen from the above, due to the presence of the wear-resistant ring 4, the direct contact between the protective tube 3 and the oil storage cylinder 1 is isolated, that is, the protective tube 3 and the oil storage cylinder 1 are not in direct contact. Therefore, when the shock absorber is working, in the process of the protective tube 3 moving in the direction of approaching or away from the oil storage cylinder 1, friction between the protective tube 3 and the oil storage cylinder 1 can be avoided, so as to avoid the wear of the oil storage cylinder 1 by the protective tube 3, thereby eliminating the probability of the paint on the outer wall of the oil storage cylinder 1 being worn off due to friction, thereby increasing the service life of the oil storage cylinder 1, and thus increasing the service life of the shock absorber. At the same time, it can also ensure the aesthetic appearance of the oil storage cylinder 1, so as to ensure the aesthetic appearance of the shock absorber. Furthermore, because the sleeve 40 has multiple through-holes formed in its wall, the sleeve 40 not only reduces its weight compared to a sleeve 40 without through-holes, but also saves material for its production, reducing its material cost. Furthermore, because the protective tube 3 can move up and down relative to the sleeve 40 under the action of an external force, controlling the coverage of the through-holes, the through-holes formed in the sleeve 40 can replace the through-holes originally formed in the sidewall of the protective tube 3. During operation of the shock absorber, air inhaled and exhaled can enter or exit through these through-holes, enabling air exchange between the shock absorber and its exterior, ensuring proper operation. This also reduces or prevents condensation in spring and autumn, or rainwater that infiltrates through the original through-holes formed in the sidewall of the protective tube 3 and accumulates between the protective tube 3 and the oil reservoir 1. This allows dew or rainwater to drain through the through-holes, reducing or eliminating the possibility of corrosion of the oil reservoir 1 by dew or rainwater, further extending the service life of the oil reservoir 1 and, consequently, the shock absorber.

[0034] The thickness and length of the sleeve can be adjusted based on practical needs. In the embodiment of the present invention, the sleeve is very thin. Furthermore, the specific position of the sleeve relative to the oil reservoir can also be adjusted based on practical needs, as long as the second end of the protective tube rests on the sleeve when the protective tube is in its longest or initial state.

[0035] As one possible implementation, the sleeve is made of a plastic material. The plastic material used has a self-lubricating effect, so the sleeve made of the plastic material has a lubricating effect. In actual use, the friction between the protective tube and the wear-resistant ring can be reduced, thereby extending the service life of the protective tube and the wear-resistant ring.

[0036] The shapes of the through holes are varied. For example, the cross-sectional shape of the through hole includes one or more of a closed figure consisting of an arc and a line segment, a triangle or a rectangle. Exemplarily, the cross-sectional shape of the through hole can be only a triangle, or only a rectangle, or only a closed figure consisting of an arc and a line segment (such as a fan), or a combination of at least two of the above three shapes. When the cross-sectional shape of the through hole is a triangle, the cross-sectional shape of the through hole includes one or more of an equilateral triangle, an isosceles triangle or a right triangle. In an embodiment of the present invention, the cross-sectional shape of the through hole is a right triangle.

[0037] There are many ways to distribute the above-mentioned through holes. As a possible implementation method, see Figure 4 The sleeve 40 includes a plurality of through-hole units 41 distributed in an array on its wall. Each through-hole unit 41 includes a plurality of through-holes distributed at intervals, and the plurality of through-holes are distributed along the circumferential direction.

[0038] In an alternative approach, see Figure 4 Each through-hole unit 41 includes eight spaced-apart through-holes distributed circumferentially. In a through-hole unit 41, along the height direction H of the sleeve 40, the through-hole closest to the protective cover 2 is the first through-hole 42, the through-hole farthest from the protective cover 2 is the second through-hole 43, the through-hole flanking the first through-hole 42 is the third through-hole 44, and the through-hole flanking the second through-hole 43 is the fourth through-hole 45. As one moves away from the protective cover 2, the opening areas of the two first through-holes 42 gradually decrease, the opening areas of the two second through-holes 43 gradually increase, the opening areas of the two third through-holes 44 gradually increase, and the opening areas of the two fourth through-holes 45 gradually decrease.

[0039] In an alternative approach, see Figure 4 and Figure 5 Along the height direction H of the sleeve 40, at least one vertex in the cross section of the third through hole 44 is not co-linear with any edge in the cross section of the first through hole 42. And / or, along the height direction H of the sleeve 40, at least one vertex in the cross section of the fourth through hole 45 is not co-linear with any edge in the cross section of the second through hole 43.

[0040] For example, see Figure 4 and Figure 5 Along the height direction H of the sleeve 40, the cross section of the third through hole 44 includes the vertex M closest to the protective cover, and the cross section of the first through hole 42 includes the edge L1 closest to the protective cover. The vertex M and edge L1 are not co-linear. Along the height direction H of the sleeve 40, the cross section of the fourth through hole 45 includes the vertex N farthest from the protective cover, and the cross section of the second through hole 43 includes the edge L2 farthest from the protective cover. The vertex N and edge L2 are not co-linear.

[0041] In an alternative approach, see Figure 4 , the cross-sectional shape of the through hole is a right triangle.

[0042] When the above technical solution is adopted, see Figure 1 and Figure 4 , when the shock absorber is in tension ( Figure 1 (The arrows in the figure indicate the direction of air flow, with air being drawn into the shock absorber.) As the second end of the protective tube 3 moves upward relative to the wear-resistant ring, the second through-hole 43 is first exposed, followed by the gradual exposure of the fourth through-hole 45. Once the fourth through-hole 45 is fully exposed, the third through-hole 44 is gradually exposed, followed by the gradual exposure of the first through-hole 42. During the exposure of the second through-hole 43, the initially exposed second through-hole 43 has the largest opening area. This large exposed area absorbs more gas from the outside, resulting in a low air flow rate. Consequently, the shock absorber's intake process is slow, minimizing the intake of impurities.

[0043] See also Figure 2 and Figure 4 , when the shock absorber is in compression ( Figure 2 The arrows in the figure indicate the direction of air flow, with air being discharged from the shock absorber. As the second end of the protective tube 3 moves downward relative to the wear-resistant ring, it first moves to the position with the largest opening area of ​​the first through-hole 42. At this point, more air is discharged from the position with the smallest opening area of ​​the first through-hole 42, where the flow rate is fastest. This allows for the removal of as much impurities from the oil reservoir 1 as possible.

[0044] In summary, the above technical solution not only enables air exchange between the inside and outside of the shock absorber, but also reduces the ingress of impurities into the shock absorber, ensuring proper function and extending its service life. Furthermore, if dew or rainwater enters the space between the protective tube and the oil reservoir, it can be drained through the above-mentioned through-holes, further reducing or eliminating the risk of dew or rainwater corroding the oil reservoir, thereby extending the service life of the oil reservoir and, consequently, the shock absorber.

[0045] In the embodiment of the present utility model, see Figure 4In each through-hole unit 41, eight through-holes with a right-angled triangle cross-section are distributed in a cross-section in the shape of a cross. There is a third through-hole 44 on one side of each first through-hole 42, and there is a fourth through-hole 45 on one side of each second through-hole 43. The right-angled sides in the cross-sections of the two first through-holes 42 are opposite to each other, and the right-angled sides in the cross-sections of the two second through-holes 43 are opposite to each other. The hypotenuse in the cross-section of the third through-hole 44 is opposite to the hypotenuse in the cross-section of the first through-hole 42, and the hypotenuse in the cross-section of the fourth through-hole 45 is opposite to the hypotenuse in the cross-section of the second through-hole 43. Furthermore, along the height direction H of the sleeve 40, the cross-section of the third through-hole 44 includes the vertex M closest to the protective cover, and the cross-section of the first through-hole 42 includes the edge L1 closest to the protective cover, and the vertex M and the edge L1 are not on the same straight line. Along the height direction H of the sleeve 40 , the cross section of the fourth through hole 45 includes the vertex N farthest from the protective cover, and the cross section of the second through hole 43 includes the edge L2 farthest from the protective cover. The vertex N and the edge L2 are not on the same straight line.

[0046] As a possible implementation, see Figure 3 and Figure 4 Along the height direction of the sleeve 40 , a mounting opening 46 is opened on the side wall of the sleeve 40 , and the sleeve 40 is sleeved on the outer side wall of the oil storage cylinder 1 through the mounting opening 46 .

[0047] After the shock absorber is assembled with other equipment, the sleeve 40 can be mounted on the outer wall of the oil storage cylinder 1 through the mounting opening 46 without excessively disassembling the shock absorber or without disassembling the shock absorber, so as to reduce the difficulty of installation and save installation time.

[0048] When the shock absorber is not assembled with other equipment, it can be directly sleeved on the outer wall of the oil storage cylinder through the mounting hole of the sleeve itself (i.e., the through hole running through the sleeve interior). Of course, it can also be sleeved on the outer wall of the oil storage cylinder through the mounting opening of the sleeve.

[0049] In addition, the above-mentioned installation opening can also be used to drain dew or rainwater, reducing or eliminating the probability of dew or rainwater corroding the oil storage cylinder, increasing the service life of the oil storage cylinder, and thus increasing the service life of the shock absorber.

[0050] As a possible implementation method, the wear-resistant ring is manufactured by a blow molding process, which has good consistency and high output.

[0051] In the second aspect, the embodiment of the present invention further provides a shock absorber. Figures 1 to 4The shock absorber includes an oil storage cylinder 1, a protective cover 2, a protective tube 3 and a wear-resistant ring 4 of the above technical solution. At least a portion of the oil storage cylinder 1 is sleeved in the protective cover 2, and the protective cover 2 is axially movably connected to the oil storage cylinder 1. One end of the protective tube 3 is fixedly sleeved on the outer wall of the protective cover 2. The wear-resistant ring 4 includes a sleeve 40, and a plurality of through holes are opened on the wall of the sleeve 40. The sleeve 40 is sleeved on the outer wall of the oil storage cylinder 1, and the sleeve 40 is circumferentially fixed relative to the oil storage cylinder 1. The second end of the protective tube 3 is mounted on the sleeve 40, and the protective tube 3 can move up and down relative to the sleeve 40 under the action of external force to cover the through holes in a controllable manner.

[0052] The beneficial effects of the vibration damper provided by the embodiment of the present utility model are the same as the beneficial effects of the wear-resistant ring described in the above technical solution, and will not be described in detail here.

[0053] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A wear-resistant ring used in a shock absorber; the shock absorber comprises an oil storage cylinder, a protective cover and a protective tube; the protective cover is axially movably connected to the oil storage cylinder; the first end of the protective tube is fixedly sleeved on the outer wall of the protective cover; characterized in that: The wear-resistant ring comprises: A sleeve, wherein a plurality of through holes are formed on the wall of the sleeve; The sleeve is sleeved on the outer wall of the oil storage cylinder and is circumferentially fixed relative to the oil storage cylinder; the second end of the protective tube is placed on the sleeve; the protective tube can move up and down relative to the sleeve under the action of external force to controllably cover the through hole.

2. The wear-resistant ring according to claim 1, characterized in that: The sleeve is made of plastic material.

3. The wear-resistant ring according to claim 1, characterized in that: The cross-sectional shape of the through hole includes one or more of a closed figure formed by an arc and a line segment, a triangle or a rectangle.

4. The wear-resistant ring according to claim 1 or 2, characterized in that: The cross-sectional shape of the through hole includes one or more of an equilateral triangle, an isosceles triangle or a right triangle.

5. The wear-resistant ring according to claim 4, characterized in that: The wall of the sleeve includes a plurality of through-hole units distributed in an array; each of the through-hole units includes a plurality of through-holes distributed at intervals, and the plurality of through-holes are distributed along the circumferential direction.

6. The wear-resistant ring according to claim 5, characterized in that: Each of the through-hole units includes eight through-holes distributed at intervals, and the eight through-holes are distributed along the circumferential direction; wherein, along the height direction of the sleeve, the through-hole closest to the protective cover is the first through-hole, the through-hole farthest from the protective cover is the second through-hole, the through-hole located on the side of the first through-hole is the third through-hole, and the through-hole located on the side of the second through-hole is the fourth through-hole; Along the direction away from the protective cover, the orifice areas of the two first through holes gradually decrease, the orifice areas of the two second through holes gradually increase, the orifice areas of the two third through holes gradually increase, and the orifice areas of the two fourth through holes gradually decrease.

7. The wear-resistant ring according to claim 6, characterized in that: Along the height direction of the sleeve, at least one vertex in the cross-section of the third through hole is not on the same straight line as any edge in the cross-section of the first through hole; and / or, along the height direction of the sleeve, at least one vertex in the cross-section of the fourth through hole is not on the same straight line as any edge in the cross-section of the second through hole.

8. The wear-resistant ring according to claim 6, characterized in that: The cross-sectional shape of the through hole is a right triangle.

9. The wear-resistant ring according to claim 1, characterized in that: Along the height direction of the sleeve, a mounting opening is opened on the side wall of the sleeve; the sleeve is sleeved on the outer side wall of the oil storage cylinder through the mounting opening.

10. A shock absorber, characterized in that: include: Oil storage tank; a protective cover, wherein at least a portion of the oil storage cylinder is sleeved within the protective cover, and the protective cover is axially movably connected to the oil storage cylinder; A protective tube, a first end of which is fixedly sleeved on the outer side wall of the protective cover; The wear-resistant ring according to any one of claims 1 to 9; the wear-resistant ring comprising: A sleeve, wherein a plurality of through holes are formed on the wall of the sleeve; the sleeve is sleeved on the outer wall of the oil storage cylinder, and the sleeve is circumferentially fixed relative to the oil storage cylinder; the second end of the protective tube is placed on the sleeve; the protective tube can move up and down relative to the sleeve under the action of external force to controllably cover the through holes.

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