CN211501452U - Oil seal structure, shock absorber, suspension system and vehicle - Google Patents

Abstract

The present disclosure relates to an oil seal structure, a shock absorber, a suspension system and a vehicle, wherein the oil seal structure is provided between an end of a cylinder (3) storing oil and a piston rod (2), one end of the piston rod (2) is provided in the cylinder (3) and is capable of reciprocating with respect to extension and retraction of the cylinder (3), the oil seal structure includes a plurality of stages of oil scraper rings (112), the plurality of stages of oil scraper rings (112) are arranged at intervals in an axial direction, and the plurality of stages of oil scraper rings (112) are provided with increasing tolerance of fit with the piston rod (2) in a retraction direction of the piston rod (2). Through above-mentioned technical scheme, the oil blanket structure that this disclosure provided can reduce and even avoid fluid along with the reciprocating motion exosmosis of piston rod.

Description

Oil seal structure, shock absorber, suspension system and vehicle

Technical Field

The disclosure relates to the technical field of sealing elements, in particular to an oil seal structure, a shock absorber, a suspension system and a vehicle.

Background

The shock absorber is an important component of a suspension system of a vehicle and can play a role in buffering and damping shock.

In the working process of the shock absorber, lubricating oil in the shock absorber can seep outwards along with the reciprocating motion of the piston rod, so that the shock absorption effect of the shock absorber can be reduced, abnormal sound is generated when a vehicle runs to a bumpy road surface, a suspension system of the vehicle is damaged, the balance performance of the vehicle is affected due to uneven stress of wheels on two sides, and certain potential safety hazards are realized.

The key part influencing the oil leakage of the shock absorber is an oil seal, an oil seal sleeve is arranged on a piston rod and seals an oil storage cylinder to prevent oil from seeping out along with the piston rod, and the oil seal with good sealing performance has a decisive role in preventing the oil leakage of the shock absorber.

SUMMERY OF THE UTILITY MODEL

The purpose of this disclosure is to provide an oil seal structure, this oil seal structure can reduce or even avoid fluid along with the reciprocating motion exosmosis of piston rod.

Another object of the present disclosure is to provide a shock absorber, which includes the oil seal structure provided by the present disclosure, and can reduce or even avoid the oil leakage, maintain good shock absorption, and prolong the service life.

It is a further object of the present disclosure to provide a suspension system including the shock absorber of the present disclosure that reduces or even avoids oil leakage, maintains good shock absorption and balance, and increases service life.

It is a further object of the present disclosure to provide a vehicle including a suspension system provided by the present disclosure with improved safety.

In order to achieve the above object, the present disclosure provides an oil seal structure provided between an end of a cylinder block storing oil and a piston rod having one end provided in the cylinder block and capable of reciprocating in extension and retraction with respect to the cylinder block, the oil seal structure including a plurality of stages of oil scraper rings arranged at intervals in an axial direction and provided with fitting tolerances with the piston rod increasing progressively in a retraction direction of the piston rod.

Alternatively, the oil seal structure includes a body configured with a shaft hole through which the piston rod passes, the multistage oil scraper rings being provided on a hole wall of the shaft hole, and a hole diameter of the shaft hole between adjacent two of the oil scraper rings increases in the retracting direction.

Alternatively, the oil scraper ring is configured as an annular projection radially inward from a bore wall of the shaft hole.

Optionally, the oil seal structure includes a housing, the housing is formed with the first through hole for avoiding the piston rod, the body is disposed in the first through hole and is fixedly connected to the housing, an accommodating groove is disposed on a hole wall of the first through hole, and the body is fixed in the accommodating groove.

Optionally, a radially inward connecting protrusion is formed on the bottom wall of the accommodating groove, and a groove matched with the connecting protrusion is formed on the outer surface of the body.

According to another aspect of the present disclosure, there is provided a shock absorber including a cylinder, a piston rod, and the above oil seal structure.

Optionally, the oil seal structure is disposed in the cylinder block and located at an end portion of the cylinder block, and a receiving table is formed on an inner wall of the end portion of the cylinder block to support the oil seal structure.

Optionally, the damper includes a cover, the cover includes a cover plate, a sealing edge, and a stop boss, the sealing edge is disposed around a circumferential edge of the cover plate to connect with an end portion of the cylinder block, and the stop boss is disposed on an inner surface of the cover plate to cooperate with the receiving table to limit movement of the oil seal structure relative to the cylinder block in an axial direction of the cylinder block.

According to yet another aspect of the present disclosure, a suspension system is provided that includes the shock absorber described above.

According to yet another aspect of the present disclosure, a vehicle is provided that includes the suspension system described above.

Through the technical scheme, when the shock absorber using the oil seal structure provided by the disclosure works, when the piston rod extends out of the cylinder body, oil attached to the piston rod firstly passes through the first-stage oil scraper ring, part of the oil attached to the piston rod is scraped, and the residual oil on the piston rod reaches the second-stage oil scraper ring along with the extending movement of the piston rod. The shock absorber comprising the oil seal structure can reduce or even avoid the externally leaked oil, keep good shock absorption and prolong the service life. The suspension system can reduce or even avoid the external leakage of oil, maintain good vibration reduction and balance and prolong the service life. The vehicle can have better safety.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a perspective view of an oil seal arrangement provided in accordance with an embodiment of the present disclosure;

FIG. 2 is a top view of an oil seal arrangement provided in accordance with an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view taken along line C-C of FIG. 2;

FIG. 4 is a schematic perspective view of a shock absorber provided in accordance with an embodiment of the present disclosure;

FIG. 5 is an exploded view of the shock absorber shown in FIG. 4;

FIG. 6 is a cross-sectional view of a shock absorber provided in accordance with an embodiment of the present disclosure;

FIG. 7 is an enlarged view of portion A of FIG. 6;

FIG. 8 is a schematic perspective view of a closure provided in accordance with an embodiment of the present disclosure;

fig. 9 is a perspective schematic view of a cylinder provided according to an embodiment of the present disclosure.

Description of the reference numerals

1 oil seal structure 2 piston rod 3 cylinder

4 cover 11 body 12 shell

111 shaft hole 112 oil scraper ring 121 first through hole

122 accommodating groove 123 connecting boss 31 receiving table

41 cover plate 42 edge sealing 43 stopping boss

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the terms of orientation such as "front and rear" are used to define based on the direction of oil seepage, wherein the oil flows from front to rear when seeping out, and the oil seeps out as the piston rod flows from front to rear when the piston rod extends from the cylinder, that is, the extending direction of the piston rod is consistent with the front to rear direction, and the retracting direction of the piston rod is consistent with the rear to front direction, as specifically shown in the figures; "inner and outer" are inner and outer with respect to the profile of the corresponding component itself, for example for a shock absorber, the side of the cover facing the cylinder is the inner surface; the "longitudinal direction" is defined based on the shock absorber, which is parallel to the axial direction of the shock absorber. Furthermore, the terms "first," "second," and the like, as used herein are intended to distinguish one element from another, and are not necessarily sequential or significant. In the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements, unless otherwise explained. The foregoing definitions are provided to illustrate and describe the present disclosure only and should not be construed to limit the present disclosure otherwise.

According to an embodiment of the present disclosure, an oil seal structure is provided, one example of which is shown in fig. 1 to 4. Figures 4-7 illustrate one embodiment of a shock absorber provided in accordance with the present disclosure. Referring to fig. 4 to 7, the oil seal structure 1 may be disposed between a cylinder 3 storing oil and a piston rod 2, and one end of the piston rod 2 may be disposed in the cylinder 3 and may be capable of reciprocating movement of extending and retracting with respect to the cylinder 3. Referring to fig. 3 and 7, the oil seal structure 1 may include a plurality of stages of oil scraper rings 112, and the plurality of stages of oil scraper rings 112 may be arranged at intervals in the axial direction, and the plurality of stages of oil scraper rings 112 are arranged with increasing tolerance of fit with the piston rod 2 in the retracting direction of the piston rod 2. The axial direction here refers to the axial direction of the piston rod 2. For convenience of description, the first-stage scraper ring, the second-stage scraper ring, and so on are defined as the largest fitting tolerance among the multi-stage scraper rings 112.

Through the technical scheme, when the shock absorber using the oil seal structure provided by the disclosure works, when the piston rod 2 extends out of the cylinder body 3, oil attached to the piston rod 2 firstly passes through the first-stage oil scraper ring, here, the oil attached to the piston rod 2 is partially scraped, and the residual oil on the piston rod 2 reaches the second-stage oil scraper ring along with the extending movement of the piston rod 2, because the matching tolerance between the second-stage oil scraper ring and the piston rod 2 is smaller than that between the first-stage oil scraper ring and the piston rod 2, the second-stage oil scraper ring can further scrape the residual oil, so that the oil leakage of the oil carried by the piston rod 2 in the extending movement can be reduced or even avoided as far as possible through the scraping of the multi-stage oil scraper rings, so that the oil leakage of the oil can be effectively reduced or even avoided.

Specifically, as shown in fig. 1 to 5, the oil scraper ring 112 may be configured in a ring shape, which is sleeved on the piston rod 2 and attached to the piston rod 2, and when the piston rod 2 extends outward from the cylinder 3 storing oil, the oil attached to the piston rod 2 may be scraped off, so as to prevent the oil from leaking out of the cylinder 3 along with the extension of the piston rod 2. The oil scraper ring 112 may be made of rubber or other soft materials resistant to wear and oil corrosion, and the piston rod 2 and the oil scraper ring 112 may be in interference fit, so that the oil scraper ring 112 and the piston rod 2 can be tightly attached to wipe off oil. There may be a plurality of stages of oil scraper rings 112 along the axial direction of the piston rod 2, and in the direction in which the piston rod 2 is retracted into the cylinder 3 (in correspondence with the direction from the rear to the front), the fitting tolerance between each stage of oil scraper rings 112 and the piston rod 2 may be increased, that is, in the extending direction of the piston rod 2 (in correspondence with the direction from the front to the rear), the fitting between the oil scraper rings 112 and the piston rod 2 is getting tighter and tighter, and the ability to wipe the piston rod 2 clean is getting stronger. The specific number of the oil scraper rings 112 may be two or more, and each oil scraper ring 112 may have one or more identical oil scraper rings 112, so as to wipe the piston rod 2 clean, which is not limited herein; for example, as shown in fig. 3, the oil seal structure 1 has three oil scraper rings 112 in common, and there is only one oil scraper ring per stage. It should be noted that the tolerance of the interference fit between the oil scraper ring 112 and the piston rod 2 and the hardness of the material of the oil scraper ring 112 are selected to avoid the friction force between the oil scraper ring 112 and the piston rod 2 from being too large to affect the reciprocating motion of the piston rod 2. In addition, the oil here may be lubricating oil, or hydraulic oil, or other types of oil.

According to some embodiments of the present disclosure, as shown in fig. 1 to 3, the oil seal structure 1 may include a body 11, the body 11 may be configured with a shaft hole 111 through which the piston rod 2 passes, and multiple stages of oil scrapers 112 may be disposed on the wall of the shaft hole 111, and the diameter of the shaft hole 111 between two adjacent oil scrapers 112 increases in the retraction direction of the piston rod 2. Specifically, for the purpose of description, only one oil scraper ring is set here, the piston rod 2 passes through the shaft hole 111 of the body 11, and is attached to the multiple oil scraper rings 112 arranged on the wall of the shaft hole 111, so as to scrape off the attached oil step by step, the space between two adjacent oil scraper rings 112 will contain the oil, accordingly, the oil scraped by the first oil scraper ring which scrapes the oil first can be scraped most, the oil scraped by the following oil scraper rings 112 can be gradually reduced, and the oil scraped by the first oil scraper ring can be returned to the cylinder 3; further, since the oil is scraped off by the oil scraper ring 112 during the extending movement of the piston rod 2, the scraped-off oil can move in the forward direction from the rear and the outward direction in the radial direction at the same time, and is accommodated in the accommodation space in front of the oil scraper ring 112, and there is a possibility that the scraped-off oil may strike the bore wall of the shaft hole 111 corresponding to the accommodation space, where the accommodation space in front of the oil scraper ring 112 includes two types, the first type is a space surrounded by the front side of the first oil scraper ring, the bore wall of the shaft hole 111 or the inner sidewall of the cylinder 3, and the sidewall of the piston rod 2 when the oil scraper ring 112 is the first oil scraper ring, and the second type is a space surrounded by the front side of the oil scraper ring 112, the bore wall of the shaft hole 111, and the sidewall of the piston rod 2 when the oil scraper ring 112 is the third oil scraper ring behind the first oil scraper ring, such as the second oil scraper ring, the third oil scraper ring, and, A space surrounded by the side wall of the piston rod 2 and the rear side of the first-stage oil scraper ring adjacent to and in front of the first-stage oil scraper ring 112; therefore, the aperture of the shaft hole 111 between two adjacent oil scraper rings 112 is increased gradually along the retraction direction of the piston rod 2, and the oil liquid accommodating space between two adjacent oil scraper rings 112 can be gradually increased in the retraction direction, so that the scraped oil liquid can simultaneously move along the backward and forward direction and the radial outward direction to impact the path of the hole wall of the shaft hole 111, and the impact force is reduced, thereby reducing or avoiding the oil liquid splashing around in the accommodating space, which affects the oil scraping effect, moreover, when the piston rod 2 extends, the first-stage oil scraper ring which scrapes the oil liquid first can scrape the largest amount of the oil liquid, the corresponding accommodating space is the largest, the second-stage oil scraper ring can scrape the second amount of the oil liquid, the corresponding size of the accommodating space is the second, and so on, as the scraped oil liquid is less and less, the corresponding accommodating space is smaller, the oil liquid can not generate pressure to the oil scraper rings 112 at both sides because of the accommodating space is insufficient, the fitting tolerance between the oil scraper ring 112 and the piston rod 2 is affected, and the oil scraping effect is affected.

Because the oil scraped by the first-stage oil scraper ring positioned at the forefront is the most, the first-stage oil scraper ring can be positioned in the shaft hole 111, and a section of shaft hole is arranged in front of the first-stage oil scraper ring, so that the section of shaft hole can be formed into a conical hole, and the inclined hole wall of the conical hole can guide the oil to flow into the cylinder body 3 again; when the oil scraper ring 112 is located at the end of the shaft hole 111, the oil can splash in the radial direction due to the wiping force and adhere to the inner wall of the cylinder block 3 or the end surface of the oil seal structure 1 close to the oil. In other embodiments, the distance between two adjacent oil scraper rings 112 may be increased to increase the accommodation space. In addition, when using, can set up in oil blanket structure 1 with the communicating water conservancy diversion passageway of accommodation space to go out by the fluid water conservancy diversion of scraping, also can not set up the water conservancy diversion passageway, regularly change the oil blanket, in order to avoid fluid to store too much influence frizing effect in accommodation space. In addition, the oil scraper ring 112 may have a wedge shape, a small end of which is attached to the piston rod 2 and a large end of which is connected to the bore wall of the shaft hole 111, so that the frictional force between the oil scraper ring 112 and the piston rod 2 may be reduced, and the connection strength between the oil scraper ring 112 and the body 11 may be increased.

Specifically, as shown in fig. 3, the oil scraper ring 112 may be configured as an annular projection radially inward from the hole wall of the shaft hole 111. Since two alternately occurring frictional forces in opposite directions are generated between the piston rod 2 and the oil scraper ring 112 as the piston rod 2 reciprocates, which tends to loosen the joint of the oil scraper ring 112 and the bore wall of the shaft hole 111 or to cause the oil scraper ring 112 to fall off from the bore wall of the shaft hole 111, the oil scraper ring 112 is constructed as an annular projection radially inward from the bore wall of the shaft hole 111, that is, the oil scraper ring 112 is integrally formed with the body 1, and the joint of the oil scraper ring 112 and the bore wall can be increased in strength against the frictional forces; the connecting part of the oil scraper ring 112 and the hole wall can be smoothly transited, so that stress concentration is avoided.

According to some embodiments of the present disclosure, as shown in fig. 1 to 3, the oil seal structure 1 may include a housing 12, the housing 12 may be formed with a first through hole 121 for avoiding the piston rod 2, the body 11 may be disposed in the first through hole 121 and fixedly connected to the housing 12, an accommodating groove 122 may be disposed on a hole wall of the first through hole 121, and the body 11 may be fixed in the accommodating groove 122. Specifically, the oil seal structure 1 may include a housing 12 having a first through hole 121, such that the body 11 is disposed in the first through hole 121, and the shaft hole 111 of the body 11 may be coaxial with the first through hole 121, such that the piston rod 2 smoothly passes through the first through hole 121 to be attached to the oil scraper ring 112. The body 11 is fixedly connected with the hole wall of the first through hole 121, and may be bonded, clamped, screwed, etc., so as to resist the friction force between the piston rod 2 and the oil scraper ring 112, prevent the body 11 from moving relative to the housing 12, and facilitate oil scraping of the oil scraper ring 112. The receiving groove 122 may be formed on the hole wall of the first through hole 121, so that the body 11 is fixed in the receiving groove 122, and thus the body 11 is clamped in the receiving groove 122, which strengthens the limitation of the axial movement tendency of the body 11 along with the friction force. The shell 12 may be made of metal material, or other hard material with oil resistance and corrosion resistance, and may reinforce and protect the body 11 made of soft material. The body 11 may be fixed to the housing 12 through a vulcanization process, which is not limited herein.

According to some embodiments of the present disclosure, as shown in fig. 3, a radially inward coupling protrusion 123 may be formed on the bottom wall of the receiving groove 122, and a groove for coupling with the coupling protrusion 123 may be formed on the outer surface of the body 11. This increases the area of the connection between the housing 12 and the body 11, which makes the connection more secure and better restricts the movement of the body 11 in the axial direction. The connecting protrusions 123 may be in the form of a column protrusion, a block protrusion, an annular protrusion, etc., the number of the connecting protrusions 123 may be one or more, for example, as shown in fig. 3, and the connecting protrusions 123 may be three annular protrusions arranged at intervals in the axial direction.

According to a second aspect of the present disclosure, a shock absorber is provided, as shown in fig. 4 to 9, which can include a cylinder 3, a piston rod 2, and the oil seal structure 1, and has all the benefits of the oil seal structure 1, and the shock absorber can reduce or even avoid oil leakage, and simultaneously maintain good shock absorption and prolong the service life.

The oil seal structure 1 for preventing oil from leaking out may be installed outside the cylinder block 3 in a sealing manner, or may be installed inside the cylinder block 3 in a sealing manner, and according to some embodiments of the present disclosure, as shown in fig. 6 and 7, the oil seal structure 1 may be disposed in the cylinder block 3 and located at an end portion of the cylinder block 3, on the inner wall of which a receiving platform 31 may be formed to support the oil seal structure 1. Specifically, the oil seal structure 1 may be formed into a shape matching with an end inner cavity of the cylinder 3 to be accommodated in the cylinder 3, and the oil seal structure 1 may be hermetically bonded to an inner wall of the cylinder 3, or may be hermetically threaded to limit movement of the oil seal structure 1 relative to the cylinder 3; as shown in fig. 7, a receiving platform 31 may be formed on the inner wall of the cylinder 3 to support the oil seal structure 1 to prevent the oil seal structure 1 from moving toward the inside of the cylinder 3, and a sealant may be provided between the oil seal structure 1 and the cylinder 3 to prevent the oil seal structure 1 and the cylinder 3 from separating from the cylinder 3, and to prevent oil from leaking between the oil seal structure 1 and the cylinder 3. The receiving platform 31 may be formed by radially outwardly recessing the inner wall of the end portion of the cylinder 3, or may be formed by directly protruding from the inner wall of the end portion, which is not limited herein.

According to some embodiments of the present disclosure, as shown in fig. 4 to 9, the shock absorber may include a cover 4, the cover 4 may include a cover plate 41, a sealing edge 42, and a stop boss 43, wherein the sealing edge 42 may be disposed around a circumferential edge of the cover plate 41 to be connected with an end of the cylinder 3, and the stop boss 43 may be disposed on an inner surface of the cover plate 41 to cooperate with the receiving table 31 to limit the oil seal structure 1 from moving relative to the cylinder 3 in the axial direction of the cylinder 3. When oil blanket structure 1 is located the tip inner chamber of cylinder body 3, can set up closing cap 4 lock in the cylinder body 3 tip outside, be formed with the through-hole on the apron 41 of closing cap 4 in order to dodge piston rod 2, the banding 42 of closing cap 4 can cup joint on the outer wall of cylinder body 3 tip, and rather than firm connection, oil blanket structure 1 is located the space that closing cap 4 and cylinder body 3 surround like this, can protect oil blanket structure 1 from the pollution of external environment, and prevent oil blanket structure 1 to break away from cylinder body 3 at the shock absorber course of operation one-tenth, avoid causing the incident. A stop boss 43 may be formed on the inner surface of the cover plate 41, and when the sealing cover 4 is fastened to the opening at the end of the cylinder 3, the stop boss 43 may abut against the oil seal structure 1, so that the stop boss 43 and the receiving platform 31 are matched to limit the axial displacement of the oil seal structure 1. The stopping bosses 43 may be a plurality of convex structures, and are circumferentially and uniformly distributed on the inner surface of the cover plate 41 at intervals by taking the through hole on the cover plate 41 as a center, so that the force applied by the stopping bosses 43 to the oil seal structure 1 is uniformly distributed; the stop boss 43 may also be an annular protrusion centered on the through hole of the cover plate 41, which is not limited herein. The connection between the sealing edge 42 and the outer wall of the cylinder 3 may be a threaded connection, or may be a riveted connection or other connection, which is not limited herein.

According to a third aspect of the present disclosure, a suspension system is provided that may include the shock absorber described above. The suspension system has all the beneficial effects of the shock absorber, can reduce or even avoid the external leakage of oil, keeps good shock absorption and balance and prolongs the service life.

According to a fourth aspect of the present disclosure, there is provided a vehicle that may be provided with the suspension system described above. Based on the beneficial effect of above-mentioned suspension system, this vehicle has better security.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. An oil seal structure provided between an end portion of a cylinder block (3) storing oil and a piston rod (2), one end of the piston rod (2) being provided in the cylinder block (3) and being capable of reciprocating movement of extension and retraction with respect to the cylinder block (3), characterized in that the oil seal structure (1) includes a plurality of stages of oil scraper rings (112), the plurality of stages of oil scraper rings (112) being arranged at intervals in an axial direction, and the plurality of stages of oil scraper rings (112) being provided with increasing tolerance of fit with the piston rod (2) in a retraction direction of the piston rod (2).

2. The oil seal structure according to claim 1, characterized in that the oil seal structure (1) comprises a body (11), the body (11) is configured with a shaft hole (111) through which the piston rod (2) passes, the multistage oil scraper rings (112) are provided on a hole wall of the shaft hole (111), and the hole diameter of the shaft hole (111) between two adjacent oil scraper rings (112) increases in the retraction direction.

3. The oil seal structure according to claim 2, wherein the oil scraper ring (112) is configured as an annular projection radially inward from a bore wall of the shaft hole (111).

4. The oil seal structure according to claim 2, characterized in that the oil seal structure (1) comprises a housing (12), the housing (12) is formed with a first through hole (121) for avoiding the piston rod (2), the body (11) is arranged in the first through hole (121) and is fixedly connected with the housing (12), a receiving groove (122) is arranged on a hole wall of the first through hole (121), and the body (11) is fixed in the receiving groove (122).

5. An oil seal structure according to claim 4, characterized in that a radially inward coupling projection (123) is formed on the bottom wall of the receiving groove (122), and the outer surface of the body (11) is provided with a groove which is fitted with the coupling projection (123).

6. A shock absorber, characterized in that it comprises a cylinder (3), a piston rod (2) and an oil seal (1) according to any one of claims 1-5.

7. Shock absorber according to claim 6, wherein said oil seal (1) is provided in said cylinder (3) and at the end of said cylinder (3), a receiving table (31) being formed on the inner wall of the end of said cylinder (3) to support said oil seal (1).

8. Shock absorber according to claim 7, wherein the shock absorber comprises a cover (4), the cover (4) comprising a cover plate (41), a sealing edge (42) and a stop boss (43), the sealing edge (42) being provided around a circumferential edge of the cover plate (41) for connection with an end of the cylinder (3), the stop boss (43) being provided on an inner surface of the cover plate (41) for cooperating with the receiving table (31) for limiting a movement of the oil seal (1) relative to the cylinder (3) in an axial direction of the cylinder (3).

9. A suspension system comprising a shock absorber according to any one of claims 6 to 8.

10. A vehicle characterized in that it is provided with the suspension system of claim 9.

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