Improved structure of hydraulic shock absorber and hydraulic shock absorber thereof

Abstract

The invention provides an improved structure of a hydraulic shock absorber and the hydraulic shock absorber thereof.The improved structure of the hydraulic shock absorber comprises a compression cylinder located in the hydraulic shock absorber; the piston rod is connected to a piston of the hydraulic shock absorber, and the piston rod can be in sealing sliding fit with the compression cylinder; and the retaining structure is arranged at the end part of the piston rod in a sleeving manner, and the retaining structure can be rotatably sealed between the inner wall of the compression cylinder and the piston rod. According to the improved structure of the hydraulic shock absorber and the hydraulic shock absorber thereof, the compression chamber is used at the tail end of the compression stroke, so that the problem that damping force is increased when the compression stroke of the shock absorber is finished is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic braking, and in particular to an improved structure of a hydraulic shock absorber and the hydraulic shock absorber. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] Currently, in the field of mechanical engineering, hydraulic compression stop systems are devices used to control the movement and vibration of mechanical equipment. Traditional hydraulic compression stop systems usually use the position and speed of the piston rod to generate a predetermined damping force to control the movement of the equipment. However, as technology develops, the market demand for systems that can produce a progressive increase in damping force is growing.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The object of the present invention is to provide an improved structure of a hydraulic shock absorber and a hydraulic shock absorber thereof, which solves the problem that the extra force generated at the end of the compression stroke affects the performance of a standard valve by using a compression chamber at the end of the compression stroke.

[0006] The above-mentioned implementation objectives of the present invention are mainly achieved by the following technical solutions:

[0007] The present invention provides an improved structure of a hydraulic shock absorber, comprising an outer cylinder and a piston movably arranged in the outer cylinder, and also comprising a compression sealing mechanism capable of providing a progressive damping force, wherein the compression sealing mechanism has:

[0008] A compression cylinder, located inside the outer cylinder;

[0009] A piston rod connected to the piston, the piston rod being able to slide and seal with the compression cylinder;

[0010] A retaining structure is sleeved on the end of the piston rod, and the retaining structure can be rotatably sealed between the inner wall of the compression cylinder and the piston rod.

[0011] According to one embodiment of the present invention, the retaining structure includes a sealing ring and an open sealing ring stacked together, a boss is formed at the end of the piston rod, and the sealing ring and the open sealing ring are both sleeved on the boss and restricted on the boss by a retaining member.

[0012] According to one embodiment of the present invention, a notch is formed on the open sealing ring, and the notch and the opening of the open sealing ring are arranged opposite to each other along the diameter direction of the open sealing ring.

[0013] According to one embodiment of the present invention, the inner diameter of the sealing ring is the same as the inner diameter of the opening sealing ring, and both are larger than the outer diameter of the boss.

[0014] According to one embodiment of the present invention, the end surfaces of the sealing ring and the opening sealing ring that are disposed in contact with each other are formed with centering structures that can cooperate with each other.

[0015] According to one embodiment of the present invention, the centering structure includes a first bevel formed on the end face of the sealing ring, and a second bevel formed on the end face of the open sealing ring, wherein the first bevel is inclined radially outward in a direction away from the open sealing ring, and the second bevel is inclined radially outward in a direction away from the sealing ring.

[0016] According to one embodiment of the present invention, the inclination angle of the first inclined surface is the same as the inclination angle of the second inclined surface.

[0017] According to one embodiment of the present invention, the sealing ring is provided with an insert ring protruding in the direction of the open sealing ring, and the insert ring can extend into the open sealing ring.

[0018] According to one embodiment of the present invention, the retaining structure is a spring sealing ring, a convex column is formed at the end of the piston rod, and the spring sealing ring is sleeved on the convex column.

[0019] According to one embodiment of the present invention, the retaining structure is a sealing ring formed by splicing a plurality of arc-shaped parts together in sequence, and two adjacent arc-shaped parts are connected by elastic parts. A convex column is formed at the end of the piston rod, and the sealing ring is sleeved on the convex column.

[0020] According to one embodiment of the present invention, the elastic member is located between the sealing ring and the boss.

[0021] According to one embodiment of the present invention, the inner wall of the compression cylinder is provided with a damping groove extending along the axial direction thereof, and the damping groove extends from the opening of the compression cylinder to the bottom of the compression cylinder.

[0022] According to one embodiment of the present invention, there are a plurality of damping grooves, and the plurality of damping grooves are arranged at intervals along the circumferential direction of the compression cylinder.

[0023] The present invention also provides a hydraulic shock absorber, comprising an outer cylinder and a piston movably arranged in the outer cylinder, and the hydraulic shock absorber also comprises the improved structure of the hydraulic shock absorber as described above, and the improved structure is located in the hydraulic shock absorber.

[0024] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0025] The improved structure of the hydraulic shock absorber and the hydraulic shock absorber of the present invention can adjust and obtain the progressive characteristic of the increase in damping force by adding a compression sealing mechanism at the end of the compression stroke of the piston in the outer cylinder and by setting a plurality of damping grooves on the inner wall of the compression cylinder of the compression sealing mechanism, thereby avoiding the hydraulic shock absorber system from generating excessive force and damaging vehicle components. This structure enables the hydraulic shock absorber system to generate a progressively increasing damping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the improved structure of the hydraulic shock absorber of the present invention.

[0027] Figure 2 This is a cross-sectional view of the piston rod of the improved structure of the hydraulic shock absorber of the present invention extending into the compression cylinder.

[0028] Figure 3 for Figure 2 Enlarged view of part A in .

[0029] Figure 4 It is a schematic structural diagram of the open sealing ring of the present invention.

[0030] Figure 5 The bottom cross-sectional view of the improved structure of the hydraulic shock absorber of the present invention shows that the gap formed between the sealing ring and the compression cylinder is oriented so that the retaining structure is closer to the cylinder wall of the compression cylinder.

[0031] Figure 6 The bottom cross-sectional view of the improved structure of the hydraulic shock absorber of the present invention shows that the gap formed between the sealing ring and the compression cylinder is oriented and arranged at a position where the retaining structure is away from the cylinder wall of the compression cylinder.

[0032] Figure 7 It is an exploded view of the improved structure of the hydraulic shock absorber of the present invention.

[0033] Figure 8 It is a front view of a first embodiment of a holding structure of an improved structure of a hydraulic shock absorber according to the present invention.

[0034] Fig. 9 The improved structure of the hydraulic shock absorber of the present invention has a bottom view of the holding structure of the first embodiment Figure 1 .

[0035] Fig.10 A bottom view of a holding structure of a first embodiment of an improved structure of a hydraulic shock absorber of the present invention Figure 2 .

[0036] Fig.11 A perspective view of a seal ring of a retaining structure of a second embodiment of an improved structure of a hydraulic shock absorber according to the present invention.

[0037] Fig.12 This is a cross-sectional view of a holding structure of a third embodiment of an improved structure of a hydraulic shock absorber according to the present invention.

[0038] Fig.13 A perspective view of a retaining structure having a fourth embodiment of an improved structure of a hydraulic shock absorber according to the present invention.

[0039] Fig.14 It is a front view of a fifth embodiment of a holding structure of an improved structure of a hydraulic shock absorber according to the present invention.

[0040] Description of Figure Numbers:

[0041] 1. Outer cylinder; 2. Piston; 3. Improved structure of hydraulic shock absorber; 31. Compression cylinder; 311. Damping groove; 32. Piston rod; 321. Boss; 33. Retaining structure; 331. Sealing ring; 3311. Insert ring; 3312. First inclined surface; 332. Open sealing ring; 3321. Opening; 3322. Notch; 3323. Second inclined surface; 333. Arc-shaped member; 334. Elastic member; 34. Retaining member; 4. Adapter seat; 5. Centering structure; F1. Axis; F2. Axis; C1. Gap. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] Implementation Method 1

[0046] like Figure 1 As shown, the present invention provides an improved structure 3 of a hydraulic shock absorber, comprising a compression cylinder 31, a piston rod 32 and a retaining structure 33, wherein the compression cylinder 31 is located in the hydraulic shock absorber; the piston rod 32 is connected to the piston 2 of the hydraulic shock absorber, and the piston rod 32 can be sealed and slidably matched with the compression cylinder 31; the retaining structure 33 is sleeved on the end of the piston rod 32, and the retaining structure 33 can be rotatably sealed between the inner wall of the compression cylinder 31 and the piston rod 32.

[0047] The improved structure of the hydraulic shock absorber of the present invention is arranged at the end of the compression stroke of the piston in the outer tube 1 to adjust and obtain the progressive characteristic of the damping force increase, so as to avoid the hydraulic shock absorber system from generating excessive force and damaging vehicle components. The improved structure of the hydraulic shock absorber can enable the hydraulic shock absorber system to generate a progressively increasing damping force.

[0048] Specifically, Figure 1 As shown, the hydraulic shock absorber has an outer tube 1 and a piston 2 movably disposed in the outer tube 1, wherein the outer tube 1 is generally a cylindrical structure. Of course, the shape of the outer tube 1 can also be designed as other shapes according to actual needs, and the present application does not limit this. The piston 2 is movably arranged in the outer tube 1. In actual application, one end of the piston 2 extending out of the outer tube 1 is used to connect to an external mechanical device. For example, the improved structure of the hydraulic shock absorber can be used to control the vibration or movement of an external mechanical device.

[0049] The piston rod 32 is detachably connected to the end of the piston 2 extending into the outer tube 1. For example, a boss is formed at the end of the piston 2 extending into the outer tube 1, and a connecting groove is opened at the corresponding end of the piston rod 32. The piston 2 is inserted into the connecting groove of the piston rod 32 by its boss to achieve a detachable connection between the two. Of course, in other embodiments, the piston rod 32 and the piston 2 can also be connected by, for example, a threaded connection, or the piston rod 32 and the piston 2 can also be integrally formed, which is not limited here.

[0050] The bottom of the compression cylinder 31 is connected to the compression stroke end of the outer cylinder 1 through the adapter seat 4, and the opening of the compression cylinder 31 opposite to the bottom of the compression cylinder 31 is arranged opposite to the piston rod 32. The retaining structure 33 is sleeved on the end of the piston rod 32. When the piston 2 reciprocates in the outer cylinder 1, the piston rod 32 can reciprocate in the compression cylinder 31, and the retaining structure 33 can slide against the inner wall of the compression cylinder 31. In the present invention, the inner wall of the compression cylinder 31 is provided with a plurality of damping grooves 311, which extend along the axial direction of the compression cylinder 31 and extend from the opening of the compression cylinder 31 to the bottom of the compression cylinder 31. The plurality of damping grooves 311 are arranged at intervals along the circumferential direction of the compression cylinder 31, and the progressive characteristics of the increase in damping force can be adjusted and obtained through the plurality of damping grooves 311. Furthermore, in order to obtain a precise increase in the damping force, in the present embodiment, the width of the damping groove 311 may be gradually narrowed from the opening of the compression cylinder 31 to the bottom of the compression cylinder 31 .

[0051] like Figure 2 and Figure 3 As shown, the inventors found that when the piston 2 moves in the outer cylinder 1, it is inevitable that the axis F1 of the piston rod 32 connected to the piston 2 deviates from the axis F2 of the compression cylinder 31 located in the outer cylinder 1. When this misalignment problem occurs, the hydraulic shock absorption system will generate various forces, thereby affecting the normal operation of the shock absorber. In order to solve this problem, the inventors improved the retaining structure 33.

[0052] According to a feasible embodiment of the present invention, the retaining structure 33 includes a sealing ring 331 and an open sealing ring 332 stacked together, and a boss 321 is formed at the end of the piston rod 32. The sealing ring 331 and the open sealing ring 332 are both sleeved on the boss 321 and restricted on the boss 321 by the retaining member 34.

[0053] Specifically, Figure 4 As shown, the open sealing ring 332 has an opening portion 3321, which can not only compensate for the geometric shape error between the inner diameter of the compression cylinder 31 and the retaining structure 33 (the error is caused by production tolerances and thermal expansion of the material), but also enable the piston rod 32 to move radially to solve the problem of misalignment between the axis F1 and the axis F2.

[0054] In this embodiment, the inner diameter of the open sealing ring 332 is the same as the inner diameter of the sealing ring 331, and both are larger than the outer diameter of the piston rod 32, so that the open sealing ring 332 and the sealing ring 331 can both move radially relative to the piston rod 32, and both can rotate circumferentially around the piston rod 32, so as to further solve the problem of misalignment between the axis F1 and the axis F2.

[0055] When the piston rod 32 and the retaining structure 33 move relative to the axis F2 of the compression cylinder 31, the retaining structure 33 compensates for the error a between the axis F1 and the axis F2 and sets the open sealing ring 332 and the sealing ring 331 to the axis F2 position of the compression cylinder 31. When the improved structure of the hydraulic shock absorber is working, the retaining structure 33 can rotate on the piston rod 32.

[0056] like Figure 5 As shown, when the gap C1 between the open sealing ring 332 of the retaining structure 33 and the compression cylinder 31 is oriented so that the retaining structure 33 is closer to the cylinder wall of the compression cylinder 31, the area of ​​the oil flow in the gap C1 passing through the opening portion 3321 of the open sealing ring 332 is reduced; when the oil flow area is smaller, the oil volume restriction is larger, and the hydraulic brake system will generate a larger damping force.

[0057] like Figure 6 As shown, when the gap C1 between the open sealing ring 332 of the retaining structure 33 and the compression cylinder 31 is oriented to be set at a position where the retaining structure 33 is away from the cylinder wall of the compression cylinder 31, the area of ​​the oil flow in the gap C1 passing through the opening portion 3321 of the open sealing ring 332 increases; when the oil flow area is larger, the oil volume restriction is smaller, and the hydraulic brake system will generate a smaller damping force.

[0058] It can be seen that exposing and covering the gap C1 will cause a significant change in the oil flow area, which will make the damping force of the hydraulic shock absorbing system have a high variability. In order to solve this problem, the inventor has made further improvements to the structure of the open sealing ring 332.

[0059] According to one embodiment of the present invention, Figure 7 and Figure 8 As shown, a notch 3322 is formed on the open sealing ring 332, and the notch 3322 is arranged opposite to the opening portion 3321 of the open sealing ring 332 along the diameter direction of the open sealing ring 332. Specifically, the notch 3322 is a groove formed on the outer wall of the open sealing ring 332, and the opening direction of the notch 3322 is arranged opposite to the opening portion 3321 along the diameter direction of the open sealing ring 332.

[0060] In this embodiment, if Fig. 9 and Fig.10 As shown, when the sealing ring 331 of the retaining structure 33 moves radially relative to the piston rod 32, no matter it moves to the position where the opening portion 3321 of the open sealing ring 332 is located, or moves to the position where the groove 3322 of the open sealing ring 332 is located, the oil flow area in the gap C1 between the retaining structure 33 and the compression cylinder 31 can be maintained within a relatively stable area, so that the amount of oil flowing out through the gap C1 can be kept stable, thereby realizing the variability control of the damping force of the hydraulic shock absorption system.

[0061] Furthermore, in order to make the combination of the sealing ring 331 and the opening sealing ring 332 more stable and prevent the two from separating during the working process and affecting the function of the holding structure 33, as shown in FIG. Fig.11 As shown, the sealing ring 331 is provided with an insert ring 3311 protruding toward the direction of the open sealing ring 332 , and the insert ring 3311 can extend into the open sealing ring 332 .

[0062] Specifically, the outer diameter of the insertion ring 3311 is slightly smaller than the inner diameter of the open sealing ring 332, so that after the insertion ring 3311 is inserted into the open sealing ring 332 and the open sealing ring 332 produces a compression movement, it can compensate for the geometric error in the compression cylinder 31, and also achieve the characteristic of relatively fixed positions of the sealing ring 331 and the open sealing ring 332.

[0063] According to one embodiment of the present invention, Fig.12 As shown, the end surfaces of the sealing ring 331 and the opening sealing ring 332 that are arranged in contact with each other form a centering structure 5 that can cooperate with each other.

[0064] Specifically, the centering structure 5 includes a first bevel 3312 formed on the end face of the sealing ring 331, and a second bevel 3323 formed on the end face of the opening sealing ring 332. The first bevel 3312 is radially inclined outward in a direction away from the opening sealing ring 332, and the second bevel 3323 is radially inclined outward in a direction close to the sealing ring 331.

[0065] By setting the first inclined surface 3312 and the second inclined surface 3323, the sealing ring 331 and the opening sealing ring 332 can fit together better and ensure that the movement of the two relative to the piston rod 32 can be synchronized, further ensuring that the oil flow area in the gap C1 remains unchanged and the oil flow rate is stable.

[0066] According to one embodiment of the present invention, Fig.13 As shown, the retaining structure 33 is a spring sealing ring, and a convex column 321 is formed at the end of the piston rod 32 , and the spring sealing ring is sleeved on the convex column 321 .

[0067] By setting the retaining structure 33 as a spring sealing ring, the spring sealing ring adopts a spiral structure design, which allows the spring sealing ring to expand and compress during the operation of the improved structure of the hydraulic shock absorber. When the spring sealing ring moves into the compression cylinder 31, the inner wall of the compression cylinder 31 can apply pressure to the outer diameter of the spring sealing ring. Under the action of this pressure, the spring sealing ring begins to twist (similar to a coil spring) and adjusts its outer diameter to adapt to the inner diameter of the compression cylinder 31, so that the piston rod 32 moves radially to ensure that the axis F1 of the piston rod 32 is coaxially arranged with the axis F2 of the compression cylinder 31.

[0068] According to one embodiment of the present invention, Fig.14 As shown, the retaining structure 33 is a sealing ring composed of a plurality of arc-shaped parts 333 spliced ​​together in sequence, and two adjacent arc-shaped parts 333 are connected by elastic parts 334. A convex column 321 is formed at the end of the piston rod 32, and the sealing ring is sleeved on the convex column 321.

[0069] Specifically, in the present embodiment, there are four arc-shaped members 333, which are spliced ​​end to end to form an annular structure. The inner sides of two adjacent arc-shaped members 333 are connected by an arc-shaped elastic member 334. When the retaining structure 33 is sleeved on the boss 321, the elastic member 334 is located between the retaining structure 33 and the boss 321. These elastic members 334 can provide radial elastic force for the retaining structure 33 between the compression cylinder 31 and the boss 321. In addition, the retaining structure 33 composed of these arc-shaped members 333 can move radially on the boss 321 to compensate for the misalignment problem between the axis F1 of the piston rod 32 and the axis F2 of the compression cylinder 31. When the retaining structure 33 moves radially relative to the piston rod 32 and moves to the position of the opening portion 3321 of the open sealing ring 332 or the position of the groove 3322 radially opposite to the opening portion 3321, the oil flow area can be maintained at a relatively stable area, thereby maintaining the stability of the oil flow through the gap C1, thereby achieving the purpose of controlling the damping force of the hydraulic shock absorbing system.

[0070] Implementation Method 2

[0071] like Figures 1 to 14 As shown, the present invention also provides a hydraulic shock absorber, comprising an outer tube 1 and a piston 2 movably disposed in the outer tube 1, the hydraulic shock absorber also comprising the improved structure 3 of the hydraulic shock absorber as described above, the improved structure 3 being located in the hydraulic shock absorber. The specific structure and beneficial effects of the improved structure 3 of the hydraulic shock absorber are the same as those of the first embodiment, and will not be described in detail here.

[0072] The hydraulic shock absorber of the present invention adds an improved structure 3 of the hydraulic shock absorber at the end of the piston compression stroke in the outer tube 1 to adjust and obtain the progressive characteristics of the increase in damping force, thereby preventing the hydraulic shock absorber system from generating excessive force and damaging vehicle components. This structure enables the hydraulic shock absorber system to generate a progressively increasing damping force.

[0073] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An improved structure of a hydraulic shock absorber, characterized in that: include: A compression cylinder, located in the hydraulic shock absorber; A piston rod connected to the piston of the hydraulic shock absorber, wherein the piston rod can be in sealing and sliding cooperation with the compression cylinder; A retaining structure is sleeved on the end of the piston rod, and the retaining structure can be rotatably sealed between the inner wall of the compression cylinder and the piston rod.

2. The improved structure of the hydraulic shock absorber according to claim 1, characterized in that: The retaining structure comprises a sealing ring and an open sealing ring stacked together, a convex column is formed at the end of the piston rod, and the sealing ring and the open sealing ring are both sleeved on the convex column and restricted on the convex column by a retaining member.

3. The improved structure of the hydraulic shock absorber according to claim 2, characterized in that: A notch is formed on the open sealing ring, and the notch and the opening of the open sealing ring are arranged opposite to each other along the diameter direction of the open sealing ring.

4. The improved structure of the hydraulic shock absorber according to claim 2 or 3, characterized in that: The inner diameter of the sealing ring is the same as the inner diameter of the opening sealing ring, and both are larger than the outer diameter of the protruding column.

5. The improved structure of the hydraulic shock absorber according to claim 2, characterized in that: The end surfaces of the sealing ring and the opening sealing ring that are arranged in contact with each other form a centering structure that can cooperate with each other.

6. The improved structure of the hydraulic shock absorber according to claim 5, characterized in that: The centering structure includes a first inclined surface formed on the end surface of the sealing ring and a second inclined surface formed on the end surface of the open sealing ring. The first inclined surface is inclined radially outward in a direction away from the open sealing ring, and the second inclined surface is inclined radially outward in a direction away from the sealing ring.

7. The improved structure of the hydraulic shock absorber according to claim 6, characterized in that: The inclination angle of the first inclined surface is the same as the inclination angle of the second inclined surface.

8. The improved structure of the hydraulic shock absorber according to claim 3, characterized in that: The sealing ring is provided with an insert ring protruding toward the direction of the opening sealing ring, and the insert ring can extend into the opening sealing ring.

9. The improved structure of the hydraulic shock absorber according to claim 1, characterized in that: The retaining structure is a spring sealing ring, a convex column is formed at the end of the piston rod, and the spring sealing ring is sleeved on the convex column.

10. The improved structure of the hydraulic shock absorber according to claim 1, characterized in that: The retaining structure is a sealing ring formed by splicing a plurality of arc-shaped parts together in sequence, and two adjacent arc-shaped parts are connected by elastic parts. A convex column is formed at the end of the piston rod, and the sealing ring is sleeved on the convex column.

11. The improved structure of the hydraulic shock absorber according to claim 10, characterized in that: The elastic member is located between the sealing ring and the protruding column.

12. The improved structure of the hydraulic shock absorber according to claim 1, characterized in that: The inner wall of the compression cylinder is provided with a damping groove extending along the axial direction thereof, and the damping groove is extended from the opening of the compression cylinder to the cylinder bottom of the compression cylinder.

13. The improved structure of the hydraulic shock absorber according to claim 12, characterized in that: There are a plurality of damping grooves, and the plurality of damping grooves are arranged at intervals along the circumferential direction of the compression cylinder.

14. A hydraulic shock absorber, characterized in that: The hydraulic shock absorber comprises an outer cylinder and a piston movably disposed in the outer cylinder, and the hydraulic shock absorber further comprises an improved structure of the hydraulic shock absorber according to any one of claims 1 to 13, wherein the improved structure is located in the hydraulic shock absorber.

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