Hydraulic shock absorber

Abstract

The utility model provides a hydraulic shock absorber. The hydraulic shock absorber comprises an inner cylinder, a middle cylinder and an outer cylinder which are sequentially arranged from inside to outside in a sleeving mode. The inner cylinder is provided with a piston assembly, and the piston assembly and the cylinder wall of the inner cylinder form dynamic seal for oil liquid; an oil passing hole is formed in the cylinder wall of the inner cylinder and located below the moving stroke of the piston assembly, and the inner cylinder communicates with the middle cylinder through the oil passing hole. An adjusting valve is arranged between the middle cylinder and the outer cylinder, and the adjusting valve is configured to enable the outer cylinder and the middle cylinder to be communicated under the action of oil pressure. Impact force and resilience force can be effectively absorbed when a vehicle or equipment is impacted and when the vehicle or equipment rebounds after being impacted, bumping and shaking of a vehicle body can be reduced, and the control stability and the riding comfort are improved; and impact and stress on other parts (such as a suspension system and a vehicle body structure) of the vehicle can be reduced, so that the service life of the parts of the vehicle is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of shock absorbers, and in particular to a hydraulic shock absorber. Background Art

[0002] The working principle of hydraulic shock absorber is that when the frame (or body) and the axle vibrate and move relative to each other, the piston in the shock absorber moves up and down, and the oil in the shock absorber cavity repeatedly flows from one cavity to another through different pores. At this time, the friction between the pore wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vibration energy of the car is converted into oil heat energy, which is then absorbed by the shock absorber and dissipated into the atmosphere.

[0003] The hydraulic shock absorber of the prior art can absorb the vibration and discomfort generated when a vehicle or equipment rebounds after being impacted, but cannot take into account the dual-stage shock absorption when the vehicle or equipment is impacted and when the vehicle or equipment rebounds after being impacted. Utility Model Content

[0004] In order to overcome the defects of the above-mentioned prior art, the present application provides a hydraulic shock absorber, and the specific technical solution is as follows:

[0005] A hydraulic shock absorber comprises an inner cylinder, a middle cylinder and an outer cylinder which are sequentially sleeved from the inside to the outside;

[0006] The inner cylinder is provided with a piston assembly, and the piston assembly is configured to form a dynamic seal with the cylinder wall of the inner cylinder for the oil;

[0007] The cylinder wall of the inner cylinder is provided with an oil hole, the oil hole is located below the moving stroke of the piston assembly, and the inner cylinder and the middle cylinder are connected through the oil hole;

[0008] A regulating valve is provided between the middle cylinder and the outer cylinder, and the regulating valve is configured to communicate the outer cylinder and the middle cylinder under the action of oil pressure.

[0009] In a specific embodiment, the length of the intermediate cylinder is between 2.5 cm and 15 cm.

[0010] In a specific embodiment, the ratio of the distance between the oil hole and the top of the inner cylinder to the length of the inner cylinder is between 0.4 and 0.98.

[0011] In a specific embodiment, a connecting hole is provided on the cylinder wall of the intermediate cylinder, the regulating valve has a contact portion that contacts the intermediate cylinder, the contact portion extends into the connecting hole, and the cylinder wall thickness of the intermediate cylinder where the connecting hole is located is ≥3.5 mm, so that the intermediate cylinder and the contact portion are in surface contact with a preset area.

[0012] In a specific embodiment, the intermediate cylinder includes a first cylinder body portion, a second cylinder body portion and a third cylinder body portion, the second cylinder body portion is located between the first cylinder body portion and the third cylinder body portion, the cylinder wall thickness of the second cylinder body portion is greater than the cylinder wall thickness of the first cylinder body portion and the cylinder wall thickness of the third cylinder body portion, and the connecting hole is located in the second cylinder body portion.

[0013] In a specific embodiment, the outer surface of the cylinder wall of the intermediate cylinder includes a first surface and a second surface, the first surface is a curved surface, the second surface is a flat surface, and the connecting hole is located on the second surface.

[0014] In a specific embodiment, a first sealing assembly is disposed on the contact portion, and the first sealing assembly includes one or more first sealing members, which are disposed around the side wall of the contact portion and are located between the side wall of the contact portion and the hole wall of the connecting hole.

[0015] In a specific embodiment, a second sealing assembly is provided between the end of the intermediate cylinder and the inner cylinder, and the second sealing assembly includes more than two second sealing members;

[0016] An annular groove is provided at the end of the intermediate cylinder, and the two or more second seals are both located in the annular groove; or, two annular grooves are provided at the end of the intermediate cylinder, and the two or more second seals are respectively located in the two annular grooves.

[0017] In a specific embodiment, the ratio of the length of the middle cylinder to the length of the inner cylinder is between 0.1 and 1.

[0018] In a specific embodiment, the length of the second cylinder portion is ≥1.5 cm.

[0019] This application has at least the following beneficial effects:

[0020] A hydraulic shock absorber of the present application comprises an inner cylinder, an intermediate cylinder and an outer cylinder which are sequentially arranged from the inside to the outside; the inner cylinder is provided with a piston assembly, and the piston assembly is configured to form a dynamic seal with the cylinder wall of the inner cylinder for oil; the cylinder wall of the inner cylinder is provided with an oil hole, and the oil hole is located below the moving stroke of the piston assembly, and the inner cylinder and the intermediate cylinder are connected through the oil hole; a regulating valve is provided between the intermediate cylinder and the outer cylinder, and the regulating valve is configured to connect the outer cylinder and the intermediate cylinder under the action of oil pressure.

[0021] The oil hole of the hydraulic shock absorber provided in the present application is located below the moving stroke of the piston assembly, so that when the wheel is subjected to a large impact (for example, the vehicle encounters a pothole or a bump), the piston rod of the piston assembly moves downward, causing the oil in the inner cylinder to flow quickly to the middle cylinder, providing a greater damping force, which can effectively absorb and reduce the impact on the vehicle body.

[0022] Moreover, the oil is deposited at the bottom of the outer cylinder due to gravity. When the vehicle rebounds after a large impact, the piston rod of the piston assembly moves upward, allowing the oil in the outer cylinder to flow quickly to the middle cylinder and then into the inner cylinder, producing a damping effect, which can effectively absorb and reduce the impact of the rebound on the vehicle body.

[0023] The hydraulic shock absorber provided in the present application can effectively absorb the impact force and rebound force in two stages: when the vehicle or equipment is impacted and when the vehicle or equipment rebounds after the impact, which helps to reduce the bumps and shakes of the vehicle body, improves the handling stability and ride comfort; and can reduce the impact and stress on other parts of the vehicle (such as the suspension system, body structure, etc.), thereby extending the service life of the vehicle parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The structure of the hydraulic shock absorber provided in this embodiment is shown in FIG. Figure 1 ;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0027] Figure 3 The structure of the hydraulic shock absorber provided in this embodiment is shown in FIG. Figure 2 ;

[0028] Figure 4 The structure of the intermediate cylinder of the hydraulic shock absorber provided in this embodiment is schematically shown in FIG. Figure 1 ;

[0029] Figure 5 for Figure 4 Schematic diagram of the cross section along the AA line;

[0030] Figure 6 The structure of the intermediate cylinder of the hydraulic shock absorber provided in this embodiment is schematically shown in FIG. Figure 2 .

[0031] Reference numerals:

[0032] 1-inner cylinder; 2-middle cylinder; 3-outer cylinder; 4-piston assembly; 5-regulating valve; 6-first sealing assembly; 7-second sealing assembly; 11-oil hole; 21-first cylinder body; 22-second cylinder body; 23-third cylinder body; 24-annular groove; 51-contact portion; 61-first sealing member; 71-second sealing member; 221-first surface; 222-second surface; 2221-connecting hole; L1-distance between the oil hole and the top of the inner cylinder; L2-length of the inner cylinder; L3-length of the middle cylinder. DETAILED DESCRIPTION

[0033] Hereinafter, various embodiments of the present application will be described more fully. The present application may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present application to the specific embodiments disclosed herein, but the present application should be understood to cover all adjustments, equivalents and / or alternatives within the spirit and scope of the various embodiments of the present application.

[0034] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of a disclosed function, operation, or element, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present application, the terms "include", "have", and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components, or a combination of the foregoing or the possibility of adding one or more features, numbers, steps, operations, elements, components, or a combination of the foregoing.

[0035] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0036] The expressions (such as "first", "second", etc.) used in the various embodiments of the present application may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present application, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0037] It should be noted that in this application, unless otherwise clearly specified and defined, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, a person of ordinary skill in the art should understand that the terms indicating orientation or positional relationship herein are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0040] The upward and downward movement of the piston rod of the piston assembly of the hydraulic shock absorber is closely related to the driving state of the car, corresponding to the driving state and needs of the car in different situations. When the car encounters potholes, bumps or other uneven roads, the wheels are subjected to an upward impact force, and the piston rod moves downward; after the car passes over the uneven road surface, the wheels are subjected to a downward force, and the piston rod moves upward. The hydraulic shock absorbers of the prior art can absorb the vibration and discomfort caused by the rebound of the vehicle or equipment after being impacted to a certain extent, but when the vehicle or equipment is impacted, it is unable to absorb the impact and vibration generated by the vehicle or equipment in time.

[0041] Based on this, this embodiment provides a hydraulic shock absorber, such as Figures 1 to 6As shown, the hydraulic shock absorber includes an inner cylinder 1, an intermediate cylinder 2 and an outer cylinder 3 which are sequentially sleeved from the inside to the outside; the inner cylinder 1 is provided with a piston assembly 4, and the piston assembly 4 is configured to form a dynamic seal with the cylinder wall of the inner cylinder 1 for the oil; the cylinder wall of the inner cylinder 1 is provided with an oil hole 11, and the oil hole 11 is located below the moving stroke of the piston assembly 4, and the inner cylinder 1 and the intermediate cylinder 2 are connected through the oil hole 11; a regulating valve 5 is provided between the intermediate cylinder 2 and the outer cylinder 3, and the regulating valve 5 is configured to connect the outer cylinder 3 and the intermediate cylinder 2 under the action of the oil pressure.

[0042] The oil hole 11 of the hydraulic shock absorber provided in this embodiment is located below the moving stroke of the piston assembly 4, so that when the wheel is subjected to a large impact (for example, the vehicle encounters a pothole or a bump), the piston rod of the piston assembly 4 moves downward, allowing the oil in the inner cylinder 1 to flow quickly to the middle cylinder 2, providing a greater damping force, which can effectively absorb and reduce the impact on the vehicle body.

[0043] Moreover, the oil is deposited at the bottom of the outer cylinder 3 due to gravity. When the vehicle rebounds after a large impact, the piston rod of the piston assembly 4 moves upward, so that the oil in the outer cylinder 3 can quickly flow to the middle cylinder 2 and then enter the inner cylinder 1 (in other embodiments, a bottom valve is provided between the inner cylinder 1 and the outer cylinder 3, and the oil can also quickly flow from the outer cylinder 3 to the inner cylinder 1 through the bottom valve), producing a damping effect, which can effectively absorb and reduce the impact of the rebound on the vehicle body.

[0044] The hydraulic shock absorber provided in the present application can effectively absorb the impact force and rebound force in two stages: when the vehicle or equipment is impacted and when the vehicle or equipment rebounds after the impact, which helps to reduce the bumps and shakes of the vehicle body, improves the handling stability and ride comfort; and can reduce the impact and stress on other parts of the vehicle (such as the suspension system, body structure, etc.), thereby extending the service life of the vehicle parts.

[0045] like Figure 2 and Figure 3 As shown, in one embodiment, the ratio of the distance L1 between the oil hole and the top of the inner cylinder to the length L2 of the inner cylinder is between 0.4 and 0.98. In this embodiment, the oil hole 11 is opened on the middle cylinder wall or the lower cylinder wall of the inner cylinder 1 to increase the moving stroke length of the piston rod of the piston assembly 4, so that when the wheel encounters a pothole or a bump, the piston rod with a longer moving stroke can be more fully compressed, reducing the vibration directly transmitted to the vehicle body.

[0046] And increase the travel length of the piston rod of the piston assembly 4, so that during the movement of the piston rod, the damping force gradually increases with the increase of the travel length, so that the shock absorber has a progressive damping characteristic, so that the shock absorber can smoothly transition when absorbing a large impact.

[0047] In one embodiment, the ratio of the distance L1 between the oil hole and the top of the inner cylinder to the length L2 of the inner cylinder is between 0.6 and 0.9.

[0048] like Figure 2 and Figure 3 As shown, in one embodiment, the length L3 of the middle cylinder is between 2.5 cm and 15 cm. This embodiment shortens the length of the middle cylinder 2, making the production process simple, and can be processed by a lathe to obtain the required middle cylinder, which can be mass-produced and manufactured, and reduces the manufacturing cost; at the same time, the overall structure of the shock absorber is compact, which helps to reduce the space occupied by the vehicle suspension system; and reduces the materials required for manufacturing the middle cylinder, which helps to reduce the weight of the shock absorber, making the car lightweight, thereby reducing the energy consumption of the vehicle, and helping to improve the vehicle's handling and acceleration performance; and the shorter middle cylinder shortens the oil flow path inside the shock absorber, thereby improving the shock absorber's response speed to road impact, and can absorb and disperse impact energy more quickly, reduce the vibration and shaking of the vehicle body, and improve ride comfort and stability.

[0049] In one embodiment, the length L3 of the middle cylinder is between 3.5 cm and 6 cm.

[0050] like Figure 2 and Figure 3 As shown, in one embodiment, the ratio of the length L3 of the middle cylinder to the length L2 of the inner cylinder is between 0.1 and 1. This embodiment allows the user to set the length of the middle cylinder 2 according to the use requirements, so that the shock absorber has a wide range of applications.

[0051] When the ratio of the length L3 of the middle cylinder to the length L2 of the inner cylinder is small, the production process of the middle cylinder 2 is simple, the manufacturing cost is low, the overall structure of the shock absorber is compact, and the space occupied is small; moreover, less material is required to manufacture the middle cylinder, the weight of the shock absorber is light, the vehicle is lightweight, the energy consumption of the vehicle is low, and the vehicle's handling and acceleration performance are good; and the oil flow path inside the shock absorber is short, the shock absorber responds quickly to road impact, and absorbs and disperses impact energy quickly.

[0052] When the ratio of the length L3 of the middle cylinder to the length L2 of the inner cylinder is large, the middle cylinder 2 has more space to accommodate oil, so that the damping force has a smooth transition; at the same time, it accommodates more oil, so that the shock absorber has a large heat capacity and high heat dissipation efficiency, making the shock absorber's performance stable and its service life long.

[0053] like Figure 2As shown, in one embodiment, a second sealing assembly 7 is provided between the end of the middle cylinder 2 and the inner cylinder 1, and the second sealing assembly 7 includes more than two second sealing members 71. In this embodiment, two second sealing members 71 are provided at the end of the middle cylinder 2, thereby improving the sealing effect and preventing oil leakage. In one embodiment, the second sealing member 71 is a silicone ring, but is not limited thereto.

[0054] In one embodiment, a second sealing assembly 7 is provided between the inner cylinder 1 and one of the top end of the intermediate cylinder 2 and the bottom end of the intermediate cylinder 2. In another embodiment, a second sealing assembly 7 is provided between the top end of the intermediate cylinder 2 and the inner cylinder 1 and between the bottom end of the intermediate cylinder 2 and the inner cylinder 1.

[0055] In one embodiment, an annular groove is provided at the end of the intermediate cylinder 2 , and the two or more second sealing members 71 are located in the annular groove.

[0056] like Figure 5 As shown, in one embodiment, two annular grooves 24 are provided at the end of the intermediate cylinder 2 , and two or more second sealing members 71 are respectively located in the two annular grooves 24 .

[0057] like Figure 4 and Figure 5 As shown, in one embodiment, a connecting hole 2221 is provided on the cylinder wall of the intermediate cylinder 2, the regulating valve 5 has a contact portion 51 in contact with the intermediate cylinder 2, the contact portion 51 extends into the connecting hole 2221, and the cylinder wall thickness of the intermediate cylinder 2 where the connecting hole 2221 is located is ≥3.5 mm, so that the intermediate cylinder 2 and the contact portion 51 are in surface contact with a preset area.

[0058] In this embodiment, by increasing the thickness of the cylinder wall of the intermediate cylinder 2 where the connecting hole 2221 is located, the contact portion 51 is extended into the connecting hole 2221 and makes surface contact with the hole wall of the connecting hole 2221, thereby achieving surface contact between the contact portion 51 and the intermediate cylinder 2, thereby increasing the contact area between the regulating valve 5 and the intermediate cylinder 2 and stabilizing the connection between the regulating valve 5 and the intermediate cylinder 2.

[0059] The production process of the intermediate cylinder 2 is simplified, so that the cylinder wall of the intermediate cylinder 2 does not need to be provided with an extension portion to form a connecting hole, thereby reducing the production difficulty of the intermediate cylinder 2; at the same time, the connection process between the regulating valve 5 and the intermediate cylinder 2 is simplified, so that the regulating valve 5 and the intermediate cylinder 2 do not need to be connected by welding.

[0060] like Figure 2 , Figure 4 and Figure 5As shown, in one embodiment, a first sealing assembly 6 is provided on the contact portion 51, and the first sealing assembly 6 includes more than one first sealing member 61, and the first sealing member 61 is arranged around the side wall of the contact portion 51 and is located between the side wall of the contact portion 51 and the hole wall of the connecting hole 2221. In this embodiment, by arranging the first sealing member 61 between the side wall of the contact portion 51 and the hole wall of the connecting hole 2221, the sealing effect is improved and oil leakage is avoided.

[0061] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the outer surface of the cylinder wall of the intermediate cylinder 2 includes a first surface 221 and a second surface 222, the first surface 221 is a curved surface, the second surface 222 is a plane, and the connecting hole 2221 is located on the second surface 222. In this embodiment, the connecting hole 2221 is arranged on the second surface 222 which is a plane, thereby reducing the difficulty of assembling the contact portion 51 and the intermediate cylinder 2, and making the assembly between the contact portion 51 and the intermediate cylinder 2 easy.

[0062] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the middle cylinder 2 includes a first cylinder portion 21, a second cylinder portion 22 and a third cylinder portion 23, the second cylinder portion 22 is located between the first cylinder portion 21 and the third cylinder portion 23, the cylinder wall thickness of the second cylinder portion 22 is greater than the cylinder wall thickness of the first cylinder portion 21 and the cylinder wall thickness of the third cylinder portion 23, and the connecting hole 2221 is located in the second cylinder portion 22. This embodiment makes the thickness of each cylinder portion of the middle cylinder 2 inconsistent, so as to save the material required for manufacturing the middle cylinder 2, thereby reducing the weight of the shock absorber.

[0063] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the length of the second cylinder portion 22 is ≥1.5 cm. In this embodiment, the second cylinder portion 22 has a sufficiently large area to contact the regulating valve 5, so that the regulating valve 5 and the second cylinder portion 22 are stably connected.

[0064] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required for implementing the present application.

[0065] Those skilled in the art will appreciate that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0066] The above application serial numbers are for description only and do not represent the advantages or disadvantages of the implementation scenarios.

[0067] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic shock absorber, characterized in that: It includes an inner cylinder, a middle cylinder and an outer cylinder which are sequentially arranged from the inside to the outside; The inner cylinder is provided with a piston assembly, and the piston assembly is configured to form a dynamic seal with the cylinder wall of the inner cylinder for the oil; The cylinder wall of the inner cylinder is provided with an oil hole, the oil hole is located below the moving stroke of the piston assembly, and the inner cylinder and the middle cylinder are connected through the oil hole; A regulating valve is provided between the middle cylinder and the outer cylinder, and the regulating valve is configured to communicate the outer cylinder and the middle cylinder under the action of oil pressure.

2. The hydraulic shock absorber according to claim 1, characterized in that: The length of the intermediate cylinder is between 2.5 cm and 15 cm.

3. The hydraulic shock absorber according to claim 1, characterized in that: The ratio of the distance between the oil hole and the top of the inner cylinder to the length of the inner cylinder is between 0.4 and 0.

98.

4. The hydraulic shock absorber according to claim 1, characterized in that: A connecting hole is provided on the cylinder wall of the intermediate cylinder, and the regulating valve has a contact portion contacting the intermediate cylinder, and the contact portion extends into the connecting hole; The thickness of the cylinder wall of the intermediate cylinder where the connecting hole is located is ≥3.5 mm, so that the intermediate cylinder and the contact portion are in surface contact with each other at a preset area.

5. The hydraulic shock absorber according to claim 4, characterized in that: The intermediate cylinder includes a first cylinder body portion, a second cylinder body portion and a third cylinder body portion, the second cylinder body portion is located between the first cylinder body portion and the third cylinder body portion, the cylinder wall thickness of the second cylinder body portion is greater than the cylinder wall thickness of the first cylinder body portion and the cylinder wall thickness of the third cylinder body portion, and the connecting hole is located in the second cylinder body portion.

6. The hydraulic shock absorber according to claim 4, characterized in that: The outer surface of the cylinder wall of the intermediate cylinder includes a first surface and a second surface, the first surface is a curved surface, the second surface is a flat surface, and the connecting hole is located on the second surface.

7. The hydraulic shock absorber according to claim 4, characterized in that: The contact portion is provided with a first sealing assembly, which includes more than one first sealing member, which is arranged around the side wall of the contact portion and is located between the side wall of the contact portion and the hole wall of the connecting hole.

8. The hydraulic shock absorber according to claim 1, characterized in that: A second sealing assembly is provided between the end of the intermediate cylinder and the inner cylinder, and the second sealing assembly includes more than two second sealing members; An annular groove is provided at the end of the intermediate cylinder, and the two or more second seals are both located in the annular groove; or, two annular grooves are provided at the end of the intermediate cylinder, and the two or more second seals are respectively located in the two annular grooves.

9. The hydraulic shock absorber according to claim 1, characterized in that: The ratio of the length of the intermediate cylinder to the length of the inner cylinder is between 0.1 and 1.

10. The hydraulic shock absorber according to claim 5, characterized in that: The length of the second cylinder portion is ≥1.5 cm.

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