Shock absorber, suspension system and vehicle

Abstract

The embodiment of the invention provides a shock absorber, a suspension system and a vehicle. The shock absorber includes: a shock absorber cylinder having a first space and a second space; the piston valve is slidably arranged along the first space and divides the first space into a first cavity and a second cavity, and the first cavity is communicated with the second space; the first damping valve comprises a first inlet and a first outlet, and the first inlet is in one-way communication with the first outlet; the second damping valve comprises a second inlet and a second outlet, and the second inlet is in one-way communication with the second outlet; and the compression module divides the second cavity into a first sub-cavity and a second sub-cavity, and the second sub-cavity is used for storing gas, so that the second sub-cavity can be compressed or expanded along with the change of the pressure intensity of the first sub-cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a shock absorber for a suspension system, a suspension system and a vehicle. Background Art

[0002] The suspension system is a protective and shock-absorbing device for vehicles. It uses elastic elements to receive the vibrations caused by impacts when the vehicle is driving. In order to improve the smoothness of the car when driving, a shock absorber can be installed in parallel with the elastic element in the suspension system. Its working principle is that when the frame (or body) and the axle are vibrated 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 heat energy of the oil, which is then absorbed by the shock absorber and dissipated into the atmosphere.

[0003] However, the shock absorber in the prior art is a three-tube structure, in which the oil and gas are in the same space. This structure is prone to generate bubbles, resulting in unstable damping force output and low response speed of the piston movement at the moment of impact. This phenomenon causes the suspension system to be unable to accurately control the smoothness of the vehicle's driving, making it difficult to improve comfort.

[0004] Therefore, it is necessary to improve the existing shock absorber and optimize its buffering performance. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for a shock absorber, a suspension system and a vehicle.

[0006] According to a first aspect of the present invention, there is provided a vibration absorber, the vibration absorber comprising:

[0007] A shock absorber cylinder having a first space and a second space;

[0008] a piston valve, the piston valve being slidably arranged along the first space and dividing the first space into a first chamber and a second chamber, the first chamber being in communication with the second space;

[0009] a first damping valve, the first damping valve comprising a first inlet and a first outlet, the first inlet being in one-way communication with the first outlet, the first inlet being in communication with the second chamber, the first outlet being in communication with the second space, the first damping valve being used to control the damping magnitude of the communication from the second chamber to the second space;

[0010] a second damping valve, the second damping valve comprising a second inlet and a second outlet, the second inlet being in one-way communication with the second outlet, the second inlet being in communication with the second space, the second outlet being in communication with the second chamber, and the second damping valve being used to control the damping magnitude of the communication from the second space to the second chamber;

[0011] A compression module, wherein the compression module divides the second chamber into a first sub-chamber and a second sub-chamber, wherein the second sub-chamber is used to store gas, so that the second sub-chamber can be compressed or expanded as the pressure of the first sub-chamber changes.

[0012] Optionally, the compression module is a floating piston movably arranged in the second chamber, and the floating piston divides the second chamber into a first sub-chamber and a second sub-chamber. When the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, the floating piston is configured to move to compress the second sub-chamber.

[0013] Optionally, the floating piston (1031) comprises:

[0014] A piston body, wherein a side surface of the piston body is formed with an annular groove, wherein the annular groove has a first groove bottom and a second groove bottom, wherein the second groove bottom is located in the first groove bottom, and along the radial direction of the piston body, the depth of the second groove bottom is greater than the depth of the first groove bottom so that a step surface is formed between the second groove bottom and the first groove bottom;

[0015] An elastic sealing ring, wherein the elastic sealing ring is embedded in a groove formed by the step surface and the second groove bottom;

[0016] A piston ring is sleeved in the annular groove, and an inner surface of the piston ring is interference-fitted with the first groove bottom and the elastic sealing ring.

[0017] Optionally, a thickness of the elastic sealing ring is greater than a height of a step surface between the second groove bottom and the first groove bottom.

[0018] Optionally, along the radial direction of the piston body, the outer surface of the piston ring protrudes outward from the annular groove.

[0019] Optionally, an annular groove is formed at at least one side edge of the first groove bottom along the axial direction of the piston body;

[0020] The piston ring has a skirt corresponding to the annular groove, and the skirt is embedded in the annular groove.

[0021] Optionally, both side edges of the first groove bottom are formed with annular grooves.

[0022] Optionally, the annular groove has an inclined wall surface, and the skirt has an inclined surface corresponding to the inclined wall surface.

[0023] Optionally, the material of the piston ring is polytetrafluoroethylene.

[0024] Optionally, along the axial direction of the piston body, the width of the elastic sealing ring is less than or equal to the width of the second groove bottom.

[0025] Optionally, the thickness of the elastic sealing ring is 105% to 120% of the height of the step surface.

[0026] Optionally, the outer surface of the piston ring protrudes outward relative to the side surface of the piston body in a size ranging from 0.05 mm to 0.25 mm.

[0027] Optionally, a limiting structure is provided in the second chamber of the shock absorber cylinder, and the limiting structure is configured to limit the compression module to restrict the expansion of the second sub-chamber when the pressure in the second sub-chamber is greater than the pressure in the first sub-chamber.

[0028] Optionally, along the moving direction of the piston valve in the shock absorber cylinder, the limiting structure is located on a side of the first inlet and the second outlet away from the piston valve.

[0029] Optionally, the limiting structure is a limiting step formed on the inner wall of the second chamber;

[0030] When the pressure in the second sub-chamber is greater than the pressure in the first sub-chamber, the compression module can move to enlarge the second sub-chamber and abut against the limiting step.

[0031] Optionally, the second sub-chamber of the shock absorber cylinder is provided with a communication channel for inflating the second sub-chamber.

[0032] Optionally, the communication passage has a one-way valve structure, so that the communication passage forms a one-way conduction from the outside to the inside of the shock absorber cylinder.

[0033] Optionally, the communication channel has a switch control valve structure, and the switch control valve is used to control the opening and closing of the communication channel.

[0034] Optionally, the shock absorber cylinder has an inner cylinder and an outer cylinder surrounding the inner cylinder, the first space is a cylindrical cavity in the inner cylinder, and the second space is a cylindrical cavity between the inner cylinder and the outer cylinder;

[0035] The inner cylinder body is provided with an inner cavity hole, and the first chamber is communicated with the second space through the inner cavity hole.

[0036] Optionally, the piston valve forms a sealed contact with the inner surface of the first space, and along the movement direction of the piston valve in the shock absorber cylinder, the inner cavity hole is located on the side of the piston valve away from the second chamber, and the piston valve does not overlap with the inner cavity hole.

[0037] Optionally, a plurality of inner cavity holes are arranged on the inner cylinder body along the circumference surrounding the first space.

[0038] Optionally, a partition is formed on the shock absorber cylinder body, and along the movement direction of the piston valve, the partition is located at the end of the outer cylinder body close to the second chamber, and the partition closes the end of the second space to isolate the second chamber from the second space.

[0039] Optionally, a guide assembly is provided on the first end upper cover of the shock absorber cylinder body, a portion of the guide assembly is embedded in the inner cylinder body, and another portion of the guide assembly is embedded in the outer cylinder body, and the guide assembly forms relative positioning for the inner cylinder body and the outer cylinder body.

[0040] Optionally, an insertion hole is formed on the guide assembly;

[0041] The shock absorber also includes a piston rod, the piston valve is connected to the piston rod, the piston rod extends from the insertion hole of the guide assembly into the inner cylinder body, the piston valve forms a sealed contact with the inner surface of the inner cylinder body to divide the first space into a first chamber and a second chamber, the first chamber and the inner cavity hole are located on the side of the piston valve close to the first end.

[0042] The shock absorber comprises a limiter, and the limiter is arranged on the piston rod;

[0043] The piston valve can move between a first position and a second position in the shock absorber cylinder. When the piston valve is at the first position, the volume of the first chamber is a first volume. When the piston valve is at the second position, the volume of the first chamber is a second volume. The first volume is greater than the second volume.

[0044] Optionally, when the piston valve is located at the second position, the limiting member abuts against the guide assembly to limit the piston valve.

[0045] Optionally, when the piston valve is located at the first position, the piston valve abuts against the partition to limit the piston valve.

[0046] Optionally, the limiting member is sleeved and fixed on the piston rod.

[0047] Optionally, a first oil outlet communicating with the second space is formed on the outer cylinder, the first oil outlet is butted against the first outlet, and the first oil outlet includes a plurality of through holes;

[0048] The shock absorber cylinder body is formed with a second oil outlet communicating with the first sub-chamber, the second oil outlet is butted with the second outlet, and the second oil outlet includes a plurality of through holes.

[0049] Optionally, the plurality of through holes of the first oil outlet are arranged in an arc shape;

[0050] And / or, the multiple through holes of the second oil outlet are arranged in an arc shape.

[0051] Optionally, a first oil inlet communicating with the first sub-chamber is formed on the shock absorber cylinder, the first oil inlet is butted against the first inlet, and the first oil inlet and the first oil outlet are distributed on both sides of the partition in a position corresponding manner;

[0052] A second oil inlet communicating with the second space is formed on the outer cylinder body, the second oil inlet is connected to the second inlet, and the second oil inlet and the second oil outlet are distributed on both sides of the partition in a position corresponding manner.

[0053] Optionally, the compression module is an airbag module, which divides the second chamber into a first sub-chamber and a second sub-chamber. When the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, the airbag module is configured to deform to compress the second sub-chamber.

[0054] According to a second aspect of the utility model, a suspension system is provided, comprising a shock absorber as described in any one of the first aspects.

[0055] According to a third aspect of the utility model, a vehicle is provided, which is equipped with the suspension system as described in the second aspect.

[0056] According to a shock absorber provided by an embodiment of the utility model, the shock absorber separates the oil and gas in the second chamber through the setting of the air bag module, and uses the compression deformation capacity of the air bag module to provide buffering for the compression of the piston, thereby reducing the unstable output of the damping effect of the shock absorber and improving the vibration reduction performance of the shock absorber.

[0057] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0059] Figure 1 Schematic diagram of the structure of a shock absorber in one embodiment of the present invention.

[0060] Figure 2 yes Figure 1 A partial enlarged view of .

[0061] Figure 3 It is a partial structural sectional view of a shock absorber cylinder in one embodiment of the present invention.

[0062] Figure 4 It is a partial structural side view of a shock absorber cylinder in one embodiment of the present invention.

[0063] Figure 5 It is a partial structural schematic diagram of a shock absorber cylinder in one embodiment of the present invention.

[0064] Figure 6 It is an enlarged view of the local structure of the shock absorber in another embodiment of the present invention.

[0065] Figure 7 A side cross-sectional schematic diagram of a floating piston provided in an embodiment of the utility model.

[0066] Figure 8 A partially enlarged cross-sectional schematic diagram of a floating piston in a shock absorber cylinder provided by an embodiment of the utility model.

[0067] Fig. 9 A schematic structural diagram of a piston ring of a floating piston provided in an embodiment of the utility model.

[0068] Fig.10 A schematic structural diagram of a piston body of a floating piston provided in an embodiment of the utility model.

[0069] Fig.11 A cross-sectional schematic diagram of a floating piston in a shock absorber cylinder provided in an embodiment of the utility model.

[0070] Description of reference numerals:

[0071] 1. Third cylinder; 101. Third cylinder body; 102. Communication channel; 103. Compression module; 1031. Floating piston; 1032. Air bag module; 104. First oil outlet; 105. Baffle; 106. Second oil outlet; 107. Second oil inlet; 108. First oil inlet; 109. First sub-chamber; 110. Second sub-chamber; 111. Limiting step; 2. Damping valve; 21. First damping valve valve; 211, first inlet; 212, first outlet; 22, second damping valve; 221, second inlet; 222, second outlet; 3, shock absorber cylinder; 301, inner cylinder; 302, outer cylinder; 4, piston valve; 402, piston rod; 403, stopper; 5, guide assembly; 6, oil seal assembly; 7, inner cavity hole; 8, first space; 801, first chamber; 802, second chamber; 9, second space;

[0072] 1033. Piston body; 1034. Piston ring; 10341. Skirt; 1035. Elastic sealing ring; 1036. Second groove bottom; 1037. First groove bottom; 1038. Step surface; 1039. Annular groove. DETAILED DESCRIPTION

[0073] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0074] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0075] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0076] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred device or element 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.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or 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.

[0078] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0079] According to one embodiment of the present application, a vibration damper is provided. Figures 1 to 5 The shock absorber includes a shock absorber cylinder 3, a piston valve 4, a damping valve 2 and a compression module 103.

[0080] The shock absorber cylinder 3 may include an inner cylinder 301, an outer cylinder 302 and a third cylinder 1. The inner cylinder 301 forms a first space 8, and the inner cylinder 301 and the outer cylinder 302 form a second space 9. The piston valve 4 is slidably arranged along the first space 8, and divides the first space 8 into a first chamber 801 and a second chamber 802, and the first chamber 801 is connected to the second space 9. The third cylinder 1 is docked at the ends of the inner cylinder 301 and the outer cylinder 302, and the third chamber 1 is used to carry the damping valve 2 and the compression module 103. Figures 1 to 5 In the illustrated embodiment, the present application uses an independent third cylinder body 1, which is convenient for processing the inner cylinder body, the outer cylinder body and the third cylinder body, and can also more conveniently set the airbag module 1032 in the third cylinder body 1 and the damping valve 2 on the third cylinder body 1 during assembly. In other embodiments, the shock absorber cylinder body 3 can also adopt an integrated structure to carry structures such as the airbag module 1032 and the damping valve 2, and the present application is not limited to the use of the third cylinder body 1.

[0081] The damping valve 2 includes a first port and a second port, wherein the first port is connected to the second chamber 802, and the second port is connected to the second space 9, and the damping valve is used to limit the damping of the medium flow between the second chamber 802 and the second space 9. In practical applications, the inner cylinder 301, the outer cylinder 302 and the damping valve 2 may be filled with oil, and when the shock absorber is impacted, the piston valve 4 will move in the shock absorber cylinder 3. At this time, the oil will flow between the second space 9 and the second chamber 802 through the damping valve 2 to provide a buffering effect. The damping valve can limit the flow of the oil, thereby adjusting the magnitude of the buffering effect.

[0082] Optionally, the damping valve 2 may include a first damping valve 21 and a second damping valve 22, wherein the first damping valve 21 includes a first inlet 211 and a first outlet 212, which correspond to the first port and the second port, respectively. The first inlet 211 is in communication with the second chamber 802, and the first outlet 212 is in communication with the second space 9. The second damping valve 22 includes a second inlet 221 and a second outlet 222, which correspond to the first port and the second port of the second damping valve, respectively. The second inlet 221 is in communication with the second space 9, and the second outlet 222 is in communication with the second chamber 802. The two damping valves may be in a one-way conduction manner to achieve more precise control of the damping force.

[0083] The compression module 103 is disposed in the shock absorber cylinder 3, and forms a sealing relationship with the inner wall of the second chamber 802. Figure 1 and Figure 2 In the illustrated embodiment, the compression module 103 is disposed inside the third cylinder body 1 .

[0084] The compression module 103 can be enclosed with the second chamber 802 to form a certain space, and the second chamber 802 can be divided into a first sub-chamber 109 and a second sub-chamber 110 by forming a sealed connection or connection with the inner wall of the second chamber 802 through its edge. Figure 1 and Figure 2 In the illustrated solution, the compression module 103 is an optional floating piston 10311, and the second sub-chamber 110 is located below the floating piston 10311, that is, the space surrounded by the side of the floating piston 10311 away from the piston valve 4 and the inner wall of the second chamber 802 is the second sub-chamber. The second sub-chamber 110 is used to store gas, and when the piston valve 4 moves downward, the oil in the first sub-chamber 109 can squeeze the compression module 103, thereby compressing the gas in the second sub-chamber 110, so that the space of the second sub-chamber 110 is reduced.

[0085] Specifically, Figure 1As shown, the shock absorber cylinder 3 includes a third cylinder body 101, the inner cylinder 301 and the outer cylinder 302 in the shock absorber are fixedly docked with the lower end (second end) of the third cylinder body 101, and the damping valve 2 is connected to the peripheral side of the third cylinder body 101. The inner cylinder 301 and the space inside the third cylinder body 1 form a first space 8, and the inner cylinder 301 and the outer cylinder 302 form a second space 9. The third cylinder body 101 and the oil seal assembly 6 and the guide assembly 5 located at the upper end (first end) of the inner cylinder 301 can separate the first space 8 from the second space 9. The piston valve 4 can slide in the first space 8, and the piston valve 4 can separate the first space 8 into a first chamber 801 and a second chamber 802, the first chamber 801 is connected to the second space 9, and the second chamber 802 is provided with a compression module 103. The compression module 103 divides the second chamber 802 into a first sub-chamber 109 for accommodating oil and a second sub-chamber 110 that is not in contact with the oil, wherein the second sub-chamber 110 is used to store gas.

[0086] The damping valve 2 may include a first damping valve 21 and a second damping valve 22, wherein the first damping valve 21 is a one-way compression damping valve 2, and the second damping valve 22 is a one-way recovery damping valve 2. In an optional embodiment, only one damping valve may be used to provide damping for both compression and recovery expansion processes.

[0087] When the shock absorber is compressed, the piston valve 4 moves downward in the first space 8, and more structures of the piston valve 4 enter the shock absorber cylinder 3, which compresses the space of the second chamber 802, causing the pressure of the second chamber 802 to increase, and the pressure of the first sub-chamber 109 to increase, and the oil in the first sub-chamber 109 moves downward to compress or push the compression module 103, thereby compressing the gas in the second sub-chamber 110. At this time, the pressure of the first chamber 801 decreases, and the oil in the first sub-chamber 109 flows into the second space 9 through the first damping valve 21, and then flows into the first chamber 801, playing a role in buffering and shock reduction.

[0088] When the shock absorber is restored, the piston valve 4 moves upward in the first space 8, and the structure of the piston valve 4 gradually moves out of the shock absorber cylinder 3, the space of the second chamber 802 increases, the pressure decreases, and the pressure of the first sub-chamber 109 decreases. At this time, the gas pressure in the second sub-chamber 110 is greater, causing the second sub-chamber 110 to expand, the compression module 103 to deform or move upward, and the oil in the first sub-chamber 109 is squeezed by the compression module 103. In this state, since the piston valve 4 moves to the outside of the shock absorber cylinder 3, the pressure of the first chamber 801 increases, and the oil in the first chamber 801 flows into the second space 9, and then flows into the first sub-chamber 109 through the second damping valve 22, playing the role of restoring damping.

[0089] Therefore, the shock absorber in the embodiment of the present application effectively separates the oil in the first sub-chamber 109 and the gas in the second sub-chamber 110 through the arrangement of the compression module 103. On the one hand, when the piston valve 4 moves, the second sub-chamber 110 and the compression module 103 can first deform and respond to the impact force, thereby improving the vibration response speed of the shock absorber. On the other hand, the oil-gas separation design can prevent the gas from flowing in each chamber and reduce the possibility of unstable damping.

[0090] Optionally, the second damping valve 22 may also be a compression damping valve, in which case the first damping valve 21 is a restoring damping valve. Optionally, the damping valve 2 is connected to the peripheral side of the third cylinder body 101, and may be a fixed connection or a detachable connection. Those skilled in the art may select according to actual needs, and this application does not make any specific restrictions here.

[0091] In addition, the inner cylinder 301 and the outer cylinder 302 in the shock absorber can form an integral structure with one end of the third cylinder body 101, so that the shock absorber has a higher structural strength and a longer service life. Of course, the inner cylinder 301, the outer cylinder 302 and the third cylinder body 101 can also be manufactured separately, and then welded and butted to each other to assemble into an integral structure, so as to simplify the manufacturing difficulty and improve the manufacturing efficiency of the shock absorber.

[0092] It should be noted that the downward movement of the piston valve 4 in the first space 8 means that the piston valve 4 moves closer to the compression module 103 , and the upward movement of the piston valve 4 in the first space 8 means that the piston valve 4 moves away from the compression module 3 .

[0093] In one example, the compression module 103 is a floating piston 1031 , which divides the compression module 103 into a first chamber 109 and a second chamber 110 . The oil in the first chamber 109 can push the floating piston 1031 to move and compress the gas in the second chamber 110 .

[0094] Specifically, Figure 2 As shown, when the shock absorber is in a state of being impacted and then compressed, the piston valve 4 moves downward and occupies more volume of the cylinder. Since the oil is difficult to compress, it can push the floating piston 1031 to move downward and compress the gas in the second sub-chamber 110, thereby achieving the effect of buffering and shock absorption. When the shock absorber is in a state of not being impacted and the piston valve 4 is reset, the pressure in the first sub-chamber 9 decreases, and the gas pressure in the second sub-chamber 10 is relatively large. The second sub-chamber 10 pushes the floating piston 1031 to move upward and squeeze the first sub-chamber 9. The oil in the first sub-chamber pushes the piston valve 4 to move upward and reduce the occupation of the cylinder volume, thereby achieving reset.

[0095] In addition, the side of the floating piston 1031 away from the oil is a cylinder. The floating piston 1031 can effectively separate the oil and the gas in the cylinder, preventing the gas in the cylinder from entering the damping valve 2, causing the damping valve 2 to have problems such as instantaneous fluctuations in the damping force. It also makes the overall structure of the shock absorber simple, uses less material, is light in weight, and has lower manufacturing costs.

[0096] The floating piston 1031 may be a plunger-shaped structure, and an elastic sealing structure is provided on its side wall. The floating piston 1031 forms an interference fit with the inner wall of the second chamber 802 by using the elastic sealing structure on the side wall. This extrusion and sealing form can form a good isolation effect on the first sub-chamber 109 and the second sub-chamber 110 on both sides to prevent gas-liquid mixing. Furthermore, a sliding fit relationship can also be formed between the elastic sealing structure and the inner wall of the second chamber 802, that is, the floating piston 1031 can float up and down in the second chamber 802, and is used to respond to the impact formed by the shock absorber by moving downward or upward.

[0097] Optionally, in another example, the compression module 103 is an air bag module 1032, such as Figure 6 The airbag module 1032 can enclose a certain space and connect with the inner wall of the second chamber 802 through its edge, so that the second chamber 802 can be divided into a first sub-chamber 109 and a second sub-chamber 110. Figure 6In the scheme shown, the airbag module 1032 is in a bagged structure, and the second sub-chamber 110 is located in the space surrounded by the airbag module 1032. That is, the second sub-chamber 110 is the space enclosed by the airbag module 1032 and the inner surface of the lower end of the third cylinder body 1. The second sub-chamber 110 is used to store gas. The first sub-chamber 109 is located outside the airbag module 1032. When the piston valve 4 moves downward, the oil in the first sub-chamber 109 can squeeze the airbag module 1032, thereby compressing the gas in the second sub-chamber 110, causing the airbag module 1032 and the second sub-chamber 110 to deform. The airbag module 1032 and the second sub-chamber 110 constitute an airbag that can be compressed and deformed.

[0098] Specifically, when the shock absorber is in a compressed state, the piston valve 4 is compressed downward to occupy the cylinder volume. Since the oil cannot be compressed, it can squeeze the airbag module, thereby compressing the gas in the second sub-chamber 110 to achieve the effect of buffering and shock absorption. The airbag module can compress the second sub-chamber 110 by elastic deformation, or it can deform its own soft material to cause the second sub-chamber 110 to be compressed.

[0099] In addition, the airbag module can effectively separate oil and gas, avoiding the problem of instantaneous fluctuation of damping force caused by gas entering the damping valve, and also makes the overall structure of the shock absorber simple, with less material, light weight and lower manufacturing cost.

[0100] It should be noted that the downward movement of the piston valve 4 in the first space 8 means that the piston valve 4 moves closer to the airbag module 1032 , and the upward movement of the piston valve 4 in the first space 8 means that the piston valve 4 moves away from the airbag module 1032 .

[0101] In other optional examples, the compression module 103 includes a first sub-chamber 109 and an accumulator located in the first sub-chamber 109 , the accumulator has a second sub-chamber 110 , the second sub-chamber 110 is used to store gas, and the oil in the first sub-chamber 109 can compress the gas in the second sub-chamber 110 .

[0102] Specifically, when the shock absorber is in a compression state, the piston valve 4 is compressed downward to occupy the cylinder volume. Since the oil cannot be compressed, the accumulator can be squeezed to compress the gas in the second sub-chamber 110 to achieve the effect of buffering and shock absorption.

[0103] In addition, the accumulator can effectively separate oil and gas, avoiding the problem of instantaneous fluctuation of damping force caused by gas entering the damping valve, and also makes the overall structure of the shock absorber simple, with less material, light weight and lower manufacturing cost.

[0104] In one example, the third cylinder body 101 includes an oil inlet and an oil outlet, and the oil inlet and the oil outlet are connected to the damping valve 2 .

[0105] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, the third cylinder body 101 is provided with two groups of oil inlets and oil outlets, including a first oil inlet 108, a first oil outlet 104, a second oil inlet 107, and a second oil outlet 106. When the first damping valve 21 is a compression damping valve and the second damping valve 22 is a recovery damping valve, the first oil inlet 108 is communicated with the first inlet 211, the first outlet 212 is communicated with the first oil outlet 104, the second oil inlet 107 is communicated with the second inlet 221, and the second outlet 222 is communicated with the second oil outlet 106, so that the damping valve 2 is connected with the second space 9 and the second chamber 802 respectively.

[0106] Therefore, the shock absorber of the embodiment of the present application facilitates the damping valve 2 to play a damping role through the arrangement of the oil inlet and the oil outlet, thereby improving the use effect of the shock absorber and simplifying the overall structure of the shock absorber. The compression damping valve can control the on-off and damping size of the first inlet 211 and the first outlet 212, and the restoring damping valve can control the on-off and damping size of the second inlet 221 and the second outlet 222, so as to further improve the use effect of the shock absorber.

[0107] Optionally, the second chamber 802 of the shock absorber cylinder 3 may have a limiting structure. In an optional solution of the present application, the limiting structure is formed in the third cylinder body. The limiting structure is used to limit the deformation and movement of the compression module 103 to prevent it from excessively increasing the volume of the second sub-chamber 110. This limiting helps to limit the maximum stroke range of the piston valve 4, and can also make the shock absorber play a buffering role in the recovery and stretching stages. When the pressure in the second sub-chamber 110 is greater than the pressure in the first sub-chamber 109, the limiting structure can limit the deformation amount of the compression module 103 or the maximum position of the upward movement.

[0108] Along the moving direction of the piston valve 4, that is Figure 1 , Figure 2 and Figure 6In the up and down direction, the limiting structure is located on the side of the first port and the second port away from the piston valve. This feature means that the limiting structure is located below the first oil inlet 108, the first oil outlet 104, the second oil inlet 107, and the second oil outlet 106. The advantage of this feature is that if oil flows at the first port and the second port, and if the compression module 103 expands upward and moves to this area, the movement of the oil will be hindered, and the compression module 103 may be damaged due to the flow of the oil and the change in pressure. Therefore, in order to ensure that the function of the second sub-chamber 110 is not affected and its reliability is ensured, the present application adopts the method of setting the limiting structure on the side of the first port and the second port away from the piston valve to prevent the air bag module 1032 from affecting each other with the ports.

[0109] In one example, the limiting structure is a limiting step 111 formed on the inner wall of the second chamber 802 , and the limiting step 111 is located on a side of the oil inlet and the oil outlet away from the piston valve 4 .

[0110] Specifically, Figure 2 , Figure 3 As shown, the limiting step 111 can effectively limit the floating piston 1031 from being squeezed upward to an excessively high position by the gas in the second sub-chamber 110, thereby preventing the floating piston 1031 from being squeezed too much and causing blockage of the oil inlet and the oil outlet. When the air pressure in the second sub-chamber 110 is greater than the pressure in the first sub-chamber 109, the compression module 103 moves upward and expands, and can form abutment with the limiting step 111, thereby preventing it from moving further upward. The limiting step can be an annular step distributed in an annular shape on the inner wall of the second chamber 802, or it can be a plurality of step surfaces distributed in a discrete manner. Through this design, it can effectively block the movement of the compression module 103. For example, in the case where the compression module is a floating piston 1031, after the floating piston 1031 moves upward to a certain position, the limiting step can clamp the edge of the floating piston 1031, thereby preventing the floating piston 1031 from continuing to move upward, thereby limiting the maximum volume of the second sub-chamber 110.

[0111] In addition, the limiting step 111 also effectively prevents the compression module 103 from excessive movement and damage, avoids the failure of oil-gas separation of the shock absorber, and further ensures the sealing performance of the compression module 103.

[0112] In one example, the second sub-chamber 110 is provided with a communication channel 102 for inflating the second sub-chamber 110 .

[0113] Specifically, Figure 1 , Figure 2As shown, the communication channel 102 can be an air filling nozzle, through which a certain pressure of gas can be pre-filled into the second chamber 110, so as to realize the buffering and restoring damping of the shock absorber. The communication channel 102 can be provided to make the second chamber 110 have a predetermined pressure, and on the other hand, the buffering performance and response rate of the entire shock absorber can be adjusted through real-time or non-real-time air pressure control, so that the shock absorber can show ideal performance.

[0114] Optionally, a one-way valve structure may be provided on the connecting channel 102, and the one-way valve structure enables the connecting channel 102 to satisfy the function of transmitting air from the outside to the inside of the shock absorber cylinder 3, thereby realizing inflation adjustment. In another optional embodiment, a switch control valve structure may also be provided in the connecting channel 102. The switch control valve can control the on-off of the connecting channel 102. This embodiment is combined with an on-off relay that can be controlled in time and an air supply device that can charge and discharge air in time, so that the shock absorber can be controlled in time. Taking the actual use on a vehicle as an example, the vehicle can adjust the hardness, response sensitivity, and height (stroke) of the shock absorber according to the current road conditions or the control of the user, so as to achieve a better driving experience.

[0115] like Figure 1 , Figure 2 , Figure 6 As shown, the compression module 103 may be a floating piston 1031 or an air bag module 1032, and the inflation device 102 is an inflation nozzle, which can pre-charge a certain pressure of gas into the cylinder to fill the second chamber 110. Of course, when the compression module 103 includes an accumulator, the inflation device 102 may also be an inflation valve, and those skilled in the art may select one according to actual needs, and this application does not make any specific restrictions here.

[0116] Optionally, in Figure 1 to Figure 2 In the illustrated embodiment, the present solution adopts the form of an inner cylinder body 31 and an outer cylinder body 32 to form the first space 8 and the second space 9. The outer cylinder body 32 surrounds the inner cylinder body 31. The first space 8 is a cylindrical cavity in the inner cylinder body 31, and the second space 9 is a cylindrical cavity between the outer cylinder body 32 and the inner cylinder body 31. The cylindrical cavity can be a cylindrical cavity, or an elliptical cylinder or a polygonal prism cavity, and the present solution is not limited to this. In other optional embodiments, the first space and the second space may not be formed in the form of inner and outer cylinder bodies, and the first space and the second space may be formed by using multiple independent cylinder bodies or segmented cylinder space. Optionally, an inner cavity hole 7 is provided on the inner cylinder body 301, and the first chamber 801 is connected to the second space 9 through the inner cavity hole 7.

[0117] In one example, the piston valve 4 forms a sealing contact with the inner surface of the inner cylinder 31, thereby separating the first chamber 801 and the second chamber 802. The piston valve 4 can move up and down in the shock absorber cylinder 3.

[0118] Specifically, Figure 2 and Figure 5 As shown, along the moving direction of the piston valve 4, the setting position of the inner cavity hole 7 is higher than the maximum recovery position of the shock absorber, that is, the inner cavity hole 7 is always located on the side of the piston valve 4 away from the second chamber 802. In addition, the piston valve 4 will not overlap with the inner cavity hole 7. This ensures that the shock absorber can smoothly flow the oil from the first chamber 801 to the second space 9 through the inner cavity hole 7 when recovering, and also effectively prevents the inner cavity hole 7 from damaging the sealant of the piston valve 4.

[0119] In an example, a plurality of inner holes 7 are provided along the circumferential direction of the inner cylinder body 301 .

[0120] Specifically, Figure 5 As shown, the inner cavity holes 7 are preferably provided with four, and the four inner cavity holes 7 are arranged around the circumference of the inner cylinder body 301 , which helps the oil to flow quickly between the first chamber 801 and the second space 9 .

[0121] Of course, the inner cavity hole 7 can also be set to one, two or three, and those skilled in the art can choose according to actual needs, and this application does not make any specific restrictions here.

[0122] As for the implementation scheme in which the compression module 103 is an airbag module 1032, an optional implementation scheme is that the airbag module 1032 is cylindrical, that is, the middle of the airbag module 1032 is recessed downward, and the part close to the side wall of the third cylinder body is convex upward.

[0123] Specifically, the cylindrical air bag module 1032 can better cooperate with the piston valve 4. On the one hand, when the air bag module 1032 expands, it is easier to form a reliable and stable limit. On the other hand, due to the concave middle of the barrel structure, it is easier to be fully compressed by the oil in the first sub-chamber 109, and the performance during compression is more sensitive.

[0124] In an example, a partition plate 105 is formed on the third cylinder body 101 , and the partition plate 105 is used to isolate the second chamber 802 from the second space 9 .

[0125] Specifically, Figures 1 to 4As shown, along the up-and-down movement direction of the piston valve 4, the partition 105 is located at the lowermost end of the outer cylinder 32. That is, the end of the outer cylinder 32 close to the second chamber 802. The partition 105 seals the lower end of the second space 9, which isolates the second chamber 802 from the second space 9, so that the damping valve 2 can control the damping size of the first inlet 211, the first outlet 212, the second inlet 221, and the second outlet 222, so as to achieve the functions of buffering, shock absorption and restoring damping.

[0126] Among them, Figure 4 As shown, the partition 105 can also isolate the oil inlet and the oil outlet located on the same side. For example, the partition 105 can isolate the first oil inlet 108 from the first oil outlet 104, and isolate the second oil inlet 107 from the second oil outlet 106, so that the damping valve 2 can control the damping size of the first inlet 211, the first outlet 212, the second inlet 221, and the second outlet 222, thereby achieving the functions of buffering and shock absorption and restoring damping.

[0127] In addition, the oil inlet and the oil outlet located on the same side of the partition are preferably one large oil inlet and three small oil outlets, so as to realize the buffering damping and restoring damping of the shock absorber.

[0128] Alternatively, if Figure 1 As shown, the first end of the shock absorber cylinder 3, that is, the upper cover, is provided with a guide assembly 5, a part of the guide assembly 5 is embedded in the inner cylinder 31, and the other part is embedded in the outer cylinder 32. The guide assembly 5 plays a role in relative positioning and fixing the inner cylinder 31 and the outer cylinder 32. During actual assembly, the inner cylinder and the outer cylinder can be fixed to the third cylinder body by welding or the like, and the guide assembly 5 cooperates to play a positioning role. Furthermore, the guide assembly 5 can be provided with an insertion hole for cooperating with the piston valve 4.

[0129] In an example, the piston valve 4 further includes a limiter 403 , and the shock absorber may further include a piston rod 402 .

[0130] Specifically, Figure 1As shown, the shock absorber includes a stopper 403 and a piston rod 402 for guiding the piston valve 4. The piston valve 4 is fixedly connected to one end of the piston rod 402 close to the compression module 103, and the stopper 403 is fixedly connected to the piston rod 402, and the stopper 403 is located on the side of the piston valve 4 away from the compression module 103. The piston rod 402 passes through the insertion hole on the guide assembly 5 so that the piston valve 4 and the stopper 403 are inserted into the inner cylinder 301. The stopper 403 can effectively prevent the piston rod 402 from slipping out of the inner cylinder 301. When the pressure outside the shock absorber is reduced, the piston valve will move outward from the first end of the shock absorber cylinder and restore. At this time, the stopper 403 is configured to abut against the guide assembly 5 to limit the piston valve 4, prevent the piston valve 4 from slipping out too much upward, and prevent the piston valve 4 from overlapping with the inner cavity hole 7. The guide assembly 5 can play multiple functions such as positioning the cylinder body, matching assembly, and limiting the piston valve 4.

[0131] Optionally, the piston valve 4 can move between a first position and a second position in the shock absorber cylinder. When the piston valve 4 is at the first position, the volume of the first chamber 801 is a first volume. When the piston valve 4 is at the second position, the volume of the first chamber 801 is a second volume. The first volume is greater than the second volume.

[0132] Optionally, when the piston valve 4 is located at the second position, the limiting member 403 abuts against the guide assembly 5 to limit the piston valve.

[0133] Optionally, when the piston valve 4 is located at the first position, the piston valve 4 abuts against the partition 105, and a pair of the piston valves form a limit. The partition 105 in the technical solution of the present application can be formed by the third cylinder body 101, which can form a flange that partially extends into the inner surface of the inner cylinder body 31, and the flange can be used to form a match with the piston valve 4 to achieve limit.

[0134] Optionally, the limiter 403 is fixed on the piston rod 402 in a sleeve-type manner, which is similar to the fixing method of the piston valve 4, with a simple assembly process and consistent structural reliability. Moreover, when the sleeve-type limiter 403 forms an abutment limit, it can form a uniform limit force on the piston valve 4 relative to the guide assembly 5, reducing the risk of the piston valve 4 being offset or not moving smoothly.

[0135] Further optionally, the limiting member 403 may also be fixedly connected to an end of the piston rod 402 close to the compression module 103 to prevent the piston rod 402 from over-compressing the first sub-chamber 109 .

[0136] The guide assembly 5 is also used to guide the up and down movement of the piston rod 402 to improve the working efficiency of the shock absorber. The shock absorber also includes an oil seal assembly 6. Figure 1 As shown, the oil seal assembly 6 is used to seal the first space 8 and the second space 9 to prevent oil leakage in the first space 8 and the second space 9.

[0137] For the specific location of each oil outlet and oil inlet, this solution provides an implementation method. Figures 2 to 4 As shown, a first oil outlet 104 connected to the second space 9 is formed on the outer cylinder body 32, and the first oil outlet 104 is used to dock with the first outlet 212. In particular, the first oil outlet 104 may include a plurality of through holes, that is, the entire first oil outlet 104 is composed of a plurality of through holes. The first oil outlet 104 composed of a plurality of through holes can improve the smoothness of liquid circulation. When the piston valve 4 moves, the instantaneous pressure change may be large. In order to respond to this pressure change, the damper 2 conducts the oil between the first sub-chamber 109 of the second chamber 802 and the second space 9. The multiple through holes of the first oil outlet 104 can quickly relieve pressure and make the oil flow smoothly.

[0138] Furthermore, the shock absorber cylinder 3 may be formed with a second oil outlet 106 communicating with the first sub-chamber 109. Figures 2 to 4 In the illustrated embodiment, the second oil outlet 106 is provided on the structure of the third cylinder body 101 for forming the first sub-chamber 109. The second oil outlet 106 is connected to the second outlet 222, and the second oil outlet 106 may also include a plurality of through holes, which are used to provide a smooth and unobstructed liquid flow space when the oil needs to flow from the second space 9 to the first sub-chamber 109.

[0139] Alternatively, if Figure 3 and Figure 4 As shown, the multiple through holes of the first oil outlet 104 and / or the second oil outlet 106 can be arranged in an arc shape. This arrangement is conducive to the smooth flow of oil, avoiding the concentration of high hydraulic pressure in a small specific area and preventing it from flowing to the low pressure area. The multiple through holes distributed in an arc shape can evacuate the pressure, so that the oil forms a better pressure relief area in the area corresponding to the first outlet 212 and the second outlet 222, thereby improving the fluidity of the oil.

[0140] Optionally, the shock absorber cylinder 3 is formed with a first oil inlet 108 communicating with the first sub-chamber 109, the first oil inlet 108 is connected to the first inlet 221, and the first oil inlet 108 and the first oil outlet 104 are relatively located on the upper and lower sides of the partition 105. The first oil inlet 108 and the first oil outlet 104 are located at substantially corresponding positions on the upper and lower sides of the partition 105, and are used to cooperate with the first damping valve 21. Accordingly, Figure 3 As shown, the outer cylinder 32 is formed with a second oil inlet 107 communicating with the second space 9. In an optional manner, the second oil inlet 107 is formed on the third cylinder body 101. The second oil inlet 107 is used to dock with the second inlet 221. The second oil inlet 107 and the second oil outlet 106 are distributed on both sides of the partition in a position corresponding to each other. The symmetrical distribution form helps to cooperate with the damping valve to achieve control of the oil.

[0141] Optionally, the airbag module 1032 can be made of an elastic film material, such as an elastic bag. The edge of the elastic bag can be fixedly connected to the inner wall of the third cylinder body 101 to form a sealed connection, thereby sealing and forming the second sub-chamber 110. The elastic bag can better achieve elastic deformation, facilitate the compression and expansion of the gas, and cooperate with the compression and shock absorption effect of the shock absorber. Figure 2 As shown, the second sub-chamber can be located at the second end of the entire shock absorber cylinder 3 away from the piston valve, that is, at the lower end. In this way, the second sub-chamber 110 can be away from the piston valve 4 and the opening for oil flow, reducing the possibility of the second sub-chamber 110 interfering with the flow of oil, and also reducing the risk of damage to the second sub-chamber 110 and the airbag module 1032. Furthermore, the connecting channel 102 can also be located at the second end of the shock absorber cylinder 3 to reduce the interference of gas flushing on the oil area.

[0142] In other embodiments, the air bag module 1032 may also be made of other soft and easily deformable materials, preferably materials with good elastic deformation capability.

[0143] like Figure 7 and Figure 8 As shown, the technical solution also provides an improvement of a floating piston, which can form a tight fit seal with the inner wall of the cylinder body in the shock absorber cylinder body, and can float up and down along the cylinder body to achieve piston performance.

[0144] The floating piston includes a piston body 1033, an elastic sealing ring 1035 and a piston ring 1034. The piston body 1033 is a relatively flat cylindrical structure as a whole, and the side of the piston body 1033 refers to the cylindrical surface of its outer circumference. An annular groove is formed on the side of the piston body 1033, and the annular groove is concave toward the center along the radial direction of the piston body 1033. The annular groove is mainly used to provide a positioning, fixing and accommodating space for the elastic sealing ring 1035 and the piston ring 1034 that are sleeved around the piston body 1033. Figure 7 and Figure 8 As shown in FIG. 1 , the annular groove has a first groove bottom 1037 and a second groove bottom 1036, wherein the second groove bottom 1036 is located in the first groove bottom 1037. Moreover, along the radial direction of the piston body 1033, the overall depth of the second groove bottom 1036 is greater than the overall depth of the first groove bottom 1037. Figure 7 As shown, the second groove bottom 1036 is located inside the first groove bottom 1037, and the second groove bottom 1036 is more recessed toward the central axis of the piston body relative to the first groove bottom 1037, and the second groove bottom 1036 is recessed deeper.

[0145] Optionally, in other embodiments, the piston body may also be in the form of an elliptical cylinder, a polygonal cylinder, etc., and its side wall represents a cylindrical surface, which is not limited in the present application.

[0146] Thus, a step surface 1038 and two layers of receiving grooves can be formed between the first groove bottom 1037 and the second groove bottom 1036. The receiving groove formed by the step surface 1038 and the second groove bottom 1036 is used to accommodate the elastic sealing ring 1035, and the first groove bottom 1037 is used to carry the piston ring 1034 sleeved thereon.

[0147] The elastic sealing ring 1035 is embedded in the groove formed by the step surface 1038 and the second groove bottom 1036. The elastic sealing ring 1035 itself has a certain elastic deformation performance. Preferably, the elastic sealing ring 1035 can be tightened and strangled on the second groove bottom 1036, thereby increasing its assembly reliability.

[0148] The piston ring 1034 is sleeved in the annular groove. Figure 7 and Figure 8 As shown, the piston ring 1034 covers the outside of the elastic sealing ring 1035 in the radial direction. Further, the inner surface of the piston ring 1034 is substantially in contact with the first groove bottom 1037. In particular, an interference fit is formed between the inner surface of the piston ring 1034, the first groove bottom 1037 and the elastic sealing ring 1035, and the inner surface of the piston ring 1034 can be in contact with the first groove bottom 1037 and the elastic sealing ring 1035.

[0149] In practical applications, the diameter of the inner surface of the piston ring 1034 can be designed to be slightly smaller than the diameter of the first groove bottom 1037, so that the piston ring 1034 can form an extrusion-type interference fit with the first groove bottom 1037. Further, the diameter of the outer surface of the elastic sealing ring 1035 can be slightly larger than the diameter of the first groove bottom 1037, and / or a portion of the structure on the inner surface of the piston ring 1034 can be embedded in the area where the second groove bottom 1036 is located, that is, extending into the step surface 1038. Both of the above forms can make the outer surface of the elastic sealing ring 1035 and the inner surface of the piston ring 1034 form an extrusion-type interference fit.

[0150] By adopting the design of the present technical solution, the piston ring 1034 and the elastic sealing ring 1035 are a two-layer nested structure, and the inner elastic sealing ring 1035 is used to provide elasticity and compression force, and to provide the piston ring 1034 with a radially outward tightening effect. The outer piston ring 1034 is used to form an extrusion seal with the inner surface of the shock absorber cylinder body, and to achieve relative sliding. The double-layer nested structure can provide a more stable sealing effect. Furthermore, the annular groove of the present solution is designed with a two-layer groove structure, which corresponds to the elastic sealing ring 1035 and the piston ring 1034 respectively, and cooperates with an interference fit. This design can provide good positioning and fixing effects for the elastic sealing ring 1035 and the piston ring 1034, and avoid the risk of fatigue, dislocation, and falling off of the piston ring 1034 when sliding with the shock absorber cylinder body 3 for a long time.

[0151] Optionally, the thickness of the elastic sealing ring 1035 along the radial direction is preferably greater than the height of the step surface 1038 between the second groove bottom 1036 and the first groove bottom 1037. That is, the elastic sealing ring 1035 protrudes outward a little in the radial direction relative to the surface of the second groove bottom 1036. In this way, the piston ring 1034 can form an extrusion contact with the elastic sealing ring 1035 without having to form a special-shaped structure on the inner surface, forming an interference fit relationship. Moreover, this design form can better push the piston ring 1034 outward from the inner elastic sealing ring 1035, providing the piston ring 1034 with better sealing and extrusion between the shock absorber cylinder 3.

[0152] Optionally, along the radial direction of the piston body 1033, the outer surface of the piston ring 1034 protrudes outwards by a short distance relative to the side wall of the piston body 1033. That is, the outer surface of the piston ring 1034 protrudes outwards of the annular groove. The size of the protrusion is related to the ability to better allow the piston ring 1034 to be aligned with the annular groove. Figure 8The shock absorber cylinder 3 shown forms an extrusion contact, forming a sealing fit relationship. Moreover, the piston ring 1034 protrudes outward to protect the piston body 1033, reducing the direct rigid friction and contact between the side wall of the piston body 1033 and the inner wall of the shock absorber cylinder 3, thereby improving the structural reliability and service life of the piston body 1033.

[0153] In particular, if Figures 7 to 10 As shown, the piston body 1033 may also be formed with an annular groove 1039. Along the axial direction of the piston body 1033, the annular groove 1039 may be formed on both sides of the first groove bottom 1037. It is preferred that the annular groove 1039 is formed on at least one side of the first groove bottom 1037. Figure 8 and Fig. 9 As shown, the annular groove 1039 can be formed on the upper side and / or the lower side of the first groove bottom 1037 .

[0154] The annular groove 1039 is used to further fix and position the piston ring 1034 to prevent it from axially displacing relative to the piston body 1033 when the piston moves. A protruding skirt 10341 may also be formed on the piston ring, and the position of the skirt 10341 corresponds to the position of the annular groove 1039. If the annular groove 1039 is formed only on one side of the first groove bottom 1037, then correspondingly, the skirt 10341 is also formed only on the corresponding side of the piston ring 1034. Further, in the embodiment where the annular grooves 1039 are formed on both sides of the first groove bottom 1037, as Figures 7 to 10 As shown, two skirts 10341 may be formed on the piston ring 1034 .

[0155] During actual assembly, the skirt 10341 can be embedded in the annular groove 1039, thereby further positioning the piston ring 1034 and the piston body 1033. Preferably, the embodiment in which the annular grooves 1039 are formed on both sides of the first groove bottom can better provide positioning for the piston ring 1034, and on the other hand, it is also more helpful to form an interference fit between the piston ring 1034 and the elastic sealing ring 1035. The squeezing effect of the two annular grooves 1039 from both sides can make the inner surface of the piston ring 1034 better contact and fit with the outer surface of the elastic sealing ring 1035.

[0156] Alternatively, if Figure 7 , Figure 8 and Fig.11As shown, the annular groove 1039 may have an inclined wall surface. The skirt 10341 has an inclined surface corresponding to the inclined wall surface. The inclined wall surface facilitates the assembly of the piston ring 1034, so that it can more conveniently fit with the first groove bottom 1037 and the elastic sealing ring 1035. It is avoided that the skirt 10341 and the first groove bottom 1037 form a counteracting relationship during assembly, which causes assembly difficulties.

[0157] On the other hand, Figure 8 As shown, the inclined wall extends axially to the upper and lower sides, and the skirt 10341 fits with it. This design mode is more conducive to forming a tightening effect on the piston ring 1034 on the upper and lower sides, especially when the outer surface of the piston ring 1034 is squeezed by the shock absorber cylinder 3, the skirts 10341 on both sides generate an outward force and slight deformation on the upper and lower sides, so that the elastic sealing ring 1035 can better form a close contact with the inner surface of the piston ring 1034 to ensure the sealing effect.

[0158] Optionally, the piston ring is made of polytetrafluoroethylene. As an industrial material, polytetrafluoroethylene itself has good lubrication performance and can better form a sliding fit with the metal surface. The piston ring is made of this industrial material, which is more conducive to forming a sliding fit with the shock absorber cylinder, while ensuring sealing, and preventing the medium in the two cavities separated by the floating piston 1031 in the shock absorber cylinder from exchanging with each other.

[0159] Alternatively, if Figure 7 and Figure 8 As shown, along the axial direction of the piston body 1031, the width of the elastic sealing ring 1035 can be slightly smaller than the width of the second groove bottom 1036. That is, a small gap is left on both sides of the elastic sealing ring 1035. This design can leave a certain amount of space for elastic deformation of the elastic sealing ring 1035. In actual application, the piston ring 1034 will form an extrusion fit with the elastic sealing ring 1035, and the elastic sealing ring 1035 can deform into the space gap surrounded by the second groove bottom 1036 and the step surface 1039 to avoid being in a state of high-pressure extrusion continuously, causing elastic fatigue. Moreover, the design of this gap can provide a certain amount of self-elastic adjustment space when the floating piston 1031 is subjected to different degrees of pressure, which helps to improve the overall piston movement performance of the floating piston 1031.

[0160] Optionally, along the radial direction, the thickness of the elastic sealing ring 1035 can be 105% to 120% of the height of the step surface 1038. As described above, the thickness of the elastic sealing ring 1035 is slightly greater than the height of the step surface 1038. This design is preferably within a certain numerical ratio range and can show a better elastic sealing effect. If the thickness of the elastic sealing ring 1035 is less than 105% of the height of the step surface 1038, the elastic force output to the piston ring 1034 is limited, and the elastic sealing effect cannot be optimized. On the other hand, the thickness difference should not be too high. If the thickness of the elastic sealing ring 1035 is more than 120% of the height of the step surface 1038, this may cause the elastic sealing ring 1035 to continuously receive a large extrusion force. This phenomenon may further cause the edge of the piston ring 1034 to not be well embedded in the annular groove, but reduce the sealing reliability. Moreover, under a large extrusion force for a long time, fatigue aging of the elastic sealing ring 1035 may be caused, and the service life is impaired. Therefore, the thickness difference between the two is preferably between 105% and 120%.

[0161] Optionally, as described above, the outer surface of the piston ring 1034 protrudes outwards by a short distance relative to the side of the piston body 1033. The protruding size range is preferably 0.05mm to 0.25mm. If the size of the piston ring 1034 protruding outwards relative to the piston body 1033 is too large, this may cause the piston movement stability of the floating piston 1031 as a whole in the shock absorber cylinder 3 to decrease, and it is easy to tilt and dislocate, affecting the movement performance of the shock absorber and other devices to which it is applied. On the other hand, the above-mentioned protruding size is not easy to be too small, otherwise the sealing performance cannot be further improved. On the other hand, the piston body 1033 may form a rigid friction contact with the inner wall of the shock absorber cylinder 3. If this rigid friction contact occurs for a long time, it will affect the service life of the floating piston 1031 to a certain extent.

[0162] The technical solution also provides a shock absorber, which includes a shock absorber cylinder 3 and the above-mentioned floating piston 1031. Figure 8 and Fig.11 As shown, the floating piston 1031 is arranged in the shock absorber cylinder 3, the piston body 1033 and the shock absorber cylinder 3 are in a coaxial relative position, and the outer surface of the piston ring 1034 is interference fit with the inner wall of the shock absorber cylinder 3. The floating piston 1031 can float up and down in the shock absorber cylinder 3 to realize the function of piston movement. When the shock absorber receives an impact, the floating piston moves up and down to absorb the impact and realize the vibration reduction effect.

[0163] According to another embodiment of the present application, a suspension system is provided. The suspension system includes the shock absorber described in the embodiment of the present application.

[0164] According to another embodiment of the present application, a vehicle is provided. The vehicle includes the suspension system described in the embodiment of the present application.

[0165] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0166] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A shock absorber, characterized in that: include: A shock absorber cylinder (3), wherein the shock absorber cylinder (3) has a first space (8) and a second space (9); a piston valve (4), the piston valve (4) being slidably arranged along the first space (8) and dividing the first space (8) into a first chamber (801) and a second chamber (802), the first chamber (801) being in communication with the second space (9); a first damping valve (21), the first damping valve (21) comprising a first inlet (211) and a first outlet (212), the first inlet (211) being in one-way communication with the first outlet (212), the first inlet (211) being in communication with the second chamber (802), the first outlet (212) being in communication with the second space (9), the first damping valve (21) being used to control the damping magnitude of the communication between the second chamber (802) and the second space (9); a second damping valve (22), the second damping valve (22) comprising a second inlet (221) and a second outlet (222), the second inlet (221) and the second outlet (222) being in one-way communication, the second inlet (221) being in communication with the second space (9), the second outlet (222) being in communication with the second chamber (802), the second damping valve (22) being used to control the damping magnitude of the communication between the second space (9) and the second chamber (802); A compression module (103), wherein the compression module (103) divides the second chamber (802) into a first sub-chamber (109) and a second sub-chamber (110), wherein the second sub-chamber (110) is used to store gas, so that the second sub-chamber (110) can be compressed or expanded as the pressure of the first sub-chamber (109) changes.

2. The shock absorber according to claim 1, characterized in that: The compression module (103) is a floating piston (1031) movably arranged in the second chamber (802), and the floating piston (1031) divides the second chamber (802) into a first sub-chamber (109) and a second sub-chamber (110). When the pressure in the first sub-chamber (109) is greater than the pressure in the second sub-chamber (110), the floating piston (1031) is configured to be able to move to compress the second sub-chamber (110).

3. The shock absorber according to claim 2, characterized in that: The floating piston (1031) comprises: A piston body (1033), wherein a side surface of the piston body (1033) is formed with an annular groove, wherein the annular groove has a first groove bottom (1037) and a second groove bottom (1036), wherein the second groove bottom (1036) is located in the first groove bottom (1037), and along the radial direction of the piston body (1033), the depth of the second groove bottom (1036) is greater than the depth of the first groove bottom (1037) so that a step surface (1038) is formed between the second groove bottom (1036) and the first groove bottom (1037); An elastic sealing ring (1035), wherein the elastic sealing ring (1035) is embedded in a groove formed by the step surface (1038) and the second groove bottom (1036); A piston ring (1034), wherein the piston ring (1034) is sleeved in the annular groove, and the inner surface of the piston ring (1034) is interference-fitted with the first groove bottom (1037) and the elastic sealing ring (1035).

4. The vibration absorber according to claim 3, characterized in that: The thickness of the elastic sealing ring (1035) is greater than the height of the step surface (1038) between the second groove bottom (1036) and the first groove bottom (1037).

5. The shock absorber according to claim 3, characterized in that: Along the radial direction of the piston body (1033), the outer surface of the piston ring (1034) protrudes outward from the annular groove.

6. The shock absorber according to claim 3, characterized in that: An annular groove (1039) is formed at at least one side edge of the first groove bottom (1037) along the axial direction of the piston body (1033); The piston ring (1034) has a skirt (10341) corresponding to the annular groove (1039), and the skirt (10341) is embedded in the annular groove (1039).

7. The shock absorber according to claim 6, characterized in that Annular clamping grooves (1039) are formed on both side edges of the first groove bottom (1037).

8. The vibration absorber according to claim 6 or 7, characterized in that: The annular groove (1039) has an inclined wall surface, and the skirt (10341) has an inclined surface corresponding to the inclined wall surface.

9. The vibration absorber according to claim 3, characterized in that: The material of the piston ring (1034) is polytetrafluoroethylene.

10. The vibration absorber according to claim 3, characterized in that: Along the axial direction of the piston body (1033), the width of the elastic sealing ring (1035) is less than or equal to the width of the second groove bottom (1036).

11. The shock absorber according to claim 4, characterized in that The thickness of the elastic sealing ring (1035) is 105% to 120% of the height of the step surface (1038).

12. The vibration absorber according to claim 5, characterized in that The outer surface of the piston ring (1034) protrudes outward relative to the side of the piston body (1033) in a size range of 0.05 mm to 0.25 mm.

13. The shock absorber according to claim 1, characterized in that The second chamber (802) of the shock absorber cylinder (3) has a limiting structure, and the limiting structure is configured to limit the compression module (103) so as to limit the expansion of the second sub-chamber (110) when the pressure in the second sub-chamber (110) is greater than the pressure in the first sub-chamber (109).

14. The shock absorber according to claim 13, characterized in that Along the moving direction of the piston valve (4) in the shock absorber cylinder (3), the limiting structure is located on a side of the first inlet (211) and the second outlet (222) away from the piston valve (4).

15. The shock absorber according to claim 13, characterized in that The limiting structure is a limiting step (111) formed on the inner wall of the second chamber (802); When the pressure in the second sub-chamber (110) is greater than the pressure in the first sub-chamber (109), the compression module (103) can move to enlarge the second sub-chamber (110) and abut against the limiting step (111).

16. The shock absorber according to claim 1, characterized in that The second sub-chamber (110) of the shock absorber cylinder (3) is provided with a communication channel (102) for inflating the second sub-chamber (110).

17. The shock absorber according to claim 16, characterized in that The communication passage (102) has a one-way valve structure, so that the communication passage (102) forms a one-way conduction from the outside to the inside of the shock absorber cylinder (3).

18. The shock absorber according to claim 16, characterized in that The communication channel (102) has a switch control valve structure, and the switch control valve is used to control the opening and closing of the communication channel (102).

19. The vibration absorber according to claim 1, characterized in that The shock absorber cylinder (3) comprises an inner cylinder (31) and an outer cylinder (32) surrounding the inner cylinder (31); the first space (8) is a cylindrical cavity in the inner cylinder (31); and the second space (9) is a cylindrical cavity between the inner cylinder (31) and the outer cylinder (32); The inner cylinder body (301) is provided with an inner cavity hole (7), and the first chamber (801) is connected to the second space (9) through the inner cavity hole (7).

20. The vibration absorber according to claim 19, characterized in that The piston valve (4) comprises a piston valve (401), the piston valve (401) forms a sealed contact with the inner surface of the first space (8), and along the movement direction of the piston valve (4) in the shock absorber cylinder (3), the inner cavity hole (7) is located on the side of the piston valve (401) away from the second chamber (802).

21. The vibration absorber according to claim 19, characterized in that The inner cylinder body (301) is provided with a plurality of inner cavity holes (7) along the circumference surrounding the first space (8).

22. The vibration absorber according to claim 19, characterized in that A partition (105) is formed on the shock absorber cylinder body. Along the movement direction of the piston valve (4), the partition (105) is located at the end of the outer cylinder body (32) close to the second chamber (802). The partition (105) closes the end of the second space (9) to isolate the second chamber (802) from the second space (9).

23. The vibration absorber according to claim 19, characterized in that A guide assembly (5) is provided on the first end upper cover of the shock absorber cylinder body (3), a portion of the guide assembly (5) is embedded in the inner cylinder body (31), and another portion of the guide assembly (5) is embedded in the outer cylinder body (32), and the guide assembly (5) forms relative positioning for the inner cylinder body (31) and the outer cylinder body (32).

24. The vibration absorber according to claim 23, characterized in that An insertion hole is formed on the guide assembly (5); The shock absorber also includes a piston rod (402), and the piston valve (401) is arranged on the piston rod (402). The piston rod (402) extends from the insertion hole of the guide assembly (5) into the inner cylinder body (31). The piston valve (401) forms a sealed contact with the inner surface of the inner cylinder body (31) to divide the first space (8) into a first chamber (801) and a second chamber (802). The first chamber (801) and the inner cavity hole (7) are located on the side of the piston valve (401) close to the first end.

25. The vibration absorber according to claim 24, characterized in that The shock absorber comprises a limiting member (403), and the limiting member (403) is arranged on the piston rod (402); The piston valve (401) is movable between a first position and a second position in the shock absorber cylinder (3); when the piston valve (401) is located at the first position, the volume of the first chamber (801) is a first volume; when the piston valve (401) is located at the second position, the volume of the first chamber (801) is a second volume; the first volume is greater than the second volume.

26. The shock absorber according to claim 25, characterized in that When the piston valve (401) is located at the second position, the limiting member (403) abuts against the guide assembly (5) to limit the piston valve (4).

27. The vibration absorber according to claim 25, characterized in that When the piston valve (401) is located at the first position, the piston valve (401) abuts against the partition plate (105) to limit the position of the piston valve (4).

28. The vibration absorber according to claim 25, characterized in that The limiting member (403) is sleeved and fixed on the piston rod (402).

29. The vibration absorber according to claim 22, characterized in that A first oil outlet (104) communicating with the second space (9) is formed on the outer cylinder body (32), the first oil outlet (104) is butted with the first outlet (212), and the first oil outlet (104) includes a plurality of through holes; The shock absorber cylinder (3) is formed with a second oil outlet (106) communicating with the first sub-chamber (109); the second oil outlet (106) is butt-jointed with the second outlet (222); and the second oil outlet (106) includes a plurality of through holes.

30. The vibration absorber according to claim 29, characterized in that The plurality of through holes of the first oil outlet (104) are arranged in an arc shape; And / or, the multiple through holes of the second oil outlet (106) are arranged in an arc shape.

31. The vibration absorber according to claim 29, characterized in that The shock absorber cylinder (3) is formed with a first oil inlet (108) communicating with the first sub-chamber (109); the first oil inlet (108) is butted with the first inlet (211); the first oil inlet (108) and the first oil outlet (104) are distributed on both sides of the partition (105) in a position-corresponding manner; The outer cylinder body (32) is provided with a second oil inlet (107) connected to the second space (9); the second oil inlet (107) is connected to the second inlet (221); the second oil inlet (107) and the second oil outlet (106) are distributed on both sides of the partition (105) in a positionally corresponding manner.

32. The vibration absorber according to claim 1, characterized in that The compression module (103) is an airbag module (1032), which divides the second chamber (802) into a first sub-chamber (109) and a second sub-chamber (110). When the pressure in the first sub-chamber (109) is greater than the pressure in the second sub-chamber (110), the airbag module (1031) is configured to be able to generate deformation to compress the second sub-chamber (110).

33. A suspension system, characterized in that: Comprising a vibration absorber as claimed in any one of claims 1 to 32.

34. A vehicle, characterized in that: The vehicle is equipped with a suspension system as claimed in claim 33.

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