Self-balancing gas spring

Abstract

The self-balancing gas spring provided in the application comprises a cylinder, a piston rod and a piston. The piston rod is arranged at least partially in the cylinder and can move along the axial direction relative to the cylinder. The piston is arranged in the cylinder. The piston comprises a body part, a plurality of supporting parts and a plurality of guiding parts. The body part is sleeved on the piston rod and is in axial limiting connection with the piston rod. The supporting parts and the guiding parts are distributed in the body part in a circumferential direction. The guiding parts and the body part have a radial deformation space therebetween. When the guiding parts are in a first state, the end of the guiding parts away from the body part is in contact with the inner wall surface of the cylinder, and the radial gap is formed between the outer wall surface of the supporting parts and the inner wall surface of the cylinder. When the guiding parts are converted from the first state to a second state, the guiding parts are deformed towards the radial deformation space. When the guiding parts are in the second state, the outer wall surface of at least part of the supporting parts is in contact with the inner wall surface of the cylinder. In the application, the gas spring can automatically buffer the vibration received when vibrating, the force balance is established, the guiding is stable and the smoothness is good.

Description

Technical Field

[0001] This application relates to the field of gas spring technology, specifically to a self-balancing gas spring. Background Technology

[0002] A gas spring is a telescopic element that uses high-pressure inert gas as the energy storage medium. It includes a piston rod and a cylinder. The piston rod is located inside the cylinder and can move axially relative to the cylinder. A piston is connected to the piston rod inside the cylinder. The piston contacts the inner wall of the cylinder to guide the piston rod, ensuring it moves linearly within the cylinder without deviation, thus preventing shaking or uneven wear.

[0003] In the prior art, if the gap between the outer wall of the piston and the inner wall of the cylinder is too large, the piston's guiding ability cannot be guaranteed, and it is easy to collide with the cylinder during vibration, resulting in abnormal noise. If the outer wall of the piston and the inner wall of the cylinder are tightly fitted, and the fitting area is too large, it will lead to excessive frictional resistance between the piston and the cylinder, affecting the smooth extension and retraction of the piston rod relative to the cylinder. In the prior art, most pistons are cylindrical structures, that is, the outer diameter of the piston is the same, and the gap between the piston and the cylinder generally has the above-mentioned problems of being too large or too small.

[0004] Therefore, there is room for further improvement in the piston technology. Summary of the Invention

[0005] In view of the above-mentioned technical problems, such as the gap between the piston and cylinder of the gas spring being too large, resulting in loss of guiding effectiveness and easy collision causing abnormal noise, or the gap between the piston and cylinder being too small, resulting in excessive contact surface between the piston and cylinder and excessive frictional resistance, this application provides a self-balancing gas spring. The piston has a body part, a guide part, and a support part. There is a radial deformation space between the guide part and the body part. Under normal circumstances, only the guide part will be in contact with the cylinder. After the guide part is deformed by force, the support part will contact the cylinder. Since the guide part is elastically deformable, the gas spring has an elastic buffering effect when subjected to vibration, automatically buffering the vibration and establishing force balance. This ensures that the piston will not lose its guiding effectiveness and easily collide to cause abnormal noise due to excessive gap between the piston and cylinder, nor will the contact surface between the piston and cylinder be too large due to excessive gap, resulting in excessive frictional resistance. The self-balancing gas spring of this application has the characteristics of effective guidance, low noise, and high smoothness.

[0006] This application provides a self-balancing gas spring, comprising: Cylinder; The piston rod is at least partially disposed within the cylinder and is capable of axial movement relative to the cylinder. A piston is disposed inside the cylinder; the piston includes a body, multiple support parts and multiple guide parts, the body is sleeved on the piston rod and is axially limited and connected to the piston rod; The support portion and the guide portion are distributed circumferentially outside the body portion, and there is a radial deformation space between the guide portion and the body portion; When the guide is in the first state, the end of the guide away from the main body is in contact with the inner wall of the cylinder, and there is a radial gap between the outer wall of the support and the inner wall of the cylinder. When the guide portion changes from the first state to the second state, the guide portion deforms toward the radial deformation space; When the guide portion is in the second state, at least a portion of the outer wall surface of the support portion is in contact with the inner wall surface of the cylinder.

[0007] Compared with the prior art, the self-balancing gas spring of this application has a guide part and a support part outside its main body. The guide part and the support part are distributed circumferentially. There is a radial deformation space between the guide part and the main body, so that the guide part has a first state and a second state. In the normal state, when the guide part is in the first state, there is a gap between the support part and the cylinder. Only the guide part of the entire piston can fit against the inner wall of the cylinder. This can ensure the effective guidance of the piston and the cylinder, and also reduce the contact area between the piston and the cylinder, so that the frictional resistance between the piston and the cylinder is small, and the smoothness of the piston movement is guaranteed. When the gas spring is affected by vibration or off-center load, the guide part will deform towards the radial deformation space during the process of changing from the first state to the second state. The guide part has an elastic function. During its deformation, the guide part will gradually deform towards the radial deformation space. Under the elastic function of the guide part, the support part will gradually come into contact with the cylinder, and there will be no violent collision and abnormal noise. When the guide part is in the second state, the guide part has been squeezed and deformed, and at least part of the support part is in contact with the cylinder, thereby supporting the cylinder and increasing the contact area between the piston and the cylinder, ensuring the effective guidance of the piston. Therefore, in this application, with the cooperation of the guide part, the support part, and the radial deformation space, the gas spring has an elastic buffering effect when subjected to vibration, automatically buffering the vibration and establishing force balance. This ensures that the piston will not lose its guiding effectiveness due to excessive clearance with the cylinder and will not easily collide and produce abnormal noise, nor will the piston and cylinder have excessive contact surface due to excessive clearance, resulting in excessive frictional resistance. The self-balancing gas spring of this application has the characteristics of effective guidance, low noise, and high smoothness.

[0008] Preferably, there are at least two support arms, which are spaced apart along the outer periphery of the body portion; Each of the support arms is provided with at least one guide portion and at least one support portion; the outer diameter of the support portion is smaller than the outer diameter of the guide portion.

[0009] Preferred options also include: The first groove is located between the adjacent guide portion and the support portion, and is recessed radially toward the central axis of the piston; The second groove is located between two adjacent support portions and is recessed radially toward the central axis of the piston.

[0010] Preferably, the outer peripheral surface of the guide portion is a plane or an arc surface, and the outer peripheral surface of the support portion is a plane or an arc surface; The free end of the guide extends toward the adjacent support portion, and the radial thickness of the guide gradually decreases along the extending direction of the guide.

[0011] Preferred options also include: A sealing assembly is slidably sleeved on the piston along the axial direction; the outer wall surface of the sealing assembly is in sealing fit with the inner wall surface of the cylinder, and the sealing assembly is used to divide the cylinder into a first chamber and a second chamber. A fluid passage is provided on the piston and includes a sealing part and a communicating part; the sealing assembly cooperates with the sealing part to seal the first chamber and the second chamber, and the sealing assembly cooperates with the communicating part to conduct communication between the first chamber and the second chamber; An elastic element is disposed on the side of the sealing assembly away from the piston, and is capable of applying a force in a first direction to the sealing assembly; Wherein, the first direction is the extension direction of the piston rod.

[0012] Preferably, the connecting portion includes a first connecting portion and a second connecting portion, wherein the first connecting portion and the second connecting portion are respectively located on both sides of the axial direction of the sealing portion; The end of the first connecting portion away from the sealing portion is always in communication with the first chamber, and the end of the first connecting portion near the sealing portion has an opening on the radially outer side wall of the piston. The end of the second connecting portion away from the sealing portion is always in communication with the second chamber, and the end of the second connecting portion near the sealing portion has an opening on the radially outer side wall of the piston.

[0013] Preferably, the sealing assembly includes: A sealing element is axially floatingly sleeved on the piston and located on the side of the guide portion near the second chamber; A sealing cylinder, comprising a first cylindrical portion and a second cylindrical portion distributed axially; The first cylindrical portion is slidably sleeved on the piston, and the first cylindrical portion is located on the side of the seal away from the guide portion; The second cylindrical portion is located on the side of the first cylindrical portion away from the seal, and the inner diameter of the second cylindrical portion is smaller than the outer diameter of the piston.

[0014] Preferred options also include: The first flow channel is located between the first cylindrical section and the cylinder barrel, and is normally connected to the second chamber; The second flow channel is provided on the second cylindrical part and extends through the second cylindrical part parallel to the axial direction; the second flow channel is normally connected to the second chamber.

[0015] Preferred options also include: A limiting sleeve is fitted onto the piston rod and located on the side of the piston away from the first chamber; The first limiting seat is sleeved on the piston rod and located on the side of the piston closer to the first chamber; The second limiting seat is sleeved on the piston rod and located on the side of the limiting sleeve away from the piston; The elastic element is sleeved on the limiting sleeve, and the two ends of the elastic element in the axial direction interact with the sealing cylinder and the second limiting seat, respectively.

[0016] Preferred options also include: A guide sleeve is provided inside the cylinder and has a guide hole through which the piston rod passes; A sealing sleeve is provided between the guide sleeve and the piston; An oil guide sleeve is provided between the sealing sleeve and the piston to guide lubricating oil to the outer wall surface of the piston rod; A limiting part is provided on the inner wall surface of the cylinder, located between the oil guide sleeve and the piston, and is used to axially limit the piston and the oil guide sleeve. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of a self-balancing gas spring provided in an embodiment of this application.

[0018] Figure 2 This is a partial axial cross-sectional structural diagram of a self-balancing gas spring provided in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of a partial explosion structure of a self-balancing gas spring provided in an embodiment of this application.

[0020] Figure 4 yes Figure 2 A magnified view of part A.

[0021] Figure 5 This is a three-dimensional structural schematic diagram of a piston provided in an embodiment of this application.

[0022] Figure 6 This is a radial cross-sectional structural diagram of a self-balancing gas spring provided in an embodiment of this application.

[0023] Figure 7 yes Figure 2 A magnified schematic diagram of part B.

[0024] Figure 8 This is a three-dimensional structural schematic diagram of an oil guide diaphragm provided in an embodiment of this application.

[0025] Reference numerals: 1. Cylinder; 2. Piston rod; 3. Piston; 4. Elastic element; 5. Seal; 6. Sealing cylinder; 7. Limiting sleeve; 8. First limiting seat; 9. Second limiting seat; 10. Guide sleeve; 11. Sealing sleeve; 12. Oil guide diaphragm; 101. First chamber; 102. Second chamber; 103. Limiting part; 301. Body part; 302. Support arm; 303. Sealing part; 304. First connecting part; 305. Second connecting part; 3021. Support part; 3022. Guide part; 3023. Radial deformation space; 3024. First groove; 3025. Second groove; 601. First cylindrical section; 602. Second cylindrical section; 603. First flow channel; 604. Second flow channel; 1201. Main body; 1202. Lip; 1203. Oil receiving part; 1204. Oil guide groove; 1205. Oil inlet; 1206. Oil guide surface; 1207. Clamping block; 1208. Oil retaining ring. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0027] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0028] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0029] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 8 illustrate.

[0030] This application provides a self-balancing gas spring, such as Figures 1 to 3 As shown, it includes a cylinder 1, a piston rod 2, and a piston 3. The end of the cylinder 1 is provided with a guide sleeve 10, which has a guide hole for the piston rod 2 to pass through. One end of the piston rod 2 is inserted into the guide sleeve 10, and the other end is located outside the cylinder 1. The piston rod 2 is slidably connected to the guide sleeve 10, and the piston rod 2 can be axially displaced relative to the cylinder 1. The piston 3 is disposed inside the cylinder 1 and sleeved on the piston rod 2. The piston 3 is axially limited to the piston rod 2, that is, the piston 3 can follow the piston rod 2 and move axially. The piston 3 is provided with a sealing assembly, at least part of the outer wall surface of the sealing assembly is in contact with the inner wall surface of the cylinder 1 to divide the inner cavity of the cylinder 1 into a first chamber 101 and a second chamber 102. The first chamber 101 is the chamber closer to the guide sleeve 10, and the second chamber 102 is the chamber away from the guide sleeve 10.

[0031] Among them, such as Figures 4 to 6 As shown, the piston 3 includes a body portion 301 and support arms 302. The body portion 301 is generally cylindrical and is sleeved on the piston rod 2. The body portion 301 is axially limited and fixed relative to the piston rod 2. The maximum outer diameter of the body portion 301 is smaller than the inner diameter of the cylinder 1. There are at least two support arms 302, which are equidistantly distributed along the outer circumference of the body portion 301. The axial length of the support arms 302 is smaller than the axial length of the body portion 301. Wherein, as... Figure 5 , Figure 6As shown, the support arm 302 is provided with at least one guide portion 3022 and at least one support portion 3021. The guide portion 3022 and the support portion 3021 are arranged circumferentially on the support arm 302. The outer diameter of the guide portion 3022 is larger than the outer diameter of the support portion 3021. The outer diameter of the guide portion 3022 is equal to or larger than the inner diameter of the cylinder 1. On the same support arm 302, a first groove 3024 is provided between the guide portion 3022 and the support portion 3021. The first groove 3024 is recessed radially toward the central axis of the piston 3. The end of the guide portion 3022 near the body portion 301 has a radial gap with the body portion 301. This radial gap forms a radial deformation space 3023. With the cooperation of the radial deformation space 3023 and the first groove 3024, the guide portion 3022 presents a cantilever shape, so that the guide portion 3022 has a radial elastic deformation effect.

[0032] In practical use, the guide part 3022 has at least two states; in the first state, the end of the guide part 3022 away from the main body 301 is in contact with the inner wall surface of the cylinder 1, and there is a radial gap between the outer wall surface of the support part 3021 and the inner wall surface of the cylinder 1. That is, only the guide part 3022 of the entire piston 3 is in contact with the cylinder 1. Therefore, the contact area between the piston 3 and the cylinder 1 is small, which can ensure the effective guidance of the piston 3 and the cylinder 1 and avoid the collision between the piston 3 and the cylinder 1 when the self-balancing gas spring is vibrated, thus preventing abnormal noise. When the gas spring is affected by vibration or off-center load, during the process of the guide part 3022 changing from the first state to the second state, the guide part 3022 will deform toward the radial deformation space 3023. The guide part 3022 is elastic. During its deformation, the guide part 3022 will gradually deform toward the radial deformation space 3023. Under the elastic action of the guide part 3022, the support part 3021 will gradually come into contact with the cylinder 1. The contact process is a flexible contact, and there will be no violent collision that would produce abnormal noise. When the guide part 3022 is in the second state, the guide part 3022 has been compressed and deformed, and at least part of the support part 3021 is in contact with the cylinder 1, thereby supporting the cylinder 1. This increases the contact area between the piston 3 and the cylinder 1, ensuring the effective guidance of the piston 3. The guide part 3022 has elasticity. When the off-center load or vibration disappears, the guide part 3022 can automatically return to the first state. During the return process, the guide part 3022 slowly deforms outward so that the support part 3021 gradually disengages from the cylinder 1. The piston 3 returns to a state where only the guide part 3022 is in contact with the cylinder 1, preventing the piston 3 from jamming. The whole process is a flexible contact, and the support arm 302 has the effect of absorbing vibration and buffering, avoiding rigid collisions and improving the service life of the gas spring.

[0033] Therefore, in this application, with the cooperation of the guide part 3022, the support part 3021, and the radial deformation space 3023, the self-balancing gas spring has an elastic buffering effect when subjected to vibration, and can automatically buffer the vibration and establish force balance. This ensures that the piston 3 will not lose its guiding effectiveness due to excessive gap with the cylinder 1, and will not easily collide and produce abnormal noise. At the same time, the piston 3 will not have excessive frictional resistance due to excessive gap with the cylinder 1. The self-balancing gas spring of this application has the characteristics of effective guidance, low noise, high smoothness, and automatic buffering to establish balance.

[0034] In this application, as Figure 5 , Figure 6 As shown, five support arms 302 are provided, and the five support arms 302 are equidistantly spaced along the outer periphery of the body 301. Each support arm 302 has a guide portion 3022 and two support portions 3021, thereby giving the piston 3 five guide portions 3022 and ten support portions 3021. On the same support arm 302, there is a first groove 3024 between adjacent guide portions 3022 and support portions 3021, and a second groove 3025 between two adjacent support portions 3021. The two grooves 3025 are recessed radially toward the central axis of the piston 3. The first groove 3024 and the second groove 3025 are parallel to the axial direction and pass through the support arm 302, so that the working medium can flow through the first groove 3024 and the second groove 3025, so as to have the effects of guiding, noise reduction and buffering. Moreover, the circumferential length of the first groove 3024 is greater than the circumferential length of the second groove 3025, so that the contact area between the guide part 3022, the support part 3021 and the cylinder 1 is smaller, thereby reducing frictional resistance.

[0035] In an optional embodiment of this application, the free end of the guide portion 3022 extends toward the adjacent support arm 302. Along the extension direction of the guide portion 3022, the radial thickness of the guide portion 3022 gradually decreases, thereby making the guide portion 3022 pawl-shaped, so as to have a better elastic deformation effect and reduce the contact area between the guide portion 3022 and the cylinder 1, thereby reducing frictional resistance.

[0036] In an optional embodiment of this application, the outer peripheral surfaces of the guide portion 3022 and the support portion 3021 are planar or arc-shaped, thereby making the contact between the guide portion 3022 and the support portion 3021 and the inner wall surface of the cylinder 1 a line contact or a surface contact. This ensures stable contact and guidance between the piston 3 and the cylinder 1, while also reducing the frictional resistance between the piston 3 and the cylinder 1, and ensuring the smoothness of the piston 3's displacement relative to the cylinder 1.

[0037] It should be noted that in this application, the piston 3 is made of plastic material, the outer diameter of the guide portion 3022 is preferably larger than the inner diameter of the cylinder 1, and the difference between the outer diameter of the guide portion 3022 and the outer diameter of the support portion 3021 is less than or equal to the difference between the outer diameter of the guide portion 3022 and the inner diameter of the cylinder 1. Figure 6 As shown, when the self-balancing gas spring is subjected to vibration, for example, when the piston 3 deforms downward, the support arm 302 of the lower half of the piston 3 is squeezed by the cylinder 1, and the guide portion 3022 on the support arm 302 of the lower half deforms towards the radial deformation space 3023 above, and the support portion 3021 of the lower half contacts the cylinder 1; while the guide portion 3022 on the support arm 302 of the upper half pops upward, and the support portion 3021 on the support arm 302 of the upper half does not contact the inner wall surface of the cylinder 1; therefore, when the self-balancing gas spring of this application is subjected to vibration, not all of the support portions 3021 on the piston 3 may contact the inner wall surface of the cylinder 1, but at least some of the support portions 3021 will contact the cylinder 1, thereby further improving the elastic buffering and shock absorption effect of the piston 3, so as to improve the self-balancing effect of the piston 3.

[0038] It should be noted that in this application, the axial direction is based on the axis of cylinder 1.

[0039] Based on any of the above embodiments, the self-balancing gas spring can be further extended; such as... Figures 2 to 4 As shown, the self-balancing gas spring also includes an elastic element 4, which is located on the side of the sealing assembly away from the guide sleeve 10. The elastic element 4 can apply a force to the sealing assembly in a first direction, which is the extension direction of the piston rod 2. The piston 3 is provided with a fluid channel, and the sealing assembly can be displaced axially to change the opening and closing of the fluid channel. The first chamber 101 and the second chamber 102 are connected through the fluid channel. Therefore, the sealing state of the fluid channel determines the communication state between the first chamber 101 and the second chamber 102. When the fluid channel is sealed, the first chamber 101 and the second chamber 102 are not connected; when the fluid channel is not sealed, the first chamber 101 and the second chamber 102 are connected.

[0040] In this application, during the extension or retraction of the piston rod 2, when the piston rod 2 is displaced axially outward under the action of an external force, the volume of the first chamber 101 and the second chamber 102 is changed, thereby breaking the initial balance between the first chamber 101 and the second chamber 102 and changing the pressure difference between the first chamber 101 and the second chamber 102. Under the action of the pressure difference, the sealing assembly is displaced so that the first chamber 101 and the second chamber 102 are connected. When the external force is removed, the pressure difference, the sealing assembly, and the elastic element 4... Under the combined action, the sealing assembly will be reset again so that the first chamber 101 and the second chamber 102 are not connected. Under the pressure difference between the first chamber 101 and the second chamber 102 on the piston rod 2, the piston rod 2 will move a little length to eliminate the pressure difference, and the balance between the first chamber 101 and the second chamber 102 in the cylinder 1 will be re-established, so that the piston rod 2 will no longer move, and thus the piston rod 2 will be able to hover in the cylinder 1 without the need for external force or additional locking action, so that the piston rod 2 has the effect of self-balancing and arbitrary hovering.

[0041] Specifically, such as Figures 2 to 4 As shown, the fluid channel includes a sealing portion 303 and a connecting portion; the sealing assembly includes a sealing element 5, the outer periphery of which is always in contact with the cylinder 1 to achieve a seal; the outer diameter of the sealing portion 303 is slightly larger than the inner diameter of the sealing element 5, and when the sealing element 5 slides axially onto the sealing portion 303, the sealing element 5 cooperates with the sealing portion 303 to seal the first chamber 101 and the second chamber 102; at least a portion of the outer diameter of the connecting portion is smaller than the inner diameter of the sealing element 5, and when the sealing element 5 slides axially onto the connecting portion, the sealing element 5 cooperates with the connecting portion to connect the first chamber 101 and the second chamber 102; wherein, the connecting portion includes a first connecting portion 304 and a second connecting portion 305, the first connecting portion 304 and the second connecting portion 305 being located on the axis of the sealing portion 303 respectively. On both sides, the first connecting part 304 is a groove structure or a channel structure. It is only necessary to ensure that the end of the first connecting part 304 away from the sealing part 303 is open at the axial end of the body part 301 of the piston 3, so as to ensure that the first connecting part 304 is always in communication with the first chamber 101. The end of the first connecting part 304 near the sealing part 303 is opened on the radial outer side wall of the piston 3. The second connecting part 305 is a groove structure or a channel structure. The end of the second connecting part 305 away from the sealing part 303 is open at the other axial end of the body part 301, so that the second connecting part 305 is always in communication with the second chamber 102. The end of the second connecting part 305 near the sealing part 303 is opened on the radial outer side wall of the piston 3.

[0042] In this application, the fluid channel is composed of a first connecting portion 304, a second connecting portion 305, and a sealing portion 303 between the first connecting portion 304 and the second connecting portion 305.

[0043] It should be noted that in this application, the sealing element 5 has a ring-shaped structure, and the blockage of the fluid channel achieved by the sealing element 5 and the sealing part 303 means that, as Figure 4 As shown, in the axial section, the seal 5 has a circular cross-section with a center point. In the radial direction passing through the center point, when the inner side of the seal 5 is located on the sealing part 303 or just on the boundary line between the sealing part 303 and the conducting area, the fluid passage is blocked, thus blocking the first chamber 101 and the second chamber 102. In the fluid passage, except in the case where the seal 5 is located on the sealing part 303, the seal 5 cooperates with the connecting part to achieve the connection of the fluid passage, so that the first chamber 101 and the second chamber 102 are connected.

[0044] In this application, as Figure 4 , Figure 5 As shown, the first connecting portion 304 is preferably a groove structure, and the second connecting portion 305 is preferably a groove structure. The second connecting portion 305 and the first connecting portion 304 are spaced apart along the first direction, and their length extension directions are parallel. The spaced area between the first connecting portion 304 and the second connecting portion 305 forms a sealing portion 303. When the sealing member 5 is displaced onto the sealing portion 303, the first connecting portion 304 and the second connecting portion 305 are sealed, the fluid channel is sealed, and the first chamber 101 and the second chamber 102 are not connected to each other. When the sealing member 5 is displaced axially onto the first connecting portion 304 or the second connecting portion 305, the first connecting portion 304 and the second connecting portion 305 are connected, the fluid channel is connected, and the first chamber 101 and the second chamber 102 are connected.

[0045] Furthermore, the sealing assembly also includes a sealing cylinder 6, such as Figure 2 , Figure 4As shown, the sealing cylinder 6 is slidably sleeved on the end of the body 301 away from the support arm 302. The sealing cylinder 6, the sealing element 5, and the support arm 302 are distributed sequentially along the first direction. The sealing cylinder 6 includes a first cylindrical portion 601 and a second cylindrical portion 602 axially distributed. The first cylindrical portion 601 and the second cylindrical portion 602 are coaxially arranged. The first cylindrical portion 601 is located near the first chamber 101, and the second cylindrical portion 602 is located near the second chamber 102. The first cylindrical portion 601 is slidably sleeved on the piston 3. The first cylindrical portion 601 is located on the side of the sealing element 5 away from the support arm 302. The second cylindrical portion 602 is located on the side of the first cylindrical portion 601 away from the sealing element. On one side of 5, the inner diameter of the second cylindrical portion 602 is smaller than the outer diameter of the main body portion 301, so that the second cylindrical portion 602 can at least partially form an axial limit with the axial end face of the main body portion 301; wherein, the outer diameter of the first cylindrical portion 601 is smaller than the inner diameter of the cylinder 1, so that a first flow channel 603 is formed between the first cylindrical portion 601 and the cylinder 1, and the first flow channel 603 is normally connected to the second chamber 102; the second cylindrical portion 602 is provided with a second flow channel 604, the second flow channel 604 is parallel to the axial direction and passes through the second cylindrical portion 602, and the two axial ends of the second flow channel 604 are normally connected to the second connecting portion 305 and the second chamber 102, respectively; Figure 4 As shown, the outer diameter of the second flow channel 604 is larger than the outer diameter of the second connecting portion 305, and the inner diameter of the second flow channel 604 is approximately the same as the inner diameter of the second connecting portion 305, so that when the working medium flowing from the second chamber 102 to the first chamber 101 passes through the second flow channel 604, it can at least partially act on the first cylinder portion 601 to apply an axial force to the first cylinder portion 601, ensuring that the second cylinder portion 602 always abuts against the body portion 301, thereby ensuring the stability of the sealing cylinder 6.

[0046] The second flow channel 604 is configured as multiple channels, and the multiple channels 604 are arranged at equal intervals around the second cylinder 602 in the circumferential direction.

[0047] Preferred, such as Figure 4 As shown, the outer periphery of the sealing cylinder 6 is provided with multiple grooves, which are recessed radially toward the center of the sealing cylinder 6. The multiple grooves are distributed at intervals along the circumference of the sealing cylinder 6. Among them, each second flow channel 604 is provided with a corresponding groove on its outer periphery. Along the circumference, the circumferential length of the groove is greater than the circumferential length of the second flow channel 604. The groove is connected to the outer side of the second flow channel 604, so that the second flow channel 604 is connected to the first flow channel 603 radially, which can increase the flow velocity of the working medium.

[0048] In this application, the sealing element 5 is located between the support arm 302 and the sealing cylinder 6. The sealing cylinder 6 and the support arm 302 together limit the axial ends of the sealing element 5. When the second cylindrical part 602 of the sealing cylinder 6 abuts against the main body part 301, the axial distance between the sealing cylinder 6 and the support arm 302 forms the working stroke of the sealing element 5, wherein the axial length of the working stroke is L1 and the axial thickness of the sealing element 5 is L2. The sealing part 303 is located within the working stroke, and the axial length of the sealing part 303 is L3, wherein L1>L2 and L1>L3. This ensures that the sealing ring can be displaced to the sealing part 303 to seal the fluid channel within the working stroke, or it can be displaced to the first connecting part 304 to open the fluid channel.

[0049] When the second cylindrical portion 602 abuts against the body portion 301 under the action of the elastic member 4, the distance between the end of the sealing portion 303 near the first cylindrical portion 601 and the first cylindrical portion 601 is greater than or equal to 1 / 2 of L2. This allows the sealing member 5 to be located on the sealing portion 303 to seal the fluid passage when the sealing member 5 abuts against the first cylindrical portion 601 and the second cylindrical portion 602 abuts against the body portion 301.

[0050] Furthermore, such as Figures 2 to 4 As shown, the self-balancing gas spring also includes a limiting sleeve 7, a first limiting seat 8, and a second limiting seat 9. The limiting sleeve 7 is sleeved on the piston rod 2 and is located on the side of the body 301 away from the support arm 302. The elastic element 4 and the second cylinder 602 are sleeved on the limiting sleeve 7. The first limiting seat 8 is sleeved on the piston rod 2 and is located on the side of the body 301 near the first chamber 101. The first limiting seat 8 is used to axially limit the end of the body 301 near the support arm 302. The piston rod 2 is provided with a limiting step, the outer diameter of which is larger than the inner diameter of the first limiting seat 8. The limiting step is used to axially limit the first limiting seat 8. The second limiting seat 9 is sleeved on the piston rod 2 and is located on the side of the limiting sleeve 7 away from the piston 3. The second limiting seat 9 is axially limited to the piston rod 2. The two ends of the elastic element 4 interact with the sealing cylinder 6 and the second limiting seat 9, respectively.

[0051] Among them, such as Figure 4 As shown, the limiting sleeve 7 is provided with a limiting cylinder portion. The outer diameter of the limiting cylinder portion is larger than the inner diameter of the second cylinder portion 602. The limiting cylinder portion is located on the side of the limiting sleeve 7 close to the second limiting seat 9. The limiting cylinder portion can limit the axial displacement of the sealing cylinder 6 and play a braking role, which can prevent the sealing cylinder 6 from excessively squeezing the elastic element 4 or the sealing element 5 from falling off the body portion 301. The length of the axial displacement of the sealing cylinder 6 formed between the limiting cylinder portion and the body portion 301 is greater than the length of the sealing portion 303, thereby ensuring that the sealing element 5 can smoothly release the seal on the second connecting portion 305 after being pushed to move in the opposite direction to the first direction.

[0052] In this application, the elastic member 4 is a columnar spring.

[0053] Among them, as Figures 2 to 4 shown, the first limiting seat 8 is provided with a first fluid passage opening which penetrates the first limiting seat 8 parallel to the axial direction. The first fluid passage opening is provided in plurality and is equidistantly spaced along the same circumference. The first fluid passage opening is used for the fluid to pass through quickly; the second limiting seat 9 is provided with a second fluid passage opening which penetrates the second limiting seat 9 parallel to the axial direction. The second fluid passage opening is provided in plurality and is equidistantly spaced along the same circumference. The second fluid passage opening is used for the fluid to pass through quickly.

[0054] In this embodiment, both the first connecting portion 304 and the second connecting portion 305 are provided in plurality, and the first connecting portion 304 and the second connecting portion 305 are both equidistantly spaced around the outer circumference of the piston 3. The radial depth and / or circumferential length of the first connecting portion 304 is greater than the corresponding dimension of the second connecting portion 305, so that when the piston rod 2 extends out, a larger damping is formed to prevent the piston rod 2 from catapulting, and the uniform flow effect can be improved, avoiding the impact of the piston 3 and the cylinder barrel 1 caused by uneven flow, and avoiding affecting the telescopic movement of the piston rod 2.

[0055] Assume: The effective area of the first chamber 101 is S1, the pressure of the first chamber 101 is P1, and the pressure of the gas in the first chamber 101 on the piston 3 is F1; The effective area of the second chamber 102 is S2, the pressure of the second chamber 102 is P2, and the pressure of the gas in the second chamber 102 on the piston 3 is F2; When F1 = F2, the piston rod 2 hovers; where, F1 = P1 * S1, F2 = P2 * S2, S1 is approximately the difference between the radial cross-sectional area of the inner cavity of the cylinder barrel 1 and the radial cross-sectional area of the piston rod 2, S2 is approximately the radial cross-sectional area of the inner cavity of the cylinder barrel 1, so S1 < S2; The elastic force of the elastic member 4 is Fk, the effective area of the seal 5 is S3, and the external force applied to the piston rod 2 is F, and S3 is the radial cross-sectional area of the seal 5.

[0056] When the self-balancing gas spring is in the initial state, the self-balancing gas spring is in a balanced state, and the piston 3 stops in the cylinder barrel 1. At this time, F1 = F2, that is, P1 * S1 = P2 * S2. Since S1 < S2, therefore P1 > P2; Since P1 * S3 > P2 * S3, the seal 5 fits with the first cylinder portion 601 of the seal cylinder 6, the seal 5 is located on the sealing portion 303, the fluid passage is sealed by the seal 5, and the first chamber 101 and the second chamber 102 are in a blocked state; in the initial state, P1 = P10, P2 = P20, and P10 > P20.

[0057] During the retraction process of the gas spring, the establishment of the self-balanced state after the external force is withdrawn and the process of achieving the hovering of the piston rod 2 in the cylinder 1 are as follows: In the first stage, an external force F pushes the piston rod 2 to retract inward. Since F + F1 > F2, the piston rod 2 is pushed inward to break the initial balance of the gas spring. Because P10 > P20 and P10*S3 > P20*S3, the seal 5 remains in contact with the first cylinder part 601, and the first chamber 101 is not connected to the second chamber 102. However, under the action of the external force F, the volume of the first chamber 101 increases, P10 decreases to P11, the second chamber 102 is compressed, P20 increases to P21, P11 < P10, P21 > P20, and P11 > P21; In the second stage, with the continuous action of the external force, the piston rod 2 continues to compress into the cylinder 1. The first chamber 101 continues to expand, and the second chamber 102 continues to be compressed. At this time, P11 decreases to P12, and P21 increases to P22 until P12 < P22, so that P12*S3 < P22*S3, causing the seal 5 to be pushed by the gas in the second chamber 102 to displace in the direction of the first chamber 101. The seal 5 moves out of the sealing part 303, and the seal 5 releases the seal of the fluid passage. The first chamber 101 is connected to the second chamber 102, and the fluid in the second chamber 102 flows from the first flow path 603 to the first connecting part 304, and then from the first connecting part 304 to the first chamber 101. The fluid path can be referred to Figure 4 [[ID=?]]as shown by the dotted path a in ; In the third stage, with the continuous action of the external force, the piston rod 2 continues to retract. The first chamber 101 and the second chamber 102 continue to be connected. Although the fluid in the second chamber 102 flows into the first chamber 101, the second chamber 102 continues to be compressed, and the first chamber 101 continues to be expanded. Moreover, since the fluid passage is small, the pressures of the first chamber 101 and the second chamber 102 do not change relative to the second stage. At this time, P12 is converted to P13, and P22 is converted to P23, where P13 ≈ P12, P23 ≈ P22, and P13 < P23; In the fourth stage, at the moment when the external force is withdrawn, because P13 < P23, P23*S3 > P13*S3, the seal 5 continues to be located on the left side of the support arm 302, and the first chamber 101 and the second chamber 102 continue to be connected. And because P23*S2 > P13*S1, that is, F2 > F1, the piston rod 2 is pushed to displace in the direction of the first chamber 101. The first chamber 101 is compressed, and the second chamber 102 expands. P13 increases to P14, and P23 decreases to P24. At this time, P14 < P24; It should be noted that there seems to be a formatting issue in the original text where the reference in step 5 is incomplete. I've tried to translate it as accurately as possible based on the available content.In the fifth stage, the piston rod 2 continues to displace a certain length towards the direction of the first chamber 101. At this time, P14 increases to P15, and P24 decreases to P25 until P15 is slightly greater than P25. Since P15*S3 > P25*S3, the seal 5 is reset onto the sealing portion 303 under the push of the gas pressure in the first chamber 101. The seal 5 seals the fluid passage, and the first chamber 101 is not connected to the second chamber 102. Although P15 > P25, S1 < S2, so P15*S1 < P25*S2, that is, F1 < F2, and the piston rod 2 will continue to displace towards the first chamber 101. In the sixth stage, the piston rod 2 continues to displace a certain length towards the first chamber 101. P15 increases to P16, and P25 decreases to P26. At this time, P16 > P26 until P16*S1 = P26*S2, that is, F1 = F2. At this time, the forces exerted by the gases in the first chamber 101 and the second chamber 102 on the piston 3 are equal, and the piston rod 2 hovers.

[0058] During the extension process of the gas spring, the establishment of the self - balancing state after the external force is withdrawn and the process of the piston rod 2 hovering in the cylinder 1 are as follows: In the first stage, an external force F pulls the piston rod 2 outwards. F + F2 > F1, and the piston rod 2 is pulled outwards to break the initial balance of the gas spring. Since P10 > P20, the seal 5 is located on the sealing portion 303, the fluid passage is sealed, the elastic member 4 is not compressed, and the first chamber 101 is not connected to the second chamber 102. However, under the action of the external force F, the volume of the first chamber 101 is compressed, P10 increases to P11, the second chamber 102 is expanded, and P20 decreases to P21. At this time, P11 > P10 and P21 > P20. In the second stage, with the continuous action of the external force, the piston rod 2 continues to extend out of the cylinder 1. The first chamber 101 continues to shrink, and the second chamber 102 continues to expand. At this time, P11 increases to P12, and P21 decreases to P22 until P12*S3 > P22*S3 + Fk. The gas in the first chamber 101 overcomes the acting force of the elastic member 4 to push the seal 5 and the seal cylinder 6 to displace towards the second chamber 102. The elastic member 4 is compressed, the seal 5 abuts against the first cylinder portion 601, the seal 5 releases the seal of the fluid passage, the first chamber 101 is connected to the second chamber 102, and the fluid in the first chamber 101 flows from the first communication portion 304 to the second communication portion 305, and then from the second communication portion 305 to the second flow path 604 and the second chamber 102. The fluid path can be referred to as Figure 4 shown by the solid - line path b in In the third stage, the external force continues to act, the piston rod 2 continues to retract, the elastic member 4 remains in a compressed state, the first chamber 101 and the second chamber 102 continue to communicate. Although the fluid in the second chamber 102 flows into the first chamber 101, the second chamber 102 continues to be compressed, the first chamber 101 continues to expand, and the fluid passage is small. Therefore, the pressures of the first chamber 101 and the second chamber 102 do not change relative to the second stage. At this time, P12 is converted to P13, and P22 is converted to P23, where P13≈P12, P23≈P22, and P13>P23; In the fourth stage, at the moment when the external force is withdrawn, due to P13>P23, the elastic member 4 remains in a compressed state, the seal 5 continues to abut against the first cylindrical portion 601, and the first chamber 101 and the second chamber 102 continue to communicate; and because P13>P12>P11>P10, P23<P22<P21<P10, so P13*S1>P23*S2, that is, F1>F2. The piston rod 2 is pushed to displace in the direction of the second chamber 102. The second chamber 102 is compressed, the first chamber 101 expands, P13 decreases to P14, and P23 increases to P24, but P14>P24; In the fifth stage, the piston rod 2 continues to displace a certain length in the direction of the second chamber 102. The first chamber 101 continues to expand, and the second chamber 102 continues to be compressed. At this time, P14 decreases to P15, and P24 increases to P25, where P15<P14, P24<P25, until P15*S3<P25*S3+Fk. Under the action of the elastic member 4, the seal 5 displaces in the direction of the first chamber 101. The seal 5 is located on the sealing portion 303, and the flow passage is sealed. The first chamber 101 and the second chamber 102 are not connected; although P15<P14, but P15>P10, so P15*S1>P25*S2, that is, F1>F2, and the piston rod 2 will continue to displace in the direction of the second chamber 102; In the sixth stage, the piston rod 2 continues to displace a certain length in the direction of the second chamber 102. The first chamber 101 continues to expand, and the second chamber 102 continues to be compressed. P15 decreases to P16, and P25 increases to P26, until P16>P26, P16*S1=P26*S2, that is, F1=F2. At this time, the forces exerted by the gases in the first chamber 101 and the second chamber 102 on the piston 3 are equal, and the piston rod 2 hovers.

[0059] From the above content of the retraction and extension process of the piston rod 2, it can be seen that the self-balancing gas spring of the present application can automatically establish balance after the external force is withdrawn. With the combined action of the throttling effect of the fluid passage and the elastic member 4, it can also achieve automatic locking during the retraction and extension of the gas spring without external force interference, making the self-balancing gas spring of the present application have a two-way locking function.

[0060] Based on any of the above embodiments, the self-balancing gas spring can be further extended; such as... Figure 7 , Figure 8 As shown, the self-balancing gas spring also includes a sealing sleeve 11 and an oil guide sleeve 12. The sealing sleeve 11 and the oil guide sleeve 12 are both located inside the cylinder 1 and are both fitted onto the piston rod 2. The sealing sleeve 11 is located on the side of the guide sleeve 10 near the piston 3, and the oil guide sleeve 12 is located between the sealing sleeve 11 and the piston 3. A limiting part 103 is provided on the cylinder 1. The limiting part 103 is located on the inner wall surface of the cylinder 1 and protrudes radially toward the center of the cylinder 1. The oil guide sleeve 12 is located between the sealing sleeve 11 and the limiting part 103. On the same radial plane, the projections of the oil guide sleeve 12 and the limiting part 103 at least partially overlap. The limiting part 103 and the guide sleeve 10 work together to achieve axial limiting of the oil guide sleeve 12 and the sealing sleeve 11, so that the oil guide sleeve 12 will not move out of the axial space formed by the limiting part 103 and the guide sleeve 10. The sealing sleeve 11 has an L-shaped axial section, which prevents oil in the cylinder 1 from leaking from the guide sleeve 10.

[0061] Specifically, such as Figure 7 As shown, the oil guide sleeve 12 includes a main body 1201 and a lip 1202. The main body 1201 has a cylindrical structure, and at least a portion of the inner wall surface of the main body 1201 has a radial gap with the outer wall surface of the piston rod 2. The lip 1202 has an annular structure, with one side connected to the main body 1201 and the other side extending toward the piston rod 2, and at least a portion of its inner wall surface fitting against the outer wall surface of the piston rod 2. This allows the inner wall surface of the main body 1201, the inner wall surface of the lip 1202, and the outer wall surface of the piston rod 2 to cooperate to form an oil receiving portion 1203. The oil receiving portion 1203 and the first... The chamber 101 is connected, allowing the oil in the inner cavity of the cylinder 1 to enter the oil container 1203 and contact the piston rod 2. On the one hand, the oil container 1203 can concentrate the oil and contact the piston rod 2. On the other hand, the oil container 1203 can temporarily hold the oil to prolong the contact time between the oil and the piston rod 2, so that the piston rod 2 can fully contact the lubricating oil and form a sufficient oil film on the piston rod 2, realizing the self-lubricating effect of the gas spring. This reduces the frictional resistance between the piston rod 2 and the guide sleeve 10, thereby reducing the probability of abnormal noise when the piston rod 2 moves axially relative to the cylinder 1, and enabling the gas spring to operate quietly.

[0062] The outer wall of the lip portion 1202 is connected to the radial inner wall of the main body portion 1201, or the lip portion 1202 is connected to the axial end of the main body portion 1201.

[0063] In this embodiment, the contact between the lip portion 1202 and the piston rod 2 can be either line contact or surface contact. The lip portion 1202 and the main body portion 1201 can be integrally formed or separately connected; wherein, the oil guide sleeve 12 is made entirely of elastic rubber or plastic material.

[0064] like Figure 7 , Figure 8 As shown, the outer periphery of the main body 1201 is provided with at least one oil guide groove 1204, which extends parallel to the axial direction through the main body 1201. The main body 1201 is also provided with an oil inlet 1205. One end of the oil inlet 1205 communicates with the oil guide groove 1204, and the other end communicates with the oil receiving portion 1203. This allows the oil in the cylinder 1's inner cavity to enter the oil inlet 1205 through the oil guide groove 1204, and then enter the oil receiving portion 1203. In this embodiment, the oil guide groove 1204 can be a through-hole structure or a groove structure, and the oil inlet 1205 can be a through-hole structure or a groove structure; no limitation is made here. The lip portion 1202 is located on the side of the main body portion 1201 near the piston 3, and the oil-containing portion 1203 opens towards the side away from the piston 3, so that the lubricating oil can be retained between the oil guide sleeve 12 and the sealing sleeve 11 as much as possible, further extending the time that the lubricating oil remains in the oil-containing portion 1203, thereby further improving the lubrication effect on the piston rod 2.

[0065] Preferred, such as Figure 8 As shown, the oil guide groove 1204 has a groove structure, and the oil inlet 1205 has a groove structure. The oil inlet 1205 is located on the side of the main body 1201 away from the lip 1202. There are four oil guide grooves 1204, which are spaced apart along the outer periphery of the main body 1201. Each oil guide groove 1204 has an oil inlet 1205 at one end away from the lip 1202, and an oil guide surface 1206 at one end near the lip 1202. The oil guide surface 1206 is inclined and can guide the oil in the inner cavity of the cylinder 1 to the oil guide groove 1204.

[0066] Furthermore, such as Figure 7 As shown, an oil retaining ring 1208 is provided in the oil receiving part 1203. The oil retaining ring 1208 is an annular structure that extends axially upward. The oil retaining ring 1208 is located between the oil inlet 1205 and the lip part 1202. The oil retaining ring 1208 protrudes radially toward the central axis of the main body part 1201. There is a radial gap between the oil retaining ring 1208 and the outer wall surface of the piston rod 2. The oil retaining ring 1208 can play a certain role in blocking oil, so as to slow down the rate of oil leakage from the oil receiving part 1203 when the gas spring flips, and increase the oil flow path, further ensuring the contact time between the lubricating oil and the piston rod 2, and further ensuring the lubrication effect.

[0067] The outer wall of the oil baffle ring 1208 can be an arc-shaped structure or a rectangular structure; no restrictions are imposed here.

[0068] The main body 1201 has a clamping block 1207 on its outer periphery. The clamping block 1207 is located between two adjacent oil guide grooves 1204. The clamping block 1207 protrudes radially outward, and its outer diameter is greater than or equal to the inner diameter of the cylinder 1. This increases the tightness between the oil guide sleeve 12 and the cylinder 1, ensuring the axial stability of the oil guide sleeve 12 within the cylinder 1. Additionally, the clamping block 1207 can be designed with a marking function, such as a triangle, to indicate the installation direction and facilitate installation by workers.

[0069] It should be noted that, in this application, the working medium in the first chamber 101 and the second chamber 102 can be either gas or liquid.

[0070] Therefore, the piston 3 of the self-balancing gas spring of this application can achieve a self-buffering self-balancing effect when vibrating, and the piston rod 2 can also achieve dynamic self-balancing and automatically hover at any position when the external force is removed. It can also automatically accumulate oil to automatically lubricate the piston rod 2 to achieve silent operation.

[0071] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0072] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A self-balancing gas spring, characterized in that, include: Cylinder (1); The piston rod (2) is at least partially disposed inside the cylinder (1) and is axially movable relative to the cylinder (1); A piston (3) is disposed inside the cylinder (1); the piston (3) includes a body part (301), a plurality of support parts (3021) and a plurality of guide parts (3022), the body part (301) is sleeved on the piston rod (2) and is axially limited to the piston rod (2); The support portion (3021) and the guide portion (3022) are distributed circumferentially outside the body portion (301), and there is a radial deformation space (3023) between the guide portion (3022) and the body portion (301). When the guide part (3022) is in the first state, the end of the guide part (3022) away from the main body part (301) is in contact with the inner wall surface of the cylinder (1), and there is a radial gap between the outer wall surface of the support part (3021) and the inner wall surface of the cylinder (1). When the guide portion (3022) changes from the first state to the second state, the guide portion (3022) deforms toward the radial deformation space (3023); When the guide portion (3022) is in the second state, at least a portion of the outer wall surface of the support portion (3021) is in contact with the inner wall surface of the cylinder (1).

2. The self-balancing gas spring according to claim 1, characterized in that, The piston (3) also includes: At least two support arms (302) are distributed at intervals along the outer periphery of the main body (301); Each of the support arms (302) is provided with at least one guide portion (3022) and at least one support portion (3021); the outer diameter of the support portion (3021) is smaller than the outer diameter of the guide portion (3022).

3. The self-balancing gas spring according to claim 1, characterized in that, Also includes: The first groove (3024) is located between the adjacent guide portion (3022) and the support portion (3021), and is recessed radially toward the central axis of the piston (3); The second groove (3025) is located between two adjacent support portions (3021) and is recessed radially toward the central axis of the piston (3).

4. The self-balancing gas spring according to claim 2, characterized in that, The outer peripheral surface of the guide part (3022) is a plane or an arc surface, and the outer peripheral surface of the support part (3021) is a plane or an arc surface; The free end of the guide portion (3022) extends toward the adjacent support portion (3021), and the radial thickness of the guide portion (3022) gradually decreases along the extension direction of the guide portion (3022).

5. The self-balancing gas spring according to any one of claims 1 to 4, characterized in that, Also includes: A sealing assembly is slidably sleeved on the piston (3) along the axial direction; the outer wall surface of the sealing assembly is sealed to the inner wall surface of the cylinder (1), and the sealing assembly is used to divide the cylinder (1) into a first chamber (101) and a second chamber (102). A fluid passage is provided on the piston (3) and includes a sealing part (303) and a connecting part; the sealing assembly cooperates with the sealing part (303) to seal the first chamber (101) and the second chamber (102), and the sealing assembly cooperates with the connecting part to connect the first chamber (101) and the second chamber (102); The elastic element (4) is located on the side of the sealing assembly away from the piston (3) and is capable of applying a force in a first direction to the sealing assembly; Wherein, the first direction is the extension direction of the piston rod (2).

6. The self-balancing gas spring according to claim 5, characterized in that, The connecting portion includes a first connecting portion (304) and a second connecting portion (305), wherein the first connecting portion (304) and the second connecting portion (305) are located on opposite axial sides of the sealing portion (303); The end of the first connecting part (304) away from the sealing part (303) is always connected to the first chamber (101), and the end of the first connecting part (304) near the sealing part (303) has an opening on the radial outer wall of the piston (3). The end of the second connecting part (305) away from the sealing part (303) is always connected to the second chamber (102), and the end of the second connecting part (305) near the sealing part (303) has an opening on the radial outer wall of the piston (3).

7. The self-balancing gas spring according to claim 5, characterized in that, The sealing assembly includes: The sealing element (5) is axially floating and sleeved on the piston (3), located on the side of the guide (3022) near the second chamber (102); The sealing cylinder (6) includes a first cylindrical section (601) and a second cylindrical section (602) distributed along the axial direction. The first cylindrical part (601) is slidably sleeved on the piston (3), and the first cylindrical part (601) is located on the side of the seal (5) away from the guide part (3022); The second cylindrical portion (602) is located on the side of the first cylindrical portion (601) away from the seal (5), and the inner diameter of the second cylindrical portion (602) is smaller than the outer diameter of the piston (3).

8. The self-balancing gas spring according to claim 7, characterized in that, Also includes: The first flow channel (603) is located between the first cylindrical section (601) and the cylinder (1), and is normally connected to the second chamber (102); The second flow channel (604) is provided on the second cylindrical part (602) and extends through the second cylindrical part (602) parallel to the axial direction; the second flow channel (604) is normally connected to the second chamber (102).

9. The self-balancing gas spring according to claim 7, characterized in that, Also includes: A limiting sleeve (7) is sleeved on the piston rod (2) and located on the side of the piston (3) away from the first chamber (101); The first limiting seat (8) is sleeved on the piston rod (2) and located on the side of the piston (3) near the first chamber (101); The second limiting seat (9) is sleeved on the piston rod (2) and located on the side of the limiting sleeve (7) away from the piston (3); The elastic element (4) is sleeved on the limiting sleeve (7), and the two ends of the elastic element (4) in the axial direction interact with the sealing cylinder (6) and the second limiting seat (9) respectively.

10. The self-balancing gas spring according to claim 1, characterized in that, Also includes: A guide sleeve (10) is provided inside the cylinder (1) and has a guide hole through which the piston rod (2) passes; A sealing sleeve (11) is provided between the guide sleeve (10) and the piston (3); An oil guide sleeve (12) is provided between the sealing sleeve (11) and the piston (3) to guide lubricating oil to the outer wall surface of the piston rod (2); The limiting part (103) is provided on the inner wall surface of the cylinder (1) and is located between the oil guide sleeve (12) and the piston (3) for axially limiting the piston (3) and the oil guide sleeve (12).

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