Gas spring

Abstract

The utility model discloses a gas spring which comprises an outer cylinder, an inner cylinder arranged in the outer cylinder, a piston arranged in the inner cylinder and a piston rod connected with the piston, the outer cylinder comprises an inner cylinder fixing part and a gas cavity part, the inner cylinder is fixed to the inner cylinder fixing part, a first gas cavity is formed in the gas cavity part, and a second gas cavity is formed in the gas cavity part. A telescopic sealing bag is further arranged in the inner barrel fixing part and can deform, one side of the telescopic sealing bag is communicated with the oil cavity and can receive oil from the interior of the oil cavity, the other side of the telescopic sealing bag is communicated with the first air cavity, and the second air cavity is communicated with the second air cavity and can receive oil from the interior of the oil cavity. And the side of the telescopic sealing bag can extrude gas in the first gas cavity. According to the utility model, the inner cylinder and the outer cylinder can be relatively fixed, stable support is realized, large impact can be borne, and the sealing structure can be prevented from being abraded.

Description

Technical Field

[0001] The utility model relates to the technical field of gas springs, in particular to a gas spring. Background Art

[0002] Gas springs are widely used in automobiles, mechanical equipment and other fields that require buffering and support. Its main structure usually includes an inner cylinder, an outer cylinder, a piston assembly, a sealing assembly and a valve assembly. When a traditional gas spring works, it provides a reaction force through compressed gas to achieve buffering, and provides a reaction force through hydraulic pressure to achieve the support function. In the prior art, the inner cylinder of the gas spring is arranged inside the outer cylinder, the piston and the piston rod are arranged inside the inner cylinder. When the piston rod is forced to extend into the inner cylinder, the valve assembly opens, enabling the piston to move inside the inner cylinder. While the piston is moving, it will generate a force on the inner cylinder, causing the inner cylinder to move in the air chamber. The air chamber is usually filled with gas. When the inner cylinder compresses the air chamber, the gas can generate a reaction force on the inner cylinder. When the external force on the piston rod is removed, the reaction force of the gas will push the inner cylinder to move outwards, and at the same time, the hydraulic oil in the inner cylinder will push the piston to move inside the inner cylinder, thereby pushing the piston rod to extend outwards from the inner cylinder. In the structure of this traditional gas spring, the inner cylinder and the outer cylinder can move relative to each other. This relatively movable structure will cause the inner cylinder to forcibly compress the air chamber when the piston rod is subjected to a large impact force, thus unable to achieve stable support. Moreover, when in use, the sealing structure between the inner cylinder and the outer cylinder needs to adopt a floating structure, which cannot achieve good sealing, and the sealing structure is prone to damage during repeated movement, affecting the service life. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a gas spring in which the inner cylinder and the outer cylinder can be relatively fixed to achieve stable support, which can withstand large impacts and avoid wear of the sealing structure.

[0004] To solve the above technical problem, the utility model provides a gas spring, which includes an outer cylinder, an inner cylinder arranged inside the outer cylinder, a piston arranged inside the inner cylinder, and a piston rod connected to the piston. The piston rod extends outwards from the piston towards the outside of the inner cylinder, and the piston is movably connected to the inner cylinder.

[0005] The outer cylinder includes an inner cylinder fixing part and an air chamber part. The inner cylinder is fixed to the inner cylinder fixing part, the air chamber part is arranged on the side of the inner cylinder fixing part, and a first air chamber is arranged inside the air chamber part.

[0006] An expansion sealing bladder is also provided inside the inner cylinder fixing part. The expansion sealing bladder can deform. One side of the expansion sealing bladder communicates with the oil chamber. This side of the expansion sealing bladder can receive the oil liquid from the oil chamber. The other side of the expansion sealing bladder communicates with the first air chamber. This side of the expansion sealing bladder can extrude the gas in the first air chamber.

[0007] As an improvement to the above solution, an oil chamber is provided inside the inner cylinder. The oil chamber is separated by the piston. The piston divides the oil chamber into a first oil chamber and a second oil chamber. The piston rod passes through the first oil chamber and communicates with the piston. The second oil chamber is arranged between the first oil chamber and the first air chamber.

[0008] As an improvement to the above solution, the expansion sealing bladder includes an oil liquid side and a gas side arranged oppositely. The oil liquid side and the outer wall of the inner cylinder form a third oil chamber. The gas side and the inner wall of the outer cylinder form a second air chamber. The third oil chamber communicates with the first oil chamber. The second air chamber communicates with the first air chamber.

[0009] As an improvement to the above solution, a liquid through hole is provided on the side wall of the inner cylinder. The first oil chamber communicates with the third oil chamber through the liquid through hole. An inner sealing seat is also provided between the inner cylinder and the outer cylinder. An air through hole is provided on the side part of the inner sealing seat. The second air chamber communicates with the first air chamber through the air through hole.

[0010] As an improvement to the above solution, a support retaining ring is also provided outside the liquid through hole. The inner ring of the support retaining ring is connected to the outer side wall of the inner cylinder. The outer ring of the support retaining ring extends obliquely away from the outer side wall of the inner cylinder. The outer ring of the support retaining ring blocks between the oil liquid side and the outer wall of the inner cylinder and retains a gap with the opening of the liquid through hole.

[0011] As an improvement to the above solution, a crimping ring is provided at the connection between the inner cylinder and the expansion sealing bladder. The crimping ring is sleeved outside the inner cylinder and is located inside the outer cylinder. The crimping ring crimps the ends of the expansion sealing bladder onto the inner cylinder respectively.

[0012] As an improvement to the above solution, crimping grooves are provided on the outer wall surfaces at both ends of the inner cylinder. The crimping grooves are recessed in the outer wall surface of the inner cylinder. The number of the crimping grooves is multiple. The crimping ring crimps the two ends of the expansion sealing bladder into the crimping grooves at both ends of the inner cylinder respectively.

[0013] As an improvement to the above solution, the gas spring further includes a fixing ring which is fixed inside the outer cylinder. The fixing ring is fixedly connected to the end of the inner cylinder. The outer cylinder further includes a limiting boss which protrudes from the inner wall of the outer cylinder. A limiting ring groove is provided on the side of the fixing ring, and the limiting boss can be inserted into the limiting ring groove.

[0014] As an improvement to the above solution, the gas spring further includes a needle valve assembly which includes a valve needle and a connecting cover. The connecting cover is arranged inside the piston. The valve needle passes through the connecting cover and is movably connected to the piston. A valve hole is provided at the end of the piston, and the valve hole can communicate with the second oil chamber. The valve needle controls the opening and closing of the valve hole, and the connecting cover can communicate between the valve hole and the first oil chamber.

[0015] As an improvement to the above solution, the valve needle includes a limiting part and a blocking part. A limiting convex block is provided on the limiting part and protrudes from the side wall of the limiting part. The position of the connecting cover corresponds to the position of the limiting part. A limiting cavity is provided inside the connecting cover, and the valve needle can move inside the limiting cavity. The limiting cavity can limit the moving range of the limiting convex block, and the blocking part can be inserted into the valve hole.

[0016] Implementing the present utility model has the following beneficial effects:

[0017] The gas spring of the present utility model is provided with an outer cylinder, an inner cylinder, a piston, a piston rod and a telescopic sealing bladder. The piston rod can push the piston to move inside the inner cylinder. An oil chamber is provided inside the inner cylinder, and there is oil liquid in the oil chamber. A first air chamber is provided inside the outer cylinder. The telescopic sealing bladder can generate deformation. One side of the telescopic sealing bladder communicates with the oil chamber, and the other side of the telescopic sealing bladder communicates with the first air chamber. During use, the piston rod pushes the piston into the inner cylinder. Since the inner cylinder is fixed to the inner cylinder fixing part of the outer cylinder, even if the inner cylinder is stressed, it will not move. And the oil liquid in the inner cylinder can only enter one side of the telescopic sealing bladder, causing an expansion deformation to the other side of the telescopic sealing bladder. The expansion deformation of the telescopic sealing bladder exerts a pressure on the gas in the first air chamber, causing a reaction force of the gas in the first air chamber. When the external force on the piston rod is removed, the reaction force generated by the gas in the first air chamber can be transmitted to the piston rod through the oil liquid, causing the piston rod to extend from the inner cylinder. During this process, the inner cylinder and the outer cylinder can remain relatively fixed to each other. Even when subjected to a large impact force, stable support can be achieved, and the inner cylinder will not move relative to the outer cylinder. The sealing mechanism between the inner cylinder and the outer cylinder will not undergo a process of repeated abrasion, so wear of the sealing structure can also be avoided. Description of the Drawings

[0018] Figure 1 is a partial sectional structure schematic diagram of the gas spring of the present utility model;

[0019] Figure 2 is Figure 1 a partial enlarged view of A in

[0020] Figure 3 is Figure 1 a partial enlarged view of B in

[0021] Figure 4 is Figure 1 a partial enlarged view of C in

[0022] Figure 5 is a structural schematic diagram of the valve needle of the present utility model. Specific embodiments

[0023] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside and outside that appear or will appear in the text of the present utility model are only based on the accompanying drawings of the present utility model, and they do not specifically limit the present utility model.

[0024] Refer to Figure 1 and Figure 2 , an embodiment of the present utility model discloses a gas spring, which includes an outer cylinder 1, an inner cylinder 2 disposed inside the outer cylinder 1, a piston 3 disposed inside the inner cylinder 2, and a piston rod 4 connected to the piston 3. One end of the piston rod 4 is connected to the piston 3, and the other end of the piston rod 4 extends out of the piston 3 towards the outside of the inner cylinder 2. The piston 3 is movably connected to the inner cylinder 2. By pushing the piston rod 4, the piston 3 can be moved in the inner cylinder 2.

[0025] An oil cavity is provided inside the inner cylinder 2. The oil cavity is separated by the piston 3. Among them, the piston divides the oil cavity into a first oil cavity 21 and a second oil cavity 22. The first oil cavity 21 is located near the outer side of the inner cylinder 2, and the second oil cavity 22 is located near the inner side of the inner cylinder 2. A needle valve assembly 7 is provided inside the piston 3. The needle valve assembly 7 is movably connected to the piston 3, and the needle valve assembly 7 can control the communication or isolation between the first oil cavity 21 and the second oil cavity 22. When the needle valve assembly 7 is closed, the oil in the first oil cavity 21 and the second oil cavity 22 cannot be exchanged. Also, since the oil is difficult to compress, the piston 3 cannot move in the first oil cavity 21 and the second oil cavity 22, thus forming a fixed support for the outside; when the needle valve assembly 7 is opened, the first oil cavity 21 and the second oil cavity 22 are connected, and at this time the piston 3 can move between the first oil cavity 21 and the second oil cavity 22. When the piston 3 extends into the inner side of the inner cylinder 2, the oil in the second oil cavity 22 enters the first oil cavity 21 through the needle valve assembly 7. When the piston 3 moves towards the outer side of the inner cylinder 2, the oil in the second oil cavity 22 enters the first oil cavity 21 through the needle valve assembly 7, thereby realizing the adjustment of the position of the piston 3.

[0026] The outer cylinder 1 includes an inner cylinder fixing part 11 and an air cavity part 12. The inner cylinder 2 is fixed to the inner cylinder fixing part 11. The air cavity part 12 is provided on the side of the inner cylinder fixing part 11. A first air cavity 121 is provided inside the air cavity part 12. The first air cavity 121 is filled with gas, and the volume in the first air cavity 121 remains unchanged. The inner cylinder 2 is fixed to the outer cylinder 1 and does not produce relative movement, so that it can be ensured that the structure between the inner cylinder 2 and the outer cylinder 1 is a fixed sealing structure, which will not cause wear and can also improve the sealing performance. Moreover, when the inner cylinder 2 is subjected to a large impact, it can resist the impact by relying on the fixed structure, realizing the stability of the support.

[0027] Since the inner cylinder 2 is fixed, in order to realize the oil exchange between the first oil cavity 21 and the second oil cavity 22 and enable the piston 3 to move in the inner cylinder 2, a telescopic sealing bag 5 is further provided inside the inner cylinder fixing part 11. The telescopic sealing bag 5 can deform. The telescopic sealing bag 5 is in a bag shape and can produce expansion deformation and contraction deformation. One side of the telescopic sealing bag 5 is communicated with the first oil cavity 21, and this side of the telescopic sealing bag 5 can receive the oil from the first oil cavity 21. The other side of the telescopic sealing bag 5 is communicated with the first air cavity 121, and this side of the telescopic sealing bag 5 can squeeze the gas in the first air cavity 121.

[0028] When the piston rod 4 is pushed by a force to move the piston 3 into the inner cylinder 2, the needle valve assembly 7 is opened to connect the first oil chamber 21 with the second oil chamber 22. The piston 3 can move in the inner cylinder 2, and the oil in the second oil chamber 22 enters the first oil chamber 21. The piston rod 4 occupies the volume in the inner cylinder 2, and the oil in the first oil chamber 21 can enter one side of the telescopic seal bag 5, causing the telescopic seal bag 5 to expand towards the other side. Since the first air chamber 121 is filled with gas, the telescopic seal bag 5 compresses the gas in the first air chamber 121. After the piston 3 is adjusted to a proper position, the needle valve assembly 7 is closed, and the first oil chamber 21 and the second oil chamber 22 cannot exchange oil, and the piston 3 is fixed at the current position to form a fixing effect.

[0029] When the piston rod 4 needs to extend out of the inner cylinder 2, the needle valve assembly 7 is opened. Since the telescopic seal bag 5 compresses the gas in the first air chamber 121, the gas in the first air chamber 121 generates a reaction force on the telescopic seal bag 5. This reaction force can act on the first oil chamber 21 and the second oil chamber 22 through the other side of the telescopic seal bag 5. Therefore, when this reaction force is greater than the sum of the external atmospheric pressure, the acting force of the piston rod 4, and the friction force, the oil on one side of the telescopic seal bag 5 will be reinjected into the first oil chamber 21 and the second oil chamber 22, and the piston 3 will be pushed out, thereby realizing the extension of the piston rod 4.

[0030] The beneficial effects of the embodiments of the present utility model are as follows:

[0031] In the embodiment of the present utility model, the gas spring is provided with an outer cylinder, an inner cylinder, a piston, a piston rod and a telescopic sealing bladder. The piston rod can push the piston to move in the inner cylinder. An oil cavity is arranged in the inner cylinder, and there is oil liquid in the oil cavity. A first gas cavity is arranged in the outer cylinder. The telescopic sealing bladder can generate deformation. One side of the telescopic sealing bladder is communicated with the oil cavity, and the other side of the telescopic sealing bladder is communicated with the first gas cavity. When in use, the piston rod pushes the piston into the inner cylinder. Since the inner cylinder is fixed to the inner cylinder fixing part of the outer cylinder, even if the inner cylinder is stressed, it will not move. And the oil liquid in the inner cylinder can only enter one side of the telescopic sealing bladder, causing an expansion deformation on the other side of the telescopic sealing bladder. The expansion deformation of the telescopic sealing bladder squeezes the gas in the first gas cavity, causing a reaction force of the gas in the first gas cavity. When the external force on the piston rod is removed, the reaction force generated by the gas in the first gas cavity can be transmitted to the piston rod through the oil liquid, causing the piston rod to extend from the inner cylinder. During this process, the relative fixation can be maintained between the inner cylinder and the outer cylinder. Even when subjected to a large impact force, stable support can be achieved. Moreover, the inner cylinder will not move relative to the outer cylinder, and the sealing mechanism between the inner cylinder and the outer cylinder will not undergo a process of repeated abrasion. Therefore, wear of the sealing structure can also be avoided.

[0032] Specifically, referring to Figure 2 , the telescopic sealing bladder 5 includes an oil liquid side 51 and a gas side 53 which are oppositely arranged. The oil liquid side 51 and the outer wall of the inner cylinder 2 form a third oil cavity 52. The gas side 53 and the inner wall of the outer cylinder 1 form a second gas cavity 54. The third oil cavity 52 is communicated with the first oil cavity 21. The second gas cavity 54 is communicated with the first gas cavity 121. Among them, in the embodiment of the present utility model, both ends of the telescopic sealing bladder 5 are connected to the outer wall of the inner cylinder 2 at the sealed ends. In this way, the telescopic sealing bladder 5 and the inner cylinder 2 form a sealed cavity, that is, the third oil cavity 52. The oil liquid side 51 of the telescopic sealing bladder 5 is located inside the telescopic sealing bladder 5, and the gas side 53 is located outside the telescopic sealing bladder 5. The gas side 53 and the inner wall of the outer cylinder 1 form a cavity, that is, the second gas cavity 54. In other embodiments, one end of the telescopic sealing bladder 5 can also be sealed and connected to the outer wall of the inner cylinder 2 respectively, and then the other end of the sealed end can be connected to the inner wall of the outer cylinder 1. In this way, the side of the telescopic sealing bladder 5 far from the outer wall of the inner cylinder 2 and the outer wall of the inner cylinder 2 form a cavity, that is, the third oil cavity 52, and the side of the telescopic sealing bladder 5 close to the outer wall of the inner cylinder 2 and the inner wall of the outer cylinder 1 form a cavity, that is, the second gas cavity 54.

[0033] Referring to Figure 2A liquid through hole 23 is provided on the side wall of the inner cylinder 2, and the first oil chamber 21 is connected to the third oil chamber 52 through the liquid through hole 23, and the oil flows between the first oil chamber 21 and the third oil chamber 52 through the liquid through hole 23. An inner sealing seat 24 is also provided between the inner cylinder 2 and the outer cylinder 1, and the inner sealing seat 24 is provided at one end of the inner cylinder 2 close to the first air chamber 121, and an air through hole 25 is provided on the side of the inner sealing seat 24, and the second air chamber 54 is connected to the first air chamber 121 through the air through hole 25.

[0034] The inner seal seat 24 is fixed to the end of the inner cylinder 2 away from the piston rod 4 and seals the second oil chamber 22. The inner seal seat 24 isolates the second oil chamber 22 from the first air chamber 121. An inner fixed seat 26 is also provided between the inner cylinder 2 and the outer cylinder 1. The inner fixed seat 26 is fixed to the end of the inner cylinder 2 opposite to the inner seal seat 24 and seals the first oil chamber 21. The inner seal seat 24 and the inner fixed seat 26 both seal and fix the end of the inner cylinder 2.

[0035] In order to ensure that the liquid through hole 23 is always connected between the third oil chamber 52 and the first oil chamber 21, and to prevent the telescopic sealing bag 5 from blocking the liquid through hole 23 when shrinking, a support ring 27 is further provided on the outside of the liquid through hole 23, the inner ring of the support ring 27 is connected to the outer wall of the inner tube 2, the outer ring of the support ring 27 is inclined and extended in a direction away from the outer wall of the inner tube 2, and the outer ring of the support ring 27 is blocked between the inner wall of the oil side 51 and the outer wall of the inner tube 2 and a gap is reserved with the opening of the liquid through hole 23. The support ring 27 is made of hard material, and can open a certain gap at the connection between the telescopic sealing bag 5 and the inner tube 2, so that the telescopic sealing bag 5 can always keep a distance from the inner tube 2, thereby ensuring the continuous communication of the liquid through hole 23, so that when the telescopic sealing bag 5 shrinks and becomes smaller, the telescopic sealing bag 5 will not be attached to the liquid through hole 23, and the telescopic sealing bag 5 is prevented from blocking the liquid through hole 23. At the same time, the support retaining ring 27 opens a certain space for the telescopic sealing bag 5, which also facilitates the oil to have a larger entry space when entering the telescopic sealing bag 5 from the first oil chamber 21, thereby ensuring a larger flow rate during entry and a quick response.

[0036] In addition, in order to fix the telescopic sealing bag 5, a crimping ring 28 is provided at the connection between the inner tube 2 and the telescopic sealing bag 5. The crimping ring 28 is sleeved on the outside of the inner tube 2 and located inside the outer tube 1. The crimping ring 28 crimps the end of the telescopic sealing bag 5 onto the inner tube 2, thereby fixing and sealing the telescopic sealing bag 5.

[0037] Further, in order to achieve a better seal, crimping grooves 29 are provided on the outer wall surfaces at both ends of the inner cylinder 2. The crimping grooves 29 are recessed from the outer wall surface of the inner cylinder 2. The number of the crimping grooves 29 is multiple. The crimping ring 28 crimps both ends of the telescopic sealing bladder 5 into the crimping grooves 29 at both ends of the inner cylinder 2 respectively. The telescopic sealing bladder 5 is made of a soft material. When being pressed by the crimping ring 28, since the crimping grooves 29 are recessed from the outer wall surface of the inner cylinder 2, the telescopic sealing bladder 5 will sink into the crimping grooves 29, forming a multi-layer sealing structure. If fluids such as gas or oil need to cross the crimping position, they need to pass through the multi-layer sealing structure, thereby forming a good sealing effect.

[0038] See Figure 3 , the gas-liquid system for the gas spring further includes a fixing ring 6. The fixing ring 6 is fixed inside the outer cylinder 1. The fixing ring 6 is fixedly connected to one end of the inner cylinder 2. The fixing ring 6 can form a fixed limit for the inner cylinder 2.

[0039] In order to fix the fixing ring 6, the outer cylinder 1 further includes a limiting boss 13. The limiting boss 13 protrudes from the inner wall of the outer cylinder 1. The limiting boss 13 protrudes towards the inside of the outer cylinder 1. A limiting ring groove 61 is provided on the side of the fixing ring 6. The limiting boss 13 can be inserted into the limiting ring groove 61. The limiting boss 13 can form a limit fixation for the fixing ring 6, thereby further fixing the inner cylinder 2, preventing the inner cylinder 2 from moving, and ensuring the stability of the support.

[0040] See Figure 4 , the needle valve assembly 7 includes a valve needle 71 and a communication cover 73. The communication cover 73 is arranged inside the piston 3. The valve needle 71 passes through the communication cover 73 and is movably connected to the piston 3. The piston 3 is hermetically arranged between the first oil chamber 21 and the second oil chamber 22. A valve hole 31 is provided at the end of the piston 3. The valve needle 71 controls the opening and closing of the valve hole 31. The valve hole 31 can communicate with the second oil chamber 22. The communication cover 73 can communicate between the valve hole 31 and the first oil chamber 21. When the inner cylinder 2 is fixed, when the piston 3 moves, the oil exchange between the first oil chamber 21 and the second oil chamber 22 will be accelerated. In order to prevent the oil from impacting the valve needle 71 and causing the risk of the valve needle 71 falling off, a limiting cavity 74 is provided inside the communication cover 73. A limiting convex block 72 is provided on the valve needle 71. The limiting convex block 72 is fixed to the side wall of the valve needle 71. The valve needle 71 can move inside the limiting cavity 74. The limiting cavity 74 can limit the moving range of the limiting convex block 72. In order to ensure the stability of the limiting convex block 72, the limiting convex block 72 and the valve needle 71 are an integrally formed integral structure.

[0041] See Figure 5 , the valve needle 71 includes a limit portion 711 and a plugging portion 712. The limit bump 72 is provided on the limit portion 711 and protrudes from the side wall of the limit portion 711. The position of the communication cover 73 corresponds to the position of the limit portion 711. A limit cavity 74 is provided in the communication cover 73. The valve needle 71 can move in the limit cavity 74, and the limit cavity 74 can limit the moving range of the limit bump 72. During the movement of the valve needle 71, the plugging portion 712 can be inserted into the valve hole 31.

[0042] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A gas spring, characterized in that: It comprises an outer cylinder, an inner cylinder arranged in the outer cylinder, a piston arranged in the inner cylinder and a piston rod connected to the piston, wherein the piston rod extends from the piston toward the outside of the inner cylinder, and the piston is movably connected to the inner cylinder; The outer tube comprises an inner tube fixing portion and an air cavity portion, the inner tube is fixed to the inner tube fixing portion, the air cavity portion is arranged at a side of the inner tube fixing portion, and a first air cavity is arranged in the air cavity portion; A telescopic sealing bag is also provided in the inner tube fixing portion, and the telescopic sealing bag can produce deformation. One side of the telescopic sealing bag is connected to the oil cavity, and this side of the telescopic sealing bag can receive oil from the oil cavity. The other side of the telescopic sealing bag is connected to the first air cavity, and this side of the telescopic sealing bag can squeeze the gas in the first air cavity.

2. The gas spring according to claim 1, characterized in that: An oil chamber is provided in the inner cylinder, and the oil chamber is divided by the piston; the piston divides the oil chamber into a first oil chamber and a second oil chamber, the piston rod passes through the first oil chamber and communicates with the piston, and the second oil chamber is provided between the first oil chamber and the first air chamber.

3. The gas spring according to claim 2, characterized in that: The telescopic sealing bag includes an oil side and a gas side that are arranged opposite to each other. The oil side and the outer wall of the inner tube form a third oil cavity, and the gas side and the inner wall of the outer tube form a second gas cavity. The third oil cavity is connected to the first oil cavity, and the second gas cavity is connected to the first gas cavity.

4. The gas spring according to claim 3, characterized in that: A liquid through hole is provided on the side wall of the inner cylinder, and the first oil chamber is connected with the third oil chamber through the liquid through hole. An inner sealing seat is also provided between the inner cylinder and the outer cylinder, and an air through hole is provided on the side of the inner sealing seat, and the second air chamber is connected with the first air chamber through the air through hole.

5. The gas spring according to claim 4, characterized in that: A support baffle ring is also provided on the outer side of the liquid through hole, the inner ring of the support baffle ring is connected to the outer side wall of the inner tube, the outer ring of the support baffle ring is inclined and extends in a direction away from the outer side wall of the inner tube, the outer ring of the support baffle ring is blocked between the oil side and the outer wall of the inner tube and retains a gap with the opening of the liquid through hole.

6. The gas spring according to claim 1, characterized in that: A crimping ring is provided at the connection between the inner cylinder and the telescopic sealing bag. The crimping ring is sleeved outside the inner cylinder and located inside the outer cylinder. The crimping ring crimps the ends of the telescopic sealing bag onto the inner cylinder respectively.

7. The gas spring according to claim 6, characterized in that: The outer wall surfaces at both ends of the inner tube are provided with crimping grooves, which are recessed in the outer wall surface of the inner tube. There are multiple crimping grooves, and the crimping ring crimps the two ends of the telescopic sealing bag into the crimping grooves at both ends of the inner tube respectively.

8. The gas spring according to claim 1, characterized in that: The gas spring also includes a fixing ring, which is fixed in the outer tube and fixedly connected to the end of the inner tube. The outer tube also includes a limiting boss, which protrudes from the inner wall of the outer tube. A limiting ring groove is provided on the side of the fixing ring, and the limiting boss can be inserted into the limiting ring groove.

9. The gas spring according to claim 2, characterized in that: The gas spring also includes a needle valve assembly, which includes a valve needle and a connecting cover. The connecting cover is arranged in the piston, and the valve needle passes through the connecting cover and is movably connected to the piston. A valve hole is provided at the end of the piston, and the valve hole can be connected with the second oil chamber. The valve needle controls the opening and closing of the valve hole, and the connecting cover can be connected between the valve hole and the first oil chamber.

10. The gas spring according to claim 9, characterized in that The valve needle includes a limiting portion and a blocking portion, the limiting portion is provided with a limiting protrusion, and the limiting protrusion protrudes from the side wall of the limiting portion, the position of the connecting cover corresponds to the position of the limiting portion, and a limiting cavity is provided in the connecting cover, the valve needle can move in the limiting cavity, the limiting cavity can limit the moving range of the limiting protrusion, and the blocking portion can be inserted into the valve hole.

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