Single-cylinder damper

Abstract

The utility model discloses a single-cylinder damper which comprises a cylinder body and a sliding piston driven in the cylinder body through a piston rod, a fixed piston is arranged in the cylinder body, the sliding piston is located below the fixed piston, a first circulation hole is formed in the fixed piston, the lower end of the fixed piston is sleeved with a valve block in a sliding mode, and a throttling hole is formed between the valve block and the fixed piston. The fixed piston and the sliding piston divide the cylinder body into a first cavity, a second cavity and a third cavity from top to bottom, and the flow channel penetrates through the first circulation hole and the second cavity. According to the scheme, the problems that the leakage risk is increased and the service life of the damper is shortened due to reciprocating motion of a floating piston in an existing single-cylinder damper are solved through the fixed piston; and the structure is simple, the oil supplementing speed is high, idle stroke is avoided, damping is stable, high resistance is generated at a low speed, accessories are universal, the market is easy to purchase, and batch cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a single-cylinder damper. Background Art

[0002] A damper is a device that provides resistance to movement and dissipates the energy of movement. There are oil dampers, solid viscous dampers, air dampers, and friction dampers. The damper is mainly composed of a piston, a cylinder, and a liquid. The piston divides the cylinder into two parts. The piston moves in one direction under the action of an external force, and the liquid is squeezed, and the liquid flows to the other end of the piston through the hole on the piston. The damper is a device that provides resistance to movement and dissipates the energy of movement. Various dampers (or shock absorbers) have long been used in aerospace, aviation, military, guns, automobiles and other industries to reduce vibration and dissipate energy. A floating piston is set in the existing single-cylinder damper to improve the impact resistance and buffering performance of the damper. Due to the frequent reciprocating motion of the floating piston, there is a risk of leakage, thereby reducing the service life of the damper.

[0003] For example, Chinese patent publication number CN107489723A, published on December 19, 2017, is named "Damper with floating piston", which includes a piston rod, a guide sleeve, an oil seal, a steel pipe, and a rear head. The guide sleeve and the steel pipe are fixedly connected. The rear head is arranged at the lower end of the steel pipe. The lower end of the piston rod passes through the guide sleeve and the oil seal from top to bottom and then extends into the steel pipe, and a piston is fixedly arranged thereon. An inner concave ring is arranged in the middle of the steel pipe. The upper surface of the piston is lower than the plane where the curve where the inner convex ring corresponding to the concave ring and the lower section of the steel pipe intersect is located or is in contact with the plane. The piston is provided with an oil guide hole that connects its upper and lower surfaces. A cylindrical tubular floating piston is arranged above the piston rod, and the floating piston is sealed to the inner surface of the steel pipe and the piston rod. A lower floating piston is arranged below the piston rod. The space between the floating piston and the lower floating piston is filled with oil medium. The space between the floating piston and the oil seal is filled with gas medium. One end of the air guide hole of the rear head is connected to the space between the lower floating piston and the rear head, and the other end is connected to the space between the floating piston and the oil seal.

[0004] The disadvantages of the existing patent are: a floating piston is provided in the existing single-cylinder damper to improve the impact resistance and buffering performance of the damper. Due to the frequent reciprocating motion of the floating piston, there is a risk of leakage, thereby reducing the service life of the damper. Utility Model Content

[0005] The utility model aims to solve the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper, and provides a single-cylinder damper with reduced leakage risk and increased service life.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A single-cylinder damper includes a cylinder body and a sliding piston driven in the cylinder body by a piston rod, wherein a fixed piston is provided in the cylinder body, the sliding piston is located below the fixed piston, a first flow hole is provided on the fixed piston, a valve plate is provided on the sliding sleeve at the lower end of the fixed piston, a throttling hole is provided between the valve plate and the fixed piston, the fixed piston and the sliding piston divide the cylinder body into a first chamber, a second chamber and a third chamber from top to bottom, and the throttling hole passes through the first flow hole and the second chamber. The single-cylinder damper described in this solution solves the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper by using a fixed piston. The fixed piston is fixed in the cylinder body so that the volume of the first chamber is fixed and the total volume of the second chamber and the third chamber is fixed. The sliding piston is slidably arranged in the second chamber and the third chamber. When the piston rod is compressed into the cylinder, the liquid in the second and third chambers enters the first chamber, compressing the gas in the first chamber; when the piston rod is stretched out of the cylinder, the liquid in the first chamber is replenished into the second and third chambers, thus completing the cycle. The fixed piston is fixed in the cylinder, does not need to move repeatedly, avoids leakage, and increases the service life of the damper.

[0008] The sliding sleeve at the lower end of the fixed piston is provided with a valve plate, and a throttling hole is provided between the valve plate and the fixed piston, and the throttling hole passes through the first flow hole and the second chamber.

[0009] Take the piston rod downward setting as an example:

[0010] When the piston rod is compressed into the cylinder, part of the liquid in the second chamber enters the first chamber. At this time, the liquid in the second chamber presses the valve plate against the end of the sliding piston, that is, the valve plate is pressed against the end of the first flow hole, and the liquid in the second chamber enters the first chamber through the throttle hole and the first flow hole in sequence. When the damper is compressed, the resistance is further increased, the compression speed of the piston rod into the cylinder is slowed down, and the impact caused by the compression of the damper is prevented. The damper has the advantages of no lost motion, stable damping, and high resistance at low speed.

[0011] When the piston rod is pulled out of the cylinder body, the liquid in the third chamber enters the second chamber, and the liquid in the first chamber enters the second chamber. At this time, the liquid in the first chamber flushes the valve plate open, so that the liquid in the first chamber is quickly replenished into the second chamber, making the damper replenish oil quickly, without lost travel, and with stable damping.

[0012] Preferably, a limiting portion is provided at the lower end of the fixed piston, and the limiting portion limits the valve plate at the lower end of the fixed piston. The limiting portion is used to limit the valve plate at the lower end of the fixed piston, and a guide portion is provided at the lower end of the fixed piston, and the valve plate is sleeved on the guide portion and moves along the central axial direction of the fixed piston.

[0013] Preferably, a limiting protrusion is provided on the inner wall of the cylinder body, and a limiting groove is provided on the side wall of the fixed piston, and the limiting protrusion cooperates with the limiting groove. The limiting protrusion cooperates with the limiting groove so that the fixed piston is fixed on the inner wall of the cylinder body to prevent the fixed piston from sliding when the damper is running.

[0014] Preferably, a first sealing ring is provided in the limiting groove, and the limiting protrusion presses the first sealing ring tightly in the limiting groove. The first sealing ring enhances the sealing and stability between the fixed piston and the inner wall of the cylinder body.

[0015] Preferably, the limiting part is a bolt, the rod of the bolt is tightened on the fixed piston, and the head of the screw limits the valve plate on the fixed piston. The bolt includes a rod and a head, the rod of the bolt plays a connecting and fixing role, and the head of the bolt plays a limiting role.

[0016] Preferably, the sliding piston is provided with a second flow hole, and the second flow hole passes through the second chamber and the third chamber.

[0017] Preferably, the piston rod passes through the lower end of the cylinder body and is connected to the sliding piston, and the piston rod is slidably arranged at the lower end of the cylinder body through a guide sleeve. The piston rod is arranged downward, so that the damper has no idle travel phenomenon during the stretching process and the compression process. When the piston rod is compressed into the cylinder body, part of the liquid in the second chamber enters the first chamber, and the other part of the liquid enters the third chamber, compressing the gas in the first chamber to provide volume; when the piston rod is stretched out of the cylinder body, the liquid in the third chamber is replenished into the second chamber, and the liquid in the first chamber is replenished into the second chamber, and the gas expands to provide power for the liquid, thereby completing the cycle.

[0018] Preferably, a sealing groove is provided on the side wall of the sliding piston, and a second sealing ring is provided in the sealing groove. The second sealing ring improves the sealing effect between the sliding piston and the inner wall of the cylinder body.

[0019] Preferably, the throttle hole comprises a throttle groove arranged on the lower end surface of the fixed piston, and the throttle groove and the valve plate form a throttle hole. The cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the first flow hole.

[0020] Preferably, the throttling hole is located on the valve plate, and the cross-sectional area of ​​the throttling hole is smaller than the cross-sectional area of ​​the first flow hole.

[0021] Preferably, the total volume of the second chamber and the third chamber is fixed. The fixed piston solves the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper. The fixed piston is fixed in the cylinder body, so that the volume of the first chamber is fixed, and the total volume of the second chamber and the third chamber is fixed.

[0022] Preferably, the cylinder is filled with oil and air or high-pressure gas at the same time, the oil fills the second chamber and the third chamber, the oil exists in the first chamber, and the air or high-pressure gas is always located in the first chamber.

[0023] Therefore, the utility model has the following beneficial effects: it solves the problem of increased leakage risk and reduced service life of the damper due to the reciprocating motion of the floating piston in the existing single-cylinder damper by fixing the piston; and has the advantages of simple structure, fast oil replenishment speed, no dead space, stable damping, high resistance at low speed, universal accessories, easy purchase in the market, and low batch cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0026] As shown in the figure:

[0027] Cylinder body 1, first chamber 1.1, second chamber 1.2, third chamber 1.3, limiting protrusion 1.4,

[0028] Sliding piston 2,

[0029] Fixed piston 3, first flow hole 3.1, throttle hole 3.2, limit groove 3.3,

[0030] Valve plate 4, limiting part 5, first sealing ring 6, piston rod 7. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Embodiment 1, as Figure 1 , Figure 2A single-cylinder damper is shown, comprising a cylinder body 1 and a sliding piston 2 driven in the cylinder body 1 by a piston rod 7, wherein a fixed piston 3 is arranged in the cylinder body 1, the sliding piston 2 is located below the fixed piston 3, a first flow hole 3.1 is arranged on the fixed piston 3, a valve plate 4 is arranged on the sliding sleeve at the lower end of the fixed piston 3, a throttling hole 3.2 is arranged between the valve plate 4 and the fixed piston 3, the fixed piston 3 and the sliding piston 2 divide the cylinder body 1 from top to bottom into a first chamber 1.1, a second chamber 1.2 and a third chamber 1.3, and the throttling hole 3.2 runs through the first flow hole 3.1 and the second chamber 1.2.

[0033] A damper is a device that provides resistance to movement and dissipates the energy of movement. There are oil dampers, solid viscous dampers, air dampers, friction dampers, etc. The damper is mainly composed of a piston, a cylinder 1, and a liquid. The piston divides the cylinder into two parts. The piston moves in one direction under the action of an external force, and the liquid is squeezed, and the liquid flows to the other end of the piston through the hole on the piston. The damper is a device that provides resistance to movement and dissipates the energy of movement. Various dampers (or shock absorbers) have long been used in aerospace, aviation, military, guns, automobiles and other industries to reduce vibration and dissipate energy. A floating piston is set in the existing single-cylinder damper to improve the impact resistance and buffering performance of the damper. Due to the frequent reciprocating motion of the floating piston, there is a risk of leakage, thereby reducing the service life of the damper.

[0034] In order to solve the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper, a single-cylinder damper with reduced leakage risk and increased service life is provided. A single-cylinder damper described in the above embodiment solves the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper by fixing the piston 3. The fixed piston 3 is fixed in the cylinder body 1, so that the volume of the first chamber 1.1 is fixed, and the total volume of the second chamber 1.2 and the third chamber 1.3 is fixed. The sliding piston 2 is slidably arranged in the second chamber 1.2 and the third chamber 1.3. When the piston rod 7 is compressed into the cylinder body 1, the liquid in the cylinder body 1 where the second chamber 1.2 and the third chamber 1.3 are located enters the first chamber 1.1 and compresses the gas in the first chamber 1.1; when the piston rod 7 is stretched out of the cylinder body 1, the liquid in the first chamber 1.1 is replenished into the cylinder body where the second chamber 1.2 and the third chamber 1.3 are located, thereby completing the cycle. The fixed piston 3 is fixed in the cylinder body and does not need to move repeatedly, thus avoiding leakage and increasing the service life of the damper.

[0035] The lower end sliding sleeve of the fixed piston 3 is provided with a valve plate 4, and a throttle hole 3.2 is provided between the valve plate 4 and the fixed piston 3, and the throttle hole 3.2 passes through the first flow hole 3.1 and the second chamber 1.2.

[0036] Take the piston rod downward setting as an example:

[0037] When the piston rod 7 is compressed into the cylinder body 1, part of the liquid in the second chamber 1.2 enters the first chamber 1.1. At this time, the liquid in the second chamber 1.2 presses the valve plate 4 against the end of the sliding piston 2, that is, the valve plate 4 is pressed against the end of the first flow hole 3.1, and the liquid in the second chamber 1.2 enters the first chamber 1.1 through the throttle hole 3.2 and the first flow hole 3.1 in sequence. When the damper is compressed, the resistance is further increased, the compression speed of the piston rod 7 into the cylinder body 1 is slowed down, and the impact caused by the compression of the damper is prevented. The damper has the advantages of no lost motion, stable damping, and high resistance at low speed.

[0038] When the piston rod 7 is pulled out of the cylinder body 1, the liquid in the third chamber 1.3 enters the second chamber 1.2, and the liquid in the first chamber 1.1 enters the second chamber 1.2. At this time, the liquid in the first chamber 1.1 flushes the valve plate 4, so that the liquid in the first chamber 1.1 is quickly replenished into the second chamber 1.2, so that the damper has a fast oil replenishing speed, no lost travel, and stable damping.

[0039] A floating piston is provided in the existing single-cylinder damper to improve the impact resistance and buffering performance of the damper. Due to the frequent reciprocating motion of the floating piston, there is a risk of leakage, thereby reducing the service life of the damper. Through the cooperation of the fixed piston and the valve plate in this embodiment, this embodiment has the following beneficial effects: the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper is solved by fixing the piston 3; and the structure is simple, the oil replenishment speed is fast, there is no empty stroke, the damping is stable, there are high resistance at low speed, the accessories are universal, it is easy to buy in the market, and the batch cost is low. The problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper is solved, and a single-cylinder damper with reduced leakage risk and increased service life is provided.

[0040] Embodiment 2, as Figure 1 , Figure 2A single-cylinder damper shown in the figure comprises a cylinder body 1 and a sliding piston 2 driven in the cylinder body 1 by a piston rod 7, a fixed piston 3 is arranged in the cylinder body 1, the sliding piston 2 is located below the fixed piston 3, a first flow hole 3.1 is arranged on the fixed piston 3, a valve plate 4 is arranged on the sliding sleeve at the lower end of the fixed piston 3, a throttling hole 3.2 is arranged between the valve plate 4 and the fixed piston 3, the fixed piston 3 and the sliding piston 2 divide the cylinder body 1 from top to bottom into a first chamber 1.1, a second chamber 1.2 and a third chamber 1.3, and the throttling hole 3.2 passes through the first flow hole 3.1 and the second chamber 1.2. The single-cylinder damper described in the above embodiment solves the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper by the fixed piston 3. The fixed piston 3 is fixed in the cylinder body 1, so that the volume of the first chamber 1.1 is fixed, and the total volume of the second chamber 1.2 and the third chamber 1.3 is fixed. The sliding piston 2 is slidably arranged in the second chamber 1.2 and the third chamber 1.3. When the piston rod is compressed into the cylinder body, the liquid in the cylinder body where the second chamber and the third chamber are located enters the first chamber and compresses the gas in the first chamber; when the piston rod is stretched out of the cylinder body, the liquid in the first chamber is replenished into the cylinder body where the second chamber and the third chamber are located, thereby completing the cycle. The fixed piston is fixed in the cylinder body and does not need to move repeatedly, thereby avoiding leakage and increasing the service life of the damper. The lower end sliding sleeve of the fixed piston 3 is provided with a valve plate 4, and a throttling hole 3.2 is provided between the valve plate 4 and the fixed piston 3, and the throttling hole 3.2 passes through the first flow hole 3.1 and the second chamber 1.2.

[0041] Further, such as Figure 1 , Figure 2 As shown, a limiting portion 5 is provided at the lower end of the fixed piston 3, and the limiting portion 5 limits the valve plate 4 at the lower end of the fixed piston 3. The limiting portion 5 is used to limit the valve plate 4 at the lower end of the fixed piston 3. A guide portion is provided at the lower end of the fixed piston 3, and the valve plate 4 is sleeved on the guide portion and moves along the central axial direction of the fixed piston 3.

[0042] Furthermore, the fixing method between the fixed piston 3 and the cylinder body 1 is optimized, such as Figure 1 , Figure 2 As shown, the inner wall of the cylinder body 1 is provided with a limiting protrusion 1.4, and the side wall of the fixed piston 3 is provided with a limiting groove 3.3, and the limiting protrusion 1.4 cooperates with the limiting groove 3.3. The limiting protrusion 1.4 cooperates with the limiting groove 3.3, so that the fixed piston 3 is fixed to the inner wall of the cylinder body 1 to prevent the fixed piston 3 from sliding when the damper is running. Figure 1 , Figure 2As shown, a first sealing ring 6 is disposed in the limiting groove 3.3, and the limiting protrusion 1.4 presses the first sealing ring 6 into the limiting groove 3.3. The first sealing ring 6 enhances the sealing performance and stability between the fixed piston 3 and the inner wall of the cylinder body 1.

[0043] Furthermore, the connection method between the fixed piston 3 and the valve plate 4 is optimized, such as Figure 1 , Figure 2 As shown, the limiting part 5 is a bolt, the rod of the bolt is tightened on the fixed piston 3, and the head of the screw limits the valve plate 4 on the fixed piston 3. The bolt includes a rod and a head, the rod of the bolt plays a connecting and fixing role, and the head of the bolt plays a limiting role.

[0044] In this embodiment, Figure 1 , Figure 2 As shown, the sliding piston 2 is provided with a second flow hole, and the second flow hole passes through the second chamber 1.2 and the third chamber 1.3.

[0045] Furthermore, the piston rod 7 is further optimized, such as Figure 1 , Figure 2 As shown, the piston rod 7 passes through the lower end of the cylinder body 1 and is connected to the sliding piston. The piston rod 7 is slidably arranged at the lower end of the cylinder body through a guide sleeve. The piston rod 7 is arranged downward, so that the damper has no idle travel during the stretching process and the compression process. When the piston rod is compressed into the cylinder body, part of the liquid in the second chamber enters the first chamber, and the other part of the liquid enters the third chamber, compressing the gas in the first chamber to provide volume; when the piston rod is stretched out of the cylinder body, the liquid in the third chamber is replenished into the second chamber, and the liquid in the first chamber is replenished into the second chamber, and the gas expands to provide power for the liquid, thereby completing the cycle.

[0046] In this embodiment, Figure 1 , Figure 2 As shown, a sealing groove is provided on the side wall of the sliding piston 2, and a second sealing ring is provided in the sealing groove. The second sealing ring improves the sealing effect between the sliding piston 2 and the inner wall of the cylinder body 1.

[0047] Furthermore, the throttle hole is further optimized, and there are two implementation methods of the throttle hole:

[0048] Embodiment 1: The throttle hole 3.2 comprises a throttle groove arranged on the lower end surface of the fixed piston, and the throttle groove and the valve plate form the throttle hole 3.2. The cross-sectional area of ​​the throttle hole 3.2 is smaller than the cross-sectional area of ​​the first flow hole 3.1.

[0049] Embodiment 2: the throttle hole 3.2 is located on the valve plate, and the cross-sectional area of ​​the throttle hole 3.2 is smaller than the cross-sectional area of ​​the first flow hole 3.1.

[0050] Specifically, Figure 1 , Figure 2 As shown, the total volume of the second chamber 1.2 and the third chamber 1.3 is fixed. The problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper is solved by fixing the piston 3. The fixed piston 3 is fixed in the cylinder body 1, so that the volume of the first chamber 1.1 is fixed, and the total volume of the second chamber 1.2 and the third chamber 1.3 is fixed.

[0051] Specifically, Figure 1 , Figure 2 As shown, the cylinder 1 is filled with oil and air or high-pressure gas at the same time, the oil fills the second chamber 1.2 and the third chamber 1.3, and there is oil in the first chamber 1.1. The air or high-pressure gas is always in the first chamber 1.1.

[0052] Working principle of damper with piston rod downward setting:

[0053] When the piston rod 7 is compressed into the cylinder body 1, part of the liquid in the second chamber 1.2 enters the first chamber 1.1. At this time, the liquid in the second chamber 1.2 presses the valve plate 4 against the end of the sliding piston 2, that is, the valve plate 4 is pressed against the end of the first flow hole 3.1, and the liquid in the second chamber 1.2 enters the first chamber 1.1 through the throttle hole 3.2 and the first flow hole 3.1 in sequence. When the damper is compressed, the resistance is further increased, the compression speed of the piston rod 7 into the cylinder body 1 is slowed down, and the impact caused by the compression of the damper is prevented. The damper has the advantages of no idle travel in stretching or compression, stable damping, and high resistance at low speed.

[0054] When the piston rod 7 is pulled out of the cylinder body 1, the liquid in the third chamber 1.3 enters the second chamber 1.2, and the liquid in the first chamber 1.1 enters the second chamber 1.2. At this time, the liquid in the first chamber 1.1 flushes the valve plate 4, so that the liquid in the first chamber 1.1 is quickly replenished into the second chamber 1.2, so that the damper has a fast oil replenishing speed, no lost travel, and stable damping.

[0055] A floating piston is provided in the existing single-cylinder damper to improve the impact resistance and buffering performance of the damper. Due to the frequent reciprocating motion of the floating piston, there is a risk of leakage, thereby reducing the service life of the damper. Through the cooperation of the fixed piston and the valve plate in this embodiment, this embodiment has the following beneficial effects: the problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper is solved by fixing the piston 3; and the structure is simple, the oil replenishment speed is fast, there is no empty stroke, the damping is stable, there are high resistance at low speed, the accessories are universal, it is easy to buy in the market, and the batch cost is low. The problem that the reciprocating motion of the floating piston in the existing single-cylinder damper increases the risk of leakage and reduces the service life of the damper is solved, and a single-cylinder damper with reduced leakage risk and increased service life is provided.

[0056] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-cylinder damper, comprising a cylinder body and a sliding piston driven in the cylinder body by a piston rod, characterized in that: A fixed piston is provided in the cylinder body, the sliding piston is located below the fixed piston, a first flow hole is provided on the fixed piston, a valve sheet is provided on the sliding sleeve at the lower end of the fixed piston, a throttling hole is provided between the valve sheet and the fixed piston, the fixed piston and the sliding piston divide the cylinder body into a first chamber, a second chamber and a third chamber from top to bottom, and the throttling hole runs through the first flow hole and the second chamber.

2. A single-cylinder damper according to claim 1, characterized in that: A limiting portion is provided at the lower end of the fixed piston, and the limiting portion limits the valve plate at the lower end of the fixed piston.

3. A single-cylinder damper according to claim 2, characterized in that: A limiting protrusion is provided on the inner wall of the cylinder body, and a limiting groove is provided on the side wall of the fixed piston, and the limiting protrusion cooperates with the limiting groove.

4. A single-cylinder damper according to claim 3, characterized in that: A first sealing ring is arranged in the limiting groove, and the limiting protrusion presses the first sealing ring tightly in the limiting groove.

5. A single-cylinder damper according to claim 2, 3 or 4, characterized in that: The limiting part is a bolt, the rod of the bolt is tightened on the fixed piston, and the head of the bolt limits the valve plate on the fixed piston.

6. A single-cylinder damper according to claim 1, 2, 3 or 4, characterized in that: The sliding piston is provided with a second flow hole, and the second flow hole passes through the second chamber and the third chamber.

7. A single-cylinder damper according to claim 1, 2, 3 or 4, characterized in that: The piston rod passes through the lower end of the cylinder body and is connected with the sliding piston. The piston rod is slidably arranged at the lower end of the cylinder body through a guide sleeve.

8. A single-cylinder damper according to claim 1, 2, 3 or 4, characterized in that: The throttling hole comprises a throttling groove arranged on the lower end surface of the fixed piston, and the throttling groove and the valve plate form a throttling hole.

9. A single-cylinder damper according to claim 1, 2, 3 or 4, characterized in that: The throttling hole is located on the valve plate, and the cross-sectional area of ​​the throttling hole is smaller than the cross-sectional area of ​​the first flow hole.

10. A single-cylinder damper according to claim 9, characterized in that: The cylinder body is filled with oil and air or high-pressure gas at the same time. The oil fills the second chamber and the third chamber, and there is oil in the first chamber.

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