TWM600812U - Shock absorber - Google Patents

Abstract

This creation is about a shock absorber, including: a shell, a buffer mechanism, a pressure relief channel and a pressure relief stop component. The buffer mechanism is arranged in the casing, and the buffer mechanism includes an air storage chamber and an oil chamber. When the shock absorber is compressed, the air storage chamber is compressed and reduced accordingly. When the shock absorber is extended, the air storage chamber is expanded and expanded accordingly; wherein, when the shock absorber is in a compressed state If the internal oil pressure is too high, part of the oil body can flow into the pressure relief channel to release the pressure through the pressure relief stop component.

Description

Shock Absorbers

This creation is related to shock absorbers.

The shock absorber is one of the important devices necessary for the car body. It is mainly used to absorb the impulse of the car body continuously shaking up and down as the road bumps during travel, thereby making the rider have a more comfortable ride. Among them, the shock absorber mainly converts the impulse into heat energy and consumes it through the resistance generated by the internal oil body flowing through various components (such as pistons, orifices), thereby achieving the purpose of buffering and shock absorption.

However, most of the shock absorbers on the market today have fixed shock absorption performance, and the rider cannot immediately change and adjust the damping size according to their own preferences, resulting in the inability to feel comfortable during riding. In other words, the current shock absorber structure cannot truly meet the needs of users. Therefore, it is necessary to provide a novel and progressive shock absorber to solve the above-mentioned problems.

The main purpose of this creation is to provide a shock absorber, which can effectively absorb shock through the compression and expansion of the air storage chamber and has better safety. In addition, the rider can adjust the damping size by changing the air pressure according to his own habits, which is quite convenient and fast. In addition, when the internal oil pressure is too high, the internal oil body can be discharged to the outside through the pressure relief channel to achieve the purpose of explosion-proof.

In order to achieve the above-mentioned objective, this invention provides a shock absorber, which includes: a housing, a buffer mechanism, a pressure relief channel, and a pressure relief stop component. The housing includes a first outer tube and a second outer tube connected to each other with a sliding sleeve, and the inside of the first outer tube and the inside of the second outer tube communicate with each other to jointly form an internal space; the buffer mechanism It includes a damping unit and a pushing unit. The damping unit includes an inner cylinder assembly, a floating piston and an oil-through valve body. The inner cylinder assembly includes a first inner cylinder and a second inner cylinder. The cylinder is positioned inside the first outer tube, the oil passage valve body is positioned in the first inner cylinder and divides it into a first chamber and a second chamber, and the floating piston is movably accommodated in the first chamber. A chamber is divided into a gas storage chamber and an oil chamber that are not connected to each other. The gas storage chamber is pre-stored with a certain pressure of gas. The oil chamber and the second chamber are connected by the oil passage valve body. Can be selectively communicated with each other, one end of the second inner cylinder is connected to the first inner cylinder to communicate with the second chamber, the second inner cylinder is for storing oil bodies, and one end of the pushing unit is positioned at the second Inside the outer tube, the other end of the pushing unit is movably inserted into the other end of the second inner cylinder for pushing against the oil body; the pressure relief channel is formed through the inner cylinder assembly, and one end of the pressure relief channel is used for In order to communicate with at least one of the oil chamber, the second chamber and the second inner cylinder, the other end of the pressure relief passage is used to communicate with the internal space; the pressure relief stop component is arranged on the inner cylinder component and is normal Groundly block the pressure relief passage. When the oil pressure in the oil chamber, the second chamber and the second inner cylinder rises to a preset pressure, part of the oil body enters the internal space through the pressure relief stop assembly. Decrease the oil pressure of the oil chamber, the second chamber and the second inner cylinder; wherein, when the shock absorber is compressed, the first outer tube and the second outer tube are relatively close, and the pushing unit The oil body in the second inner cylinder is driven into the oil chamber through the oil passage valve body to push the floating piston to move away from the oil passage valve body, thereby compressing the space of the air storage chamber; wherein, when the When the shock absorber is extended, the gas located in the air storage chamber pushes the floating piston to move toward the direction of the oil passage valve body to compress the space of the oil chamber, and then drives the oil body to return to the oil passage through the oil passage valve body. The second inner cylinder pushes the pushing unit so that the first pipe and the second pipe are relatively far away.

The following examples are only used to illustrate the possible implementation of this creation, but it is not intended to limit the scope of the creation to be protected, and it is first stated.

Please refer to FIGS. 1 to 10, which show an embodiment of the invention. The shock absorber of the invention includes: a housing 1, a buffer mechanism 2, a pressure relief channel 81, and a pressure relief stop component 82.

The housing 1 includes a first outer tube 11 and a second outer tube 12 connected to each other by sliding sleeves. The inside of the first outer tube 11 and the inside of the second outer tube 12 are connected to each other to form an interior together. Space 13; In this embodiment, the radial dimension of the first outer tube 11 is greater than the radial dimension of the second outer tube 12.

The buffer mechanism 2 includes a damping unit 21 and a pushing unit 22. The damping unit 21 includes an inner cylinder assembly 3, a floating piston 33 and an oil-through valve body 34.

The inner tube assembly 3 includes a first inner tube 31 and a second inner tube 32. The first inner tube 31 is positioned inside the first outer tube 11. In this embodiment, the first inner tube 31 is screwed on The first outer tube 11 is convenient for assembly. The oil passage valve body 34 is positioned in the first inner cylinder 31 and divided into a first chamber 311 and a second chamber 314. The floating piston 33 is movably accommodated in the first chamber 311 and It is divided into a gas storage chamber 312 and an oil chamber 313 that are not connected to each other. The gas storage chamber 312 is used for pre-stored gas with a certain pressure. The gas is preferably nitrogen, which has the advantages of good stability and non-flammability. Wherein, the oil chamber 313 and the second chamber 314 can be selectively communicated with each other through the oil passage valve body 34, and one end of the second inner cylinder 32 is connected to the first inner cylinder 31 to communicate with the second cavity In the chamber 314, the second inner cylinder 32 is provided with oil (such as damping oil with better viscosity), one end of the pushing unit 22 is positioned inside the second outer tube 12, and the other of the pushing unit 22 The end is movably inserted into the other end of the second inner cylinder 32 for pushing against the oil body.

In more detail, when the shock absorber is compressed, the first outer tube 11 and the second outer tube 12 are relatively close, and the pushing unit 22 drives the oil in the second inner cylinder 32 to pass through the oil The passage valve body 34 enters the oil chamber 313 to push the floating piston 33 to move away from the oil passage valve body 34 to compress the space of the air storage chamber 312. Conversely, when the shock absorber is stretched, the gas located in the air storage chamber 312 pushes the floating piston 33 toward the direction of the oil passage valve body 34 to compress the space of the oil chamber 313, thereby driving the oil body through The oil passage valve body 34 flows back to the second inner cylinder 32 to push the pushing unit 22 so that the first pipe and the second pipe are relatively far away.

It should be emphasized that the pressure relief channel 81 is formed through the inner cylinder assembly 3, and one end of the pressure relief channel 81 is used to communicate with at least one of the oil chamber 313, the second chamber 314, and the second inner cylinder 32 Moreover, the other end of the pressure relief channel 81 is used to communicate with the internal space 13. The pressure relief stop component 82 is provided on the inner cylinder assembly 3 and normally blocks the pressure relief passage 81. When the oil pressure in the oil chamber 313, the second chamber 314, and the second inner cylinder 32 rises When the preset pressure is reached, part of the oil body can be driven by the pressure to enter the internal space 13 through the pressure relief stop assembly 82 so that the oil pressure of the oil chamber 313, the second chamber 314 and the second inner cylinder 32 The lowering enables the oil pressure of the oil chamber 313, the second chamber 314 and the second inner cylinder 32 to be maintained within a safe value, so as to effectively prevent the explosion caused by excessive oil pressure.

In this embodiment, the damping unit 21 further includes an oil seal seat 6 for connecting the first inner cylinder 31 and the second inner cylinder 32, and has a better connection and sealing degree and facilitates assembly. A pressure relief channel 81 is formed through the oil seal seat 6 to communicate the second chamber 314 and the internal space 13, and the pressure relief stop component 82 is positioned and sleeved on the second inner cylinder 32 to normally cover and block The opening of the pressure relief channel 81. More specifically, the pressure relief blocking component 82 includes a positioning kit 821 and a plurality of second sheets 822 in a stacked configuration, and the plurality of second sheets 822 are sleeved on the second inner cylinder 32 to cover and block the leakage. To press the opening of the channel 81, the positioning sleeve 821 is screwed to the second inner cylinder 32, and the plurality of second sheets 822 are clamped between the positioning sleeve 821 and the oil seal seat 6.

Preferably, the shock absorber further includes an exhaust assembly 7 provided with an exhaust passage 71 and a stopper 72 that penetrates the first inner cylinder 31, and the exhaust passage 71 communicates with In the internal space 13, the blocking member 72 is provided in the exhaust passage 71 to block it from communicating with the outside. When the rider feels that the relative movement of the first outer tube 11 and the second outer tube 12 is not smooth, the stopper 72 can be removed to allow the excess air in the inner space 13 to be discharged, so that it can Reduce the pressure to the appropriate pressure.

Preferably, the damping unit 21 is additionally provided with an air adjustment mechanism 51. The air adjustment mechanism 51 includes an air passage 511 and an air valve 512. The air passage 511 is provided in the first inner cylinder 31 to communicate with the outside and the The gas storage chamber 312, the gas valve 512 is arranged in the gas passage 511 to selectively block the gas storage chamber 312 from communicating with the outside; wherein, the gas volume in the gas storage chamber 312 can be changed through the gas passage 511, thereby The air pressure of the air storage chamber 312 is adjusted to produce different damping effects. For example, when the air pressure of the air storage chamber 312 is high, the first outer tube 11 and the second outer tube 12 approach each other slowly (commonly known as the shock absorber is harder), and require a greater impulse to actuate The shock absorber is compressed; on the contrary, when the air pressure of the air storage chamber 312 is low, the first outer tube 11 and the second outer tube 12 approach each other quickly (commonly known as the shock absorber is softer), and only a small impulse is needed. The shock absorber can be activated to compress.

The damping unit 21 further includes a communicating tube 52 which is coaxially arranged with the inner cylinder assembly 3, the communicating tube 52 is positioned inside the first inner cylinder 31, and at least A fluid passage 521, the at least one fluid passage 521 communicates with the oil chamber 313 and the inside of the second inner cylinder 32, the floating piston 33 is slidably sleeved on the communicating pipe 52, and the oil passage valve body 34 is positioned in a sleeve Connected to the communicating pipe 52. In this embodiment, the communicating tube 52 is screwed in the first inner cylinder 31 to facilitate assembly and disassembly; and the number of the at least one fluid channel 521 is two, and the second fluid channel 521 can provide even oil It circulates between the oil chamber 313 and the inside of the second inner cylinder 32.

Preferably, the damping unit 21 further includes an oil adjustment mechanism 53 which includes an adjustment rod needle 531 and an adjustment port 534, the adjustment port 534 is transversely disposed inside the communication tube 52 and communicates with the first Two inner cylinders 32 and two fluid channels 521, the adjusting rod needle 531 is movably inserted into the communication tube 52 for external manipulation, and a top 532 of the adjusting rod needle 531 can selectively penetrate the The adjustment opening 534 is used to change the radial opening size of the adjustment opening 534. In this way, the compression damping can also be adjusted by changing the size of the adjustment opening 534. When the opening of the adjustment opening 534 is smaller, the compression damping is larger, and the speed of the liquid returning to the second inner cylinder 32 is slower; When the opening of the regulating port 534 is larger, the compression damping is smaller, and the speed of the liquid returning to the second inner cylinder 32 is faster. It is understandable that the oil adjusting mechanism 53 and the air adjusting mechanism 51 can double-adjust the compression damping, which can achieve a wider adjustment range and finer adjustments.

In this embodiment, the oil adjusting mechanism 53 is further provided with an adjusting tube 533 and a second elastic member 536. The adjusting tube 533 is positioned inside the communicating tube 52, and the adjusting tube 533 faces the air storage chamber 312. One side is provided with the adjusting port 534, the adjusting tube 533 is provided with a connecting port 535 on the side facing away from the air storage chamber 312, the connecting port 535 is connected to the second inner cylinder 32, and the second elastic member 536 springs against Between the edge of the adjusting opening 534 and the adjusting rod needle 531, the top 532 tends to be away from the adjusting opening 534 normally. More specifically, the oil adjustment mechanism 53 is additionally provided with a knob 537 and a screw 538 for external rotation. The knob 537 and the screw 538 are in the same rotation relationship, and the knob 537 is rotatably positioned at The first inner cylinder 31, the screw 538 is movably screwed between the adjusting rod needle 531 and the knob 537, and the adjusting rod needle 531 is sandwiched between the screw 538 and the second elastic member 536. between.

It is worth mentioning that the oil passage valve body 34 has a first side portion 341 facing the air storage chamber 312, a second side portion 342 facing the second inner cylinder 32, and a plurality of compression The flow passages 343 and the plural rebound flow passages 344, the plural compression flow passages 343 and the plural rebound flow passages 344 are alternately arranged in the circumferential direction and do not communicate with each other, and a first cover assembly 41 is provided on the first side portion 341 And only shields the plurality of compression flow passages 343 without shielding the plurality of rebound flow passages 344, a second covering component 42 is provided on the second side portion 342 and only covers the plurality of rebound flow passages 344 without shielding the The plural compression runners 343.

Specifically, the first covering element 41 includes a plurality of first sheets 411 in a stacked configuration, and the second covering element 42 is provided with a first elastic member 421, a base 422, and a valve plate 423. The base 422 Positioned at the communicating pipe 52, the valve plate 423 is movably sleeved on the communicating pipe 52, and the first elastic member 421 springs between the base 422 and the valve plate 423, thereby making the valve plate 423 normal The ground covers the plurality of rebound flow passages 344. More specifically, when the shock absorber is compressed and the oil body reaches a predetermined pressure, the oil body moves in the direction of the air storage chamber 312 to push the first cover assembly 41 to open (the plurality of first sheets 411 are deflected) Curved open), the oil body can enter the oil chamber 313 through the plurality of compression flow passages 343 and the communication pipe 52; when the shock absorber is extended, the oil body moves in a direction away from the air storage chamber 312 to push the first The second cover assembly 42 is opened (the first elastic member 421 is compressed, and the valve plate 423 retracts away from the plurality of rebound flow passages 344 to open), and the oil body can flow back to the plurality of rebound flow passages 344 and the connecting pipe 52 The second inner tube 32.

To sum up, the shock absorber of this creation separates the air storage chamber and the oil chamber of variable size through the floating piston, and can quickly reflect the compression stroke and extension stroke. In addition, a pressure relief channel and a pressure relief stop component are also designed to timely discharge the internal oil body and have the effect of reducing oil pressure, which can achieve the purpose of explosion protection. In addition, the user can double-adjust the size of the compression damping through the air adjustment mechanism and the oil adjustment mechanism, which can provide more diversified and more appropriate shock absorption effects according to different environments.

1: shell 11: The first outer tube 12: The second outer tube 13: Internal space 2: buffer mechanism 21: Damping unit 22: Push unit 3: Inner cylinder assembly 31: The first inner cylinder 311: First Chamber 312: air storage chamber 313: oil chamber 314: second chamber 32: second inner cylinder 33: Floating piston 34: Oil through valve body 341: first side 342: second side 343: Compression runner 344: rebound runner 41: The first cover component 411: first slice 42: second cover assembly 421: The first elastic part 422: Pedestal 423: Valve 51: Air conditioning mechanism 511: Gas Channel 512: Valve 52: connecting pipe 521: Fluid Channel 53: Oil adjustment mechanism 531: Adjustment Rod Needle 532: top 533: regulating tube 534: adjustment port 535: connection port 536: second elastic part 537: Kick 538: Screw 6: Oil seal seat 7: Exhaust components 71: exhaust channel 72: stop 81: Pressure relief channel 82: Pressure relief stop component 821: positioning kit 822: second slice

Figure 1 is a perspective view of an embodiment of the creation. Figure 2 is a partial exploded view of Figure 1; Figure 3 is another perspective view of the oil passage valve body. Figure 4 is a schematic diagram of the use of shock absorbers. Figure 5 is a partial enlarged view of the shock absorber being compressed. Figure 6 is a partial enlarged view of the shock absorber being stretched. Figure 7 is a flow diagram of oil when the shock absorber is compressed. Figure 8 is a flow diagram of the oil body when the shock absorber is stretched. 9 and 10 are schematic diagrams of the operation of the pressure relief channel and the pressure relief stop assembly.

31: The first inner cylinder

32: second inner cylinder

33: Floating piston

34: Oil through valve body

343: Compression runner

344: rebound runner

411: first slice

42: second cover assembly

421: The first elastic part

422: Pedestal

423: Valve

52: connecting pipe

521: Fluid Channel

53: Oil adjustment mechanism

531: Adjustment Rod Needle

532: top

533: regulating tube

536: second elastic part

6: Oil seal seat

821: positioning kit

822: second slice

Claims (10)

A shock absorber, including: A housing including a first outer tube and a second outer tube connected to each other with a sliding sleeve, and the inside of the first outer tube and the inside of the second outer tube are communicated with each other to jointly form an internal space; A buffer mechanism includes a damping unit and a pushing unit. The damping unit includes an inner cylinder assembly, a floating piston and an oil valve body. The inner cylinder assembly includes a first inner cylinder and a second inner cylinder, The first inner tube is positioned inside the first outer tube, the oil passage valve body is positioned in the first inner tube and divides it into a first chamber and a second chamber, and the floating piston is movably contained Set in the first chamber and divide it into a gas storage chamber and an oil chamber that are not connected to each other. The gas storage chamber supplies gas with a certain pressure pre-stored, and the oil chamber and the second chamber pass through the oil The valve body can be selectively communicated with each other. One end of the second inner cylinder is connected to the first inner cylinder and then communicates with the second chamber. The second inner cylinder stores oil bodies. One end of the pushing unit is positioned Inside the second outer tube, the other end of the pushing unit is movably inserted into the other end of the second inner cylinder for pushing against the oil body; A pressure relief channel penetrates the inner cylinder assembly. One end of the pressure relief channel is used to communicate with at least one of the oil chamber, the second chamber and the second inner cylinder. The other end of the pressure relief channel is used for To communicate with the internal space; and A pressure relief stop component is arranged on the inner cylinder assembly and normally blocks the pressure relief passage. When the oil pressure in the oil chamber, the second chamber and the second inner cylinder rises to a preset pressure, Part of the oil body enters the internal space through the pressure relief stop component to reduce the oil pressure of the oil chamber, the second chamber and the second inner cylinder; Wherein, when the shock absorber is compressed, the first outer tube and the second outer tube are relatively close, the pushing unit drives the oil body in the second inner cylinder to enter the oil chamber through the oil passage valve body, To push the floating piston to move away from the oil passage valve body, thereby compressing the space of the air storage chamber; Wherein, when the shock absorber is stretched, the gas located in the air storage chamber pushes the floating piston to move toward the direction of the oil passage valve body to compress the space of the oil chamber, and then drives the oil body through the oil passage valve The body flows back to the second inner cylinder to push the pushing unit, so that the first tube and the second tube are relatively far away. The shock absorber according to claim 1, wherein the damping unit is additionally provided with an air regulating mechanism, the air regulating mechanism includes a gas passage and a gas valve, and the gas passage is provided in the first inner cylinder to communicate with the outside and the storage The gas chamber, the gas valve is arranged in the gas channel to selectively block the gas storage chamber from communicating with the outside. The shock absorber according to claim 1, wherein the damping unit further includes a communicating tube, the communicating tube and the inner cylinder assembly are arranged coaxially, and the communicating tube is positioned inside the first inner cylinder and connected to the The pipe is provided with at least one fluid passage, the at least one fluid passage communicates with the oil chamber and the inside of the second inner cylinder, the floating piston is slidably sleeved on the communicating pipe, and the oil passage valve body is positioned sleeved on The connecting pipe. The shock absorber according to claim 3, wherein the oil passage valve body is provided with a first side portion facing the air storage chamber, a second side portion facing the second inner cylinder, and a plurality of Compression flow passages and plural rebound flow passages, the plural compression flow passages and the plural rebound flow passages are alternately arranged in the circumferential direction and do not communicate with each other, and a first cover component is provided on the first side and only covers the A plurality of compression flow channels without shielding the plurality of rebounding flow channels, a second covering component is provided on the second side and only shielding the plurality of rebounding flow channels without shielding the plurality of compression flow channels, the second covering assembly A first elastic member, a base, and a valve plate are provided. The base is positioned on the communicating pipe, the valve plate is movably sleeved on the communicating pipe, and the first elastic member springs against the base and the Between the valve plates, the valve plates normally cover the plurality of rebound flow channels; wherein, when the shock absorber is compressed and the oil body reaches a predetermined pressure, the oil body moves toward the air storage chamber Then the first cover assembly is pushed to open, and the oil body can enter the oil chamber through the plurality of compression flow passages and the connecting pipe; when the shock absorber is extended, the oil body moves in a direction away from the air storage chamber to push the The second cover assembly is opened, and the oil body can flow back to the second inner cylinder through the plurality of rebound flow passages and the communication pipe. The shock absorber according to claim 3, wherein the damping unit further includes an oil adjustment mechanism, the oil adjustment mechanism includes an adjustment rod needle and an adjustment port, the adjustment port being arranged horizontally inside the communicating tube and communicating with the The second inner cylinder and the at least one fluid channel, the adjusting rod needle is movably inserted into the communication tube for external manipulation, and the top of the adjusting rod needle can be selectively pierced through the adjusting port to change The radial opening size of the adjusting port. The shock absorber according to claim 5, wherein the oil adjustment mechanism is further provided with an adjusting tube and a second elastic member, the adjusting tube is positioned inside the communicating tube, and the adjusting tube faces one of the air storage chambers The side is provided with the adjusting port, the adjusting tube is provided with a connecting port on the side facing away from the air storage chamber, the connecting port is connected with the second inner cylinder, and the second elastic member springs against the edge of the adjusting port and the Between the adjustment rod needles, the top part normally has a tendency to be far away from the adjustment opening. The shock absorber according to claim 6, wherein the oil adjustment mechanism is additionally provided with a knob and a screw for external rotation, the knob and the screw are in a co-rotating relationship, and the knob is rotatably positioned In the first inner cylinder, the screw is movably screwed between the adjusting rod needle and the knob, and the adjusting rod needle is sandwiched between the screw and the second elastic member. The shock absorber according to any one of claims 1 to 7, wherein the damping unit further includes an oil seal seat for connecting the first inner cylinder and the second inner cylinder, and the pressure relief channel penetrates The oil seal seat is arranged on the oil seal seat to communicate the second chamber and the internal space, and the pressure relief blocking component is positioned and sleeved on the second inner cylinder to normally cover and block the opening of the pressure relief channel. The shock absorber according to claim 8, wherein the pressure relief blocking component includes a positioning kit and a plurality of second sheets in a stacked configuration, and the plurality of second sheets are sleeved on the second inner tube to cover the blocking For the opening of the pressure relief channel, the positioning sleeve is screwed to the second inner cylinder, and the plurality of second sheets are clamped between the positioning sleeve and the oil seal seat. The shock absorber according to claim 7, wherein the damping unit is additionally provided with an air regulating mechanism, the air regulating mechanism includes a gas passage and a gas valve, and the gas passage is provided in the first inner cylinder to communicate with the outside and the storage An air chamber, the air valve is arranged in the gas passage to selectively block the air storage chamber from communicating with the outside; the oil passage valve body is provided with a first side facing the air storage chamber and a second inner cylinder The second side part and the axial direction are provided with a plurality of compression flow channels and a plurality of rebound flow channels, the plurality of compression flow channels and the plurality of rebound flow channels are alternately arranged in the circumferential direction and are not connected to each other, a first cover The component is arranged on the first side and only covers the plurality of compression flow channels without shielding the plurality of rebound flow channels, and a second covering component is provided on the second side and only covers the plurality of rebound flow channels. The plurality of compressed flow passages are not shielded, the second covering assembly is provided with a first elastic member, a base and a valve plate, the base is positioned on the communicating pipe, and the valve plate is movably sleeved on the communicating pipe, The first elastic member elastically abuts between the base and the valve plate, so that the valve plate normally covers the plurality of rebound flow passages; wherein, when the shock absorber is compressed and the oil body reaches a predetermined value Under pressure, the oil body moves in the direction of the air storage chamber to push the first cover assembly to open. The oil body can enter the oil chamber through the plurality of compression flow passages and the connecting pipe; when the shock absorber is extended, the oil The body moves in a direction away from the air storage chamber to push the second cover assembly to open, and the oil body can flow back to the second inner cylinder through the plurality of rebound flow passages and the communication pipe; the shock absorber further includes an exhaust Assembly, the exhaust assembly is provided with an exhaust passage through the first inner cylinder and a stopper, the exhaust passage communicates with the internal space, and the stopper is arranged on the exhaust passage to block it from communicating with the outside ; The damping unit further includes an oil seal seat for connecting the first inner tube and the second inner tube, the pressure relief passage is formed through the oil seal seat to communicate the second chamber and the internal space, The pressure relief blocking component is positioned and sleeved on the second inner cylinder to normally cover and block the opening of the pressure relief channel; the number of the at least one fluid channel is two; the communicating tube is screwed in the first inner cylinder The radial dimension of the first outer tube is greater than the radial dimension of the second outer tube; the first inner tube is screwed on the first outer tube; the first cover assembly includes a plurality of first sheets in a stacked configuration The pressure relief blocking component includes a positioning kit and a plurality of second sheets in a stacked configuration, the plurality of second sheets are sleeved on the second inner cylinder to cover the opening of the pressure relief channel, the positioning kit screw Connected to the second inner cylinder, the plurality of second sheets are clamped between the positioning sleeve and the oil seal seat.

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