Bicycle shock absorber

Abstract

The application discloses a bicycle shock absorber which comprises an outer tube, an inner tube and a rebound piston, the inner tube is slidingly sealed in the outer tube, a piston rod is arranged in the outer tube and an end of the piston rod is fixed with the rebound piston, the rebound piston is slidingly sealed in the inner tube, the rebound piston comprises a piston block and a screw, the piston block and the screw are both provided with a center hole, the screw is connected in the center hole of the piston block, a plurality of oil flow grooves are arranged on the screw, a plurality of through holes and a flow guide groove connected between the through holes and the oil flow grooves are arranged on the piston block, an oil outlet hole is arranged on the piston rod, and the oil outlet hole is communicated with the oil flow grooves.

Description

Technical Field

[0001] This invention relates to the field of bicycles, and more specifically to a bicycle shock absorber. Background Technology

[0002] Bicycle saddles are mounted on metal tubes that are inserted into the bicycle's stem. These metal tubes serve only a supporting function and do not provide damping or shock absorption. To ensure a comfortable riding experience on uneven terrain such as mountainous areas, and to prevent structural damage from such terrain, shock absorbers need to be installed in appropriate locations on the bicycle. These absorbers can reduce most of the impact forces during riding.

[0003] Existing shock absorbers, such as the one disclosed in patent document CN115596794A, include a cylinder, a double sealing assembly, an air chamber inflation assembly, a piston rod, a shock-absorbing piston, a floating piston, a gear adjustment assembly, and a rotary rod assembly. The adjusting valve core is threaded to the inner wall of the piston rod through-hole, and an axial groove is formed on the inner wall of the piston rod through-hole at the corresponding position of the gear position hole. This shock absorber achieves damping through damping oil, and the gear position is adjusted via the adjusting valve core, resulting in a lightweight, stable, and highly precise effect. However, during compression and extension, the damping oil shares a single oil passage, which can easily lead to blockage of the damping oil, thus affecting the damping effect. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a bicycle shock absorber that can avoid the problem of damping oil blockage during shock absorber operation, thereby improving the structural reliability of the shock absorber.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A bicycle shock absorber includes an outer tube, an inner tube, and a rebound piston. The inner tube is slidably sealed within the outer tube. A piston rod is disposed within the outer tube, and the rebound piston is fixed to the end of the piston rod. The rebound piston is slidably sealed within the inner tube. The rebound piston includes a piston block and a screw. Both the piston block and the screw have a central hole. The screw is connected to the central hole of the piston block. The screw has multiple oil grooves. The piston block has multiple through holes and a guide groove connecting the through holes and the oil grooves. The piston rod has an oil outlet hole that communicates with the oil grooves. Valve plates are fixedly connected to both ends of the piston block. When the valve plates are in a neutral state, they seal the through holes. When the valve plates are in an elastic state, they open the through holes. The piston rod has an adjustment hole along its central axis. A pin that can move along its axis is disposed in the adjustment hole. When the pin moves, it blocks or opens the central hole of the screw.

[0007] As a further improvement to the above technical solution, the screw includes a connecting section and a fixing section. The diameter of the connecting section is smaller than the diameter of the fixing section. The connecting section is connected to the central hole of the piston block and the oil flow groove is provided on the connecting section. A nut is connected to the fixing section, and the nut presses a valve plate against the bottom of the piston block.

[0008] As a further improvement to the above technical solution, the bottom end of the piston rod is provided with a constricted section, the constricted section is fixedly connected to the central hole of the piston block, the connecting section is connected to the inside of the constricted section, and the top of the constricted section has a stepped portion, the stepped portion pressing the other valve plate against the top of the piston block.

[0009] As a further improvement to the above technical solution, an elastic element is provided between the ejector pin and the adjustment hole, and the elastic element provides a pre-pressure to make the ejector pin abut against the center hole of the screw.

[0010] As a further improvement to the above technical solution, the adjusting hole passes through the piston rod, and a push rod is slidably disposed in the adjusting hole. The elastic element is connected between the push pin and the push rod. When the push rod moves downward, it provides pressure to drive the elastic element to seal the push pin in the center hole of the screw.

[0011] As a further improvement to the above technical solution, the outer tube is provided with an adjusting knob assembly for adjusting the position of the push rod in the adjusting hole. The adjusting knob assembly provides a force to drive the push rod to move in the direction of the screw.

[0012] As a further improvement to the above technical solution, a spring-loaded valve needle is provided between the push rod and the inner wall of the piston rod in the adjusting hole. The spring-loaded valve needle is used to adjust the oil flow rate of the oil outlet when it moves in the piston rod.

[0013] As a further improvement to the above technical solution, a sealing groove is provided on the outer periphery of the piston block, a guide ring is provided in the sealing groove, and an adjusting ring is provided between the guide ring and the bottom side of the sealing groove. The adjusting ring is elastic and can drive the guide ring to move along the diameter direction of the piston block. The piston block is slidably sealed in the inner tube by the guide ring.

[0014] As a further improvement to the above technical solution, a sealing port is provided at one end of the outer tube. The diameter of the sealing port is smaller than the inner diameter of the outer tube. The inner tube is slidably sealed inside the outer tube through the sealing port, and there is a gap between the outer wall of the inner tube and the inner wall of the outer tube.

[0015] As a further improvement to the above technical solution, a pneumatic piston is provided at one end of the inner tube located inside the outer tube. The pneumatic piston divides the space inside the outer tube into an elastic air chamber and a movable air chamber. The gap between the inner tube and the outer tube forms the elastic air chamber. An air nozzle communicating with the movable air chamber is provided at one end of the outer tube away from the inner tube.

[0016] The beneficial effects of this invention are: when the shock absorber is working, the oil outlet channel and the oil inlet channel are basically independent channels, and the shock absorber oil in the oil groove will not be affected. When the shock absorber expands and contracts rapidly, the shock absorber oil can flow quickly without interference, which improves the shock absorber's damping response effect. This can also prevent blockage and improve the stability of the shock absorber. In addition, the shock absorber of this invention has a reasonable structure and high reliability. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a front view of the bicycle shock absorber of the present invention;

[0019] Figure 2 yes Figure 1 Sectional view of AA;

[0020] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0022] Figure 5 This is a schematic diagram illustrating the compression state changes of the bicycle shock absorber of the present invention;

[0023] Figure 6 This is an exploded view of the bicycle shock absorber of the present invention;

[0024] Figure 7 In the figures, a, b, and c are the top view, side view, and bottom view of the piston block in this invention, respectively.

[0025] Figure 8 This is a schematic diagram of the screw structure in this invention.

[0026] Reference numerals: 1. Inner tube; 2. Outer tube; 3. Sealing cap; 4. First pivot point; 5. First support arm; 6. Locking knob; 7. First air nozzle; 8. Second support arm; 9. Second pivot point; 10. Second air nozzle; 11. Air chamber piston; 12. Piston rod; 121. Oil outlet; 122. Narrowing section; 13. Rebound valve needle; 14. Push rod; 15. Blind hole; 16. Push pin; 161. Spring; 17. Sealing port; 18. First sealing ring; 19. Fixed retaining ring; 20. Buffer pad; 21. Air pressure piston; 22. Second sealing ring; 23. Piston block; 231. Seal 232. Groove; 233. Through hole; 234. Guide groove; 235. First center hole; 24. Screw; 246. Connecting section; 247. Transition section; 248. Fixing section; 249. Second center hole; 240. Oil flow groove; 241. Retracting groove; 242. Nut; 243. First valve plate; 244. Second valve plate; 25. Pressure ring; 26. Screw; 27. Cam; 28. Locking lever; 39. Spring-loaded knob; 30. Steel ball; 31. Rear shock absorber dust seal; 32. Sealing ring; 33. Bushing; 34. Limiting screw; 35. Sealing ring retainer; 36. Adjusting ring; 47. Guide ring. Detailed Implementation

[0027] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0028] Reference Figure 1-6 As shown, a bicycle shock absorber includes an open outer tube 2, a closed inner tube 1, and a rebound piston. The inner tube 1 is slidably sealed within the outer tube 2. A sealing cap 3 is provided at the end of the outer tube 2 away from the inner tube 1. A piston rod 12 is provided on the side wall of the sealing cap 3 inside the outer tube 2. The bottom end of the piston rod 12 extends into the inner tube 1 and is fixedly connected to the rebound piston. The rebound piston is slidably sealed within the inner tube 1 and divides the space inside the inner tube 1 into a rebound chamber and an oil storage chamber. The oil storage chamber is filled with shock-absorbing oil.

[0029] Reference Figure 3 , Figure 6 , Figure 7 a, Figure 7 b、 Figure 7 c and Figure 8 As shown, the rebound piston includes a piston block 23 and a screw 24. The piston block 23 has a first central hole 234. The end of the piston rod 12 is fixed in the first central hole 234 by means of threaded connection, transition fit, or other connection methods, thereby realizing the fixed installation of the piston rod 12 and the rebound piston. The piston rod 12 has an adjustment hole along its axis, and the screw 24 is fixed in the adjustment hole by means of threaded connection. The screw 24 has a second central hole 244 along its axis. The screw 24 is provided with a plurality of oil grooves 245. In this embodiment, four oil grooves 245 are preferably evenly distributed on the peripheral wall of the screw 24. In other embodiments, the number of oil grooves 245 is preferably six, and the oil grooves 245 can be provided in other places of the screw 24 except for the peripheral wall. The piston block 23 is provided with a plurality of through holes 232 and connecting holes. A guide groove 233 is connected between the through hole 232 and the oil flow groove 245. In this embodiment, there are eight through holes 232 and eight guide grooves 233. The eight through holes 232 are arranged in a circular array. Each pair of adjacent through holes 232 and guide grooves 233 are connected to one of the oil flow grooves 245. The piston block 23 is fixedly connected to the two ends of a first valve plate 26 and a second valve plate 27 respectively. When the first valve plate 26 and the second valve plate 27 are in their natural state, they respectively seal the upper and lower ends of the through hole 232. When the valve plate is in its elastic state, it opens the through hole 232. An oil outlet hole 121 is provided on the piston rod 12. The oil outlet hole 121 is connected to the oil flow groove 245. A push pin 16 that can move along its axis is provided in the adjustment hole. When the push pin 16 moves, it blocks or opens the second center hole 244 of the screw 24.

[0030] In this embodiment, refer to Figure 5As shown, when the shock absorber is compressed, the piston rod 12 pushes the rebound piston towards the inner tube 1, and the second valve plate 27 closes the through hole 232. The damping oil in the oil storage chamber can only enter the second central hole 244. Under the action of the damping oil, the ejector pin 16 is pushed upward to move away from the screw 24. Then the damping oil passes through the oil flow groove 245, the guide groove 233 and the through hole 232 in sequence and pushes open the first valve plate 26 to enter the rebound chamber. When the shock absorber is extended, the first valve plate 26 blocks the through hole 232. The damping oil can only enter from the oil outlet 121 and push the ejector pin 16 downward to block the second central hole 244. Then the damping oil passes through the oil flow groove 245, the guide groove 233 and the through hole 232 in sequence and pushes open the second valve plate 27 to enter the oil storage chamber. With the above settings, when the shock absorber is working, the oil outlet channel and the oil inlet channel are basically independent channels. The damping oil in the oil groove 245 will not be affected. When the shock absorber extends and retracts rapidly, the damping oil can flow quickly without interference, which improves the damping response of the shock absorber. In addition, this can also prevent blockage and improve the stability of the shock absorber.

[0031] Preferred, refer to Figure 3 , Figure 6 As shown, the bottom end of the piston rod 12 is provided with a constricted section 122, which is fixedly connected to the first central hole 234 of the piston block 23. The top of the constricted section 122 has a stepped portion, and a clamping ring 28 is provided on the outer wall of the constricted section 122 at the stepped portion. The clamping ring 28 presses the first valve plate 26 against the top of the piston block 23, thereby blocking the top end of the through hole 232.

[0032] Additionally, the screw 24 includes a connecting section 241, a transition section 242, and a fixing section 243. The connecting section 241 is threaded into the adjusting hole at the constricted section 122, and the connecting section 241 is provided with the oil flow groove 245. The diameter of the connecting section 241 is smaller than the diameter of the transition section 242. A relief groove is provided between the connecting section 241 and the transition section 242. The relief groove can connect multiple oil flow grooves 245, thereby improving the flow effect of the damping oil. A nut 25 is connected to the fixing section 243. The nut 25 presses the second valve plate 27 against the bottom of the piston block 23, thereby blocking the bottom end of the through hole 232 and the guide groove 233, so that the oil flow groove 245, the guide groove 233, and the through hole 232 form an oil passage.

[0033] In this embodiment, refer to Figure 3 , Figure 6As shown, both the first valve plate 26 and the second valve plate 27 are stacked valve plates, which facilitates the fixed installation of the first valve plate 26 and the second valve plate 27, and also allows the first valve plate 26 and the second valve plate 27 to have a suitable elastic deformation space, thereby improving the reliability of the structure.

[0034] In a preferred embodiment, refer to Figure 3 , Figure 6 As shown, an elastic element is provided between the ejector pin 16 and the adjustment hole. The elastic element provides a preload to cause the ejector pin 16 to abut against the center hole of the screw. In this embodiment, the elastic element is a spring 161. When the shock absorber is compressed, damping oil enters the second center hole 244, pushing the ejector pin 16 upward to open the second center hole 244 and compressing the spring 161. When the shock absorber extends, the spring 161 returns to its elastic force, causing the ejector pin 16 to move back and block the second center hole 244. Alternatively, in other embodiments, when the shock absorber extends, damping oil enters the adjustment hole from the oil outlet 121 and pushes the ejector pin 16 downward to block the second center hole 244 and compress the spring 161. When the shock absorber is compressed, the spring 161 returns to its elastic force, causing the ejector pin 16 to move back and open the second center hole 244. This arrangement improves the stability of the ejector pin 16's movement.

[0035] In this embodiment, refer to Figure 4 , Figure 6As shown, a push rod 14 is slidably disposed within the adjustment hole. A blind hole 15 is provided at the bottom of the push rod 14. A slide rod on the push pin 16 is slidably connected to the blind hole 15. A spring 161 is sleeved on the slide rod and connected between the push pin 16 and the push rod 14 to facilitate the movement of the push pin 16. An adjustment knob assembly is provided on the sealing cover 3 to adjust the position of the push rod 14 in the adjustment hole. The adjustment knob assembly provides a force to drive the push rod 14 to move toward the screw 24. Specifically, the adjustment knob assembly includes a locking knob 6, a locking lever 31, and a cam 30. The sealing cover 3 is provided with an installation space for the locking lever 31 and the cam 30 to rotate. The locking lever 31 is rotatably connected to the sealing cover 3. One end of the locking lever 31 extends out of the sealing cover 3 and is fixedly connected to the locking knob 6. The cam 30 is integrally formed with the locking lever 31. The cam 30 slides in contact with the top of the push rod 14. Operating the locking knob 6 drives the locking lever 31 to rotate. The cam 30 can push the push rod 14 downward. When the push rod 14 moves downward, it provides pressure to the spring 161, which is compressed. This allows adjustment of the upward movement distance of the pin 16, and thus adjusts the flow of damping oil between the second central hole 244 and the pin 16 when the shock absorber is compressed, thereby adjusting the damping effect. In addition, when the cam 30 pushes the push rod 14 to the lowest position, the elastic force of the compressed spring 161 tightly holds the pin 16 against the second central hole 244. The upward impact force of the damping oil is insufficient to push the pin 16 upward. Therefore, the pin 16 blocks the second central hole 244 and locks it. In the locked state, the shock absorber cannot be compressed. Since bicycles need to stand up and pedal when climbing hills, locking it saves energy.

[0036] In this embodiment, a spring valve needle 13 is provided between the top rod 14 and the inner wall of the piston rod 12 in the adjustment hole. A spring knob 32 is provided in the installation space of the sealing cover 3. The spring knob 32 includes a driving part that contacts the top of the spring valve needle 13 and an operating part located outside the sealing cover 3. A steel ball 33 assembly is provided on the sealing cover 3. The steel ball 33 assembly contacts the spring knob 32. In this way, the spring knob 32 has a tactile feedback when turned, which improves the operability of the structure. Operating the spring knob 32 can drive the spring valve needle 13 to slide in the piston rod 12, thereby adjusting the overlap range between it and the oil outlet 121 to adjust the flow rate of the oil outlet 121, and thus adjust the stiffness of the shock absorber. A limit screw 37 is provided on the sealing cover 3. Multiple limit holes are provided on the upper ring of the driving part. The fixing of the shock absorber after the stiffness adjustment is achieved by the cooperation of the limit screw 37 and the limit holes.

[0037] In a preferred embodiment, refer to Figure 3 , Figure 7 As shown in Figure b, a sealing groove 231 is provided on the outer periphery of the piston block 23. A guide ring 40 is provided in the sealing groove 231. An adjusting ring 39 is provided between the guide ring 40 and the bottom side of the sealing groove 231. The adjusting ring 39 is elastic and can drive the guide ring 40 to move along the diameter direction of the piston block 23. The piston block 23 is slidably sealed in the inner tube 1 by the guide ring 40. In the prior art, in order to improve the reliability of the sliding seal between the rebound piston and the inner tube 1, the outer peripheral wall of the piston block 23 needs to have high precision, which results in high processing costs. In this invention, by setting the guide ring 40 and the adjusting ring 39, the guide ring 40 does not need to have high precision to achieve the sliding seal between the rebound piston and the inner tube 1, which is reliable and can reduce processing costs.

[0038] In this embodiment, refer to Figure 3 As shown, one end of the outer tube 2 is provided with a sealing port 17. The sealing port 17 is a concave opening of the outer tube 2, so the diameter of the sealing port 17 is smaller than the inner diameter of the outer tube 2. Therefore, there is a gap between the outer wall of the inner tube 1 and the inner wall of the outer tube 2. A first sealing ring 18 is provided on the inner wall of the sealing port 17. Sealing ring retainers 38 are provided on both sides of the first sealing ring 18. A fixing retainer 19 is also provided on the inner wall of the sealing port 17 to fix the first sealing ring 18 and the sealing ring retainers 38 to the inner wall of the sealing port 17. The outer tube 2 and the inner tube 1 are slidably sealed within the outer tube 2 through the sealing port 17. The end of the sealing port 17 is also provided with a rear shock-absorbing dust seal 34 to prevent dust from entering.

[0039] Reference Figure 3As shown, a pneumatic piston 21 is provided at one end of the inner tube 1 inside the outer tube 2. Specifically, the pneumatic piston 21 can be fixed to the end of the inner tube 1 by screws 29. The outer wall of the pneumatic piston 21 is slidably sealed to the inner wall of the outer tube 2. Specifically, the outer wall of the pneumatic piston 21 is provided with a groove, in which a second sealing ring 22 is provided. A sealing ring retainer 38 is also provided on both sides of the second sealing ring 22, thereby fixing the second sealing ring 22 to the pneumatic piston 21. A buffer pad 20 is provided above the retainer 38 to buffer the pressure of the pneumatic piston 21. The pressure piston 21 is slidably sealed to the piston rod 12 through a third central hole provided along its axis. A bushing 36 is provided in the third central hole, and the pressure piston 21 is slidably connected to the piston rod 12 through the bushing 36. The pressure piston 21 divides the inner space of the outer tube 2 into an elastic air chamber and a movable air chamber. The gap between the inner tube 1 and the outer tube 2 forms the elastic air chamber. In order to increase the volume of the elastic air chamber, in this embodiment, an outwardly protruding expansion part is provided at the connection between the outer tube 2 and the sealing port 17. A first air nozzle 7 communicating with the movable air chamber is provided at the end of the outer tube 2 away from the inner tube 1.

[0040] When the shock absorber compresses, the pneumatic piston 21 moves with the inner tube 1 towards the sealing cover 3 within the outer tube 2. The volume of the movable air chamber decreases, and gas is discharged from the outer tube 2 through the first air nozzle 7. The volume of the elastic air chamber increases, and the air pressure within the elastic air chamber decreases, generating potential energy to drive the pneumatic piston 21 towards the sealing port 17. When the shock absorber extends, the pneumatic piston 21 moves towards the sealing port 17 of the outer tube 2. The volume of the movable air chamber increases, and the air pressure decreases. Gas enters the movable air chamber from the first air nozzle 7, while the volume of the elastic air chamber decreases, the gas is compressed, and the air pressure increases, generating potential energy to drive the pneumatic piston 21 towards the sealing cover 3. Therefore, in this embodiment, the movement of the pneumatic piston 21 provides power to the elastic air chamber, further improving the shock absorption effect of the shock absorber.

[0041] In a preferred embodiment, refer to Figure 2 As shown, an air chamber piston 11 is provided in the inner tube 1. The oil storage chamber is located between the air chamber piston 11 and the rebound piston. A high-pressure air chamber with high-pressure gas is formed between the air chamber piston 11 and the end of the inner tube 1. A second air nozzle 10 is provided on the end of the inner tube 1 to facilitate the filling and releasing of the high-pressure air chamber. This arrangement allows the damping oil and high-pressure gas to be separated, preventing the damping oil from emulsifying and making it more stable. As a result, the air dissolved in the damping oil is less likely to precipitate and form cavitation bubbles. Cavitation bubbles affect the density and viscosity of the oil, thus affecting the damping effect. Furthermore, when cavitation bubbles explode, they can damage the valve plate and the surface of the flow channel. Therefore, this arrangement can improve the reliability of the shock absorber.

[0042] In this embodiment, refer to Figure 2 , Figure 6 As shown, O-rings 35 are provided between the sealing cap 3 and the outer tube 2, between the pneumatic piston 21 and the piston rod 12, between the piston rod 12 and the sealing cap 3, between the piston rod 12 and the rebound valve needle 13, between the rebound valve needle 13 and the top rod 14, and between the pneumatic piston 21 and the inner tube 1. The size and specifications of the O-rings 35 at each position are selected according to the actual situation to improve the sealing effect of the shock absorber.

[0043] In this embodiment, refer to Figure 1 , Figure 2 class Figure 6 As shown, the sealing cover 3 is integrally formed with a first support arm 5, and a first pivot point 4 is provided on the first support arm 5. The end of the inner tube 1 is integrally formed with a second support arm 8, and the second support arm 8 is provided with a second pivot point 9. The setting of the first pivot point 4 and the second pivot point 9 facilitates the installation of the shock absorber on the bicycle.

[0044] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A bicycle shock absorber, comprising an outer tube, an inner tube, and a rebound piston, wherein the inner tube is slidably sealed within the outer tube, a piston rod is disposed within the outer tube and the end of the piston rod is fixed to the rebound piston, and the rebound piston is slidably sealed within the inner tube, characterized in that: The rebound piston includes a piston block and a screw. Both the piston block and the screw have a central hole. The screw is connected to the central hole of the piston block. The screw is provided with multiple oil grooves. The piston block is provided with multiple through holes and a guide groove connecting the through holes and the oil grooves. The piston rod is provided with an oil outlet hole, which communicates with the oil grooves. Both ends of the piston block are fixedly connected to valve plates. When the valve plates are in a natural state, they seal the through hole. When the valve plates are in an elastic state, they open the through hole. The piston rod is provided with an adjustment hole along its central axis. A pin that can move along its axis is provided in the adjustment hole. When the pin moves, it blocks or opens the central hole of the screw. The screw includes a connecting section and a fixing section. The diameter of the connecting section is smaller than the diameter of the fixing section. The connecting section is connected to the central hole of the piston block and the oil groove is provided on the connecting section. A nut is connected to the fixing section, and the nut presses a valve plate against the bottom of the piston block.

2. A bicycle shock absorber according to claim 1, characterized in that: The piston rod has a constricted section at its bottom end, which is fixedly connected to the center hole of the piston block. The connecting section is connected to the inside of the constricted section. The top of the constricted section has a stepped portion, which presses another valve plate against the top of the piston block.

3. A bicycle shock absorber according to claim 2, characterized in that: An elastic element is provided between the ejector pin and the adjustment hole, and the elastic element provides a pre-pressure to make the ejector pin abut against the center hole of the screw.

4. A bicycle shock absorber according to claim 3, characterized in that: The adjusting hole passes through the piston rod, and a push rod is slidably disposed in the adjusting hole. The elastic element is connected between the push pin and the push rod. When the push rod moves downward, it provides pressure to drive the elastic element to seal the push pin in the center hole of the screw.

5. A bicycle shock absorber according to claim 4, characterized in that: The outer tube is provided with an adjustment knob assembly for adjusting the position of the push rod in the adjustment hole. The adjustment knob assembly provides a force to drive the push rod to move in the direction of the screw.

6. A bicycle shock absorber according to claim 5, characterized in that: A spring-loaded valve needle is provided between the push rod and the inner wall of the piston rod in the adjusting hole. The spring-loaded valve needle is used to adjust the oil flow rate of the oil outlet when it moves in the piston rod.

7. A bicycle shock absorber according to claim 1, characterized in that: A sealing groove is provided on the outer periphery of the piston block, and a guide ring is provided in the sealing groove. An adjusting ring is provided between the guide ring and the bottom side of the sealing groove. The adjusting ring is elastic and can drive the guide ring to move along the diameter direction of the piston block. The piston block is slidably sealed in the inner tube by the guide ring.

8. A bicycle shock absorber according to claim 7, characterized in that: One end of the outer tube is provided with a sealing port, the diameter of which is smaller than the inner diameter of the outer tube. The inner tube is slidably sealed inside the outer tube through the sealing port, and there is a gap between the outer wall of the inner tube and the inner wall of the outer tube.

9. A bicycle shock absorber according to claim 8, characterized in that: A pneumatic piston is provided at one end of the inner tube inside the outer tube. The pneumatic piston divides the space inside the outer tube into an elastic air chamber and a movable air chamber. The gap between the inner tube and the outer tube forms the elastic air chamber. An air nozzle communicating with the movable air chamber is provided at one end of the outer tube away from the inner tube.

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