Damping-adjustable single-cylinder shock absorber with nitrogen tank and adjusting method of damping-adjustable single-cylinder shock absorber

Abstract

The damping-adjustable single-barrel shock absorber with the nitrogen tank comprises an aluminum oil storage cylinder, a dust cover assembly and a cylinder base are arranged at the front end and the rear end of the aluminum oil storage cylinder respectively, a piston valve assembly and a piston rod are arranged in the aluminum oil storage cylinder, one end of the piston rod penetrates into the piston valve assembly, and the other end of the piston rod penetrates into the cylinder base. The aluminum oil storage cylinder is characterized in that an O-shaped ring is arranged on the outer side of the cylinder base in a sleeved mode, a high-pressure oil pipe is arranged on the side wall of the cylinder base, one end of the high-pressure oil pipe is connected with the cylinder base, and the other end of the high-pressure oil pipe is provided with a nitrogen bag assembly. The nitrogen bag assembly is communicated with the aluminum oil storage cylinder through the high-pressure oil pipe; the adjustable assembly is used for adjusting the damping value of shock absorber oil flowing into the nitrogen bag assembly, flexible adjustment of the damping value of the shock absorber is achieved by arranging the adjustable assembly, and the driving stability and riding comfort of a vehicle under different road conditions are improved.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorbers, and in particular to a single-tube shock absorber with adjustable damping and a nitrogen tank and an adjustment method thereof. Background Art

[0002] During the driving process of the car, in order to quickly attenuate the vibration of the frame and the body, so as to improve the smoothness and comfort of the car's driving, shock absorbers are generally installed on the car suspension system. During daily driving, the car should be equipped with appropriate shock absorbers according to different road conditions, which can not only greatly improve the driving comfort, but also effectively increase the service life of the shock absorber. In the scene where the car is in poor condition or the shock absorber is required to be high, an aluminum single-tube shock absorber is generally used, and a nitrogen tank is added. High-pressure nitrogen is filled inside and stored in the air chamber of the nitrogen tank. The oil and gas are separated by a free piston. It has the advantages of fast response, simple structure, easy heat dissipation and convenient maintenance. However, this structure also has certain limitations. The damping force value of the valve system is single, and it is difficult to adapt to different road conditions, which greatly affects the riding comfort. In order to solve the technical problem of single damping value of valve system in the prior art, a single-tube shock absorber with adjustable damping and nitrogen tank capable of adjusting the damping value is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a monotube shock absorber with adjustable damping and a nitrogen tank, aiming to solve the problem that the damping of the existing shock absorber is fixed and cannot be adjusted, while improving the comfort and stability of the shock absorber. In order to overcome the shortcomings of the prior art, the present invention provides a monotube shock absorber with adjustable damping and a nitrogen tank and an adjustment method thereof.

[0004] The present invention is implemented by the following technical solutions: A single-tube shock absorber with adjustable damping of a nitrogen tank, comprising an aluminum oil storage cylinder, wherein a dust cover assembly and a cylinder base are respectively provided at the front and rear ends of the aluminum oil storage cylinder, wherein the dust cover assembly and the cylinder base are snapped into the inner wall of the aluminum oil storage cylinder and are fixedly connected thereto by welding, wherein a piston valve assembly and a piston rod are provided inside the aluminum oil storage cylinder, wherein one end of the piston rod is inserted into the piston valve assembly and is fixedly connected thereto by a nut, and the other end of the piston rod penetrates the dust cover assembly and extends out of the aluminum oil storage cylinder, wherein an O-ring is sleeved on the outer side of the cylinder base, wherein a high-pressure oil pipe is provided on the side wall of the cylinder base, wherein one end of the high-pressure oil pipe is connected to the cylinder base, and the other end is provided with a nitrogen bag assembly, wherein the high-pressure oil pipe connects the nitrogen bag assembly and the aluminum oil storage cylinder; The nitrogen bag assembly comprises a nitrogen bag outer cylinder, one end of the nitrogen bag outer cylinder is provided with a nitrogen bag end cap, and the other end is provided with an adjustable assembly, the nitrogen bag end cap and the adjustable assembly are fixedly connected to the nitrogen bag outer cylinder, a floating piston assembly is provided in the nitrogen bag outer cylinder, the space between the floating piston assembly and the nitrogen bag end cap is filled with high-pressure nitrogen, and a one-way valve is provided on the side wall of the nitrogen bag end cap; The adjustable assembly is used to adjust the damping value of the shock absorber oil flowing into the nitrogen bag assembly.

[0005] The adjustable assembly includes a regulating valve base, a compression valve assembly and a regulating valve core. The regulating valve base is clamped on the inner wall of the nitrogen bag outer cylinder and fixedly connected thereto. The compression valve assembly is fixed on the inner wall of the regulating valve base. The regulating valve core is arranged in the regulating valve base and is connected to the compression valve assembly.

[0006] The regulating valve core comprises a valve core body, and the valve core body is provided with a plurality of oil drain grooves of different specifications, and the oil drain grooves are arranged along the center circumference of the valve core body in a range from the smallest oil drain groove to the largest oil drain groove, from small to large specifications; A limiting protrusion is provided at the upper end of the valve core body, a connecting column is provided at the upper end of the limiting protrusion, a threaded hole is provided at the top end of the connecting column, and notches are symmetrically provided on both sides of the upper end of the connecting column.

[0007] The top of the regulating valve core is provided with an adjusting knob, the center of the inside of the regulating knob is provided with a guide channel, the adjusting knob is engaged with a connecting column on the regulating valve core, and the adjusting knob is fixedly connected to the connecting column by bolts.

[0008] The regulating valve base is provided with a receiving cavity, the receiving cavity is located at the connection between the regulating knob and the regulating valve core, a steel ball is provided in the receiving cavity, and a cylindrical helical compression spring is provided between the steel ball and the receiving cavity.

[0009] A positioning pin is arranged in the regulating valve base, and the positioning pin is located at the edge of the limiting protrusion.

[0010] The piston rod is sleeved with a guide assembly, the guide assembly is located in the aluminum oil storage cylinder near the dust cover assembly, and the outer peripheral wall of the guide assembly is sleeved with a retaining spring; An upper lifting ring is provided at the end of the piston rod away from the piston valve assembly. The upper lifting ring is threadedly connected to the piston rod. A shock-absorbing sleeve is provided in the upper lifting ring. A shock-absorbing pad is provided between the upper lifting ring and the dust cover assembly. The shock-absorbing pad is sleeved on the piston rod.

[0011] A connecting bolt is provided on the right side of the cylinder base, and the connecting bolt is fixed to the cylinder base through a screw fastener. A washer is sleeved on the connecting bolt, and two washers are provided and symmetrically arranged, and a shock-absorbing block is provided between the washers.

[0012] The piston valve assembly adopts a split structure, including an upper piston and a lower piston, wherein the axial centers of the upper piston and the lower piston are provided with a central hole, and the upper piston and the lower piston are provided with a same number of flow holes, and the flow holes are all fan-shaped holes; A rubber-coated groove is provided on the outer wall of the piston valve assembly.

[0013] A method for adjusting a mono-tube shock absorber with adjustable damping and a nitrogen tank is applied to a mono-tube shock absorber with adjustable damping and a nitrogen tank, and comprises the following steps: S1. By rotating the adjusting knob, the adjusting knob drives the adjusting valve core to rotate, and the adjusting valve core is provided with oil drain grooves of multiple specifications. By rotating the adjusting valve core, shock absorber oil of different flow rates is released from the oil drain grooves.

[0014] Compared with the prior art, the present invention has the following beneficial effects during operation: 1. Ability to adjust the damping value: By setting an adjustable assembly, the adjustable assembly is provided with an adjusting valve core and an adjusting knob. When the adjusting knob is turned, each gear position corresponds to a different oil drain groove position on the adjusting valve core. By controlling the position of the oil drain groove to control the oil flow, the damping force value of the shock absorber can be more controllable, meeting more usage scenarios, realizing flexible adjustment of the shock absorber damping value, and improving the driving stability and riding comfort of the vehicle under different road conditions; 2. By designing the piston valve assembly into a split structure, the piston valve assembly includes an upper piston and a lower piston, and the upper and lower pistons are assembled by using a male and female head. This product has a simple structure. By adopting a split combination structure, the difficulty of the processing technology of the shock absorber piston is improved, the production cost is reduced, the risk caused by burrs during use is reduced, and the safety performance of the shock absorber is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a common monotube shock absorber in the prior art; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 yes Figure 2 A schematic diagram of the structure enlargement in the middle; Figure 4 It is a schematic diagram of the flow path of the shock absorber oil in the adjustable assembly; Figure 5 It is a schematic diagram of the three-dimensional structure of the regulating valve core of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the upper piston of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the lower piston of the present invention; Figure 8 It is a schematic diagram of the shock absorber of the present invention in a stretched state; Fig. 9 It is a schematic diagram of the shock absorber of the present invention in a contracted state; In the figure: 1. Aluminum oil storage cylinder; 2. Piston rod; 3. Guide assembly; 4. Circlip; 5. Dust cover assembly; 6. Upper lifting ring; 7. Shock-absorbing sleeve; 8. Shock-absorbing pad; 9. Check valve; 10. Nitrogen bag end cover; 11. Nitrogen bag outer cylinder; 12. Floating piston assembly; 13. Adjustable assembly; 14. High-pressure oil pipe; 15. Washer; 16. Shock-absorbing block; 17. Connecting bolt; 18. Cylinder base; 19. O-ring; 20. Piston valve assembly; 201. Upper piston; 202. Lower piston; 21. Adjusting valve base; 22. Compression valve assembly; 23. Adjusting valve core; 231. Connecting column; 232. Limiting bump; 233. Minimum oil drain groove; 234. Valve core body; 235. Maximum oil drain groove; 24. Positioning pin; 25. Cylindrical helical compression spring; 26. Steel ball; 27. Adjusting knob. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0017] like Figure 1 As shown, this type of shock absorber is a conventional aluminum monotube shock absorber, with a nitrogen tank added. High-pressure nitrogen is poured into the nitrogen tank, and the oil and gas are separated by a free piston. It has the advantages of fast response, simple structure, easy heat dissipation and convenient maintenance. However, this structure also has certain limitations. The valve system damping force value is single, and it is difficult to adapt to different road conditions. Therefore, it is particularly important to develop a shock absorber that can effectively absorb road impact and adjust the damping value according to actual needs. To solve the above problems, the present invention provides a single-tube shock absorber with adjustable damping with a nitrogen tank, which has excellent shock absorption performance, a wide damping adjustment range and stable structural characteristics; like Figures 2 to 7 As shown, a single-tube shock absorber with adjustable damping with a nitrogen tank includes an aluminum oil storage cylinder 1 as the main structure of the shock absorber, which is used to contain shock absorber oil and withstand the impact force from the road surface. The aluminum material has good strength and corrosion resistance, and is light in weight, which is conducive to reducing the overall weight of the vehicle. The front and rear ends of the aluminum oil storage cylinder 1 are respectively provided with a dust cover assembly 5 and a cylinder base 18. The dust cover assembly 5 and the cylinder base 18 are snapped into the inner wall of the aluminum oil storage cylinder 1 and are welded and fixedly connected thereto to ensure sealing and stability. The dust cover assembly is used to prevent dust and impurities from entering the shock absorber and protect the shock absorber from damage.

[0018] The aluminum oil storage cylinder 1 is provided with a piston valve assembly 20 and a piston rod 2. One end of the piston rod 2 is inserted into the piston valve assembly 20 and fixedly connected thereto by a nut, and the other end passes through the dust cover assembly 5 and extends out of the aluminum oil storage cylinder 1 for connecting to the vehicle suspension system. An O-ring 19 is sleeved on the outer side of the cylinder base 18. The O-ring 19 is provided to enhance the sealing effect and prevent the shock absorber oil from leaking. A high-pressure oil pipe 14 is provided on the side wall of the cylinder base 18. One end of the high-pressure oil pipe 14 is connected to the cylinder base 18, and the other end is provided with a nitrogen bag assembly. The high-pressure oil pipe 14 connects the nitrogen bag assembly and the aluminum oil storage cylinder 1, so that the high-pressure nitrogen in the nitrogen bag assembly can provide additional damping force for the shock absorber; The nitrogen bag assembly includes a nitrogen bag outer cylinder 11, one end of the nitrogen bag outer cylinder 11 is provided with a nitrogen bag end cap 10, and the other end is provided with an adjustable assembly 13, the nitrogen bag end cap 10 and the adjustable assembly 13 are fixedly connected to the nitrogen bag outer cylinder 11, a floating piston assembly 12 is provided in the nitrogen bag outer cylinder 11, and the space between the floating piston assembly 12 and the nitrogen bag end cap 10 is filled with high-pressure nitrogen, and the high-pressure nitrogen is used to provide a stable damping force during the shock absorption process, and a one-way valve 9 is provided on the side wall of the nitrogen bag end cap 10 for filling the nitrogen bag with high-pressure nitrogen; The adjustable assembly 13 is used to adjust the damping value of the shock absorber oil flowing into the nitrogen bag assembly.

[0019] The adjustable assembly 13 includes a regulating valve base 21, a compression valve assembly 22 and a regulating valve core 23. The regulating valve base 21 is engaged with the inner wall of the nitrogen bag outer tube 11 and fixedly connected thereto. The compression valve assembly 22 is fixed on the inner wall of the regulating valve base 21. The compression valve assembly 22 is used to control the flow of shock absorber oil. The regulating valve core 23 is arranged in the regulating valve base 21 and is connected to the compression valve assembly 22. The flow resistance of the shock absorber oil is changed by adjusting the size of the oil drain groove on the valve core 23, thereby realizing the adjustment of the damping value.

[0020] The regulating valve core 23 includes a valve core body 234, and a plurality of oil drain grooves of different specifications are provided on the valve core body 234. The oil drain grooves are arranged along the center circumference of the valve core body 234 from the smallest oil drain groove 233 to the largest oil drain groove 235, in increasing sizes. This design facilitates the selection of a suitable damping value according to actual needs.

[0021] A limiting protrusion 232 is provided at the upper end of the valve core body 234 for limiting the rotational movement range of the regulating valve core 23. A connecting column 231 is provided at the upper end of the limiting protrusion 232. A threaded hole is provided at the top of the connecting column 231. The connecting column 231 and the threaded hole above are used to be connected to an external regulating knob 27. Notches are symmetrically provided on both sides of the upper end of the connecting column 231 to facilitate tool operation to limit it.

[0022] The top of the regulating valve core 23 is provided with a regulating knob 27 , the center of the regulating knob 27 is provided with a guide channel, the regulating knob 27 is engaged with a connecting column 231 on the regulating valve core 23 , and the regulating knob 27 is fixedly connected to the connecting column 231 by bolts.

[0023] A accommodating chamber is provided on the regulating valve base 21, and the accommodating chamber is located at the connection between the regulating knob 27 and the regulating valve core 23. A steel ball 26 is provided in the accommodating chamber, and a cylindrical helical compression spring 25 is provided between the steel ball 26 and the accommodating chamber. The steel ball 26 and the cylindrical helical compression spring 25 are arranged to provide a damping feeling when the regulating knob 27 is rotated, and to prevent the regulating knob 27 from accidentally loosening.

[0024] A positioning pin 24 is provided in the regulating valve base 21, and the positioning pin 24 is located at the edge of the limiting protrusion 232. The positioning pin 24 cooperates with the limiting protrusion 232 to limit the rotation angle of the regulating valve core 23 to ensure the accuracy of the regulation.

[0025] The piston rod 2 is sleeved with a guide assembly 3, which is located in the aluminum oil storage cylinder 1 near the dust cover assembly 5 and is used to guide and support the piston rod 2. The outer peripheral wall of the guide assembly 3 is sleeved with a retaining spring 4 for fixing the position of the guide assembly 3. An upper lifting ring 6 is provided at the end of the piston rod 2 away from the piston valve assembly 20. The upper lifting ring 6 is threadedly connected to the piston rod 2 for easy connection with the vehicle suspension system. A shock-absorbing sleeve 7 is provided in the upper lifting ring 6. A shock-absorbing pad 8 is provided between the upper lifting ring 6 and the dust cover assembly 5 for reducing friction and wear between the upper lifting ring 6 and the shock absorber. The shock-absorbing pad 8 is sleeved on the piston rod 2 for further reducing vibration and noise.

[0026] A connecting bolt 17 is provided on the right side of the cylinder base 18. The connecting bolt 17 is fixed to the cylinder base 18 by a screw fastener and is used to fix the shock absorber to the vehicle suspension system. A washer 15 is sleeved on the connecting bolt 17. Two washers 15 are provided and symmetrically arranged. The washers 15 are used to increase the contact area between the connecting bolt 17 and the cylinder base 18 to improve the stability and sealing of the connection. Shock-absorbing blocks 16 are provided between the washers 15 to further reduce vibration and impact.

[0027] The existing automobile shock absorber piston adopts an integral oblique hole structure design. Since the shock absorber piston is formed by powder metallurgy, the integral oblique hole design cannot be formed by powder metallurgy process, so it needs to be outsourced for machining and secondary processing of the piston body, which involves the problem of secondary clamping. In addition, the hole is not a straight hole in the traditional sense, but an oblique hole, which is slightly more difficult, and the drill bit is prone to breakage during drilling, and burrs are easily generated. The burrs attached to the piston hole fall into the shock absorber and easily cause abnormal noise, resulting in unstable shock absorber performance and high production costs. In order to solve the above-mentioned problems, the solution adopted is to cancel the drilling process and directly adopt a split piston. The piston valve assembly 20 adopts a split structure, including an upper piston 201 and a lower piston 202. The axial centers of the upper piston 201 and the lower piston 202 are provided with a center hole, and the center hole is used to accommodate the piston rod 2. The upper piston 201 and the lower piston 202 are provided with a same number of flow holes, and the flow holes are all fan-shaped holes. The fan-shaped flow holes are used to control the flow direction and speed of the shock absorber oil; by adopting a split combined structure, the difficulty of the processing technology of the shock absorber piston is improved, the production cost is reduced, the risk caused by burrs during use is reduced, and the safety performance of the shock absorber is improved.

[0028] The outer wall of the piston valve assembly 20 is provided with a rubber coating groove, which is used to install a rubber seal to enhance the sealing effect.

[0029] A method for adjusting a mono-tube shock absorber with adjustable damping and a nitrogen tank is applied to a mono-tube shock absorber with adjustable damping and a nitrogen tank, and comprises the following steps: S1. By rotating the adjusting knob 27, the adjusting knob 27 drives the adjusting valve core 23 to rotate, and the adjusting valve core 23 is provided with a plurality of oil drain grooves of different specifications. By rotating the adjusting valve core 23, shock absorber oil of different flow rates is released from the oil drain groove.

[0030] The working principle of the present invention is that on the basis of a conventional single-tube shock absorber, when the shock absorber is compressed, a passage is added, and the oil drain holes with different flow areas are provided. By controlling the flow rate of the passage during compression, the damping force value during compression is adjusted. After installation, during the operation of the shock absorber, the process from the longest stretch of the piston rod 2 to the shortest compression of the piston rod 2 is continuously repeated, as shown in the attached manual. Figure 8 and attached Fig. 9 During the downward pressure of the piston rod 2, the oil passes through the hole at the bottom of the cylinder → the high-pressure oil pipe 14 → the oil drain groove → and enters the nitrogen bag. At this time, the adjusting knob 27 is rotated to adjust the size of the oil drain groove on the regulating valve core 23, which also corresponds to the change of the flow area in the oil drain groove, and then the corresponding compression / restoring force value also changes accordingly, thereby realizing the adjustment of the shock absorber damping value.

[0031] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A single-tube shock absorber with adjustable damping and nitrogen tank, comprising an aluminum oil storage cylinder (1), wherein the front and rear ends of the aluminum oil storage cylinder (1) are respectively provided with a dust cover assembly (5) and a cylinder base (18), wherein the dust cover assembly (5) and the cylinder base (18) are snap-fitted into the inner wall of the aluminum oil storage cylinder (1) and are fixedly connected thereto by welding, wherein a piston valve assembly (20) and a piston rod (2) are provided inside the aluminum oil storage cylinder (1), wherein one end of the piston rod (2) is inserted into the piston valve assembly (20) and is fixedly connected thereto by a nut, and the other end of the piston rod (2) passes through the dust cover assembly (5) and extends out of the aluminum oil storage cylinder (1), wherein: An O-ring (19) is sleeved on the outer side of the cylinder base (18), a high-pressure oil pipe (14) is provided on the side wall of the cylinder base (18), one end of the high-pressure oil pipe (14) is connected to the cylinder base (18), and the other end is provided with a nitrogen bag assembly, and the high-pressure oil pipe (14) connects the nitrogen bag assembly and the aluminum oil storage cylinder (1); The nitrogen bag assembly comprises a nitrogen bag outer cylinder (11), one end of the nitrogen bag outer cylinder (11) is provided with a nitrogen bag end cover (10), and the other end is provided with an adjustable assembly (13), the nitrogen bag end cover (10) and the adjustable assembly (13) are fixedly connected to the nitrogen bag outer cylinder (11), a floating piston assembly (12) is provided in the nitrogen bag outer cylinder (11), the space between the floating piston assembly (12) and the nitrogen bag end cover (10) is filled with high-pressure nitrogen, and a one-way valve (9) is provided on the side wall of the nitrogen bag end cover (10); The adjustable assembly (13) is used to adjust the damping value of the shock absorber oil flowing into the nitrogen bag assembly.

2. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 1, characterized in that: The adjustable assembly (13) comprises a regulating valve base (21), a compression valve assembly (22) and a regulating valve core (23); the regulating valve base (21) is engaged with the inner wall of the nitrogen bag outer cylinder (11) and is fixedly connected thereto; the compression valve assembly (22) is fixed on the inner wall of the regulating valve base (21); and the regulating valve core (23) is arranged in the regulating valve base (21) and is in communication with the compression valve assembly (22).

3. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 2, characterized in that: The regulating valve core (23) comprises a valve core body (234), and the valve core body (234) is provided with a plurality of oil drain grooves of different specifications, wherein the oil drain grooves are arranged along the circumference of the center of the valve core body (234) in a range from the smallest oil drain groove (233) to the largest oil drain groove (235), in a range from small to large specifications; A limiting protrusion (232) is provided at the upper end of the valve core body (234), a connecting column (231) is provided at the upper end of the limiting protrusion (232), a threaded hole is provided at the top end of the connecting column (231), and notches are symmetrically provided on both sides of the upper end of the connecting column (231).

4. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 3, characterized in that: An adjusting knob (27) is provided at the top end of the adjusting valve core (23), a guide channel is provided at the center of the adjusting knob (27), the adjusting knob (27) is engaged with a connecting column (231) on the adjusting valve core (23), and the adjusting knob (27) is fixedly connected to the connecting column (231) by means of bolts.

5. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 4, characterized in that: The regulating valve base (21) is provided with a receiving cavity, the receiving cavity is located at the connection between the regulating knob (27) and the regulating valve core (23), a steel ball (26) is provided in the receiving cavity, and a cylindrical helical compression spring (25) is provided between the steel ball (26) and the receiving cavity.

6. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 5, characterized in that: A positioning pin (24) is provided in the regulating valve base (21), and the positioning pin (24) is located at the edge of the limiting protrusion (232).

7. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 1, characterized in that: The piston rod (2) is sleeved with a guide assembly (3), the guide assembly (3) is located in the aluminum oil storage cylinder (1) near the dust cover assembly (5), and a retaining spring (4) is sleeved on the outer peripheral wall of the guide assembly (3); An upper lifting ring (6) is provided at the end of the piston rod (2) away from the piston valve assembly (20), the upper lifting ring (6) and the piston rod (2) are threadedly connected, a shock-absorbing sleeve (7) is provided inside the upper lifting ring (6), a shock-absorbing pad (8) is provided between the upper lifting ring (6) and the dust cover assembly (5), and the shock-absorbing pad (8) is sleeved on the piston rod (2).

8. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 1, characterized in that: A connecting bolt (17) is provided on the right side of the cylinder base (18), and the connecting bolt (17) is fixed to the cylinder base (18) by means of a screw fastener. A washer (15) is sleeved on the connecting bolt (17), and two washers (15) are provided and symmetrically arranged. A shock absorbing block (16) is provided between the washers (15).

9. The monotube shock absorber with adjustable damping and nitrogen tank according to claim 1, characterized in that: The piston valve assembly (20) adopts a split structure, comprising an upper piston (201) and a lower piston (202), wherein the axial centers of the upper piston (201) and the lower piston (202) are provided with a central hole, and the upper piston (201) and the lower piston (202) are provided with a same number of flow holes, and the flow holes are all fan-shaped holes; A rubber coating groove is provided on the outer wall of the piston valve assembly (20).

10. A method for adjusting a mono-tube shock absorber with adjustable damping and a nitrogen tank, applied to a mono-tube shock absorber with adjustable damping and a nitrogen tank as claimed in any one of claims 1 to 7, characterized in that it comprises the following steps: S1. By rotating the adjusting knob (27), the adjusting knob (27) drives the adjusting valve core (23) to rotate. The adjusting valve core (23) is provided with a plurality of oil drain grooves of different specifications. By rotating the adjusting valve core (23), shock absorber oil of different flow rates is released from the oil drain grooves.

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