Motorcycle shock absorber with preload convenient to adjust

Abstract

The utility model discloses a motorcycle shock absorber convenient for preload adjustment, and aims to solve the problems of complicated preload adjustment operation and low user utilization rate of the conventional shock absorber. The technical scheme comprises a working barrel, a gas cylinder, a piston, a piston rod and a spring, a jack mechanism is arranged on the outer wall of the working barrel and comprises an annular cylinder body, a piston sleeve and a hydraulic oil control piece; an oil pressure groove is formed between the annular cylinder body and the outer wall of the working barrel; the piston sleeve sleeves the working barrel and is in sealing fit with the oil pressure groove; the spring is arranged between the piston sleeve and a spring limiting seat on the piston rod; the hydraulic oil control piece is installed on the gas cylinder and communicated with the oil pressure groove through an oil pipe, drives the barrel-shaped piston through the adjusting screw to control hydraulic oil pressure, and pushes the piston sleeve to stretch out and draw back to adjust the spring compression amount. In addition, a flow regulating valve is arranged between the working barrel and the gas cylinder. According to the utility model, the preload is conveniently adjusted through hydraulic driving, the use experience of a user is improved, and the device has the advantages of compact structure and accurate adjustment.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle shock absorbers, and in particular to a motorcycle shock absorber with convenient preload adjustment, which realizes rapid adjustment of spring pre-compression through a hydraulic drive mechanism, thereby improving user operation convenience. Background Art

[0002] The preload adjustment function of motorcycle shock absorbers is primarily used to accommodate different rider weights or loads, balancing vehicle stability and comfort by adjusting the spring precompression. Existing preload adjustment is typically achieved by turning a preload adjustment nut, which is threaded onto the outer wall of the shock absorber cylinder. However, in practice, the adjustment process requires manual or tool-assisted rotation of the nut, which is cumbersome and leads most drivers to forgo adjustment due to the hassle. This reduces the preload adjustment function to a mere decoration, failing to realize its intended practical value.

[0003] Therefore, there is an urgent need for a motorcycle shock absorber preload adjustment structure that is easy to operate. Utility Model Content

[0004] In response to the problems in the prior art that the preload adjustment operation of motorcycle shock absorbers is cumbersome and the user usage rate is low, the utility model provides a motorcycle shock absorber with convenient preload adjustment, which realizes rapid adjustment of the spring precompression through a hydraulic drive mechanism, reduces the operation difficulty, and improves the user experience.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a motorcycle shock absorber with easily adjustable preload, comprising a working cylinder, a gas cylinder, a piston, a piston rod, and a spring; the gas cylinder is connected to the end of the working cylinder, the piston is disposed within the working cylinder and connected to the piston rod, which extends outside the working cylinder; the spring is sleeved on the piston rod to provide shock-absorbing and buffering force. The improvements are:

[0006] An upper bracket is arranged at the end of the piston rod, and a spring limit seat is arranged at a position of the piston rod near the upper bracket; a jack mechanism is arranged on the outer wall of the working cylinder, and the jack mechanism includes an annular cylinder body and a piston sleeve; the annular cylinder body is fixedly connected to the outer wall of the working cylinder, and an annular oil pressure groove is formed between its inner wall and the outer wall of the working cylinder; the piston sleeve is movably and sealingly sleeved on the working cylinder, and the inner wall of the piston sleeve is slidably and sealedly matched with the outer wall of the annular cylinder body; the spring is arranged between the piston sleeve and the spring limit seat, and the telescopic movement of the piston sleeve can push the spring limit seat to move axially along the piston rod, thereby adjusting the compression amount of the spring.

[0007] The jack mechanism also includes a hydraulic oil control component, which is installed on the gas cylinder; the hydraulic oil control component is connected to the oil pressure groove through an oil pipe, and drives the piston sleeve to extend and retract along the axial direction of the working cylinder by controlling the flow pressure of the hydraulic oil.

[0008] Further, the piston sleeve comprises a pressure receiving part and a spring matching part; the pressure receiving part is arranged in the oil pressure groove, a step is arranged between the outer wall of the pressure receiving part and the inner wall of the oil pressure groove, and the upper and lower parts of the step are matched with sealing rings respectively to realize sealing; the spring matching part is connected to the upper end of the pressure receiving part and comprises a horizontally arranged supporting plate, an annular limiting groove with an L-shaped cross section is formed in the supporting plate, and the lower end of the spring abuts against the annular limiting groove.

[0009] The hydraulic oil control member comprises an outer shell, a hydraulic oil cavity, a mounting ring, an adjusting screw and a knob; the outer shell is fixed to the gas cylinder, a cylindrical hydraulic oil cavity is formed in the outer shell, the hydraulic oil cavity is communicated with the oil pressure groove through an oil pipe, the mounting ring is fixed to the opening of the hydraulic oil cavity, and the inner hole of the mounting ring is screwed with the adjusting screw; one end of the adjusting screw extends into the hydraulic oil cavity and is threadedly connected with the barrel-shaped piston, the other end of the adjusting screw extends out of the outer shell and is connected with the knob; rotating the knob can drive the adjusting screw to rotate, thereby driving the barrel-shaped piston to axially extend or retract along the hydraulic oil cavity, and the hydraulic oil pressure pushes the piston sleeve to ascend or descend.

[0010] The working cylinder is connected with the gas cylinder through the base, the base is provided with an installation groove, and the installation groove is communicated with the internal cavities of the working cylinder and the gas cylinder; the installation groove is provided with a flow regulating valve, which is used for controlling the oil flow between the gas cylinder and the working cylinder.

[0011] The flow regulating valve comprises a valve body, a valve rod and a rotating cap; the valve body is fixed in the installation groove, a valve port is formed in the valve body, the valve rod is screwed in the inner ring of the valve body, an O-ring is arranged on the outer wall of the valve rod to realize sealing, the upper end of the valve rod is connected with the rotating cap, and the lower end of the valve rod is provided with a plugging surface; a plug rod is arranged at the center of the end surface of the plugging surface, and a flow-through groove is formed in the peripheral wall of the plug rod; rotating the rotating cap can drive the valve rod to axially move along the valve body, when the plug rod is inserted into the valve port, the oil flow is limited through the flow-through groove, and when the valve rod continues to move forward to cover the valve port with the plugging surface, the oil flow between the gas cylinder and the working cylinder is cut off.

[0012] The gas cylinder is provided with a floating piston, and the floating piston divides the internal cavity of the gas cylinder into an upper cavity and a lower cavity; the upper cavity is filled with nitrogen, and the lower cavity is communicated with the internal cavity of the working cylinder through oil, and the movement impact of the piston rod is buffered through the compression of nitrogen.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1、The operation is convenient: the piston sleeve is driven to extend or retract through the hydraulic oil control member, the structure of the traditional threaded adjusting nut is replaced, the user only needs to rotate the knob to realize the rapid adjustment of the spring preloading, the operation difficulty is greatly reduced, and the user's use willingness is improved.

[0015] 2. High adjustment accuracy: The hydraulic drive mechanism transmits power through oil pressure, enabling precise control of micro-displacement and avoiding adjustment errors caused by gaps in traditional screw adjustment, thereby improving the accuracy of pre-load setting.

[0016] 3. Compact structure: The annular cylinder body of the jack mechanism is fixed to the outer wall of the working cylinder, forming an integrated structure with the working cylinder, without occupying additional space, which is conducive to the miniaturization design of the shock absorber.

[0017] 4. Functional integration: The flow regulating valve can control the oil flow between the gas cylinder and the working cylinder, in combination with the nitrogen buffer of the floating piston, further optimizing the damping characteristics of the shock absorber, balancing stability and comfort.

[0018] The utility model will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the structural diagram of the specific embodiment of the utility model;

[0020] Figure 2 is a partial cross-sectional view of the specific embodiment of the utility model;

[0021] Figure 3 is a local transverse cross-sectional view of the specific embodiment of the utility model;

[0022] Figure 4 is Figure 3 is an enlarged view of position A;

[0023] Figure 5 is Figure 3 is an enlarged view of position B.

[0024] In the figure, 1, working cylinder; 2, gas cylinder; 3, piston; 4, piston rod; 5, spring; 6, upper support; 7, spring limit seat; 8, jack mechanism; 81, annular cylinder body; 82, piston sleeve; 821, pressure receiving part; 822, spring matching part; 823, step; 825, supporting plate; 826, annular limit groove; 83, oil groove; 84, hydraulic oil control piece; 843, mounting ring; 844, adjusting screw; 845, knob; 846, barrel-shaped piston; 847, oil nozzle; 85, oil pipe; 9, base; 91, mounting groove; 10, flow regulating valve; 101, valve body; 102, valve stem; 103, screw cap; 104, valve port; 106, plugging surface; 107, insertion rod; 108, flow-through groove; 11, floating piston; 111, upper chamber; 112, lower chamber; DETAILED DESCRIPTION

[0025] The utility model will be described in detail below through the embodiments, which are only used for further illustrating the utility model and cannot be understood as limiting the protection scope of the utility model.

[0026] As shown in Figure 1 — Figure 3 The embodiment discloses a motorcycle shock absorber which is a straight cylinder type oil-gas shock absorber and mainly comprises a working cylinder 1, a gas cylinder 2, a piston assembly, a spring 5, a jack mechanism 8, a flow regulating valve 10 and a floating piston 11. The core improvement lies in that the jack mechanism 8 driven by hydraulic pressure is used to replace the conventional threaded adjusting nut, so that the spring preloading can be conveniently adjusted; and the flow regulating valve 10 and the floating piston 11 are used to optimize the oil and gas buffering performance.

[0027] I. Detailed structure and connection relationship of each component

[0028] 1. Connection of the working cylinder 1 and the gas cylinder 2

[0029] The top of the working cylinder 1 is fixedly connected with the bottom of the gas cylinder 2 through a base 9. The upper end surface of the base 9 is welded and sealed with the bottom of the gas cylinder 2, and the lower end surface is threadedly connected with the top of the working cylinder 1.

[0030] 2. Piston assembly and spring 5

[0031] The piston 3 is a disc-shaped metal piece, the outer diameter of which is slightly smaller than the inner diameter of the working cylinder 1 by 0.05-0.1 mm, and the piston 3 is embedded in the working cylinder 1 and can slide along the axial direction. A through hole is formed in the center of the piston 3, the lower end of the piston rod 4 passes through the through hole and is threadedly connected with the piston 3, and an O-ring is arranged between the piston 3 and the piston rod 4 to realize sealing.

[0032] The piston rod 4 is connected with the piston 3 at the lower end and extends out of the working cylinder 1 at the upper end and is fixedly connected with an upper support 6. The upper support 6 is fixedly connected with the top end of the piston rod 4 and is used for mounting the rear swing arm of the motorcycle.

[0033] The spring 5 is a spiral spring, which is sleeved on the piston rod 4, abuts against the lower end of the piston sleeve 82 at the lower end and abuts against the lower end surface of the spring limiting seat 7 at the upper end.

[0034] 3. Spring limiting seat 7 and jack mechanism 8

[0035] The spring limiting seat 7 is a disc-shaped metal piece made of Q235 steel, which is sleeved on the piston rod 4 and the lower end surface of which is in contact with the upper end of the spring 5.

[0036] As shown in Figure 1 、 Figure 5 The jack mechanism 8 is installed on the middle part of the outer wall of the working cylinder 1 and is composed of an annular cylinder body 81, a piston sleeve 82 and a hydraulic oil control piece 84.

[0037] The annular cylinder body 81 is a circular metal part, whose inner diameter matches the outer diameter of the working cylinder 1 and is fixed to the outer wall of the working cylinder 1 by welding. An annular oil pressure groove 83 is formed between the inner wall of the annular cylinder body 81 and the outer wall of the working cylinder 1.

[0038] The piston sleeve 82 is a cylindrical metal part that is movably and sealingly sleeved on the working cylinder 1. The piston sleeve 82 includes:

[0039] Pressure-bearing part 821: located in the oil pressure groove 83, the clearance between the inner wall and the outer wall of the working cylinder 1 is 0.08mm; two steps 823 are provided between the outer wall of the pressure-bearing part 821 and the inner wall of the oil pressure groove 83, and the cross-section of the nitrile rubber sealing ring is embedded in the two steps respectively to realize the dynamic seal between the piston sleeve 82 and the oil pressure groove 83.

[0040] Spring engagement portion 822: Connected to the upper end of pressure-receiving portion 821, it extends upward to the outside of spring 5. It comprises a horizontal, disc-shaped support plate 825. An L-shaped annular retaining groove 826 is defined at its edge. The upper end of spring 5 abuts within this retaining groove 826, limiting radial deflection of spring 5 via the groove's walls.

[0041] Hydraulic oil control component 84: installed on the peripheral wall of gas cylinder 2, consisting of a housing 841, a hydraulic oil chamber 842, a mounting ring 843, an adjusting screw 844 and a knob 845:

[0042] The outer shell 841 is a cylindrical metal shell with a cylindrical hydraulic oil chamber 842 formed inside.

[0043] The mounting ring 843 is a circular metal part, which is fixed to the opening of the hydraulic oil chamber 842 by threaded connection. A threaded hole is opened at the top of the hydraulic oil chamber 842.

[0044] Adjusting screw 844: The lower end extends into the hydraulic oil chamber 842 and is threadedly connected to the barrel piston 846; the upper end of the adjusting screw 844 passes through the center hole of the mounting ring 843 and extends to the outside of the housing 841, and the end is fixedly connected to the knob 845.

[0045] The oil pipe 85 is a rubber hose, one end of which is connected to the bottom of the hydraulic oil chamber 842 through the oil nozzle 847, and the other end is connected to the bottom of the oil pressure groove 83. An oil hole is provided at the bottom of the oil pressure groove 83, and the oil pipe 85 is threadedly connected to the oil hole.

[0046] 4. Flow control valve 10

[0047] Specific as Figure 4 As shown, the flow control valve 10 is installed in the installation groove 91 of the base 9. The installation groove 91 is a circular groove. Its specific structure is:

[0048] Valve body 101: material brass, embedded in the installation groove 91 and threaded with the base 9. Valve body 101 is internally provided with a valve port 104.

[0049] Valve stem 102: screwed in the inner ring of valve body 101, the outer wall is provided with an O-ring, in contact with the inner wall of valve body 101 for sealing. The upper end of valve stem 102 is fixedly connected with a screw cap 103, and the lower end is provided with a plugging surface 106.

[0050] Plug rod 107: vertically arranged at the center of the end surface of plugging surface 106; two flow grooves 108 are provided on the peripheral wall of plug rod 107 and are distributed symmetrically along the axial direction.

[0051] 5. Floating piston 11

[0052] Floating piston 11 is a disc-shaped metal piece located in the middle of the inner cavity of gas cylinder 2, which divides gas cylinder 2 into upper chamber 111 and lower chamber 112. Upper chamber 111 is filled with nitrogen gas with an initial pressure of 3-5 MPa, and lower chamber 112 is provided on the inner wall of gas cylinder 2 through oil passage 201, with a diameter of 5 mm and is in communication with the internal chamber of working cylinder 1. The internal chamber of working cylinder 1 is filled with damping oil. The outer wall of floating piston 11 is in clearance fit with the inner wall of gas cylinder 2 with a clearance of 0.05 mm, and is provided with an O-ring for sealing.

[0053] 1. Preload adjustment process

[0054] When it is necessary to increase the preload to improve the stability of the vehicle, the user rotates the knob 845 of the jack mechanism 8 clockwise, which drives the adjustment screw 844 to rotate. Since the adjustment screw 844 is in threaded transmission with the barrel-shaped piston 846, the barrel-shaped piston 846 moves downward along the hydraulic oil cavity 842, compressing the oil in the hydraulic oil cavity 842, and the oil pressure rises. The high-pressure oil enters the oil pressure groove 83 through the oil pipe 85, pushing the pressure receiving part 821 of the piston sleeve 82 to move upward along the annular cylinder 81. Since the annular cylinder 81 is fixedly connected to the working cylinder 1, the piston sleeve 82 slides upward relative to the working cylinder 1. The spring fitting part 822 of the piston sleeve 82 pushes the spring limit seat 7 upward, thereby compressing the spring 5 and increasing its pre-compression amount, completing the preload increase adjustment.

[0055] When it is necessary to reduce the preload to improve comfort, the user rotates the knob 845 counterclockwise, the adjustment screw 844 rotates in the opposite direction, the barrel-shaped piston 846 moves upward along the hydraulic oil cavity 842, the oil pressure in the hydraulic oil cavity 842 decreases. The oil in the oil pressure groove 83 flows back to the hydraulic oil cavity 842 through the oil pipe 85, and the piston sleeve 82 moves downward under the action of the spring 5, releasing the pushing force on the spring limit seat 7, reducing the pre-compression amount of the spring 5, completing the preload reduction adjustment.

[0056] 2. Shock absorption and buffering process

[0057] When the motorcycle is running, the wheel is impacted to drive the piston rod 4 to compress the shock-absorbing oil in the working cylinder 1 downward, and the shock-absorbing oil pushes the piston 3 to move downward. The shock-absorbing oil below the piston 3 flows to the upper side of the piston 3 through the damping holes with a diameter of 0.8 mm and a number of 8, to form a damping force; at the same time, the oil liquid in the lower chamber is compressed by the piston rod 4, the oil liquid pushes the floating piston 11 to move upward, and the nitrogen in the upper chamber 111 is compressed, the compressibility of the nitrogen is used to absorb the impact energy, and buffering is realized. When the wheel rebounds, the piston rod 4 moves upward, and the spring 5 and the elastic force of the nitrogen push the piston 3 to reset, and a shock-absorbing cycle is completed.

[0058] 3. The function of the flow regulating valve 10

[0059] The flow of the oil liquid between the gas cylinder 2 and the working cylinder 1 can be adjusted by rotating the cap 103 of the flow regulating valve 10:

[0060] When the cap 103 is completely loosened, the valve rod 102 moves upward, the plug rod 107 completely exits the valve port 104, the oil liquid flows freely through the valve port 104, the damping is small, and the vehicle is more comfortable to ride;

[0061] When the cap 103 is tightened, the valve rod 102 moves downward, the plug rod 107 is inserted into the valve port 104, and the oil liquid flow is limited only through the flow-through groove 108, the oil liquid flow is reduced, the damping is increased, and the stability of the vehicle is improved;

[0062] When the valve rod 102 continues to move forward to completely cover the valve port 104 by the blocking surface 106, the oil liquid is cut off, the shock absorber is locked, and the vehicle cannot be compressed, such as when it is used for maintenance.

[0063] Three, effect verification of the embodiment

[0064] The embodiment realizes the "one-key" operation of the pre-load adjustment through the hydraulic-driven jack mechanism 8, that is, the adjustment can be completed by rotating the knob, compared with the traditional threaded adjusting nut which needs to be assisted by a tool and needs to be rotated for many times, usually 5-10 times, and the adjusting time is shortened from about 30 seconds to 5 seconds, so that the user's willingness to use is significantly improved. At the same time, the cooperation design of the flow regulating valve 10 and the floating piston 11 makes the damping characteristics of the shock absorber switchable between the "comfortable-sport" modes, and the different road conditions are considered. Through bench testing, the pre-load adjustment repeatability of the embodiment is ≤±0.5 mm of spring compression amount, and the adjusting force is ≤50 N (the force required for rotating the knob), which is better than the adjusting accuracy and adjusting force of the traditional structure.

[0065] After the above technical scheme is adopted, the following technical effects can be achieved:

[0066] 1. Convenient adjustment operation: the hydraulic oil control member drives the piston sleeve to extend and retract, replacing the structure of the traditional threaded adjusting nut, so that the user only needs to rotate the knob to realize the rapid adjustment of the spring pre-load, greatly reducing the operation difficulty and improving the user's willingness to use.

[0067] 2. High adjustment accuracy: The hydraulic drive mechanism transmits power through oil pressure, enabling precise control of micro-displacement and avoiding adjustment errors caused by gaps in traditional screw adjustment, thereby improving the accuracy of pre-load setting.

[0068] 3. Compact structure: The annular cylinder body of the jack mechanism is fixed to the outer wall of the working cylinder, forming an integrated structure with the working cylinder, without occupying additional space, which is beneficial to the miniaturization design of the shock absorber.

[0069] 4. Functional integration: The flow regulating valve can control the oil flow between the gas cylinder and the working cylinder, in combination with the nitrogen buffer of the floating piston, further optimizing the damping characteristics of the shock absorber, balancing stability and comfort.

Claims

1. A motorcycle shock absorber with convenient preload adjustment, comprising a working cylinder (1), a gas cylinder (2), a piston (3), a piston rod (4) and a spring (5); the gas cylinder (2) is connected to the end of the working cylinder (1); the piston (3) is arranged in the working cylinder (1) and connected to the piston rod (4), and the piston rod (4) extends out of the working cylinder (1); the spring (5) is sleeved on the piston rod (4); and the characteristics are: An upper bracket (6) is provided at the end of the piston rod (4), and a spring limit seat (7) is provided at a position of the piston rod (4) close to the upper bracket (6); a jack mechanism (8) is provided on the outer wall of the working cylinder (1), and the jack mechanism (8) includes an annular cylinder body (81) and a piston sleeve (82); the annular cylinder body (81) is fixed to the outer wall of the working cylinder (1), and an annular oil pressure groove (83) is formed between the inner wall of the annular cylinder body and the outer wall of the working cylinder (1); the piston sleeve (82) is movably and sealingly sleeved on the working cylinder (1), and the inner wall of the piston sleeve (82) is in contact with the annular cylinder body. The outer wall of the body (81) is slidingly sealed; the spring (5) is arranged between the piston sleeve (82) and the spring limit seat (7), and the telescopic movement of the piston sleeve (82) can push the spring limit seat (7) to move axially along the piston rod (4), thereby adjusting the compression amount of the spring (5); the jack mechanism (8) also includes a hydraulic oil control component (84), which is installed on the gas cylinder (2); the hydraulic oil control component (84) is connected to the oil pressure groove (83) through an oil pipe (85), and drives the piston sleeve (82) to telescope axially along the working cylinder (1) by controlling the flow pressure of the hydraulic oil.

2. The motorcycle shock absorber with convenient preload adjustment according to claim 1, characterized in that: The piston sleeve (82) includes a pressure-bearing portion (821) and a spring-matching portion (822); the pressure-bearing portion (821) is placed in the oil pressure groove (83), and a step (823) is provided between the outer wall of the pressure-bearing portion and the inner wall of the oil pressure groove (83), and the upper and lower parts of the step (823) respectively cooperate with sealing rings to achieve sealing; the spring-matching portion (822) is connected to the upper end of the pressure-bearing portion (821), and includes a horizontally arranged supporting plate (825), and the supporting plate (825) is provided with an annular limiting groove (826) with an "L"-shaped cross section, and the lower end of the spring (5) abuts against the annular limiting groove (826).

3. The motorcycle shock absorber with convenient preload adjustment according to claim 1, characterized in that: The hydraulic oil control member (84) comprises a housing (841), a hydraulic oil chamber (842), a mounting ring (843), an adjusting screw (844) and a knob (845); the housing (841) is fixed to the gas cylinder (2), and a cylindrical hydraulic oil chamber (842) is formed inside the housing. The hydraulic oil chamber (842) is connected to the oil pressure groove (83) through an oil pipe (85); the mounting ring (843) is fixed to the opening of the hydraulic oil chamber (842), and its inner hole is An adjusting screw (844) is threadedly connected; one end of the adjusting screw (844) extends into the hydraulic oil chamber (842) and is threadedly connected to the barrel piston (846), and the other end extends outside the housing (841) and is connected to a knob (845); rotating the knob (845) can drive the adjusting screw (844) to rotate, thereby driving the barrel piston (846) to axially extend and retract along the hydraulic oil chamber (842), and pushing the piston sleeve (82) up and down through the hydraulic oil pressure.

4. The motorcycle shock absorber with convenient preload adjustment according to claim 1, characterized in that: The working cylinder (1) is connected to the gas cylinder (2) via a base (9). A mounting groove (91) is provided on the base (9). The mounting groove (91) communicates with the internal chambers of the working cylinder (1) and the gas cylinder (2). A flow regulating valve (10) is installed in the mounting groove (91).

5. The motorcycle shock absorber with convenient preload adjustment according to claim 4, characterized in that: The flow regulating valve (10) comprises a valve body (101), a valve stem (102) and a screw cap (103); the valve body (101) is fixed in a mounting groove (91), and a valve port (104) is provided inside the valve body; the valve stem (102) is screwed into the inner ring of the valve body (101), and an O-ring is provided on the outer wall to achieve sealing; the upper end of the valve stem (102) is connected to the screw cap (103), and the lower end is provided with a sealing surface (106); the end surface of the sealing surface (106) A plug rod (107) is provided at the center, and a flow groove (108) is provided on the peripheral wall of the plug rod (107); rotating the screw cap (103) can drive the valve stem (102) to move axially along the valve body (101); when the plug rod (107) is inserted into the valve port (104), oil flow is limited through the flow groove (108); when the valve stem (102) continues to move forward until the sealing surface (106) completely covers the valve port (104), the oil flow between the gas cylinder (2) and the working cylinder (1) is cut off.

6. The motorcycle shock absorber with convenient preload adjustment according to claim 1, characterized in that: A floating piston (11) is provided in the gas cylinder (2), and the floating piston (11) divides the inner cavity of the gas cylinder (2) into an upper chamber (111) and a lower chamber (112); the upper chamber (111) is filled with nitrogen, and the lower chamber (112) is connected to the inner chamber of the working cylinder (1) through oil.

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