Nitrogen damper and vibration damping method therefor

Abstract

Disclosed are a nitrogen damper and a vibration damping method therefor, relating to the technical field of dampers. A piston rod (3) is slidably connected to an oil reservoir tube (13); a lower connecting mount (1) is fixed to one end of the piston rod (3); an upper connecting mount (7) is mounted at one end of the oil reservoir tube (13), and a compression hydraulic buffer adjustment valve assembly (8), a compression high- / low-speed adjustment valve assembly (9), and a nitrogen reservoir (11) are mounted on the upper connecting mount (7); a central fixed tube (14) is fixed to one end of the piston rod (3) located inside the oil reservoir tube (13); a piston valve assembly (5) is fixed to an outer wall of the central fixed tube (14), and the piston valve assembly (5) divides the oil reservoir tube (13) into a rebound chamber (100) and a compression chamber (200); and a hydraulic buffer rod (62) of a compression hydraulic buffer assembly (6) is in communication with the compression hydraulic buffer adjustment valve assembly (8).

Description

A nitrogen vibration damper and its vibration damping method Technical Field

[0001] This invention relates to the field of vibration damper technology, and in particular to a nitrogen vibration damper and its vibration damping method. Background Technology

[0002] The inventors are aware that the compression hydraulic buffer structure of nitrogen shock absorbers typically involves adding a buffer piston to the upper end of the main piston valve system. When the nitrogen shock absorber is at its limit compression stroke, the buffer piston enters the hydraulic buffer sleeve, forming a sealed cavity with the hydraulic buffer sleeve to achieve the hydraulic buffering effect. The compression change curve is controlled by adjusting the distance and size of the openings on the side of the hydraulic buffer sleeve to meet actual usage requirements.

[0003] Although the aforementioned nitrogen shock absorber's compression-hydraulic damping structure can achieve a hydraulic damping effect within a short stroke at the compression limit, the damping force of this structure suddenly increases within a short stroke, causing discomfort to the driver. It also has the drawback of insufficient damping stroke.

[0004] Therefore, there is an urgent need in this field for a nitrogen vibration damper and its vibration reduction method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a nitrogen shock absorber and its damping method to solve the problems existing in the prior art, improve the performance of the compression hydraulic buffer system, increase the hydraulic buffer stroke, achieve the purpose of progressive damping hydraulic buffering, and thereby reduce the discomfort of the driver.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention discloses a nitrogen shock absorber, comprising an oil reservoir, a piston rod, a lower connecting seat, an upper connecting seat, a central fixing pipe, a piston valve system assembly, and a compression hydraulic buffer assembly: the oil reservoir is filled with hydraulic oil; the piston rod is slidably connected to the oil reservoir, with one end of the piston rod located inside the oil reservoir and the other end located outside the oil reservoir; the lower connecting seat is fixed to the end of the piston rod located outside the oil reservoir; the upper connecting seat is installed at the end of the oil reservoir away from the lower connecting seat, and the upper connecting seat is equipped with a compression hydraulic buffer regulating valve system assembly, a compression high and low speed regulating valve system assembly, and a nitrogen cylinder; the compression hydraulic buffer regulating valve system assembly is connected to the compression high and low speed regulating valve system assembly, the compression high and low speed regulating valve system assembly is connected to the nitrogen cylinder, and the compression high and low speed regulating valve system assembly is also connected to the interior of the oil reservoir; the central fixing pipe is fixed to the piston rod located at the lower connecting seat. Inside the oil reservoir, at one end, the side wall of the central fixed tube near the piston rod has several central tube first oil passage holes; the piston valve system assembly is fixed to the outer wall of the central fixed tube, and the piston valve system assembly divides the oil reservoir into a recovery chamber and a compression chamber. The side of the piston valve system assembly near the lower connecting seat is the recovery chamber, and the side of the piston valve system assembly near the upper connecting seat is the compression chamber. The piston valve system assembly includes a main piston and a buffer piston. The main piston has several first piston through holes, and the buffer piston has several second piston through holes. The side wall of the central fixed tube also has several central tube second oil passage holes evenly distributed circumferentially, and the central tube second oil passage holes are located between the main piston and the buffer piston; the compression hydraulic buffer assembly includes a hydraulic buffer rod, which is disposed in the compression chamber and is connected to the compression hydraulic buffer regulating valve system assembly.

[0008] In one exemplary embodiment, the piston valve system assembly further includes a springback buffer piston and a compression buffer piston. The springback buffer piston is located on the side of the main piston away from the buffer piston, and the compression buffer piston is located on the side of the buffer piston away from the main piston. A guide is installed at the end of the oil reservoir near the lower connecting seat. The side wall of the guide is provided with a plurality of first oil pressure regulating through holes. When the piston valve system assembly moves toward the guide, the springback buffer piston can be inserted into the guide. The compression hydraulic buffer assembly further includes a hydraulic buffer sleeve. The hydraulic buffer sleeve is installed at the end of the oil reservoir near the upper connecting seat. When the piston valve system assembly moves toward the hydraulic buffer sleeve, the compression buffer piston can be inserted into the hydraulic buffer sleeve.

[0009] In an exemplary embodiment, the sidewall of the hydraulic buffer sleeve is provided with a plurality of second oil pressure regulating through holes.

[0010] In an exemplary embodiment, the nitrogen shock absorber further includes an end hydraulic buffer damping adjustment structure. The end hydraulic buffer damping adjustment structure includes a first buffer adjustment core, which is connected to the upper connecting seat. The first buffer adjustment core is partially located in the oil passage of the upper connecting seat. The hydraulic buffer sleeve is provided with a third oil pressure adjustment through hole. An adjustment cavity is formed between the upper connecting seat and the hydraulic buffer sleeve. The adjustment cavity is selectively connected to the third oil pressure adjustment through hole. The first buffer adjustment core can move relative to the upper connecting seat to adjust the communication volume between the adjustment cavity and the third oil pressure adjustment through hole.

[0011] In an exemplary embodiment, the hydraulic buffer sleeve is threadedly connected to the outer side of the hydraulic buffer rod, and a clamping protrusion is provided on the outer wall of the hydraulic buffer sleeve. The oil reservoir and the upper connecting seat are threadedly connected, and the oil reservoir and the upper connecting seat can clamp the clamping protrusion.

[0012] In an exemplary embodiment, the outer wall of the guide is provided with a first guide groove, and the inner wall of the oil reservoir is provided with a second guide groove. The first guide groove and the second guide groove are positioned opposite each other, and a first retaining spring is engaged in both the first guide groove and the second guide groove.

[0013] In one exemplary embodiment, the system further includes a springback adjustment assembly, which includes an adjustment wheel, a spherical ejector pin, a push rod, a springback conical core, and a fastening plug. The adjustment wheel is threadedly connected to the lower connecting seat and has a conical portion. The push rod is slidably connected to the piston center channel of the piston rod. One end of the push rod is fixed with the spherical ejector pin, and the end of the spherical ejector pin away from the push rod abuts against the conical portion. The other end of the push rod is connected to the springback conical core. The fastening plug is installed in the central fixing tube, and a first oil passage hole of the central tube is provided between the springback conical core and the fastening plug.

[0014] In an exemplary embodiment, the compressed hydraulic buffer regulating valve system assembly includes a buffer compression valve system, a second buffer regulating core, and a buffer threaded positioning seat. The buffer compression valve system is fixed to the lower outer wall of the buffer threaded positioning seat. The buffer compression valve system is provided with a buffer compression valve piston through hole. A first valve plate is connected to the buffer compression valve piston through hole. A first regulating core through hole is provided at the center of the buffer threaded positioning seat. The upper end of the first regulating core through hole is also threadedly connected to the second buffer regulating core. An oil passage hole for the first regulating core is provided on the side wall of the buffer threaded positioning seat.

[0015] In one exemplary embodiment, there are two first valve plates, which are located at both ends of the piston through hole of the buffer compression valve, and both first valve plates partially block the opening of the piston through hole of the buffer compression valve.

[0016] In an exemplary embodiment, the high and low speed compression regulating valve system assembly includes a high and low speed compression valve system, a spring, a low speed regulating core, a high and low speed regulating threaded positioning seat, and a high speed regulating wheel. The high and low speed compression valve system is installed at the lower end of the high and low speed regulating threaded positioning seat. The high and low speed compression valve system is provided with a high and low speed compression valve piston through hole. A second valve plate is connected to the high and low speed compression valve piston through hole. The high speed regulating wheel is installed at the center of the high and low speed regulating threaded positioning seat. The spring is provided between the second valve plate and the high speed regulating wheel. A second regulating core through hole is provided at the center of the high speed regulating wheel. The low speed regulating core is threadedly connected to the upper end of the second regulating core through hole. A second regulating core oil passage hole is provided on the side wall of the high speed regulating wheel.

[0017] In one exemplary embodiment, a floating piston is slidably connected inside the nitrogen cylinder, the floating piston dividing the nitrogen cylinder into a nitrogen chamber and a hydraulic oil chamber, the nitrogen chamber being filled with nitrogen.

[0018] In one exemplary embodiment, the nitrogen cylinder has a nozzle cap at the end away from the compression high and low speed regulating valve system assembly.

[0019] This invention discloses a vibration reduction method for a nitrogen vibration damper, applicable to any of the nitrogen vibration dampers described above, comprising the following steps:

[0020] S1. When the nitrogen shock absorber is compressed from the initial state, part of the hydraulic oil in the compression chamber passes through the second oil passage of the central tube and the first piston passage on the main piston and enters the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder, pushing the floating piston and compressing the nitrogen in the nitrogen chamber, increasing the nitrogen counterforce.

[0021] S2. When the nitrogen shock absorber is further compressed, part of the hydraulic oil in the compression chamber first passes through the second piston through hole on the buffer piston, and then through the first piston through hole on the main piston to enter the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder.

[0022] S3. When the nitrogen shock absorber is further compressed, part of the hydraulic oil in the compression chamber first passes through the second piston through hole on the buffer piston, and then passes through the first piston through hole on the main piston to enter the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder. At the same time, the compression buffer piston enters the hydraulic buffer sleeve.

[0023] S4. When the nitrogen shock absorber is further compressed and reaches its limit compression stroke, part of the hydraulic oil in the compression chamber first passes through the second piston through hole on the buffer piston, then through the first piston through hole on the main piston and enters the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder. At the same time, the hydraulic buffer rod enters the center of the central fixed tube. At this time, the hydraulic oil in the hydraulic buffer rod enters the compression high and low speed regulating valve system assembly through the compression hydraulic buffer regulating valve system assembly, and finally flows to the hydraulic oil chamber in the nitrogen cylinder.

[0024] S5. When the nitrogen shock absorber is in the limit compression stroke for recovery, a part of the hydraulic oil in the recovery chamber enters the compression chamber through the first piston through hole of the main piston and the second piston through hole of the buffer piston in sequence. Another part of the hydraulic oil in the recovery chamber enters the compression chamber through the first oil passage hole of the central tube, the second oil passage hole of the central tube and the second piston through hole of the buffer piston in sequence. Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder flows from the hydraulic oil chamber to the compression chamber through the compression high and low speed regulating valve system assembly.

[0025] S6. When the nitrogen shock absorber is further restored, a portion of the hydraulic oil in the restoration chamber enters the compression chamber through the first piston through hole of the main piston, the second oil passage hole of the central tube, and the central channel of the central fixed tube. Another portion of the hydraulic oil in the restoration chamber enters the compression chamber through the first oil passage hole of the central tube and the central channel of the central fixed tube. Under the action of the nitrogen reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder flows from the hydraulic oil chamber through the compression high and low speed regulating valve system assembly to the compression chamber.

[0026] S7. When the nitrogen shock absorber further recovers and is at its limit recovery stroke, a portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first piston through hole of the main piston, the second oil passage hole of the central tube, and the central channel of the central fixed tube. Another portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first oil passage hole of the central tube and the central channel of the central fixed tube. Under the action of the nitrogen reaction force, the hydraulic oil in the hydraulic oil chamber inside the nitrogen cylinder flows from the hydraulic oil chamber through the compression high and low speed regulating valve system assembly to the compression chamber; at the same time, the rebound buffer piston enters the guide.

[0027] This invention discloses a vibration reduction method for a nitrogen vibration damper, applicable to any of the nitrogen vibration dampers described above, comprising the following steps:

[0028] S1. When the nitrogen shock absorber is compressed from the initial state, part of the hydraulic oil in the compression chamber passes through the central channel of the central fixed tube, the second oil passage of the central tube, and the first piston through hole on the main piston and enters the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder, pushing the floating piston and compressing the nitrogen in the nitrogen chamber of the nitrogen cylinder, increasing the nitrogen counterforce.

[0029] S2. When the nitrogen shock absorber is further compressed, the hydraulic buffer rod enters the central channel of the central fixed tube. Part of the hydraulic oil in the compression chamber first passes through the second piston through hole on the buffer piston, and then through the first piston through hole on the main piston to enter the recovery chamber. Part of the hydraulic oil passes through the compression hydraulic buffer regulating valve system assembly, the central channel of the hydraulic buffer rod, the second oil passage hole of the central tube, and the first piston through hole to enter the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder.

[0030] S3. When the nitrogen shock absorber is further compressed, the hydraulic buffer rod enters the central channel of the central fixed tube. Part of the hydraulic oil in the compression chamber first passes through the second piston through hole on the buffer piston, and then through the first piston through hole on the main piston to enter the recovery chamber. Part of the hydraulic oil passes through the compression hydraulic buffer regulating valve system assembly, the central channel of the hydraulic buffer rod, the second oil passage hole of the central tube, and the first piston through hole to enter the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly to the hydraulic oil chamber in the nitrogen cylinder. At the same time, the compression buffer piston enters the compression hydraulic buffer assembly. The compression buffer piston and the compression hydraulic buffer assembly form a closed cavity. The adjustment of the end hydraulic buffer damping adjustment structure connects the adjustment cavity, the third oil pressure regulating through hole, the closed cavity, and the external oil reservoir. The magnitude of the end compression hydraulic buffer damping force is adjusted by controlling the flow rate of the adjustment cavity by rotating the first buffer regulating core in the end hydraulic buffer damping adjustment structure.

[0031] S4. When the nitrogen shock absorber is further compressed and reaches the limit compression stroke, the hydraulic oil in the compression chamber enters the recovery chamber through the second piston through hole and the first piston through hole. At the same time, the hydraulic buffer rod enters the central channel of the central fixed tube and covers the second oil passage of the central tube of the central fixed tube, forming another sealed cavity. The other part of the hydraulic oil passes through the compression high and low speed regulating valve system assembly and finally flows to the hydraulic oil chamber in the nitrogen cylinder.

[0032] S5. When the nitrogen shock absorber is at its limit compression stroke and begins to recover, the hydraulic buffer rod covers the second oil passage of the central tube of the central fixed tube. A portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first piston through hole and the second piston through hole in sequence. Another portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first oil passage of the central tube, the rebound adjustment assembly, the central channel of the hydraulic buffer rod, and the piston through hole of the buffer compression valve of the compression hydraulic buffer adjustment valve system assembly in sequence. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder flows from the hydraulic oil chamber to the compression chamber through the compression high and low speed adjustment valve system assembly.

[0033] S6. When the nitrogen shock absorber is further restored, the hydraulic buffer rod does not cover the second oil passage of the central tube of the central fixed tube. Part of the hydraulic oil in the restoration chamber enters the central channel of the hydraulic buffer rod through the first piston through hole and the second oil passage of the central tube. The other part of the hydraulic oil in the restoration chamber enters the central channel of the hydraulic buffer rod through the rebound adjustment assembly of the first oil passage of the central tube. The hydraulic oil in the central channel of the hydraulic buffer rod enters the compression chamber through the compression hydraulic buffer adjustment valve system assembly. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder flows from the hydraulic oil chamber to the compression chamber through the compression high and low speed adjustment valve system assembly.

[0034] S7. When the nitrogen shock absorber is further restored, the hydraulic buffer rod leaves the central fixed tube. A part of the hydraulic oil in the restoration chamber enters the compression chamber through the first piston through hole and the second oil passage hole of the central tube. Another part of the hydraulic oil in the restoration chamber enters the compression chamber through the first oil passage hole of the central tube and the rebound adjustment assembly. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder flows from the hydraulic oil chamber in the nitrogen cylinder through the compression high and low speed adjustment valve system assembly to the compression chamber.

[0035] S8. When the nitrogen shock absorber further recovers and is at its limit recovery stroke, a portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first piston through hole and the second oil passage hole of the central tube. Another portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first oil passage hole of the central tube and the rebound adjustment assembly. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder flows from the hydraulic oil chamber in the nitrogen cylinder through the compression high and low speed adjustment valve system assembly to the compression chamber. At the same time, the rebound buffer piston enters the guide to form a sealed cavity.

[0036] The present invention achieves the following technical effects compared to the prior art:

[0037] This invention improves the performance of the original adjustable hydraulic buffer system by using a three-piston control system consisting of a main piston, a buffer piston, and a compression buffer piston within the piston valve system assembly, and a compression hydraulic buffer assembly with an added hydraulic buffer rod. This increases the hydraulic buffer stroke and achieves progressive damping hydraulic buffering. Furthermore, the external compression hydraulic buffer regulating valve system assembly allows for more convenient adjustment of the damping force of the compression hydraulic buffer.

[0038] The compression hydraulic buffer assembly and the end hydraulic buffer damping adjustment structure further improve the performance of the original adjustable compression hydraulic buffer system, increase the hydraulic buffer stroke, realize progressive damping hydraulic buffering, and make it more convenient to adjust the damping force of the compression hydraulic buffer through the external compression hydraulic buffer adjustment valve system assembly. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 is a schematic diagram of the first structure of the nitrogen vibration damper provided in an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the second structure of the nitrogen vibration damper provided in the embodiment of the present invention.

[0042] Figure 3 is a partial enlarged view of the rebound adjustment component in the nitrogen vibration damper provided in an embodiment of the present invention;

[0043] Figure 4 is a partial enlarged view of the piston valve system assembly in the nitrogen damper provided in an embodiment of the present invention;

[0044] Figure 5 is a first partial enlarged view of the compression hydraulic buffer assembly in the nitrogen shock absorber provided in an embodiment of the present invention;

[0045] Figure 6 is a second partial enlarged view of the compression hydraulic buffer assembly in the nitrogen shock absorber provided in an embodiment of the present invention;

[0046] Figure 7 is a partial enlarged view of the compression high and low speed regulating valve system assembly in the nitrogen vibration damper provided in an embodiment of the present invention;

[0047] Figure 8 is a first partial enlarged view of the compression hydraulic buffer regulating valve system assembly in the nitrogen shock absorber provided in an embodiment of the present invention;

[0048] Figure 9 is a second partial enlarged view of the compression hydraulic buffer regulating valve system assembly in the nitrogen shock absorber provided in an embodiment of the present invention;

[0049] Figure 10 is a schematic diagram of the hydraulic oil flow direction in step S1 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0050] Figure 11 is a schematic diagram of the hydraulic oil flow direction in step S2 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0051] Figure 12 is a schematic diagram of the hydraulic oil flow direction in step S3 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0052] Figure 13 is a schematic diagram of the hydraulic oil flow direction in step S4 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0053] Figure 14 is a schematic diagram of the hydraulic oil flow direction in step S5 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0054] Figure 15 is a schematic diagram of the hydraulic oil flow direction in step S6 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0055] Figure 16 is a schematic diagram of the hydraulic oil flow direction in step S7 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0056] Figure 17 is a schematic diagram of the hydraulic oil flow direction of the high and low speed regulating valve system in the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0057] Figure 18 is a schematic diagram of the hydraulic oil flow direction of the compression hydraulic buffer regulating valve system in the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0058] Figure 19 is a schematic diagram of the hydraulic oil flow direction of the rebound adjustment component in the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0059] Figure 20 is a schematic diagram of the hydraulic oil flow direction in step S1 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0060] Figure 21 is a schematic diagram of the hydraulic oil flow direction in step S2 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0061] Figure 22 is a schematic diagram of the hydraulic oil flow direction in step S3 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0062] Figure 23 is a schematic diagram of the hydraulic oil flow direction in step S4 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0063] Figure 24 is a partially enlarged view of the hydraulic oil flow direction in step S4 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0064] Figure 25 is a schematic diagram of the hydraulic oil flow direction in step S5 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0065] Figure 26 is a schematic diagram of the hydraulic oil flow direction in step S6 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0066] Figure 27 is a schematic diagram of the hydraulic oil flow direction in step S7 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0067] Figure 28 is a schematic diagram of the hydraulic oil flow direction in step S8 of the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0068] Figure 29 is a schematic diagram of the hydraulic oil flow direction of the high and low speed regulating valve system in the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0069] Figure 30 is a schematic diagram of the hydraulic oil flow direction of the compression hydraulic buffer regulating valve system in the vibration reduction method of the nitrogen vibration damper provided in the embodiment of the present invention;

[0070] Figure 31 is a graph showing the changes in displacement of the piston rod relative to the oil reservoir and compression damping force of the damper during the compression process when the method provided in Embodiment 3 of the present invention is executed.

[0071] In the diagram: 1. Lower connecting seat; 2. Springback adjustment assembly; 21. Adjusting wheel; 22. Spherical ejector pin; 23. Ejector rod; 24. Springback conical core; 25. Fastening plug; 3. Piston rod; 4. Guide; 41. First hydraulic pressure adjustment through hole; 5. Piston valve system assembly; 51. Springback buffer piston; 52. Main piston; 521. First piston through hole; 53. Buffer piston; 531. Second piston through hole; 54. Compression buffer piston; 55. Opening and closing valve plate; 6. Compression hydraulic buffer assembly; 61. Hydraulic buffer sleeve; 611. Second hydraulic pressure adjustment through hole; 612. Third hydraulic pressure adjustment through hole; 62. Hydraulic buffer rod; 7. Upper connecting seat; 71. Second groove; 72. First groove 73. Groove; 8. Buffered hydraulic buffer regulating valve system assembly; 81. Buffered compression valve system; 811. Buffered compression valve piston through hole; 82. Second buffered regulating core; 83. Buffered threaded positioning seat; 831. First regulating core through hole; 832. First regulating core oil through hole; 84. First valve plate; 9. High and low speed regulating valve system assembly; 91. High and low speed compression valve system; 911. High and low speed compression valve piston through hole; 92. Spring; 93. Low speed regulating core; 94. High and low speed regulating threaded positioning seat; 95. High speed regulating wheel; 951. Second regulating core through hole; 952. Second regulating core oil through hole; 96. Second valve plate; 10. Floating piston; 11. Nitrogen cylinder; 12. Air nozzle cover; 13. Oil reservoir; 14. Central fixed pipe; 141. First oil passage hole of the central pipe; 142. Second oil passage hole of the central pipe; 15. End hydraulic buffer damping adjustment structure; 100. Restoration chamber; 200. Compression chamber; 300. Nitrogen shock absorber. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] The purpose of this invention is to provide a nitrogen shock absorber and its damping method to solve the problems existing in the prior art, improve the performance of the compression hydraulic buffer system, increase the hydraulic buffer stroke, achieve the purpose of progressive damping hydraulic buffering, and thereby reduce the discomfort of the driver.

[0074] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] Example 1

[0076] As shown in Figures 1-9, this embodiment provides a nitrogen shock absorber 300, including: an oil reservoir 13, a piston rod 3, a lower connecting seat 1, an upper connecting seat 7, a central fixing pipe 14, a piston valve system assembly 5, and a compression hydraulic buffer assembly 6. The oil reservoir 13 has a cylindrical structure and is filled with hydraulic oil. The piston rod 3 is slidably connected to one end of the oil reservoir 13; specifically, one end of the piston rod 3 is located inside the oil reservoir 13, and the other end is located outside the oil reservoir 13. The lower connecting seat 1 is fixed to the end of the piston rod 3 located outside the oil reservoir 13. The lower connecting seat 1 has an internal threaded hole, and one end of the piston rod 3 has an external thread, thus the lower connecting seat 1 and the piston rod 3 are threadedly connected. The upper connecting seat 7 is installed at the end of the oil reservoir 13 away from the lower connecting seat 1. The upper connecting seat 7 has an internal threaded hole, and the corresponding end of the oil reservoir 13 has an external thread, thereby allowing the upper connecting seat 7 and the oil reservoir 13 to be threadedly connected. In actual installation, the lower connecting seat 1 and the upper connecting seat 7 are used to connect the vehicle frame and the wheel axle, respectively, to achieve the installation of the nitrogen shock absorber 300. The upper connecting seat 7 is equipped with a compression hydraulic buffer regulating valve system assembly 8, a compression high / low speed regulating valve system assembly 9, and a nitrogen cylinder 11. The compression hydraulic buffer regulating valve system assembly 8 is connected to the compression high / low speed regulating valve system assembly 9, which is connected to the nitrogen cylinder 11. The compression high / low speed regulating valve system assembly 9 is also connected to the compression chamber inside the oil reservoir 13. The central fixing tube 14 is fixed to one end of the piston rod 3 located inside the oil reservoir 13. The central fixing tube 14 and the piston rod 3 can also be connected by threads. The end of the central fixing tube 14 near the piston rod 3 has an external thread, and the end of the piston rod 3 near the central fixing tube 14 has an internal thread, thus achieving a threaded connection. Several central tube first oil passage holes 141 are provided on the side wall of the end of the central fixing tube 14 near the piston rod 3 for the flow of hydraulic oil.

[0077] The piston valve system assembly 5 is fixed on the outer wall of the central fixed tube 14. The piston valve system assembly 5 divides the oil reservoir 13 into a recovery chamber 100 and a compression chamber 200. The side of the piston valve system assembly 5 closer to the lower connecting seat 1 is the recovery chamber 100, and the side of the piston valve system assembly 5 closer to the upper connecting seat 7 is the compression chamber 200. The piston valve system assembly 5 includes a main piston 52 and a buffer piston 53. The main piston 52 is closer to the recovery chamber than the buffer piston 53. The main piston 52 has several first piston through holes 521, and the buffer piston 53 has several second piston through holes 531. Both sides of the first piston through holes 521 and the second piston through holes 531 are covered by opening and closing valve plates 55. That is, opening and closing valve plates are provided at both openings of the first piston through holes 521 and the second piston through holes 531. The usage of the opening and closing valve plates 55 will be explained here with reference to Figure 3. Only the opening and closing valve plates on both sides of the first piston through hole 521 will be used as an example. It is easy to see from Figure 3 that the opening and closing valve plates 55 are annular valves. The first piston through-hole 521 has an inclined oil leakage hole at its lower left and upper right corners. When hydraulic oil flows from the recovery chamber 100 to the compression chamber 200, the hydraulic oil flows in through the oil leakage hole at the lower left corner, pushes open the opening and closing valve plate 55 on the right side, and flows into the compression chamber. Conversely, if hydraulic oil flows from the compression chamber 200 to the recovery chamber 100, the hydraulic oil flows in through the oil leakage hole at the upper right corner, pushes open the opening and closing valve plate 55 on the left side, and flows into the recovery chamber. The opening and closing valve plates on both sides of the second piston through-hole 531 work on the same principle, so they will not be described in detail. Several central tube second oil passage holes 142 are also evenly distributed circumferentially on the side wall of the central fixed tube 14. The central tube second oil passage holes 142 are located between the main piston 52 and the buffer piston 53 and are used for hydraulic oil to pass through. The compression hydraulic buffer assembly 6 includes a hydraulic buffer rod 62, which is disposed in the compression chamber 200 and is connected to the compression hydraulic buffer regulating valve system assembly 8.

[0078] When the nitrogen shock absorber 300 is compressed from its initial state, a portion of the hydraulic oil in the compression chamber passes through the second oil passage 142 of the central tube and the first piston through-hole 521 on the main piston 52 to enter the recovery chamber, while the other portion flows through the compression high / low speed regulating valve system assembly 9 into the nitrogen cylinder 11. When the nitrogen shock absorber 300 is further compressed, a portion of the hydraulic oil in the compression chamber first passes through the second piston through-hole 531 on the buffer piston 53, and then through the first piston through-hole 521 on the main piston 52 to enter the recovery chamber, while the other portion flows through the compression high / low speed regulating valve system assembly 9 into the nitrogen cylinder 11. When the nitrogen shock absorber 300 is compressed even further, a portion of the hydraulic oil in the compression chamber first passes through the second piston through-hole 531 on the buffer piston 53, and then through the first piston through-hole on the main piston 52 to enter the recovery chamber, while the other portion flows through the compression high / low speed regulating valve system assembly 9 into the nitrogen cylinder 11, while simultaneously the compression buffer piston 54 enters the hydraulic buffer sleeve 61. When the nitrogen damper 300 is further compressed and reaches its limit compression stroke, part of the hydraulic oil in the compression chamber first passes through the second piston through hole 531 on the buffer piston 53, and then through the first piston through hole on the main piston 52 to enter the recovery chamber 100. The other part of the hydraulic oil flows into the nitrogen cylinder 11 through the compression high and low speed regulating valve system assembly 9. At the same time, the hydraulic buffer rod 62 enters the center of the central fixed tube 14. At this time, the hydraulic oil in the hydraulic buffer rod 62 enters the compression high and low speed regulating valve system assembly 9 through the compression hydraulic buffer regulating valve system assembly 8, and finally flows into the nitrogen cylinder 11.

[0079] When the nitrogen shock absorber 300 is in the limit compression stroke for recovery, a portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber through the first piston through hole 521 of the main piston 52 and the second piston through hole 531 of the buffer piston 53 in sequence. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first oil passage hole of the central tube, the second oil passage hole of the central tube and the second piston through hole of the buffer piston 53 in sequence. Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber through the compression high and low speed regulating valve system assembly 9 to the compression chamber 200. When the nitrogen shock absorber 300 further recovers, a portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first piston through-hole 521 of the main piston 52 and the second oil passage 142 of the central tube. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber through the first oil passage 141 of the central tube and the piston center channel on the central fixed tube 14. Under the action of the nitrogen reaction force, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber through the compression high and low speed regulating valve system assembly 9 to the compression chamber. When the nitrogen shock absorber 300 recovers further, at the limit recovery stroke, a portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first piston through-hole of the main piston 52 and the second oil passage of the central tube. Another portion of the hydraulic oil in the recovery chamber enters the compression chamber through the first oil passage of the central tube and the piston center channel on the central fixed tube 14. The hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows to the compression chamber through the compression high and low speed regulating valve system assembly 9.

[0080] In this embodiment, as shown in FIG4, the piston valve system assembly 5 further includes a springback buffer piston 51 and a compression buffer piston 54. The springback buffer piston 51 is located on the side of the main piston 52 away from the buffer piston 53, and the compression buffer piston 54 is located on the side of the buffer piston 53 away from the main piston 52.

[0081] A guide 4 is installed at one end of the oil reservoir 13 near the lower connecting seat 1. The guide 4 is a cylindrical structure closed at one end. Several first oil pressure regulating holes 41 are provided on the side wall of the guide 4, and these holes are spaced apart along the horizontal direction shown in Figure 2. The diameter of each first oil pressure regulating hole 41 is the same, but it can also be gradually increased or decreased. When the piston valve assembly 5 moves toward the guide 4, the spring-loaded buffer piston 51 can be inserted into the guide 4. The spring-loaded buffer piston 51 and the guide 4 can form a first pressure adjustable cavity, through which the hydraulic oil can flow out through the first oil pressure regulating holes 41. As the springback buffer piston 51 moves toward the bottom of the guide 4, the number of first oil pressure regulating through holes 41 blocked by the springback buffer piston 51 increases, that is, the number of first oil pressure regulating through holes 41 for the hydraulic oil to flow out of the first pressure adjustable cavity decreases until all the first oil pressure regulating through holes 41 are blocked. During this process, the damping force on the springback buffer piston 51 in the first pressure adjustable cavity continuously increases.

[0082] As shown in Figure 5, in some embodiments, the compression hydraulic buffer assembly 6 further includes a hydraulic buffer sleeve 61, which is also a cylindrical structure with one end closed. The hydraulic buffer sleeve 61 is installed on the end of the oil reservoir 13 near the upper connecting seat 7, and the bottom of the hydraulic buffer sleeve 61 is located near the upper connecting seat 7.

[0083] As shown in Figure 5, in some embodiments, the side wall of the hydraulic buffer sleeve 61 is provided with a plurality of second oil pressure regulating through holes 611. When the piston valve system assembly 5 moves toward the hydraulic buffer sleeve 61, the compression buffer piston 54 can be inserted into the hydraulic buffer sleeve 61, and the hydraulic buffer sleeve 61 and the compression buffer piston 54 form a second pressure adjustable cavity. The hydraulic oil in the second pressure adjustable cavity can flow out through the second oil pressure regulating through holes 611. As the compression buffer piston 54 moves toward the bottom of the hydraulic buffer sleeve 61, the number of second oil pressure regulating through holes 611 blocked by the compression buffer piston 54 increases, that is, the number of second oil pressure regulating through holes 611 through which the hydraulic oil in the second pressure adjustable cavity flows out decreases until all the second oil pressure regulating through holes 611 are blocked. During this process, the damping force on the compression buffer piston 54 in the second pressure adjustable cavity continuously increases.

[0084] Referring to Figures 2 and 6, in some other embodiments, the nitrogen shock absorber 300 further includes an end hydraulic buffer damping adjustment structure 15. The end hydraulic buffer damping adjustment structure 15 includes a first buffer adjustment core, which is connected to the upper connecting seat 7. The first buffer adjustment core is partially located in the oil passage of the upper connecting seat 7. The hydraulic buffer sleeve 61 is provided with a third oil pressure adjustment through hole 612. The upper connecting seat 7 and the hydraulic buffer sleeve 61 form an adjustment cavity. The adjustment cavity is selectively connected to the third oil pressure adjustment through hole 612. The first buffer adjustment core can move relative to the upper connecting seat 7 to adjust the communication volume between the adjustment cavity and the third oil pressure adjustment through hole 612.

[0085] Specifically, the regulating cavity is used to accommodate hydraulic oil entering from the third oil pressure regulating through hole 612. The first buffer regulating core has an external thread, and the upper connecting seat 7 is threadedly connected to the first buffer regulating core. Thus, the first buffer regulating core can move axially relative to the upper connecting seat 7. Since part of the first buffer regulating core is located in the oil passage of the upper connecting seat 7, the part of the first buffer regulating core located in the oil passage can be adjusted relative to the oil passage, thereby adjusting the communication volume between the third oil pressure regulating through hole 612 and the regulating cavity.

[0086] It is understandable that the hydraulic buffer sleeve 61 is connected to the sealed cavity inside the hydraulic buffer sleeve 61 and the external oil reservoir 13 through the third oil pressure regulating through hole 612. The size of the regulating cavity is controlled by rotating the first buffer regulating core of the end hydraulic buffer damping regulating structure 15, thereby adjusting the size of the end compression hydraulic buffer damping force.

[0087] Specifically, when the piston valve system assembly 5 moves toward the hydraulic buffer sleeve 61, the compression buffer piston 54 can be inserted into the hydraulic buffer sleeve 61, and the hydraulic buffer sleeve 61 and the compression buffer piston 54 form a second pressure adjustable cavity. The hydraulic oil in the second pressure adjustable cavity can flow out of the hydraulic buffer sleeve 61 through the end hydraulic buffer damping adjustment structure 15. For example, the end hydraulic buffer damping adjustment structure 15 includes a first buffer adjustment core, which is partially located in the connecting channel. When the connecting channel is completely blocked by the first buffer adjustment core, the hydraulic oil will not flow out of the second pressure adjustable cavity. The first buffer adjustment core is connected to the connecting channel by a thread and can be rotated and adjusted, thereby changing the volume of the connecting channel and the flow rate of the second pressure adjustable cavity. This achieves the purpose of adjusting the damping force of the compression buffer piston 54 in the second pressure adjustable cavity. When the volume of the connecting channel gradually increases, the damping force of the compression buffer piston 54 in the second pressure adjustable cavity continuously decreases during this process. Conversely, when the volume of the connecting channel gradually decreases, the damping force of the compression buffer piston 54 in the second pressure adjustable cavity continuously increases during this process.

[0088] Of course, in some other embodiments, the compression hydraulic buffer assembly 6 also includes a hydraulic buffer sleeve 61. The hydraulic buffer sleeve 61 is also a cylindrical structure closed at one end. The hydraulic buffer sleeve 61 is installed at the end of the oil reservoir 13 near the upper connecting seat 7, and the bottom of the hydraulic buffer sleeve 61 is located near the upper connecting seat 7. The side wall of the hydraulic buffer sleeve 61 is provided with several second oil pressure regulating through holes 611. When the piston valve system assembly 5 moves toward the hydraulic buffer sleeve 61, the compression buffer piston 54 can be inserted into the hydraulic buffer sleeve 61. The hydraulic buffer sleeve 61 and the compression buffer piston 54 form a second pressure adjustable cavity. The hydraulic oil in the second pressure adjustable cavity can flow out through the second oil pressure regulating through holes 611. As the compression buffer piston 54 moves toward the bottom of the hydraulic buffer sleeve 61, the number of second oil pressure regulating through holes 611 blocked by the compression buffer piston 54 increases, that is, the number of second oil pressure regulating through holes 611 through which hydraulic oil flows out of the second pressure adjustable cavity decreases until all the second oil pressure regulating through holes 611 are blocked. During this process, the damping force on the compression buffer piston 54 in the second pressure adjustable cavity continuously increases.

[0089] The nitrogen shock absorber 300 also includes an end hydraulic buffer damping adjustment structure 15. The end hydraulic buffer damping adjustment structure 15 includes a first buffer adjustment core, which is connected to the upper connecting seat 7. The first buffer adjustment core is located in the oil passage of the upper connecting seat 7. The hydraulic buffer sleeve 61 is provided with a third oil pressure adjustment through hole 612. The upper connecting seat 7 and the hydraulic buffer sleeve 61 form an adjustment cavity. The adjustment cavity is selectively connected to the third oil pressure adjustment through hole 612. The first buffer adjustment core can move relative to the upper connecting seat 7 to adjust the communication volume between the adjustment cavity and the third oil pressure adjustment through hole 612.

[0090] For example, when the piston valve assembly 5 moves toward the hydraulic buffer sleeve 61, the compression buffer piston 54 can be inserted into the hydraulic buffer sleeve 61. The hydraulic buffer sleeve 61 and the compression buffer piston 54 form a second pressure adjustable cavity. The hydraulic oil in the second pressure adjustable cavity can flow out through the second oil pressure regulating through hole 611 and the third oil pressure regulating through hole 612. At this time, the damping force is minimal. As the compression buffer piston 54 moves toward the bottom of the hydraulic buffer sleeve 61, the number of second oil pressure regulating through holes 611 blocked by the compression buffer piston 54 increases, that is, the number of second oil pressure regulating through holes 611 through which the hydraulic oil flows out of the second pressure adjustable cavity decreases, while the hydraulic oil flowing out of the third oil pressure regulating through hole 612 remains unchanged, until all the second oil pressure regulating through holes 611 are blocked. During this process, the damping force on the compression buffer piston 54 in the second pressure adjustable cavity continuously increases. When the position of the first buffer adjustment core relative to the connecting channel is adjusted, the damping force on the compression buffer piston 54 in the second pressure adjustable cavity can be further adjusted. In this way, the second oil pressure adjustment through hole 611, the end hydraulic buffer damping adjustment structure 15 and the third oil pressure adjustment through hole 612 cooperate with each other, thereby increasing the adjustment range of the damping force on the compression buffer piston 54 in the second pressure adjustable cavity, making the adjustment range of the damping force on the compression buffer piston 54 in the second pressure adjustable cavity wider and improving the applicability.

[0091] In this embodiment, the inner center ring of the hydraulic buffer sleeve 61 has an internal thread, and the outer side of the hydraulic buffer rod 62 has an external thread. The inner center ring of the hydraulic buffer sleeve 61 is threadedly connected to the outer side of the hydraulic buffer rod 62. A clamping protrusion is provided on the outer wall of the hydraulic buffer sleeve 61. The clamping protrusion in Figure 5 is located below the hydraulic buffer sleeve 61 and is situated between the oil reservoir 13 and the upper connecting seat 7. The oil reservoir 13 and the upper connecting seat 7 are connected by threads. The outer wall of the oil reservoir 13 has an external thread, and the upper connecting seat 7 has a corresponding internal threaded hole. When the oil reservoir 13 and the upper connecting seat 7 are threadedly connected, the clamping protrusion can be clamped between the oil reservoir 13 and the upper connecting seat 7.

[0092] In this embodiment, the outer wall of the guide 4 is provided with a first guide groove, and the inner wall of the oil reservoir 13 is provided with a second guide groove. The first guide groove and the second guide groove are directly opposite each other, and a first retaining spring is engaged in the first guide groove and the second guide groove to fix the guide 4.

[0093] In this embodiment, as shown in Figure 3, the nitrogen damper 300 further includes a rebound adjustment assembly 2, which includes an adjusting wheel 21, a spherical pin 22, a push rod 23, a rebound conical core 24, and a fastening plug 25. The adjusting wheel 21 is threadedly connected to the lower connecting seat 1, which has a corresponding internal threaded hole. The adjusting wheel 21 has a conical portion with a diameter that gradually decreases from top to bottom. The push rod 23 is slidably connected to the piston center channel of the piston rod 3. One end of the push rod 23 is fixed with a spherical pin 22, and the end of the spherical pin 22 away from the push rod 23 abuts against the conical portion. The other end of the push rod 23 is connected to the rebound conical core 24. The fastening plug 25 is installed in the central fixing tube 14, and the center of the fastening plug 25 has a fastening center channel. The interior of the fixed tube 14 is connected, and the first oil passage hole 141 of the central tube is provided between the spring conical core 24 and the fastening plug 25. When hydraulic oil needs to flow from the first oil passage hole 141 of the central tube into the interior of the fixed tube 14 or from the interior of the fixed tube 14 into the first oil passage hole 141 of the central tube, the hydraulic oil must pass through the gap between the spring conical core 24 and the fastening plug 25. Therefore, by adjusting the position of the spring conical core 24, the size of the gap between the spring conical core 24 and the fastening plug 25 can be adjusted, thereby adjusting the damping force of the nitrogen shock absorber 300.

[0094] In actual use, by rotating the adjusting wheel 21, the adjusting wheel 21 can move up and down in the corresponding internal thread hole, so that the conical part can also move up and down. Since the contact surface between the spherical ejector pin 22 and the conical part is inclined, the conical part can push the spherical ejector pin 22, the ejector rod 23 and the spring-loaded conical core 24 to move left and right during the up and down movement, thereby adjusting the gap between the spring-loaded conical core 24 and the fastening plug 25, thereby adjusting the damping force of the nitrogen shock absorber 300.

[0095] In this embodiment, as shown in Figures 6, 8, and 29, the compression hydraulic buffer regulating valve system assembly 8 is installed in the corresponding groove (the groove being the first groove 72) of the upper connecting seat 7. The compression hydraulic buffer regulating valve system assembly 8 includes a buffer compression valve system 81, a second buffer regulating core 82, and a buffer threaded positioning seat 83. The buffer compression valve system 81 is fixed to the lower outer wall of the buffer threaded positioning seat 83. The buffer compression valve system 81 has a plurality of buffer compression valve piston through holes 811 in the circumferential direction, and a first valve plate 84 is connected to each buffer compression valve piston through hole 811. The external thread on the outer wall of the buffer threaded positioning seat 83 is used to connect with the corresponding groove (i.e., the first groove 72). The center of the buffer threaded positioning seat 83 is provided with a first adjusting core through hole 831. The upper end of the first adjusting core through hole 831 is also threadedly connected to a second buffer adjusting core 82. The side wall of the buffer threaded positioning seat 83 is provided with a first adjusting core oil passage hole 832. By turning the second buffer adjusting core 82, it can be moved up and down, thereby adjusting the opening size of the first adjusting core oil passage hole 832.

[0096] As shown in Figure 9, specifically, there are two first valve plates 84. The two first valve plates 84 are located at both ends of the piston through hole 811 of the buffer compression valve, and both first valve plates 84 partially block the opening of the piston through hole 811 of the buffer compression valve.

[0097] It is understandable that each buffer compression valve piston through hole 811 is provided with two first valve plates 84, that is, a first valve plate 84 is provided at each of the two openings of the buffer compression valve piston through hole 811, as shown in Figure 9. The first valve plate 84 is an annular valve plate, and an inclined oil leakage hole is provided at the upper left corner and the lower right corner of the buffer compression valve piston through hole 811.

[0098] When hydraulic oil flows from the compression chamber 200 to the hydraulic oil chamber in the nitrogen cylinder 11, part of the hydraulic oil enters the hydraulic oil chamber in the nitrogen cylinder 11 through the high and low speed regulating valve system assembly 9, and part of the hydraulic oil enters the first regulating core through hole 831 and the buffer compression valve piston through hole 811 of the compression hydraulic buffer regulating valve system assembly 8. After the hydraulic oil flows, it enters the recovery chamber 100 through the central channel of the hydraulic buffer rod 62, the second oil passage hole 142 of the central tube, and the first piston through hole 521.

[0099] After the first valve plate 84 is pushed open by the hydraulic oil, the hydraulic oil will flow through any opening of the piston through hole 811 of the buffer compression valve, thereby increasing the hydraulic oil flow rate and increasing the adjustment range of the damping force.

[0100] When the hydraulic oil passes through the piston through hole 811 of the buffer compression valve of the hydraulic buffer regulating valve system assembly 8, the hydraulic oil flows in from the small oil leakage hole in the upper left corner, pushes open the first valve plate 84 on the lower side, and flows into the restoration chamber 100.

[0101] When hydraulic oil flows from compression chamber 200 to recovery chamber 100, a portion of the hydraulic oil in compression chamber 200 enters recovery chamber 100 through the piston through-hole 811 of the buffer compression valve of compression hydraulic buffer regulating valve system assembly 8. When hydraulic oil flows from recovery chamber 100 to compression chamber 200, a portion of the hydraulic oil in recovery chamber 100 enters the central channel of hydraulic buffer rod 62 through rebound regulating assembly 2, and the hydraulic oil in the central channel of hydraulic buffer rod 62 enters compression chamber 200 through the piston through-hole 811 of the buffer compression valve of compression hydraulic buffer regulating valve system assembly 8.

[0102] When the piston rod 3 moves into the compression chamber 200 at a relatively fast speed, a large amount of hydraulic oil enters the compression chamber 200. At this time, the hydraulic oil will enter the compression hydraulic buffer regulating valve system assembly 8 through the first adjusting core through hole 831 and the first buffer compression valve piston through hole 811, and then flow into the groove where the compression high and low speed regulating valve system assembly 9 is located, and then into the nitrogen cylinder 11. When the piston rod 3 moves at a slower speed, the hydraulic oil enters the first adjusting core through hole 831, then enters the groove where the compression high and low speed regulating valve system assembly 9 is located, and then enters the nitrogen cylinder 11.

[0103] In this embodiment, as shown in FIG7, the high and low speed compression regulating valve system assembly 9 is installed in the corresponding groove (the groove being the second groove 71) of the upper connecting seat 7. The first groove 71 and the second groove 72 are connected through the connecting hole 73, thereby enabling hydraulic oil to enter the second groove from the high and low speed compression buffer regulating valve system assembly 8 and then enter the hydraulic oil chamber of the nitrogen cylinder 11. The high and low speed compression regulating valve system assembly 9 includes a high and low speed compression valve system 91, a spring 92, a low speed regulating core 93, a high and low speed regulating threaded positioning seat 94, and a high speed regulating wheel 95. The high and low speed compression valve system 91 is installed at the lower end of the high and low speed regulating threaded positioning seat 94, and the external thread on the outer wall of the high and low speed regulating threaded positioning seat 94 is used for threaded connection with the internal thread of the corresponding groove (i.e., the second groove). The high-low speed compression valve system 91 is provided with a high-low speed compression valve piston through hole 911, and a second valve plate 96 is connected to the high-low speed compression valve piston through hole 911. The outer wall of the high-speed adjusting wheel 95 is provided with an external thread, and the center through hole of the high-low speed adjusting thread positioning seat 94 is provided with an internal thread. The high-speed adjusting wheel 95 is threadedly installed at the center of the high-low speed adjusting thread positioning seat 94. A spring 92 is provided between the second valve plate 96 and the high-speed adjusting wheel 95. When the high-speed adjusting wheel 95 is turned, its up-and-down position can be adjusted, thereby adjusting the compression force on the spring 92, and further adjusting the pressure on the second valve plate 96. The center of the high-speed adjusting wheel 95 is provided with a second adjusting core through hole 951, and the upper end of the second adjusting core through hole 951 is also threadedly connected to a low-speed adjusting core 93. The side wall of the high-speed adjusting wheel 95 is provided with a second adjusting core oil passage hole 952. By turning the low-speed adjusting core 93, it can move up and down, thereby adjusting the opening size of the second adjusting core oil passage hole 952.

[0104] When the piston rod 3 compresses the recovery chamber 100 at a relatively fast speed, a large amount of hydraulic oil enters the compression chamber 200 from the nitrogen cylinder 11. At this time, the hydraulic oil will simultaneously enter the compression hydraulic buffer regulating valve system assembly 8 through the first adjusting core through hole 831 and the buffer compression valve piston through hole 811. When the piston rod 3 moves at a slower speed, a smaller amount of hydraulic oil enters the compression chamber 200 from the nitrogen cylinder 11. The hydraulic oil only enters the first adjusting core through hole 831 of the compression hydraulic buffer regulating valve system assembly 8, and then enters the compression chamber 200.

[0105] When the piston rod 3 compresses the compression chamber 200 at a relatively fast speed, the amount of hydraulic oil entering the nitrogen cylinder 11 from the compression chamber 200 increases. At this time, the hydraulic oil flows into the nitrogen cylinder 11 after passing through the piston through hole 911 of the high and low speed compression valve and the through hole 951 of the second adjusting core. When the piston rod 3 moves at a slower speed, the amount of hydraulic oil entering the nitrogen cylinder 11 from the compression chamber 200 per unit time is smaller, and the hydraulic oil enters the nitrogen cylinder 11 through the through hole 951 of the second adjusting core.

[0106] As shown in Figures 1 and 2, in this embodiment, a floating piston 10 is slidably connected inside the nitrogen cylinder 11. A sealing ring is provided on the outer wall of the floating piston 10 to enhance the sealing between the floating piston 10 and the nitrogen cylinder 11. The floating piston 10 divides the nitrogen cylinder 11 into a nitrogen chamber and a hydraulic oil chamber. The nitrogen chamber is filled with nitrogen, and the high and low speed regulating valve system assembly 9 can communicate with the hydraulic oil chamber.

[0107] In this embodiment, a nozzle cover 12 is provided at the end of the nitrogen cylinder 11 away from the high and low speed regulating valve system assembly 9, thereby sealing the nitrogen chamber. Furthermore, the nozzle cover 12 can be fixed by means of retaining rings, that is, a fixing groove is provided at the corresponding position of the nozzle cover 12 and the nitrogen cylinder 11, and the retaining ring is installed in the two fixing grooves to fix the nozzle cover 12.

[0108] Example 2

[0109] As shown in Figures 10-19, this embodiment provides a vibration reduction method for a nitrogen vibration damper, based on the nitrogen vibration damper 300 disclosed in Embodiment 1, and includes the following steps:

[0110] S1. As shown in Figure 10, when the nitrogen damper 300 is compressed from its initial state (i.e., the piston rod 3 moves to the right), part of the hydraulic oil in the compression chamber 200 passes through the second oil passage 142 of the central tube and the first piston through hole 521 on the main piston 52 and enters the recovery chamber 100. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly 9 to the hydraulic oil chamber in the nitrogen cylinder 11, pushing the floating piston 10 and compressing the nitrogen in the nitrogen chamber, increasing the nitrogen counterforce. Under this condition, the compression damping force of the nitrogen damper 300 is relatively small.

[0111] S2. As shown in Figure 11, when the nitrogen damper 300 is further compressed based on step S1, part of the hydraulic oil in the compression chamber 200 first passes through the second piston through-hole 531 on the buffer piston 53, and then through the first piston through-hole 521 on the main piston 52 to enter the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly 9 to the hydraulic oil chamber in the nitrogen cylinder 11. Because the hydraulic oil has an additional process of passing through the second piston through-hole 531 on the buffer piston 53 compared to step S1, the compression damping force of the nitrogen damper 300 is increased under this condition compared to the condition in S1.

[0112] S3. As shown in Figure 12, when the nitrogen shock absorber 300 is further compressed based on step S2, the hydraulic oil flow direction is the same as under condition S2. Part of the hydraulic oil in the compression chamber 200 first passes through the second piston through hole 531 on the buffer piston 53, and then through the first piston through hole 521 on the main piston 52 into the recovery chamber 100. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly 9 into the hydraulic oil chamber in the nitrogen cylinder 11. At the same time, the compression buffer piston 54 enters the hydraulic buffer sleeve 61. As the piston 54 moves toward the bottom of the hydraulic buffer sleeve 61, the number of second oil pressure regulating through holes 611 blocked by the compression buffer piston 54 increases, meaning the number of second oil pressure regulating through holes 611 through which hydraulic oil flows out of the second pressure adjustable cavity decreases until all the second oil pressure regulating through holes 611 are blocked. During this process, the damping force of the compression buffer piston 54 in the second pressure adjustable cavity continuously increases, thus causing the compression damping force of the nitrogen shock absorber 300 under this condition to continue to increase compared to the S2 condition.

[0113] S4. As shown in Figure 13, when the nitrogen damper 300 is further compressed based on step S3 and reaches its limit compression stroke, the hydraulic oil flow direction is the same as in condition S3. Part of the hydraulic oil in the compression chamber 200 first passes through the second piston through-hole 531 on the buffer piston 53, then through the first piston through-hole 521 on the main piston 52 and enters the recovery chamber 100. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly 9 to the hydraulic oil chamber in the nitrogen cylinder 11. At the same time, the hydraulic buffer rod 62 enters the center of the central fixed tube 14, thus forming a new hydraulic chamber. At this time, the hydraulic oil in the hydraulic buffer rod 62 enters the compression high and low speed regulating valve system assembly 9 through the compression hydraulic buffer regulating valve system assembly 8, and finally flows to the hydraulic oil chamber in the nitrogen cylinder 11. Under this condition, the compression damping force of the nitrogen damper 300 is further increased compared to the condition in S3.

[0114] This structure improves the performance of the compression hydraulic buffer system and increases the hydraulic buffer stroke. From steps S1 to S4, the compression damping force of the nitrogen damper 300 gradually increases, thereby realizing progressive damping hydraulic buffer.

[0115] S5. As shown in Figure 14, when the nitrogen shock absorber 300 is in its ultimate compression stroke and recovering (i.e., the piston rod 3 moves to the left), a portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 sequentially through the first piston through-hole 521 of the main piston 52 and the second piston through-hole 531 of the buffer piston 53. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 sequentially through the first oil passage 141 of the central tube, the second oil passage 142 of the central tube, and the second piston through-hole 531 of the buffer piston 53. Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber through the compression high / low speed regulating valve assembly 9 to the compression chamber 200. Under this condition, the recovery damping force of the nitrogen shock absorber 300 is relatively large.

[0116] S6. As shown in Figure 15, when the nitrogen damper 300 further recovers based on step S5, a portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first piston through-hole 521 of the main piston 52, the second oil passage 142 of the central tube, and the central channel of the central fixed tube 14. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first oil passage 141 of the central tube and the central channel of the central fixed tube 14. The hydraulic oil flow direction in the hydraulic oil chamber of the nitrogen cylinder 11 is consistent with S5. Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber through the compression high and low speed regulating valve system assembly 9 to the compression chamber 200. Under this condition, the recovery damping force of the nitrogen damper 300 is reduced compared to the condition in S5, thereby achieving rapid reset of the piston rod 3.

[0117] S7. As shown in Figure 16, when the nitrogen shock absorber 300 further recovers based on step S6, at the limit recovery stroke, the hydraulic oil flow direction of the recovery chamber 100 is consistent with that under the working condition of step S6. A portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first piston through hole 521 of the main piston 52, the second oil passage hole 142 of the central tube, and the central channel of the central fixed tube 14. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first oil passage hole 141 of the central tube and the central channel of the central fixed tube 14. The hydraulic oil flow direction in the hydraulic oil chamber of the nitrogen cylinder 11 is consistent with that in step S6. Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber through the compression high and low speed regulating valve system assembly 9 to the compression chamber 200. Simultaneously, the rebound buffer piston 51 enters the guide 4. As the rebound buffer piston 51 moves towards the bottom of the guide 4, the number of first oil pressure regulating through holes 41 blocked by the rebound buffer piston 51 increases, meaning the number of first oil pressure regulating through holes 41 supplying hydraulic oil to the first pressure adjustable cavity decreases until all first oil pressure regulating through holes 41 are blocked. During this process, the damping force on the rebound buffer piston 51 in the first pressure adjustable cavity continuously increases. Under this condition, the restoring damping force of the nitrogen shock absorber 300 is greater than that under the condition in step S6. This structure can establish a large rebound buffer force value in a short stroke, replacing the traditional hard impact buffer with a hydraulic buffer system, absorbing impact energy, and reducing chassis acceleration at the end of the rebound, thereby improving driver comfort.

[0118] Furthermore, as shown in Figure 17, the working principle of the high and low speed regulating valve system assembly 9 is as follows:

[0119] During the compression process of the nitrogen shock absorber 300, the hydraulic oil in the compression chamber 200 will enter the hydraulic oil chamber in the nitrogen cylinder 11 through the high and low speed regulating valve system assembly 9. The amount of oil in this part is equal to the volume of the piston rod 3 entering the oil reservoir 13.

[0120] When hydraulic oil enters the high / low speed regulating valve system assembly 9, it flows in two separate paths. A portion of the hydraulic oil enters through the central through-hole of the high / low speed regulating threaded positioning seat 94. By rotating the low-speed regulating core 93, it misaligns with the oil passage of the second regulating core's through-hole, changing the area through which the hydraulic oil passes and thus altering the flow rate, thereby changing the compression damping force. Because the hydraulic oil at lower pressure passes through at this time, it affects the compression damping force of the nitrogen shock absorber 300 in the low-speed stage. The shock absorber's movement speed is considered low speed below 0.3 m / s, medium speed between 0.3 m / s and 1.0 m / s, and high speed above 1.0 m / s. When the nitrogen shock absorber 300 operates at a high speed, the oil passage of the second adjusting core is insufficient to meet the hydraulic oil flow rate. At this time, the hydraulic oil pressure is high, and hydraulic oil flows in from the piston passage 911 of the high and low speed compression valve system 91, forcing the second valve plate to open. This allows the two hydraulic oil paths to merge and flow together into the hydraulic oil chamber of the nitrogen cylinder 11. By rotating the high-speed adjusting wheel 95, the spring 92 is compressed, applying a preload to the second valve plate, changing the hydraulic oil flow rate, and affecting the damping force of the shock absorber during high-speed operation.

[0121] As shown in Figure 18, the working principle of the compression hydraulic buffer regulating valve system component 8 is as follows:

[0122] During the compression process of the nitrogen shock absorber 300, when it reaches its limit compression stroke, the hydraulic buffer rod 62 enters the central fixed pipe 14, forming a hydraulic cavity and establishing compression damping force. The hydraulic oil in the hydraulic cavity can enter the compression hydraulic buffer regulating valve system assembly 8 through the through hole in the hydraulic buffer rod 62, then pass through the compression high and low speed regulating valve system assembly 9, and finally enter the hydraulic oil cavity in the nitrogen cylinder 11.

[0123] When hydraulic oil enters the compression hydraulic buffer regulating valve system assembly 8, it flows in two separate streams. One portion enters through the central through-hole of the buffer threaded positioning seat 83 and flows out through the through-hole of the first regulating core. The other portion flows in through the buffer compression valve piston through-hole 811 of the buffer compression valve system 81, forcing the first valve plate to open. The two streams of hydraulic oil merge and, after passing through the compression high / low speed regulating valve system assembly 9, finally enter the hydraulic oil chamber within the nitrogen cylinder 11. By rotating the second buffer regulating core 82, misaligning it with the oil through-hole of the first regulating core, the area through which the hydraulic oil passes is changed, thus controlling the flow rate of the hydraulic buffer pressure oil to adjust the magnitude of the hydraulic buffer damping force.

[0124] As shown in Figure 19, the working principle of the springback adjustment component 2 is as follows:

[0125] During the recovery process of the nitrogen shock absorber 300, part of the hydraulic oil in the recovery chamber flows into the compression chamber 200 through the first piston through hole 521 of the main piston 52 and the second piston through hole 531 of the buffer piston 53. When the hydraulic oil passes through, it will generate a recovery damping force. The other part of the hydraulic oil enters the compression chamber 200 through the first oil passage hole 141 of the central tube and the central channel of the central fixed tube 14.

[0126] When hydraulic oil enters the rebound adjustment assembly 2, the hydraulic oil in the recovery chamber flows in through the first oil passage 141 of the central tube, flows out through the gap between the rebound conical core 24 and the fastening plug 25, and flows into the compression chamber 200. By rotating the adjusting wheel 21, the spherical ejector pin 22 moves back and forth, thereby pushing the ejector rod 23 to move back and forth. Changing the gap between the rebound conical core 24 and the fastening plug 25 changes the area through which the hydraulic oil passes, changes the flow rate of the hydraulic oil, and thus changes the recovery damping force.

[0127] Example 3

[0128] As shown in Figures 20-30, this embodiment provides a vibration reduction method for a nitrogen vibration damper, based on the nitrogen vibration damper 300 disclosed in Embodiment 1, and includes the following steps:

[0129] S1. As shown in Figure 20, when the nitrogen shock absorber 300 is compressed from the initial state, part of the hydraulic oil in the compression chamber 200 passes through the central channel of the central fixed pipe 14, the second oil passage hole 142 of the central pipe, and the first piston through hole 521 on the main piston 52 and enters the recovery chamber 100. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly 9 to the hydraulic oil chamber in the nitrogen cylinder 11, pushing the floating piston 10 to compress the nitrogen in the nitrogen chamber of the nitrogen cylinder 11, and increasing the nitrogen counterforce.

[0130] The magnitude of the compression damping force is adjusted by regulating the flow rate of hydraulic oil inside the high and low speed regulating valve system 9; under this S1 condition, the compression damping force of the nitrogen shock absorber 300 is relatively small.

[0131] S2. As shown in Figure 21, when the nitrogen shock absorber 300 is further compressed, the hydraulic buffer rod 62 enters the central channel of the central fixed tube 14. Part of the hydraulic oil in the compression chamber 200 first passes through the second piston through hole 531 on the buffer piston 53, and then passes through the first piston through hole 521 on the main piston 52 to enter the recovery chamber 100. Part of the hydraulic oil passes through the compression hydraulic buffer regulating valve system assembly 8, the central channel of the hydraulic buffer rod 62, the second oil passage hole 142 of the central tube, and the first piston through hole 521 to enter the recovery chamber. Another part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly 9 to the hydraulic oil chamber in the nitrogen cylinder 11. The magnitude of the compression hydraulic buffer damping force is adjusted by adjusting the hydraulic oil flow rate inside the compression hydraulic buffer regulating valve system assembly 8.

[0132] Under this S2 condition, the compression damping force of the nitrogen shock absorber 300 is increased compared to that under the S1 condition.

[0133] S3. As shown in Figure 22, when the nitrogen shock absorber 300 is further compressed, the hydraulic buffer rod 62 enters the central channel of the central fixed tube 14. Part of the hydraulic oil in the compression chamber 200 first passes through the second piston through hole 531 on the buffer piston 53, and then through the first piston through hole 521 on the main piston 52 to enter the recovery chamber 100. Part of the hydraulic oil passes through the compression hydraulic buffer regulating valve system assembly 8, the central channel of the hydraulic buffer rod 62, the second oil passage hole 142 of the central tube, and the first piston through hole 521 to enter the recovery chamber 100. The other part of the hydraulic oil... The compressed oil flows through the high and low speed regulating valve system 9 to the hydraulic oil chamber in the nitrogen cylinder 11. At the same time, the compression buffer piston 54 enters the compression hydraulic buffer assembly 6, and the compression buffer piston 54 and the compression hydraulic buffer assembly 6 form a closed cavity. The adjustment of the end hydraulic buffer damping adjustment structure 15 connects the adjustment cavity, the third oil pressure regulating through hole 612, the closed cavity and the external oil reservoir 13. The magnitude of the end compression hydraulic buffer damping force is adjusted by controlling the flow rate of the adjustment cavity by rotating the first buffer adjustment core in the end hydraulic buffer damping adjustment structure 15.

[0134] The end hydraulic buffer damping adjustment structure 15 can control the flow rate of the adjustment chamber to adjust the magnitude of the end compression hydraulic buffer damping force.

[0135] S4. As shown in Figures 23 and 24, when the nitrogen shock absorber 300 is further compressed, at the limit compression stroke, the hydraulic oil in the compression chamber 200 enters the recovery chamber through the second piston through hole 531 and the first piston through hole 521. At the same time, the hydraulic buffer rod 62 enters the central channel of the central fixed tube 14 and covers the second oil passage 142 of the central tube of the central fixed tube 14, forming another sealed cavity. The other part of the hydraulic oil passes through the compression high and low speed regulating valve system assembly 9 and finally flows to the hydraulic oil chamber in the nitrogen cylinder 11. Under this S4 condition, the compression damping force of the nitrogen shock absorber 300 is further increased compared to the S3 condition.

[0136] This step not only increases the hydraulic buffer stroke but also adds a multi-stage adjustable structure, improving the performance of the compression hydraulic buffer system. It also adds segmented adjustment of the compression damping force, realizing progressive damping hydraulic buffering to meet the vibration reduction requirements of different vehicle speeds.

[0137] S5. As shown in Figure 25, when the nitrogen shock absorber 300 is at its limit compression stroke and begins to recover, the hydraulic buffer rod 62 covers the second oil passage 142 of the central tube of the central fixed tube 14. A portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first piston through hole 521 and the second piston through hole 531 in sequence. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first oil passage 141 of the central tube, the rebound adjustment assembly 2, the central channel of the hydraulic buffer rod 62, and the compression hydraulic buffer adjustment valve system assembly 8 in sequence. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber through the compression high and low speed adjustment valve system assembly 9 to the compression chamber 200. Under this S5 condition, the recovery damping force of the nitrogen shock absorber 300 is relatively large.

[0138] S6. As shown in Figure 26, when the nitrogen shock absorber 300 further recovers, the hydraulic buffer rod 62 does not cover the second oil passage 142 of the central tube of the central fixed tube 14. Part of the hydraulic oil in the recovery chamber 100 enters the central channel of the hydraulic buffer rod 62 through the first piston through hole 521 and the second oil passage 142 of the central tube. The other part of the hydraulic oil in the recovery chamber 100 enters the central channel of the hydraulic buffer rod 62 through the first oil passage 141 of the central tube and the rebound adjustment assembly 2. The hydraulic oil in the central channel of the hydraulic buffer rod 62 enters the compression chamber 200 through the compression hydraulic buffer adjustment valve system assembly 8. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber to the compression chamber 200 through the compression high and low speed adjustment valve system assembly 9. Under this S6 condition, the recovery damping force of the nitrogen shock absorber 300 is reduced compared to the S5 condition.

[0139] S7. As shown in Figure 27, when the nitrogen shock absorber 300 further recovers, the hydraulic buffer rod 62 leaves the central fixed tube 14. A portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first piston through hole 521 and the second oil passage hole 142 of the central tube. Another portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first oil passage hole 141 of the central tube and the rebound adjustment assembly 2. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder 11 flows from the hydraulic oil chamber in the nitrogen cylinder through the compression high and low speed adjustment valve system assembly 9 to the compression chamber 200. Under this S7 condition, the recovery damping force of the nitrogen shock absorber 300 is reduced compared to the S6 condition.

[0140] S8. As shown in Figure 28, when the nitrogen shock absorber 300 further recovers, at the limit recovery stroke, a portion of the hydraulic oil in the recovery chamber 100 enters the compression chamber 200 through the first piston through-hole 521 and the second oil passage 142 of the central tube. Another portion of the hydraulic oil in the recovery chamber enters the compression chamber 200 through the first oil passage 141 of the central tube and the rebound adjustment assembly 2. Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber of the nitrogen cylinder 11 flows from the hydraulic oil chamber in the nitrogen cylinder 11 through the high and low speed compression valve piston through-hole 911 of the high and low speed adjustment valve system assembly 9 to the compression chamber 200. At the same time, the rebound buffer piston 51 enters the guide, forming a sealed cavity. The magnitude of the compression hydraulic buffer damping force is controlled by controlling the distance and size of the first oil pressure adjustment through-hole 41 of the guide 4. End compression hydraulic buffer. Under this S8 condition, the recovery damping force of the nitrogen shock absorber 300 increases sharply compared to the S7 condition.

[0141] This structure enables the recovery damping force to decrease step by step during the shock absorber's recovery motion, achieving rapid piston rod reset. At the same time, under extreme conditions, it can establish a large rebound buffer force value in a short stroke, replacing the traditional hard impact buffer with a hydraulic buffer system to absorb impact energy and reduce chassis acceleration at the end of the rebound.

[0142] As shown in Figure 30, the working principle of the compression hydraulic buffer regulating valve system component 8 is as follows:

[0143] During the compression process of the nitrogen shock absorber 300, the hydraulic buffer rod 62 of the compression hydraulic buffer assembly 6 enters the central channel of the central fixed tube 14, and the hydraulic oil in the compression chamber 200 passes through the compression hydraulic buffer regulating valve system assembly 8, the central channel of the hydraulic buffer rod 62, the first oil passage hole 141 of the central tube, and the first piston through hole 521 in sequence before entering the recovery chamber 100.

[0144] When hydraulic oil enters the compression hydraulic buffer regulating valve system assembly 8, it flows in two separate paths. One portion enters through the flow hole on the side wall of the threaded positioning seat 83 and flows out through the gap between the second buffer regulating core 82 and the first regulating core through hole 831. The other portion flows in through the built-in buffer compression valve piston through hole 811 of the buffer compression valve system 81, forcing the first valve plate of the compression chamber 200 to open. The two hydraulic oil paths merge and flow through the central channel of the hydraulic buffer rod 62, the first oil passage hole 141 of the central tube, and the first piston through hole 521 of the main piston, finally entering the recovery chamber. By rotating the second buffer regulating core 82, causing it to misalign with the first regulating core through hole 831, the area through which the hydraulic oil passes is changed. By controlling the flow rate of the hydraulic buffer hydraulic oil, the magnitude of the compression hydraulic buffer damping force is adjusted.

[0145] As shown in Figure 29, the working principle of the high and low speed regulating valve system assembly 9 is as follows:

[0146] During the compression process of the nitrogen shock absorber 300, the hydraulic oil in the compression chamber 200 will enter the hydraulic oil chamber in the nitrogen cylinder through the high and low speed regulating valve system assembly 9. The amount of oil in this part is equal to the volume of the piston rod 3 entering the oil reservoir 13.

[0147] When hydraulic oil enters the high / low speed regulating valve system assembly 9, it flows in two separate paths. A portion of the hydraulic oil enters through the central channel of the hydraulic buffer rod 62. By rotating the low-speed regulating core 93, the low-speed regulating core 93 is misaligned with the central channel of the high / low speed regulating valve system assembly 9, changing the area through which the hydraulic oil passes and thus altering the flow rate, thereby changing the compression damping force. Because the hydraulic oil at lower pressure passes through at this time, it affects the compression damping force of the nitrogen shock absorber 300 at low speeds. When the nitrogen shock absorber 300 operates at higher speeds, the low-speed hydraulic oil channel is insufficient to accommodate the flow of hydraulic oil. At this time, the hydraulic oil pressure is higher, and the hydraulic oil flows in through the piston through-hole 911 of the high / low speed compression valve system 91, forcing the second valve plate 96 of the compression chamber 200 to open, thus flowing into the hydraulic oil chamber of the nitrogen cylinder. By rotating the high-speed adjusting wheel 95, the spring 92 is compressed, and a preload is applied to the second valve plate 96 of the compression chamber 200, thereby changing the flow rate of the hydraulic oil and affecting the damping force of the shock absorber during the high-speed phase.

[0148] For example, the upper connecting seat 7 is provided with a first groove 72 and a second groove 71. The second groove 72 is provided with a compression high and low speed regulating valve system assembly 9, and the first groove 72 is provided with a compression hydraulic buffer regulating valve system assembly 8. The first groove 72 and the second groove 71 are connected through a connecting channel. In addition, the second groove is connected to the compression chamber 200, while the first groove 72 is connected to the hydraulic buffer rod 62. When hydraulic oil enters the compression high and low speed regulating valve system assembly 9 from the second groove 71, it will also enter the first groove 72 through the connecting channel and pass through the compression hydraulic buffer regulating valve system assembly 8.

[0149] As shown in Figure 19, the working principle of the springback adjustment component 2 is as follows:

[0150] During the recovery process of the nitrogen shock absorber 300, a portion of the hydraulic oil in the recovery chamber 100 passes through the rebound adjustment assembly 2 and enters the central channel of the central fixed tube 14, ultimately entering the compression chamber 200. When the hydraulic oil enters the rebound adjustment assembly 2, rotating the adjustment wheel 21 causes the spherical ejector pin 22 to move back and forth, thereby pushing the ejector rod 23, the rebound cone core 24, and the fastening plug 25 to move back and forth. Changing the gap between the rebound cone core 24 and the fastening plug 25 alters the area through which the hydraulic oil passes, changing the flow rate of the hydraulic oil and thus changing the recovery damping force.

[0151] Because the viscosity of the damper oil decreases at high temperatures, the force of the nitrogen damper 300 decreases. At this point, by injecting liquid into the sealed area between the push rod 23 and the spring-loaded conical core 24, based on the principle of high-temperature expansion, the spring-loaded conical core 24 will be slightly pushed forward, reducing the gap between the spring-loaded conical core 24 and the fastening plug 25, increasing the restoring damping force, and mitigating the adverse effects of the force decrease in the nitrogen damper 300 at high temperatures.

[0152] As shown in Figure 31, at the same speed, during the compression motion of the shock absorber, the damping force exhibits a segmented increase as the compression gradually increases. Under condition S1, the damping force curve presents a smooth straight line. Under condition S2, the damping force curve becomes a smooth curve after the increase in displacement. Under condition S3, the damping force curve shows a continuous increasing trend. Under condition S4, the damping force curve continues to show a continuous increasing trend.

[0153] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A nitrogen vibration damper, characterized in that, include: Oil reservoir (13), the oil reservoir (13) is filled with hydraulic oil; Piston rod (3), the piston rod (3) is slidably connected to the oil reservoir (13), one end of the piston rod (3) is located inside the oil reservoir (13), and the other end of the piston rod (3) is located outside the oil reservoir (13); The lower connecting seat (1) is fixed to one end of the piston rod (3) located outside the oil reservoir (13); An upper connecting seat (7) is installed at one end of the oil reservoir (13) away from the lower connecting seat (1). The upper connecting seat (7) is equipped with a compression hydraulic buffer regulating valve system assembly (8), a compression high and low speed regulating valve system assembly (9), and a nitrogen cylinder (11). The compression hydraulic buffer regulating valve system assembly (8) is connected to the compression high and low speed regulating valve system assembly (9), the compression high and low speed regulating valve system assembly (9) is connected to the nitrogen cylinder (11), and the compression high and low speed regulating valve system assembly (9) is also connected to the interior of the oil reservoir (13). A central fixed tube (14) is fixed to one end of the piston rod (3) located inside the oil reservoir (13). The central fixed tube (14) has several central tube first oil passage holes (141) on the side wall of the end of the central fixed tube (14) near the piston rod (3). Piston valve system assembly (5), the piston valve system assembly (5) is fixed on the outer wall of the central fixed tube (14), the piston valve system assembly (5) divides the oil reservoir (13) into a recovery chamber and a compression chamber, the side of the piston valve system assembly (5) near the lower connecting seat (1) is the recovery chamber, the side of the piston valve system assembly (5) near the upper connecting seat (7) is the compression chamber, the piston valve system assembly (5) includes a main piston (52) and a buffer piston (53), the main piston (52) is provided with a plurality of first piston through holes (521), the buffer piston (53) is provided with a plurality of second piston through holes (531), the side wall of the central fixed tube (14) is also circumferentially distributed with a plurality of central tube second oil passage holes (142), the central tube second oil passage holes (142) are located between the main piston (52) and the buffer piston (53); And a compression hydraulic buffer assembly (6), the compression hydraulic buffer assembly (6) includes a hydraulic buffer rod (62), the hydraulic buffer rod (62) is disposed in the compression chamber, and the hydraulic buffer rod (62) is connected to the compression hydraulic buffer regulating valve system assembly (8).

2. The nitrogen vibration damper according to claim 1, characterized in that: The piston valve system assembly (5) further includes a springback buffer piston (51) and a compression buffer piston (54), wherein the springback buffer piston (51) is located on the side of the main piston (52) away from the buffer piston (53), and the compression buffer piston (54) is located on the side of the buffer piston (53) away from the main piston (52); The oil reservoir (13) is equipped with a guide (4) at one end near the lower connecting seat (1). The guide (4) has several first oil pressure regulating through holes (41) on its side wall. When the piston valve system assembly (5) moves toward the guide (4), the rebound buffer piston (51) can be inserted into the guide (4). The compression hydraulic buffer assembly (6) also includes a hydraulic buffer sleeve (61), which is installed at one end of the oil reservoir (13) near the upper connecting seat (7). When the piston valve system assembly (5) moves toward the hydraulic buffer sleeve (61), the compression buffer piston (54) can be inserted into the hydraulic buffer sleeve (61).

3. The nitrogen vibration damper according to claim 2, characterized in that: The hydraulic buffer sleeve (61) has several second oil pressure regulating through holes (611) on its side wall.

4. The nitrogen vibration damper according to claim 2 or 3, characterized in that: The nitrogen shock absorber also includes an end hydraulic buffer damping adjustment structure (15), which includes a first buffer adjustment core connected to the upper connecting seat (7). The first buffer adjustment core is partially located in the oil passage of the upper connecting seat (7). The hydraulic buffer sleeve (61) is provided with a third oil pressure adjustment through hole (612). The upper connecting seat (7) and the hydraulic buffer sleeve (61) form an adjustment cavity. The adjustment cavity is selectively connected to the third oil pressure adjustment through hole (612). The first buffer adjustment core can move relative to the upper connecting seat (7) to adjust the communication volume between the adjustment cavity and the third oil pressure adjustment through hole (612).

5. The nitrogen vibration damper according to claim 2 or 3, characterized in that: The hydraulic buffer sleeve (61) is threaded to the outside of the hydraulic buffer rod (62). The outer wall of the hydraulic buffer sleeve (61) is provided with a clamping protrusion. The oil reservoir (13) is threaded to the upper connecting seat (7). The oil reservoir (13) and the upper connecting seat (7) can clamp the clamping protrusion.

6. The nitrogen vibration damper according to claim 2 or 3, characterized in that: The guide (4) has a first guide groove on its outer wall and the oil reservoir (13) has a second guide groove on its inner wall. The first guide groove and the second guide groove are directly opposite each other and a first snap ring is engaged in the first guide groove and the second guide groove.

7. The nitrogen vibration damper according to any one of claims 1-3, characterized in that: It also includes a springback adjustment assembly (2), which includes an adjustment wheel (21), a spherical ejector pin (22), a push rod (23), a springback conical core (24), and a fastening plug (25). The adjustment wheel (21) is threaded to the lower connecting seat (1). The adjustment wheel (21) has a conical part. The push rod (23) is slidably connected to the piston center channel of the piston rod (3). One end of the push rod (23) is fixed with the spherical ejector pin (22). The end of the spherical ejector pin (22) away from the push rod (23) abuts against the conical part. The other end of the push rod (23) is connected to the springback conical core (24). The fastening plug (25) is installed in the central fixing tube (14). The first oil passage hole (141) of the central tube is provided between the springback conical core (24) and the fastening plug (25).

8. The nitrogen vibration damper according to any one of claims 1-3, characterized in that: The compression hydraulic buffer regulating valve system assembly (8) includes a buffer compression valve system (81), a second buffer regulating core (82), and a buffer threaded positioning seat (83). The buffer compression valve system (81) is fixed on the lower outer wall of the buffer threaded positioning seat (83). The buffer compression valve system (81) is provided with a buffer compression valve piston through hole (811). A first valve plate (84) is connected to the buffer compression valve piston through hole (811). The center of the buffer threaded positioning seat (83) is provided with a first regulating core through hole (831). The upper end of the first regulating core through hole (831) is also threadedly connected to the second buffer regulating core (82). The side wall of the buffer threaded positioning seat (83) is provided with a first regulating core oil passage hole (832).

9. The nitrogen vibration damper according to claim 8, characterized in that: There are two first valve plates (84), which are located at both ends of the piston through hole (811) of the buffer compression valve. Both first valve plates (84) partially block the opening of the piston through hole (811) of the buffer compression valve.

10. The nitrogen vibration damper according to any one of claims 1-3, characterized in that: The high and low speed compression regulating valve system assembly (9) includes a high and low speed compression valve system (91), a spring (92), a low speed regulating core (93), a high and low speed regulating threaded positioning seat (94), and a high speed regulating wheel (95). The high and low speed compression valve system (91) is installed at the lower end of the high and low speed regulating threaded positioning seat (94). The high and low speed compression valve system (91) is provided with a high and low speed compression valve piston through hole (911), and a second valve plate (95) is connected to the high and low speed compression valve piston through hole (911). 6) The high-speed adjusting wheel (95) is installed at the center of the high and low speed adjusting threaded positioning seat (94). The spring (92) is provided between the second valve plate (96) and the high-speed adjusting wheel (95). The center of the high-speed adjusting wheel (95) is provided with a second adjusting core through hole (951). The upper end of the second adjusting core through hole (951) is threaded to the low speed adjusting core (93). The side wall of the high-speed adjusting wheel (95) is provided with a second adjusting core oil passage hole (952).

11. The nitrogen vibration damper according to any one of claims 1-3, characterized in that: A floating piston (10) is slidably connected inside the nitrogen cylinder (11). The floating piston (10) divides the inside of the nitrogen cylinder (11) into a nitrogen chamber and a hydraulic oil chamber, and the nitrogen chamber is filled with nitrogen.

12. The nitrogen vibration damper according to any one of claims 1-3, characterized in that: The nitrogen cylinder (11) has a nozzle cap (12) at the end away from the compression high and low speed regulating valve system assembly (9).

13. A vibration reduction method for a nitrogen vibration damper, characterized in that, The nitrogen vibration damper applied to any one of claims 1-12 comprises the following steps: S1. When the nitrogen shock absorber is compressed from the initial state, part of the hydraulic oil in the compression chamber (200) passes through the second oil passage (142) of the central tube and the first piston through hole (521) on the main piston (52) and enters the recovery chamber (100). The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly (9) to the hydraulic oil chamber in the nitrogen cylinder (11), pushing the floating piston (10) to compress the nitrogen in the nitrogen chamber, and the nitrogen counterforce increases. S2. When the nitrogen shock absorber is further compressed, part of the hydraulic oil in the compression chamber (200) first passes through the second piston through hole (531) on the buffer piston (53), and then passes through the first piston through hole (521) on the main piston (52) to enter the recovery chamber (100). The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly (9) to the hydraulic oil chamber in the nitrogen cylinder (11). S3. When the nitrogen shock absorber is further compressed, part of the hydraulic oil in the compression chamber (200) first passes through the second piston through hole (531) on the buffer piston (53), and then passes through the first piston through hole (521) on the main piston (52) to enter the recovery chamber (100). The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly (9) to the hydraulic oil chamber in the nitrogen cylinder (11). At the same time, the compression buffer piston (54) enters the hydraulic buffer sleeve (61). S4. When the nitrogen shock absorber is further compressed and reaches the limit compression stroke, part of the hydraulic oil in the compression chamber (200) first passes through the second piston through hole (531) on the buffer piston (53), and then passes through the first piston through hole (521) on the main piston (52) to enter the recovery chamber (100). The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly (9) to the hydraulic oil chamber in the nitrogen cylinder (11). At the same time, the hydraulic buffer rod (62) enters the center of the central fixed tube (14). At this time, the hydraulic oil in the hydraulic buffer rod (62) enters the compression high and low speed regulating valve system assembly (9) through the compression hydraulic buffer regulating valve system assembly (8), and finally flows to the hydraulic oil chamber in the nitrogen cylinder (11). S5. When the nitrogen shock absorber is in the limit compression stroke for recovery, a part of the hydraulic oil in the recovery chamber (100) enters the compression chamber (200) through the first piston through hole (521) of the main piston (52) and the second piston through hole (531) of the buffer piston (53) in sequence. Another part of the hydraulic oil in the recovery chamber (100) enters the compression chamber (200) through the first oil passage hole (141) of the central tube, the second oil passage hole (142) of the central tube and the second piston through hole (531) of the buffer piston (53) in sequence. Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber to the compression chamber (200) through the compression high and low speed regulating valve system assembly (9). S6. When the nitrogen shock absorber is further restored, a part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first piston through hole (521) of the main piston (52), the second oil passage hole (142) of the central tube and the central channel of the central fixed tube (14). Another part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first oil passage hole (141) of the central tube and the central channel of the central fixed tube (14). Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber to the compression chamber (200) through the compression high and low speed regulating valve system assembly (9). S7. When the nitrogen shock absorber is further restored, at the limit of the restoration stroke, a part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first piston through hole (521) of the main piston (52), the second oil passage hole (142) of the central tube and the central channel of the central fixed tube (14). Another part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first oil passage hole (141) of the central tube and the central channel of the central fixed tube (14). Under the action of the nitrogen counterforce, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber to the compression chamber (200) through the compression high and low speed regulating valve system assembly (9); at the same time, the rebound buffer piston (51) enters the guide (4).

14. A vibration reduction method for a nitrogen vibration damper, characterized in that, The nitrogen vibration damper applied to any one of claims 4-12 comprises the following steps: S1. When the nitrogen shock absorber is compressed from the initial state, part of the hydraulic oil in the compression chamber (200) passes through the central channel of the central fixed pipe (14), the second oil passage hole (142) of the central pipe and the first piston through hole (521) on the main piston (52) and enters the recovery chamber (100). The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly (9) to the hydraulic oil chamber in the nitrogen cylinder (11), pushing the floating piston (10) to compress the nitrogen in the nitrogen chamber of the nitrogen cylinder (11) and increasing the nitrogen counterforce. S2. When the nitrogen shock absorber is further compressed, the hydraulic buffer rod (62) enters the central channel of the central fixed tube (14). Part of the hydraulic oil in the compression chamber (200) first passes through the second piston through hole (531) on the buffer piston (53), and then passes through the first piston through hole (521) on the main piston (52) to enter the recovery chamber (100). Part of the hydraulic oil passes through the compression hydraulic buffer regulating valve system assembly (8), the central channel of the hydraulic buffer rod (62), the second oil passage hole (142) of the central tube, and the first piston through hole (521) to enter the recovery chamber. The other part of the hydraulic oil flows through the compression high and low speed regulating valve system assembly (9) to the hydraulic oil chamber in the nitrogen cylinder (11). S3. When the nitrogen shock absorber is further compressed, the hydraulic buffer rod (62) enters the central channel of the central fixed tube (14). Part of the hydraulic oil in the compression chamber (200) first passes through the second piston through hole (531) on the buffer piston (53), and then through the first piston through hole (521) on the main piston (52) into the recovery chamber (100). Part of the hydraulic oil passes through the compression hydraulic buffer regulating valve system assembly (8), the central channel of the hydraulic buffer rod (62), the second oil passage hole (142) of the central tube, and the first piston through hole (521) into the recovery chamber (100). The other part of the hydraulic oil... After passing through the high and low speed regulating valve system assembly (9), the hydraulic oil flows into the hydraulic chamber of the nitrogen cylinder (11). At the same time, the compression buffer piston (54) enters the compression hydraulic buffer assembly (6). The compression buffer piston (54) and the compression hydraulic buffer assembly (6) form a closed cavity. The adjustment end hydraulic buffer damping adjustment structure (15) connects the adjustment cavity, the third oil pressure regulating through hole (612), the closed cavity and the external oil reservoir (13). The magnitude of the end compression hydraulic buffer damping force is adjusted by controlling the flow rate of the adjustment cavity through the first buffer adjustment core in the end hydraulic buffer damping adjustment structure (15). S4. When the nitrogen shock absorber is further compressed, at the limit compression stroke, the hydraulic oil in the compression chamber (200) enters the recovery chamber (100) through the second piston through hole (531) and the first piston through hole (521). At the same time, the hydraulic buffer rod (62) enters the central channel of the central fixed tube (14) and covers the second oil passage (142) of the central tube of the central fixed tube (14). At this time, another sealed cavity is formed. The other part of the hydraulic oil passes through the compression high and low speed regulating valve system assembly (9) and finally flows to the hydraulic oil chamber in the nitrogen cylinder (11). S5. When the nitrogen shock absorber is at its limit compression stroke and begins to recover, the hydraulic buffer rod 62 covers the second oil passage (142) of the center tube of the center fixed tube (14). A part of the hydraulic oil in the recovery chamber (100) enters the compression chamber (200) through the first piston through hole (521) and the second piston through hole (531) in sequence. Another part of the hydraulic oil in the recovery chamber (100) enters the compression chamber (200) through the first oil passage (141) of the center tube, the rebound adjustment assembly (2), the center channel of the hydraulic buffer rod (62), and the buffer compression valve piston through hole (811) of the compression hydraulic buffer adjustment valve system assembly (8). The hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber to the compression chamber (200) through the compression high and low speed adjustment valve system assembly (9) under the action of the gas reaction force. S6. When the nitrogen shock absorber is further restored, the hydraulic buffer rod (62) does not cover the second oil passage of the central tube of the central fixed tube 14. Part of the hydraulic oil in the restoration chamber (100) enters the central channel of the hydraulic buffer rod (62) through the first piston through hole (521) and the second oil passage of the central tube (142). The other part of the hydraulic oil in the restoration chamber (100) enters the central channel of the hydraulic buffer rod (62) through the rebound adjustment assembly (2) of the first oil passage of the central tube (141). The hydraulic oil in the central channel of the hydraulic buffer rod (62) enters the compression chamber (200) through the compression hydraulic buffer adjustment valve system assembly (8). Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber to the compression chamber (200) through the compression high and low speed adjustment valve system assembly (9). S7. When the nitrogen shock absorber is further restored, the hydraulic buffer rod leaves the central fixed tube (14). A part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first piston through hole (521) and the second oil passage hole (142) of the central tube. Another part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first oil passage hole (141) of the central tube and the rebound adjustment assembly (2). Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber in the nitrogen cylinder to the compression chamber (200) through the compression high and low speed adjustment valve system assembly (9). S8. When the nitrogen shock absorber is further restored, at the limit of the restoration stroke, a part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first piston through hole (521) and the second oil passage hole (142) of the central tube. Another part of the hydraulic oil in the restoration chamber (100) enters the compression chamber (200) through the first oil passage hole (141) of the central tube and the rebound adjustment assembly (2). Under the action of the gas reaction force, the hydraulic oil in the hydraulic oil chamber in the nitrogen cylinder (11) flows from the hydraulic oil chamber in the nitrogen cylinder (11) through the compression high and low speed adjustment valve system assembly (9) to the compression chamber (200). At the same time, the rebound buffer piston (51) enters the guide to form a sealed cavity.

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