Adjustable nitrogen damper

Abstract

This invention belongs to the field of shock absorber technology and discloses an adjustable nitrogen shock absorber. The spring assembly includes a fixed seat and a spring, with the spring fitted onto a main cylinder and a piston rod. The adjustment assembly includes a mounting seat and a movable sleeve. The mounting seat is fixedly disposed on one of the main cylinder and the piston rod, and the fixed seat is disposed on the other. The movable sleeve is movably connected to the mounting seat. The two ends of the spring respectively abut against the movable sleeve and the fixed seat, which are configured to constrain the two ends of the spring. A pressure cavity is formed between the mounting seat and the movable sleeve. The mounting seat has a connecting port that communicates with the pressure cavity. The connecting port is configured to inject fluid and create fluid pressure to drive the movable sleeve to move axially along the main cylinder and adjust the unloaded assembly length of the spring. This adjustable nitrogen shock absorber allows for in-situ adjustment of the unloaded assembly length of the spring while it is installed in a vehicle, improving adjustment efficiency and enhancing vehicle adaptability and operational flexibility.

Description

Technical Field

[0001] This invention relates to the field of vibration damper technology, and more particularly to an adjustable nitrogen vibration damper. Background Technology

[0002] Nitrogen shock absorbers are vibration damping devices that use high-pressure nitrogen gas to fill the working cylinder. They utilize the compressibility of high-pressure nitrogen to compensate for pressure fluctuations in the damping oil during reciprocating motion, thus maintaining damping stability under high-frequency, high-amplitude conditions. They are widely used in the suspension systems of off-road and high-performance vehicles. In vehicle suspension systems, nitrogen shock absorbers are typically used in conjunction with coil springs. The coil springs are fitted onto the outside of the nitrogen shock absorber, and both ends of the coil springs are constrained by mounting seats, which are both mounted on the cylinder of the nitrogen shock absorber. The vehicle height is determined by the spring compression: when the spring is further compressed during installation, the spring preload increases, and under the same sprung load conditions, the compressive displacement of the suspension under the sprung load decreases accordingly, resulting in a raised vehicle height. Conversely, when the spring is further stretched during installation, the spring preload decreases, and under the same sprung load conditions, the compressive displacement of the suspension under the sprung load increases accordingly, resulting in a lower vehicle height. Therefore, by adjusting the position of the spring mounting seats axially on the cylinder, the spring preload can be changed, thereby adjusting the vehicle height.

[0003] However, existing spring mounting brackets are mostly fixed to the hydraulic cylinder using threads, clasps, or bolts. When adjusting the vehicle height, a special tool must first be used to remove the entire nitrogen shock absorber from the suspension system to disassemble the spring. Then, the installation position of one of the mounting brackets must be manually adjusted, and after reassembling the spring, the entire nitrogen shock absorber is reinstalled on the suspension system. This process is cumbersome, time-consuming, and extremely inefficient. Repeated disassembly can easily damage the threads or loosen connections, affecting reliability. Furthermore, it is impossible to adjust the vehicle height in its original position while the nitrogen shock absorber is installed, and it cannot adjust the vehicle height in real time according to different road conditions, resulting in poor vehicle adaptability and operational flexibility. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable nitrogen shock absorber, which can solve the problems of existing nitrogen shock absorbers requiring complete disassembly and assembly for spring preload adjustment, resulting in cumbersome operation, reduced connection reliability, and poor adaptability to vehicle operating conditions.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An adjustable nitrogen gas vibration damper is provided, comprising a main cylinder and a piston rod, wherein the piston rod is reciprocally connected to the main cylinder along the axial direction of the main cylinder, and the adjustable nitrogen gas vibration damper further comprises:

[0007] A spring assembly, comprising a fixed base and a spring, wherein the spring is fitted onto the main hydraulic cylinder and the piston rod;

[0008] An adjusting assembly includes a mounting base and a movable sleeve. The mounting base is fixedly disposed on one of the main cylinder and the piston rod, and a fixed base is disposed on the other. The movable sleeve is movably connected to the mounting base. The two ends of the spring abut against the movable sleeve and the fixed base respectively. The movable sleeve and the fixed base are configured to constrain the two ends of the spring. A pressure cavity is formed between the mounting base and the movable sleeve. The mounting base has a communication port communicating with the pressure cavity. The communication port is configured to inject fluid and form fluid pressure to drive the movable sleeve to move axially along the main cylinder and adjust the unloaded assembly length of the spring.

[0009] In one embodiment, the adjusting assembly further includes a limiting member fixedly connected to the mounting base, the limiting member extending radially along the adjusting assembly, and the limiting member configured to abut against and limit the axial position of the movable sleeve.

[0010] In one embodiment, the mounting base is further provided with a limiting end face, and the limiting end face and the limiting member are spaced apart along the axial direction of the main oil cylinder. In the initial state, the end of the movable sleeve away from the limiting member abuts against the limiting end face.

[0011] In one embodiment, the limiting member is an annular body, which is fixedly fitted onto the mounting base and extends circumferentially around the mounting base. The limiting member is disposed within the pressure chamber, or the limiting member is disposed outside the pressure chamber.

[0012] In one embodiment, the mounting base is fixedly connected to the end of the piston rod away from the main cylinder, and the movable sleeve includes:

[0013] A first cylindrical cover is movably connected to the mounting base, and a first groove is provided at the end of the first cylindrical cover away from the mounting base;

[0014] The second cylinder cover is connected to the first cylinder cover and embedded in the first groove. The second cylinder cover is movably sleeved on the piston rod and seals the first groove to form the pressure chamber.

[0015] An adjusting seat is fixedly fitted onto the outside of the first cylindrical cover, and the adjusting seat abuts against the end of the spring away from the fixed seat.

[0016] In one embodiment, in the initial state, the bottom of the second cap and the first groove are spaced apart, and the volume of the pressure chamber is greater than zero; and / or,

[0017] The communication port is located on the side of the mounting base, and an annular communication cavity is formed between the mounting base and the piston rod. One end of the annular communication cavity is connected to the pressure chamber, and the other end is connected to the communication port.

[0018] In one embodiment, at least one oil seal ring is provided between the second cylinder cover and the piston rod; and / or,

[0019] At least one oil seal ring is provided between the first cylinder cover and the mounting base; and / or,

[0020] At least one sealing ring is provided between the first cylinder cover and the second cylinder cover; and / or,

[0021] The first cylinder cover and the second cylinder cover are threaded together.

[0022] In one embodiment, the mounting base is fixedly connected to the end of the main cylinder away from the piston rod. The mounting base is fitted onto the outside of the main cylinder. The mounting base includes a flange end and a support end arranged sequentially along the axial direction of the main cylinder. The radial dimension of the flange end is larger than the radial dimension of the support end. The movable sleeve includes a first sleeve portion and a second sleeve portion arranged sequentially along the axial direction of the main cylinder. The inner diameter of the first sleeve portion is larger than the inner diameter of the second sleeve portion. The first sleeve portion is fitted onto the outside of the flange end, and the second sleeve portion is fitted onto the outside of the support end. The end face of the second sleeve portion, the end face of the flange end, the inner wall of the first sleeve portion, and the outer wall of the support end enclose the pressure cavity. The second sleeve portion abuts against the end of the spring away from the fixed base.

[0023] The adjustment assembly further includes a limiting member, which is fixedly connected to the support end and extends along the axial direction of the adjustment assembly. The limiting member is configured to abut against and limit the axial position of the second sleeve portion.

[0024] In one embodiment, in the initial state, the second sleeve portion abuts against the flange end, and the volume of the pressure chamber is zero; and / or,

[0025] The connecting port extends parallel to the axial direction of the main cylinder to pass through both ends of the flange and is directly connected to the pressure chamber.

[0026] In one embodiment, at least one sealing ring is provided between the first sleeve portion and the flange end; and / or,

[0027] At least one sealing ring is provided between the second sleeve portion and the support end.

[0028] The beneficial effects of this invention are:

[0029] 1. The adjustable nitrogen shock absorber provided by this invention forms a pressure chamber between the mounting base and the movable sleeve. Fluid is injected into the pressure chamber through the connecting port, creating fluid pressure. This fluid pressure directly acts on the movable sleeve, driving it to move axially along the main cylinder. Since one end of the spring abuts against the movable sleeve, the axial movement of the movable sleeve directly changes the unloaded assembly length of the spring, thereby changing the spring's preload and thus adjusting the vehicle height. The entire adjustment process is completed by injecting fluid through the connecting port, eliminating the need to disassemble the spring or use a spring compressor. This avoids the risk of injury from sudden release of elastic potential energy during spring compression during reinstallation, making the operation simple and safe. The adjustment process does not require disassembling the entire adjustable nitrogen shock absorber, greatly improving adjustment efficiency and making operation more convenient. Furthermore, it allows for in-situ adjustment while the adjustable nitrogen shock absorber is installed in the vehicle, enabling real-time adjustment of the vehicle height according to different road conditions, improving vehicle adaptability and operational flexibility. In addition, the movable sleeve is driven by the fluid pressure in the pressure chamber. The magnitude of the fluid pressure and the volume of the injected fluid can be precisely controlled. The axial displacement of the movable sleeve can be continuously and steplessly adjusted. As a result, the unloaded assembly length and preload of the spring can be precisely set, increasing the application conditions of the adjustable nitrogen vibration damper.

[0030] 2. The mounting base is fixedly connected to the end of the main cylinder furthest from the piston rod. The mounting base is fitted onto the outside of the main cylinder and includes a flange end and a support end arranged sequentially along the axial direction of the main cylinder. The radial dimension of the flange end is larger than that of the support end. The movable sleeve includes a first sleeve portion and a second sleeve portion arranged sequentially along the axial direction of the main cylinder. The inner diameter of the first sleeve portion is larger than that of the second sleeve portion. The first sleeve portion is fitted onto the flange end, and the second sleeve portion is fitted onto the support end. The end face of the second sleeve portion, the end face of the flange end, the inner wall of the first sleeve portion, and the outer wall of the support end form a pressure cavity. The second sleeve portion abuts against the end of the spring furthest from the fixed base. A limiting member is provided on the support end and located outside the pressure cavity to abut against and limit the axial movement of the movable sleeve. With the above configuration, the mounting base includes flange ends and support ends with different radial dimensions. The movable sleeve is correspondingly provided with a first sleeve section and a second sleeve section with matching inner diameters. The pressure cavity is formed by the direct enclosure of the end faces of each component and the cylinder wall, resulting in high structural integration, small overall radial footprint, and suitability for confined assembly spaces. Moreover, the mounting base and the movable sleeve form a two-stage nested structure, improving guiding performance, ensuring the coaxiality of the axial movement of the movable sleeve, and reducing eccentric friction. The second sleeve section directly abuts against the spring, resulting in a short force transmission path and stable force transmission. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of the adjustable nitrogen vibration damper described in Embodiment 1 of the present invention;

[0032] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0033] Figure 3 This is a cross-sectional view of the adjustable nitrogen vibration damper described in Embodiment 2 of the present invention;

[0034] Figure 4 yes Figure 3 A magnified view of part B in the diagram.

[0035] In the picture:

[0036] 1. Main cylinder; 2. Piston rod; 3. Spring assembly; 31. Fixed seat; 32. Spring; 4. Adjusting assembly; 41. Mounting seat; 411. Connecting port; 412. Limiting end face; 413. Annular connecting cavity; 414. Flange end; 415. Support end; 42. Movable sleeve; 421. First sleeve cover; 4211. First groove; 422. Second sleeve cover; 423. Adjusting seat; 424. First sleeve part; 425. Second sleeve part; 43. Pressure chamber; 44. Limiting element; 45. Hydraulic sleeve; 51. Oil seal ring; 52. Sealing ring. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] like Figure 1 and Figure 2 As shown, the present invention provides an adjustable nitrogen vibration damper, which includes a main cylinder 1 and a piston rod 2. The piston rod 2 is reciprocatingly connected to the main cylinder 1 along the axial direction of the main cylinder 1.

[0044] The adjustable nitrogen shock absorber also includes a spring assembly 3 and an adjusting assembly 4. The spring assembly 3 includes a fixed seat 31 and a spring 32, with the spring 32 fitted onto the main cylinder 1 and the piston rod 2. The adjusting assembly 4 includes a mounting seat 41 and a movable sleeve 42. The mounting seat 41 is fixedly disposed on one of the main cylinder 1 and the piston rod 2, and the fixed seat 31 is disposed on the other. The movable sleeve 42 is movably connected to the mounting seat 41, and the two ends of the spring 32 abut against the movable sleeve 42 and the fixed seat 31, respectively. The movable sleeve 42 and the fixed seat 31 are configured to constrain the two ends of the spring 32. The mounting seat 41 and the movable sleeve 42 enclose a pressure chamber 43. The mounting seat 41 has a connecting port 411 that communicates with the pressure chamber 43. The connecting port 411 is configured to inject fluid and create fluid pressure to drive the movable sleeve 42 to move axially along the main cylinder 1 and adjust the unloaded assembly length of the spring 32. The pressure chamber 43 is directly formed by the mounting base 41 and the movable sleeve 42, eliminating the need for a separate drive cylinder and simplifying the structure. The adjustment assembly 4 and the spring assembly 3 are integrated along the axial direction of the adjustable nitrogen shock absorber, making full use of space and resulting in a compact overall structure that facilitates installation and arrangement in the vehicle suspension. Furthermore, depending on the space constraints of the vehicle suspension, the adjustment assembly 4 can be placed on the main cylinder 1 or the piston rod 2, making the structure more flexible.

[0045] With the above configuration, a pressure chamber 43 is formed between the mounting base 41 and the movable sleeve 42. Fluid is injected into the pressure chamber 43 through the connecting port 411, creating fluid pressure. This fluid pressure directly acts on the movable sleeve 42, driving it to move axially along the main cylinder 1. Since one end of the spring 32 abuts against the movable sleeve 42, the axial movement of the movable sleeve 42 directly changes the unloaded assembly length of the spring 32, thereby changing the preload of the spring 32 and thus adjusting the vehicle height. The entire adjustment process is completed by injecting fluid through the connecting port 411, without disassembling the spring 32 or using a spring compressor to compress it. This avoids the risk of injury caused by the sudden release of elastic potential energy during spring compression during reinstallation, making the operation simple and safe. The adjustment process does not require disassembling the entire adjustable nitrogen shock absorber, greatly improving adjustment efficiency and making operation more convenient. Moreover, it allows for in-situ adjustment while the adjustable nitrogen shock absorber is installed, enabling real-time adjustment of the vehicle height according to different road conditions, improving vehicle adaptability and flexibility. In addition, the movable sleeve 42 is driven by the fluid pressure in the pressure chamber 43. The magnitude of the fluid pressure and the volume of the injected fluid can be precisely controlled. The axial displacement of the movable sleeve 42 can be continuously and steplessly adjusted. As a result, the unloaded assembly length and preload of the spring 32 can be precisely set, increasing the application conditions of the adjustable nitrogen vibration damper.

[0046] When the adjustable nitrogen shock absorber is unloaded, if the distance between the movable sleeve 42 and the fixed seat 31 decreases, the pre-compression of the spring 32 in the initial state increases to increase the preload. After adjustment, when the load conditions on the spring 32 are the same, the further compression displacement of the vehicle suspension caused by the sprung load decreases, thus raising the vehicle body. Conversely, if the distance between the movable sleeve 42 and the fixed seat 31 increases, the pre-compression of the spring 32 in the initial state decreases to reduce the preload. After adjustment, when the load conditions on the spring 32 are the same, the further compression displacement of the vehicle suspension caused by the sprung load increases, thus lowering the vehicle body.

[0047] The connecting port 411 is connected to an external pressure device (not shown in the figure) via an external pipe. This external pressure device, such as an electric hydraulic pump or an electric oil pump, can precisely control the volume of fluid injected into the pressure chamber 43 through the connecting port 411 and has a pressure-holding function to maintain the pressure within the pressure chamber 43 and ensure the axial position of the movable sleeve 42. The specific structure of the external pressure device can be set with reference to existing technology, and will not be described in detail in this embodiment.

[0048] Optionally, the adjusting assembly 4 also includes a limiting member 44, which is fixedly connected to the mounting base 41 and extends radially along the adjusting assembly 4. The limiting member 44 is configured to abut against the axial position of the limiting movable sleeve 42. Driven by the fluid pressure in the pressure chamber 43, the movable sleeve 42 undergoes axial displacement until the limiting member 44 abuts against the movable sleeve 42, forming a mechanical limit. Compared to a structure that uses threaded connections to limit the axial position, the axial abutment between the limiting member 44 and the movable sleeve 42 is less prone to loosening or failure due to vibration. The limiting is reliable and stable, effectively restricting the axial displacement of the movable sleeve 42, maintaining a stable unloaded assembly length of the spring 32 after adjustment, and improving the vibration resistance and operational reliability of the adjusting assembly 4.

[0049] To limit the unloaded assembly length of spring 32 in the initial state, mounting base 41 is also provided with a limiting end face 412. The limiting end face 412 and the limiting member 44 are spaced apart along the axial direction of the main cylinder 1. In the initial state, the end of movable sleeve 42 away from the limiting member 44 abuts against the limiting end face 412. Under the preload of spring 32, movable sleeve 42 tightly abuts against the limiting end face 412. Under the constraint of spring 32 and limiting end face 412, movable sleeve 42 maintains a stable axial position, improving the positional accuracy and vibration resistance of spring 32 in the initial state.

[0050] Optionally, the limiting member 44 is an annular body, which is fixedly fitted onto the mounting base 41 and extends circumferentially around the mounting base 41. The limiting member 44 can form an abutment with the movable sleeve 42 in all directions along the circumference, thus uniformly distributing the force on the movable sleeve 42 and avoiding stress concentration caused by localized force, which could lead to skewing. Moreover, under vibration conditions, the circumferential annular abutment allows the limiting member 44 to stably withstand axial impact loads, further improving the reliability of the limiting and preventing jamming and deformation problems caused by localized eccentric loads.

[0051] In this embodiment, the mounting base 41 is fixedly connected to the end of the piston rod 2 away from the main cylinder 1. The movable sleeve 42 includes a first sleeve cover 421, a second sleeve cover 422, and an adjusting seat 423. The first sleeve cover 421 is movably connected to the mounting base 41, and a first groove 4211 is formed at the end of the first sleeve cover 421 away from the mounting base 41. The second sleeve cover 422 is connected to the first sleeve cover 421 and is embedded in the first groove 4211. The second sleeve cover 422 is movably sleeved on the piston rod 2, and the second sleeve cover 422 seals the first groove 4211 to form a pressure chamber 43. The adjusting seat 423 is fixedly sleeved outside the first sleeve cover 421, and the adjusting seat 423 abuts against the end of the spring 32 away from the fixed seat 31. The movable sleeve 42 adopts a split assembly structure consisting of a first sleeve cover 421, a second sleeve cover 422, and an adjusting seat 423. The second sleeve cover 422 is embedded in the first groove 4211 and sleeved on the piston rod 2, achieving a sealed enclosure of the pressure chamber 43, which is convenient for assembly. The adjusting seat 423 is fixedly fitted on the outside of the first sleeve cover 421, which can position and abut against the spring 32. The force of the spring 32 is directly transmitted to the movable sleeve 42, with a short force transmission path and sensitive buffering. The second sleeve cover 422 provides guiding and sealing functions, and the adjusting seat 423 provides limiting function for the spring 32. The structure is compact and helps to ensure the sealing performance of the pressure chamber 43 and the stress stability of the spring 32.

[0052] Furthermore, the mounting base 41 can also serve as a connection structure for the piston rod 2, which is connected to the vehicle suspension via the mounting base 41.

[0053] In the initial state, the bottoms of the second cylinder cover 422 and the first groove 4211 are spaced apart, and the volume of the pressure chamber 43 is greater than zero, reserving an initial accommodating space for fluid to enter the pressure chamber 43. After the fluid is injected, the working pressure can be established smoothly, ensuring that the driving action can be triggered normally. The fluid pressure can quickly and effectively drive the movable sleeve 42 to produce axial displacement.

[0054] Since the pressure chamber 43 has a large volume in the initial state, the adjustment component 4 also includes a hydraulic sleeve 45. The hydraulic sleeve 45 is fitted on the piston rod 2. One end of the hydraulic sleeve 45 is fixedly connected to the mounting base 41, and the other end extends into the pressure chamber 43. The limiting member 44 is located at the end of the hydraulic sleeve 45 away from the mounting base 41. The limiting member 44 is located inside the pressure chamber 43, without needing to occupy additional external axial space. The axial layout is compact and highly integrated.

[0055] In this embodiment, the connecting port 411 is located on the side of the mounting base 41, forming an annular connecting cavity 413 between the mounting base 41 and the piston rod 2. One end of the annular connecting cavity 413 is connected to the pressure chamber 43, and the other end is connected to the connecting port 411. Fluid is injected circumferentially into the pressure chamber 43 through the annular connecting cavity 413, ensuring uniform fluid flow circumferentially inside the pressure chamber 43 and balanced circumferential force on the movable sleeve 42, thus reducing the risk of off-center loading and jamming.

[0056] Optionally, at least one oil seal ring 51 is provided between the second cylinder cover 422 and the piston rod 2 to maintain a seal when the second cylinder cover 422 moves relative to the piston rod 2, which can prevent external impurities from entering the pressure chamber 43, prevent fluid leakage in the pressure chamber 43, and reduce motion wear.

[0057] Optionally, at least one oil seal ring 51 is provided between the first cylinder cover 421 and the mounting base 41. The first cylinder cover 421 and the mounting base 41 generate relative movement. The oil seal ring 51 can block external impurities from entering the pressure chamber 43, while preventing fluid leakage in the pressure chamber 43, reducing wear on the mating parts, and improving the sealing reliability of the connection position.

[0058] Optionally, the hydraulic sleeve 45 and the mounting base 41 form an integral structure, and the oil seal ring 51 is disposed between the first cylinder cover 421 and the hydraulic sleeve 45, such as... Figure 2 As shown.

[0059] Optionally, the first cap 421 and the second cap 422 are threaded together to facilitate quick assembly of the movable sleeve 42. Optionally, at least one sealing ring 52 is provided between the first cap 421 and the second cap 422 to achieve a better static sealing effect.

[0060] Example 2

[0061] This second embodiment provides an adjustable nitrogen shock absorber, featuring the spring assembly 3 and adjustment assembly 4 from the first embodiment. The spring assembly 3 includes a fixed seat 31 and a spring 32, with the spring 32 mounted on the main cylinder 1 and piston rod 2. The adjustment assembly 4 includes a mounting seat 41 and a movable sleeve 42, with both ends of the spring 32 abutting against the movable sleeve 42 and the fixed seat 31, respectively. The movable sleeve 42 and the fixed seat 31 are configured to constrain both ends of the spring 32. A pressure chamber 43 is formed between the mounting seat 41 and the movable sleeve 42. The mounting seat 41 has a connecting port 411 that communicates with the pressure chamber 43. The connecting port 411 is configured to inject fluid and create fluid pressure to drive the movable sleeve 42 to move axially along the main cylinder 1 and adjust the unloaded assembly length of the spring 32, thereby achieving quick, safe, and flexible adjustment of the vehicle body height.

[0062] like Figure 3 and Figure 4 As shown, the difference in this embodiment is that the mounting base 41 is fixedly connected to the end of the main cylinder 1 away from the piston rod 2. The mounting base 41 is fitted onto the outside of the main cylinder 1. The mounting base 41 includes a flange end 414 and a support end 415 arranged sequentially along the axial direction of the main cylinder 1. The radial dimension of the flange end 414 is larger than the radial dimension of the support end 415. The movable sleeve 42 includes a first sleeve portion 424 and a second sleeve portion 425 arranged sequentially along the axial direction of the main cylinder 1. The inner diameter of the first sleeve portion 424 is larger than the inner diameter of the second sleeve portion 425. The first sleeve portion 424 is fitted onto the flange end 414, and the second sleeve portion 425 is fitted onto the support end 415. The end face of the second sleeve portion 425, the end face of the flange end 414, the inner wall of the first sleeve portion 424, and the outer wall of the support end 415 enclose a pressure cavity 43. The second sleeve portion 425 abuts against the end of the spring 32 away from the fixed seat 31.

[0063] With the above configuration, the mounting base 41 includes a flange end 414 and a support end 415 with different radial dimensions. The movable sleeve 42 is correspondingly provided with a first sleeve portion 424 and a second sleeve portion 425 with matching inner diameters. The pressure cavity 43 is formed by the direct enclosure of the end faces of each component and the cylinder wall. The structure has a high degree of integration, a small overall radial footprint, and is suitable for narrow assembly spaces. Moreover, a two-stage nested structure is formed between the mounting base 41 and the movable sleeve 42, which improves the guiding performance, ensures the coaxiality of the axial movement of the movable sleeve 42, and reduces eccentric friction. The second sleeve portion 425 directly abuts against the spring 32, resulting in a short force transmission path and stable force transmission.

[0064] In the initial state, the second sleeve portion 425 abuts against the flange end 414, the volume of the pressure chamber 43 is zero, there is no extra cavity clearance in the axial direction, and the space occupied in the radial direction is reduced, which is suitable for compact installation conditions. In this embodiment, the end face of the flange end 414 facing the second sleeve portion 425 forms the limiting end face 412 in Embodiment 1.

[0065] The connecting port 411 extends parallel to the axial direction of the main cylinder 1, passing through both ends of the flange end 414, and directly connects to the pressure chamber 43. The connecting port 411 adopts an axial layout, eliminating the need for additional radial openings. The external pipe at the connecting port 411 also extends axially, compressing and adjusting the overall radial dimension of the nitrogen vibration damper to fit into confined assembly spaces. Fluid is injected into the pressure chamber 43 through a straight channel; the flow path formed by the connecting port 411 is short, resulting in minimal pressure loss.

[0066] In this embodiment, since the volume of the pressure chamber 43 is zero in the initial state, the limiting member 44 is disposed on the support end 415 and located outside the pressure chamber 43. The wear condition of the limiting member 44 can be visually observed, and worn limiting members 44 can be quickly disassembled and replaced to ensure limiting reliability. The length of the limiting member 44 extends axially along the adjusting assembly 4, and the thickness of the limiting member 44 protrudes radially along the adjusting assembly 4. The limiting member 44 restricts the axial movement of the second sleeve portion 425 by abutting against the end of the second sleeve portion 425.

[0067] At least one sealing ring 52 is provided between the first sleeve portion 424 and the flange end 414, and at least one sealing ring 52 is provided between the second sleeve portion 425 and the support end 415. The sealing ring 52 is a star-shaped sealing ring, which improves the dynamic sealing performance between the first sleeve portion 424 and the flange end 414, and between the second sleeve portion 425 and the support end 415.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An adjustable nitrogen vibration damper, comprising a main cylinder (1) and a piston rod (2), wherein the piston rod (2) is reciprocally connected to the main cylinder (1) along the axial direction of the main cylinder (1), characterized in that, The adjustable nitrogen vibration damper also includes: A spring assembly (3) includes a fixed base (31) and a spring (32), the spring (32) being fitted onto the main cylinder (1) and the piston rod (2); An adjusting assembly (4) includes a mounting base (41) and a movable sleeve (42). The mounting base (41) is fixedly disposed on one of the main cylinder (1) and the piston rod (2), and a fixed base (31) is disposed on the other. The movable sleeve (42) is movably connected to the mounting base (41). The two ends of the spring (32) abut against the movable sleeve (42) and the fixed base (31) respectively. The fixed seat (31) is configured to constrain both ends of the spring (32). The mounting seat (41) and the movable sleeve (42) enclose a pressure cavity (43). The mounting seat (41) has a communication port (411) that communicates with the pressure cavity (43). The communication port (411) is configured to inject fluid and form fluid pressure to drive the movable sleeve (42) to move axially along the main cylinder (1) and adjust the unloaded assembly length of the spring (32).

2. The adjustable nitrogen vibration damper according to claim 1, characterized in that, The adjustment assembly (4) further includes a limiting member (44) fixedly connected to the mounting base (41), the limiting member (44) extending radially along the adjustment assembly (4), and the limiting member (44) configured to abut against and limit the axial position of the movable sleeve (42).

3. The adjustable nitrogen vibration damper according to claim 2, characterized in that, The mounting base (41) is also provided with a limiting end face (412). The limiting end face (412) and the limiting member (44) are spaced apart along the axial direction of the main oil cylinder (1). In the initial state, the end of the movable sleeve (42) away from the limiting member (44) abuts against the limiting end face (412).

4. The adjustable nitrogen vibration damper according to claim 2, characterized in that, The limiting member (44) is an annular body, which is fixedly fitted onto the mounting base (41) and extends circumferentially around the mounting base (41). The limiting member (44) is disposed inside the pressure cavity (43), or the limiting member (44) is disposed outside the pressure cavity (43).

5. The adjustable nitrogen vibration damper according to claim 1, characterized in that, The mounting base (41) is fixedly connected to the end of the piston rod (2) away from the main cylinder (1), and the movable sleeve (42) includes: A first cylindrical cover (421) is movably connected to the mounting base (41), and a first groove (4211) is provided at one end of the first cylindrical cover (421) away from the mounting base (41). The second cylinder cover (422) is connected to the first cylinder cover (421) and embedded in the first groove (4211). The second cylinder cover (422) is movably sleeved on the piston rod (2). The second cylinder cover (422) seals the first groove (4211) to form the pressure chamber (43). Adjustment seat (423) is fixedly fitted outside the first cylinder cover (421), and the adjustment seat (423) abuts against the end of the spring (32) away from the fixed seat (31).

6. The adjustable nitrogen vibration damper according to claim 5, characterized in that, In the initial state, the bottoms of the second cylinder cover (422) and the first groove (4211) are spaced apart, and the volume of the pressure chamber (43) is greater than zero; and / or, The connecting port (411) is opened on the side of the mounting base (41), and an annular connecting cavity (413) is formed between the mounting base (41) and the piston rod (2). One end of the annular connecting cavity (413) is connected to the pressure chamber (43), and the other end is connected to the connecting port (411).

7. The adjustable nitrogen vibration damper according to claim 5, characterized in that, At least one oil seal ring (51) is provided between the second cylinder cover (422) and the piston rod (2); and / or, At least one oil seal ring (51) is provided between the first cylinder cover (421) and the mounting base (41); and / or, At least one sealing ring (52) is provided between the first cylindrical cover (421) and the second cylindrical cover (422); and / or, The first cap (421) and the second cap (422) are threaded together.

8. The adjustable nitrogen vibration damper according to claim 1, characterized in that, The mounting base (41) is fixedly connected to the end of the main cylinder (1) away from the piston rod (2). The mounting base (41) is fitted onto the outside of the main cylinder (1). The mounting base (41) includes a flange end (414) and a support end (415) arranged sequentially along the axial direction of the main cylinder (1). The radial dimension of the flange end (414) is larger than the radial dimension of the support end (415). The movable sleeve (42) includes a first sleeve portion (424) and a second sleeve portion (425) arranged sequentially along the axial direction of the main cylinder (1). The first sleeve portion... The inner diameter of the first sleeve part (424) is larger than the inner diameter of the second sleeve part (425). The first sleeve part (424) is fitted outside the flange end (414), and the second sleeve part (425) is fitted outside the support end (415). The end face of the second sleeve part (425), the end face of the flange end (414), the inner wall of the first sleeve part (424), and the outer wall of the support end (415) enclose the pressure cavity (43). The second sleeve part (425) abuts against the end of the spring (32) away from the fixed seat (31). The adjustment assembly (4) further includes a limiting member (44), which is fixedly connected to the support end (415). The limiting member (44) extends along the axial direction of the adjustment assembly (4) and is configured to abut against and limit the axial position of the second sleeve portion (425).

9. The adjustable nitrogen vibration damper according to claim 8, characterized in that, In the initial state, the second sleeve portion (425) abuts against the flange end (414), and the volume of the pressure chamber (43) is zero; and / or, The connecting port (411) extends parallel to the axial direction of the main cylinder (1) to pass through both ends of the flange end (414) and is directly connected to the pressure chamber (43).

10. The adjustable nitrogen vibration damper according to claim 8, characterized in that, At least one sealing ring (52) is provided between the first sleeve portion (424) and the flange end (414); and / or, At least one sealing ring (52) is provided between the second sleeve portion (425) and the support end (415).

Images