Rear suspension nitrogen damper and vehicle

Abstract

The utility model belongs to mechanical damping technical field discloses a kind of rear suspension nitrogen shock absorber and vehicle. The rear suspension nitrogen shock absorber includes oil storage cylinder, nitrogen cylinder, piston rod, main piston valve system and sealing assembly, nitrogen cylinder is set to one side of oil storage cylinder, and the inner chamber of nitrogen cylinder is equipped with nitrogen cavity and oil cavity;Piston rod one end sealing sliding connection is in the inner chamber of oil storage cylinder;Main piston valve system is set to the inner chamber of oil storage cylinder and is connected with the one end of piston rod, and main piston valve system divides the inner chamber of oil storage cylinder into first chamber and second chamber, and first chamber is communicated in oil cavity;Sealing assembly is set to the inner chamber wall of oil storage cylinder and is sealing sliding connection with piston rod, and sealing assembly includes dustproof sealing group and oil seal group, and oil seal group includes first oil seal piece and second oil seal piece, and first oil seal piece and second oil seal piece are all with the outer wall of piston rod interference fit, and second oil seal piece is heat-resistant oil seal piece. The rear suspension nitrogen shock absorber can improve the high-temperature resistance of sealing assembly and the service life of itself.

Description

Technical Field

[0001] This utility model relates to the field of mechanical vibration reduction technology, and in particular to a rear suspension nitrogen shock absorber and vehicle. Background Technology

[0002] The rear suspension shock absorber is a core component of the vehicle's suspension system. Located on the rear suspension, it primarily functions as a damper, working in conjunction with the springs and suspension structure to reduce risks such as rebound and rollover. Nitrogen shock absorbers, due to their precise damping control and high stability, are widely used in the field of vehicle rear suspension shock absorbers.

[0003] However, in existing nitrogen shock absorbers, the sealing structure between the piston rod and the oil reservoir typically uses a dust seal + HNBR oil seal, which has a certain sealing effect. However, during long-term vehicle use, especially under extreme road conditions or during durability tests, the nitrogen shock absorber will be exposed to high temperatures. The existing sealing structure has poor high-temperature resistance and is prone to seal failure under high-temperature conditions, thus reducing the service life of the nitrogen shock absorber.

[0004] Therefore, there is an urgent need for a nitrogen shock absorber for rear suspension and a vehicle to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a rear suspension nitrogen shock absorber that can improve the high-temperature resistance of the sealing components and extend the service life of the rear suspension nitrogen shock absorber.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A nitrogen-filled rear suspension shock absorber, mounted on the rear suspension system of a vehicle, comprising:

[0008] An oil storage tank and a nitrogen cylinder are provided. The inner cavity of the oil storage tank is filled with oil. The nitrogen cylinder is located on one side of the oil storage tank. The inner cavity of the nitrogen cylinder is provided with a nitrogen chamber and an oil chamber. The nitrogen chamber is filled with nitrogen gas, and the oil chamber is connected to the oil storage tank.

[0009] The piston rod is slidably and sealed at one end to the inner cavity of the oil reservoir;

[0010] The main piston valve system is located in the inner cavity of the oil reservoir and connected to one end of the piston rod. The main piston valve system divides the inner cavity of the oil reservoir into a first chamber and a second chamber, and the first chamber is connected to the oil chamber.

[0011] A sealing assembly is disposed on the cavity wall of the inner cavity of the oil reservoir and is slidably connected to the piston rod in a sealing manner. The sealing assembly includes a dustproof sealing group and an oil seal group arranged sequentially from the outside to the inside along the axial direction of the oil reservoir. The oil seal group includes a first oil seal and a second oil seal arranged sequentially from the outside to the inside along the axial direction of the oil reservoir. Both the first oil seal and the second oil seal are interference-fitted with the outer wall of the piston rod. The second oil seal is a heat-resistant oil seal.

[0012] Optionally, the first oil seal is a hydrogenated nitrile rubber oil seal structure.

[0013] Optionally, the second oil seal includes an integrally formed first oil seal portion and a second oil seal portion, wherein the first oil seal portion is a fluororubber oil seal structure and the second oil seal portion is a polytetrafluoroethylene oil seal structure.

[0014] Optionally, the dustproof seal assembly includes:

[0015] A first dustproof seal is disposed on one side of the oil seal assembly. The first dustproof seal includes two spaced-apart first dustproof lips. The first dustproof lips are interference-fitted with the outer wall of the piston rod to prevent dust from entering the inner cavity of the oil reservoir.

[0016] The second dustproof seal is disposed on the side of the first dustproof seal away from the oil seal assembly. The second dustproof seal includes a second dustproof lip, which is interference-fitted with the outer wall of the piston rod to prevent dust from entering the inner cavity of the oil reservoir.

[0017] Optionally, it also includes a floating piston assembly, which is slidably connected to the inner cavity of the nitrogen cylinder and divides the inner cavity of the nitrogen cylinder into the nitrogen chamber and the oil chamber.

[0018] Optionally, it also includes a compression regulating valve, which is disposed between the oil chamber and the first chamber, and is used to regulate the oil flow rate.

[0019] Optionally, it further includes a first connecting seat and a second connecting seat, wherein the first connecting seat is disposed at the end of the oil reservoir away from the piston rod, and the second connecting seat is disposed at the end of the piston rod away from the oil reservoir, and the first connecting seat and the second connecting seat are respectively used for external connection.

[0020] Optionally, a knurled screw is press-fitted into the lug of the first connecting seat, and the knurled screw is used for fixed connection with the external structure.

[0021] Optionally, it also includes a protective component, one end of which is fixedly connected to the second connecting seat, and the other end extends and covers the outer periphery of the portion of the piston rod that does not extend into the oil reservoir.

[0022] Another objective of this invention is to provide a vehicle comprising a rear suspension system and the aforementioned rear suspension nitrogen shock absorber, wherein the rear suspension nitrogen shock absorber is disposed on the rear suspension system.

[0023] The beneficial effects of this utility model are:

[0024] This invention provides a rear suspension nitrogen shock absorber and a vehicle. When the piston rod drives the main piston valve system to move axially toward the oil reservoir, the volume of the first chamber decreases, the oil in the first chamber is squeezed and at least partially flows into the oil chamber, changing the oil volume in the nitrogen cylinder and generating a damping force, thus achieving its damping effect. During this process, the piston rod and the oil reservoir are sealed by a sealing assembly. A dustproof sealing group is used to block and protect against external dust. An oil seal group is also provided, containing a heat-resistant second oil seal with good high-temperature resistance. This means that even under extreme road conditions or when the nitrogen shock absorber is subjected to high temperatures during durability tests, the second oil seal maintains a good sealing effect. Through the dual design of dustproof sealing and oil seals, specifically the heat-resistant oil seal within the oil seal, the sealing effect of the rear suspension nitrogen shock absorber is effectively improved, thereby increasing its service life. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the rear suspension nitrogen shock absorber provided in a specific embodiment of this utility model;

[0026] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0027] In the picture:

[0028] 10. Oil storage tank; 101. First chamber; 102. Second chamber;

[0029] 20. Piston rod;

[0030] 30. Main piston valve system;

[0031] 40. Sealing assembly; 41. Dustproof seal assembly; 411. First dustproof seal; 412. Second dustproof seal; 42. Oil seal assembly; 421. First oil seal; 422. Second oil seal;

[0032] 50. Nitrogen cylinder; 501. Nitrogen chamber; 502. Oil chamber;

[0033] 60. Floating piston assembly; 70. Nozzle cover assembly; 80. Guide; 90. Limit cover; 100. Compression regulating valve;

[0034] 110. First connecting seat; 111. Knurled screw;

[0035] 120. Second connecting seat; 130. Rubber bushing; 140. Buffer block; 150. Protective component. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or 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 embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] The following reference Figure 1 and Figure 2 This invention introduces the nitrogen shock absorber for rear suspension and the vehicle provided by this utility model.

[0041] This embodiment provides a nitrogen shock absorber for rear suspension, which is installed on the rear suspension system of a vehicle and is used as a damper to control the movement of the spring. By working in conjunction with the spring and suspension structure, it can reduce the risks of rebound and rollover.

[0042] Please refer to Figure 1 and Figure 2 Specifically, the rear suspension nitrogen shock absorber includes an oil reservoir 10, a nitrogen cylinder 50, a piston rod 20, a main piston valve system 30, and a sealing assembly 40. The oil reservoir 10 contains oil. The nitrogen cylinder 50 is located on one side of the oil reservoir 10, and its inner cavity includes a nitrogen chamber 501 and an oil chamber 502. The nitrogen chamber 501 contains nitrogen, and the oil chamber 502 is connected to the oil reservoir 10.

[0043] One end of the piston rod 20 is slidably and sealed to the inner cavity of the oil reservoir 10; the main piston valve system 30 is disposed in the inner cavity of the oil reservoir 10 and connected to one end of the piston rod 20. The main piston valve system 30 divides the inner cavity of the oil reservoir 10 into a first chamber 101 and a second chamber 102. The first chamber 101 is connected to the oil chamber 502. By driving the main piston valve system 30 to reciprocate, at least a portion of the oil in the first chamber 101 can flow into or out of the oil chamber 502.

[0044] The sealing assembly 40 is disposed on the cavity wall of the inner cavity of the oil reservoir 10 and is slidably connected to the piston rod 20. The sealing assembly 40 includes a dustproof sealing group 41 and an oil seal group 42 arranged sequentially from the outside to the inside along the axial direction of the oil reservoir 10. The oil seal group 42 includes a first oil seal 421 and a second oil seal 422 arranged sequentially from the outside to the inside along the axial direction of the oil reservoir 10. Both the first oil seal 421 and the second oil seal 422 are interference-fitted with the outer wall of the piston rod 20. The second oil seal 422 is a heat-resistant oil seal. By setting the heat-resistant oil seal, the heat resistance of the sealing assembly 40 is improved, thereby effectively increasing the sealing protection and extending the service life of the sealing assembly 40.

[0045] In this embodiment, the rear suspension nitrogen shock absorber, when the piston rod 20 drives the main piston valve system 30 to move along the axial direction of the oil reservoir 10 towards the oil reservoir 10, causes the volume of the first chamber 101 to decrease. The oil in the first chamber 101 is squeezed and at least partially flows into the oil chamber 502, changing the amount of oil in the nitrogen cylinder 50 and generating a damping force, thus achieving its damping effect. During this process, the piston rod 20 and the oil reservoir 10 are sealed by the sealing assembly 40. The dustproof sealing group 41 is used to block and protect against external dust. The oil seal group 42 is provided, and the oil seal group 42 is equipped with a second oil seal 422 with heat resistance. Its high temperature resistance is good, that is, even under extreme road conditions or when the nitrogen shock absorber is in a high temperature state due to durability testing, the second oil seal 422 can still maintain a good sealing effect. By employing a dual design of dustproof sealing and oil sealing, specifically the inclusion of a heat-resistant oil seal within the oil seal, the sealing performance of the rear suspension nitrogen shock absorber is effectively improved, thereby extending its service life.

[0046] It is understandable that the specific structures of the oil reservoir 10, piston rod 20, and main piston valve system 30 can directly adopt the structures commonly used in existing nitrogen shock absorbers, and will not be elaborated here. Specifically, the piston rod 20 and main piston valve system 30 can be equipped with corresponding through holes, and the opening and closing of the piston valve system allows for selective communication between the first chamber 101 and the second chamber 102. Furthermore, the size of the communication path can be adjusted through the main piston valve system 30, i.e., the flow rate of the oil. This allows some of the oil in the first chamber 101 to flow into the second chamber 102 when the piston rod 20 drives the main piston valve system 30 to move axially toward the oil reservoir 10, further achieving its damping effect. Alternatively, a third oil passage can be provided so that the oil in the first chamber 101 can enter the third oil passage for adjustment, thereby adjusting the damping force. These can be adaptively set according to actual needs and are not specifically limited here.

[0047] Specifically, the nitrogen cylinder 50 is externally mounted, which increases the heat dissipation surface area of ​​the oil in contact with air, thus effectively controlling the oil temperature.

[0048] Furthermore, the rear suspension nitrogen shock absorber also includes a floating piston assembly 60, which is slidably connected to the inner cavity of the nitrogen cylinder 50 and divides the inner cavity of the nitrogen cylinder 50 into a nitrogen chamber 501 and an oil chamber 502. This design achieves oil-gas separation within the nitrogen cylinder 50, ensuring the oil is in a closed system, uniformly pushed from behind by nitrogen pressure. Regardless of the speed of the piston rod 20, the oil maintains a high positive pressure, fundamentally preventing the formation of air bubbles and cavitation. In the oil-gas separation design, the oil circulates in a relatively independent loop without gas interference, resulting in higher thermal conductivity. Heat is concentrated in the oil reservoir 10 and the oil chamber 502 of the nitrogen cylinder 50, allowing for more efficient heat dissipation through the cylinder wall, significantly improving heat dissipation efficiency and resistance to thermal degradation. The oil-gas separation design also allows the rear suspension nitrogen shock absorber to absorb shocks more smoothly, and the nitrogen pressure can be adjusted as needed to adapt to different road conditions.

[0049] Furthermore, the rear suspension nitrogen shock absorber also includes a nozzle cover assembly 70, that is, a nozzle cover assembly 70 is provided at the end of the nitrogen cylinder 50 away from the oil reservoir 10. It can not only be used to seal the nitrogen cylinder 50, but also connect to the nitrogen filling structure to fill the nitrogen chamber 501.

[0050] Specifically, the rear suspension nitrogen shock absorber also includes a guide 80 and a limiting cap 90. One end of the oil reservoir 10 has an opening, and the guide 80 and limiting cap 90 are sequentially arranged at the opening from the inside out. The piston rod 20 is slidably and sealingly connected to the guide 80. The guide 80 guides the movement of the piston rod 20, and the limiting cap 90 seals the opening. Therefore, a sealing assembly 40 is disposed between the guide 80 and the piston rod 20. Specifically, the sealing assembly 40 abuts against the inner peripheral wall of the guide 80 and the outer peripheral wall of the piston rod 20 to achieve a sealing effect between the piston rod 20 and the guide 80.

[0051] It is understandable that sealing structures are provided between the guide 80 and the inner wall of the oil reservoir 10, and between the limiting cover 90 and the inner wall of the oil reservoir 10, in order to achieve the sealing performance of the oil reservoir 10.

[0052] Optionally, the first oil seal 421 is a hydrogenated nitrile butadiene rubber (HNBR) oil seal, which has excellent oil resistance, wear resistance, and tear resistance. It can assist in sealing oil while allowing a small amount of oil and gas generated inside the rear suspension nitrogen shock absorber due to temperature changes to pass through, thus playing a certain role in balancing pressure. Of course, in other embodiments, the first oil seal 421 can also be an oil seal made of other materials, which is not specifically limited here.

[0053] Optionally, the second oil seal 422 includes an integrally formed first oil seal portion and a second oil seal portion. The first oil seal portion is a fluororubber oil seal structure, and the second oil seal portion is a polytetrafluoroethylene (PTFE) oil seal structure. This PTFE+FKM oil seal structure has an extremely low coefficient of friction, providing an extremely smooth piston rod 20 movement experience. It has a continuous and stable radial clamping force, ensuring a constant sealing pressure throughout its entire lifespan and preventing oil leakage due to wear. Furthermore, it has high high-temperature and low-temperature resistance, maintaining good sealing performance in high-temperature or low-temperature environments, effectively solving the sealing failure problem of the rear suspension nitrogen shock absorber at high temperatures and improving the sealing effect. Of course, in other embodiments, the second oil seal 422 can also be an oil seal made of other heat-resistant materials, which is not specifically limited here.

[0054] Furthermore, the dustproof sealing assembly 41 includes a first dustproof seal 411 and a second dustproof seal 412. The first dustproof seal 411 is disposed on one side of the oil seal assembly 42 and includes two spaced-apart first dustproof lips. The first dustproof lips are interference-fitted with the outer wall of the piston rod 20 to prevent dust from entering the inner cavity of the oil reservoir 10. The second dustproof seal 412 is disposed on the side of the first dustproof seal 411 away from the oil seal assembly 42 and includes a second dustproof lip. The second dustproof lip is interference-fitted with the outer wall of the piston rod 20 to prevent dust from entering the inner cavity of the oil reservoir 10. By setting up double dustproof seals, the possibility of external impurities such as dust, mud, and moisture entering the system is effectively reduced, greatly improving the dustproof effect.

[0055] Please continue to refer to Figure 1 and Figure 2 In this embodiment, the rear suspension nitrogen shock absorber also includes a compression regulating valve 100, which is disposed between the oil chamber 502 and the first chamber 101. The compression regulating valve 100 is used to regulate the oil flow rate and cooperate with the main piston valve system 30, thereby increasing the adjustability of the damping performance.

[0056] Furthermore, the rear suspension nitrogen shock absorber also includes a first connecting seat 110 and a second connecting seat 120. The first connecting seat 110 is located at the end of the oil reservoir 10 away from the piston adjusting mechanism, and the second connecting seat 120 is located at the end of the piston adjusting mechanism away from the oil reservoir 10. The first connecting seat 110 and the second connecting seat 120 are respectively used for external connection. The connection between the rear suspension nitrogen shock absorber and the rear suspension system is achieved by setting the first connecting seat 110 and the second connecting seat 120.

[0057] Specifically, in this embodiment, the first connecting seat 110 is the upper connecting seat and the second connecting seat 120 is the lower connecting seat, so as to realize its external connection.

[0058] Optionally, both the connecting portion of the first connecting seat 110 and the connecting portion of the second connecting seat 120 are provided with rubber bushings 130, which are used for elastic connection with the external structure. That is, the externally connected structure of the first connecting seat 110 and the second connecting seat 120 is connected to the seat body of the first connecting seat 110 through rubber bushings 130, so that it has the functions of elastic vibration isolation and noise reduction, compensation for installation and movement errors, protection of connection parts, and improvement of durability and stability.

[0059] Specifically, a knurled screw 111 is press-fitted into the lug of the first connecting seat 110. The knurled screw 111 is used for fixed connection with the external structure. By setting the knurled screw 111, the rear suspension nitrogen shock absorber can be better positioned when installed externally.

[0060] Furthermore, the rear suspension nitrogen shock absorber also includes a buffer block 140, which is sleeved on the outer periphery of the other end of the piston rod 20 and located at the end of the second connecting seat 120 facing the oil reservoir 10. The buffer block 140 has the function of buffering and shock absorption, protecting the rear suspension nitrogen shock absorber.

[0061] Furthermore, the rear suspension nitrogen shock absorber also includes a protective component 150. One end of the protective component 150 is fixedly connected to the second connecting seat 120, and the other end extends and covers the outer periphery of the portion of the piston rod 20 that does not extend into the oil reservoir 10, thereby protecting the portion of the piston rod 20 that is not located in the oil reservoir 10. The protective component 150 includes a fixing part and a protective cover. The fixing part is fixedly connected to the second connecting seat 120, and one end of the protective cover is connected to the fixing part, while the other end extends and covers the outer periphery of the portion of the piston rod 20 that does not extend into the oil reservoir 10.

[0062] This embodiment also provides a vehicle including a rear suspension system and a nitrogen shock absorber for the rear suspension provided by any of the above-described solutions, wherein the nitrogen shock absorber for the rear suspension is mounted on the rear suspension system. This vehicle possesses all the beneficial effects of the aforementioned nitrogen shock absorber for the rear suspension, which will not be elaborated upon here.

[0063] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rear suspension nitrogen shock absorber, characterized in that, The rear suspension nitrogen shock absorber, mounted on the vehicle's rear suspension system, includes: An oil storage cylinder (10) and a nitrogen cylinder (50) are provided. The inner cavity of the oil storage cylinder (10) is filled with oil. The nitrogen cylinder (50) is located on one side of the oil storage cylinder (10). The inner cavity of the nitrogen cylinder (50) is provided with a nitrogen chamber (501) and an oil chamber (502). The nitrogen chamber (501) is filled with nitrogen, and the oil chamber (502) is connected to the oil storage cylinder (10). The piston rod (20) is slidably connected at one end to the inner cavity of the oil reservoir (10); The main piston valve system (30) is located in the inner cavity of the oil reservoir (10) and connected to one end of the piston rod (20). The main piston valve system (30) divides the inner cavity of the oil reservoir (10) into a first chamber (101) and a second chamber (102). The first chamber (101) is connected to the oil chamber (502). A sealing assembly (40) is disposed on the inner wall of the oil reservoir (10) and is slidably connected to the piston rod (20). The sealing assembly (40) includes a dustproof sealing group (41) and an oil seal group (42) arranged sequentially from the outside to the inside along the axial direction of the oil reservoir (10). The oil seal group (42) includes a first oil seal (421) and a second oil seal (422) arranged sequentially from the outside to the inside along the axial direction of the oil reservoir (10). The first oil seal (421) and the second oil seal (422) are both interference-fitted with the outer wall of the piston rod (20). The second oil seal (422) is a heat-resistant oil seal.

2. The rear suspension nitrogen shock absorber according to claim 1, characterized in that, The first oil seal (421) is a hydrogenated nitrile rubber oil seal structure.

3. The rear suspension nitrogen shock absorber according to claim 1, characterized in that, The second oil seal (422) includes an integrally formed first oil seal part and a second oil seal part, wherein the first oil seal part is a fluororubber oil seal structure and the second oil seal part is a polytetrafluoroethylene oil seal structure.

4. The rear suspension nitrogen shock absorber according to claim 1, characterized in that, The dustproof sealing assembly (41) includes: The first dustproof seal (411) is disposed on one side of the oil seal assembly (42). The first dustproof seal (411) includes two spaced-apart first dustproof lips. The first dustproof lips are interference-fitted with the outer wall of the piston rod (20) to prevent dust from entering the inner cavity of the oil reservoir (10). The second dust seal (412) is disposed on the side of the first dust seal (411) away from the oil seal assembly (42). The second dust seal (412) includes a second dust lip, which is press-fitted with the outer wall of the piston rod (20) to prevent dust from entering the inner cavity of the oil reservoir (10).

5. The rear suspension nitrogen shock absorber according to claim 1, characterized in that, It also includes a floating piston assembly (60), which is slidably connected to the inner cavity of the nitrogen cylinder (50) and divides the inner cavity of the nitrogen cylinder (50) into the nitrogen chamber (501) and the oil chamber (502).

6. The rear suspension nitrogen shock absorber according to claim 5, characterized in that, It also includes a compression regulating valve (100), which is disposed between the oil chamber (502) and the first chamber (101) and is used to regulate the oil flow rate.

7. The rear suspension nitrogen shock absorber according to any one of claims 1-6, characterized in that, It also includes a first connecting seat (110) and a second connecting seat (120). The first connecting seat (110) is located at the end of the oil reservoir (10) away from the piston rod (20), and the second connecting seat (120) is located at the end of the piston rod (20) away from the oil reservoir (10). The first connecting seat (110) and the second connecting seat (120) are respectively used for external connection.

8. The rear suspension nitrogen shock absorber according to claim 7, characterized in that, The first connecting seat (110) has a knurled screw (111) pressed into the lug, which is used to fix the connection with the external structure.

9. The rear suspension nitrogen shock absorber according to claim 7, characterized in that, It also includes a protective component (150), one end of which is fixedly connected to the second connecting seat (120), and the other end extends and covers the outer periphery of the portion of the piston rod (20) that does not extend into the oil reservoir (10).

10. A vehicle, characterized in that, The system includes a rear suspension system and a rear suspension nitrogen shock absorber as described in any one of claims 1-9, wherein the rear suspension nitrogen shock absorber is disposed on the rear suspension system.

Images