Active suspension leveling air spring device

Abstract

The application belongs to the technical field of mechanical damping, and particularly relates to an active suspension leveling air spring device, which comprises an outer tube assembly with a first central shaft, a floating assembly slidingly arranged in the outer tube assembly along the first central shaft, and an outer bottom surface of the floating assembly and an inner bottom surface of the outer tube assembly forming a variable-volume hydraulic chamber. Through the floating assembly and the outer tube assembly, the damping piston is always passively kept in the optimal fluid mechanics neutral position designed inside the floating working cylinder under any inflation height and load working condition, the asymmetric deterioration of damping characteristics and the risk of piston rod collision caused by the compression of the traditional air spring suspension after the substantial lifting of the vehicle body height are eliminated, and the vehicle is ensured to have bidirectional equal effective damping stroke in the all-terrain mode.

Description

Technical Field

[0001] This invention belongs to the field of mechanical vibration reduction technology, specifically an active suspension leveling air spring device. Background Technology

[0002] In active suspension systems, air spring units typically consist of air spring airbags and coaxially mounted hydraulic shock absorbers, widely used for vehicle damping and ride height adjustment. They primarily operate by an electronic control unit that controls an air pump or distribution valve to inflate or deflate the airbag, thereby altering the internal pressure to support different vehicle loads or raising the vehicle's chassis height to adapt to complex road conditions. This structure utilizes the compressibility of air to achieve nonlinear stiffness characteristics, improving vehicle ride comfort and handling stability to a certain extent.

[0003] In existing integrated air spring shock absorbers, the piston connecting rod moves directly with changes in vehicle height. When the vehicle needs to significantly increase its height by inflating due to increased load or terrain requirements, the piston inside the shock absorber is forcibly pulled up and remains in the upper region of the hydraulic cylinder for an extended period. This causes the piston to deviate from its optimal neutral damping position. This deviation directly results in an extreme asymmetry in the effective working distance of the shock absorber during the recovery and compression strokes. When the vehicle vibrates over uneven road surfaces, due to insufficient effective travel on one side, the piston will rigidly collide with the end of the cylinder. This not only affects the comfort of passengers but also leads to premature fatigue damage to the internal sealing structure and valve system of the shock absorber, posing a safety hazard. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies and solve the problem of extreme asymmetry in the effective working distance of the shock absorber in the recovery and compression strokes caused by deviation, this invention proposes an active suspension leveling air spring device.

[0005] The technical solution adopted by this invention to solve its technical problem is: an active suspension leveling air spring device according to this invention, comprising:

[0006] An outer tube assembly having a first central axis;

[0007] A floating component is slidably disposed within the outer tube assembly along the first central axis, and the outer bottom surface of the floating component and the inner bottom surface of the outer tube assembly form a hydraulic cavity with variable volume.

[0008] The drive assembly includes a piston rod and a shock-absorbing piston assembly disposed at its end, the shock-absorbing piston assembly being slidably disposed within the floating assembly and capable of reciprocating relative to the floating assembly along the first central axis direction;

[0009] An air suspension assembly is connected between the outer tube assembly and the piston rod;

[0010] The fluid filling and discharging in the hydraulic chamber drives the floating assembly to move along the first central axis, thereby changing the relative position of the shock-absorbing piston assembly within the floating assembly along the first central axis.

[0011] Preferably, the floating component includes:

[0012] The floating component has a hollow cylindrical structure.

[0013] The bottom valve assembly is rigidly fixed to the bottom opening of the floating component; the lower surface of the bottom valve assembly forms the outer bottom surface of the floating component and directly receives the fluid pressure in the hydraulic chamber.

[0014] Preferably, the bottom valve assembly includes:

[0015] A bottom cover is sealed to the bottom end of the floating component, and its bottom wall seals the top surface of the hydraulic chamber.

[0016] A valve body seat is located above the bottom cover; a fluid channel is formed between the bottom cover and the valve body seat, and the fluid channel connects the internal space of the floating component and the annular gap between the outer wall of the floating component and the inner wall of the outer tube assembly.

[0017] Preferably, the outer tube assembly includes:

[0018] The liquid storage component has a bottom-closed cylindrical structure;

[0019] A sealing ring is located on the lower part of the inner wall of the liquid storage component and makes sliding sealing contact with the lower part of the outer wall of the floating component;

[0020] A guide cap is fixed to the top opening of the liquid storage component and slides in engagement with the upper part of the outer wall of the floating component.

[0021] Preferably, the outer circumferential surface of the floating component is provided with multiple guide grooves; the guide grooves are distributed in the middle region of the outer surface of the floating component, and the upper and lower regions of the outer surface of the floating component are respectively retained as smooth cylindrical surfaces; the guide grooves extend in a spiral shape.

[0022] Preferably, the floating component is further provided with a drainage hole penetrating its wall, the drainage hole being a micron-level throttling channel; one end of the drainage hole opens into the hydraulic chamber, and the other end opens into the gap region between the outer wall of the floating component and the inner wall of the liquid storage component.

[0023] Preferably, the shock-absorbing piston assembly divides the internal space of the floating component into an upper working chamber and a lower working chamber;

[0024] The shock-absorbing piston assembly includes:

[0025] The recovery damping valve system is located on the side of the shock-absorbing piston assembly facing the upper working chamber;

[0026] A compression flow valve system is located on the side of the shock-absorbing piston assembly facing the lower working chamber;

[0027] The outer periphery of the shock-absorbing piston assembly is provided with a dynamic sealing strip that mates with the inner wall of the floating component.

[0028] Preferably, the floating assembly further includes a protection valve; the protection valve includes an elastic sealing element that closes the pressure relief channel connecting the hydraulic chamber to the external low-pressure area of ​​the floating assembly.

[0029] Preferably, the air suspension assembly includes:

[0030] The airbag cover is rigidly connected to the top of the piston rod;

[0031] A flexible airbag, one end of which is sealed to the upper cover of the airbag, and the other end of which is sealed to the upper extension structure of the outer tube assembly or the floating assembly, forming the air chamber.

[0032] Preferably, the bottom outer wall of the outer tube assembly is provided with a mounting seat for connecting the unsprung mass of the vehicle; the medium in the hydraulic chamber is physically isolated from the medium inside the floating assembly through the bottom wall of the floating assembly.

[0033] The beneficial effects of this invention are as follows:

[0034] The active suspension leveling air spring device described in this invention decouples the air suspension vehicle height adjustment function from the physical structure of the damper's internal damping stroke through a floating component and an outer tube component. Utilizing the volumetric displacement effect of incompressible fluid, the floating component actively tracks the displacement of the damper piston along the first central axis, ensuring that the damper piston remains passively held in the optimal hydrodynamic neutral position within the floating working cylinder under any inflation height and load conditions. This eliminates the asymmetric deterioration of damping characteristics and the risk of piston rod impact caused by the compression of the recovery stroke after a significant increase in vehicle height in traditional air spring suspensions. It ensures that the vehicle has a bidirectional, equally effective damping stroke in all terrain modes. The fluid column enclosed in the hydraulic chamber provides a rigid, backlash-free reaction base for the follow-up bottom valve assembly during driving, guaranteeing the stability and consistency of the damping valve system's frequency response. Attached Figure Description

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] Figure 1 This is a three-dimensional schematic diagram of the internal structure of the present invention;

[0037] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0038] Figure 3 This is an exploded view of the outer tube assembly structure of the present invention;

[0039] Figure 4 This is a bottom view of the floating component structure of the present invention;

[0040] Figure 5 This is an exploded view of the floating component structure of the present invention;

[0041] Figure 6 This is an exploded view of the bottom valve assembly structure of the present invention;

[0042] Figure 7 This is a schematic diagram of the drainage hole structure of the present invention;

[0043] Figure 8 This is a schematic diagram of the hydraulic cavity structure of the present invention;

[0044] Figure 9 This is an exploded view of the drive component structure of the present invention;

[0045] Figure 10 This is an exploded view of the shock-absorbing piston assembly structure of the present invention;

[0046] Figure 11 This is a schematic diagram of the upper and lower working cavity structure of the present invention;

[0047] Figure 12 This is a three-dimensional schematic diagram of the air suspension component structure of the present invention;

[0048] Figure 13 This is an exploded view of the air suspension assembly structure of the present invention;

[0049] Figure 14 This is a schematic diagram of the air chamber structure of the present invention.

[0050] In the picture:

[0051] 100. Outer tube assembly; 110. Liquid reservoir; 120. Sealing ring; 130. Guide cap; 200. Floating assembly; 210. Floating component; 211. Flow guide groove; 212. Drain hole; 220. Bottom valve assembly; 221. Bottom cover; 230. Protective valve; 240. Hydraulic chamber; 300. Drive assembly; 310. Piston rod; 320. Shock absorber piston assembly; 321. Rebound damping valve system; 322. Compression flow valve system; 330. Upper working chamber; 340. Lower working chamber; 400. Air suspension assembly; 410. Airbag top cover; 420. Flexible airbag; 430. Air chamber. Detailed Implementation

[0052] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0053] like Figure 1 As shown, this embodiment discloses an active suspension leveling air spring device, including an outer tube assembly 100, a floating assembly 200, a drive assembly 300, and an air suspension assembly 400.

[0054] The first feature of this invention is that, through a nested multi-layer cylinder structure, the physical structure of the vehicle height adjustment function and the damping generation mechanism of the shock absorber is decoupled. A movable rigid base is established below the shock absorber assembly using the bottom hydraulic medium, so that the shock absorber piston can always be passively maintained at the optimal hydrodynamic neutral point designed inside the floating working cylinder under any inflation height and any load condition, completely eliminating the risk of insufficient recovery stroke and piston hitting the top caused by vehicle body lifting.

[0055] The structure of feature one of the present invention is as follows: Figure 3 As shown, the outer tube assembly 100 serves as the stator base of the device, with its geometric center defining a first central axis extending vertically. Its liquid reservoir 110 is a rigid cylindrical shape, closed at the bottom and open at the top. The bottom sidewall of the liquid reservoir 110 is provided with a medium interface for bidirectional communication with an external hydraulic source. A lower dynamic sealing ring 120 is embedded in the lower part of the inner wall of the liquid reservoir 110. Figure 4 As shown, the floating component 200, acting as the moving part of the device, is slidably inserted into the inner cavity of the liquid storage component 110 along the first central axis. The lower part of the outer wall of the floating component 200 maintains a sliding seal with the lower dynamic sealing ring 120, and the upper part of the outer wall of the floating component 200 maintains a sliding seal with the guide cover 130 fixed to the top of the liquid storage component 110. Figure 5 As shown, the bottom valve assembly 220 is rigidly fixed to the bottom opening of the floating member 210, as... Figure 6 As shown, the bottom valve assembly 220 includes a bottom cover 221, the outer periphery of which mates with a sealing ring 120, as... Figure 8 As shown, the bottom surface of the bottom cover 221 is a pressure-bearing surface, which, together with the inner bottom wall of the liquid reservoir 110, forms a hydraulic cavity 240 with variable volume, as shown. Figure 9 As shown, the drive assembly 300 includes a piston rod 310 and a shock-absorbing piston assembly 320, as... Figure 10 and Figure 11As shown, the upper end face of the shock-absorbing piston assembly 320 is provided with a restoring damping valve system 321 that controls the inner ring channel, and the lower end face is provided with a compression flow valve system 322 that controls the outer ring channel. The restoring damping valve system 321 is composed of multiple stacked elastic throttling valve plates, and the compression flow valve system 322 is composed of a one-way valve plate and a spring. The shock-absorbing piston assembly 320 is slidably disposed in the internal working chamber of the floating component 200, and divides the internal space into an upper working chamber 330 and a lower working chamber 340. The air suspension assembly 400 is connected between the outer tube assembly 100 and the piston rod 310.

[0056] The working principle of feature one of the present invention is as follows: Figure 1 As shown, when the air suspension assembly 400 inflates and lifts the vehicle body, as... Figure 11 As shown, the piston rod 310 drives the shock-absorbing piston assembly 320 to move upward relative to the outer tube assembly 100, causing the shock-absorbing piston assembly 320 to deviate from the axial center position of the floating assembly 200, such as... Figure 8 As shown, at this time, an external hydraulic source injects incompressible fluid into the hydraulic chamber 240 via a medium interface. The fluid pressure acts on the bottom surface of the bottom cover 221 and generates an upward thrust, driving the entire floating assembly 200 to overcome friction and move relative to the reservoir 110 along the first central axis. By controlling the volume of fluid injected into the hydraulic chamber 240, the displacement distance of the floating assembly 200 along the first central axis is matched with the lifting height of the vehicle body, thereby forcing the floating assembly 200 to follow the shock absorber piston assembly 320 along the first central axis until the shock absorber piston assembly 320 is once again located inside the floating assembly 200 along the first central axis. At the fluid dynamic neutral point, during vehicle operation, the fluid enclosed in the hydraulic chamber 240 forms a rigid hydraulic column, providing a stable support base for the bottom valve assembly 220, ensuring the normal functioning of the shock absorption damping. During vehicle operation, the piston rod 310 drives the shock absorption piston assembly 320 to reciprocate at high frequency along the first central axis. During the recovery stroke, the high-pressure oil opens the recovery damping valve system 321 to generate recovery damping. During the compression stroke, the oil pushes open the compression flow valve system 322 and generates compression damping by the bottom valve assembly 220. At this time, the hydraulic column enclosed in the hydraulic chamber 240 provides rigid support for the floating component 200, ensuring the stability of the damping.

[0057] The second feature of this invention is that it can forcibly establish a high-load-bearing liquid lubricating film between the sliding interface of the floating component and the outer tube component, transforming the traditional metal-solid contact friction into shear friction inside the fluid, and using the load-sensitive characteristics of the leveling pressure to realize the automatic adjustment of the lubricating oil film pressure, thereby effectively preventing the mechanical structure from jamming and wearing when dealing with the huge lateral shear force caused by the vehicle's cornering roll or suspension geometric deformation.

[0058] The structure of feature two of this invention is as follows: Figure 7 As shown, a drainage hole 212 is machined in the lower wall of the floating component 210 of the floating assembly 200 or the side wall of the bottom valve assembly 220. The drainage hole 212 is a micron-level throttling channel. The inlet end of the drainage hole 212 penetrates the bottom surface of the bottom cover 221 and is directly connected to the high-pressure hydraulic chamber 240. The outlet end of the drainage hole 212 penetrates the outer wall of the floating component 210. The axial position of the outlet end of the drainage hole 212 is set above and adjacent to the lower dynamic sealing ring 120. A radial gap is left between the outer wall of the floating component 210 and the inner wall of the liquid storage component 110. This gap forms an annular oil storage chamber.

[0059] The working principle of feature two of this invention is as follows: Figure 8 As shown, when high-pressure fluid is filled into the hydraulic chamber 240 to support the floating assembly 200 and the vehicle body load, as Figure 7 As shown, a portion of the high-pressure fluid is pressurized and enters the drainage hole 212. When the fluid flows through the fine drainage hole 212, it undergoes throttling and pressure reduction, and seeps out from the outlet end into the fitting gap between the floating component 210 and the liquid storage component 110. The seeping fluid forces the formation of a hydrostatic lubricating oil film with a certain load-bearing capacity between the outer wall of the floating component 210 and the inner wall of the liquid storage component 110. When the vehicle turns or tilts, causing the floating component 200 to be subjected to lateral shear force, this hydrostatic lubricating oil film converts the dry friction between metals into internal friction in the liquid, significantly reducing the coefficient of friction and preventing the floating component 200 from mechanically seizing or creeping during axial adjustment.

[0060] The third feature of this invention is specifically manifested as follows: using the axial displacement of the floating component during the leveling process and the annular gap fluid fluctuation caused by vehicle driving bumps as a power source, the flow pattern of the fluid in the gap between the double-layer pipe walls is changed through a specific surface texture structure, the laminar thermal boundary layer attached to the metal wall is destroyed and a spiral turbulent vortex is induced, thereby improving the heat exchange coefficient of internal damping heat conduction to the outer pipe wall.

[0061] The structure of feature three of this invention is as follows: Figure 4 and Figure 5 As shown, a guide groove 211 is formed on the outer circumferential surface of the floating component 210 in the floating assembly 200 by machining. The guide groove 211 is a spiral groove with a preset depth and width. Its spiral angle is set according to the fluid viscosity. The guide groove 211 is distributed in the middle region of the outer surface of the floating component 210. The upper and lower regions of the outer surface of the floating component 210 are respectively retained as smooth cylindrical surfaces to cooperate with the guide cover 130 and the lower dynamic sealing ring 120. The space where the guide groove 211 is located is in the annular oil storage cavity between the floating component 210 and the liquid storage component 110. The annular oil storage cavity is filled with thermally conductive damping oil.

[0062] The working principle of feature three of this invention is as follows: Figure 1As shown, while the vehicle's movement causes the shock absorber piston assembly 320 to reciprocate, generating damping heat, as... Figure 5 As shown, or when the floating component 200 is leveling, the floating component 210 undergoes axial displacement relative to the liquid storage component 110. The oil in the annular oil storage cavity moves with the floating component 210 under the action of viscous force. The spiral structure of the guide groove 211 forces the axially flowing oil to undergo tangential deflection, thereby inducing a spiral turbulent vortex in the annular gap. This turbulent vortex destroys the laminar boundary layer attached to the outer wall of the floating component 210 and the inner wall of the liquid storage component 110, enhances the radial mixing of the fluid, accelerates the transfer of damping heat generated inside the floating component 210 to the metal wall of the liquid storage component 110, and finally dissipates it to the external environment, thus avoiding the reduction of damping performance of the internal oil due to thermal decay.

[0063] The fourth feature of this invention is specifically manifested in that: when the device faces a drop impact or hard impact from the road surface that exceeds the design limit, it can instantly respond to the pressure change and convert the leveling hydraulic chamber into a two-stage hydraulic buffer with energy absorption characteristics. Through controlled fluid throttling and overflow, it dissipates huge impact kinetic energy, thereby protecting the outer tube base and internal precision valve system from rigid collision damage under extreme working conditions where the physical stroke is exhausted.

[0064] The structure of feature four of this invention is as follows: Figure 4 and Figure 5 As shown, a protective valve 230 is integrated at the bottom end of the floating assembly 200. The protective valve 230 is disposed in the side wall channel of the bottom cover 221 of the bottom valve assembly 220, as shown. Figure 7 As shown, the protection valve 230 includes a spring-loaded steel ball valve core or a cone valve core. The oil inlet side of the protection valve 230 is in fluid communication with the hydraulic chamber 240 at the bottom, and the oil outlet side of the protection valve 230 is in fluid communication with the annular oil storage chamber on the side of the floating member 210. The opening pressure threshold of the protection valve 230 is set to be higher than the maximum working pressure under normal leveling conditions.

[0065] The working principle of feature four of this invention is as follows: Figure 7 and Figure 8 As shown, when a vehicle experiences a violent fall or the suspension is subjected to an instantaneous impact load exceeding its design limits, the fluid pressure in the hydraulic chamber 240 will instantly and rapidly increase and exceed the opening pressure threshold of the protection valve 230. At this time, the protection valve 230 will open rapidly, allowing the high-pressure fluid in the hydraulic chamber 240 to overflow and release pressure into the low-pressure annular oil reservoir. This pressure release process absorbs a huge amount of impact energy, allowing the floating component 200 to produce a controlled downward displacement under extreme force, thereby forming a hydraulic buffer effect and preventing the bottom structure or sealing component of the reservoir 110 from mechanical damage caused by rigid impact due to overload pressure.

[0066] The fifth feature of this invention is specifically manifested in the following ways: an air spring is used as the main static load support for the vehicle body and the height adjustment execution unit, while an internal hydraulic system is used to provide dynamic damping and stroke compensation. The two are coaxially integrated in structure and synergistically complementary in function through a shared piston rod and outer tube base.

[0067] The structure of feature five of this invention is as follows: Figure 1 As shown, the air suspension assembly 400 is arranged around the first central axis on the upper exterior of the outer tube assembly 100 and the piston rod 310. The airbag cover 410 is rigidly locked to the threaded end of the piston rod 310 and serves as a mounting interface on the vehicle body side. Figure 12 and Figure 13 As shown, the flexible airbag 420 has a foldable or rollable cylindrical structure. Its upper edge is sealed and pressed against the outer edge of the airbag cover 410, and its lower edge is sealed and fixed to the outer wall of the guide cover 130 of the outer tube assembly 100 or the upper outer wall of the liquid reservoir 110 by a clamping ring. Figure 14 As shown, the top outer surface of the airbag cover 410, the flexible airbag 420, and the outer tube assembly 100 together form a sealed air chamber 430. The airbag cover 410 is provided with a control nozzle that communicates with the air chamber 430, which is used to connect an external air source and a solenoid valve assembly.

[0068] The working principle of feature five of this invention is as follows: In the working state, compressed air is injected into the air chamber 430 through the airbag cover 410. The air pressure built up inside the air chamber 430 acts on the inner surface of the airbag cover 410, generating an upward lifting force to support the sprung mass of the vehicle. When the air chamber 430 is inflated, the flexible airbag 420 unfolds, pushing the piston rod 310 to move upward relative to the outer tube assembly 100, thereby increasing the vehicle height. At this time, the floating assembly 200 described in feature one moves upward synchronously under the drive of the bottom hydraulic chamber 240, so that the shock-absorbing piston assembly 320 buried deep inside the device will not hit the top of the floating assembly 200 due to the stretching of the airbag, ensuring that the hydraulic shock absorption system is always within the effective stroke range throughout the entire stroke range of the airbag.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An active suspension leveling air spring device, characterized in that, include: The outer tube assembly (100) has a first central axis and includes a liquid reservoir (110) having a bottom-closed cylindrical structure; A floating assembly (200) is slidably disposed within the outer tube assembly (100) along the first central axis. The floating assembly (200) includes a floating element (210) and a bottom valve assembly (220). The floating element (210) has a hollow cylindrical structure. The bottom valve assembly (220) is rigidly fixed to the bottom opening of the floating element (210). The outer bottom surface of the floating assembly (200) and the inner bottom surface of the outer tube assembly (100) form a hydraulic cavity (240) with a variable volume. The lower surface of the bottom valve assembly (220) constitutes the outer bottom surface of the floating assembly (200) and directly receives the fluid pressure in the hydraulic cavity (240). The floating component (200) is also provided with a drainage hole (212) penetrating its wall, the drainage hole (212) being a micron-level throttling channel; one end of the drainage hole (212) opens into the hydraulic chamber (240), and the other end opens into the gap area between the outer wall of the floating component (210) and the inner wall of the liquid storage component (110); The drive assembly (300) includes a piston rod (310) and a shock-absorbing piston assembly (320) disposed at its end. The shock-absorbing piston assembly (320) is slidably disposed within the floating assembly (200) and is capable of reciprocating relative to the floating assembly (200) along the first central axis direction. An air suspension assembly (400) is connected between the outer tube assembly (100) and the piston rod (310); The hydraulic chamber (240) fills and discharges fluid to drive the floating assembly (200) to move along the first central axis, thereby changing the relative position of the shock-absorbing piston assembly (320) within the floating assembly (200) along the first central axis.

2. The active suspension leveling air spring device according to claim 1, characterized in that, The bottom valve assembly (220) includes: The bottom cover (221) is sealed to the bottom end of the floating member (210), and its bottom wall closes the top surface of the hydraulic chamber (240); A valve body seat is located above the bottom cover (221); a fluid channel is formed between the bottom cover (221) and the valve body seat, and the fluid channel connects the internal space of the floating part (210) and the annular gap between the outer wall of the floating part (210) and the inner wall of the outer tube assembly (100).

3. The active suspension leveling air spring device according to claim 2, characterized in that, The outer tube assembly (100) also includes: A sealing ring (120) is disposed on the lower part of the inner wall of the liquid storage component (110) and slides in sealing contact with the lower part of the outer wall of the floating component (210); The guide cap (130) is fixed to the top opening of the liquid storage component (110) and slides in cooperation with the upper part of the outer wall of the floating component (210).

4. The active suspension leveling air spring device according to claim 3, characterized in that, The outer circumferential surface of the floating component (210) is provided with multiple guide grooves (211); the guide grooves (211) are distributed in the middle region of the outer surface of the floating component (210), and the upper and lower regions of the outer surface of the floating component (210) are respectively retained as smooth cylindrical surfaces; the guide grooves (211) extend in a spiral shape.

5. The active suspension leveling air spring device according to claim 1, characterized in that, The shock-absorbing piston assembly (320) divides the internal space of the floating assembly (200) into an upper working chamber (330) and a lower working chamber (340). The shock-absorbing piston assembly (320) includes: A recovery damping valve system (321) is provided on the side of the shock-absorbing piston assembly (320) facing the upper working chamber (330); A compression flow valve system (322) is provided on the side of the shock-absorbing piston assembly (320) facing the lower working chamber (340); The outer periphery of the shock-absorbing piston assembly (320) is provided with a dynamic sealing strip that cooperates with the inner wall of the floating component (200).

6. The active suspension leveling air spring device according to claim 1, characterized in that, The floating assembly (200) also includes a protection valve (230); the protection valve (230) includes an elastic sealing element that closes the pressure relief channel connecting the hydraulic chamber (240) and the external low-pressure area of ​​the floating assembly (200).

7. The active suspension leveling air spring device according to claim 1, characterized in that, The air suspension assembly (400) includes: The airbag cover (410) is rigidly connected to the top of the piston rod (310); A flexible airbag (420) has one end sealed to the airbag cover (410) and the other end sealed to the upper extension structure of the outer tube assembly (100) or the floating assembly (200), forming an air chamber (430).

8. The active suspension leveling air spring device according to claim 1, characterized in that, The bottom outer wall of the outer tube assembly (100) is provided with a mounting seat for connecting the unsprung mass of the vehicle; the medium in the hydraulic chamber (240) and the medium inside the floating assembly (200) are physically isolated through the bottom wall of the floating assembly (200).

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