Hydraulic suspension system and vehicle having the same

Abstract

The hydraulic suspension system (1000) includes a plurality of height adjustment devices provided in one-to-one correspondence with a plurality of wheels, and a central control device (24). The central control device (24) includes a housing (240) and a moving member (241). The moving member (241) is provided movably within the housing (240) and divides the housing (240) into a first region and a second region in a moving direction. The first region includes a first chamber (243) and a second chamber (244) that are isolated from each other and communicate with the height adjustment devices, respectively. The second region includes a third chamber (245) and a fourth chamber (246) that are isolated from each other and communicate with the height adjustment devices, respectively. The wheels corresponding to the first chamber 243 and the second chamber 244 are located diagonally, and the wheels corresponding to the third chamber 245 and the fourth chamber 246 are also located diagonally. This system is more useful for improving the handling stability of the vehicle.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application is based on and claims priority to a Chinese patent application having application number 202111652021.8, filed on December 30, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of vehicles, and in particular to hydraulic suspension systems and vehicles having the same. [Background technology]

[0003] The suspension system plays a very important role in the safety and stability of a vehicle, but there is a contradictory relationship between the comfort and driving stability of the vehicle and the requirements for the suspension characteristics of the vehicle. Current suspension system designs often provide high comfort at the expense of a certain level of driving stability. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application aims to solve at least to some extent one of the technical problems in the related art.

[0005] Therefore, one object of the present application is to provide a hydraulic suspension system that helps improve the handling stability of a vehicle.

[0006] The present application further provides a vehicle having the above hydraulic suspension system. [Means for solving the problem]

[0007] A hydraulic suspension system according to an embodiment of the present application includes a plurality of height adjustment devices and a central control device, the plurality of height adjustment devices being arranged in one-to-one correspondence with a plurality of wheels of a vehicle, the central control device including a housing and a movable member, the movable member being movably arranged within the housing and dividing the housing into a first region and a second region in a moving direction of the movable member, the first region including a first chamber and a second chamber isolated from each other, the second region including a third chamber and a fourth chamber isolated from each other, the first chamber, the second chamber, the third chamber and the fourth chamber being in one-to-one correspondence with the plurality of height adjustment devices, the wheels corresponding to the height adjustment devices in communication with the first chamber and the second chamber being located diagonally, and the wheels corresponding to the height adjustment devices in communication with the third chamber and the fourth chamber being also located diagonally.

[0008] In the hydraulic suspension system according to the embodiment of the present application, when a single wheel of a vehicle encounters an obstacle, the height of the single wheel rises, so that the medium in the height adjustment device corresponding to the single wheel flows into the central control device to move the moving member, and thus the medium flows into the height adjustment device corresponding to the other diagonal wheels, thereby lowering the height of the other diagonal wheels, lengthening the time for the other diagonal wheels to leave the ground, increasing the difficulty of leaving the ground, and improving the driving stability of the vehicle.

[0009] In some embodiments of the present application, the volume change of the first chamber and the second chamber in the first region is opposite to the volume change of the third chamber and the fourth chamber in the second region.

[0010] In some embodiments of the present application, the first chamber, the second chamber, the third chamber and the fourth chamber are provided in sequence along the moving direction of the moving member.

[0011] In some embodiments of the present application, initially, the first chamber and the fourth chamber have the same volume, and the second chamber and the third chamber have the same volume.

[0012] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device is in communication with the first chamber and the third chamber, and the other of the front axle height adjustment device and the rear axle height adjustment device is in communication with the second chamber and the fourth chamber.

[0013] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device is in communication with the first chamber and the fourth chamber, and the other of the front axle height adjustment device and the rear axle height adjustment device is in communication with the second chamber and the third chamber.

[0014] In some embodiments of the present application, the central control device is provided with a first connection port, the height adjustment device includes a reservoir and a damper, the damper is provided corresponding to a wheel, the reservoir supplies oil to the damper, the first connection port is connected to the damper, the first connection port is provided in plurality and includes a first port, a second port, a third port and a fourth port, the first port, the second port, the third port and the fourth port are connected to the first chamber, the second chamber, the third chamber and the fourth chamber, respectively.

[0015] In some embodiments of the present application, the central control device further includes a second connection port, the second connection port being configured to communicate with the reservoir, the second connection port being provided in plurality and including a fifth port, a sixth port, a seventh port and an eighth port, the fifth port, the sixth port, the seventh port and the eighth port being communicated with the first chamber, the second chamber, the third chamber and the fourth chamber, respectively.

[0016] In some embodiments of the present application, an axis of the first connection port is disposed perpendicular to an axis of the second connection port.

[0017] In some embodiments of the present application, the hydraulic suspension system further includes a first control valve, a second control valve, a third control valve, and a fourth control valve, wherein the first control valve is provided between the fifth port and the reservoir, the second control valve is provided between the sixth port and the reservoir, the third control valve is provided between the seventh port and the reservoir, and the fourth control valve is provided between the eighth port and the reservoir.

[0018] In some embodiments of the present application, a first connecting passage is provided between the first control valve and the fourth control valve, and a fifth control valve is provided in the first connecting passage, a second connecting passage is provided between the second control valve and the third control valve, and a sixth control valve is provided in the second connecting passage.

[0019] In some embodiments of the present application, the movable member includes a first part, a second part, and a third part, the first part moving axially along a side wall of the housing to divide the housing into the first region and the second region, the second part connected to one side of the first part and moving along the side wall of the housing to divide the first region into the first chamber and the second chamber, and the third part connected to the other side of the first part and moving along the side wall of the housing to divide the second region into the third chamber and the fourth chamber.

[0020] In some embodiments of the present application, the housing has a first cylindrical body, a second cylindrical body, and a third cylindrical body arranged in sequence along the moving direction of a moving member, an inner diameter of the second cylindrical body is larger than an inner diameter of the first cylindrical body and is also larger than an inner diameter of the third cylindrical body, the first chamber is formed between the second portion and an inner wall of the first cylindrical body, the first portion contacts the inner wall of the second cylindrical body to divide the second cylindrical body into the second chamber and the third chamber, and the fourth chamber is formed between the third portion and the inner wall of the third cylindrical body.

[0021] In some embodiments of the present application, the extension direction of the first portion is perpendicular to the extension direction of the second portion, and the extension direction of the second portion and the third portion are arranged symmetrically with respect to the first portion.

[0022] In some embodiments of the present application, a return spring is provided between the moving member and the end wall of the housing.

[0023] In some embodiments of the present application, the damper has a damper housing, a piston and a piston rod, the damper housing is configured to be connected to a wheel, the piston is located within the damper housing and cooperates with the damper housing to define an upper chamber and a lower chamber, one end of the piston rod is connected to the piston, the piston rod is configured to be connected to a vehicle body, an oil passage is provided within the piston rod, the oil passage is connected to the lower chamber, and the reservoir supplies oil to the damper via the oil passage.

[0024] In some embodiments of the present application, the height adjustment device further includes a connecting passage and an accumulator module, the connecting passage communicating between the central control device and a corresponding damper;

[0025] The accumulator module includes a damping adjustment accumulator and an opening adjustment valve, the damping adjustment accumulator is connected between the damper and the central control device, and the opening adjustment valve is provided between the damping adjustment accumulator and the damper.

[0026] In some embodiments of the present application, the accumulator module further includes a stiffness adjustment accumulator and a stiffness adjustment valve, the connecting passage is provided with a stiffness adjustment connection point, the stiffness adjustment accumulator is in communication with the stiffness adjustment connection point, and the stiffness adjustment valve is provided between the stiffness adjustment accumulator and the stiffness adjustment connection point.

[0027] In some embodiments of the present application, the height adjustment device further includes a seventh control valve, and the seventh control valve is disposed between the stiffness adjustment connection point and the damping adjustment accumulator.

[0028] In some embodiments of the present application, the central control device is a cylinder structure.

[0029] A vehicle according to an embodiment of the present application includes the hydraulic suspension system described in the above embodiment of the present application.

[0030] In the vehicle according to the embodiment of the present application, when the vehicle has a tendency to roll, it can play a role in suppressing the roll. When the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the tilt width of the vehicle, thereby avoiding the roll of the vehicle.

[0031] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief description of the drawings]

[0032] [Figure 1] 1 is a schematic diagram of a hydraulic suspension system according to different embodiments of the present application; [Diagram 2]1 is a schematic diagram of a hydraulic suspension system according to different embodiments of the present application; [Diagram 3] 2 is a schematic diagram of a left front damper assembly and a right front damper assembly according to an embodiment of the present application. FIG. [Figure 4] FIG. 4 is a cross-sectional view of the damper assembly shown in FIG. [Diagram 5] FIG. 2 is a cross-sectional view of a central control device according to an embodiment of the present application. [Figure 6] FIG. 2 is a perspective view of a central control device according to an embodiment of the present application. [Figure 7] FIG. 1 is a schematic diagram of a metal bellows accumulator according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood to limit the present application.

[0034] Hereinafter, a hydraulic suspension system 1000 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. The hydraulic suspension system 1000 is used in a vehicle and connects an axle and a vehicle body of the vehicle.

[0035] As shown in Figs. 1 to 2 and 5, the hydraulic suspension system 1000 according to the embodiment of the present application includes a plurality of height adjustment devices and a central control device 24. The plurality of height adjustment devices are provided in one-to-one correspondence with the plurality of wheels of the vehicle, and each height adjustment device is connected to the vehicle body. Specifically, the plurality of height adjustment devices include a front axle height adjustment device and a rear axle height adjustment device, and the front axle height adjustment devices are provided corresponding to the left front wheel and the right front wheel, respectively, and the rear axle height adjustment devices are provided corresponding to the left rear wheel and the right rear wheel, respectively. In the description of the present application, for convenience of explanation, the height adjustment device corresponding to the left front wheel is referred to as the left front height adjustment device, the height adjustment device corresponding to the right front wheel is referred to as the right front height adjustment device, the height adjustment device corresponding to the left rear wheel is referred to as the left rear height adjustment device, and the height adjustment device corresponding to the right rear wheel is referred to as the right rear height adjustment device. The height adjustment devices according to the present application adjust the height of the vehicle, i.e., the relative distance between the wheels and the vehicle body.

[0036] The central control device 24 includes a housing 240 and a moving member 241. The moving member 241 is movably disposed in the housing 240 and divides the housing 240 into a first region and a second region in the moving direction of the moving member 241. The first region includes a first chamber 243 and a second chamber 244 that are isolated from each other, and the second region includes a third chamber 245 and a fourth chamber 246 that are isolated from each other. The first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246 are configured to be filled with a medium. In the present application, the medium is oil. In other embodiments, it may be other media, which is consistent with the medium in the height adjustment device.

[0037] Specifically, the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are all filled with oil, and when the amount of oil in the first region increases, a force is applied to the moving member 241 to move toward the second region, and when the amount of oil in the second region increases, a force is applied to the moving member 241 to move toward the first region. In some specific examples of the present application, the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are provided in order along the moving direction of the moving member 241. Of course, as can be understood, the arrangement order of the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 is not limited thereto, and it is only necessary to ensure that the first chamber 243 and the second chamber 244 are distributed in the first region, and the third chamber 245 and the fourth chamber 246 are distributed in the second region.

[0038] The first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246 are connected to a plurality of height adjustment devices in a one-to-one correspondence, and the wheels corresponding to the height adjustment devices connected to the first chamber 243 and the second chamber 244 are located diagonally, and the wheels corresponding to the height adjustment devices connected to the third chamber 245 and the fourth chamber 246 are also located diagonally.

[0039] Specifically, when the wheels corresponding to the height adjustment devices communicated with the first chamber 243 and the second chamber 244 are the left front wheel and the right rear wheel, the wheels corresponding to the height adjustment devices communicated with the third chamber 245 and the fourth chamber 246 may be the right front wheel and the left rear wheel. In this case, the first chamber 243 communicates with one of the left front height adjustment device and the right rear height adjustment device, and the second chamber 244 communicates with the other of the left front height adjustment device and the right rear height adjustment device. The third chamber 245 communicates with one of the right front height adjustment device and the left rear height adjustment device, and the fourth chamber 246 communicates with the other of the right front height adjustment device and the left rear height adjustment device.

[0040] When the wheels corresponding to the height adjustment devices communicated with the first chamber 243 and the second chamber 244 are the right front wheel and the left rear wheel, the wheels corresponding to the height adjustment devices communicated with the third chamber 245 and the fourth chamber 246 are the left front wheel and the right rear wheel. In this case, the first chamber 243 communicates with one of the right front height adjustment device and the left rear height adjustment device, and the second chamber 244 communicates with the other of the right front height adjustment device and the left rear height adjustment device. The third chamber 245 communicates with one of the left front height adjustment device and the right rear height adjustment device, and the fourth chamber 246 communicates with the other of the left front height adjustment device and the right rear height adjustment device.

[0041] In addition, if one chamber of the central control device 24 communicates with a corresponding height adjustment device, the oil may flow between the chamber and the height adjustment device. When the distance between the wheel and the corresponding vehicle body changes, the oil can flow into or out of the height adjustment device. In the embodiment of the present application, the central control device 24 is a cylinder structure.

[0042] When a single wheel of a vehicle encounters an obstacle, the height of the single wheel rises, so that the oil in the height adjustment device corresponding to the single wheel flows into the central control device to move the moving member, and thus the medium flows into the height adjustment device corresponding to the other diagonal wheels, thereby lowering the height of the other diagonal wheels, lengthening the time for the other diagonal wheels to leave the ground, increasing the difficulty of leaving the ground, and improving the driving stability of the vehicle.

[0043] For example, when the left front wheel encounters an obstacle, the left front wheel is lifted, and the center of gravity of the vehicle is lifted while the vehicle continues to run, which may cause the right front wheel and the left rear wheel to leave the ground, causing the vehicle to run out of control. In the present application, by providing a central control device, when the left front wheel encounters an obstacle, the oil in the left front height adjustment device flows into the first region, and the oil that has flowed into the first region acts on the moving member 241 to move the moving member 241 into the second region, and thus the oil in the second region is pushed out and flows into the right front height adjustment device and the left rear height adjustment device, increasing the distance between the right front wheel and the left rear wheel and the vehicle body, lowering the height of the right front wheel and the left rear wheel, reducing the risk of the right front wheel and the left rear wheel leaving the ground, and improving the steering stability of the vehicle.

[0044] On the other hand, when the vehicle has a tendency to roll, for example, when the left front wheel and the left rear wheel are lifted, the left front height adjustment device and the left rear height adjustment device flow into the first area and the second area, respectively, and the acting force on the moving member 241 in the first area and the acting force on the moving member 241 in the second area are opposite to each other, and the two opposing acting forces cancel each other out, so that the moving member 241 does not move, that is, the oil passage between the central control device 24 and the right front height adjustment device and the right rear height adjustment device does not flow, so that the right front height adjustment device and the right rear height adjustment device maintain their current height state, suppressing changes in the distance between the right front wheel and the vehicle body, and suppressing changes in the distance between the right rear wheel and the vehicle body, thereby suppressing roll.

[0045] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted and oil in the left front height adjustment device flows into one of the first area and the second area, allowing the moving member 241 to move, and oil in the other of the first area and the second area flows into the right front height adjustment device and the left rear height adjustment device, increasing the distance between the right front wheel and the left rear wheel and the vehicle body, thereby adjusting the height of the vehicle body to reduce the vehicle's tilt width and avoid vehicle roll.

[0046] Of course, it can be understood that the above several situations are only exemplary descriptions, and when the vehicle encounters other situations such as right front wheel lift, left rear wheel lift, etc., the oil will also flow according to the above interlocking principle to avoid the vehicle rolling, and each situation will not be described in detail here.

[0047] In the hydraulic suspension system 1000 according to the embodiment of the present application, the central control unit 24 and the multiple sets of height adjustment devices can suppress the roll when the vehicle has a tendency to roll. When the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the vehicle tilt width and prevent the vehicle from rolling.

[0048] In some embodiments of the present application, the volume change of the first chamber 243 and the second chamber 244 in the first region is opposite to the volume change of the third chamber 245 and the fourth chamber 246 in the second region. That is, when the volumes of the first chamber 243 and the second chamber 244 increase, the volumes of the third chamber 245 and the fourth chamber 246 decrease. Alternatively, when the volumes of the first chamber 243 and the second chamber 244 decrease, the volumes of the third chamber 245 and the fourth chamber 246 increase. This ensures reliable movement of the moving member 241 and ensures the roll suppression action by the central control device 24.

[0049] In some embodiments of the present application, in an initial state, the volumes of the first chamber 243 and the fourth chamber 246 are the same, and the volumes of the second chamber 244 and the third chamber 245 are the same, so that in an initial state, the moving member 241 is in a middle position and ensures that the response state to each height adjustment device is the same.

[0050] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device communicates with the first chamber 243 and the third chamber 245, and the other of the front axle height adjustment device and the rear axle height adjustment device communicates with the second chamber 244 and the fourth chamber 246. Specifically, an example will be described in which the left front height adjustment device communicates with the first chamber 243, the right front height adjustment device communicates with the third chamber 245, the left rear height adjustment device communicates with the fourth chamber 246, and the right rear height adjustment device communicates with the second chamber 244.

[0051] When the vehicle has a tendency to pitch, for example when the nose dive phenomenon of the vehicle occurs due to emergency braking, that is, when the distance between the front body of the vehicle and the wheel corresponding to the front axle height adjuster becomes small, the oil in the left front height adjuster and the right front height adjuster flows into the first chamber 243 and the third chamber 245 respectively, and the acting force on the moving member 241 in the first region and the acting force on the moving member 241 in the second region are opposite to each other, and the two opposing acting forces cancel each other out, so that the moving member 241 does not move, that is, the oil passage between the central control device 24 and the right rear height adjuster and the left rear height adjuster does not flow, so that the left rear height adjuster and the right rear height adjuster maintain their current height state, inhibit the change in the distance between the left rear wheel and the body, inhibit the change in the distance between the right rear wheel and the body, and thus achieve the function of inhibiting nose dive, that is, provide the vehicle with an anti-pitching function.

[0052] Of course, it will be understood that the above oil flow description is merely exemplary to introduce the anti-pitching principle, and that by utilizing the above anti-pitching principle, the hydraulic suspension system 1000 can provide an anti-pitching force when the vehicle squats due to sudden acceleration of the vehicle, or when there is a tendency for the vehicle to pitch in other situations.

[0053] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device communicates with the first chamber 243 and the fourth chamber 246, and the other of the front axle height adjustment device and the rear axle height adjustment device communicates with the second chamber 244 and the third chamber 245. Specifically, an example will be described in which the left front height adjustment device communicates with the first chamber 243, the right front height adjustment device communicates with the fourth chamber 246, the left rear height adjustment device communicates with the third chamber 245, and the right rear height adjustment device communicates with the second chamber 244.

[0054] When the vehicle has a tendency to roll, for example, when the distance between the left front wheel and the vehicle body becomes smaller and the distance between the left rear wheel and the vehicle body becomes smaller, the oil flowing out from the left front height adjustment device flows into the first chamber 243, and the oil flowing out from the left rear height adjustment device flows into the third chamber 245, that is, the acting force on the moving member 241 in the first region and the acting force on the moving member 241 in the second region are opposite to each other, and the two opposing acting forces cancel each other out, so that the moving member 241 does not move, that is, the oil passage between the central control device 24 and the right front height adjustment device and the right rear height adjustment device does not flow, so that the right front height adjustment device and the right rear height adjustment device maintain their current height state, suppress the change in the distance between the right front wheel and the vehicle body, and suppress the change in the distance between the right rear wheel and the vehicle body, thereby suppressing the roll.

[0055] Of course, it will be appreciated that the above oil flow description is merely exemplary to introduce the anti-roll principles, and that the above anti-roll principles can be utilized by the hydraulic suspension system 1000 to provide anti-roll forces when the vehicle encounters other roll situations.

[0056] In some embodiments of the present application, as shown in Figs. 1 to 2, 5 and 6, the central control device 24 is provided with a first connection port 2401, the height adjustment device includes a reservoir and a damper 200, the damper 200 is provided corresponding to the wheel, the reservoir supplies oil to the damper 200, and the first connection port 2401 communicates with the damper 200. A plurality of first connection ports 2401 are provided, and include a first port 24011, a second port 24012, a third port 24013 and a fourth port 24014, and the first port 24011, the second port 24012, the third port 24013 and the fourth port 24014 communicate with the first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246, respectively. By providing the first connection port 2401, communication between the multiple dampers 200 and the central control device 24 is realized, and communication between the different height adjustment devices and the central control device 24 is also realized.

[0057] 1 to 2, 5 and 6, the central control device 24 preferably further includes a second connection port 2402, which is configured to communicate with the reservoir. A plurality of second connection ports 2402 are provided, and include a fifth port 24021, a sixth port 24022, a seventh port 24023 and an eighth port 24024, which communicate with the first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246, respectively. As a result, the oil in the reservoir passes through the central control device 24 and then flows into the height adjustment device, thereby enabling height adjustment when the vehicle is in an unlevel state. When the vehicle is in an unlevel state, the state of each height adjustment device is different. At this time, the reservoir passes oil to each height adjustment device respectively via the central control device, and the movable member 241 automatically distributes the oil that has flowed into each height adjustment device. This eliminates the need for additional calculations of the amount of oil that needs to be passed through each height adjustment device depending on the state of the vehicle, making it simple and convenient.

[0058] 6, in some examples of the present application, the axis of the first connection port 2401 is perpendicular to the axis of the second connection port 2402. This allows the peripheral space of the central control device 24 to be utilized efficiently, making the hydraulic suspension system 1000 more compact.

[0059] 1 and 2, in some embodiments of the present application, the hydraulic suspension system 1000 further includes a first control valve 3, a second control valve 4, a third control valve 5, and a fourth control valve 6, where the first control valve 3 is provided between a fifth port 24021 and the reservoir, the second control valve 4 is provided between a sixth port 24022 and the reservoir, the third control valve 5 is provided between a seventh port 24023 and the reservoir, and the fourth control valve 6 is provided between an eighth port 24024 and the reservoir. Thus, by controlling the operating states of the first control valve 3 to the fourth control valve 6, it is possible to control whether or not the oil in the reservoir flows into the height adjustment device through the central control device.

[0060] Preferably, the control valve includes a first control valve 3, a second control valve 4, a third control valve 5, and a fourth control valve 6, and selectively connects one of the second connection port 2402 and the damper to the reservoir. The passage switching in the control valve here can not only realize direct flow from the reservoir to the height adjustment device, but also realize flow from the reservoir to the height adjustment device through the central control device. This eliminates the need to provide two branch paths and two valves to respectively realize direct flow from the reservoir to the height adjustment device and flow from the reservoir to the height adjustment device through the central control device.

[0061] Of course, in other embodiments this may be achieved by providing two branches and two valves.

[0062] In some embodiments of the present application, a first connecting passage is provided between the first control valve 3 and the fourth control valve 6, and a fifth control valve 7 is provided in the first connecting passage, and a second connecting passage is provided between the second control valve 4 and the third control valve 5, and a sixth control valve 8 is provided in the second connecting passage.

[0063] Specifically, when the fifth control valve 7 is opened, the fifth port 24021 and the eighth port 24024 communicate with each other, thereby communicating the first chamber 243 and the fourth chamber 246. When the sixth control valve 8 is opened, the sixth port 24022 and the seventh port 24023 communicate with each other, thereby communicating the second chamber 244 and the third chamber 245. Therefore, the plurality of height adjustment devices communicate with each other, and the purpose of maintaining the height of the vehicle body can be achieved.

[0064] 5 and 6, in some embodiments of the present application, the moving member 241 includes a first portion 2410, a second portion 2411, and a third portion 2412, the first portion 2410 moves axially along the side wall of the housing 240 to divide the housing 240 into a first region and a second region, the second portion 2411 is connected to one side of the first portion 2410 and moves along the side wall of the housing 240 to divide the first region into a first chamber 243 and the second chamber 244, and the third portion 2412 is connected to the other side of the first portion 2410 and moves along the side wall of the housing 240 to divide the second region into a third chamber 245 and a fourth chamber 246. This makes the structure of the moving member 241 simple.

[0065] Preferably, the housing 240 has a first cylinder 2403, a second cylinder 2404, and a third cylinder 2405 arranged in order along the moving direction of the moving member 241, the inner diameter of the second cylinder 2404 is larger than the inner diameter of the first cylinder 2403 and is larger than the inner diameter of the third cylinder 2405, a first chamber 243 is formed between the second portion 2411 and the inner wall of the first cylinder 2403, the first portion 2410 contacts the inner wall of the second cylinder 2404 to divide the second cylinder 2404 into a second chamber 244 and a third chamber 245, and a fourth chamber 246 is formed between the third portion 2412 and the inner wall of the third cylinder 2405. This makes the structure of the central control device 24 simple.

[0066] In some examples of the present application, the extension direction of the first portion 2410 is perpendicular to the extension direction of the second portion 2411, and the extension direction of the second portion 2411 and the third portion 2412 are provided symmetrically with respect to the first portion 2410. This ensures that the volumes of the first region and the second region are the same.

[0067] In some embodiments of the present application, a return spring is provided between the moving member 241 and the end wall of the housing 240, which can push the moving member 241 to return to the middle position.

[0068] 5, the central control device 24 preferably further includes a first return spring 247 and a second return spring 248, both ends of the first return spring 247 abut against the left end of the housing 240 and the moving member 241, respectively, and both ends of the second return spring 248 abut against the right end of the housing 240 and the moving member 241, respectively, and the first return spring 247 and the second return spring 248 push the moving member 241 to return toward the middle. Specifically, when the moving member 241 moves to the left due to the roll of the vehicle, the first return spring 247 can push the moving member 241 to the right to return. When the moving member 241 moves to the right due to the roll of the vehicle, the second return spring 248 can push the moving member 241 to the left to return, thereby ensuring the reliability of the central control device 24.

[0069] In some examples of the present application, as shown in FIG. 5 , the central control device 24 includes a guide unit 249, the guide unit 249 includes a first guide member 2490 and a second guide member 2491, the first guide member 2490 and the second guide member 2491 are slidably engaged with each other, the first guide member 2490 is fixed to the housing 240, the second guide member 2491 is fixed to the moving member 241, the first return spring 247 is fitted on the left guide unit 249, and the first guide member 2491 is fixed to the moving member 241. The second return spring 248 is fitted onto the right guide unit 249 and abuts against the first guide member 2490, and the provision of the guide unit 249 not only facilitates assembly of the first return spring 247 and the second return spring 248, but also makes it easy to limit the deformation range of the first return spring 247 and the second return spring 248, and prevents the first return spring 247 and the second return spring 248 from failing due to excessive deformation.

[0070] Preferably, the second guide member 2491 is a screw, and one end of the second guide member 2491 enters into the first guide member 2490 and is movably engaged with the first guide member 2490, thereby simplifying the structure of the guide unit 249.

[0071] As shown in Figures 1 to 7, the hydraulic suspension system 1000 according to the embodiment of the present application includes a central control unit 24, four sets of damper assemblies 2, and a reservoir, the reservoir includes an oil storage pot 1, the height adjustment device includes a damper assembly, and the reservoirs of the multiple sets of height adjustment devices are identical, which can save costs and make the hydraulic suspension system 1000 more compact.

[0072] The central control unit 24 includes a housing 240 and a movable member 241, which is movably disposed within the housing 240 and cooperates with the housing 240 to define a first chamber 243, a second chamber 244, a third chamber 245 and a fourth chamber 246, which are arranged sequentially in the movement direction of the movable member 241, the first chamber 243 and the second chamber 244 being distributed on one side of a first portion 2411 of the movable member 241, the third chamber 245 and the fourth chamber 246 being distributed on the other side of the first portion 2411, and the first portion 2411 being movably engaged with the inner wall of the housing 240.

[0073] The four sets of damper assemblies 2 are divided into a left front damper assembly 2, a left rear damper assembly 2, a right front damper assembly 2 and a right rear damper assembly 2, and each set of damper assemblies 2 includes a damper 200, the damper 200 includes a damper housing 201, a piston 202 and a piston rod 203, the piston 202 is located in the damper housing 201 and cooperates with the damper housing 201 to define an upper chamber 2011 and a lower chamber 2012, the piston rod 203 is provided in the piston 202, the upper end of the piston rod 203 is configured to be connected to the vehicle body, an oil passage 204 is provided in the piston rod 203, and the oil passage 204 communicates with the lower chamber 2012. In the description of this application, the front refers to the direction toward the head of the vehicle, the rear refers to the direction toward the tail of the vehicle, and in the forward direction, the right side is the direction to the right of the main driver and the left side is the direction to the left of the main driver.

[0074] The oil passage 204 of the left front damper assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear damper assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear damper assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front damper assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For convenience of explanation, the following will be described using an example in which the oil passage 204 of the left front damper assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear damper assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear damper assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front damper assembly 2 is connected to the fourth chamber 246.

[0075] Specifically, when the vehicle has a tendency to roll, for example, when the piston rods 203 of the left front damper assembly 2 and the left rear damper assembly 2 are compressed and the piston rods 203 of the right front damper assembly 2 and the right rear damper assembly 2 are pulled, the oil in the lower chamber 2012 of the left front damper assembly 2 flows into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear damper assembly 2 flows into the third chamber 245 through the oil passage 204, and the oil in the first chamber 243 flows into the third chamber 245 through the oil passage 204. Since the spring 243 and the third chamber 245 are located on either side of the first part 2411, the direction of the force of the oil in the first chamber 243 acting on the first part 2411 is opposite to the direction of the force of the oil in the third chamber 245 acting on the first part 2411, and the two opposite acting forces cancel each other out, so that the movable member 241 does not move. As a result, the movement of the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the left rear damper assembly 2 can be suppressed, thereby suppressing roll.

[0076] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted and the compression width of the left front damper assembly 2 becomes larger than the compression width of the left rear damper assembly 2. In this case, the amount of oil flowing from the left front damper assembly 2 into the first chamber 243 becomes greater than the amount of oil flowing from the left rear damper assembly 2 into the third chamber 245. Therefore, the moving member 241 moves to the right and presses the third chamber 245 and the fourth chamber 246. The oil in the third chamber 245 flows into the lower chamber 2012 of the left rear damper assembly 2 and moves the piston rod 203 upward. The oil in the fourth chamber 246 flows into the lower chamber 2012 of the right front damper assembly 2 and moves the piston rod 203 upward. This reduces the possibility of the left rear wheel and the right front wheel leaving the ground, improving the stability of the vehicle.

[0077] Of course, it can be understood that the above several situations are merely illustrative, and when the vehicle encounters other situations such as right front wheel lift, left rear wheel lift, etc., the oil will still flow according to the above interlocking principle to improve the stability of the vehicle, and each situation will not be described in detail here.

[0078] In the hydraulic suspension system 1000 according to the embodiment of the present application, a central control device 24 and four damper assemblies are provided, and each damper assembly 2 is provided with an oil passage 204, so that if the vehicle has a tendency to roll, it can suppress the roll. If the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the vehicle tilt width, thereby preventing the vehicle from tilting.

[0079] As shown in Figures 1 and 2, the oil storage pot 1 and the central control device are connected by a third connecting passage, and the first control valve 3 to the fourth control valve 6 are each provided in the corresponding third connecting passage and connect or disconnect the corresponding third connecting passage; that is, when the control valve corresponding to each set of damper assemblies 2 blocks the corresponding third connecting passage, the flow path between the oil storage pot 1 and the first chamber, second chamber, third chamber and fourth chamber corresponding to the central control device is blocked, and the oil in the oil storage pot 1 does not flow into the corresponding central control device.

[0080] Specifically, the hydraulic suspension system 1000 has a lift mode and a height reduction mode, and in the lift mode, the oil can flow into the oil passage 204 of the left front damper assembly 2, the oil passage 204 of the right front damper assembly 2, the oil passage 204 of the left rear damper assembly 2, and the oil passage 204 of the right rear damper assembly 2, and the oil flowing into each oil passage 204 flows into the lower chamber 2012, so that the oil pressure in the lower chamber 2012 increases to move the piston 202 upward, and the piston 202 moves upward to move the piston rod 203 upward. The piston rod 203 of the left front damper assembly 2 moves upward, the piston rod 203 of the right front damper assembly 2 moves upward, the piston rod 203 of the left rear damper assembly 2 moves upward, and the piston rod 203 of the right rear damper assembly 2 moves upward, moving the vehicle body upward, thereby realizing the purpose of lifting the vehicle body.

[0081] In the height reduction mode, oil can flow into the oil storage pot 1 from the oil passage 204 of the left front damper assembly 2, the oil passage 204 of the right front damper assembly 2, the oil passage 204 of the left rear damper assembly 2, and the oil passage 204 of the right rear damper assembly 2, respectively, so that the oil pressure in the lower chamber 2012 of each damper 200 is reduced, causing the piston 202 to move downward, and the piston 202 moves downward to move the piston rod 203 to move downward. The piston rod 203 of the left front damper assembly 2 moves downward, the piston rod 203 of the right front damper assembly 2 moves downward, the piston rod 203 of the left rear damper assembly 2 moves downward, and the piston rod 203 of the right rear damper assembly 2 moves downward, causing the vehicle body to move downward, thereby achieving the purpose of reducing the height of the vehicle body.

[0082] When a vehicle is traveling, it will encounter various road conditions. After the suspension system of the vehicle in the related art is selected, it cannot be adjusted while the vehicle is traveling. Therefore, the traditional suspension can only ensure that the vehicle achieves the optimal matching of performance under specific road and speed conditions, and passively receives the acting force of the ground on the vehicle body, and cannot change the suspension parameters according to the road and vehicle speed, and furthermore, cannot actively control the acting force of the ground on the vehicle body.

[0083] The hydraulic suspension system 1000 according to the embodiment of the present application can adjust the height of the vehicle body according to road conditions, etc. For example, when traveling on a relatively rough mountain road, the hydraulic suspension system 1000 can enter a lift mode to raise the center of gravity of the vehicle and improve the stability of the vehicle. When it is necessary to reduce the influence of the vehicle body on the traveling speed, the hydraulic suspension system 1000 can enter a height reduction mode to lower the center of gravity of the vehicle. Of course, it can be understood that the above is merely an exemplary description, and the height of the vehicle body can be adjusted according to the actual needs during traveling.

[0084] The hydraulic suspension system 1000 according to the embodiment of the present application can adjust the height of the vehicle body, improve the vehicle handling stability without compromising the vehicle comfort, and effectively resolve the contradiction between the vehicle comfort and the handling stability. In addition, the use of the hollow piston rod 203 not only reduces the weight, but also allows the oil passage 204 defined by the hollow piston rod 203 to be used to realize the inflow or outflow of oil to adjust the position of the piston rod 203, which has a simple adjustment method, high reliability, low cost, and fast response speed.

[0085] As shown in FIG. 1-FIG. 2, in some embodiments of the present application, the oil storage pot 1 has an oil outlet and an oil inlet, and the reservoir further includes a control pump 26 and an oil return valve 27, and the control pump 26 is connected to the oil outlet and the third connecting passage, respectively, to guide the oil in the oil storage pot 1 to the third connecting passage. The oil return valve 27 is connected to the oil inlet and the third connecting passage, respectively, and when the oil return valve 27 is opened, the oil flows from the third connecting passage to the oil inlet. That is, the oil storage pot 1 has an independent oil inlet passage and an oil outflow passage, and when the oil needs to flow out, the control pump 26 is opened and the oil return valve 27 is in a closed state, and the control pump 26 guides the oil to each set of damper assemblies 2. When the oil needs to flow in, the control pump 26 is closed and the oil return valve 27 is opened, and the oil flowing out from each set of damper assemblies 2 can flow into the oil storage pot 1 through the oil return valve 27. This ensures a smooth flow of oil in and out by providing two separate passages.

[0086] 1 and 2, in some examples of the present application, the controlled pump 26 includes a control valve body 260 and a drive motor 261, and the drive motor 261 is electrically connected to a valve in the control valve body 260, and the drive motor 261 rotates to control the rotation of the valve to turn on or off the controlled pump 26. In this way, the control pump 26 is turned on or off by cooperation between the drive motor 261 and the valve, which ensures relatively reliable operation of the controlled pump 26 and reduces the influence of oil on the turning on or off of the controlled pump 26.

[0087] Preferably, as shown in Figures 1 to 2, the hydraulic suspension system 1000 further includes a check valve 28, which is provided at the outlet end of the control pump 26 and is unidirectional, so that in the event of oil inflow, the check valve 28 can effectively prevent oil from flowing into the control pump 26, and can prevent oil from flowing into the oil outlet through the control pump 26 in the event of a failure of the control pump 26.

[0088] In some embodiments of the present application, as shown in Figures 1-2, the hydraulic suspension system 1000 further includes a pressure retaining accumulator 29, which is provided at the outlet end of the controlled pump 26 and can retain pressure to eliminate flow rate fluctuations at the outlet end of the controlled pump 26.

[0089] In some examples of the present application, the pressure retention accumulator 29 can be a metal bellows accumulator, which is composed of a cylinder assembly and a bellows assembly as shown in FIG. 7. The cylinder assembly includes an upper cover, a packing, a cylinder tube, a snap ring and a seal ring, and the bellows assembly includes a seal cap, a guide ring, a bellows and a lower cover. The metal bellows accumulator may use a metal bellows 101 as a flexible separation element between the fluid and the gas, instead of an airbag or a diaphragm. The bellows can be used in a very wide temperature range. The metal bellows is completely airtight because it is welded to other members. It can move up and down inside the accumulator without friction or wear, and can operate for a long time with only one adjustment.

[0090] In some embodiments of the present application, as shown in Figures 1-2, the hydraulic suspension system 1000 further includes a relief valve 31, which is located at the outlet end of the control pump 26. When the pressure at the oil outlet of the control pump 26 reaches a certain threshold, the relief valve 31 is opened to relieve pressure, so as to ensure that the hydraulic suspension system 1000 is within a normal pressure range. Note that the working principle of the relief valve 31 has already become a conventional technology, and will not be described in detail here.

[0091] As shown in Figures 1 and 2, in some embodiments of the present application, the hydraulic suspension system 1000 further includes a first connecting passage and a second connecting passage, the first connecting passage being connected to an oil passage 204 of the left front damper assembly 2 and an oil passage 204 of the right front damper assembly 2, respectively, and the first connecting passage is provided with a fifth control valve 7 for opening or closing it.

[0092] The second connecting passages are connected to the oil passages 204 of the left rear damper assembly 2 and the oil passages 204 of the right rear damper assembly 2, respectively, and a sixth control valve 8 is provided in the second connecting passage for connecting or disconnecting the second connecting passage.

[0093] Specifically, when the fifth control valve 7 is opened, the first connecting passage is opened, and when the fifth control valve 7 is closed, the first connecting passage is blocked. When the sixth control valve 8 is opened, the second connecting passage is opened, and when the sixth control valve 8 is closed, the second connecting passage is blocked.

[0094] When it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 switches to a height maintaining mode, the fifth control valve 7 and the sixth control valve 8 are both opened, the first connecting passage and the second connecting passage are connected, the oil passage 204 of the left front damper assembly 2 communicates with the oil passage 204 of the right front damper assembly 2, and the oil passage 204 of the left rear damper assembly 2 communicates with the oil passage 204 of the left rear damper assembly 2. That is, the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the right front damper assembly 2 are in an interlocking state, and the piston rod 203 of the left rear damper assembly 2 and the piston rod 203 of the left rear damper assembly 2 are in an interlocking state, so that the current height of the vehicle body can be maintained as much as possible.

[0095] In some embodiments of the present application, as shown in FIG. 1-FIG. 2, the height adjustment device further includes a connecting passage and an accumulator module, the connecting passage is connected between the central control device and the corresponding damper, the accumulator module includes a damping adjustment accumulator 9 and an opening adjustment valve 80, the damping adjustment accumulator 9 is connected between the damper and the central control device, and the opening adjustment valve 80 is provided between the damping adjustment accumulator 9 and the damper. By adjusting the flow rate of oil in the corresponding connecting passage, the damping of the corresponding connecting passage can be adjusted to achieve the purpose of adjusting the damping of the hydraulic suspension system 1000, so that the damping of the hydraulic suspension system 1000 can be adjusted according to the actual situation, for example, according to the road conditions, etc., to ensure that the damping of the hydraulic suspension system 1000 meets the vibration control requirements, and effectively resolve the contradiction between the comfort and the handling stability of the vehicle. In some examples of the present application, the opening adjustment valve 80 includes a first motor and a first valve body, and the first motor controls the operation of the valve in the first valve body to change the flow area of ​​the first valve body to achieve the purpose of flow rate adjustment.

[0096] When the opening of the aperture control valve 80 becomes smaller and the amount of oil that can flow in the connecting passage decreases, the flow path from the damper to the connecting passage becomes narrower and the damping of the damper becomes greater. When the opening of the aperture control valve 80 becomes larger, the flow path from the damper to the connecting passage becomes wider and the damping of the damper becomes smaller, so that the cooperation of the damping adjustment accumulator 9 and the aperture control valve 80 ensures the reliability of adjusting the damping of the hydraulic suspension system 1000 and ensures that the amount of oil flowing in the connecting passage matches the required damping.

[0097] In some embodiments of the present application, as shown in Figures 1-2, the accumulator module includes a stiffness adjustment accumulator 10, and one stiffness adjustment accumulator 10 is provided corresponding to each set of damper assemblies 2, and the stiffness adjustment accumulator 10 is connected to the connection passage at the stiffness adjustment connection point, and a stiffness adjustment valve 11 is provided between the stiffness adjustment accumulator 10 and the stiffness adjustment connection point, so that the oil in the oil storage pot 1 can flow into the stiffness adjustment accumulator 10 for accumulation. When it is necessary to increase the stiffness, the first control valve 3 to the fourth control valve 6 are all closed, and the stiffness adjustment valve 11 is also closed, so that the stiffness adjustment accumulator 10 is isolated from the corresponding damper 200, and the stiffness of the suspension is improved.

[0098] As can be seen, each stiffness adjustment valve 11 can be adjusted independently, so that the stiffness of the front and rear sides of the hydraulic suspension system 1000 are not consistent to meet the needs of different situations. For example, in the case of an anti-nose dive situation of a vehicle and an anti-roll situation when turning, the front axle needs to provide greater stiffness, so the stiffness adjustment valves 11 corresponding to the left front damper assembly 2 and the right front damper assembly 2 can be closed, and the stiffness adjustment valves 11 corresponding to the right rear damper assembly 2 and the left rear damper assembly 2 can be opened.

[0099] In some examples of the present application, the damping adjustment accumulator 9 uses a metal bellows accumulator, and the stiffness adjustment accumulator 10 uses a diaphragm-type accumulator, which has a quicker pressure accumulation capability and a larger pressure accumulation amount than the metal bellows accumulator. The diaphragm-type accumulator can reach a higher pressure accumulation amount in a relatively short time, so the stiffness adjustment accumulator 10 uses the diaphragm-type accumulator to accumulate pressure in each suspension to realize the vehicle lift. Note that the accumulation principles of the metal bellows accumulator and the diaphragm-type accumulator are both prior art, and will not be described in detail here.

[0100] In some embodiments of the present application, as shown in Fig. 1, the height adjustment device further includes a seventh control valve 12, which is disposed between the stiffness adjustment connection point and the damping adjustment accumulator 9. Specifically, the hydraulic suspension system 1000 may have a pressure boosting mode, in which the first control valve 3 to the fourth control valve 6 are all opened, the seventh control valve 12 is closed, the stiffness adjustment valve 11 is opened, and the oil in the oil storage pot 1 flows into the stiffness adjustment accumulator 10 for accumulation.

[0101] When it is necessary to switch to the lift mode, the first control valve 3 to the fourth control valve 6 are all closed, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is opened, and the oil in the stiffness adjustment accumulator 10 flows into the oil passage 204 to raise the piston 202. When it is necessary to switch to the height reduction mode, the first control valve 3 to the fourth control valve 6 are all opened, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is opened, and the oil flowing out from the oil passage 204 of the damper 200 is returned to the oil storage pot 1. Therefore, by providing the seventh control valve 12, it is possible to accumulate oil first using the stiffness adjustment valve 11, and when it is necessary to perform lift or stiffness adjustment, it can be achieved by opening and closing the stiffness adjustment valve 11, and the response speed is fast and reliable.

[0102] Preferably, the hydraulic suspension system 1000 may further have an anti-nose dive braking mode and an anti-squat acceleration mode, and while the vehicle is running, one of the first control valve 3 to the fourth control valve 6 corresponding to each set of damper assemblies 2 is controlled to be closed, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is closed, so that the oil passage 204 of each set of damper assemblies 2 communicates with the damping adjustment accumulator 9, and the damping adjustment accumulator 9 can adjust the amount of oil in the corresponding damper 200. Therefore, the damper 200 corresponding to each set of damper assemblies 2 has a reaction force against the movement tendency of the vehicle body at the corresponding position, so that the hydraulic suspension system 1000 has an anti-nose dive braking mode and an anti-squat acceleration mode.

[0103] As shown in FIG. 2, in some embodiments of the present application, the reservoir further includes a central accumulator 13, and the first control valve 3 to the fourth control valve 6 corresponding to the multiple damper assemblies 2 are all connected to the central accumulator 13. That is, when the first control valve 3 to the fourth control valve 6 are all closed, the oil in the oil storage pot 1 flows into the central accumulator 13 for accumulation. When the first control valve 3 to the fourth control valve 6 are all opened, the oil in the central accumulator 13 can flow into the oil passage 204 of each damper assembly 2, so that the central accumulator 13 can be provided to first accumulate by boosting pressure, and ensure that the oil can reliably flow into each damper assembly 2, which facilitates further adjustment of the damping system and stiffness coefficient of the hydraulic suspension system 1000. As shown in FIG. 2, in the lift mode, the oil in the central accumulator 13 can flow into the oil passage 204.

[0104] 1 and 2, in some embodiments of the present application, each damper assembly 2 is provided with one corresponding pressure-reducing accumulator 30, and each pressure-reducing accumulator 30 communicates with a corresponding oil passage 204. Therefore, when the vehicle is subjected to a vibration or shock while traveling, the oil in the lower chamber 2012 of each damper assembly 2 flows into the pressure-reducing accumulator 30 through the oil passage 204 and is accumulated, thereby achieving a rapid pressure reduction.

[0105] 1 to 4, in some embodiments of the present application, each set of damper assemblies 2 includes a vibration damping spring 205, and both ends of the vibration damping spring 205 are configured to be connected to the vehicle body and the axle. Therefore, by providing the vibration damping spring 205, it is possible to increase the cushioning effect of each set of damper assemblies 2 and reduce the shaking of the vehicle body while the vehicle is running.

[0106] Preferably, as shown in Figures 1 to 4, the vibration damping spring 205 of the left front damper assembly 2 is fitted and fixed to the outside of the damper 200, the vibration damping spring 205 of the right front damper assembly 2 is fitted and fixed to the outside of the damper 200, the vibration damping spring 205 of the left rear damper assembly 2 is arranged in parallel to the damper 200, and the vibration damping spring 205 of the right rear damper assembly 2 is arranged in parallel to the damper 200.

[0107] Hereinafter, with reference to Figures 1 and 2, a hydraulic suspension system 1000 according to two specific examples of the present application will be described in detail. To facilitate understanding, the above embodiments are merely illustrative and not limiting, and each embodiment can be modified exemplarily according to actual conditions. EXAMPLES

[0108] As shown in FIG. 1, a hydraulic suspension system 1000 according to an embodiment of the present application includes a left front damper assembly 2, a right front damper assembly 2, a left rear damper assembly 2, a right rear damper assembly 2, an oil storage pot 1, a control pump 26, an oil return valve 27, a check valve 28, a pressure retention accumulator 29, a relief valve 31, an opening adjustment valve 80, a damping adjustment accumulator 9, a stiffness adjustment accumulator 10, a pressure reducing accumulator 30, a central control device 24, a first connecting passage, and a second connecting passage.

[0109] The left front damper assembly 2 and the right front damper assembly 2 both include a damper 200 and a vibration damping spring 205, and the vibration damping spring 205 is fitted and fixed to the outside of the damper 200. The left rear damper assembly 2 and the right rear damper assembly 2 both include a damper 200 and a vibration damping spring 205, and the vibration damping spring 205 is provided in parallel with the damper 200, and both ends of the vibration damping spring 205 of the left rear damper assembly 2 are connected to the vehicle body and the axle, respectively. Both ends of the vibration damping spring 205 of the right rear damper assembly 2 are connected to the vehicle body and the axle, respectively. Each damper 200 includes a damper housing 201, a piston rod 203, and a piston 202. The piston rod 203 is connected to the piston 202. The piston 202 is movably provided within the damper housing 201 to divide an upper chamber 2011 and a lower chamber 2012. An oil passage 204 is provided within the piston rod 203 and communicates with the lower chamber 2012. The central control device is connected to the oil storage pot 1 by a third connecting passage. The first control valve 3 to the fourth control valve 6 are each provided in the corresponding third connecting passage.

[0110] The oil storage pot 1 has an oil outlet and an oil inlet, and the control pump 26 is connected to the oil outlet and the third connecting passage respectively to guide the oil in the oil storage pot 1 to the third connecting passage. The oil return valve 27 is connected to the oil inlet and the third connecting passage respectively, and when the oil return valve 27 is opened, the oil flows from the third connecting passage to the oil inlet. The check valve 28 is provided at the outlet end of the control pump 26 and is unidirectional. The pressure holding accumulator 29 is provided at the outlet end of the control pump 26 and is located between the check valve 28 and the control pump 26, and the pressure holding accumulator 29 can stabilize and eliminate the flow rate fluctuation at the outlet end of the control pump 26.

[0111] The hydraulic suspension system 1000 includes a common flow path and four branch flow paths, and the four branch flow paths are respectively connected to the oil passages 204 of the four damper assemblies 2. The check valve 28 and the oil return valve 27 are respectively connected to the common flow path. The relief valve 31 is connected to the common flow path.

[0112] The first control valve 3 to the fourth control valve 6 are connected in series in one-to-one correspondence with the four branch flow paths, and the first control valve 3 to the fourth control valve 6 control the opening or closing of the corresponding branch flow paths.

[0113] The stiffness control accumulator 10 corresponding to each damper assembly 2 is connected to the corresponding branch flow path, and a stiffness control valve 11 is provided at the oil inlet and outlet of the stiffness control accumulator 10, and the stiffness control valve 11 is normally in a closed state.

[0114] Each branch passage is further provided with an opening adjustment valve 80, a damping adjustment accumulator 9, and a seventh control valve 12. The opening adjustment valve 80 adjusts the flow rate through the corresponding branch passage to adjust the damping of the hydraulic suspension system 1000. The damping adjustment accumulator 9 is capable of accumulation. The seventh control valve 12 is provided between the damping adjustment accumulator 9 and the stiffness adjustment accumulator 10.

[0115] One pressure-reducing accumulator 30 is provided corresponding to each damper assembly 2, and the pressure-reducing accumulator 30 corresponding to the left front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204, and the pressure-reducing accumulator 30 corresponding to the right front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204. The pressure-reducing accumulator 30 corresponding to the left rear damper assembly 2 is connected to the corresponding branch flow passage, and the pressure-reducing accumulator 30 corresponding to the right rear damper assembly 2 is directly connected to the corresponding branch flow passage.

[0116] Specifically, hydraulic suspension system 1000 has a pressure increase mode, a lift mode, and a height reduction mode, and in the pressure increase mode, the first control valve 3 to the fourth control valve 6 are all opened, the seventh control valve 12 is closed, the stiffness adjustment valve 11 is opened, and the control pump 26 is operated, so that the oil in the oil storage pot 1 flows through the four branch flow paths into the corresponding stiffness adjustment accumulators 10 and is accumulated. After accumulation using each stiffness adjustment accumulator 10, the stiffness adjustment valve 11 is closed.

[0117] In the lift mode, the oil in the oil storage pot 1 can flow into the oil passage 204 of the left front damper assembly 2, the oil passage 204 of the right front damper assembly 2, the oil passage 204 of the left rear damper assembly 2, and the oil passage 204 of the right rear damper assembly 2, and the oil flowing into each oil passage 204 flows into the lower chamber 2012, so that the oil pressure in the lower chamber 2012 increases to move the piston 202 upward, and the piston 202 moves upward to move the piston rod 203 upward. The piston rod 203 of the left front damper assembly 2 moves upward, the piston rod 203 of the right front damper assembly 2 moves upward, the piston rod 203 of the left rear damper assembly 2 moves upward, and the piston rod 203 of the right rear damper assembly 2 moves upward, moving the vehicle body upward, thereby achieving the purpose of lifting the vehicle body.

[0118] In the height reduction mode, the oil can flow out from the oil passage 204 of the left front damper assembly 2, the oil passage 204 of the right front damper assembly 2, the oil passage 204 of the left rear damper assembly 2, and the oil passage 204 of the right rear damper assembly 2, respectively, so that the oil pressure in the lower chamber 2012 of each damper 200 is reduced, causing the piston 202 to move downward, and the piston 202 moves downward to move the piston rod 203 to move downward. The piston rod 203 of the left front damper assembly 2 moves downward, the piston rod 203 of the right front damper assembly 2 moves downward, the piston rod 203 of the left rear damper assembly 2 moves downward, and the piston rod 203 of the right rear damper assembly 2 moves downward, causing the vehicle body to move downward, thereby achieving the purpose of reducing the vehicle body height. As can be appreciated, in height reduction mode, the oil flowing out of each set of damper assemblies 2 may flow directly into the oil storage pot 1, may flow into the accumulator assembly for accumulation, or may flow into the oil storage pot 1 and the accumulator assembly simultaneously.

[0119] When the pressure in the hydraulic suspension system 1000 is high, for example when it is detected that the pressure at the outlet of the control pump 26 reaches a certain threshold (30 MPa), the oil return valve 27 is opened and relieved to protect the hydraulic suspension system 1000 within the normal pressure range, and at this time, the oil in each damper 200 can flow into the oil storage pot 1.

[0120] After the relief, if the pressure in the hydraulic suspension system 1000 is still large or is large during operation, the relief valve 31 can be opened to relieve the pressure, thereby ensuring the reliability of the entire hydraulic suspension system 1000 .

[0121] When the damping of hydraulic suspension system 1000 is large while the vehicle is running, causing the vehicle body to shake and affecting comfort, the amount of oil in each branch passage can be adjusted by the aperture adjustment valve 80 to adjust the damping of hydraulic suspension system 1000, and when the aperture of aperture adjustment valve 80 is reduced and the passage from the damper to the connecting passage is narrowed, the damping of the damper increases. When the aperture of aperture adjustment valve 80 is increased, the passage from the damper to the connecting passage is widened and the damping of the damper decreases, allowing the damping of hydraulic suspension system 1000 to be reliably adjusted.

[0122] When the stiffness of the hydraulic suspension system 1000 is high and reduces the comfort of the vehicle, the stiffness adjustment valve 11 can be controlled to open to replenish the oil in the stiffness adjustment accumulator 10 into each branch flow path, thereby reducing the stiffness of the hydraulic suspension system 1000 and increasing the cushioning effect of the hydraulic suspension system 1000 against shaking.

[0123] When the vehicle is subjected to a swaying shock or the like while the vehicle is running, the oil in the lower chamber 2012 of each damper assembly 2 flows through the oil passage 204 into the pressure-reducing accumulator 30 for accumulation, thereby realizing a rapid pressure reduction. Since the front axle of the vehicle needs to ensure the running stability and the rear axle of the vehicle needs to mainly ensure the comfort, the pressure-reducing accumulator 30 corresponding to the left front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204, and the pressure-reducing accumulator 30 corresponding to the right front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204, thereby realizing a rapid relief.

[0124] The central control unit 24 includes a housing 240 and a movable member 241, which is movably disposed within the housing 240 and cooperates with the housing 240 to define a first chamber 243, a second chamber 244, a third chamber 245 and a fourth chamber 246, which are arranged sequentially in the movement direction of the movable member 241, the first chamber 243 and the second chamber 244 being distributed on one side of a first portion 2411 of the movable member 241, the third chamber 245 and the fourth chamber 246 being distributed on the other side of the first portion 2411, and the first portion 2411 being movably engaged with the inner wall of the housing 240.

[0125] The oil passage 204 of the left front damper assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear damper assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear damper assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front damper assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For convenience of explanation, the following will be described using an example in which the oil passage 204 of the left front damper assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear damper assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear damper assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front damper assembly 2 is connected to the fourth chamber 246.

[0126] Specifically, when the vehicle has a tendency to roll, for example, when the piston rods 203 of the left front damper assembly 2 and the left rear damper assembly 2 are compressed and the piston rods 203 of the right front damper assembly 2 and the right rear damper assembly 2 are pulled, the oil in the lower chamber 2012 of the left front damper assembly 2 flows into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear damper assembly 2 flows into the third chamber 245 through the oil passage 204, and the oil in the first chamber 243 flows into the third chamber 245 through the oil passage 204. Since the spring 243 and the third chamber 245 are located on either side of the first part 2411, the direction of the force of the oil in the first chamber 243 acting on the first part 2411 is opposite to the direction of the force of the oil in the third chamber 245 acting on the first part 2411, and the two opposite acting forces cancel each other out, so that the movable member 241 does not move. As a result, the movement of the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the left rear damper assembly 2 can be suppressed, thereby suppressing roll.

[0127] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted and the compression width of the left front damper assembly 2 becomes larger than that of the left rear damper assembly 2. In this case, the amount of oil flowing from the left front damper assembly 2 into the first chamber 243 becomes greater than the amount of oil flowing from the left rear damper assembly 2 into the third chamber 245. Therefore, the moving member 241 moves to the right and presses the third chamber 245 and the fourth chamber 246. The oil in the third chamber 245 flows into the lower chamber 2012 of the left rear damper assembly 2 and moves the piston rod 203 upward. The oil in the fourth chamber 246 flows into the lower chamber 2012 of the right front damper assembly 2 and moves the piston rod 203 upward. This increases the distance between the right front wheel and the left rear wheel and the vehicle body, reduces the tilt width of the vehicle, and prevents the vehicle from rolling.

[0128] Of course, it can be understood that the above several situations are only exemplary descriptions, and when the vehicle encounters other situations such as right front wheel lift, left rear wheel lift, etc., the oil will also flow according to the above interlocking principle to avoid the vehicle rolling, and each situation will not be described in detail here.

[0129] The first connecting passages are respectively connected to an oil passage 204 of the left front damper assembly 2 and an oil passage 204 of the right front damper assembly 2, and a fifth control valve 7 for connecting or disconnecting the first connecting passage is provided in the first connecting passage.

[0130] The second connecting passages are connected to the oil passages 204 of the left rear damper assembly 2 and the oil passages 204 of the right rear damper assembly 2, respectively, and a sixth control valve 8 is provided in the second connecting passage for connecting or disconnecting the second connecting passage.

[0131] Specifically, when the fifth control valve 7 is opened, the first connecting passage is opened, and when the fifth control valve 7 is closed, the first connecting passage is blocked. When the sixth control valve 8 is opened, the second connecting passage is opened, and when the sixth control valve 8 is closed, the second connecting passage is blocked.

[0132] When it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 switches to a height maintaining mode, the fifth control valve 7 and the sixth control valve 8 are both opened, the first connecting passage and the second connecting passage are connected, the oil passage 204 of the left front damper assembly 2 communicates with the oil passage 204 of the right front damper assembly 2, and the oil passage 204 of the left rear damper assembly 2 communicates with the oil passage 204 of the left rear damper assembly 2. That is, the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the right front damper assembly 2 are in an interlocking state, and the piston rod 203 of the left rear damper assembly 2 and the piston rod 203 of the left rear damper assembly 2 are in an interlocking state, so that the current height of the vehicle body can be maintained as much as possible. EXAMPLES

[0133] As shown in FIG. 2, in this embodiment, the hydraulic suspension system 1000 according to the embodiment of the present application does not include the seventh control valve 12 compared with the embodiment, and the hydraulic suspension system 1000 includes a central accumulator 13 .

[0134] In this embodiment, in the pressure boosting mode, the oil in the oil storage pot 1 flows into the central accumulator 13 and the stiffness adjustment accumulator 10 for accumulation.

[0135] The modes of the hydraulic suspension system 1000 according to this embodiment are similar to those in the first embodiment, and will not be described here.

[0136] A vehicle according to an embodiment of the present application includes the hydraulic suspension system 1000 described in any one of the above embodiments of the present application.

[0137] In the vehicle according to the embodiment of the present application, the central control device 24 and the multiple height adjustment devices can suppress the roll when the vehicle has a tendency to roll. When the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the tilt width of the vehicle, thereby avoiding the roll of the vehicle.

[0138] In the description of the present application, the orientations or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of the present application, and do not indicate or suggest that the devices or elements shown must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be understood as limiting the present application.

[0139] Additionally, the terms "first" and "second" are for descriptive purposes only and should not be understood to indicate or suggest the relative importance or number of the technical features depicted. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, "plurality" means two or more unless explicitly and specifically limited.

[0140] In this application, unless otherwise clearly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and for example, unless otherwise clearly limited, may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two parts, or an interaction relationship between two parts. A person skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0141] In this application, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may include direct contact between the first feature and the second feature, or indirect contact between the first feature and the second feature via an intermediate medium. Furthermore, a first feature being "above," "above," or "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or may simply mean that the horizontal height of the first feature is lower than that of the second feature.

[0142] In the description of this specification, a description referring to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the exemplary expressions of the above terms are not necessarily limited to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described can be appropriately combined in any one or more embodiments or examples. In addition, if not mutually inconsistent, a person skilled in the art can combine or combine different embodiments or examples described in this specification and features of different embodiments or examples.

[0143] Although the embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are illustrative and should not be construed as limiting the present application, and that those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application. [Explanation of symbols]

[0144] 1000 Hydraulic Suspension System 1 Oil Storage Pot 2 Damper Assembly 200 Damper 201 Damper housing 2011 Upper Chamber 2012 Lower Chamber 202 Piston 203 Piston rod 204 Oil passage 205 Vibration damping spring 3. First control valve 4. Second control valve 5. Third control valve 6 Fourth control valve 7. 5th control valve 8. 6th control valve 80 Opening adjustment valve 9 Damping adjustment accumulator 10. Stiffness adjustment accumulator 101 Metal Bellows 11. Stiffness adjustment valve 12 Seventh control valve 13 Central Accumulator 32 Central pressure regulator 24 Central Control Unit 240 Housing 241 Moving parts 2410 First Part 2411 Second Part 2412 Third Part 243 First Chamber 244 Second Chamber 245 Third Chamber 246 Fourth Chamber 247 First Return Spring 248 Second Return Spring 249 Guide unit 2490 First guide member 2491 Second guide member 2401 First connection port 24011 First port 24012 Secondary port 24013 3rd port 24014 4th port 2402 Second connection port 24021 5th port 24022 6th port 24023 7th port 24024 8th port 2403 First Cylinder 2404 Second Cylinder 2405 Third Cylinder 26 Control pump 260 Control valve body 261 Drive motor 27 Oil return valve 28 Check valve 29 Pressure Retention Accumulator 30 Pressure reducing accumulator 31 Relief valve

Claims

1. The vehicle height adjustment system includes a plurality of height adjustment devices and a central control device, the plurality of height adjustment devices being provided in one-to-one correspondence with a plurality of wheels of the vehicle, the central control device includes a housing and a moving member, the moving member being movably disposed within the housing and dividing the housing into a first region and a second region in a moving direction of the moving member, the first region including a first chamber and a second chamber isolated from each other, and the second region including a third chamber and a fourth chamber isolated from each other; A hydraulic suspension system, wherein the first chamber, the second chamber, the third chamber and the fourth chamber are connected to a plurality of the height adjustment devices in a one-to-one correspondence, and the wheels corresponding to the height adjustment devices connected to the first chamber and the second chamber are positioned diagonally, and the wheels corresponding to the height adjustment devices connected to the third chamber and the fourth chamber are also positioned diagonally.

2. 2. The hydraulic suspension system of claim 1, wherein a volume change of the first chamber and the second chamber in the first region is opposite to a volume change of the third chamber and the fourth chamber in the second region.

3. 3. The hydraulic suspension system according to claim 1, wherein the first chamber, the second chamber, the third chamber and the fourth chamber are provided in order along a moving direction of the moving member.

4. 4. The hydraulic suspension system according to claim 1, wherein, in an initial state, the volumes of the first chamber and the fourth chamber are the same, and the volumes of the second chamber and the third chamber are the same.

5. 5. The hydraulic suspension system according to claim 1, wherein one of the front axle height adjustment device and the rear axle height adjustment device is in communication with the first chamber and the third chamber, and the other of the front axle height adjustment device and the rear axle height adjustment device is in communication with the second chamber and the fourth chamber.

6. 6. A hydraulic suspension system as claimed in any one of claims 1 to 5, wherein one of the front axle height adjustment device and the rear axle height adjustment device is in communication with the first chamber and the fourth chamber, and the other of the front axle height adjustment device and the rear axle height adjustment device is in communication with the second chamber and the third chamber.

7. The central control device is provided with a first connection port, the height adjustment device includes a reservoir and a damper, the damper is provided corresponding to a wheel, the reservoir supplies oil to the damper, and the first connection port is in communication with the damper; 7. The hydraulic suspension system according to claim 1, wherein a plurality of the first connection ports are provided, including a first port, a second port, a third port, and a fourth port, and the first port, the second port, the third port, and the fourth port are in communication with the first chamber, the second chamber, the third chamber, and the fourth chamber, respectively.

8. The central control device further includes a second connection port, the second connection port configured to communicate with the reservoir; 8. The hydraulic suspension system according to claim 7, wherein the second connection port is provided in plurality and includes a fifth port, a sixth port, a seventh port, and an eighth port, the fifth port, the sixth port, the seventh port, and the eighth port communicating with the first chamber, the second chamber, the third chamber, and the fourth chamber, respectively.

9. 9. The hydraulic suspension system according to claim 8, wherein an axis of the first connection port is perpendicular to an axis of the second connection port.

10. 10. The hydraulic suspension system of claim 8 or 9, further comprising a first control valve, a second control valve, a third control valve and a fourth control valve, wherein the first control valve is provided between the fifth port and the reservoir, the second control valve is provided between the sixth port and the reservoir, the third control valve is provided between the seventh port and the reservoir, and the fourth control valve is provided between the eighth port and the reservoir.

11. 11. The hydraulic suspension system of claim 10, wherein the control valves include the first control valve, the second control valve, the third control valve, and the fourth control valve, and the control valves selectively communicate one of the second connection port and a damper with the reservoir.

12. 12. The hydraulic suspension system according to claim 10 or 11, wherein a first connecting passage is provided between the first control valve and the fourth control valve, and a fifth control valve is provided in the first connecting passage, a second connecting passage is provided between the second control valve and the third control valve, and a sixth control valve is provided in the second connecting passage.

13. 13. The hydraulic suspension system of claim 1, wherein the moving member includes a first part, a second part and a third part, the first part moving axially along a side wall of the housing to divide the housing into the first region and the second region, the second part connected to one side of the first part and moving along the side wall of the housing to divide the first region into the first chamber and the second chamber, and the third part connected to the other side of the first part and moving along the side wall of the housing to divide the second region into the third chamber and the fourth chamber.

14. 14. The hydraulic suspension system of claim 13, wherein the housing has a first cylinder, a second cylinder, and a third cylinder arranged in order along the movement direction of the moving member, an inner diameter of the second cylinder is larger than an inner diameter of the first cylinder and is also larger than an inner diameter of the third cylinder, the first chamber is formed between the second portion and an inner wall of the first cylinder, the first portion contacts an inner wall of the second cylinder to divide the second cylinder into the second chamber and the third chamber, and the fourth chamber is formed between the third portion and the inner wall of the third cylinder.

15. 15. The hydraulic suspension system according to claim 13, wherein an extension direction of the first portion is perpendicular to an extension direction of the second portion, and the extension direction of the second portion and the third portion are provided symmetrically with respect to the first portion.

16. 16. The hydraulic suspension system of claim 13, wherein the first chamber and the second chamber are located on one side of the first portion, and the third chamber and the fourth chamber are located on the other side of the first portion.

17. The hydraulic suspension system according to any one of claims 1 to 16, wherein a return spring is provided between the moving member and the end wall of the housing.

18. 13. The hydraulic suspension system according to any one of claims 7 to 12, wherein the damper has a damper housing, a piston and a piston rod, the damper housing is configured to be connected to a wheel, the piston is located within the damper housing and cooperates with the damper housing to define an upper chamber and a lower chamber, one end of the piston rod is connected to the piston, the piston rod is configured to be connected to a vehicle body, an oil passage is provided within the piston rod, the oil passage communicates with the lower chamber, and the reservoir supplies oil to the damper via the oil passage.

19. The height adjustment device further includes a connecting passage and an accumulator module, the connecting passage communicating the central control device with the corresponding damper; 19. The hydraulic suspension system according to any one of claims 7 to 12 and 18, wherein the accumulator module includes a damping adjustment accumulator and an opening adjustment valve, the damping adjustment accumulator being connected between the damper and the central control device, and the opening adjustment valve being provided between the damping adjustment accumulator and the damper.

20. 20. The hydraulic suspension system of claim 19, wherein the accumulator module further includes a stiffness adjustment accumulator and a stiffness adjustment valve, the connecting passage being provided with a stiffness adjustment connection point, the stiffness adjustment accumulator communicating with the stiffness adjustment connection point, and the stiffness adjustment valve being provided between the stiffness adjustment accumulator and the stiffness adjustment connection point.

21. 21. The hydraulic suspension system of claim 20, wherein the height adjustment device further includes a seventh control valve, the seventh control valve being disposed between the stiffness adjustment node and the damping adjustment accumulator.

22. The hydraulic suspension system according to any one of claims 1 to 20, wherein the central control device is a cylinder structure.

23. A vehicle including a hydraulic suspension system according to any one of the preceding claims.

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