CN116409099B

CN116409099B - Hydraulic suspension system and vehicle with same

Info

Publication number: CN116409099B
Application number: CN202111655956.1A
Authority: CN
Inventors: 廖银生; 许豪伦; 张宏洲; 黄泰硕; 黄飞
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2024-10-29
Anticipated expiration: 2041-12-30
Also published as: CN116409099A

Abstract

The invention discloses a hydraulic suspension system and a vehicle with the same. The hydraulic suspension system comprises a plurality of shock absorber assemblies, each shock absorber assembly comprises a shock absorber, a piston and a first cylinder body are matched to define an upper chamber and a lower chamber, and the upper end of a piston rod is suitable for being connected with a vehicle body; the upper chamber of the left front shock absorber assembly is communicated with the lower chamber of the left rear shock absorber assembly through a first pipeline, and the lower chamber of the left front shock absorber assembly is communicated with the upper chamber of the left rear shock absorber assembly through a second pipeline; the upper chamber of the right front shock absorber assembly is communicated with the lower chamber of the right rear shock absorber assembly through a third pipeline, and the lower chamber of the right front shock absorber assembly is communicated with the upper chamber of the right rear shock absorber assembly through a fourth pipeline. According to the hydraulic suspension system of the present invention, when the vehicle is subject to a pitch tendency, an anti-pitch force can be provided to avoid continued pitching of the vehicle.

Description

Hydraulic suspension system and vehicle with same

Technical Field

The invention relates to the field of vehicles, in particular to a hydraulic suspension system and a vehicle with the same.

Background

The suspension is a device for transmitting interaction force between a vehicle body and an axle, is one of four components of an automobile, and is a key component for influencing the running performance of the automobile. The suspension can transmit the acting force and moment fed back by the road surface, attenuate the vibration of wheels, alleviate impact, improve the driving experience of a driver and enable the vehicle to obtain ideal motion characteristics and stable driving capability. The suspension in the related art is mostly composed of a spring, a guide mechanism, a shock absorber and the like, wherein the damping coefficient and the spring stiffness of the shock absorber are fixed, and only the shock absorber has a shock absorption effect.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a hydraulic suspension system that can provide an anti-pitch force to avoid the vehicle from continuing to pitch.

The invention further provides a vehicle with the hydraulic suspension system.

A hydraulic suspension system according to an embodiment of the present invention includes: the shock absorber comprises a plurality of shock absorber assemblies, wherein the shock absorber assemblies comprise a left front shock absorber assembly, a left rear shock absorber assembly, a right front shock absorber assembly and a right rear shock absorber assembly, each group of shock absorber assemblies comprises a shock absorber, each shock absorber comprises a first cylinder body, a piston and a piston rod, the piston is positioned in the first cylinder body to be matched with the first cylinder body to define an upper chamber and a lower chamber, and the piston rod is arranged on the piston and the upper end of the piston rod is suitable for being connected with a vehicle body; the upper chamber of the left front shock absorber assembly is communicated with the lower chamber of the left rear shock absorber assembly through a first pipeline, and the lower chamber of the left front shock absorber assembly is communicated with the upper chamber of the left rear shock absorber assembly through a second pipeline; the upper chamber of the right front shock absorber assembly is communicated with the lower chamber of the right rear shock absorber assembly through a third pipeline, and the lower chamber of the right front shock absorber assembly is communicated with the upper chamber of the right rear shock absorber assembly through a fourth pipeline.

According to the hydraulic suspension system provided by the embodiment of the invention, when the vehicle is inclined in pitching, an anti-pitching force can be provided to prevent the vehicle from continuing pitching, so that the riding comfort of the vehicle can be enhanced, and the running stability and safety of the vehicle can be improved.

In some embodiments of the invention, the first conduit communicates with the third conduit through a first connecting conduit to form a first circuit, and the second conduit communicates with the fourth conduit through a second connecting conduit to form a second circuit.

In some embodiments of the invention, the hydraulic suspension system further comprises a first adjusting accumulator and a second adjusting accumulator, the first adjusting accumulator is connected to the first loop, and an oil inlet and an oil outlet of the first adjusting accumulator are provided with a first adjusting valve; the second adjusting energy accumulator is connected to the second loop, and an oil inlet and an oil outlet of the second adjusting energy accumulator are provided with second adjusting valves.

In some embodiments of the present invention, the first connection pipe is provided with a first on-off valve for switching on or off the first connection pipe, and the second connection pipe is provided with a second on-off valve for switching on or off the second connection pipe.

In some embodiments of the invention, the hydraulic suspension system further comprises: the central control cylinder comprises a second cylinder body and a moving member, the moving member is movably arranged in the second cylinder body and is matched with the second cylinder body to define a first chamber, a second chamber, a third chamber and a fourth chamber, the first chamber, the second chamber, the third chamber and the fourth chamber are sequentially arranged in the moving direction of the moving member, the first chamber and the second chamber are distributed on one side of a middle contact part of the moving member, the third chamber and the fourth chamber are distributed on the other side of the middle contact part, and the middle contact part is in moving fit with the inner wall of the second cylinder body; the lower chamber of the left front shock absorber assembly is connected to one of the first chamber and the second chamber, and the lower chamber of the right rear shock absorber assembly is connected to the other of the first chamber and the second chamber; the lower chamber of the left rear shock absorber assembly is connected to one of the third chamber and the fourth chamber, and the lower chamber of the right front shock absorber assembly is connected to the other of the third chamber and the fourth chamber.

In some embodiments of the invention, in the initial state, the central control cylinder is arranged symmetrically with respect to the intermediate contact.

In some embodiments of the invention, a through hole is formed in the piston rod, the through hole penetrating the piston rod to communicate the lower chamber with the central control cylinder.

In some embodiments of the present invention, the hydraulic suspension system further includes a fluid supply circuit having a first branch, a second branch, a third branch, and a fourth branch, the first branch, the second branch, the third branch, and the fourth branch being in communication with the first chamber, the fourth chamber, the third chamber, and the second chamber, respectively, and the fluid being circulated between the lower chamber of the shock absorber and the fluid supply circuit via the central control cylinder.

In some embodiments of the invention, the first branch is provided with a first control valve, the second branch is provided with a second control valve, the third branch is provided with a third control valve, and the fourth branch is provided with a fourth control valve.

In some embodiments of the invention, a fifth control valve is disposed between the first and second branches, and a sixth control valve is disposed between the third and fourth branches.

In some embodiments of the present invention, a damping adjustment branch is disposed between the central control cylinder and the lower chamber, an opening adjustment valve is disposed on the damping adjustment branch, and the hydraulic suspension system further includes a damping adjustment accumulator, which is in communication with the damping adjustment branch.

In some embodiments of the invention, each set of damper assemblies includes a damper spring having opposite ends adapted to be coupled to a vehicle body and an axle.

In some embodiments of the present invention, the damping spring housing of the left front damper assembly is secured to the damper, the damping spring housing of the right front damper assembly is secured to the damper, the damping spring of the left rear damper assembly is juxtaposed to the damper, and the damping spring of the right rear damper assembly is juxtaposed to the damper.

A vehicle according to an embodiment of the present invention includes the hydraulic suspension system according to the above-described embodiment of the present invention.

According to the vehicle provided by the embodiment of the invention, when the vehicle is inclined in pitching, an anti-pitching force can be provided to prevent the vehicle from continuing pitching, so that the riding comfort of the vehicle can be enhanced, and the running stability and safety of the vehicle can be improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic illustration of a hydraulic suspension system according to some embodiments of the present invention;

FIG. 2 is a schematic illustration of a hydraulic suspension system according to further embodiments of the present invention;

FIG. 3 is a schematic illustration of a hydraulic suspension system according to further embodiments of the present invention;

FIG. 4 is a schematic illustration of a hydraulic suspension system according to further embodiments of the present invention;

FIG. 5 is a schematic illustration of the hydraulic suspension system of FIG. 4 in a boost mode;

FIG. 6 is a schematic illustration of the hydraulic suspension system of FIG. 4 in a lift mode;

FIG. 7 is a schematic illustration of the hydraulic suspension system shown in FIG. 4 in a height hold mode;

FIG. 8 is a schematic illustration of the hydraulic suspension system of FIG. 4 in a high-low lowering mode;

FIG. 9 is a schematic illustration of the hydraulic suspension system shown in FIG. 4 in an anti-roll mode;

FIG. 10 is a schematic illustration of the hydraulic suspension system of FIG. 4 in an anti-pitch mode;

FIG. 11 is a schematic illustration of the hydraulic suspension system shown in FIG. 4 in an anti-roll mode and a height hold mode;

FIG. 12 is a schematic illustration of a left front side shock absorber assembly and a right front side shock absorber assembly according to an embodiment of the present invention;

FIG. 13 is a cross-sectional view of the shock absorber assembly shown in FIG. 12;

FIG. 14 is a cross-sectional view of a central control cylinder according to an embodiment of the present invention;

FIG. 15 is a perspective view of a central control cylinder according to an embodiment of the present invention;

Fig. 16 is a schematic diagram of a metal bellows accumulator according to an embodiment of the present invention.

Reference numerals:

A hydraulic suspension system 1000,

A liquid storage pot 1,

Damper assembly 2, damper 200, first cylinder 201, upper chamber 2011, lower chamber 2012, piston 202, piston rod 203, through hole 204, damper spring 205,

A first control valve 3, a second control valve 4, a third control valve 5, a fourth control valve 6, a fifth control valve 7, a sixth control valve 8,

An opening degree adjusting valve 80,

Damping adjustment accumulator 9,

A rigidity-adjusting accumulator 10, a metal bellows 101, a rigidity-adjusting valve 11, a seventh control valve 12,

A central accumulator 13, a central accumulator regulating valve 32,

A first regulating accumulator 16, a second regulating accumulator 17,

A first regulating valve 20, a second regulating valve 21,

A first on-off valve 22, a second on-off valve 23,

The central control cylinder 24, the second cylinder 240, the mover 241, the moving body portion 2410, the intermediate contact portion 2411, the first chamber 243, the second chamber 244, the third chamber 245, the fourth chamber 246, the first return spring 247, the second return spring 248, the guide assembly 249, the first guide 2490, the second guide 2491, the third chamber 245, the fourth chamber 246, the first return spring 247, the second return spring 248, the guide assembly,

The control pump 26, the control valve body 260, the driving motor 261, the oil return valve 27, the check valve 28, the pressure stabilizing accumulator 29, the pressure reducing accumulator 30 and the pressure relief valve 31.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

A hydraulic suspension system 1000 according to an embodiment of the present invention is described below with reference to fig. 1-16, wherein the hydraulic suspension system 1000 is used on a vehicle and the hydraulic suspension system 1000 is used to connect an axle and a body of the vehicle.

As shown in fig. 1 to 16, a hydraulic suspension system 1000 according to an embodiment of the present invention includes: a plurality of damper assemblies 2. The plurality of damper assemblies 2 are divided into a front left damper assembly 2, a rear left damper assembly 2, a front right damper assembly 2 and a rear right damper assembly 2, each group of damper assemblies 2 includes a damper 200, the damper 200 includes a first cylinder 201, a piston 202 and a piston rod 203, the piston 202 is located in the first cylinder 201 to define an upper chamber 2011 and a lower chamber 2012 in cooperation with the first cylinder 201, the piston rod 203 is provided on the piston 202 and an upper end of the piston rod 203 is adapted to be connected with a vehicle body. In the description of the present invention, the front direction refers to the direction toward the vehicle head, the rear direction refers to the direction toward the vehicle tail, and the right hand direction of the main driver is set to the right side and the left hand direction of the main driver is set to the left side in the forward direction.

As shown in fig. 1 to 11, the upper chamber 2011 of the front left shock absorber assembly 2 communicates with the lower chamber 2012 of the rear left shock absorber assembly 2 through a first pipe, and the lower chamber 2012 of the front left shock absorber assembly 2 communicates with the upper chamber 2011 of the rear left shock absorber assembly 2 through a second pipe.

The upper chamber 2011 of the front right damper assembly 2 communicates with the lower chamber 2012 of the rear right damper assembly 2 via a third conduit, and the lower chamber 2012 of the front right damper assembly 2 communicates with the upper chamber 2011 of the rear right damper assembly 2 via a fourth conduit.

Specifically, when the vehicle has a tendency to pitch, i.e., one of the front and rear sides of the hydraulic suspension system 1000 is compressed, such as the front left and rear right shock absorber assemblies are compressed, oil in the lower chamber 2012 of the front left shock absorber assembly 2 flows into the upper chamber 2011 of the rear left shock absorber assembly 2 through the second line, and oil in the lower chamber 2012 of the front right shock absorber assembly 2 flows into the upper chamber 2011 of the rear right shock absorber assembly 2 through the fourth line, so that the pistons of the rear left shock absorber assembly 2 and the rear right shock absorber assembly 2 are lowered, thereby causing the rear left shock absorber assembly and the rear right shock absorber assembly to also be compressed, which in turn is kept consistent from front to rear to avoid continued pitching of the vehicle.

It will of course be appreciated that the above description of the flow path of oil is merely exemplary to illustrate the anti-pitch principle by which the hydraulic suspension system 1000 may provide an anti-pitch force when the rear side is compressed and the front side is extended.

According to the hydraulic suspension system 1000 of the embodiment of the invention, when the vehicle is inclined in pitching, an anti-pitching force can be provided to prevent the vehicle from continuing pitching, so that not only can the riding comfort of the vehicle be enhanced, but also the running stability and safety of the vehicle can be improved.

Further, as shown in fig. 1 to 11, the first pipeline is communicated with the third pipeline through the first connecting pipeline to form a first loop, and the second pipeline is communicated with the fourth pipeline through the second connecting pipeline to form a second loop. Therefore, by forming the first loop and the second loop, the linkage adjustment of the right front shock absorber assembly 2, the right rear shock absorber assembly 2, the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 can be realized, and the pitching moment can be further ensured to be provided to prevent the vehicle from continuing pitching.

In a further embodiment of the invention, as shown in fig. 1-11, the hydraulic suspension system 1000 further comprises a first regulating accumulator 16 and a second regulating accumulator 17, the first regulating accumulator 16 being connected to the first circuit, the oil inlet and outlet of the first regulating accumulator 16 being provided with a first regulating valve 20. The second regulating accumulator 17 is connected to the second circuit, and the oil inlet and outlet of the second regulating accumulator 17 is provided with a second regulating valve 21. It should be noted that the first adjusting accumulator 16 and the second adjusting accumulator 17 may perform an energy storage function, that is, oil may flow into the first adjusting accumulator 16 and the second adjusting accumulator 17 to store energy, and when the hydraulic suspension system 1000 is needed, the oil in the first adjusting accumulator 16 and the second adjusting accumulator 17 is discharged to be replenished. In particular, the first and second regulating accumulators 16, 17 may be diaphragm accumulators, which may achieve a higher pressure accumulation in a shorter time, and the principles of the diaphragm accumulators are known in the art and will not be described in detail herein.

Wherein by controlling the open-closed states of the first regulator valve 20 and the second regulator valve 21, the rigidity of the hydraulic suspension system 1000 can be adjusted, for example, when the first regulator valve 20 and the second regulator valve 21 are closed, the first regulator accumulator 16 and the first circuit are disconnected, and the second regulator accumulator 17 and the second circuit are disconnected, the rigidity of the hydraulic suspension system 1000 can be increased.

In some embodiments of the present invention, as shown in fig. 1 and 2, a first on-off valve 22 for turning on or off the first connection pipe is provided, and a second on-off valve 23 for turning on or off the second connection pipe is provided. That is, when the first on-off valve 22 is closed, the first pipe and the third pipe are turned off and when the second on-off valve 23 is closed, the second pipe and the fourth pipe are turned off and on, so that it can be determined whether or not it is necessary to link the plurality of damper assemblies 2 according to actual demands.

As shown in fig. 3-11, in some embodiments of the present invention, the hydraulic suspension system 1000 further includes a central control cylinder 24, wherein the central control cylinder 24 includes a second cylinder body 240 and a moving member 241, the moving member 241 is movably disposed within the second cylinder body 240 and cooperates with the second cylinder body 240 to define a first chamber 243, a second chamber 244, a third chamber 245 and a fourth chamber 246, the first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246 are sequentially arranged in a moving direction of the moving member 241, the first chamber 243 and the second chamber 244 are distributed at one side of a middle contact portion 2411 of the moving member 241, the third chamber 245 and the fourth chamber 246 are distributed at the other side of the middle contact portion 2411, and the middle contact portion 2411 is in moving cooperation with an inner wall of the second cylinder body 240.

The lower chamber 2012 of the front left shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244 and the lower chamber 2012 of the rear right shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The lower chamber 2012 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246 and the lower chamber 2012 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For convenience of description, the principle is described below by taking the example that the lower chamber 2012 of the left front shock absorber assembly 2 is connected to the first chamber 243, the lower chamber 2012 of the right rear shock absorber assembly 2 is connected to the second chamber 244, the lower chamber 2012 of the left rear shock absorber assembly 2 is connected to the third chamber 245, and the lower chamber 2012 of the right front shock absorber assembly 2 is connected to the fourth chamber 246.

Specifically, when the vehicle has a roll tendency, for example, the piston rods 203 of the front left damper assembly 2 and the rear left damper assembly 2 are compressed, the piston rods 203 of the front right damper assembly 2 and the rear right damper assembly 2 are stretched, and at this time, the oil in the lower chamber 2012 of the front left damper assembly 2 is discharged to the first chamber 243, the oil in the lower chamber 2012 of the rear left damper assembly 2 is discharged to the third chamber 245, and since the first chamber 243 and the third chamber 245 are located on both sides of the intermediate contact portion 2411, the direction of the force of the oil in the first chamber 243 against the intermediate contact portion 2411 is opposite to the direction of the force of the third chamber 245 against the intermediate contact portion 2411, and the opposite forces cancel each other to make the moving member 241 not move, so that the movement of the piston rods 203 of the front left damper assembly 2 and the piston rods 203 of the rear left damper assembly 2 can be suppressed.

When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is raised such that the compression amplitude of the left front shock absorber assembly 2 is greater than the compression amplitude of the left rear shock absorber assembly 2, the amount of oil discharged from the left front shock absorber assembly 2 into the first chamber 243 is greater than the amount of oil discharged from the left rear shock absorber assembly 2 into the third chamber 245, so that the moving member 241 moves rightward to press the third chamber 245 and the fourth chamber 246, the oil in the third chamber 245 can be discharged into the lower chamber 2012 of the left rear shock absorber assembly 2 so that the piston rod 203 moves upward to raise the vehicle body, and the oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2 so that the piston rod 203 moves upward to raise the vehicle body, thereby reducing the risk of the left rear wheel and the right front wheel being lifted off the ground and increasing the vehicle stability.

It will of course be appreciated that the above description is merely exemplary and that when the vehicle encounters other conditions, such as right front wheel elevation, left rear wheel elevation, etc., oil flows according to the above described linkage principles to avoid roll of the vehicle, each of which will not be described in detail herein.

In some embodiments of the invention, in the initial state, the central control cylinder 24 is symmetrically disposed about the intermediate contact 2411. That is, in the initial state, the first area defined by the first chamber 243 and the second chamber 244 has the same volume as the second area defined by the third chamber 245 and the fourth chamber 246, so that when a roll tendency is encountered during the running of the vehicle, a rapid response is possible, avoiding the occurrence of a roll of the vehicle. The above-described "initial state" refers to a state in which the vehicle is running smoothly (i.e., the front left shock absorber assembly 2, the front right shock absorber assembly 2, the rear right shock absorber assembly 2, and the piston rod 203 of the rear left shock absorber assembly 2 are located at the same height) or in which the vehicle is not running.

In a further embodiment of the present invention, as shown in fig. 1-13, a through hole 204 is formed in the piston rod 203, the through hole 204 penetrating the piston rod 203 to communicate the lower chamber 2012 with the central control cylinder 24. That is, the oil in the lower chamber 2012 is discharged to the central control cylinder 24 through the through hole 204 in the piston rod 203, or the oil in the central control cylinder 24 is discharged to the lower chamber 2012 through the through hole 204 in the piston rod 203, so that the weight of the shock absorber 200 can be reduced by providing the through hole 204 in the piston rod 203 to realize the entry and exit of the oil into and from the lower chamber 2012. Because the top end of the piston rod 203 is connected to the vehicle body (i.e. the top end of the piston rod 203 is relatively fixed with the position of the vehicle body), the top end of the piston rod 203 is connected with the central control cylinder 24 through an oil path, the connection of the oil path is relatively stable, the situation of abrasion and the like caused by vibration is avoided as much as possible, the discharge or the discharge of oil liquid is more stable, and the unstable in and out of the oil liquid caused by the shaking of the vehicle body is avoided.

In some embodiments of the present invention, as shown in fig. 1-11, the hydraulic suspension system further includes a fluid supply circuit having a first branch, a second branch, a third branch, and a fourth branch, which are respectively in communication with the first chamber 243, the fourth chamber 246, the third chamber 245, and the second chamber 244, and the fluid is circulated between the lower chamber 2012 of the shock absorber 200 and the fluid supply circuit via the central control cylinder 24. It will be appreciated that the fluid supply circuit is connected to a reservoir through which fluid in the reservoir is discharged to the lower chamber 2012 of the shock absorber 200 and the central control cylinder 24, respectively. Thus, an oil circuit circulation can be formed, and the oil can enter or exit the central control cylinder 24, so that the moving member 241 of the central control cylinder 24 can reliably move.

Further, as shown in fig. 3 to 11, the first branch is provided with a first control valve 3, the second branch is provided with a second control valve 4, the third branch is provided with a third control valve 5, and the fourth branch is provided with a fourth control valve 6. That is, the first control valve 3 may control the on-off of the first branch, the second control valve 4 may control the on-off of the second branch, the third control valve 5 may control the on-off of the third branch, and the fourth control valve 6 may control the on-off of the fourth branch, so that whether to supply oil into the central control cylinder 24 and the lower chamber 2012 of the shock absorber 200 may be controlled by controlling the operation states of the first control valve 3 to the fourth control valve 6. It will be appreciated that when the first to fourth control valves 3 to 6 are in the closed condition, and when the vehicle has a roll tendency, oil may flow through the respective branches in the lower chamber 2012 and the respective chambers of the central control cylinder 24, so that the four damper assemblies 2 are linked, and the body height may be adjusted to reduce the magnitude of the vehicle inclination, avoiding the occurrence of roll.

As shown in fig. 2 and 4-11, in some embodiments of the invention, a fifth control valve 7 is provided between the first branch and the second branch, and a sixth control valve 8 is provided between the third branch and the fourth branch.

Specifically, when the fifth control valve 7 is opened, the first branch and the second branch communicate, and the lower chamber 2012 of the left front shock absorber assembly 2 and the lower chamber 2012 of the right front shock absorber assembly 2 communicate; when the fifth control valve 7 is closed, the first branch and the second branch are disconnected, and the lower chamber 2012 of the left front shock absorber assembly 2 and the lower chamber 2012 of the right front shock absorber assembly 2 are not communicated with each other. When the sixth control valve 8 is opened, the third branch and the fourth branch are communicated, and the lower chamber 2012 of the left rear shock absorber assembly 2 and the lower chamber 2012 of the right rear shock absorber assembly 2 are communicated; when the sixth control valve 8 is closed, the third branch and the fourth branch are not communicated with each other, and the lower chamber 2012 of the left rear shock absorber assembly 2 and the lower chamber 2012 of the right rear shock absorber assembly 2 are not communicated with each other.

When the height of the vehicle body needs to be maintained, the hydraulic suspension system 1000 can be switched into a height maintaining mode, the fifth control valve 7 and the sixth control valve 8 are opened, the first branch and the second branch are communicated, and the lower chamber 2012 of the front left shock absorber assembly 2 and the lower chamber 2012 of the front right shock absorber assembly 2 are communicated; the lower chamber 2012 of the left rear shock absorber assembly 2 and the lower chamber 2012 of the right rear shock absorber assembly 2 communicate. That is, the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are in a linked state, and the piston rod 203 of the left rear shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 are in a linked state, so that the vehicle body can maintain the current height as much as possible.

In some embodiments of the present invention, as shown in fig. 14, the moving member 241 includes a moving body portion 2410, the middle contact portion 2411 is an annular protrusion provided on the moving body portion 2410, and in the moving direction of the moving member 241, a middle cavity, a left cavity and a right cavity are provided in the second cylinder 240, and an entrance of the left cavity and an entrance of the right cavity are located on an inner wall of the middle cavity. The left end of the moving body portion 2410 extends into the left cavity through the inlet of the left cavity, and the right end of the moving body portion 2410 extends into the right cavity through the inlet of the right cavity.

The moving body portion 2410 defines a first chamber 243 between the left end and the left cavity, a portion of the moving body portion 2410 is slidably engaged with the inner wall of the left cavity, the intermediate contact portion 2411 is slidably engaged with the inner wall of the intermediate cavity to define a second chamber 244 and a third chamber 245, and the moving body portion 2410 defines a fourth chamber 246 between the right end and the right cavity. Thereby making the structure of the central control cylinder 24 simple.

Further, as shown in fig. 14, the central control cylinder 24 further includes a first return spring 247 and a second return spring 248, both ends of the first return spring 247 are respectively stopped at left ends of the second cylinder 240 and the moving member 241, both ends of the second return spring 248 are respectively stopped at right ends of the second cylinder 240 and the moving member 241, 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 vehicle is rolling such that the moving member 241 moves leftward, the first return spring 247 may push the moving member 241 rightward such that the moving member 241 is returned. When the vehicle is rolling such that the moving member 241 moves to the right, the second return spring 248 may push the moving member 241 to the left such that the moving member 241 is returned, so that the reliability of the central control cylinder 24 may be ensured.

In some examples of the invention, as shown in fig. 14, the central control cylinder 24 includes a guide assembly 249, the wire assembly includes a first guide 2490 and a second guide 2491, the first guide 2490 and the second guide 2491 are slidably engaged, the first guide 2490 is fixed to the second cylinder 240, the second guide 2491 is fixed to the moving part 241, the first return spring 247 is sleeved on the left guide assembly 249 and the first return spring 247 is stopped on the first guide 2490, the second return spring 248 is sleeved on the right guide assembly 249 and the second return spring 248 is stopped on the first guide 2490, thereby facilitating not only the assembly of the first return spring 247 and the second return spring 248 but also limiting the degree of deformation of the first return spring 247 and the second return spring 248 by providing the guide assembly 249, and avoiding failure due to excessive deformation of the first return spring 247 and the second return spring 248.

Further, the second guide 2491 is a screw, and one end of the second guide 2491 extends into the first guide 2490 to be movably matched with the first guide 2490, so that the guide assembly 249 is simple and reliable in structure.

As shown in fig. 15, the ports of the central control cylinder 24 connected to the piston rods 203 of the four damper assemblies 2 are located on the same side, thereby facilitating piping connection.

As shown in fig. 1-11, in some embodiments of the present invention, each set of damper assemblies 2 includes a damper spring 205, with both ends of the damper spring 205 being adapted to be coupled to a vehicle body and an axle. Thus, by providing the damper springs 205, the cushioning effect of each set of damper assemblies 2 can be increased, and the jolt of the vehicle body during the running of the vehicle can be reduced.

Further, as shown in fig. 1 to 11, the damper springs 205 of the front left damper assembly 2 are externally fixed to the damper 200, the damper springs 205 of the front right damper assembly 2 are externally fixed to the damper 200, the damper springs 205 of the rear left damper assembly 2 are juxtaposed to the damper 200, and the damper springs 205 of the rear right damper assembly 2 are juxtaposed to the damper 200.

As shown in fig. 1-11, in some embodiments of the present invention, each shock absorber assembly 2 is provided with a pressure relief accumulator 30, each pressure relief accumulator 30 being in communication with a respective through bore 204. Therefore, in the running process of the vehicle, if the vehicle is subjected to conditions such as jounce and impact, the oil in the lower chamber 2012 of each shock absorber assembly 2 can enter the decompression energy accumulator 30 through the through hole 204 to store energy, so that the purpose of quick decompression is realized.

As shown in fig. 1-13, in some embodiments of the present invention, a through hole 204 is provided in the piston rod 203, the through hole 204 being in communication with the lower chamber 2012. The hydraulic suspension system 1000 further comprises a liquid storage pot 1, the liquid storage pot 1 is connected with the through hole 204 of the left front shock absorber assembly 2 through a first branch, the liquid storage pot 1 is connected with the through hole 204 of the right front shock absorber assembly 2 through a second branch, the liquid storage pot 1 is connected with the through hole 204 of the left rear shock absorber assembly 2 through a third branch, the liquid storage pot 1 is connected with the through hole 204 of the right rear shock absorber assembly 2 through a fourth branch, a first control valve 3 for switching on or switching off the liquid storage pot 1 is arranged on the first branch, a second control valve 4 for switching on or switching off the liquid storage pot is arranged on the second branch, a third control valve 5 for switching on or switching off the liquid storage pot 1 is arranged on the third branch, and a fourth control valve 6 for switching on or switching off the liquid storage pot 1 is arranged on the fourth branch.

That is, when the corresponding control valve of each group of damper assemblies 2 closes the corresponding branch, the flow passage between the reservoir 1 and the through hole 204 of the corresponding damper assembly 2 is disconnected, and the oil in the reservoir 1 does not flow into the corresponding damper 200, and the oil in the damper 200 does not flow into the reservoir 1.

Specifically, the hydraulic suspension system 1000 has a lifting mode in which oil can enter the through hole 204 of the front left shock absorber assembly 2, the through hole 204 of the front right shock absorber assembly 2, the through hole 204 of the rear left shock absorber assembly 2, and the through hole 204 of the rear right shock absorber assembly 2, and hydraulic oil entering each through hole 204 flows into the lower chamber 2012, so that the hydraulic pressure in the lower chamber 2012 increases to move the piston 202 upward, and the piston 202 moves upward to drive the piston rod 203 to move upward.

The piston rod 203 of the left front shock absorber assembly 2 moves upwards, the piston rod 203 of the right front shock absorber assembly 2 moves upwards, the piston rod 203 of the left rear shock absorber assembly 2 moves upwards and the piston rod 203 of the right rear shock absorber assembly 2 moves upwards to drive the vehicle body to move upwards, so that the purpose of lifting the vehicle body is achieved.

In the height lowering mode, oil may flow out from the through hole 204 of the left front damper assembly 2, the through hole 204 of the right front damper assembly 2, the through hole 204 of the left rear damper assembly 2, and the through hole 204 of the right rear damper assembly 2, respectively, to be discharged to the sump 1, and the hydraulic pressure of the lower chamber 2012 of each damper 200 is reduced such that the piston 202 moves downward, and the piston 202 moves downward to drive the piston rod 203 to move downward. The piston rod 203 of the left front shock absorber assembly 2 moves downwards, the piston rod 203 of the right front shock absorber assembly 2 moves downwards, the piston rod 203 of the left rear shock absorber assembly 2 moves downwards and the piston rod 203 of the right rear shock absorber assembly 2 moves downwards to drive the vehicle body to move downwards, so that the aim of reducing the height of the vehicle body is fulfilled.

The vehicle can meet various road conditions in the running process, and the suspension system of the vehicle in the related art can not be adjusted in the running process of the vehicle after being selected, so that the traditional suspension can only ensure that the vehicle can achieve optimal matching of performance under a specific road and speed condition, can only passively bear the acting force of the vehicle body, can not change suspension parameters according to the different road and vehicle speed, and can not actively control the acting force of the vehicle body.

According to the hydraulic suspension system 1000 of the embodiment of the invention, the height of the vehicle body can be adjusted according to road conditions and the like, for example, when the vehicle passes over a rough mountain road, the vehicle can enter a lifting mode, the mass center of the vehicle can be improved, and the running stability of the vehicle is improved. When it is desired to reduce the influence of the vehicle body on the running speed, a height lowering mode may be entered such that the center of mass of the vehicle is lowered. It will of course be appreciated that the foregoing is merely exemplary, and that the height of the vehicle body may be adjusted according to actual needs during travel.

According to the hydraulic suspension system 1000 of the embodiment of the invention, the height of the vehicle body can be adjusted, the operation stability of the vehicle can be improved on the premise of not damaging the comfort of the vehicle, and the contradiction between the comfort of the vehicle and the operation stability is effectively solved. Meanwhile, the hollow piston rod 203 is adopted, so that the weight can be reduced, the oil liquid is discharged or discharged by utilizing the through hole 204 defined by the hollow piston rod 203 to adjust the position of the piston rod 203, the adjusting mode is simple, the reliability is high, the cost is low, and the corresponding speed is high.

As shown in fig. 1-11, in some embodiments of the present invention, the reservoir 1 has a liquid outlet and a liquid inlet, and the hydraulic suspension system 1000 further includes a control pump 26 and an oil return valve 27, wherein the control pump 26 is connected to the liquid outlet, and the control valve 26 is respectively connected to the first branch to the fourth branch to guide the oil in the reservoir 1 to the first branch to the fourth branch. The oil return valve 27 is connected with the liquid inlet and the first to fourth branches respectively, and when the oil return valve 27 is opened, oil flows to the liquid inlet from at least one of the first to fourth branches. That is, the reservoir 1 has separate return and discharge passages, and when discharge is required, such as in a lifting mode, the control pump 26 is turned on and the return valve 27 is turned off, and the control pump 26 directs oil to each set of damper assemblies 2. When a return is required, for example in a height lowering mode, the control pump 26 is closed and the return valve 27 is opened, the oil flowing from each group of damper assemblies 2 can flow to the reservoir 1 through the return valve 27. Therefore, by arranging two independent channels, the reliable proceeding of liquid outlet and liquid return is ensured.

In some examples of the invention, as shown in fig. 1-11, the control pump 26 includes a control valve body 260 and a drive motor 261, the drive motor 261 being electrically connected with a valve within the control valve body 260, the drive motor 261 rotating to control the valve rotation to effect opening or closing of the control pump 26. Therefore, the control pump 26 is opened or closed by adopting a mode of matching the driving motor 261 and the valve, the control pump 26 can be ensured to run reliably, and the influence of oil on the opening or closing of the control pump 26 is reduced.

Further, as shown in fig. 1-11, the hydraulic suspension system 1000 further includes a check valve 28, where the check valve 28 is disposed at the outlet end of the control pump 26 and is in unidirectional conduction, so that when the hydraulic suspension system returns, due to the existence of the check valve 28, the hydraulic suspension system can effectively avoid the hydraulic fluid flowing to the control pump 26, and avoid the hydraulic fluid flowing to the liquid outlet through the control pump 26 when the control pump 26 is unexpected.

In some embodiments of the present invention, as shown in fig. 1-11, the hydraulic suspension system 1000 further includes a pressure stabilizing accumulator 29, the pressure stabilizing accumulator 29 being disposed at the outlet end of the control pump 26, such that the pressure stabilizing accumulator 29 can stabilize pressure and eliminate flow fluctuations at the outlet end of the control pump 26.

In some examples of the invention, the pressure stabilizing accumulator 29 may be a metal bellows accumulator, as shown in fig. 16, which is composed of a cylinder assembly and a bellows assembly. The cylinder assembly comprises an upper cover, a sealing ring, a cylinder barrel, a clamping ring and a sealing ring; the bellows assembly comprises a sealing cover, a guide ring, a bellows and a lower cover. A metal bellows accumulator may replace a balloon or diaphragm, using metal bellows 101 as a flexible separation element between fluid and gas. The bellows can be used over a very wide temperature range. The metal bellows is welded to the other components and is thus completely airtight. It can move up and down inside the accumulator without any friction or wear and can run for a long time with only one adjustment.

According to some embodiments of the present invention, as shown in fig. 1-11, the hydraulic suspension system 1000 further includes a relief valve 31, where the relief valve 31 is located at the outlet port of the control pump 26, and when the outlet pressure of the control pump 26 reaches a certain threshold value, the relief valve 31 is opened to relieve pressure, so as to protect the hydraulic suspension system 1000 in a normal pressure range. The operation principle of the relief valve 31 is already known, and will not be described in detail here.

In some embodiments of the present invention, as shown in fig. 1 to 11, each of the first through fourth branches is provided with an opening degree adjusting valve 80 for adjusting the flow rate thereof. That is, the opening adjusting valve 80 can adjust the oil flow of the corresponding branch, so that the damping of the corresponding branch can be adjusted, and the purpose of adjusting the damping of the hydraulic suspension system 1000 is achieved, so that the damping of the hydraulic suspension system 1000 can be adjusted according to the actual situation, for example, the damping of the hydraulic suspension system 1000 can be adjusted according to road conditions, and the like, so that the damping of the hydraulic suspension system 1000 can meet the vibration reduction requirement, and the contradiction between the vehicle comfort and the steering stability is effectively solved. In some examples of the invention, the opening adjustment valve 80 includes a first motor and a first valve body, where the first motor can control movement of a valve within the first valve body to vary a flow area of the first valve body for purposes of adjusting flow.

In some embodiments of the present invention, a damping adjustment branch is provided between the central control cylinder 21 and the lower chamber 2012, and an opening adjustment valve 80 is provided on the damping adjustment branch, and the hydraulic suspension system 1000 further includes a damping adjustment accumulator 9, with which the damping adjustment accumulator 9 communicates. Specifically, each group of damper assemblies 2 is provided with one damping adjustment accumulator 9, and the opening adjustment valve 80 is located between the damping adjustment accumulator 9 and the lower chamber 2012. That is, the damping adjustment accumulator 9 can store energy, and when the opening of the opening adjustment valve 80 is reduced so that the amount of oil through which the branch can circulate is reduced, the passage in the shock absorber that flows to the damping adjustment branch is narrowed, and the damping of the shock absorber is increased. When the opening of the opening regulating valve 80 is increased, the channel flowing into the damping regulating branch in the shock absorber is widened at the moment, and the damping of the shock absorber is reduced, so that the reliability of damping adjustment of the hydraulic suspension system 1000 is ensured through the joint cooperation of the damping regulating accumulator 9 and the opening regulating valve 80, and the oil liquid quantity flowing in the branch is ensured to be matched with the required damping.

In some embodiments of the present invention, as shown in fig. 1 and 3, the accumulator module includes stiffness adjustment accumulators 10, each group of shock absorber assemblies 2 is provided with one stiffness adjustment accumulator 10 correspondingly, the stiffness adjustment accumulators 10 are connected with the branches, the oil inlet and outlet of the stiffness adjustment accumulators 10 are provided with stiffness adjustment valves 11, and the first control valve 3 to the fourth control valve 6 are located between the corresponding stiffness adjustment accumulator 10 and the liquid storage pot 1. Specifically, when the stiffness adjustment valve 11 is opened and the first to fourth control valves 3 to 6 are all opened, the oil in the reservoir tank 1 may enter the stiffness adjustment accumulator 10 to be stored, and when the first to fourth control valves 3 to 6 are all closed and the stiffness adjustment valve 11 is opened, the oil in each stiffness adjustment accumulator 10 may be discharged to the through hole 204 in the corresponding shock absorber assembly 2, so that the piston rod 203 rises. When the rigidity needs to be improved, the first control valve 3 to the fourth control valve 6 are closed and the rigidity-adjusting valve 11 is closed, so that the rigidity-adjusting accumulator 10 is disconnected from the corresponding shock absorber 200, and the suspension rigidity is improved.

It will be appreciated that each stiffness adjustment valve 11 may be independently adjustable so that the stiffness of the front and rear sides of the hydraulic suspension system 1000 may be made non-uniform to meet different operating conditions. For example, in the anti-nodding and anti-roll turning conditions of the vehicle, the front axle is required to provide greater rigidity, so that the rigidity adjusting valves 11 corresponding to the front left and right damper assemblies 2 and 2 can be closed, and the rigidity adjusting valves 11 corresponding to the rear right and left damper assemblies 2 and 2 can be opened.

In some examples of the invention, the damping adjustment accumulator 9 is a metal bellows accumulator, and the stiffness adjustment accumulator 10 is a diaphragm accumulator having a faster pressure accumulating capacity and a greater pressure accumulating amount than the metal bellows accumulator. The diaphragm accumulator can achieve higher pressure accumulation in a shorter time, so the rigidity-adjusting accumulator 10 adopts the diaphragm accumulator to accumulate pressure of each suspension, thereby realizing the lifting of the vehicle body. It should be noted that, the energy storage principles of the metal bellows energy storage device and the diaphragm energy storage device are all the prior art, and will not be described in detail here.

In some embodiments of the invention, as shown in fig. 1, a seventh control valve 12 is provided on the branch for turning it on or off, the seventh control valve 12 being located between the rigidity-adjusting accumulator 10 and the through hole 204. Specifically, the hydraulic suspension system 1000 may have a booster mode in which the first to fourth control valves 3 to 6 are all opened, the seventh control valve 12 is closed, and the rigidity-adjusting valve 11 is opened, and the oil in the reservoir 1 enters the rigidity-adjusting accumulator 10 to be stored.

When the switching to the lifting mode is required, the first to fourth control valves 3 to 6 are closed, the seventh control valve 12 is opened, and the rigidity-adjusting valve 11 is opened, and the oil in the rigidity-adjusting accumulator 10 enters into the through hole 204 to raise the piston 202.

When it is necessary to switch to the height lowering mode, the first to fourth control valves 6 to 6 are opened, the seventh control valve 12 is opened, and the rigidity adjusting valve 11 is closed, and the oil discharged from the through hole 204 of the shock absorber 200 flows back into the reservoir 1. Therefore, by arranging the seventh control valve 12, the rigidity adjusting valve 11 can be firstly stored, and when lifting or rigidity adjustment is needed, the rigidity adjusting valve 11 can be opened or closed, so that the response speed is high and reliable.

Further, the hydraulic suspension system 1000 may further have a brake anti-nodding and an acceleration anti-lifting mode, during running of the vehicle, one of the first to fourth control valves corresponding to each set of damper assemblies 2 may be controlled to be closed, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is closed, the through hole 204 of each set of damper assemblies 2 is communicated with the damping adjustment accumulator 9, and the damping adjustment accumulator 9 may adjust the oil amount in the corresponding damper 200. The shock absorbers 200 corresponding to each set of shock absorber assemblies 2 thus have a reaction force to the movement tendency of the vehicle body at the corresponding position, so that the hydraulic suspension system 1000 has a brake anti-nodding and an acceleration anti-lifting mode.

As shown in fig. 2, 4-11, in some embodiments of the invention the accumulator module comprises a central accumulator 13, the first 3 to fourth 6 control valves being connected to the central accumulator 13, respectively. That is, when the first to fourth control valves 3 to 6 are closed, the oil in the reservoir 1 may enter the central accumulator 13 to be stored. 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 through holes 204 of each group of shock absorber assemblies 2, so that by arranging the central accumulator 13, the supercharging energy storage can be performed first, the oil can reliably flow into each group of shock absorber assemblies 2, and the damping system and the rigidity coefficient of the hydraulic suspension system 1000 can be further adjusted conveniently.

1-11, It is to be understood that each of the foregoing embodiments is merely exemplary and not limiting, and that each embodiment may be modified in an exemplary manner, as appropriate.

Example 1:

as shown in fig. 1, a hydraulic suspension system 1000 according to an embodiment of the present invention includes a front left shock absorber assembly 2, a front right shock absorber assembly 2, a rear left shock absorber assembly 2, a rear right shock absorber assembly 2, a reservoir tank 1, a control pump 26, an oil return valve 27, a check valve 28, a pressure stabilizing accumulator 29, a relief valve 31, and an opening degree adjusting valve 80, a damping adjusting accumulator 9, a rigidity adjusting accumulator 10, and a pressure reducing accumulator 30.

The left front damper assembly 2 and the right front damper assembly 2 each include a damper 200 and a damper spring 205, and the damper spring 205 is externally fixed to the damper 200. The left rear shock absorber assembly 2 and the right rear shock absorber assembly 2 both comprise a shock absorber 200 and a shock absorber spring 205, the shock absorber spring 205 and the shock absorber 200 are arranged in parallel, and two ends of the shock absorber spring 205 of the left rear shock absorber assembly 2 are respectively connected with a vehicle body and an axle. The damper springs 205 of the rear right damper assembly 2 are connected at both ends to the vehicle body and the axle, respectively. Each shock absorber 200 includes a first cylinder 201, a piston rod 203, and a piston 202, the piston rod 203 being connected to the piston 202, the piston 202 being movably disposed within the first cylinder 201 to define an upper chamber 2011 and a lower chamber 2012, a through-hole 204 being provided in the piston rod 203, the through-hole 204 being in communication with the lower chamber 2012.

The through hole 204 of the front left shock absorber assembly 2 is connected with the liquid storage kettle 1 through a first branch, the first branch is connected with a first control valve 3 in series, the through hole 204 of the front right shock absorber assembly 2 is connected with the liquid storage kettle 1 through a second branch, the second branch is connected with a second control valve 4 in series, the through hole 204 of the rear left shock absorber assembly 2 is connected with the liquid storage kettle 1 through a third branch, the third branch is connected with a third control valve 5 in series, the through hole 204 of the rear right shock absorber assembly 2 is connected with the liquid storage kettle 1 through a fourth branch, and the fourth branch is connected with a fourth control valve 6 in series.

The hydraulic suspension system 1000 includes a common flow path and four branch flow paths, the common flow path and the plurality of branch flow paths cooperatively defining a first branch path to a fourth branch path, the four branch flow paths being connected to the through holes 204 of the plurality of damper assemblies 2, respectively. The check valve 28 and the return valve 27 are connected to a common flow path, respectively. The relief valve 31 is connected to the common flow path.

The liquid storage pot 1 is provided with a liquid outlet and a liquid inlet, and the control pump 26 is respectively connected with the liquid outlet and the public flow path to guide the oil in the liquid storage pot 1 to the first branch to the fourth branch. When the oil return valve 27 is opened, oil flows from the common flow path to the oil intake. A one-way valve 28 is provided at the outlet end of the control pump 26 and is one-way in conduction. A pressure stabilizing accumulator 29 is provided at the outlet end of the control pump 26 between the check valve 28 and the control pump 26, the pressure stabilizing accumulator 29 stabilizing and eliminating flow fluctuations at the outlet end of the control pump 26.

The corresponding rigidity-adjusting accumulator 10 of each shock absorber assembly 2 is connected to the corresponding branch flow path, the oil inlet and outlet of the rigidity-adjusting accumulator 10 is provided with a rigidity-adjusting valve 11, and the rigidity-adjusting valve 11 is in a normally closed state.

Each branch flow path is further provided with an opening degree adjusting valve 80, a damping adjusting accumulator 9, and a seventh control valve 12, the opening degree adjusting valve 80 being used to adjust the flow rate flowing through the corresponding branch flow path to adjust the damping of the hydraulic suspension system 1000. The damping adjustment accumulator 9 can store energy. A seventh control valve 12 is arranged between the damping adjustment accumulator 9 and the stiffness adjustment accumulator 10.

Each shock absorber assembly 2 is provided with a pressure reducing accumulator 30, the pressure reducing accumulator 30 corresponding to the front left shock absorber assembly 2 is directly connected with the piston rod 203 to be communicated with the corresponding through hole 204, and the pressure reducing accumulator 30 corresponding to the front right shock absorber assembly 2 is directly connected with the piston rod 203 to be communicated with the corresponding through hole 204. The pressure-reducing accumulators 30 corresponding to the left rear shock absorber assembly 2 are connected to the respective branch passages, and the pressure-reducing accumulators 30 corresponding to the right rear shock absorber assembly 2 are directly connected to the respective branch passages.

Specifically, the hydraulic suspension system 1000 has a booster mode in which the first to fourth control valves 3 to 6 are all opened and the seventh control valve 12 is closed, a lift mode, a height lowering mode, and an anti-pitching mode, and the stiffness adjustment valve 11 is opened, and the control pump 26 is operated such that the oil in the reservoir 1 flows into the corresponding stiffness adjustment accumulator 10 through the four branch flow paths, respectively, to store energy. The rigidity-adjusting valve 11 is closed after each rigidity-adjusting accumulator 10 is charged.

In the lifting mode, oil in the liquid storage pot 1 or oil in the energy accumulator can enter the through hole 204 of the left front shock absorber assembly 2, the through hole 204 of the right front shock absorber assembly 2, the through hole 204 of the left rear shock absorber assembly 2 and the through hole 204 of the right rear shock absorber assembly 2, hydraulic oil entering into each through hole 204 flows into the lower chamber 2012, so that the hydraulic pressure in the lower chamber 2012 is increased to enable the piston 202 to move upwards, and the piston 202 moves upwards to drive the piston rod 203 to move upwards. The piston rod 203 of the left front shock absorber assembly 2 moves upwards, the piston rod 203 of the right front shock absorber assembly 2 moves upwards, the piston rod 203 of the left rear shock absorber assembly 2 moves upwards and the piston rod 203 of the right rear shock absorber assembly 2 moves upwards to drive the vehicle body to move upwards, so that the purpose of lifting the vehicle body is achieved.

In the height lowering mode, oil may flow out of the through hole 204 of the front left shock absorber assembly 2, the through hole 204 of the front right shock absorber assembly 2, the through hole 204 of the rear left shock absorber assembly 2, and the through hole 204 of the rear right shock absorber assembly 2, respectively, and the hydraulic pressure of the lower chamber 2012 of each shock absorber 200 is reduced so that the piston 202 moves downward, and the piston 202 moves downward to drive the piston rod 203 to move downward. The piston rod 203 of the left front shock absorber assembly 2 moves downwards, the piston rod 203 of the right front shock absorber assembly 2 moves downwards, the piston rod 203 of the left rear shock absorber assembly 2 moves downwards and the piston rod 203 of the right rear shock absorber assembly 2 moves downwards to drive the vehicle body to move downwards, so that the aim of reducing the height of the vehicle body is fulfilled. It will be appreciated that in the height lowering mode, oil discharged from each set of damper assemblies 2 may be discharged directly to the reservoir 1, or may be discharged to the accumulator for storage, or may be discharged to both the reservoir 1 and the accumulator.

When the pressure in the hydraulic suspension system 1000 is high, for example, the pressure at the outlet of the detection control pump 26 reaches a certain threshold (30 MPa), the oil return valve 27 is opened to release pressure so as to protect the hydraulic suspension system 1000 in a normal pressure range, and at this time, the oil in each shock absorber 200 can flow into the reservoir 1 through the branch and the oil return valve 27.

If the pressure within the hydraulic suspension system 1000 is still high or the pressure during operation is high after the pressure relief, the relief valve 31 may be used to open for pressure relief to ensure reliable operation of the entire hydraulic suspension system 1000.

In the running process of the vehicle, if the damping of the hydraulic suspension system 1000 is large, the vehicle body is bumpy and the comfort is affected, the damping of the hydraulic suspension system 1000 can be adjusted by adjusting the oil volume in each branch flow path through the opening adjusting valve 80, and when the opening of the opening adjusting valve 80 is reduced so that the volume of the oil which can flow through the branch is reduced, the channel which flows into the damping adjusting branch in the shock absorber is narrowed at this time, and the damping of the shock absorber is increased. When the opening degree of the opening degree adjusting valve 80 increases, the passage in the shock absorber flowing to the damping adjustment branch at this time becomes wider, and the damping of the shock absorber becomes smaller, so that the damping of the hydraulic suspension system 1000 can be reliably adjusted.

When the rigidity of the hydraulic suspension system 1000 greatly reduces the comfort of the vehicle, the rigidity-adjusting valve 11 can be controlled to open, and the oil in the rigidity-adjusting accumulator 10 can be supplemented into each branch flow path, so that the rigidity of the hydraulic suspension system 1000 can be reduced, and the cushioning effect of the hydraulic suspension system 1000 on jolt can be increased.

During the running process of the vehicle, if the vehicle is subjected to conditions such as jounce and impact, the oil in the lower chamber 2012 of each shock absorber assembly 2 can enter the decompression accumulator 30 through the through hole 204 to store energy, so that the purpose of quick decompression is realized. Since the front axle of the vehicle needs to ensure running stability and the rear axle of the vehicle mainly needs to ensure comfort, the pressure-reducing accumulator 30 corresponding to the front left shock absorber assembly 2 is directly connected with the piston rod 203 to be communicated with the corresponding through hole 204, and the pressure-reducing accumulator 30 corresponding to the front right shock absorber assembly 2 is directly connected with the piston rod 203 to be communicated with the corresponding through hole 204, so that rapid pressure relief can be realized.

The upper chamber 2011 of the front left shock absorber assembly 2 communicates with the lower chamber 2012 of the rear left shock absorber assembly 2 via a first conduit, and the lower chamber 2012 of the front left shock absorber assembly 2 communicates with the upper chamber 2011 of the rear left shock absorber assembly 2 via a second conduit.

The upper chamber 2011 of the front right damper assembly 2 communicates with the lower chamber 2012 of the rear right damper assembly 2 via a third conduit, and the lower chamber 2012 of the front right damper assembly 2 communicates with the upper chamber 2011 of the rear right damper assembly 2 via a fourth conduit. The first pipeline is communicated with the third pipeline through a first connecting pipeline to form a first loop, and the second pipeline is communicated with the fourth pipeline through a second connecting pipeline to form a second loop. The hydraulic suspension system 1000 further comprises a first regulating accumulator 16 and a second regulating accumulator 17, the first regulating accumulator 16 being connected to the first circuit, the oil inlet and outlet of the first regulating accumulator 16 being provided with a first regulating valve 20. The second regulating accumulator 17 is connected to the second circuit, and the oil inlet and outlet of the second regulating accumulator 17 is provided with a second regulating valve 21. The first connecting pipe is provided with a first on-off valve 22 for switching on or off the first connecting pipe, and the second connecting pipe is provided with a second on-off valve 23 for switching on or off the second connecting pipe.

Specifically, when the vehicle has a tendency to pitch, i.e., one of the front and rear sides of the hydraulic suspension system 1000 is compressed, for example, the piston rod 203 of the front left shock absorber assembly 2 and the piston rod 203 of the front right shock absorber assembly 2 are compressed, the piston rod 203 of the rear left shock absorber assembly 2 and the piston rod 203 of the rear right shock absorber assembly 2 are stretched, the oil in the lower chamber 2012 of the front left shock absorber assembly 2 flows into the upper chamber 2011 of the rear left shock absorber assembly 2 through the second pipe, and the oil in the lower chamber 2012 of the front right shock absorber assembly 2 flows into the upper chamber 2011 of the rear right shock absorber assembly 2 through the fourth pipe, so that the piston of the rear left shock absorber assembly and the piston of the rear right shock absorber assembly are both compressed, so that the rear left shock absorber assembly and the rear right shock absorber assembly are both compressed, so that the front and rear are in unison, whereby the hydraulic suspension system 1000 can provide an anti-pitch force to avoid the vehicle from continuing to pitch.

By forming the first loop and the second loop, the linkage adjustment of the front right shock absorber assembly 2, the rear right shock absorber assembly 2, the front left shock absorber assembly 2 and the rear left shock absorber assembly 2 can be realized, and further, the anti-pitching moment can be ensured to be provided to prevent the vehicle from continuing pitching. Wherein by controlling the open-closed states of the first regulator valve 20 and the second regulator valve 21, the rigidity of the hydraulic suspension system 1000 can be adjusted, for example, when the first regulator valve 20 and the second regulator valve 21 are closed, the rigidity of the hydraulic suspension system 1000 can be increased.

When the first on-off valve 22 is closed, the first pipeline and the third pipeline are disconnected and connected, and when the second on-off valve 23 is closed, the second pipeline and the fourth pipeline are disconnected and connected, so that whether a plurality of shock absorber assemblies 2 are required to be linked or not can be judged according to actual requirements.

Example 2:

As shown in fig. 2, in comparison with embodiment 1, the hydraulic suspension system 1000 according to the embodiment of the present invention is not provided with the rigidity-adjusting accumulator 10, and the hydraulic suspension system 1000 according to the embodiment of the present invention further includes the center accumulator 13, the first height-maintaining branch connected to the through hole 204 of the front left shock absorber assembly 2 and the through hole 204 of the front right shock absorber assembly 2, respectively (i.e., the first height-maintaining branch connected to the first control valve 3 and the second control valve 4, respectively), and the second height-maintaining branch provided with the fifth control valve 7 for turning on or off thereof.

The second height maintaining branch is respectively connected with the through hole 204 of the left rear shock absorber assembly 2 and the through hole 204 of the right rear shock absorber assembly 2 (namely, the second height maintaining branch is respectively connected with the third control valve 5 and the fourth control valve 6), and the sixth control valve 8 for switching on or switching off the second height maintaining branch is arranged on the second height maintaining branch.

Specifically, when the fifth control valve 7 is opened, the first height maintaining branch is turned on; the first height keeps the branch off when the fifth control valve 7 is closed. When the sixth control valve 8 is opened, the second height keeps the branch conductive; the second height keeps the branch off when the sixth control valve 8 is closed.

When the height of the vehicle body needs to be maintained, the hydraulic suspension system 1000 can be switched to enter a height maintaining mode, the fifth control valve 7 and the sixth control valve 8 are both opened, the first height maintaining branch and the second height maintaining branch are communicated, and the through hole 204 of the left front shock absorber assembly 2 is communicated with the through hole 204 of the right front shock absorber assembly 2; the through hole 204 of the left rear absorber assembly 2 communicates with the through hole 204 of the right rear absorber assembly 2. That is, the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are in a linked state, and the piston rod 203 of the left rear shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 are in a linked state, so that the vehicle body can maintain the current height as much as possible.

In the height maintaining mode, each of the first control valve 3 to the fourth control valve 6, the seventh control valve 12 is controlled to maintain a closed state.

In this embodiment, in the boost mode, each of the first to fourth control valves 3 to 6 is closed, and the oil in the reservoir 1 is discharged to the central accumulator 13 for accumulation.

Example 3:

As shown in fig. 3, in this embodiment, the hydraulic suspension system 1000 according to the embodiment of the invention further includes the central control cylinder 24, as compared to embodiment 1.

The central control cylinder 24 includes a second cylinder 240 and a moving member 241, the moving member 241 is movably disposed in the second cylinder 240 and cooperates with the second cylinder 240 to define a first chamber 243, a second chamber 244, a third chamber 245 and a fourth chamber 246, the first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246 are sequentially arranged in a moving direction of the moving member 241, the first chamber 243 and the second chamber 244 are distributed at one side of a middle contact portion 2411 of the moving member 241, the third chamber 245 and the fourth chamber 246 are distributed at the other side of the middle contact portion 2411, and the middle contact portion 2411 is movably mated with an inner wall of the second cylinder 240.

The through-hole 204 of the front left shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the through-hole 204 of the rear right shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The through-hole 204 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the through-hole 204 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For convenience of description, the principle will be described by taking an example in which the through hole 204 of the front left damper assembly 2 is connected to the first chamber 243, the through hole 204 of the rear right damper assembly 2 is connected to the second chamber 244, the through hole 204 of the rear left damper assembly 2 is connected to the third chamber 245, and the through hole 204 of the front right damper assembly 2 is connected to the fourth chamber 246.

Specifically, when the vehicle has a roll tendency, for example, the piston rods 203 of the front left damper assembly 2 and the rear left damper assembly 2 are compressed, the piston rods 203 of the front right damper assembly 2 and the rear right damper assembly 2 are stretched, at this time, the oil in the lower chamber 2012 of the front left damper assembly 2 is discharged to the first chamber 243 through the through hole 204, the oil in the lower chamber 2012 of the rear left damper assembly 2 is discharged to the third chamber 245 through the through hole 204, and since the first chamber 243 and the third chamber 245 are located on both sides of the intermediate contact portion 2411, the forces of the oil in the first chamber 243 against the intermediate contact portion 2411 are opposite to the forces of the third chamber 245 against the intermediate contact portion 2411, and the opposite forces cancel each other out so that the moving member 241 does not move, whereby the movement of the piston rods 203 of the front left damper assembly 2 and the piston rods 203 of the rear left damper assembly 2 can be suppressed.

It will be appreciated that the hydraulic suspension system 1000 of this embodiment also has the anti-pitching mode described in embodiment 1, and will not be described here again.

Example 4:

As shown in fig. 4 to 11, in this embodiment, the hydraulic suspension system 1000 according to the embodiment of the invention eliminates the rigidity-adjusting accumulator 10 as compared to embodiment 1, and the hydraulic suspension system 1000 according to the embodiment of the invention is provided with the center accumulator 13, the center control cylinder 24, the first height maintaining branch, and the second height maintaining branch.

The oil inlet and outlet of the central accumulator 13 is connected with a central accumulator regulating valve 32, and the central accumulator regulating valve 32 is connected to a common flow path.

The through-hole 204 of the front left shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the through-hole 204 of the rear right shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The through-hole 204 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the through-hole 204 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246.

The first height maintaining branch is connected with the through hole 204 of the left front shock absorber assembly 2 and the through hole 204 of the right front shock absorber assembly 2 respectively, and the fifth control valve 7 for switching on or off the first height maintaining branch is arranged on the first height maintaining branch.

The second height maintaining branch is connected with the through hole 204 of the left rear shock absorber assembly 2 and the through hole 204 of the right rear shock absorber assembly 2 respectively, and a sixth control valve 8 for switching on or off the second height maintaining branch is arranged on the second height maintaining branch.

Specifically, for convenience of description below, the principle is described by taking the example that the through hole 204 of the front left damper assembly 2 is connected to the first chamber 243, the through hole 204 of the rear right damper assembly 2 is connected to the second chamber 244, the through hole 204 of the rear left damper assembly 2 is connected to the third chamber 245, and the through hole 204 of the front right damper assembly 2 is connected to the fourth chamber 246.

Specifically, as shown in fig. 5, the hydraulic suspension system 1000 enters the supercharging mode, the central accumulator control valve 32 is opened, the first to fourth control valves 3 to 6 are closed, the fifth control valve 7 is closed, and the sixth control valve 8 is closed, and the oil flowing out of the reservoir tank 1 is discharged to the central accumulator 13 to be accumulated.

As shown in fig. 6, when the vehicle enters the lift mode, the center charge regulator valve 32 is opened, the first to fourth control valves 3 to 6 are opened, the fifth control valve 7 is closed, and the sixth control valve 8 is closed.

The oil discharged from the central accumulator 13 and/or the oil discharged from the reservoir 1 enter the through holes 204 of the four damper assemblies 2 through the four branch flow paths, respectively, and the oil in the through holes 204 enters the lower chamber 2012 to cause the piston rod 203 to move upward to raise the vehicle body.

As shown in fig. 7, when it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 may switch to the height maintaining mode, the fifth control valve 7 and the sixth control valve 8 are both opened, the first control valve 3 to the fourth control valve 6 are closed, the first height maintaining branch and the second height maintaining branch are conducted, and the through hole 204 of the front left shock absorber assembly 2 and the through hole 204 of the front right shock absorber assembly 2 are communicated; the through hole 204 of the left rear absorber assembly 2 communicates with the through hole 204 of the right rear absorber assembly 2. That is, the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are in a linked state, and the piston rod 203 of the left rear shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 are in a linked state, so that the vehicle body can maintain the current height as much as possible.

As shown in fig. 8, when the vehicle enters the height lowering mode, the center charge regulator valve 32 is closed, the first to fourth control valves 3 to 6 are opened, the fifth control valve 7 is closed, and the sixth control valve 8 is closed.

The oil discharged from the lower chamber 2012 of each damper assembly 2 flows back into the reservoir 1 through the bypass and return valve 27, thereby causing each piston rod 203 to move downward to reduce the vehicle height.

As shown in fig. 9, the center charge control valve 32 is closed, the first height control valve 6 is closed, the second height control valve 7 is closed, and the first to fourth control valves 3 to 6 are closed.

When the vehicle has a roll tendency, for example, the piston rods 203 of the front left damper assembly 2 and the rear left damper assembly 2 are compressed, the piston rods 203 of the front right damper assembly 2 and the rear right damper assembly 2 are stretched, at this time, the oil in the lower chamber 2012 of the front left damper assembly 2 is discharged to the first chamber 243 through the through hole 204, the oil in the lower chamber 2012 of the rear left damper assembly 2 is discharged to the third chamber 245 through the through hole 204, and since the first chamber 243 and the third chamber 245 are located on both sides of the intermediate contact portion 2411, the directions of the forces of the oil in the first chamber 243 against the intermediate contact portion 2411 are opposite to the directions of the forces of the third chamber 245 against the intermediate contact portion 2411, and the opposite forces cancel each other out so that the moving member 241 does not move, whereby the movement of the piston rods 203 of the front left damper assembly 2 and the piston rods 203 of the rear left damper assembly 2 can be restrained.

As shown in fig. 10, the first regulator valve 20 is opened and the second regulator valve 21 is opened, the central charge regulator valve 32 is closed, the first height regulator valve 6 is closed, the second height regulator valve 7 is closed, the first to fourth control valves 3 to 6 are closed, the first on-off valve 22 is opened and the second on-off valve 23 is opened.

When the vehicle has a tendency to pitch, i.e., one of the front and rear sides of the hydraulic suspension system 1000 is compressed, for example, the piston rod 203 of the front left shock absorber assembly 2 and the piston rod 203 of the front right shock absorber assembly 2 are compressed, the oil in the lower chamber 2012 of the front left shock absorber assembly 2 flows into the upper chamber 2011 of the rear left shock absorber assembly 2 through the second pipe, and the oil in the lower chamber 2012 of the front right shock absorber assembly 2 flows into the upper chamber 2011 of the rear right shock absorber assembly 2, so that the rear left shock absorber assembly 2 and the rear right shock absorber assembly are compressed, thereby achieving front-rear consistency to avoid the vehicle continuing to pitch.

It will be appreciated that when the hydraulic suspension system 1000 according to the embodiment of the present invention is applied in an off-road vehicle, in order to increase the off-road RTI index, as shown in fig. 11, the first regulator valve 20 is closed and the second regulator valve 21 is closed, the central accumulator regulator valve 32 is closed, the first to fourth control valves 3 to 6 are closed, the first on-off valve 22 is closed and the second on-off valve 23 is closed. The first height adjustment valve 6 is opened and the second height adjustment valve 7 is opened.

With the anti-roll principle and the height maintaining principle as described above, the hydraulic suspension system 1000 can provide an anti-roll force and a vehicle body height maintaining force when the off-road vehicle passes over a rough mountain road, and thus a roll phenomenon is less likely to occur.

It should be noted that the above 4 embodiments are only exemplary, and the modes of the hydraulic suspension system 1000 are not described in each embodiment, and the above 4 embodiments all have a lifting mode, a height lowering mode, a damping adjustment, etc., which are not described in each embodiment.

A vehicle according to an embodiment of the present invention includes a hydraulic suspension system 1000 according to any of the above embodiments of the present invention.

Other components of a vehicle, such as a brake system, and the like, and operation of the vehicle according to embodiments of the invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydraulic suspension system, comprising:

The shock absorber comprises a first cylinder body, a piston and a piston rod, wherein the piston is positioned in the first cylinder body to be matched with the first cylinder body to define an upper cavity and a lower cavity, and the piston rod is arranged on the piston and the upper end of the piston rod is suitable for being connected with a vehicle body;

The upper chamber of the left front shock absorber assembly is communicated with the lower chamber of the left rear shock absorber assembly through a first pipeline, and the lower chamber of the left front shock absorber assembly is communicated with the upper chamber of the left rear shock absorber assembly through a second pipeline;

The upper chamber of the right front shock absorber assembly is communicated with the lower chamber of the right rear shock absorber assembly through a third pipeline, and the lower chamber of the right front shock absorber assembly is communicated with the upper chamber of the right rear shock absorber assembly through a fourth pipeline;

The first pipeline is communicated with the third pipeline through a first connecting pipeline to form a first loop, and the second pipeline is communicated with the fourth pipeline through a second connecting pipeline to form a second loop.

2. The hydraulic suspension system of claim 1, further comprising a first adjustment accumulator and a second adjustment accumulator, the first adjustment accumulator connected to the first circuit, an oil inlet and outlet of the first adjustment accumulator provided with a first adjustment valve; the second adjusting energy accumulator is connected to the second loop, and an oil inlet and an oil outlet of the second adjusting energy accumulator are provided with second adjusting valves.

3. The hydraulic suspension system according to claim 1, wherein the first connection line is provided with a first on-off valve for turning on or off the first connection line, and the second connection line is provided with a second on-off valve for turning on or off the second connection line.

4. The hydraulic suspension system of claim 1, further comprising: the central control cylinder comprises a second cylinder body and a moving member, the moving member is movably arranged in the second cylinder body and is matched with the second cylinder body to define a first chamber, a second chamber, a third chamber and a fourth chamber, the first chamber, the second chamber, the third chamber and the fourth chamber are sequentially arranged in the moving direction of the moving member, the first chamber and the second chamber are distributed on one side of a middle contact part of the moving member, the third chamber and the fourth chamber are distributed on the other side of the middle contact part, and the middle contact part is in moving fit with the inner wall of the second cylinder body;

The lower chamber of the left front shock absorber assembly is connected to one of the first chamber and the second chamber, and the lower chamber of the right rear shock absorber assembly is connected to the other of the first chamber and the second chamber;

the lower chamber of the left rear shock absorber assembly is connected to one of the third chamber and the fourth chamber, and the lower chamber of the right front shock absorber assembly is connected to the other of the third chamber and the fourth chamber.

5. The hydraulic suspension system according to claim 4 wherein in an initial state, the central control cylinder is symmetrically disposed about the intermediate contact.

6. The hydraulic suspension system of claim 4 wherein a through bore is formed in the piston rod, the through bore extending through the piston rod to communicate the lower chamber with the central control cylinder.

7. The hydraulic suspension system of claim 4 further comprising a fluid supply circuit having a first branch, a second branch, a third branch, and a fourth branch, the first branch, the second branch, the third branch, and the fourth branch being in communication with the first chamber, the fourth chamber, the third chamber, and the second chamber, respectively, the fluid being circulated between the lower chamber of the shock absorber and the fluid supply circuit via the central control cylinder.

8. The hydraulic suspension system of claim 7, wherein the first branch is provided with a first control valve, the second branch is provided with a second control valve, the third branch is provided with a third control valve, and the fourth branch is provided with a fourth control valve.

9. The hydraulic suspension system of claim 7, wherein a fifth control valve is disposed between the first and second branches, and a sixth control valve is disposed between the third and fourth branches.

10. The hydraulic suspension system of claim 7, wherein a damping adjustment branch is provided between the central control cylinder and the lower chamber, the damping adjustment branch being provided with an opening adjustment valve, the hydraulic suspension system further comprising a damping adjustment accumulator in communication with the damping adjustment branch.

11. The hydraulic suspension system of claim 1, wherein each set of damper assemblies includes a damper spring having opposite ends adapted to be coupled to a vehicle body and an axle.

12. The hydraulic suspension system of claim 11 wherein said damper spring housing of said left front damper assembly is secured to said damper and said damper spring housing of said right front damper assembly is secured to said damper, said damper spring of said left rear damper assembly being juxtaposed to said damper, said damper spring of said right rear damper assembly being juxtaposed to said damper.

13. A vehicle comprising a hydraulic suspension system according to any one of claims 1-12.