Hydraulic suspension device, hydraulic suspension system with same and vehicle

Abstract

A hydraulic suspension device is used for adjusting the height of a vehicle body of a vehicle and comprises a liquid storage device, the liquid storage device comprises a liquid storage device, a control pump, an oil return valve and a pressure release valve arranged at the liquid outlet end of the control pump, and the pressure release valve is used for releasing pressure at the liquid outlet end of the control pump; the shock absorber is provided with a shock absorber shell, a piston and a piston rod, the shock absorber shell is suitable for being connected with an axle, the piston is located in the shock absorber shell and matched with the shock absorber shell to define an upper cavity and a lower cavity, one end of the piston rod is connected with the piston, and the piston rod is suitable for being connected with a vehicle body. An oil channel is arranged in the piston rod, and the oil channel is communicated with the lower cavity and the liquid storage device through a connecting channel; when liquid outlet is needed, the control pump is opened, the oil return valve is in a closed state, the control pump pumps oil to the oil channel, when liquid return is needed, the control pump is closed, the oil return valve is opened, and oil flowing out of the oil channel can flow to the liquid storage device through the oil return valve.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a hydraulic suspension device, a hydraulic suspension system having the same, and a vehicle. Background Art

[0002] A suspension is a device for transmitting the mutual acting forces between the vehicle body and the axle, and is one of the four major components of an automobile, and is a key component affecting the driving performance of the automobile. The suspension can transmit the acting forces and torques feedback from the road surface, attenuate the vibrations of the wheels, mitigate impacts, improve the driving experience of the driver, and enable the vehicle to obtain ideal motion characteristics and stable driving ability. Most of the suspensions in the related art are composed of springs, guiding mechanisms, shock absorbers, etc. The damping coefficient of the shock absorber and the spring stiffness are both fixed, and it is difficult to balance comfort and handling stability. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a hydraulic suspension device for adjusting the height of the vehicle body, and the hydraulic suspension device includes:

[0004] A liquid storage device, which includes a liquid reservoir, a control pump, a return oil valve, and a pressure relief valve provided at the liquid outlet end of the control pump, and the pressure relief valve is used for relieving pressure at the liquid outlet end of the control pump;

[0005] A shock absorber, which has a shock absorber housing, a piston, and a piston rod. The shock absorber housing is adapted to be connected to the axle. The piston is located in the shock absorber housing and cooperates with the shock absorber housing to define an upper chamber and a lower chamber. One end of the piston rod is connected to the piston, and the piston rod is adapted to be connected to the vehicle body. An oil passage is provided in the piston rod, and the oil passage communicates the lower chamber with the liquid storage device through a connection passage;

[0006] When liquid needs to be discharged, the control pump is turned on and the return oil valve is in the closed state, and the control pump pumps the oil to the oil passage. When liquid needs to be returned, the control pump is turned off and the return oil valve is opened, and the oil flowing out of the oil passage can flow to the liquid reservoir through the return oil valve.

[0007] During the driving process of the vehicle, the axle will vibrate such as swaying relative to the vehicle body. When the hydraulic suspension device according to the embodiment of the present invention is installed on the vehicle, the shock absorber housing is installed on the axle, and the piston rod is connected to the vehicle body. The top end of the piston rod is relatively stationary with respect to the vehicle body, and the shock absorber housing can move relative to the piston rod along with the axle. When the oil flows between the liquid storage device and the lower chamber of the shock absorber, the piston of the shock absorber moves relative to the shock absorber housing, thereby achieving the purpose of adjusting the vehicle body.

[0008] When it is detected that the pressure in the hydraulic suspension device is relatively high for the control pump, for example, when the pressure at the outlet of the control pump reaches a certain threshold, the oil return valve opens to relieve the pressure to protect the pressure of the control pump within the normal pressure range. When, in some sudden working conditions, the pressure of other components in the hydraulic suspension device is relatively high, such as in some special working conditions, the pressure in the shock absorber is relatively high, the pressure relief valve can be opened at this time to relieve the pressure, thereby ensuring that the pressure of the entire hydraulic suspension device is within the safe range. By further providing a pressure relief valve in the hydraulic suspension device in this application, the reliable operation of the entire hydraulic suspension device is ensured, which plays an important role in improving the reliability and service life of the entire hydraulic suspension device.

[0009] In some embodiments of the present application, the hydraulic suspension device further includes an accumulator module, the accumulator module is communicated with the connection channel, and the accumulator module is adapted to adjust at least one of the damping and stiffness of the shock absorber and the height of the vehicle body.

[0010] In some embodiments of the present application, the hydraulic suspension device further includes a first control valve, the first control valve is arranged on the connection channel, and the first control valve is used to connect or block the liquid storage device and the accumulator module.

[0011] In some embodiments of the present application, the accumulator module includes a first accumulator and an opening degree regulating valve, the first accumulator is communicated with the connection channel at a first connection point, the opening degree regulating valve is arranged between the first connection point and the oil passage, and the opening degree regulating valve is used to adjust the opening degree of the connection channel between the oil passage and the first connection point to adjust the damping of the shock absorber, and the opening degree regulating valve is further used to close the connection channel between the oil passage and the first connection point to adjust the stiffness of the shock absorber assembly.

[0012] In some embodiments of the present application, the accumulator module further includes a second accumulator and a stiffness regulating valve, a second connection point communicated with the second accumulator is arranged on the connection channel, the stiffness regulating valve is arranged between the second accumulator and the second connection point, and the stiffness regulating valve is used to connect or cut off the connection channel and the second accumulator to adjust the stiffness of the shock absorber assembly.

[0013] In some embodiments of the present application, a second control valve is arranged between the first connection point and the second connection point.

[0014] In some embodiments of the present application, the hydraulic suspension device further includes a central accumulator, which is configured such that when the first control valve is closed, the hydraulic fluid in the reservoir can enter the central accumulator for energy storage; when the first control valve is open, the hydraulic fluid in the central accumulator can flow into the hydraulic fluid passage of the shock absorber assembly.

[0015] In some embodiments of the present application, the hydraulic suspension device further includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The upper chamber of the left front shock absorber assembly is communicated with the lower chamber of the right front shock absorber assembly through the first pipeline, the lower chamber of the left front shock absorber assembly is communicated with the upper chamber of the right front shock absorber assembly through the second pipeline, the upper chamber of the left rear shock absorber assembly is communicated with the lower chamber of the right rear shock absorber assembly through the third pipeline, and the lower chamber of the left rear shock absorber assembly is communicated with the upper chamber of the right rear shock absorber assembly through the fourth pipeline.

[0016] In some embodiments of the present application, the first pipeline and the third pipeline are communicated to form a first loop, the second pipeline and the fourth pipeline form a second loop. The hydraulic suspension device further includes a first regulating accumulator and a second regulating accumulator. The first regulating accumulator is connected to the first loop, and a first regulating valve is provided at the hydraulic fluid inlet and outlet of the first regulating accumulator; the second regulating accumulator is connected to the second loop, and a second regulating valve is provided at the hydraulic fluid inlet and outlet of the second regulating accumulator.

[0017] In some embodiments of the present application, 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 fifth pipeline, 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 sixth 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 seventh 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 an eighth pipeline.

[0018] In some embodiments of the present application, the fifth pipeline is communicated with the seventh pipeline through a first connecting pipeline to form a third loop, and the sixth pipeline is communicated with the eighth pipeline through a second connecting pipeline to form a fourth loop.

[0019] In some embodiments of the present application, a first on-off valve for conducting or cutting off the first connecting pipeline is provided on the first connecting pipeline, and a second on-off valve for conducting or cutting off the second connecting pipeline is provided on the second connecting pipeline.

[0020] In some embodiments of the present application, the hydraulic suspension device further includes a third regulating accumulator and a fourth regulating accumulator. The third regulating accumulator is connected to the third circuit, and a third regulating valve is provided at the oil inlet and outlet of the third regulating accumulator. The fourth regulating accumulator is connected to the fourth circuit, and a fourth regulating valve is provided at the oil inlet and outlet of the fourth regulating accumulator.

[0021] In some embodiments of the present application, the hydraulic suspension device includes a central control cylinder. The central control cylinder includes a second cylinder body and a moving member. The moving member is movably disposed in the second cylinder body and cooperates with the second cylinder body to define a first chamber, a second chamber, a third chamber, and a fourth chamber. The oil passage of the left front shock absorber assembly is connected to one of the first chamber and the second chamber, and the oil passage of the right rear shock absorber assembly is connected to the other of the first chamber and the second chamber. The oil passage of the left rear shock absorber assembly is connected to one of the third chamber and the fourth chamber, and the oil passage of the right front shock absorber assembly is connected to the other of the third chamber and the fourth chamber.

[0022] In some embodiments of the present application, the hydraulic suspension device further includes a first height-holding branch and a second height-holding branch. The first height-holding branch is respectively connected to the oil passages of the left front shock absorber assembly and the right front shock absorber assembly, and a first height control valve for conducting or blocking it is provided on the first height-holding branch. The second height-holding branch is respectively connected to the oil passages of the left rear shock absorber assembly and the right rear shock absorber assembly, and a second height control valve for conducting or blocking it is provided on the second height-holding branch.

[0023] The present application also proposes a hydraulic suspension system. The hydraulic suspension system includes a controller and the aforementioned hydraulic suspension device. The controller is configured to control the flow direction of the oil between the liquid storage device and the shock absorber according to the vehicle condition to raise or lower the height of the vehicle body.

[0024] The present application also proposes a vehicle. The vehicle includes the aforementioned hydraulic suspension system.

[0025] According to an embodiment of the present invention, a hydraulic suspension device is used to adjust the height of the vehicle body. The hydraulic suspension device includes: a liquid storage device, which is suitable for being arranged on the vehicle body and for storing oil; and a shock absorber, which has a shock absorber housing, a piston and a piston rod. The shock absorber housing is suitable for being connected to the vehicle axle. The piston is located in the shock absorber housing and cooperates with the shock absorber housing to define an upper chamber and a lower chamber. One end of the piston rod is connected to the piston, and the piston rod is suitable for being connected to the vehicle body. An oil channel is provided in the piston rod, and the oil channel connects the lower chamber with the liquid storage device so that the oil can flow between the liquid storage device and the lower chamber.

[0026] The hydraulic suspension device according to an embodiment of the present invention can stabilize the oil circuit connection, avoid wear and tear at the connection due to vibration, and minimize leakage at the connection. The use of a hollow piston rod not only reduces weight but also utilizes the oil channel defined by the hollow piston rod to allow the flow of oil in or out to adjust the position of the piston rod. This adjustment method is simple, highly reliable, low-cost, and fast in response. Furthermore, since the vehicle body height can be adjusted, the vehicle's operational stability can be improved without compromising vehicle comfort, effectively resolving the conflict between vehicle comfort and handling stability.

[0027] In some embodiments of the present invention, the liquid storage device includes a control pump and a liquid reservoir, and the control pump is disposed between the liquid reservoir and the oil channel.

[0028] In some embodiments of the present invention, the upper end of the piston rod extends out of the shock absorber housing, and an oil port is formed at the upper end of the piston rod, and the oil port is used to connect the oil channel with the liquid storage device.

[0029] In some embodiments of the present invention, the hydraulic suspension device further includes an oil outlet channel and an oil return channel, the oil outlet channel and the oil return channel are both connected between the fluid reservoir and the oil channel, and the oil outlet channel and the oil return channel partially overlap, and the control pump is arranged on the oil outlet channel.

[0030] In some embodiments of the present invention, the oil outlet channel includes a common channel and an oil outlet branch, the oil return channel includes the common channel and an oil return branch, one end of the common channel is connected to the oil channel, and the oil outlet branch and the oil return branch are both connected to the other end of the common channel.

[0031] In some embodiments of the present invention, a one-way valve and the control pump are provided on the oil outlet branch, one end of the one-way valve is connected to the common channel, the other end of the one-way valve is connected to the control pump, and an oil return valve is provided on the oil return branch.

[0032] In some embodiments of the present invention, the hydraulic suspension device further includes an accumulator module. The oil passage is communicated with the liquid storage device through a connecting passage. The accumulator module is communicated with the connecting passage. The accumulator module is adapted to adjust at least one of the damping and stiffness of the shock absorber and the height of the vehicle body.

[0033] In some embodiments of the present invention, the hydraulic suspension system further includes a first control valve. The first control valve is disposed on the connecting passage and is used to control the communication or blockage between the liquid storage device and the accumulator module.

[0034] In some embodiments of the present invention, the accumulator module includes a first accumulator and an opening degree regulating valve. The first accumulator is communicated with the connecting passage at a first connection point. The opening degree regulating valve is disposed between the first connection point and the oil passage. The opening degree regulating valve is used to adjust the opening degree of the connecting passage between the oil passage and the first connection point to adjust the damping of the shock absorber. The opening degree regulating valve is further used to close the connecting passage between the oil passage and the first connection point to adjust the stiffness of the shock absorber.

[0035] In some embodiments of the present invention, the accumulator module further includes a second accumulator and a stiffness regulating valve. A second connection point communicated with the second accumulator is disposed on the connecting passage. The stiffness regulating valve is disposed between the second accumulator and the second connection point. The stiffness regulating valve is used to communicate or cut off the connecting passage and the second accumulator to adjust the stiffness of the shock absorber.

[0036] In some embodiments of the present invention, a second control valve is further disposed between the second connection point and the oil passage.

[0037] In some embodiments of the present invention, the accumulator module further includes a first accumulator and a second accumulator. The first accumulator is communicated with the connecting passage at a first connection point. A second connection point communicated with the second accumulator is disposed on the connecting passage.

[0038] Further, the first connection point is located between the oil passage and the second connection point.

[0039] Further, a second control valve is disposed between the first connection point and the second connection point.

[0040] The hydraulic suspension system according to an embodiment of the present invention includes a controller and the hydraulic suspension device according to any one of the above embodiments of the present invention. The controller is configured to control the flow direction of the hydraulic fluid between the liquid storage device and the shock absorber according to the vehicle condition, so as to raise or lower the height of the vehicle body.

[0041] The hydraulic suspension system according to an embodiment of the present invention can adjust the height of the vehicle body. Without compromising the vehicle comfort, it can improve the operation stability of the vehicle, effectively solving the contradiction between vehicle comfort and handling stability. At the same time, the use of a hollow piston rod can not only reduce the weight, but also utilize the hydraulic fluid passage defined by the hollow piston rod to realize the discharge or intake of the hydraulic fluid to adjust the position of the piston rod. The adjustment method is simple, with high reliability, low cost and fast response speed. Also, since the piston rod is provided with a hydraulic fluid passage communicating with the lower chamber and the hydraulic fluid passage is connected to the liquid storage device, the connection of the oil circuit can be made stable, avoiding wear and other conditions at the connection due to vibration, and minimizing the occurrence of liquid leakage at the connection.

[0042] The vehicle according to an embodiment of the present invention includes the hydraulic suspension system according to the above embodiment of the present invention.

[0043] The vehicle according to an embodiment of the present invention can adjust the height of the vehicle body. Without compromising the vehicle comfort, it can improve the operation stability of the vehicle, effectively solving the contradiction between vehicle comfort and handling stability. At the same time, the use of a hollow piston rod can not only reduce the weight, but also utilize the hydraulic fluid passage defined by the hollow piston rod to realize the discharge or intake of the hydraulic fluid to adjust the position of the piston rod. The adjustment method is simple, with high reliability, low cost and fast response speed. Also, since the piston rod is provided with a hydraulic fluid passage communicating with the lower chamber and the hydraulic fluid passage is connected to the liquid storage device, the connection of the oil circuit can be made stable, avoiding wear and other conditions at the connection due to vibration, and minimizing the occurrence of liquid leakage at the connection.

[0044] The additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0046] Figure 1 is a schematic diagram of a hydraulic suspension system according to some embodiments of the present invention;

[0047] Figure 2 is a schematic diagram of a hydraulic suspension system according to other embodiments of the present invention;

[0048] Figure 3 Schematic diagram of a hydraulic suspension system according to some embodiments of the present invention, wherein the hydraulic suspension system has a roll resistance function;

[0049] Figure 4 For Figure 3 Schematic diagram of the hydraulic suspension system shown in the pressurized mode;

[0050] Figure 5 For Figure 3 Schematic diagram of the hydraulic suspension system shown in the lift mode;

[0051] Figure 6 For Figure 3 Schematic diagram of the hydraulic suspension system shown in the height reduction mode;

[0052] Figure 7 For Figure 3 Schematic diagram of the hydraulic suspension system shown in the braking anti-dive and accelerating anti-lift modes;

[0053] Figure 8 For Figure 3 Schematic diagram of the hydraulic suspension system shown in the roll resistance working condition;

[0054] Figure 9 Schematic diagram of a hydraulic suspension system according to some embodiments of the present invention, wherein the hydraulic suspension system has an anti-pitch mode;

[0055] Figure 10 Schematic diagram of a hydraulic suspension system according to some other embodiments of the present invention, wherein the hydraulic suspension system has an anti-pitch mode;

[0056] Figure 11 Schematic diagram of a hydraulic suspension system according to still some other embodiments of the present invention;

[0057] Figure 12 Schematic diagram of a hydraulic suspension system according to yet some other embodiments of the present invention;

[0058] Figure 13 For Figure 12 Schematic diagram of the hydraulic suspension system shown in the pressurized mode;

[0059] Figure 14 For Figure 12 Schematic diagram of the hydraulic suspension system shown in the lift mode;

[0060] Figure 15 For Figure 12 Schematic diagram of the hydraulic suspension system shown in the height holding mode;

[0061] Figure 16 For Figure 12Schematic diagram of the hydraulic suspension system in the high / low lowering mode;

[0062] Figure 17 is Figure 12 Schematic diagram of the hydraulic suspension system in the roll resistance mode;

[0063] Figure 18 is Figure 12 Schematic diagram of the hydraulic suspension system in the pitch resistance mode;

[0064] Figure 19 is Figure 12 Schematic diagram of the hydraulic suspension system in the roll resistance mode and the height holding mode;

[0065] Figure 20 and Figure 21 are schematic diagrams of the hydraulic suspension system according to different embodiments of the present invention;

[0066] Figure 22 is a schematic diagram of the left front shock absorber assembly and the right front shock absorber assembly according to an embodiment of the present invention;

[0067] Figure 23 is Figure 22 A cross-sectional view of the shock absorber assembly shown;

[0068] Figure 24 is a sectional view of the central control cylinder according to an embodiment of the present invention;

[0069] Figure 25 is a perspective view of the central control cylinder according to an embodiment of the present invention;

[0070] Figure 26 is a schematic diagram of the metal bellows accumulator according to an embodiment of the present invention;

[0071] Figure 27 is Figure 1 Another schematic diagram of the hydraulic suspension system shown.

[0072] Reference numerals:

[0073] Hydraulic suspension system 1000,

[0074] Reservoir 1, shock absorber assembly 2, shock absorber 200, shock absorber housing 201, upper chamber 2011, lower chamber 2012, piston 202, piston rod 203, oil passage 204, shock spring 205, first control valve 3,

[0075] The first height control valve 6, the second height control valve 7, the opening control valve 8, the first accumulator 9, the second accumulator 10, the metal bellows 101, the stiffness control valve 11, the second control valve 12, the central accumulator 13, the central accumulator control valve 32, the first regulating accumulator 14, the second regulating accumulator 15, the third regulating accumulator 16, the fourth regulating accumulator 17, the first control valve 18, the second control valve 19, the third control valve 20, the fourth control valve 21, the first on-off valve 22, the second on-off valve 23, the central control cylinder 24, the second cylinder block 240, the moving part 241, the moving body part 2410, the intermediate contact part 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 guiding assembly 249, the first guiding member 2490, the second guiding member 2491, the control pump 26, the control valve body 260, the driving motor 261, the oil return valve 27, the one-way valve 28, the pressure stabilizing accumulator 29, the pressure reducing accumulator 30, the pressure relief valve 31, the common passage 33, the oil outlet branch 34, the oil return branch 35, the pressure relief active module 31a, the pressure relief passive module. Detailed implementation manners

[0076] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as a limitation of the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0078] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] Reference is made below Figures 1 - 26 to describe a hydraulic suspension device according to an embodiment of the present invention, where the hydraulic suspension device is used on a vehicle, and the hydraulic suspension device is used to connect an axle and a body of the vehicle to adjust the height of the body of the vehicle.

[0080] As Figures 1 - 23 shown, the hydraulic suspension device according to an embodiment of the present invention includes: a liquid storage device and a shock absorber 200. The liquid storage device is adapted to be provided on the body and used to store oil. The shock absorber 200 has a shock absorber housing 201, a piston 202, and a piston rod 203. The shock absorber housing 201 is adapted to be connected to the axle. The piston 202 is located inside the shock absorber housing 201 and cooperates with the shock absorber housing 201 to define an upper chamber 2011 and a lower chamber 2012. One end of the piston rod 203 is connected to the piston 202, and the piston rod 203 is adapted to be connected to the body. An oil passage 204 is provided inside the piston rod 203, and the oil passage 204 communicates the lower chamber 2012 with the liquid storage device so that the oil can flow between the liquid storage device and the lower chamber 2012.

[0081] It can be understood that during the driving of the vehicle, the axle will vibrate such as swaying relative to the body. When the hydraulic suspension device according to the embodiment of the present invention is installed on the vehicle, the shock absorber housing 201 is installed on the axle, and the piston rod 203 is connected to the body. Thus, it can be seen that the top of the piston rod 203 is relatively stationary with respect to the body, and the shock absorber housing 201 can move relative to the piston rod 203 along with the axle. Since the oil passage 204 of the piston rod 203 is connected to the liquid storage device through an oil passage, the influence of the vibration of the axle on the oil passage connection can be reduced, the connection of the oil passage can be made stable, the wear at the connection between the oil passage and the liquid storage device can be reduced, and the wear at the connection between the oil passage and the piston rod 203 can be reduced.

[0082] It can also be understood that the oil in the liquid storage device can enter the lower chamber 2012 through the oil passage 204. When the piston rod 203 moves downward to reduce the volume of the lower chamber 2012, the oil in the lower chamber 2012 can also be discharged to the liquid storage device through the oil passage 204.

[0083] Specifically, the hydraulic suspension device has a lifting mode and a height reduction mode. In the lifting mode, the hydraulic oil in the liquid storage device can enter the oil passage 204, and the hydraulic oil entering the oil passage 204 flows into the lower chamber 2012, so that the hydraulic pressure in the lower chamber 2012 increases and the piston 202 moves upward. The upward movement of the piston 202 drives the piston rod 203 to move upward, achieving the purpose of lifting the vehicle body.

[0084] In the height reduction mode, the hydraulic oil in the liquid storage device no longer enters the oil passage, and the hydraulic oil in the shock absorber 200 can flow out of the oil passage 204 under the action of the vehicle gravity. The reduction of the hydraulic pressure in the lower chamber 2012 of the shock absorber 200 causes the piston 202 to move downward. The downward movement of the piston 202 drives the piston rod 203 to move downward to drive the vehicle body to move downward, achieving the purpose of reducing the vehicle body height.

[0085] During the driving process of the vehicle, various road conditions will be encountered. Once the suspension system of the vehicle with related technologies is selected, it cannot be adjusted during the driving process of the vehicle, so that the traditional suspension can only ensure the optimal matching of performance under a specific road and speed condition, and can only passively bear the acting force of the ground on the vehicle body, and cannot change the suspension parameters according to different roads and vehicle speeds, let alone actively control the acting force of the ground on the vehicle body.

[0086] According to the hydraulic suspension device of the embodiment of the present invention, the height of the vehicle body can be adjusted according to road conditions, etc. For example, when passing through relatively rough mountain roads, the lifting mode can be entered to increase the center of mass of the vehicle and improve the driving stability of the vehicle. When it is necessary to reduce the influence of the vehicle body on the driving speed, the height reduction mode can be entered to lower the center of mass of the vehicle. Of course, it can be understood that the above is only an exemplary description, and the height of the vehicle body can also be adjusted according to the actual needs during the driving process.

[0087] According to the hydraulic suspension device of the embodiment of the present invention, by providing the piston rod 203 with an oil passage 204 communicating with the lower chamber 2012, and the oil passage 204 is connected to the liquid storage device, the connection of the oil circuit can be made stable, avoiding wear and other situations at the connection due to vibration, and leakage of liquid at the connection can be avoided as much as possible. At the same time, the use of the hollow piston rod 203 can not only reduce the weight, but also utilize the oil passage 204 defined by the hollow piston rod 203 to realize the discharge or intake of the hydraulic oil to adjust the position of the piston rod 203. The adjustment method is simple, with high reliability, low cost and fast response speed. Also, since the height of the vehicle body can be adjusted, the operation stability of the vehicle can be improved without sacrificing the comfort of the vehicle, effectively solving the contradiction between the comfort and the handling stability of the vehicle.

[0088] As Figures 1 - 23As shown, in some embodiments of the present invention, the upper end of the piston rod 203 extends out of the shock absorber housing 201, and an oil port is formed at the upper end of the piston rod 203. The oil port is used to connect the oil passage 204 with the liquid storage device. Thus, by providing an oil port at the upper end of the piston rod 203, it is convenient to connect the oil circuit to the oil port, improving the installation efficiency.

[0089] In some embodiments of the present invention, as Figures 1 - 21 shown, the liquid storage device includes a control pump 26 and a liquid reservoir 1. The control pump 26 is arranged between the liquid reservoir 1 and the oil passage 204. Specifically, the liquid reservoir 1 stores oil, and the control pump 26 can pump the oil in the liquid reservoir 1 to the oil passage 204. Thus, by providing the control pump 26, the installation position of the liquid reservoir 1 is not limited, and the position of the liquid reservoir 1 can be reasonably arranged according to the space of the vehicle.

[0090] Furthermore, the hydraulic suspension device further includes an oil outlet passage and an oil return passage. Both the oil outlet passage and the oil return passage are connected between the liquid reservoir 1 and the oil passage 204, and there is a partial overlap between the oil outlet passage and the oil return passage. The control pump 26 is arranged on the oil outlet passage. That is to say, the oil in the liquid reservoir 1 is discharged to the oil passage 204 through the oil outlet passage, and the oil in the oil passage 204 is discharged to the liquid reservoir 1 through the oil return passage. Thus, by providing the oil outlet passage and the oil return passage, independent oil outlet and oil return can be realized, ensuring the reliable operation of liquid discharge and liquid return. Also, since there is a partial overlap between the oil outlet passage and the oil return passage, the number of connecting pipelines can be saved, making the hydraulic suspension device more compact.

[0091] In some specific examples of the present invention, as Figures 1 - 21 shown, the oil outlet passage includes a common passage 33 and an oil outlet branch 34, and the oil return passage includes a common passage 33 and an oil return branch 35. One end of the common passage 33 is connected to the oil passage 204, and both the oil outlet branch 34 and the oil return branch 35 are connected to the other end of the common passage 33. That is to say, the overlapping part of the oil outlet passage and the oil return passage is the common passage 33. The oil outlet branch 34 is connected to the liquid outlet of the liquid reservoir 1, the oil return branch 35 is connected to the liquid inlet of the liquid reservoir 1, and the control pump 26 is arranged on the oil outlet branch 34. Thus, the oil in the liquid reservoir 1 can be discharged to the oil passage 204 through the oil outlet branch 34 and the common passage 33. The oil in the oil passage 204 can be discharged back to the liquid reservoir 1 through the common passage 33 and the oil return branch 35. Thereby, the reliability of liquid return and liquid discharge is ensured.

[0092] Furthermore, as Figures 1 - 21As shown in the figure, a check valve 28 and a control pump 26 are provided on the oil outlet branch 34. One end of the check valve 28 communicates with the common channel 33, and the other end of the check valve 28 communicates with the control pump 26. A return oil valve 27 is provided on the return oil branch 35. Specifically, the liquid storage device 1 has an independent liquid return channel and a liquid outlet channel. When liquid outlet is required, the control pump 26 is opened and the return oil valve 27 is in a closed state, and the control pump 26 guides the oil to the oil channel 204 of the shock absorber 200. When liquid return is required, the control pump 26 is closed and the return oil valve 27 is opened, and the oil flowing out of the oil channel 204 of the shock absorber 200 can flow to the liquid storage device 1 through the return oil valve 27. When returning liquid, due to the existence of the check valve 28, the oil can be effectively prevented from flowing to the control pump 26, and it is avoided that the oil flows to the liquid outlet through the control pump 26 when an accident occurs to the control pump 26. Thereby ensuring the reliable progress of liquid outlet and liquid return.

[0093] In some examples of the present invention, as Figures 1 - 21 shown, the control pump 26 includes a control valve body 260 and a driving motor 261. The driving motor 261 is electrically connected to the valve in the control valve body 260, and the driving motor 261 rotates to control the rotation of the valve to realize the opening or closing of the control pump 26. Thereby, by adopting the cooperation mode of the driving motor 261 and the valve to realize the opening or closing of the control pump 26, the reliable operation of the control pump 26 can be ensured, and the influence of the oil on the opening or closing of the control pump 26 can be reduced.

[0094] According to some embodiments of the present invention, as Figures 1 - 12 shown, the hydraulic suspension device further includes a pressure relief valve 31. The pressure relief valve 31 is located at the outlet port of the control pump 26. When the liquid outlet pressure of the control pump 26 reaches a certain threshold, the pressure relief valve 31 opens for pressure relief, so as to protect the hydraulic suspension device within a normal pressure range. It should be noted that the working principle of the pressure relief valve 31 is already in the prior art and will not be described in detail herein.

[0095] In some embodiments of the present invention, as Figures 1 - 21 shown, the hydraulic suspension device further includes a pressure stabilizing accumulator 29. The pressure stabilizing accumulator 29 is arranged at the outlet end of the control pump 26, so that the pressure stabilizing accumulator 29 can stabilize the pressure and eliminate the flow fluctuation at the outlet end of the control pump 26.

[0096] In some examples of the present invention, the pressure stabilizing accumulator 29 can adopt a metal bellows accumulator, as Figure 26As shown in the figure, the metal bellows accumulator is composed of a cylinder assembly and a bellows assembly. The cylinder assembly includes an upper cover, a sealing ring, a cylinder barrel, a snap ring, and a sealing ring; the bellows assembly includes a sealing cover, a guide ring, a bellows, and a lower cover. The metal bellows accumulator can replace the airbag or diaphragm, and uses the metal bellows 101 as a flexible separation element between the fluid and the gas. The bellows can be used in a very wide temperature range. The metal bellows is welded to other components, so it is completely airtight. It can move up and down inside the accumulator without any friction or wear, and can operate for a long time with only one adjustment.

[0097] In some embodiments of the present invention, the hydraulic suspension device further includes an accumulator module. The oil passage 204 communicates with the liquid storage device through a connecting passage, and the accumulator module communicates with the connecting passage. The accumulator module is adapted to adjust at least one of the damping and stiffness of the shock absorber 200 and the height of the vehicle body. It should be explained that the accumulator module plays a role in energy storage, that is, the oil can flow into the accumulator module for energy storage. When the hydraulic suspension device needs it, the oil in the accumulator module is discharged for replenishment.

[0098] Specifically, when the accumulator module can be used to adjust the height of the vehicle body, at this time, the oil in the accumulator module can be discharged to the oil passage 204 to enter the lower chamber 2012, or the oil in the lower chamber 2012 can be discharged to the accumulator module for energy storage. When the accumulator module is used to adjust the damping of the shock absorber 200, the flow passage of the connecting passage becomes narrower or wider to adjust the damping (that is, the flow resistance of the oil flowing into and out of the shock absorber 200 becomes larger or smaller). When the accumulator module is used to adjust the stiffness of the shock absorber 200, the connecting passage and the accumulator module are selected to be connected, or the connection between the accumulator module and the connecting passage is selected to be disconnected. Thus, the adjustment function of the hydraulic suspension device can be increased, making the vehicle equipped with the hydraulic suspension device run more smoothly.

[0099] As Figures 1 - 21 shown, in some embodiments of the present invention, the hydraulic suspension system further includes a first control valve 3. The first control valve 3 is arranged on the connecting passage and is used to control the connection or disconnection between the liquid storage device and the accumulator module. That is to say, when the first control valve 3 cuts off the connecting passage, the flow passage between the liquid storage device and the accumulator module is disconnected, and the oil in the liquid storage device will not flow into the accumulator module. Thus, by setting the first control valve 3, it can be determined whether the accumulator module needs to be energized. When energization is required, the first control valve 3 is opened. After the energy storage is completed, the first control valve 3 is closed, and the accumulator module is used to adjust at least one of the damping and stiffness of the shock absorber 200 and the height of the vehicle body.

[0100] As Figures 1 - 21As shown, in some embodiments of the present invention, the accumulator module includes a first accumulator 9 and an opening regulating valve 8. The first accumulator 9 is communicated with the connection channel at the first connection point. The opening regulating valve 8 is arranged between the first connection point and the oil passage 204. The opening regulating valve 8 is used to regulate the opening of the connection channel between the oil passage 204 and the first connection point, so as to regulate the damping of the shock absorber 200. The opening regulating valve 8 is also used to close the connection channel between the oil passage 204 and the first connection point, so as to regulate the stiffness of the shock absorber 200.

[0101] Specifically, the first accumulator 9 can store energy. When the opening regulating valve 8 is in the open state, when the opening of the opening regulating valve 8 decreases, the amount of oil that can flow through the connection channel decreases, the flow channel of the shock absorber 200 flowing to the connection channel becomes narrower, and the damping increases. When the opening of the opening regulating valve 8 increases, the flow channel of the shock absorber 200 flowing to the connection channel becomes wider, and the damping decreases. Therefore, through the cooperation of the first accumulator 9 and the opening regulating valve 8, the reliability of the damping adjustment of the hydraulic suspension device is ensured, and the amount of oil flowing through the connection channel is matched with the required damping. In other words, the oil flow rate in the corresponding connection channel can be adjusted by the opening regulating valve 8, so the damping of the corresponding connection channel can be adjusted, and the purpose of adjusting the damping of the hydraulic suspension device can be achieved. Thus, the damping of the hydraulic suspension system 1000 can be adjusted according to the actual situation, for example, it can be adjusted according to the road conditions, etc., to ensure that the damping of the hydraulic suspension system 1000 can meet the shock absorption requirements, and effectively solve the contradiction between vehicle comfort and handling stability.

[0102] When the opening regulating valve 8 is in the closed state, the connection between the shock absorber 200 and the first accumulator 9 is disconnected, the oil in the shock absorber 200 cannot be discharged to the first accumulator 9, and the oil in the first accumulator 9 cannot be discharged into the shock absorber 200 either. Therefore, the stiffness of the shock absorber 200 can be increased. At this time, the opening regulating valve 8 is a cut-off regulating valve, which can not only achieve the regulation of the opening, but also achieve the cut-off and connection.

[0103] In some examples of the present invention, the opening regulating valve 8 includes a first motor and a first valve body. The first motor can control the movement of the valve in the first valve body to change the flow area of the first valve body, so as to achieve the purpose of adjusting the flow rate.

[0104] According to some embodiments of the present invention, the accumulator module further includes a second accumulator 10 and a stiffness regulating valve 11. A second connection point communicating with the second accumulator 10 is provided on the connection passage. The stiffness regulating valve 11 is disposed between the second accumulator 10 and the second connection point. The stiffness regulating valve 11 is configured to connect or disconnect the connection passage and the second accumulator 10 to adjust the stiffness of the shock absorber 200. Specifically, when the stiffness regulating valve 11 is opened, the hydraulic fluid can flow between the second accumulator 10 and the shock absorber 200. When the stiffness regulating valve 11 is closed, the second accumulator 10 and the shock absorber 200 are disconnected, whereby the hydraulic fluid in the shock absorber 200 cannot be discharged into the second accumulator 10, and the hydraulic fluid in the second accumulator 10 cannot be discharged into the shock absorber 200 either, thereby increasing the stiffness of the shock absorber 200.

[0105] Further, as Figures 1 - 9 shown, a second control valve 12 is further provided between the second connection point and the hydraulic fluid passage 204. Thus, when the second control valve 12 is closed and the stiffness regulating valve 11 is opened, the hydraulic fluid in the reservoir 1 can enter the second accumulator 10 for energy storage. Therefore, by providing the second control valve 12, the second accumulator 10 can be charged with energy.

[0106] As Figures 1 - 21 shown, the accumulator module further includes a first accumulator 9 and a second accumulator 10. The first accumulator 9 communicates with the connection passage at the first connection point. A second connection point communicating with the second accumulator 10 is provided on the connection passage. Specifically, by providing the first accumulator 9 and the second accumulator 10, the stiffness of the connection passage can be adjusted by using the first accumulator 9 and the second accumulator 10. Further, the first connection point is located between the hydraulic fluid passage 204 and the second connection point.

[0107] In some specific examples of the present invention, a second control valve 12 is provided between the first connection point and the second connection point. Thus, by opening or closing the second control valve 12, the number of accumulators communicating with the shock absorber 200 can be controlled to adjust the stiffness or damping of the shock absorber 200.

[0108] Next, reference is made to Figures 1 - 26 describe a hydraulic suspension system 1000 according to an embodiment of the present invention, wherein the hydraulic suspension system 1000 is used in a vehicle, and the hydraulic suspension system 1000 is used to connect the axle and the body of the vehicle.

[0109] The hydraulic suspension system according to an embodiment of the present invention includes a controller and a hydraulic suspension device according to any one of the above embodiments of the present invention. The controller is configured to control the flow direction of the hydraulic fluid between the liquid storage device and the shock absorber according to the vehicle condition to raise or lower the height of the vehicle body.

[0110] It should be noted that the hydraulic suspension system 1000 according to an embodiment of the present invention includes a plurality of shock absorber assemblies 2.

[0111] The plurality of shock absorber assemblies 2 are divided into a left front shock absorber assembly 2, a left rear shock absorber assembly 2, a right front shock absorber assembly 2, and a right rear shock absorber assembly 2. Each shock absorber assembly 2 includes a shock absorber 200. It should be noted that in the description of the present invention, "front" refers to the direction towards the vehicle head, and "rear" refers to the direction towards the vehicle tail. In the forward direction, the right side is the direction of the main driver's right hand, and the left side is the direction of the main driver's left hand.

[0112] The oil passage 204 of each shock absorber assembly 2 is connected to the liquid storage device through a connecting passage. The oil in the liquid storage device enters each oil passage 204 to cause the piston 202 to move upward, and the piston 202 drives the piston rod 203 and the vehicle body to move upward; in the height reduction mode, the oil in each lower chamber 2012 is discharged to the liquid storage device through the oil passage 204, so that the piston 202 moves downward, and the piston 202 drives the piston rod 203 and the vehicle body to move downward.

[0113] Specifically, the hydraulic suspension system 1000 has a lifting mode and a height reduction mode, and the controller controls the hydraulic suspension system 1000 to switch between the lifting mode and the height reduction mode according to the vehicle condition. In the lifting mode, oil can enter the oil passages 204 of the left front shock absorber assembly 2, the right front shock absorber assembly 2, the left rear shock absorber assembly 2, and the right rear shock absorber assembly 2. The hydraulic oil entering each oil passage 204 flows into the lower chamber 2012, so that the hydraulic pressure in the lower chamber 2012 increases and the piston 202 moves upward. The upward movement of the piston 202 drives the piston rod 203 to move upward. The upward movement of the piston rod 203 of the left front shock absorber assembly 2, the upward movement of the piston rod 203 of the right front shock absorber assembly 2, the upward movement of the piston rod 203 of the left rear shock absorber assembly 2, and the upward movement of the piston rod 203 of the right rear shock absorber assembly 2 drive the vehicle body to move upward, achieving the purpose of lifting the vehicle body.

[0114] In the height reduction mode, under the action of gravity, the hydraulic oil can flow out from the hydraulic oil channels 204 of the left front shock absorber assembly 2, the hydraulic oil channels 204 of the right front shock absorber assembly 2, the hydraulic oil channels 204 of the left rear shock absorber assembly 2, and the hydraulic oil channels 204 of the right rear shock absorber assembly 2 respectively. The reduction of the hydraulic pressure in the lower chamber 2012 of each shock absorber 200 causes the piston 202 to move downward, and the downward movement of the piston 202 drives the piston rod 203 to move downward. The downward movement of the piston rod 203 of the left front shock absorber assembly 2, the downward movement of the piston rod 203 of the right front shock absorber assembly 2, the downward movement of the piston rod 203 of the left rear shock absorber assembly 2, and the downward movement of the piston rod 203 of the right rear shock absorber assembly 2 drive the vehicle body to move downward, achieving the purpose of reducing the vehicle body height.

[0115] During the driving process of the vehicle, various road conditions will be encountered. Once the suspension system of the vehicle with related technologies is selected, it cannot be adjusted during the driving process of the vehicle. As a result, the traditional suspension can only ensure the optimal matching of performance under a specific road and speed condition, and can only passively withstand the forces exerted by the ground on the vehicle body, without being able to change the suspension parameters according to different roads and vehicle speeds, let alone actively control the forces exerted by the ground on the vehicle body.

[0116] The hydraulic suspension system 1000 according to the embodiment of the present invention can adjust the height of the vehicle body according to road conditions, etc. For example, when passing through a relatively rough mountain road, it can enter the lifting mode to increase the center of mass of the vehicle and improve the driving stability of the vehicle. When it is necessary to reduce the influence of the vehicle body on the driving speed, it can enter the height reduction mode to lower the center of mass of the vehicle. Of course, it can be understood that the above is only an exemplary description, and the height of the vehicle body can also be adjusted according to the actual needs during the driving process.

[0117] The hydraulic suspension system 1000 according to the embodiment of the present invention can adjust the height of the vehicle body. Without compromising the comfort of the vehicle, it can improve the operation stability of the vehicle, effectively solving the contradiction between the comfort and handling stability of the vehicle. At the same time, the use of a hollow piston rod 203 can not only reduce the weight, but also utilize the hydraulic oil channel 204 defined by the hollow piston rod 203 to realize the discharge or intake of the hydraulic oil to adjust the position of the piston rod 203. The adjustment method is simple, with high reliability, low cost, and fast response speed. Also, since the piston rod 203 is provided with a hydraulic oil channel 204 communicating with the lower chamber 2012, and the hydraulic oil channel 204 is connected to the liquid storage device, the connection of the oil circuit can be made stable, avoiding wear and other situations at the connection due to vibration, and minimizing the occurrence of liquid leakage at the connection.

[0118] In some specific examples of the present invention, a first control valve 3 for conducting or blocking each connection channel is provided. That is to say, when the first control valve 3 corresponding to each shock absorber assembly 2 blocks the corresponding connection channel, the flow channel between the reservoir 1 and the oil passage 204 of the corresponding shock absorber assembly 2 is disconnected, and the oil in the reservoir 1 will not flow into the corresponding shock absorber 200, nor will the oil in the shock absorber 200 flow into the reservoir 1.

[0119] As Figure 10 , Figures 12 - 21 shown, in some embodiments of the present invention, the hydraulic suspension system 1000 further includes a first height-holding branch and a second height-holding branch. The first height-holding branch is respectively connected to the oil passage 204 of the left front shock absorber assembly 2 and the oil passage 204 of the right front shock absorber assembly 2, and a first height control valve 6 for conducting or blocking it is provided on the first height-holding branch.

[0120] The second height-holding branch is respectively connected to the oil passage 204 of the left rear shock absorber assembly 2 and the oil passage 204 of the right rear shock absorber assembly 2, and a second height control valve 7 for conducting or blocking it is provided on the second height-holding branch.

[0121] Specifically, when the first height control valve 6 is opened, the first height-holding branch is conducted; when the first height control valve 6 is closed, the first height-holding branch is blocked. When the second height control valve 7 is opened, the second height-holding branch is conducted; when the second height control valve 7 is closed, the second height-holding branch is blocked.

[0122] When it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 can switch to the height-holding mode. The first height control valve 6 and the second height control valve 7 are both opened, the first height-holding branch and the second height-holding branch are conducted, the oil passage 204 of the left front shock absorber assembly 2 and the oil passage 204 of the right front shock absorber assembly 2 are communicated; the oil passage 204 of the left rear shock absorber assembly 2 and the oil passage 204 of the left rear shock absorber assembly 2 are communicated. That is to say, the piston rods 203 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are in a linkage state, and the piston rods 203 of the left rear shock absorber assembly 2 and the left rear shock absorber assembly 2 are in a linkage state, so that the vehicle body can try to maintain the current height.

[0123] In some embodiments of the present invention, as Figures 1 - 12As shown, the accumulator module includes a second accumulator 10. One second accumulator 10 is provided corresponding to each group of shock absorber assemblies 2. The second accumulator 10 is connected to a connection channel. A stiffness regulating valve 11 is provided at the oil inlet and outlet of the second accumulator 10. The first control valve 3 is located between the second accumulator 10 and the reservoir 1. Specifically, when the first control valve 3 and the stiffness regulating valve 11 are opened, the oil in the reservoir 1 can enter the second accumulator 10 for energy storage. When the first control valve 3 is closed and the stiffness regulating valve 11 is opened, the oil in each second accumulator 10 can be discharged into the oil channel 204 in the corresponding shock absorber assembly 2, causing the piston rod 203 to rise. That is to say, the second accumulator 10 can also adjust the height of the vehicle body. When it is necessary to increase the stiffness, the first control valve 3 is closed and the stiffness regulating valve 11 is closed, disconnecting the second accumulator 10 from the corresponding shock absorber 200 and increasing the suspension stiffness.

[0124] It can be understood that each stiffness regulating valve 11 can be adjusted independently, so that the stiffness of the front and rear sides of the hydraulic suspension system 1000 can be inconsistent to meet different working conditions. For example, in the anti-dive condition and the anti-roll condition during vehicle turning, a greater stiffness is required at the front axle. Therefore, the stiffness regulating valves 11 corresponding to the left front shock absorber assembly 2 and the right front shock absorber assembly 2 can be closed, and the stiffness regulating valves 11 corresponding to the right rear shock absorber assembly 2 and the left rear shock absorber assembly 2 can be opened.

[0125] In some examples of the present invention, the first accumulator 9 is a metal bellows accumulator, and the second accumulator 10 is a diaphragm accumulator. The diaphragm accumulator has a faster pressure accumulation capacity and a larger pressure accumulation amount compared to the metal bellows accumulator. The diaphragm accumulator can reach a higher pressure accumulation amount in a shorter time. Therefore, the second accumulator 10 uses a diaphragm accumulator to accumulate pressure for each suspension to achieve vehicle body lifting. It should be noted that the pressure accumulation principles of the metal bellows accumulator and the diaphragm accumulator are both prior arts and will not be described in detail here.

[0126] In some embodiments of the present invention, as Figures 1 - 9 shown, a second control valve 12 for conducting or cutting off it is provided on the connection channel. The second control valve 12 is located between the second accumulator 10 and the oil channel 204. Specifically, the hydraulic suspension system 1000 can have a pressurization mode. As Figure 4 shown, in the pressurization mode, the first control valve 3 is opened, the second control valve 12 is closed, and the stiffness regulating valve 11 is opened. The oil in the reservoir 1 enters the second accumulator 10 for energy storage.

[0127] When it is necessary to switch to the lifting mode, the first control valve 3 is closed, the second control valve 12 is opened, and the stiffness regulating valve 11 is opened. The hydraulic fluid in the second accumulator 10 enters the hydraulic fluid passage 204 to cause the piston 202 to rise.

[0128] When it is necessary to switch to the height reduction mode, the first control valve 3 is opened, the second control valve 12 is opened, and the stiffness regulating valve 11 is closed. The hydraulic fluid discharged from the hydraulic fluid passage 204 of the shock absorber 200 flows back to the reservoir 1. Thus, by setting the second control valve 12, energy can be stored in the stiffness regulating valve 11 first. When lifting or stiffness adjustment is required, it can be achieved by opening or closing the stiffness regulating valve 11, with fast and reliable response speed.

[0129] Furthermore, the hydraulic suspension system 1000 can also have a braking anti-nod and an accelerating anti-lift mode. During vehicle driving, the first control valve 3 corresponding to each shock absorber assembly 2 can be controlled to be closed, the second control valve 12 is opened, and the stiffness regulating valve 11 is closed. The hydraulic fluid passage 204 of each shock absorber assembly 2 communicates with the first accumulator 9, and the first accumulator 9 can adjust the amount of hydraulic fluid in the corresponding shock absorber 200. Therefore, the shock absorber 200 corresponding to each shock absorber assembly 2 has a reaction force on the movement trend of the vehicle body at the corresponding position, so that the hydraulic suspension system 1000 has a braking anti-nod and an accelerating anti-lift mode.

[0130] As Figure 2 、 Figure 10 、 Figures 12 - 19 and Figure 21 shown, in some embodiments of the present invention, the accumulator module includes a central accumulator 13, and the first control valve 3 corresponding to each shock absorber assembly 2 is connected to the central accumulator 13. That is to say, when the first control valve 3 is closed, the hydraulic fluid in the reservoir 1 can enter the central accumulator 13 for energy storage. When the first control valve 3 is opened, the hydraulic fluid in the central accumulator 13 can flow into the hydraulic fluid passage 204 of each shock absorber assembly 2. Thus, by setting the central accumulator 13, pressurized energy storage can be carried out first to ensure that the hydraulic fluid can reliably flow to each shock absorber assembly 2 with fast response.

[0131] As Figures 3 - 8 shown, in some embodiments of the present invention, the upper chamber 2011 of the left front shock absorber assembly 2 communicates with the lower chamber 2012 of the right front shock absorber assembly 2 through the first pipeline, and the lower chamber 2012 of the left front shock absorber assembly 2 communicates with the upper chamber 2011 of the right front shock absorber assembly 2 through the second pipeline.

[0132] The upper chamber 2011 of the left rear shock absorber assembly 2 communicates with the lower chamber 2012 of the right rear shock absorber assembly 2 through the third pipeline, and the lower chamber 2012 of the left rear shock absorber assembly 2 communicates with the upper chamber 2011 of the right rear shock absorber assembly 2 through the fourth pipeline.

[0133] Specifically, when the vehicle has a tendency to roll, that is, the hydraulic suspension system 1000 is in a state where one side is compressed and the other side is stretched. For example, the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 are compressed, and the right front shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. At this time, the oil in the lower chamber 2012 of the left front shock absorber assembly 2 will enter the upper chamber 2011 of the right front shock absorber assembly 2 through the second pipeline, causing the piston rod 203 of the right front shock absorber assembly 2 to descend.

[0134] The oil in the lower chamber 2012 of the left rear shock absorber assembly 2 will enter the upper chamber 2011 of the right rear shock absorber assembly 2 through the fourth pipeline, causing the piston rod 203 of the right rear shock absorber assembly 2 to descend. Thus, by causing the piston rod 203 of the right front shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 to descend, a downward acting force can be provided to the right side of the vehicle body, so that the hydraulic suspension system 1000 can provide an anti-roll moment to prevent the vehicle from continuing to roll. Of course, it can be understood that the above description of the oil flow path is only an exemplary description to introduce the anti-roll principle. When the right side is compressed and the left side is stretched, using the above anti-roll principle, the hydraulic suspension system 1000 can provide an anti-roll force.

[0135] Further, as Figures 3 - 8 shown, the first pipeline and the third pipeline are connected to form a first loop, and the second pipeline and the fourth pipeline form a second loop. The hydraulic suspension system 1000 further includes a first regulating accumulator 14 and a second regulating accumulator 15. The first regulating accumulator 14 is connected to the first loop, and a first regulating valve 18 is provided at the oil inlet and outlet of the first regulating accumulator 14; the second regulating accumulator 15 is connected to the second loop, and a second regulating valve 19 is provided at the oil inlet and outlet of the second regulating accumulator 15.

[0136] Specifically, by forming the first loop and the second loop, the linkage adjustment of the right front shock absorber assembly 2 with the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 can be realized, and the linkage adjustment of the right rear shock absorber assembly 2 with the left front shock absorber assembly 2 and the left rear shock absorber assembly can be realized, further ensuring that an anti-roll moment can be provided to prevent the vehicle from continuing to roll. Among them, by controlling the opening and closing states of the first regulating valve 18 and the second regulating valve 19, the stiffness of the hydraulic suspension system 1000 can be adjusted. For example, when the first regulating valve 18 and the second regulating valve 19 are closed, the stiffness of the hydraulic suspension system 1000 can be increased. Specifically, the first regulating accumulator 14 and the second regulating accumulator 15 can adopt diaphragm accumulators.

[0137] As Figures 9 - 19As shown, in some embodiments of the present invention, the upper chamber 2011 of the left front shock absorber assembly 2 is communicated with the lower chamber 2012 of the left rear shock absorber assembly 2 through a fifth pipeline, and the lower chamber 2012 of the left front shock absorber assembly 2 is communicated with the upper chamber 2011 of the left rear shock absorber assembly 2 through a sixth pipeline.

[0138] The upper chamber 2011 of the right front shock absorber assembly 2 is communicated with the lower chamber 2012 of the right rear shock absorber assembly 2 through a seventh pipeline, and the lower chamber 2012 of the right front shock absorber assembly 2 is communicated with the upper chamber 2011 of the right rear shock absorber assembly 2 through an eighth pipeline.

[0139] Specifically, when the vehicle has a pitching tendency, that is, one of the front side and the rear side of the hydraulic suspension system 1000 is compressed and the other is stretched. For example, the piston rods 203 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are compressed, and the oil in the lower chamber of the left front shock absorber assembly 2 flows into the upper chamber 2011 of the left rear shock absorber assembly 2 through the sixth pipeline, causing the piston rod 203 of the left rear shock absorber assembly 2 to descend, so as to keep the front and rear consistent and achieve anti-pitching.

[0140] The oil in the lower chamber 2012 of the right front shock absorber assembly 2 flows into the upper chamber 2011 of the right rear shock absorber assembly 2 through the eighth pipeline, causing the piston rod 203 of the right rear shock absorber assembly 2 to descend. Thus, the hydraulic suspension system 1000 can provide an anti-pitching force to prevent the vehicle from continuing to pitch.

[0141] Of course, it can be understood that the above description of the oil flow path is only an exemplary description to introduce the anti-pitching principle. When the rear side is compressed and the front side is stretched, using the above anti-pitching principle, the hydraulic suspension system 1000 can provide an anti-pitching force.

[0142] Further, as Figures 9 - 19 shown, the fifth pipeline is communicated with the seventh pipeline through a first connecting pipeline to form a third loop, and the sixth pipeline is communicated with the eighth pipeline through a second connecting pipeline to form a fourth loop. The hydraulic suspension system 1000 further includes a third regulating accumulator 16 and a fourth regulating accumulator 17. The third regulating accumulator 16 is connected to the third loop, and a third regulating valve 20 is provided at the oil inlet and outlet of the third regulating accumulator 16. The fourth regulating accumulator 17 is connected to the fourth loop, and a fourth regulating valve 21 is provided at the oil inlet and outlet of the fourth regulating accumulator 17. Specifically, the third regulating accumulator 16 and the fourth regulating accumulator 17 can adopt diaphragm accumulators.

[0143] Thus, by forming the third and fourth circuits, coordinated 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 achieved, further ensuring that a pitching moment can be provided to prevent further pitching of the vehicle. The stiffness of the hydraulic suspension system 1000 can be adjusted by controlling the opening and closing states of the third and fourth regulating valves 20, 21. For example, closing the third and fourth regulating valves 20, 21 increases the stiffness of the hydraulic suspension system 1000.

[0144] In some embodiments of the present invention, Figure 9 and Figure 10 As shown, the first connecting pipeline is provided with a first on-off valve 22 for opening and closing it, and the second connecting pipeline is provided with a second on-off valve 23 for opening and closing it. In other words, when the first on-off valve 22 is closed, the fifth and seventh pipelines are disconnected, and when the second on-off valve 23 is closed, the sixth and eighth pipelines are disconnected. This allows the need for linkage of the four shock absorber assemblies 2 to be determined based on actual needs.

[0145] like Figures 11 - 21 、 Figure 24 and Figure 25 As shown, in some embodiments of the present invention, the hydraulic suspension system 1000 also includes a central control cylinder 24, wherein the central control cylinder 24 includes a second cylinder body 240 and a moving part 241, the moving part 241 is movably arranged in 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 arranged sequentially in the moving direction of the moving part 241, the first chamber 243 and the second chamber 244 are distributed on one side of the middle contact portion 2411 of the moving part 241, the third chamber 245 and the fourth chamber 246 are distributed on the other side of the middle contact portion 2411, and the middle contact portion 2411 is movably cooperated with the inner wall of the second cylinder body 240.

[0146] The oil passage 204 of the left front shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For the convenience of description below, the oil passage 204 of the left front shock absorber assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear shock absorber assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear shock absorber assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the fourth chamber 246 as an example for principle description.

[0147] Specifically, when the vehicle has a tendency to roll, for example, the piston rods 203 of the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 are compressed, and the piston rods 203 of the right front shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. At this time, the oil in the lower chamber 2012 of the left front shock absorber assembly 2 is discharged into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear shock absorber assembly 2 is discharged into the third chamber 245 through the oil passage 204. Since the first chamber 243 and the third chamber 245 are on both sides of the intermediate contact portion 2411, the direction of the force of the oil in the first chamber 243 on the intermediate contact portion 2411 is opposite to the direction of the force of the third chamber 245 on the intermediate contact portion 2411. The two opposite forces cancel each other out, so that the moving member 241 does not move, thereby suppressing the movement of the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the left rear shock absorber assembly 2, and playing a role in suppressing roll.

[0148] When the left front wheel encounters an obstacle, the left front wheel is lifted. During continuous driving, the center of gravity of the vehicle is lifted, and the right front wheel and the left rear wheel are at risk of leaving the ground, so that the vehicle is at risk of losing control. When the left front wheel of the vehicle encounters an obstacle such as a stone and the compression amplitude of the left front shock absorber assembly 2 is greater than that of the left rear shock absorber assembly 2 when the left front wheel is lifted, 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. As a result, the moving member 241 moves to the right to squeeze 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 to move the piston rod 203 upward, and the oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2 to move the piston rod 203 upward, thereby reducing the possibility of the left rear wheel and the right front wheel leaving the ground and improving the stability of the vehicle.

[0149] Of course, it can be understood that the above - mentioned several situations are only exemplary descriptions. When the vehicle encounters other working conditions such as the right front wheel being lifted, the left rear wheel being lifted, etc., the hydraulic fluid flows according to the above - mentioned linkage principle to avoid the vehicle from rolling over. Here, each working condition will not be described in detail.

[0150] In some embodiments of the present invention, as Figure 24 shown, the moving member 241 includes a moving body portion 2410. The intermediate contact portion 2411 is an annular protrusion provided on the moving body portion 2410. In the moving direction of the moving member 241, an intermediate cavity, a left cavity, and a right cavity are provided in the second cylinder body 240. The extension inlets of the left cavity and the right cavity are located on the inner wall of the intermediate cavity. The left end of the moving body portion 2410 extends into the left cavity through the extension inlet of the left cavity, and the right end of the moving body portion 2410 extends into the right cavity through the extension inlet of the right cavity.

[0151] A first chamber 243 is defined between the left end portion of the moving body portion 2410 and the left cavity. A part 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. A fourth chamber 246 is defined between the right end portion of the moving body portion 2410 and the right cavity. Thus, the structure of the central control cylinder 24 is simple.

[0152] Furthermore, as Figure 24 shown, the central control cylinder 24 further includes a first return spring 247 and a second return spring 248. The two ends of the first return spring 247 respectively abut against the second cylinder body 240 and the left end of the moving member 241. The two ends of the second return spring 248 respectively abut against the second cylinder body 240 and the right end of the moving member 241. The first return spring 247 and the second return spring 248 push the moving member 241 to reset towards the middle. Specifically, when the vehicle rolls over and causes the moving member 241 to move leftward, the first return spring 247 can push the moving member 241 rightward to make the moving member 241 reset. When the vehicle rolls over and causes the moving member 241 to move rightward, the second return spring 248 can push the moving member 241 leftward to make the moving member 241 reset, thereby ensuring the reliability of the central control cylinder 24.

[0153] In some examples of the present invention, as Figure 24As shown, the central control cylinder 24 includes a guiding assembly 249. The wire assembly includes a first guiding member 2490 and a second guiding member 2491. The first guiding member 2490 and the second guiding member 2491 are in sliding fit. The first guiding member 2490 is fixed on the second cylinder body 240, and the second guiding member 2491 is fixed on the moving member 241. The first return spring 247 is sleeved on the guiding assembly 249 on the left side and the first return spring 247 abuts against the first guiding member 2490. The second return spring 248 is sleeved on the guiding assembly 249 on the right side and the second return spring 248 abuts against the first guiding member 2490. Thus, by providing the guiding assembly 249, it is not only convenient for the assembly of the first return spring 247 and the second return spring 248, but also convenient for defining the deformation degree of the first return spring 247 and the second return spring 248, avoiding failure due to excessive deformation of the first return spring 247 and the second return spring 248.

[0154] Further, the second guiding member 2491 is a screw. One end of the second guiding member 2491 extends into the first guiding member 2490 to movably cooperate with the first guiding member 2490, so that the structure of the guiding assembly 249 is simple and reliable.

[0155] As Figure 25 shown, the ports of the central control cylinder 24 connected to the piston rods 203 of the four shock absorber assemblies 2 are located on the same side, which is convenient for pipeline connection.

[0156] As Figures 1 - 23 shown, in some embodiments of the present invention, each shock absorber assembly 2 includes a shock absorber spring 205. Both ends of the shock absorber spring 205 are adapted to be connected to the vehicle body and the axle. Thus, by providing the shock absorber spring 205, the buffering effect of each shock absorber assembly 2 can be increased, and the bumping of the vehicle body during driving can be reduced.

[0157] Further, as Figures 1 - 23 shown, the outer sleeve of the shock absorber spring 205 of the left front shock absorber assembly 2 is fixed on the shock absorber 200. The outer sleeve of the shock absorber spring 205 of the right front shock absorber assembly 2 is fixed on the shock absorber 200. The shock absorber spring 205 of the left rear shock absorber assembly 2 is arranged in parallel with the shock absorber 200. The shock absorber spring 205 of the right rear shock absorber assembly 2 and the shock absorber 200 are arranged in parallel.

[0158] Next, refer to Figures 1 - 21 to describe in detail the hydraulic suspension system 1000 according to several specific embodiments of the present invention. It can be understood that each of the above embodiments is only an exemplary description, rather than a limiting description, and each embodiment can be modified exemplarily according to the actual situation.

[0159] Embodiment 1:

[0160] As Figure 1As shown, the hydraulic suspension system 1000 according to an embodiment of the present invention includes a left front shock absorber assembly 2, a right front shock absorber assembly 2, a left rear shock absorber assembly 2, a right rear shock absorber assembly 2, an accumulator module, a reservoir 1, a control pump 26, a return valve 27, a check valve 28, a pressure stabilizing accumulator 29, a pressure relief valve 31, and an opening degree regulating valve 8. The accumulator module includes a first accumulator 9, a second accumulator 10, and a pressure reducing accumulator 30.

[0161] Both the left front shock absorber assembly 2 and the right front shock absorber assembly 2 include a shock absorber 200 and a shock absorber spring 205. The shock absorber spring 205 is fixedly sleeved on the shock absorber 200. Both the left rear shock absorber assembly 2 and the right rear shock absorber assembly 2 include a shock absorber 200 and a shock absorber spring 205. The shock absorber spring 205 and the shock absorber 200 are arranged in parallel. The two ends of the shock absorber spring 205 of the left rear shock absorber assembly 2 are respectively connected to the vehicle body and the axle. The two ends of the shock absorber spring 205 of the right rear shock absorber assembly 2 are respectively connected to the vehicle body and the axle. Each shock absorber 200 includes a shock absorber housing 201, a piston rod 203, and a piston 202. The piston rod 203 is connected to the piston 202. The piston 202 is movably arranged in the shock absorber housing 201 to define an upper chamber 2011 and a lower chamber 2012. An oil passage 204 is provided in the piston rod 203. The oil passage 204 is communicated with the lower chamber 2012. The oil passage 204 of each shock absorber assembly 2 is connected to the reservoir 1 through a connecting passage. A first control valve 3 is provided on each connecting passage.

[0162] The reservoir 1 has an outlet and an inlet. The control pump 26 is respectively connected to the outlet and the connecting passage to direct the oil in the reservoir 1 to the connecting passage. The return valve 27 is respectively connected to the inlet and the connecting passage. When the return valve 27 is opened, the oil flows from the connecting passage to the inlet. The check valve 28 is arranged at the outlet end of the control pump 26 and conducts unidirectionally. The pressure stabilizing accumulator 29 is arranged at the outlet end of the control pump 26 and is located between the check valve 28 and the control pump 26. The pressure stabilizing accumulator 29 can stabilize and eliminate the flow fluctuation at the outlet end of the control pump 26.

[0163] The hydraulic suspension system 1000 includes a common flow path and four branch flow paths. The four branch flow paths are respectively connected to the oil passages 204 of four groups of shock absorber assemblies 2. The check valve 28 and the return valve 27 are respectively connected to the common flow path. The pressure relief valve 31 is connected to the common flow path.

[0164] The first control valve 3 corresponding to each shock absorber assembly 2 is connected in series on the corresponding branch flow path. The first control valve 3 is used to control the conduction or cut-off of the branch flow path.

[0165] The second accumulator 10 corresponding to each shock absorber assembly 2 is connected to the corresponding branch flow path. A stiffness regulating valve 11 is provided at the oil inlet and outlet of the second accumulator 10. The stiffness regulating valve 11 is normally closed.

[0166] An opening degree regulating valve 8, a first accumulator 9 and a second control valve 12 are also provided on each branch flow path. The opening degree regulating valve 8 is used to adjust the flow rate of the fluid flowing through the corresponding branch flow path so as to adjust the damping of the hydraulic suspension system 1000. The first accumulator 9 can store energy. The second control valve 12 is arranged between the first accumulator 9 and the second accumulator 10.

[0167] A pressure reducing accumulator 30 is correspondingly arranged for each shock absorber assembly 2. The pressure reducing accumulator 30 corresponding to the left front shock absorber assembly 2 is directly connected to the piston rod 203 to communicate with the corresponding oil fluid passage 204. The pressure reducing accumulator 30 corresponding to the right front shock absorber assembly 2 is directly connected to the piston rod 203 to communicate with the corresponding oil fluid passage 204. The pressure reducing accumulator 30 corresponding to the left rear shock absorber assembly 2 is connected to the corresponding branch flow path, and the pressure reducing accumulator 30 corresponding to the right rear shock absorber assembly 2 is directly connected to the corresponding branch flow path.

[0168] Specifically, the hydraulic suspension system 1000 has a supercharging mode, a lifting mode and a height reduction mode. In the supercharging mode, the first control valve 3 is opened and the second control valve 12 is closed, the stiffness regulating valve 11 is opened, and the control pump 26 operates to make the oil fluid in the reservoir 1 flow through the four branch flow paths respectively into the corresponding second accumulators 10 for energy storage. After the energy storage of each second accumulator 10, the stiffness regulating valve 11 is closed.

[0169] In the lifting mode, the oil fluid in the reservoir 1 or the oil fluid in the energy storage module can enter the oil fluid passages 204 of the left front shock absorber assembly 2, the oil fluid passages 204 of the right front shock absorber assembly 2, the oil fluid passages 204 of the left rear shock absorber assembly 2 and the oil fluid passages 204 of the right rear shock absorber assembly 2. The hydraulic oil entering each oil fluid passage 204 flows into the lower chamber 2012, so that the hydraulic pressure in the lower chamber 2012 increases and the piston 202 moves upward. The upward movement of the piston 202 drives the piston rod 203 to move upward. The upward movement of the piston rod 203 of the left front shock absorber assembly 2, the upward movement of the piston rod 203 of the right front shock absorber assembly 2, the upward movement of the piston rod 203 of the left rear shock absorber assembly 2 and the upward movement of the piston rod 203 of the right rear shock absorber assembly 2 drive the vehicle body to move upward, achieving the purpose of lifting the vehicle body.

[0170] In the height reduction mode, the hydraulic fluid can flow out from the hydraulic fluid channels 204 of the left front shock absorber assembly 2, the hydraulic fluid channels 204 of the right front shock absorber assembly 2, the hydraulic fluid channels 204 of the left rear shock absorber assembly 2, and the hydraulic fluid channels 204 of the right rear shock absorber assembly 2 respectively. The reduction in the hydraulic pressure of the lower chamber 2012 of each shock absorber 200 causes the piston 202 to move downward, and the downward movement of the piston 202 drives the piston rod 203 to move downward. The downward movement of the piston rod 203 of the left front shock absorber assembly 2, the downward movement of the piston rod 203 of the right front shock absorber assembly 2, the downward movement of the piston rod 203 of the left rear shock absorber assembly 2, and the downward movement of the piston rod 203 of the right rear shock absorber assembly 2 drive the vehicle body to move downward, achieving the purpose of reducing the vehicle body height. It can be understood that in the height reduction mode, the hydraulic fluid discharged from each group of shock absorber assemblies 2 can be directly discharged to the reservoir 1, or discharged to the accumulator assembly for energy storage, or discharged to the reservoir 1 and the accumulator assembly simultaneously.

[0171] When the pressure in the hydraulic suspension system 1000 is relatively high, for example, when the pressure detected at the outlet of the control pump 26 reaches a certain threshold value (30 MPa), the oil return valve 27 opens for pressure relief to protect the hydraulic suspension system 1000 within the normal pressure range. At this time, the hydraulic fluid in each shock absorber 200 can flow through the connection channel and the oil return valve 27 into the reservoir 1.

[0172] If the pressure in the hydraulic suspension system 1000 is still relatively high after pressure relief or is relatively high during operation, the pressure relief valve 31 can be opened for pressure relief to ensure the reliable operation of the entire hydraulic suspension system 1000.

[0173] Furthermore, as Figure 27 shown, the pressure relief valve 31 has two outlets. When the pressure of the hydraulic suspension system exceeds the pressure value, the pressure relief active module 31a in the pressure relief valve 31 is actively opened under the control of an electric current, and the first outlet of the pressure relief valve 31 opens, enabling the hydraulic fluid in the hydraulic suspension system to directly flow into the reservoir 1 through the first outlet for pressure relief of the hydraulic suspension system and protecting the hydraulic suspension system 1000 within the normal pressure range.

[0174] Furthermore, as Figure 27 shown, in order to ensure the pressure relief effect, a pressure relief passive module 31b is also provided in the pressure relief valve 31. When the pressure of the hydraulic suspension system exceeds the pressure value, under the action of the pressure, the pressure relief passive module 31b in the pressure relief valve 31 is passively opened, and the second outlet of the pressure relief valve 31 opens, enabling the hydraulic fluid in the hydraulic suspension system to directly flow into the reservoir 1 through the second outlet for pressure relief of the hydraulic suspension system and protecting the hydraulic suspension system 1000 within the normal pressure range.

[0175] During the vehicle driving process, if the damping of the hydraulic suspension system 1000 is large, the vehicle body will be bumpy and the comfort will be affected. Then, the oil volume in each branch flow path can be adjusted by the opening degree regulating valve 8 to adjust the damping of the hydraulic suspension system 1000. When the opening degree of the opening degree regulating valve 8 decreases and the amount of oil that can flow through the connection channel decreases, the damping increases. When the opening degree of the opening degree regulating valve 8 increases, the damping decreases.

[0176] When the stiffness of the hydraulic suspension system 1000 is large and the comfort of the vehicle is reduced, the stiffness regulating valve 11 can be controlled to open, and the oil in the second accumulator 10 can be supplemented into each branch flow path, so as to reduce the stiffness of the hydraulic suspension system 1000 and increase the buffering effect of the hydraulic suspension system 1000 on bumps.

[0177] During the vehicle driving process, if the vehicle is subjected to bumps and shocks, etc., the oil in the lower chamber 2012 of each shock absorber assembly 2 can enter the decompression accumulator 30 through the oil passage 204 for energy storage, achieving the purpose of rapid pressure reduction. Since the vehicle front axle needs to ensure driving stability and the vehicle rear axle mainly needs to ensure comfort, the decompression accumulator 30 corresponding to the left front shock absorber assembly 2 is directly connected to the piston rod 203 to communicate with the corresponding oil passage 204, and the decompression accumulator 30 corresponding to the right front shock absorber assembly 2 is directly connected to the piston rod 203 to communicate with the corresponding oil passage 204, which can achieve rapid pressure relief. The decompression accumulator 30 of the rear axle can be arranged between the first accumulator 9 and the second accumulator 10, so that when the oil flows out of the shock absorber 200, it first passes through the damping and then relieves the pressure, which is beneficial to improving comfort.

[0178] Embodiment 2:

[0179] As Figure 2 shown, compared with Embodiment 1, the hydraulic suspension system 1000 according to this embodiment further includes a central accumulator 13 and a central accumulator regulating valve 32. The oil inlet and outlet of the central accumulator 13 is connected with the central accumulator regulating valve 32, and the central accumulator regulating valve 32 is connected to the common flow path. It should be noted that in this embodiment, the same structures and modes as those in Embodiment 1 will not be described in detail.

[0180] In the pressurization mode, the central accumulator regulating valve 32 is opened and the stiffness regulating valve 11 is opened, and the oil discharged from the reservoir 1 enters the central accumulator 13 and the second accumulator 10 for energy storage.

[0181] In the lifting mode, the central accumulator regulating valve 32 is opened and the stiffness regulating valve 11 is closed, and the oil flowing out of the central accumulator 13 is discharged into the lower chamber 2012 of each shock absorber assembly 2, so that the piston rod 203 rises to lift the vehicle body.

[0182] In the height reduction mode, the oil discharged from each shock absorber assembly 2 can be discharged to the central accumulator 13 and / or the reservoir 1.

[0183] Embodiment 3:

[0184] As Figures 3 - 8 shown, compared with Embodiment 1, the hydraulic suspension system 1000 according to the embodiment of the present invention further adds an anti-roll mode.

[0185] As Figures 3 - 8 shown, the upper chamber 2011 of the left front shock absorber assembly 2 is communicated with the lower chamber 2012 of the right front shock absorber assembly 2 through a first pipeline, and the lower chamber 2012 of the left front shock absorber assembly 2 is communicated with the upper chamber 2011 of the right front shock absorber assembly 2 through a second pipeline.

[0186] The upper chamber 2011 of the left rear shock absorber assembly 2 is communicated with the lower chamber 2012 of the right rear shock absorber assembly 2 through a third pipeline, and the lower chamber 2012 of the left rear shock absorber assembly 2 is communicated with the upper chamber 2011 of the right rear shock absorber assembly 2 through a fourth pipeline. The first pipeline and the third pipeline are communicated to form a first loop, and the second pipeline and the fourth pipeline form a second loop. The hydraulic suspension system 1000 further includes a first regulating accumulator 14 and a second regulating accumulator 15. The first regulating accumulator 14 is connected to the first loop, and a first regulating valve 18 is provided at the oil inlet and outlet of the first regulating accumulator 14; the second regulating accumulator 15 is connected to the second loop, and a second regulating valve 19 is provided at the oil inlet and outlet of the second regulating accumulator 15.

[0187] Specifically, as Figure 8 shown, when the vehicle has a tendency to roll, that is, the hydraulic suspension system 1000 is in a state of one-side compression and one-side stretching, for example, the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 are compressed, and the right front shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. At this time, the oil in the lower chambers 2012 of the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 will enter the upper chamber 2011 of the right front shock absorber assembly 2 through the second loop.

[0188] The hydraulic fluid in the lower chamber 2012 of the left rear shock absorber assembly 2 and the lower chamber 2012 of the left front shock absorber assembly 2 will enter the upper chamber 2011 of the right rear shock absorber assembly 2 through the second circuit, causing the piston rod 203 of the right front shock absorber assembly 2 to descend and the piston rod 203 of the right rear shock absorber assembly 2 to descend. Thus, a downward acting force can be provided to the right side of the vehicle body to keep the vehicle balanced left and right, so that the hydraulic suspension system 1000 can provide an anti-roll moment to prevent the vehicle from continuing to roll. Of course, it can be understood that the above description of the hydraulic fluid flow path is only an exemplary description to introduce the anti-roll principle. When the right side is compressed and the left side is stretched, the hydraulic suspension system 1000 can provide an anti-roll force using the above anti-roll principle.

[0189] As shown in Figure 4 , the first control valve 3 is opened, the second control valve 12 is closed, and the stiffness control valve 11 is opened to store energy in each second accumulator 10.

[0190] As shown in Figure 5 , in the lifting condition, the first control valve 3 is closed, the second control valve 12 is opened, and the stiffness control valve 11 is opened. The hydraulic fluid in the second accumulator 10 can enter the hydraulic fluid passage 204 of the corresponding shock absorber 200 to achieve lifting.

[0191] As shown in Figure 6 , in the height reduction condition, the first control valve 3 is opened, the second control valve 12 is opened, and the stiffness control valve 11 is closed. The piston rod 203 of each shock absorber 200 moves downward, causing the hydraulic fluid in the lower chamber 2012 to be discharged through the hydraulic fluid passage 204 to the branch flow paths. The hydraulic fluid in the four branch flow paths is aggregated into the common flow path and then discharged back to the reservoir 1 through the oil return valve 27.

[0192] As shown in Figure 7 , the first control valve 3 is closed, the second control valve 12 is opened, and the stiffness control valve 11 is closed. The hydraulic fluid in the first accumulator 9 and the pressure reducing accumulator 30 can be discharged to the hydraulic fluid passage 204, or the hydraulic fluid in the hydraulic fluid passage 204 can be discharged to the first accumulator 9 or the pressure reducing accumulator 30 for energy storage. It can be understood that during the vehicle starting process, due to the inertial force, the rear part of the vehicle tends to sink and the front part tends to lift. Since the upper chamber 2011 of the left front shock absorber assembly 2 is connected to the lower chamber 2012 of the right front shock absorber assembly 2, 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 will remain stationary, thus suppressing the tendency of the front part of the vehicle to lift and playing an anti-lift role. Similarly, during the vehicle braking process, it will also play an anti-dive role.

[0193] Embodiment 4:

[0194] As shown inFigure 9 As shown, compared with Embodiment 1, in this embodiment, the hydraulic suspension system 1000 according to the embodiment of the present invention further has an anti-pitch mode.

[0195] The upper chamber 2011 of the left front shock absorber assembly 2 communicates with the lower chamber 2012 of the left rear shock absorber assembly 2 through the fifth pipeline, and the lower chamber 2012 of the left front shock absorber assembly 2 communicates with the upper chamber 2011 of the left rear shock absorber assembly 2 through the sixth pipeline.

[0196] The upper chamber 2011 of the right front shock absorber assembly 2 communicates with the lower chamber 2012 of the right rear shock absorber assembly 2 through the seventh pipeline, and the lower chamber 2012 of the right front shock absorber assembly 2 communicates with the upper chamber 2011 of the right rear shock absorber assembly 2 through the eighth pipeline. The fifth pipeline communicates with the seventh pipeline through the first connecting pipeline to form a third loop, and the sixth pipeline communicates with the eighth pipeline through the second connecting pipeline to form a fourth loop. The hydraulic suspension system 1000 further includes a third regulating accumulator 16 and a fourth regulating accumulator 17. The third regulating accumulator 16 is connected to the third loop, and a third regulating valve 20 is provided at the oil inlet and outlet of the third regulating accumulator 16. The fourth regulating accumulator 17 is connected to the fourth loop, and a fourth regulating valve 21 is provided at the oil inlet and outlet of the fourth regulating accumulator 17. A first on-off valve 22 for conducting or blocking it is provided on the first connecting pipeline, and a second on-off valve 23 for conducting or blocking it is provided on the second connecting pipeline.

[0197] Specifically, when the vehicle has a pitching tendency, that is, one of the front side and the rear side of the hydraulic suspension system 1000 is compressed and the other is stretched. For example, the piston rods 203 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are compressed, and the oil in the lower chamber 2012 of the left front shock absorber assembly 2 flows into the upper chamber 2011 of the left rear shock absorber assembly 2 through the sixth pipeline, causing the piston rod 203 of the left rear shock absorber assembly 2 to descend.

[0198] The oil in the lower chamber 2012 of the right front shock absorber assembly 2 flows into the upper chamber 2011 of the right rear shock absorber assembly 2 through the eighth pipeline, causing the piston rod 203 of the right front shock absorber assembly 2 to descend. Thus, the hydraulic suspension system 1000 can provide an anti-pitch force to prevent the vehicle from continuing to pitch.

[0199] By forming the third loop and the fourth 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, further ensuring that an anti-pitch moment can be provided to prevent the vehicle from continuing to pitch. Among them, by controlling the opening and closing states of the third regulating valve 20 and the fourth regulating valve 21, the stiffness of the hydraulic suspension system 1000 can be adjusted. For example, when the third regulating valve 20 and the fourth regulating valve 21 are closed, the stiffness of the hydraulic suspension system 1000 can be increased.

[0200] When the first on-off valve 22 is closed, the fifth pipeline and the seventh pipeline are disconnected, and when the second on-off valve 23 is closed, the sixth pipeline and the eighth pipeline are disconnected, so that it can be determined whether the four shock absorber assemblies 2 need to be linked according to actual needs.

[0201] It is understandable that the above description of the oil flow path is merely an exemplary description to introduce the anti-pitch principle. When the rear side is compressed and the front side is stretched, the hydraulic suspension system 1000 can provide an anti-pitch force using the above anti-pitch principle.

[0202] Example 5:

[0203] like Figure 10 As shown, compared with Example 4, the hydraulic suspension system 1000 according to the embodiment of the present invention is not provided with a second accumulator 10. The hydraulic suspension system 1000 according to the embodiment of the present invention also includes a central accumulator 13, a first height maintaining branch and a second height maintaining branch. The first height maintaining branch is respectively connected to the oil channel 204 of the left front shock absorber assembly 2 and the oil channel 204 of the right front shock absorber assembly 2. The first height maintaining branch is provided with a first height control valve 6 for connecting or closing it.

[0204] The second height maintaining branch is connected to the oil channel 204 of the left rear shock absorber assembly 2 and the oil channel 204 of the right rear shock absorber assembly 2 respectively. The second height maintaining branch is provided with a second height control valve 7 for opening or closing it.

[0205] Specifically, when the first height control valve 6 is open, the first height maintaining branch is connected; when the first height control valve 6 is closed, the first height maintaining branch is blocked. When the second height control valve 7 is open, the second height maintaining branch is connected; when the second height control valve 7 is closed, the second height maintaining branch is blocked.

[0206] When the vehicle body's height needs to be maintained, the hydraulic suspension system 1000 can switch to a height-maintaining mode. Both the first and second height-maintaining control valves 6 and 7 are opened, the first and second height-maintaining branches are connected, and the oil passages 204 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are connected; the oil passages 204 of the left rear shock absorber assembly 2 and the right rear shock absorber assembly 2 are connected. In other words, the piston rods 203 of the left front shock absorber assembly 2 and the piston rods 203 of the right front shock absorber assembly 2 are in a linked state, and the piston rods 203 of the left rear shock absorber assembly 2 and the piston rods 203 of the right rear shock absorber assembly 2 are in a linked state, thereby allowing the vehicle body to maintain its current height as much as possible.

[0207] In the height-holding mode, the first control valve 3 and the second control valve 12 are controlled to remain closed.

[0208] In this embodiment, in the boosting mode, the first control valve 3 is closed, and the oil in the reservoir 1 is discharged into the central accumulator 13 for energy storage.

[0209] Embodiment 6:

[0210] As Figure 11 shown, in this embodiment, compared with Embodiment 4, the hydraulic suspension system 1000 according to the embodiment of the present invention further includes a central control cylinder 24.

[0211] The central control cylinder 24 includes a second cylinder body 240 and a moving member 241. The moving member 241 is movably disposed in 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 arranged in sequence in the moving direction of the moving member 241. The first chamber 243 and the second chamber 244 are distributed on one side of the intermediate contact portion 2411 of the moving member 241, and the third chamber 245 and the fourth chamber 246 are distributed on the other side of the intermediate contact portion 2411. The intermediate contact portion 2411 is movably engaged with the inner wall of the second cylinder body 240.

[0212] The oil passage 204 of the left front shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For the sake of description below, an example is given where the oil passage 204 of the left front shock absorber assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear shock absorber assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear shock absorber assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the fourth chamber 246 to describe the principle.

[0213] Specifically, when the vehicle has a tendency to roll, for example, the piston rods 203 of the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 are compressed, and the piston rods 203 of the right front shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. At this time, the oil in the lower chamber 2012 of the left front shock absorber assembly 2 is discharged into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear shock absorber assembly 2 is discharged into the third chamber 245 through the oil passage 204. 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 exerted by the oil in the first chamber 243 on the intermediate contact portion 2411 is opposite to the direction of the force exerted by the third chamber 245 on the intermediate contact portion 2411. The two opposite forces cancel each other out, so that the moving member 241 does not move, thereby suppressing the movement of the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the left rear shock absorber assembly 2, and playing a role in suppressing roll.

[0214] When the left front wheel of the vehicle encounters an obstacle such as a stone, and the compression amplitude of the left front shock absorber assembly 2 is greater than that of the left rear shock absorber assembly 2 when the left front wheel is lifted, 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. As a result, the moving member 241 moves to the right and squeezes 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 to move the piston rod 203 upward, and the oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2 to move the piston rod 203 upward, thereby reducing the possibility of the left rear wheel and the right front wheel leaving the ground and improving the stability of the vehicle. Of course, it can be understood that the above several situations are only exemplary descriptions. When the vehicle encounters other working conditions such as the right front wheel being lifted or the left rear wheel being lifted, the oil flows according to the above linkage principle to avoid vehicle roll, and each working condition will not be described in detail here.

[0215] It can be understood that the hydraulic suspension system 1000 of this embodiment also has the anti-pitch mode described in Embodiment 4, which will not be elaborated here.

[0216] Embodiment 7:

[0217] As Figures 12 - 19 shown, in this embodiment, compared with Embodiment 4, the hydraulic suspension system 1000 according to the embodiment of the present invention cancels the second accumulator 10, and the hydraulic suspension system 1000 according to the embodiment of the present invention is provided with a central accumulator 13, a central control cylinder 24, a first height maintaining branch and a second height maintaining branch.

[0218] The oil inlet and outlet of the central accumulator 13 are connected to a central accumulator regulating valve 32, and the central accumulator regulating valve 32 is connected to the common flow path.

[0219] The central control cylinder 24 includes a second cylinder block 240 and a moving member 241. The moving member 241 is movably disposed within the second cylinder block 240 and cooperates with the second cylinder block 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 arranged in sequence in the moving direction of the moving member 241. The first chamber 243 and the second chamber 244 are distributed on one side of the intermediate contact portion 2411 of the moving member 241, and the third chamber 245 and the fourth chamber 246 are distributed on the other side of the intermediate contact portion 2411. The intermediate contact portion 2411 is in movable cooperation with the inner wall of the second cylinder block 240.

[0220] The oil passage 204 of the left front shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246.

[0221] The first height holding branch is respectively connected to the oil passage 204 of the left front shock absorber assembly 2 and the oil passage 204 of the right front shock absorber assembly 2, and a first height control valve 6 for conducting or blocking it is provided on the first height holding branch.

[0222] The second height holding branch is respectively connected to the oil passage 204 of the left rear shock absorber assembly 2 and the oil passage 204 of the right rear shock absorber assembly 2, and a second height control valve 7 for conducting or blocking it is provided on the second height holding branch.

[0223] Specifically, for the sake of convenience in description below, taking the oil passage 204 of the left front shock absorber assembly 2 being connected to the first chamber 243, the oil passage 204 of the right rear shock absorber assembly 2 being connected to the second chamber 244, the oil passage 204 of the left rear shock absorber assembly 2 being connected to the third chamber 245, and the oil passage 204 of the right front shock absorber assembly 2 being connected to the fourth chamber 246 as an example for principle description.

[0224] Specifically, as Figure 13 shown, when the hydraulic suspension system 1000 enters the pressurization mode, the central accumulator regulating valve 32 is opened and the four first control valves 3 are closed, the first height control valve 6 is closed and the second height control valve 7 is closed, and the oil flowing out from the reservoir 1 is discharged to the central accumulator 13 for energy storage.

[0225] As Figure 14 shown, when the vehicle enters the lifting mode, the central energy storage regulating valve 32 opens, the four first control valves 3 open, the first height control valve 6 closes, and the second height control valve 7 closes.

[0226] The oil discharged from the central accumulator 13 enters the oil channels 204 of the four shock absorber assemblies 2 through four branch flow paths respectively. The oil in the oil channels 204 enters the lower chamber 2012 to move the piston rod 203 upward to raise the vehicle body.

[0227] As Figure 15 shown, when it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 can switch to the height holding mode. Both the first height control valve 6 and the second height control valve 7 open, the four first control valves 3 close, the first height holding branch and the second height holding branch are conducted, and the oil channels 204 of the left front shock absorber assembly 2 and the oil channels 204 of the right front shock absorber assembly 2 are connected; the oil channels 204 of the left rear shock absorber assembly 2 and the oil channels 204 of the right rear shock absorber assembly 2 are connected. That is to say, the piston rods 203 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are in a linkage state, and the piston rods 203 of the left rear shock absorber assembly 2 and the right rear shock absorber assembly 2 are in a linkage state, so that the vehicle body can try to maintain the current height.

[0228] As Figure 16 shown, when the vehicle enters the height reduction mode, the central energy storage regulating valve 32 closes, the four first control valves 3 open, the first height control valve 6 closes, and the second height control valve 7 closes.

[0229] The oil discharged from the lower chamber 2012 of each shock absorber assembly 2 flows back to the reservoir 1 through the connection channel and the oil return valve 27, so that each piston rod 203 moves downward to reduce the vehicle body height.

[0230] As Figure 17 shown, the central energy storage regulating valve 32 closes, the first height regulating valve 6 closes, the second height regulating valve 7 closes, and the four first control valves 3 close.

[0231] When the vehicle has a tendency to roll, for example, the piston rods 203 of the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 are compressed, and the piston rods 203 of the right front shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. At this time, the oil in the lower chamber 2012 of the left front shock absorber assembly 2 is discharged into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear shock absorber assembly 2 is discharged into the third chamber 245 through the oil passage 204. Since the first chamber 243 and the third chamber 245 are on both sides of the intermediate contact portion 2411, the direction of the force of the oil in the first chamber 243 on the intermediate contact portion 2411 is opposite to the direction of the force of the third chamber 245 on the intermediate contact portion 2411. The two opposite forces cancel each other out, so that the moving member 241 does not move, thereby suppressing the movement of the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the left rear shock absorber assembly 2, and playing a role in suppressing roll.

[0232] When the left front wheel of the vehicle encounters an obstacle such as a stone, and the left front wheel is lifted so that the compression amplitude of the left front shock absorber assembly 2 is greater than that 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. As a result, the moving member 241 moves to the right and squeezes 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 to move the piston rod 203 upward, and the oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2 to move the piston rod 203 upward, thereby reducing the possibility of the left rear wheel and the right front wheel leaving the ground and improving the stability of the vehicle.

[0233] Of course, it can be understood that the above several situations are only exemplary descriptions. When the vehicle encounters other working conditions such as the right front wheel being lifted, the left rear wheel being lifted, etc., the oil flows according to the above linkage principle to avoid the vehicle from rolling. Each working condition will not be described in detail here.

[0234] As Figure 18 shown, the third regulating valve 20 is opened and the fourth regulating valve 21 is opened, the central energy storage regulating valve 32 is closed, the first height regulating valve 6 is closed, the second height regulating valve 7 is closed, the four first control valves 3 are closed, the first on-off valve 22 is opened and the second on-off valve 23 is opened.

[0235] When the vehicle has a pitching tendency, that is, one of the front and rear sides of the hydraulic suspension system 1000 is compressed and the other is stretched. For example, the piston rods 203 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are compressed, and the piston rods 203 of the left rear shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. The oil in the lower chamber 2012 of the left front shock absorber assembly 2 flows into the upper chamber 2011 of the left rear shock absorber assembly 2 through the sixth pipeline, causing the piston rod 203 of the left rear shock absorber assembly 2 to descend.

[0236] The oil in the lower chamber 2012 of the right front shock absorber assembly 2 flows into the upper chamber 2011 of the right rear shock absorber assembly 2 through the eighth pipeline, causing the piston rod 203 of the right rear shock absorber assembly 2 to descend. Thus, the hydraulic suspension system 1000 can provide an anti-pitching force to prevent the vehicle from continuing to pitch.

[0237] By forming the third circuit and the fourth circuit, the interlocking 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, further ensuring that an anti-pitching moment can be provided to prevent the vehicle from continuing to pitch. Among them, by controlling the opening and closing states of the third regulating valve 20 and the fourth regulating valve 21, the stiffness of the hydraulic suspension system 1000 can be adjusted. For example, when the third regulating valve 20 and the fourth regulating valve 21 are closed, the stiffness of the hydraulic suspension system 1000 can be increased.

[0238] Of course, it can be understood that the above description of the oil flow path is only an exemplary description to introduce the anti-pitching principle. When the rear side is compressed and the front side is stretched, the hydraulic suspension system 1000 can provide an anti-pitching force using the above anti-pitching principle.

[0239] It can be understood that when the hydraulic suspension system 1000 according to the embodiment of the present invention is applied to an off-road vehicle, in order to improve the off-road RTI index, as Figure 19 shown, the third regulating valve 20 is closed and the fourth regulating valve 21 is closed, the central energy storage regulating valve 32 is closed, the four first control valves 3 are closed, the first on-off valve 22 is closed and the second on-off valve 23 is closed. The first height regulating valve 6 is opened and the second height regulating valve 7 is opened.

[0240] Using the anti-roll principle and the height-keeping principle described above, when the off-road vehicle passes through a rough mountain road, the hydraulic suspension system 1000 can provide an anti-roll force and a body height-keeping force, so it is not easy to roll over.

[0241] Embodiment 8:

[0242] As Figure 20As shown, in this embodiment, compared with Embodiment 1, the hydraulic suspension system 1000 according to the embodiment of the present invention further includes: a central control cylinder 24, a first height-holding branch, and a second height-holding branch.

[0243] The central control cylinder 24 includes a second cylinder body 240 and a moving member 241. The moving member 241 is movably disposed in 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 arranged in sequence in the moving direction of the moving member 241. The first chamber 243 and the second chamber 244 are distributed on one side of the intermediate contact portion 2411 of the moving member 241, and the third chamber 245 and the fourth chamber 246 are distributed on the other side of the intermediate contact portion 2411. The intermediate contact portion 2411 is movably engaged with the inner wall of the second cylinder body 240.

[0244] The oil passage 204 of the left front shock absorber assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear shock absorber assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear shock absorber assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For the convenience of description below, the oil passage 204 of the left front shock absorber assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear shock absorber assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear shock absorber assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front shock absorber assembly 2 is connected to the fourth chamber 246 as an example for principle description.

[0245] Specifically, when the vehicle has a tendency to roll, for example, the piston rods 203 of the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 are compressed, and the piston rods 203 of the right front shock absorber assembly 2 and the right rear shock absorber assembly 2 are stretched. At this time, the oil in the lower chamber 2012 of the left front shock absorber assembly 2 is discharged to the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear shock absorber assembly 2 is discharged to the third chamber 245 through the oil passage 204. 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 on the intermediate contact portion 2411 is opposite to the direction of the force of the third chamber 245 on the intermediate contact portion 2411. The two opposite forces cancel each other out, so that the moving member 241 does not move, thereby suppressing the movement of the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the left rear shock absorber assembly 2, and playing a role in suppressing roll.

[0246] When the left front wheel of the vehicle encounters an obstacle such as a rock, and the left front wheel is lifted so that the compression amplitude of the left front shock absorber assembly 2 is greater than that of the left rear shock absorber assembly 2, the amount of oil discharged into the first chamber 243 from the left front shock absorber assembly 2 is greater than the amount of oil discharged into the third chamber 245 from the left rear shock absorber assembly 2. As a result, the moving part 241 moves rightward to squeeze 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 to move the piston rod 203 upward, and the oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2 to move the piston rod 203 upward. Thereby, the possibility of the left rear wheel and the right front wheel leaving the ground is reduced, and the stability of the vehicle is improved.

[0247] Of course, it can be understood that the above several situations are only exemplary descriptions. When the vehicle encounters other working conditions such as the right front wheel being lifted, the left rear wheel being lifted, etc., the oil flows according to the above linkage principle to prevent the vehicle from rolling over. Each working condition will not be described in detail here.

[0248] The first height maintaining branch is respectively connected to the oil passage 204 of the left front shock absorber assembly 2 and the oil passage 204 of the right front shock absorber assembly 2. A first height control valve 6 for conducting or cutting off it is provided on the first height maintaining branch.

[0249] The second height maintaining branch is respectively connected to the oil passage 204 of the left rear shock absorber assembly 2 and the oil passage 204 of the right rear shock absorber assembly 2. A second height control valve 7 for conducting or cutting off it is provided on the second height maintaining branch.

[0250] Specifically, when the first height control valve 6 is opened, the first height maintaining branch is conducted; when the first height control valve 6 is closed, the first height maintaining branch is cut off. When the second height control valve 7 is opened, the second height maintaining branch is conducted; when the second height control valve 7 is closed, the second height maintaining branch is cut off.

[0251] When it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 can switch to the height maintaining mode. The first height control valve 6 and the second height control valve 7 are both opened, the first height maintaining branch and the second height maintaining branch are conducted, and the oil passage 204 of the left front shock absorber assembly 2 and the oil passage 204 of the right front shock absorber assembly 2 are communicated; the oil passage 204 of the left rear shock absorber assembly 2 and the oil passage 204 of the left rear shock absorber assembly 2 are communicated. That is to say, the piston rods 203 of the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are in a linkage state, and the piston rods 203 of the left rear shock absorber assembly 2 and the left rear shock absorber assembly 2 are in a linkage state, so that the vehicle body can try to maintain the current height.

[0252] Example 9:

[0253] As Figure 21 shown, in this embodiment, compared with Embodiment 8, the hydraulic suspension system 1000 according to the embodiment of the present invention does not provide the second control valve 12, and the hydraulic suspension system 1000 includes a central accumulator 13.

[0254] It should be noted that, in this embodiment, in the supercharging mode, the oil in the reservoir 1 flows to the central accumulator 13 and the second accumulator 10 for energy storage.

[0255] The hydraulic suspension system 1000 of this embodiment has the same modes as those in Embodiment 8, and will not be described here.

[0256] It should be noted that the above 9 embodiments are only exemplary descriptions, and the modes of the hydraulic suspension system 1000 are not exhaustively described in each embodiment. The above 9 embodiments all have a lifting mode, a height reduction mode, damping adjustment, etc., and will not be elaborated in each embodiment here.

[0257] A vehicle according to an embodiment of the present invention includes the hydraulic suspension system 1000 according to any one of the above embodiments of the present invention.

[0258] The vehicle according to the embodiment of the present invention can adjust the height of the vehicle body according to road conditions, etc. For example, when passing through a relatively rough mountain road, it can enter the lifting mode to increase the center of mass of the vehicle and improve the driving stability of the vehicle. When it is necessary to reduce the influence of the vehicle body on the driving speed, it can enter the height reduction mode to lower the center of mass of the vehicle. Of course, it can be understood that the above is only an exemplary description, and the height of the vehicle body can also be adjusted according to the actual needs during driving.

[0259] The vehicle according to the embodiment of the present invention can adjust the height of the vehicle body. Without compromising the comfort of the vehicle, it can improve the operation stability of the vehicle and effectively solve the contradiction between the comfort and handling stability of the vehicle. At the same time, the use of a hollow piston rod 203 can not only reduce the weight, but also utilize the oil passage 204 defined by the hollow piston rod 203 to realize the discharge or intake of oil to adjust the position of the piston rod 203. The adjustment method is simple, highly reliable, low in cost, and fast in response speed. Also, since the piston rod 203 is provided with an oil passage 204 communicating with the lower chamber 2012, and the oil passage 204 is connected to the liquid storage device, the connection of the oil circuit can be made stable, and wear and other conditions due to vibration at the connection can be avoided, and leakage of liquid at the connection can be minimized.

[0260] Other components of the vehicle according to the embodiments of the present invention, such as the braking system, etc., and operations are known to those of ordinary skill in the art and will not be described in detail herein.

[0261] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0262] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic suspension device for adjusting the height of the vehicle body, characterized in that, The hydraulic suspension device includes: A liquid storage device, which includes a liquid reservoir, a control pump, a return oil valve, and a pressure relief valve arranged at the liquid outlet end of the control pump. The pressure relief valve is used to relieve pressure at the liquid outlet end of the control pump; A shock absorber, which has a shock absorber housing, a piston, and a piston rod. The shock absorber housing is adapted to be connected to an axle. The piston is located inside the shock absorber housing and cooperates with the shock absorber housing to define an upper chamber and a lower chamber. One end of the piston rod is connected to the piston, and the piston rod is adapted to be connected to a vehicle body. An oil passage is arranged inside the piston rod, and the oil passage communicates with the lower chamber and the liquid storage device through a connecting passage; When liquid needs to be discharged, the control pump is turned on and the return oil valve is in a closed state. The control pump pumps oil to the oil passage. When liquid needs to be returned, the control pump is turned off and the return oil valve is opened. The oil flowing out of the oil passage can flow to the liquid reservoir through the return oil valve.

2. The hydraulic suspension device according to claim 1, characterized in that, The hydraulic suspension device further includes an accumulator module, which is communicated with the connecting passage. The accumulator module is adapted to adjust at least one of the damping and stiffness of the shock absorber and the height of the vehicle body.

3. The hydraulic suspension device according to claim 2, characterized in that, The hydraulic suspension device further includes a first control valve, which is arranged on the connecting passage. The first control valve is used to connect or block the liquid storage device and the accumulator module.

4. The hydraulic suspension device according to claim 3, characterized in that, The accumulator module includes a first accumulator and an opening degree regulating valve. The first accumulator is communicated with the connecting passage at a first connection point. The opening degree regulating valve is arranged between the first connection point and the oil passage. The opening degree regulating valve is used to regulate the opening degree of the connecting passage between the oil passage and the first connection point to adjust the damping of the shock absorber. The opening degree regulating valve is also used to close the connecting passage between the oil passage and the first connection point to adjust the stiffness of the shock absorber assembly.

5. The hydraulic suspension device according to claim 4, wherein, The accumulator module further includes a second accumulator and a stiffness regulating valve. A second connection point communicated with the second accumulator is arranged on the connecting passage. The stiffness regulating valve is arranged between the second accumulator and the second connection point. The stiffness regulating valve is used to connect or disconnect the connecting passage and the second accumulator to adjust the stiffness of the shock absorber assembly.

6. The hydraulic suspension device according to claim 5, characterized in that, A second control valve is arranged between the first connection point and the second connection point.

7. The hydraulic suspension device according to claim 6, characterized in that, The hydraulic suspension device further includes a central accumulator, which is configured such that when the first control valve is closed, the oil in the liquid reservoir can enter the central accumulator for energy storage; when the first control valve is opened, the oil in the central accumulator can flow into the oil passage of the shock absorber assembly.

8. The hydraulic suspension device according to claim 1, characterized in that, The hydraulic suspension device further includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The upper chamber of the left front shock absorber assembly communicates with the lower chamber of the right front shock absorber assembly through the first pipeline. The lower chamber of the left front shock absorber assembly communicates with the upper chamber of the right front shock absorber assembly through the second pipeline. The upper chamber of the left rear shock absorber assembly communicates with the lower chamber of the right rear shock absorber assembly through the third pipeline. The lower chamber of the left rear shock absorber assembly communicates with the upper chamber of the right rear shock absorber assembly through the fourth pipeline.

9. The hydraulic suspension device according to claim 8, characterized in that, The first pipeline and the third pipeline communicate to form a first loop. The second pipeline and the fourth pipeline form a second loop. The hydraulic suspension device further includes a first regulating accumulator and a second regulating accumulator. The first regulating accumulator is connected to the first loop, and a first regulating valve is provided at the oil inlet and outlet of the first regulating accumulator. The second regulating accumulator is connected to the second loop, and a second regulating valve is provided at the oil inlet and outlet of the second regulating accumulator.

10. The hydraulic suspension device according to claim 1, characterized in that, The upper chamber of the left front shock absorber assembly communicates with the lower chamber of the left rear shock absorber assembly through a fifth pipeline. The lower chamber of the left front shock absorber assembly communicates with the upper chamber of the left rear shock absorber assembly through a sixth pipeline. The upper chamber of the right front shock absorber assembly communicates with the lower chamber of the right rear shock absorber assembly through a seventh pipeline. The lower chamber of the right front shock absorber assembly communicates with the upper chamber of the right rear shock absorber assembly through an eighth pipeline.

11. The hydraulic suspension device according to claim 10, characterized in that, The fifth pipeline communicates with the seventh pipeline through a first connecting pipeline to form a third loop. The sixth pipeline communicates with the eighth pipeline through a second connecting pipeline to form a fourth loop.

12. The hydraulic suspension device according to claim 11, characterized in that, A first on-off valve for conducting or blocking it is provided on the first connecting pipeline. A second on-off valve for conducting or blocking it is provided on the second connecting pipeline.

13. The hydraulic suspension device according to claim 1, characterized in that, The hydraulic suspension device further includes a third regulating accumulator and a fourth regulating accumulator. The third regulating accumulator is connected to the third loop, and a third regulating valve is provided at the oil inlet and outlet of the third regulating accumulator. The fourth regulating accumulator is connected to the fourth loop, and a fourth regulating valve is provided at the oil inlet and outlet of the fourth regulating accumulator.

14. The hydraulic suspension device according to claim 1, characterized in that, The hydraulic suspension device includes a central control cylinder. The central control cylinder includes a second cylinder body and a moving member. The moving member is movably disposed in the second cylinder body and cooperates with the second cylinder body to define a first chamber, a second chamber, a third chamber, and a fourth chamber. The oil passage of the left front shock absorber assembly is connected to one of the first chamber and the second chamber. The oil passage of the right rear shock absorber assembly is connected to the other of the first chamber and the second chamber. The oil passage of the left rear shock absorber assembly is connected to one of the third chamber and the fourth chamber. The oil passage of the right front shock absorber assembly is connected to the other of the third chamber and the fourth chamber.

15. The hydraulic suspension device according to claim 1, characterized in that, The hydraulic suspension device further includes a first height maintaining branch circuit and a second height maintaining branch circuit. The first height maintaining branch circuit is respectively connected to the hydraulic fluid passages of the left front shock absorber assembly and the right front shock absorber assembly, and a first height control valve for conducting or blocking it is provided on the first height maintaining branch circuit; the second height maintaining branch circuit is respectively connected to the hydraulic fluid passages of the left rear shock absorber assembly and the right rear shock absorber assembly, and a second height control valve for conducting or blocking it is provided on the second height maintaining branch circuit.

16. A hydraulic suspension system, characterized in that, It includes a controller and the hydraulic suspension device according to any one of claims 1-15. The controller is used to control the flow direction of the hydraulic fluid between the liquid storage device and the shock absorber according to the vehicle condition, so as to raise or lower the height of the vehicle body.

17. A vehicle, characterized in that, It includes the hydraulic suspension system according to claim 16.

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