Hydraulic suspension device and hydraulic suspension system and vehicle having the same

Abstract

The application discloses a hydraulic suspension device, a hydraulic suspension system and a vehicle with the same. The hydraulic suspension device comprises a liquid storage device, which is adapted to be arranged on a vehicle body and used for storing oil; and a shock absorber, which has a shock absorber housing, a piston and a piston rod. The shock absorber housing is adapted to be connected with an 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 with the piston, and the piston rod is adapted to be connected with the vehicle body. An oil passage is arranged in the piston rod and communicates the lower chamber with the liquid storage device, so that the oil can flow between the liquid storage device and the lower chamber. According to the hydraulic suspension device, the height of the vehicle body can be adjusted, and the operation stability of the vehicle can be improved without impairing the comfort of the vehicle.

Description

TECHNICAL FIELD

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

[0002] Suspension is a device for transmitting the interaction force between the vehicle body and the axle, and is one of the four components of an automobile, and is a key component affecting the driving performance of an automobile. The suspension can transmit the force and torque of the road feedback, attenuate the vibration of the wheel, cushion the impact, improve the driving experience of the driver, and make the vehicle obtain ideal motion characteristics and stable driving ability. The suspension of the related art is mostly composed of a spring, a guide mechanism and a shock absorber, and the damping coefficient and the spring stiffness of the shock absorber are fixed, so it is difficult to balance comfort and operation stability. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a hydraulic suspension device, which can improve the operation stability of the vehicle without compromising the comfort of the vehicle.

[0004] The present application also provides a hydraulic suspension system having the above-mentioned hydraulic suspension device.

[0005] The present application also provides a vehicle having the above-mentioned hydraulic suspension system.

[0006] The hydraulic suspension device according to the embodiments of the present application is used for adjusting the height of the vehicle body, and comprises a liquid storage device adapted to be arranged on the vehicle body and used for storing oil, and a shock absorber having a shock absorber housing, a piston and a piston rod, the shock absorber housing being adapted to be connected with an axle, the piston being located in the shock absorber housing and cooperating with the shock absorber housing to define an upper chamber and a lower chamber, one end of the piston rod being connected with the piston, and the piston rod being adapted to be connected with the vehicle body, and an oil passage being arranged in the piston rod and communicating the lower chamber with the liquid storage device, so that the oil can flow between the liquid storage device and the lower chamber.

[0007] The hydraulic suspension device according to the embodiments of the present application can stabilize the connection of the oil passage, avoid wear and tear at the connection due to vibration, and avoid liquid leakage at the connection as much as possible. In addition, the hollow piston rod not only reduces the weight, but also realizes the discharge or discharge of the oil through the oil passage defined by the hollow piston rod to adjust the position of the piston rod, so that the adjustment is simple, reliable, low in cost and fast in response. In addition, the height of the vehicle body can be adjusted, so that the operation stability of the vehicle can be improved without compromising the comfort of the vehicle, and the contradiction between the comfort of the vehicle and the operation stability is effectively solved.

[0008] In some embodiments of the present application, the liquid storage device comprises a control pump and a liquid reservoir, the control pump is arranged between the liquid reservoir and the oil passage.

[0009] In some embodiments of the present application, the upper end of the piston rod extends out of the shock absorber housing, the upper end of the piston rod is formed with an oil port, the oil port is used to communicate the oil passage and the liquid storage device.

[0010] In some embodiments of the present application, the hydraulic suspension device further comprises an oil outlet passage and an oil return passage, the oil outlet passage and the oil return passage are both communicated between the liquid reservoir and the oil passage, and the oil outlet passage and the oil return passage partially overlap, the control pump is arranged on the oil outlet passage.

[0011] In some embodiments of the present application, the oil outlet passage comprises a common passage and an oil outlet branch, the oil return passage comprises the common passage and an oil return branch, one end of the common passage is communicated with the oil passage, the oil outlet branch and the oil return branch are both connected to the other end of the common passage.

[0012] In some embodiments of the present application, a one-way valve and the control pump are arranged on the oil outlet branch, one end of the one-way valve is communicated with the common passage, the other end of the one-way valve is communicated with the control pump, and an oil return valve is arranged on the oil return branch.

[0013] In some embodiments of the present application, the hydraulic suspension device further comprises an accumulator module, the oil passage is communicated with the liquid storage device through a connection passage, the accumulator module is communicated with the connection passage, and the accumulator module is adapted to adjust at least one of the damping and the stiffness of the shock absorber and the height of the vehicle body.

[0014] In some embodiments of the present application, the hydraulic suspension system further comprises a first control valve, the first control valve is arranged on the connection passage and is used to control the communication or blockage between the liquid storage device and the accumulator module.

[0015] In some embodiments of the present application, the accumulator module comprises a first accumulator and an opening degree adjusting valve, the first accumulator is communicated with the connection passage at a first connection point, the opening degree adjusting valve is arranged between the first connection point and the oil passage, the opening degree adjusting valve is used to adjust the opening degree of the connection passage between the oil passage and the first connection point to adjust the damping of the shock absorber, and the opening degree adjusting valve is also used to close the connection passage between the oil passage and the first connection point to adjust the stiffness of the shock absorber.

[0016] In some embodiments of the present application, the accumulator module further comprises a second accumulator and a stiffness adjustment valve, the connection channel is provided with a second connection point in communication with the second accumulator, and the stiffness adjustment valve is arranged between the second accumulator and the second connection point, and is used to communicate or isolate the connection channel and the second accumulator to adjust the stiffness of the shock absorber.

[0017] In some embodiments of the present application, a second control valve is further arranged between the second connection point and the oil channel.

[0018] In some embodiments of the present application, the accumulator module further comprises a first accumulator and a second accumulator, the first accumulator is in communication with the connection channel at a first connection point, and the connection channel is provided with a second connection point in communication with the second accumulator.

[0019] Further, the first connection point is located between the oil channel and the second connection point.

[0020] Further, a second control valve is arranged between the first connection point and the second connection point.

[0021] The hydraulic suspension system according to the embodiments of the present application comprises a controller and the hydraulic suspension device according to any one of the above embodiments of the present application, and the controller is used to control the flow direction of the oil between the oil storage device and the shock absorber according to the vehicle condition to raise or lower the height of the vehicle body.

[0022] The hydraulic suspension system according to the embodiments of the present application can adjust the height of the vehicle body, can improve the operation stability of the vehicle without compromising the comfort of the vehicle, and effectively solves the contradiction between the comfort and the operation stability of the vehicle. Meanwhile, the hollow piston rod not only can reduce the weight, but also can realize the discharge or discharge of the oil to adjust the position of the piston rod by using the oil channel defined by the hollow piston rod, and the adjustment mode is simple, the reliability is high, the cost is low, and the response speed is fast. In addition, since the piston rod is provided with the oil channel in communication with the lower chamber, and the oil channel is connected with the oil storage device, the connection of the oil circuit can be stable, and the wear of the connection due to vibration can be avoided, and the leakage phenomenon of the connection can be avoided as much as possible.

[0023] The vehicle according to the embodiments of the present application comprises the hydraulic suspension system according to the above embodiments of the present application.

[0024] According to embodiments of the present invention, the vehicle body height can be adjusted, improving the vehicle's handling stability without compromising comfort, effectively resolving the contradiction between vehicle comfort and handling stability. Simultaneously, the use of a hollow piston rod not only reduces weight but also utilizes the oil passage defined by the hollow piston rod to allow oil to flow in or out, adjusting the piston rod's position. This adjustment method is simple, highly reliable, low-cost, and has a fast response speed. Furthermore, because the piston rod has an oil passage communicating with the lower chamber, and this oil passage is connected to a reservoir, the oil circuit connection is stable, preventing wear at the connection points due to vibration and minimizing leakage.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of a hydraulic suspension system according to some embodiments of the present invention;

[0028] Figure 2 This is a schematic diagram of a hydraulic suspension system according to other embodiments of the present invention;

[0029] Figure 3 This is a schematic diagram of a hydraulic suspension system according to some embodiments of the present invention, wherein the hydraulic suspension system has anti-roll function;

[0030] Figure 4 for Figure 3 The diagram shown illustrates the hydraulic suspension system in boost mode.

[0031] Figure 5 for Figure 3 The diagram shown illustrates the hydraulic suspension system in lifting mode.

[0032] Figure 6 for Figure 3 The diagram shown illustrates the hydraulic suspension system in height-lowering mode.

[0033] Figure 7 for Figure 3 The diagram shown illustrates the hydraulic suspension system in braking anti-dive and acceleration anti-nose modes.

[0034] Figure 8 for Figure 3 The diagram shown illustrates the hydraulic suspension system in anti-roll operation.

[0035] Figure 9 Schematic diagram of a hydraulic suspension system according to some embodiments of the application, wherein the hydraulic suspension system has a pitch resistant mode;

[0036] Figure 10 Schematic diagram of a hydraulic suspension system according to some embodiments of the application, wherein the hydraulic suspension system has a pitch resistant mode;

[0037] Figure 11 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0038] Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0039] Figure 13 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0040] Figure 14 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0041] Figure 15 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0042] Figure 16 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0043] Figure 17 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0044] Figure 18 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0045] Figure 19 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 12 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0046] Figure 20 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 21 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0047] Figure 22 Schematic diagram of a hydraulic suspension system according to some embodiments of the application;

[0048] Figure 23 Schematic diagram of a hydraulic suspension system according to some embodiments of the application; Figure 22a sectional view of the shock absorber assembly shown;

[0049] Figure 24 a sectional view of a central control cylinder according to an embodiment of the present application;

[0050] Figure 25 a perspective view of a central control cylinder according to an embodiment of the present application;

[0051] Figure 26 a schematic view of a metal bellows accumulator according to an embodiment of the present application.

[0052] Reference Signs:

[0053] a hydraulic suspension system 1000,

[0054] a reservoir 1, a shock absorber assembly 2, a shock absorber 200, a shock absorber housing 201, an upper chamber 2011, a lower chamber 2012, a piston 202, a piston rod 203, an oil passage 204, a shock absorbing spring 205, a first control valve 3,

[0055] a first height control valve 6, a second height control valve 7, an opening degree adjusting valve 8, a first accumulator 9, a second accumulator 10, a metal bellows 101, a stiffness adjusting valve 11, a second control valve 12, a central accumulator 13, a central accumulator adjusting valve 32, a first adjusting accumulator 14, a second adjusting accumulator 15, a third adjusting accumulator 16, a fourth adjusting accumulator 17, a first adjusting valve 18, a second adjusting valve 19, a third adjusting valve 20, a fourth adjusting valve 21, a first on-off valve 22, a second on-off valve 23, a central control cylinder 24, a second cylinder body 240, a moving member 241, a moving body portion 2410, an intermediate contact portion 2411, a first chamber 243, a second chamber 244, a third chamber 245, a fourth chamber 246, a first return spring 247, a second return spring 248, a guide assembly 249, a first guide member 2490, a second guide member 2491, a control pump 26, a control valve body 260, a drive motor 261, a return oil valve 27, a check valve 28, a pressure stabilizing accumulator 29, a pressure reducing accumulator 30, a pressure relief valve 31, a common passage 33, an oil outlet branch 34, an oil return branch 35. DETAILED DESCRIPTION

[0056] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein like or similar elements are denoted by the same or similar reference signs throughout the drawings. The embodiments described below are examples of the present application, which are only used to explain the present application and should not be understood as limiting the present application.

[0057] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0058] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] Reference is made below to Figures 1-26 A hydraulic suspension device according to an embodiment of the present application is described, wherein the hydraulic suspension device is used on a vehicle, and the hydraulic suspension device is used to connect an axle of the vehicle and a vehicle body, and to adjust the height of the vehicle body.

[0060] As Figures 1-23 shown, the hydraulic suspension device according to an embodiment of the present application comprises a liquid storage device and a shock absorber 200, the liquid storage device is adapted to be arranged on the vehicle 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 with the axle, the piston 202 is located in 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 with the piston 202, and the piston rod 203 is adapted to be connected with the vehicle body, and an oil passage 204 is arranged in the piston rod 203, 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.

[0061] It can be understood that the vehicle will produce a swing and other vibrations when the vehicle is running, and when the hydraulic suspension device according to the embodiment of the application is installed to the vehicle, the shock absorber housing 201 is installed to the axle, and the piston rod 203 is connected to the vehicle body. Therefore, the top end of the piston rod 203 is relatively stationary with the vehicle body, and the shock absorber housing 201 can move with the axle relative to the piston rod 203. Since the oil passage 204 of the piston rod 203 is connected to the oil storage device through the oil passage, the influence of the vibration of the axle on the connection of the oil passage can be reduced, the connection of the oil passage can be stabilized, the wear of the connection of the oil passage and the oil storage device can be reduced, and the wear of the connection of the oil passage and the piston rod 203 can be reduced.

[0062] It can also be understood that the oil in the oil storage device can enter the lower chamber 2012 through the oil passage 204, and 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 oil storage device through the oil passage 204.

[0063] Specifically, the hydraulic suspension device has a lifting mode and a height reduction mode. In the lifting mode, the oil in the oil 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 to move the piston 202 upward, the piston rod 203 is driven to move upward by the piston 202 moving upward, and the purpose of lifting the vehicle body is achieved.

[0064] In the height reduction mode, the oil in the oil storage device no longer enters the oil passage, and the oil in the shock absorber 200 can flow out of the oil passage 204 under the action of the gravity of the vehicle, the hydraulic pressure of the lower chamber 2012 of the shock absorber 200 decreases to move the piston 202 downward, the piston rod 203 is driven to move downward by the piston 202 moving downward, and the purpose of reducing the height of the vehicle body is achieved.

[0065] During the running of the vehicle, various road conditions will be encountered, and the suspension system of the vehicle of the related art cannot be adjusted once it is selected during the running of the vehicle. The traditional suspension can only ensure that the vehicle is optimally matched under a specific road and speed condition, and can only passively bear the force of the ground on the vehicle body, and cannot change the suspension parameters according to different roads and speeds, and cannot actively control the force of the ground on the vehicle body.

[0066] The hydraulic suspension device according to the embodiments of the present application can adjust the height of the vehicle body according to the road conditions and the like, for example, when passing through a relatively rugged mountain road, the lifting mode can be entered, the center of mass of the vehicle can be improved, and the stability of the vehicle in driving can be improved. When it is necessary to reduce the influence of the vehicle body on the driving speed, the height reduction mode can be entered, so that the center of mass of the vehicle is reduced. 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.

[0067] The hydraulic suspension device according to the embodiments of the present application, by providing the piston rod 203 with an oil passage 204 in communication with the lower chamber 2012, the oil passage 204 is connected with the liquid storage device, so that the connection of the oil passage is stable, and wear and the like at the connection due to vibration can be avoided, and leakage at the connection can be avoided as much as possible. At the same time, the hollow piston rod 203 not only reduces the weight, but also realizes the discharge or discharge of the oil by the oil passage 204 defined by the hollow piston rod 203 to adjust the position of the piston rod 203, the adjustment mode is simple, the reliability is high, the cost is low, and the response speed is fast. Since the height of the vehicle body can be adjusted, the operation stability of the vehicle can be improved without compromising the comfort of the vehicle, and the contradiction between the comfort and the operation stability of the vehicle is effectively solved.

[0068] As shown in Figures 1-23 some embodiments of the present application, the upper end of the piston rod 203 extends out of the shock absorber housing 201, and the upper end of the piston rod 203 is formed with an oil port for communicating the oil passage 204 with the liquid storage device. Thus, by providing the oil port at the upper end of the piston rod 203, the connection of the oil passage with the oil port is facilitated, and the installation efficiency is improved.

[0069] In some embodiments of the present application, as shown in Figures 1-21 the liquid storage device includes a control pump 26 and a liquid reservoir 1, and 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, so that 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.

[0070] Further, the hydraulic suspension device further comprises an oil outlet channel and an oil return channel, both of which are communicated between the oil reservoir 1 and the oil channel 204, and the oil outlet channel and the oil return channel partially overlap, and the control pump 26 is arranged on the oil outlet channel. That is, the oil in the oil reservoir 1 is discharged to the oil channel 204 through the oil outlet channel, and the oil in the oil channel 204 is discharged to the oil reservoir 1 through the oil return channel, so that independent oil outlet and oil return can be realized by arranging the oil outlet channel and the oil return channel, and reliable oil outlet and oil return are ensured. In addition, since the oil outlet channel and the oil return channel partially overlap, the number of connecting pipelines can be saved, and the hydraulic suspension device is more compact.

[0071] In some specific examples of the present application, as shown in Figures 1-21 the oil outlet channel comprises a common channel 33 and an oil outlet branch 34, the oil return channel comprises the common channel 33 and an oil return branch 35, one end of the common channel 33 is communicated with the oil channel 204, and the oil outlet branch 34 and the oil return branch 35 are both connected to the other end of the common channel 33. That is, the overlapping part of the oil outlet channel and the oil return channel is the common channel 33, the oil outlet branch 34 is connected to the oil outlet of the oil reservoir 1, the oil return branch 35 is connected to the oil inlet of the oil reservoir 1, and the control pump 26 is arranged on the oil outlet branch 34. Therefore, the oil in the oil reservoir 1 can be discharged to the oil channel 204 through the oil outlet branch 34 and the common channel 33. The oil in the oil channel 204 can be discharged back to the oil reservoir 1 through the common channel 33 and the oil return branch 35. Therefore, the reliability of oil return and oil outlet is ensured.

[0072] Further, as shown in Figures 1-21 the oil outlet branch 34 is provided with a one-way valve 28 and a control pump 26, one end of the one-way valve 28 is communicated with the common channel 33, the other end of the one-way valve 28 is communicated with the control pump 26, and the oil return branch 35 is provided with an oil return valve 27. Specifically, the oil reservoir 1 has independent oil return and oil outlet channels. When oil outlet is needed, the control pump 26 is opened and the oil return valve 27 is closed, and the control pump 26 guides the oil to the oil channel 204 of the shock absorber 200. When oil return is needed, the control pump 26 is closed and the oil return valve 27 is opened, and the oil flowing out of the oil channel 204 of the shock absorber 200 can flow to the oil reservoir 1 through the oil return valve 27. When oil return is needed, the presence of the one-way valve 28 can effectively prevent the oil from flowing to the control pump 26, and prevent the oil from flowing to the oil outlet through the control pump 26 when the control pump 26 is accidentally opened. Therefore, the reliable oil outlet and oil return are ensured.

[0073] In some examples of the present application, as shown in Figures 1-21As shown, the control pump 26 comprises a control valve body 260 and a drive motor 261, the drive motor 261 is electrically connected with the valve in the control valve body 260, the drive motor 261 rotates to control the valve to rotate to realize the opening or closing of the control pump 26. Thus, by adopting the drive motor 261 and the valve in cooperation to realize the opening or closing of the control pump 26, the operation of the control pump 26 can be ensured to be more reliable, and the influence of the oil on the opening or closing of the control pump 26 is reduced.

[0074] According to some embodiments of the present application, as shown in Figures 1-12 As shown, the hydraulic suspension device further comprises a pressure relief valve 31 located at the outlet of the control pump 26, when the outlet pressure of the control pump 26 reaches a certain threshold, the pressure relief valve 31 is opened to release pressure, so as to protect the hydraulic suspension device within a normal pressure range. It needs to be explained that the working principle of the pressure relief valve 31 is already known in the art, and it will not be described in detail here.

[0075] In some embodiments of the present application, as shown in Figures 1-21 As shown, the hydraulic suspension device further comprises a pressure stabilizing accumulator 29 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.

[0076] In some examples of the present application, the pressure stabilizing accumulator 29 can adopt a metal bellows accumulator, as shown in Figure 26 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, 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 air bag or diaphragm, and uses a metal bellows 101 as a flexible separation element between fluid and gas. The bellows can be used in a very wide temperature range. The metal bellows is welded to other parts, so it is completely airtight. It can move up and down inside the accumulator without any friction or wear, and only needs to be adjusted once to operate for a long time.

[0077] In some embodiments of the present application, the hydraulic suspension device further comprises an accumulator module, the oil passage 204 is communicated with the liquid storage device through a connecting passage, the accumulator module is communicated with the connecting passage, and 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 needs to be explained that the accumulator module plays a role of energy storage, that is, the oil can flow into the accumulator module for energy storage, and the oil in the accumulator module is discharged for replenishment when the hydraulic suspension device needs it.

[0078] Specifically, when the accumulator module is used to adjust the height of the vehicle body, the oil in the accumulator module can be drained to the oil passage 204 to enter the lower chamber 2012, or the oil in the lower chamber 2012 can be drained 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 connection passage is narrowed or widened to adjust the damping (i.e., the flow resistance of the oil into and out of the shock absorber 200 is increased or decreased). When the accumulator module is used to adjust the stiffness of the shock absorber 200, the connection between the connection passage and the accumulator module is selected, or the connection between the accumulator module and the connection passage is selected to be disconnected. In this way, the adjustment function of the hydraulic suspension device can be increased, so that the vehicle provided with the hydraulic suspension device can run more smoothly.

[0079] As shown in Figures 1-21 some embodiments of the present application, the hydraulic suspension system further comprises a first control valve 3 arranged on the connection passage and used to control the connection or disconnection between the oil storage device and the accumulator module. That is, when the first control valve 3 is closed, the flow passage between the oil storage device and the accumulator module is disconnected, and the oil in the oil storage device cannot flow into the accumulator module. By arranging the first control valve 3, it can be determined whether the accumulator module needs to be energized, and when energization is needed, the first control valve 3 is opened. When the energization is completed, the first control valve 3 is closed, and at least one of the damping and stiffness of the shock absorber 200 and the height of the vehicle body is adjusted by the accumulator module.

[0080] As shown in Figures 1-21 some embodiments of the present application, the accumulator module comprises a first accumulator 9 connected to the connection passage at a first connection point, and an opening adjustment valve 8 arranged between the first connection point and the oil passage 204. The opening adjustment valve 8 is used to adjust the opening of the connection passage between the oil passage 204 and the first connection point to adjust the damping of the shock absorber 200, and is also used to close the connection passage between the oil passage 204 and the first connection point to adjust the stiffness of the shock absorber 200.

[0081] Specifically, the first accumulator 9 can store energy, when the opening degree adjusting valve 8 is in an open state, when the opening degree of the opening degree adjusting valve 8 is reduced so that the amount of oil liquid that can flow through the connecting channel is reduced, the flow passage of the damper 200 to the connecting channel is narrowed, and the damping is increased. When the opening degree of the opening degree adjusting valve 8 is increased, the flow passage of the damper 200 to the connecting channel is widened, and the damping is reduced, thus through the cooperation of the first accumulator 9 and the opening degree adjusting valve 8, the reliability of the damping adjustment of the hydraulic suspension device is ensured, and the amount of oil liquid flowing through the connecting channel is matched with the required damping. In other words, the oil liquid flow in the corresponding connecting channel can be adjusted by the opening degree adjusting valve 8, thus the damping of the corresponding connecting channel can be adjusted, the purpose of adjusting the damping of the hydraulic suspension device is achieved, so that the damping of the hydraulic suspension system 1000 can be adjusted according to the actual situation, for example, the damping of the hydraulic suspension system 1000 can be adjusted according to the road conditions, etc., to ensure that the damping of the hydraulic suspension system 1000 can meet the damping requirements, effectively solving the contradiction between the comfort and the steering stability of the vehicle.

[0082] When the opening degree adjusting valve 8 is in a closed state, the damper 200 and the first accumulator 9 are disconnected, the oil liquid in the damper 200 cannot be discharged to the first accumulator 9, and the oil liquid in the first accumulator 9 cannot be discharged into the damper 200, thus the stiffness of the damper 200 can be improved. At this time, the opening degree adjusting valve 8 is a cut-off adjusting valve, which can realize the adjustment of the opening degree and the cut-off and communication.

[0083] In some examples of the present application, the opening degree adjusting valve 8 comprises 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.

[0084] According to some embodiments of the present application, the accumulator module further comprises a second accumulator 10 and a stiffness adjusting valve 11, a second connecting point in communication with the second accumulator 10 is arranged on the connecting channel, and the stiffness adjusting valve 11 is arranged between the second accumulator 10 and the second connecting point. The stiffness adjusting valve 11 is used to communicate or cut off the connecting channel and the second accumulator 10 to adjust the stiffness of the damper 200. Specifically, when the stiffness adjusting valve 11 is opened, the oil liquid can flow between the second accumulator 10 and the damper 200. When the stiffness adjusting valve 11 is closed, the second accumulator 10 and the damper 200 are disconnected, so that the oil liquid in the damper 200 cannot be discharged into the second accumulator 10, and the oil liquid in the second accumulator 10 cannot be discharged into the damper 200, thereby the stiffness of the damper 200 can be improved.

[0085] Further, as shown in FIG. 1, the hydraulic suspension system 1000 further comprises a stiffness adjusting valve 11, the stiffness adjusting valve 11 is arranged on the connecting channel, and the stiffness adjusting valve 11 is arranged between the second accumulator 10 and the second connecting point. The stiffness adjusting valve 11 is used to communicate or cut off the connecting channel and the second accumulator 10 to adjust the stiffness of the damper 200. Specifically, when the stiffness adjusting valve 11 is opened, the oil liquid can flow between the second accumulator 10 and the damper 200. When the stiffness adjusting valve 11 is closed, the second accumulator 10 and the damper 200 are disconnected, so that the oil liquid in the damper 200 cannot be discharged into the second accumulator 10, and the oil liquid in the second accumulator 10 cannot be discharged into the damper 200, thereby the stiffness of the damper 200 can be improved. Figures 1-9As shown, a second control valve 12 is also provided between the second connection point and the oil passage 204. Therefore, when the second control valve 12 is closed and the stiffness regulating valve 11 is open, the oil in the reservoir 1 can enter the second accumulator 10 for energy storage. Thus, by providing the second control valve 12, energy can be stored in the second accumulator 10.

[0086] like Figures 1-21 As shown, the accumulator module also includes a first accumulator 9 and a second accumulator 10. The first accumulator 9 is connected to a connecting channel at a first connection point, and a second connection point connected to the second accumulator 10 is provided on the connecting channel. Specifically, by setting the first accumulator 9 and the second accumulator 10, the stiffness of the connecting channel can be adjusted using the first accumulator 9 and the second accumulator 10. Further, the first connection point is located between the oil channel 204 and the second connection point.

[0087] 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 connected to the vibration damper 200 can be controlled, thereby adjusting the stiffness or damping of the vibration damper 200.

[0088] The following is for reference. Figures 1-26 A hydraulic suspension system 1000 according to an embodiment of the present invention is described, wherein the hydraulic suspension system 1000 is used on a vehicle and is used to connect the axle and body of the vehicle.

[0089] According to an embodiment of the present invention, a hydraulic suspension system includes a controller and a hydraulic suspension device according to any of the above embodiments of the present invention. The controller is used to control the flow direction of oil between the reservoir and the shock absorber according to the vehicle condition, so as to raise or lower the height of the vehicle body.

[0090] 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.

[0091] The multiple 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 this invention, "front" refers to the direction towards the front of the vehicle, and "rear" refers to the direction towards the rear of the vehicle. In the forward direction, the right side is defined as the direction to the driver's right hand, and the left side is defined as the direction to the driver's left hand.

[0092] The oil passage 204 of each shock absorber assembly 2 is connected to the oil storage device through a connecting passage. The oil in the oil storage device enters each oil passage 204 to move the piston 202 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 oil storage device through the oil passage 204 to move the piston 202 downward, and the piston 202 drives the piston rod 203 and the vehicle body to move downward.

[0093] 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 conditions. In the lifting mode, oil can enter the oil passage 204 of the left front shock absorber assembly 2, the oil passage 204 of the right front shock absorber assembly 2, 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 the hydraulic oil entering each oil passage 204 flows into the lower chamber 2012, thereby increasing the hydraulic pressure in the lower chamber 2012 to move the piston 202 upward, and the upward movement of the piston 202 drives the upward movement of the piston rod 203. 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 upward movement of the vehicle body, achieving the purpose of lifting the vehicle body.

[0094] In the height reduction mode, under the action of gravity, oil can flow out of the oil passage 204 of the left front shock absorber assembly 2, the oil passage 204 of the right front shock absorber assembly 2, 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, respectively, and the hydraulic pressure in the lower chamber 2012 of each shock absorber 200 decreases to move the piston 202 downward, and the downward movement of the piston 202 drives the downward movement of the piston rod 203. 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 downward movement of the vehicle body, achieving the purpose of reducing the height of the vehicle body.

[0095] During driving, vehicles encounter various road conditions. Once the suspension system of the vehicle of the related art is selected, it cannot be adjusted during driving, so that the conventional suspension system can only ensure that the vehicle is optimally matched under a specific road and speed condition, and can only passively bear the force of the ground on the vehicle body, and cannot change the suspension parameters according to different roads and speeds, nor can it actively control the force of the ground on the vehicle body.

[0096] The hydraulic suspension system 1000 according to the embodiments of the present application can adjust the height of the vehicle body according to the road conditions and the like, for example, when passing through a relatively rugged mountain road, the lifting mode can be entered, the center of mass of the vehicle can be raised, and the stability of the vehicle in driving can be improved. When it is necessary to reduce the influence of the vehicle body on the driving speed, the height reduction mode can be entered, so that the center of mass of the vehicle is lowered. 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.

[0097] The hydraulic suspension system 1000 according to the embodiments of the present application can adjust the height of the vehicle body, improve the operation stability of the vehicle without compromising the comfort of the vehicle, and effectively solve the contradiction between the comfort and the operation stability of the vehicle. The hollow piston rod 203 not only reduces the weight, but also realizes the discharge or discharge of the oil liquid by the oil liquid passage 204 defined by the hollow piston rod 203 to adjust the position of the piston rod 203. The adjustment mode is simple, the reliability is high, the cost is low, and the response speed is fast. Since the piston rod 203 is provided with the oil liquid passage 204 communicated with the lower chamber 2012, and the oil liquid passage 204 is connected with the liquid storage device, the connection of the oil circuit is stable, and wear and other conditions at the connection due to vibration can be avoided. The leakage phenomenon at the connection can be avoided as much as possible.

[0098] In some specific examples of the present application, a first control valve 3 for conducting or cutting off each connection channel is provided. That is, when the first control valve 3 of each group of shock absorber assembly 2 cuts off the corresponding connection channel, the flow channel between the oil liquid passage 204 of the corresponding shock absorber assembly 2 and the liquid storage device 1 is disconnected, and the oil liquid in the liquid storage device 1 cannot flow into the corresponding shock absorber 200, and the oil liquid in the shock absorber 200 cannot flow into the liquid storage device 1.

[0099] As shown in Figure 10 , Figures 12-21 In some embodiments of the present application, the hydraulic suspension system 1000 further comprises a first height maintaining branch and a second height maintaining branch. The first height maintaining branch is connected with the oil liquid passage 204 of the left front shock absorber assembly 2 and the oil liquid passage 204 of the right front shock absorber assembly 2 respectively, and a first height control valve 6 for conducting or cutting off the first height maintaining branch is provided on the first height maintaining branch.

[0100] The second height maintaining branch is connected with the oil liquid passage 204 of the left rear shock absorber assembly 2 and the oil liquid passage 204 of the right rear shock absorber assembly 2 respectively, and a second height control valve 7 for conducting or cutting off the second height maintaining branch is provided on the second height maintaining branch.

[0101] Specifically, when the first height control valve 6 is opened, the first height maintaining branch is turned on; when the first height control valve 6 is closed, the first height maintaining branch is turned off. When the second height control valve 7 is opened, the second height maintaining branch is turned on; when the second height control valve 7 is closed, the second height maintaining branch is turned off.

[0102] When it is needed to maintain the height of the vehicle body, the hydraulic suspension system 1000 can be switched into 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 turned on, 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 right rear shock absorber assembly 2 are communicated. That is, the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are in linkage state, the piston rod 203 of the left rear shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 are in linkage state, so that the vehicle body can maintain the current height as much as possible.

[0103] In some embodiments of the present application, as shown in Figures 1-12 The accumulator module includes a second accumulator 10, one second accumulator 10 is arranged corresponding to each group of shock absorber assemblies 2, the second accumulator 10 is connected with the connecting passage, the oil inlet and outlet of the second accumulator 10 is provided with a stiffness adjusting valve 11, and 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 adjusting valve 11 are opened, the oil in the reservoir 1 can enter the second accumulator 10 to store energy, and when the first control valve 3 is closed and the stiffness adjusting valve 11 is opened, the oil in each second accumulator 10 can be discharged into the oil passage 204 in the corresponding shock absorber assembly 2, so that the piston rod 203 rises. That is, the second accumulator 10 can also realize the adjustment of the height of the vehicle body. When it is needed to increase the stiffness, the first control valve 3 is closed and the stiffness adjusting valve 11 is closed, so that the second accumulator 10 is disconnected with the corresponding shock absorber 200, and the suspension stiffness is increased.

[0104] It can be understood that each stiffness adjusting valve 11 can be independently adjusted, so that the stiffness of the front side and the rear side of the hydraulic suspension system 1000 can be inconsistent to meet different working condition requirements. For example, in the anti-nodding working condition and the turning anti-roll working condition of the vehicle, it is needed to provide greater stiffness for the front axle, so the stiffness adjusting valves 11 corresponding to the left front shock absorber assembly 2 and the right front shock absorber assembly 2 are closed, and the stiffness adjusting valves 11 corresponding to the right rear shock absorber assembly 2 and the left rear shock absorber assembly 2 are in the opened state.

[0105] In some examples of the present application, 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 ability and a larger pressure accumulation amount than the metal bellows accumulator. The diaphragm accumulator can reach a higher pressure accumulation amount in a shorter time, so the second accumulator 10 uses the diaphragm accumulator to accumulate pressure for each suspension to achieve the lifting of the vehicle body. It should be noted that the pressure accumulation principles of the metal bellows accumulator and the diaphragm accumulator are prior art and will not be described in detail here.

[0106] In some embodiments of the present application, as shown in Figures 1-9 , a second control valve 12 for conducting or cutting off the connection channel is provided between the second accumulator 10 and the oil passage 204. Specifically, the hydraulic suspension system 1000 can have a pressure increasing mode, as shown in Figure 4 , in which the first control valve 3 is open, the second control valve 12 is closed, and the stiffness adjusting valve 11 is open, and the oil in the reservoir 1 enters the second accumulator 10 to accumulate pressure.

[0107] When it is necessary to switch to the lifting mode, the first control valve 3 is closed, the second control valve 12 is open, and the stiffness adjusting valve 11 is open, and the oil in the second accumulator 10 enters the oil passage 204 to make the piston 202 rise.

[0108] When it is necessary to switch to the height lowering mode, the first control valve 3 is open, the second control valve 12 is open, and the stiffness adjusting valve 11 is closed, and the oil discharged from the oil passage 204 of the shock absorber 200 flows back to the reservoir 1. Thus, by providing the second control valve 12, the stiffness adjusting valve 11 can be accumulated first, and when lifting or stiffness adjustment is needed, it can be achieved by opening or closing the stiffness adjusting valve 11, which is fast and reliable.

[0109] Further, the hydraulic suspension system 1000 can also have a brake anti-nodding and acceleration anti-lifting mode. During vehicle driving, the corresponding first control valve 3 of each group of shock absorber assemblies 2 can be controlled to be closed, the second control valve 12 is open, and the stiffness adjusting valve 11 is closed, and the oil passage 204 of each group of shock absorber assemblies 2 is communicated with the first accumulator 9, and the first accumulator 9 can adjust the oil amount in the corresponding shock absorber 200. Therefore, the shock absorber 200 corresponding to each group of shock absorber assemblies 2 has a counteracting force to the movement trend of the vehicle body at the corresponding position, so that the hydraulic suspension system 1000 has a brake anti-nodding and acceleration anti-lifting mode.

[0110] As shown in Figure 2 , Figure 10 , Figures 12-19 and Figure 21As shown, in some embodiments of the present application, the accumulator module comprises a central accumulator 13, and each group of shock absorber assembly 2 is connected with the central accumulator 13 through the first control valve 3. That is, when the first control valve 3 is closed, the oil in the reservoir 1 can enter the central accumulator 13 for energy storage. When the first control valve 3 is opened, the oil in the central accumulator 13 can flow into the oil passage 204 of each group of shock absorber assembly 2, so that by providing the central accumulator 13, the pressure can be increased first, and the oil can flow reliably to each group of shock absorber assembly 2, and the response can be fast.

[0111] As shown, Figures 3-8 In some embodiments of the present application, 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.

[0112] 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.

[0113] Specifically, when the vehicle has a tendency to roll, that is, the hydraulic suspension system 1000 is in a state of compression on one side and stretching on the other side, 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, so that the piston rod 203 of the right front shock absorber assembly 2 is lowered.

[0114] 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, so that the piston rod 203 of the right rear shock absorber assembly 2 is lowered, thereby the piston rod 203 of the right front shock absorber assembly 2 is lowered and the piston rod 203 of the right rear shock absorber assembly 2 is lowered to provide a downward force to the right side of the vehicle body, so that the hydraulic suspension system 1000 can provide an anti-roll torque to prevent the vehicle from continuing to roll. It can be understood that the above description of the flow path of the oil is only an exemplary description to introduce the anti-roll principle, and when the right side is compressed and the left side is stretched, the hydraulic suspension system 1000 can provide an anti-roll force by using the above anti-roll principle.

[0115] Further, as shown, Figures 3-8As shown, the first pipeline and the third pipeline are communicated to form a first loop, and the second pipeline and the fourth pipeline are communicated to form a second loop. The hydraulic suspension system 1000 further comprises a first adjusting accumulator 14 and a second adjusting accumulator 15, the first adjusting accumulator 14 is connected with the first loop, and an oil inlet and outlet of the first adjusting accumulator 14 is provided with a first adjusting valve 18; the second adjusting accumulator 15 is connected with the second loop, and an oil inlet and outlet of the second adjusting accumulator 15 is provided with a second adjusting valve 19.

[0116] Specifically, by forming the first loop and the second loop, the linkage adjustment of the right front shock absorber assembly 2 and the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 can be realized, the linkage adjustment of the right rear shock absorber assembly 2 and the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 can be realized, and further, the anti-roll moment can be provided to prevent the vehicle from continuing to roll. By controlling the opening and closing states of the first adjusting valve 18 and the second adjusting valve 19, the stiffness of the hydraulic suspension system 1000 can be adjusted, for example, when the first adjusting valve 18 and the second adjusting valve 19 are closed, the stiffness of the hydraulic suspension system 1000 can be increased. Specifically, the first adjusting accumulator 14 and the second adjusting accumulator 15 can adopt a diaphragm accumulator.

[0117] As shown in the figure, Figures 9-19 In some embodiments of the present application, 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.

[0118] 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.

[0119] Specifically, when the vehicle has a pitch 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 rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are compressed, 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, so that the piston rod 203 of the left rear shock absorber assembly 2 is lowered, thereby keeping the front and rear consistent, and realizing anti-pitch.

[0120] 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, so that the piston rod 203 of the right rear shock absorber assembly 2 is lowered. Thus, the hydraulic suspension system 1000 can provide an anti-pitch force to prevent the vehicle from continuing to pitch.

[0121] It is understood that the above-mentioned oil flow path description is only an exemplary description to introduce the anti-pitching principle, and when the rear side is compressed and the front side is stretched, the hydraulic suspension system 1000 can provide an anti-pitching force by using the anti-pitching principle.

[0122] Further, as shown in Figures 9-19 , the fifth pipeline is communicated with the seventh pipeline through the first connecting pipeline to form a third loop, and the sixth pipeline is communicated with the eighth pipeline through the second connecting pipeline to form a fourth loop. The hydraulic suspension system 1000 further comprises a third adjusting accumulator 16 and a fourth adjusting accumulator 17, the third adjusting accumulator 16 is connected to the third loop, and the oil inlet and outlet of the third adjusting accumulator 16 is provided with a third adjusting valve 20. The fourth adjusting accumulator 17 is connected to the fourth loop, and the oil inlet and outlet of the fourth adjusting accumulator 17 is provided with a fourth adjusting valve 21. Specifically, the third adjusting accumulator 16 and the fourth adjusting accumulator 17 can adopt a diaphragm accumulator.

[0123] Therefore, 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, and further guarantee that the pitch moment can be provided to prevent the vehicle from continuing to pitch. By controlling the opening and closing states of the third adjusting valve 20 and the fourth adjusting valve 21, the stiffness of the hydraulic suspension system 1000 can be adjusted, for example, when the third adjusting valve 20 and the fourth adjusting valve 21 are closed, the stiffness of the hydraulic suspension system 1000 can be increased.

[0124] In some embodiments of the present application, as shown in Figure 9 and Figure 10 , a first on-off valve 22 for conducting or cutting off the first connecting pipeline is arranged on the first connecting pipeline, and a second on-off valve 23 for conducting or cutting off the second connecting pipeline is arranged on the second connecting pipeline. That is, 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 linkage of the four groups of shock absorber assemblies 2 is needed according to the actual demand.

[0125] As shown in Figures 11-21 , Figure 24 and Figure 25As shown, in some embodiments of the present application, the hydraulic suspension system 1000 further comprises a central control cylinder 24, wherein the central control cylinder 24 comprises a second cylinder body 240 and a moving part 241 movably arranged in the second cylinder body 240 and cooperating 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 arranged in sequence in the moving direction of the moving part 241, the first chamber 243 and the second chamber 244 being distributed on one side of a middle contact part 2411 of the moving part 241, the third chamber 245 and the fourth chamber 246 being distributed on the other side of the middle contact part 2411, and the middle contact part 2411 movingly cooperating with the inner wall of the second cylinder body 240.

[0126] 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 one 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 one of the third chamber 245 and the fourth chamber 246. For the purpose of description, 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, which are taken as examples for the principle description.

[0127] Specifically, when the vehicle has a roll tendency, 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 the two sides of the middle contact part 2411, the direction of the force of the oil in the first chamber 243 on the middle contact part 2411 is opposite to the direction of the force of the oil in the third chamber 245 on the middle contact part 2411, the two opposite forces cancel each other out so that the moving part 241 does not move, thereby the movement of the piston rods 203 of the left front shock absorber assembly 2 and the left rear shock absorber assembly 2 can be inhibited, and the roll can be inhibited.

[0128] When the left front wheel encounters an obstacle, the left front wheel is lifted, and during the continuous driving, the center of gravity of the vehicle is lifted, and the right front wheel and the left rear wheel have the risk of leaving the ground, so that the vehicle has the risk of losing control. When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted, and when the compression amplitude of the left front shock absorber assembly 2 is greater than the compression amplitude of the left rear shock absorber assembly 2, the amount of oil discharged from the left front shock absorber assembly 2 into the first chamber 243 is greater than the amount of oil discharged from the left rear shock absorber assembly 2 into the third chamber 245, so that the moving piece 241 moves to the right to press the third chamber 245 and the fourth chamber 246, the oil in the third chamber 245 can be discharged into the lower chamber 2012 of the left rear shock absorber assembly 2 to make the piston rod 203 move up, 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 make the piston rod 203 move up, thereby reducing the possibility of the left rear wheel and the right front wheel leaving the ground and improving the stability of the vehicle.

[0129] Of course, it can be understood that the above several cases are only exemplary descriptions, and when the vehicle encounters other working conditions such as the right front wheel being lifted, the left rear wheel being lifted, and the like, the oil flows according to the linkage principle described above to avoid the vehicle from tilting, and each working condition will not be described in detail here.

[0130] In some embodiments of the present application, as shown in Figure 24 The moving piece 241 includes a moving body part 2410, and the intermediate contact part 2411 is an annular protrusion provided on the moving body part 2410. In the moving direction of the moving piece 241, the second cylinder body 240 is provided with an intermediate cavity, a left cavity and a right cavity, and the extension inlet of the left cavity and the extension inlet of the right cavity are located on the inner wall of the intermediate cavity. The left end of the moving body part 2410 extends into the left cavity through the extension inlet of the left cavity, and the right end of the moving body part 2410 extends into the right cavity through the extension inlet of the right cavity.

[0131] The left end of the moving body part 2410 and the left cavity define a first chamber 243, a part of the moving body part 2410 is in sliding fit with the inner wall of the left cavity, the intermediate contact part 2411 is in sliding fit with the inner wall of the intermediate cavity to define a second chamber 244 and a third chamber 245, and the right end of the moving body part 2410 and the right cavity define a fourth chamber 246. Thus, the structure of the central control cylinder 24 is simple.

[0132] Further, as shown in Figure 24As shown, the central control cylinder 24 further comprises a first reset spring 247 and a second reset spring 248, two ends of the first reset spring 247 are respectively abutted against the second cylinder body 240 and the left end of the moving piece 241, two ends of the second reset spring 248 are respectively abutted against the second cylinder body 240 and the right end of the moving piece 241, the first reset spring 247 and the second reset spring 248 push the moving piece 241 to reset towards the middle. Specifically, when the vehicle leans to the left so that the moving piece 241 moves to the left, the first reset spring 247 can push the moving piece 241 to the right so that the moving piece 241 resets. When the vehicle leans to the right so that the moving piece 241 moves to the right, the second reset spring 248 can push the moving piece 241 to the left so that the moving piece 241 resets, thereby ensuring the reliability of the central control cylinder 24.

[0133] In some examples of the present application, as shown in Figure 24 As shown, the central control cylinder 24 comprises a guide assembly 249, the guide assembly 249 comprises a first guide piece 2490 and a second guide piece 2491, the first guide piece 2490 and the second guide piece 2491 are slidingly fitted, the first guide piece 2490 is fixed on the second cylinder body 240, the second guide piece 2491 is fixed on the moving piece 241, the first reset spring 247 is sleeved on the left guide assembly 249 and abutted against the first guide piece 2490, the second reset spring 248 is sleeved on the right guide assembly 249 and abutted against the first guide piece 2490, thereby by setting the guide assembly 249, not only the assembly of the first reset spring 247 and the second reset spring 248 is facilitated, but also the deformation degree of the first reset spring 247 and the second reset spring 248 is limited, avoiding the failure of the first reset spring 247 and the second reset spring 248 due to excessive deformation.

[0134] Further, the second guide piece 2491 is a screw, one end of the second guide piece 2491 extends into the first guide piece 2490 to be slidingly fitted with the first guide piece 2490, thereby the structure of the guide assembly 249 is simple and reliable.

[0135] As shown in Figure 25 As shown, the ports of the central control cylinder 24 connected with the piston rods 203 of the four shock absorber assemblies 2 are located on the same side, thereby facilitating the pipeline connection.

[0136] As shown in Figures 1-23 In some embodiments of the present application, as shown in

[0137] Further, as shown in Figures 1-23The damping spring 205 of the left front shock absorber assembly 2 is fixed to the shock absorber 200. The damping spring 205 of the right front shock absorber assembly 2 is fixed to the shock absorber 200. The damping spring 205 of the left rear shock absorber assembly 2 is arranged in parallel with the shock absorber 200. The damping spring 205 of the right rear shock absorber assembly 2 is arranged in parallel with the shock absorber 200.

[0138] The following is for reference. Figures 1-21 The hydraulic suspension system 1000 according to several specific embodiments of the present invention is described in detail. It is understood that each embodiment described above is merely an exemplary description and not a limiting description, and exemplary modifications can be made to each embodiment according to actual circumstances.

[0139] Example 1:

[0140] like Figure 1 As 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 adjustment valve 8. The accumulator module includes a first accumulator 9, a second accumulator 10, and a pressure-reducing accumulator 30.

[0141] Both the left front shock absorber assembly 2 and the right front shock absorber assembly 2 include a shock absorber 200 and a damping spring 205, with the damping spring 205 being sleeved and fixed to 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 damping spring 205, arranged side-by-side. The two ends of the damping spring 205 in the left rear shock absorber assembly 2 are connected to the vehicle body and the axle, respectively. The two ends of the damping spring 205 in the right rear shock absorber assembly 2 are also connected to the vehicle body and the axle, respectively. 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 disposed within 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, which communicates with the lower chamber 2012. The oil passage 204 of each shock absorber assembly 2 is connected to a reservoir 1 through a connecting channel. A first control valve 3 is provided on each connecting channel.

[0142] The reservoir 1 has an oil outlet and an oil inlet, and the control pump 26 is connected to the oil outlet and the connecting channel respectively to guide the oil in the reservoir 1 to the connecting channel. The oil return valve 27 is connected to the oil inlet and the connecting channel respectively, and when the oil return valve 27 is opened, the oil flows from the connecting channel to the oil inlet. The one-way valve 28 is arranged at the outlet end of the control pump 26 and is one-way. The pressure stabilizing accumulator 29 is arranged between the one-way valve 28 and the control pump 26 at the outlet end of the control pump 26, and the pressure stabilizing accumulator 29 can stabilize and eliminate the flow fluctuation at the outlet end of the control pump 26.

[0143] The hydraulic suspension system 1000 includes a common flow path and four branch flow paths, and the four branch flow paths are connected to the oil channels 204 of the four sets of shock absorber assemblies 2 respectively. The one-way valve 28 and the oil return valve 27 are connected to the common flow path respectively. The pressure relief valve 31 is connected to the common flow path.

[0144] The first control valve 3 corresponding to each shock absorber assembly 2 is connected in series on the corresponding branch flow path, and the first control valve 3 is used to control the branch flow path to be turned on or turned off.

[0145] The second accumulator 10 corresponding to each shock absorber assembly 2 is connected to the corresponding branch flow path, and the oil inlet and outlet of the second accumulator 10 is provided with the stiffness adjusting valve 11, and the stiffness adjusting valve 11 is in a normally closed state.

[0146] The opening degree adjusting valve 8, the first accumulator 9 and the second control valve 12 are also arranged on each branch flow path, the opening degree adjusting valve 8 is used to adjust the flow through the corresponding branch flow path to adjust the damping of the hydraulic suspension system 1000. The first accumulator 9 can be energized. The second control valve 12 is arranged between the first accumulator 9 and the second accumulator 10.

[0147] A pressure relief accumulator 30 is arranged corresponding to each shock absorber assembly 2, and the pressure relief accumulator 30 corresponding to the front left shock absorber assembly 2 is directly connected to the piston rod 203 to communicate with the corresponding oil channel 204, and the pressure relief accumulator 30 corresponding to the front right shock absorber assembly 2 is directly connected to the piston rod 203 to communicate with the corresponding oil channel 204. The pressure relief accumulator 30 corresponding to the rear left shock absorber assembly 2 is connected to the corresponding branch flow path, and the pressure relief accumulator 30 corresponding to the rear right shock absorber assembly 2 is directly connected to the corresponding branch flow path.

[0148] Specifically, the hydraulic suspension system 1000 has a pressure boosting mode, a lifting mode and a height lowering mode. In the pressure boosting mode, the first control valve 3 is opened and the second control valve 12 is closed, the stiffness adjusting valve 11 is opened, and the control pump 26 operates so that the oil in the reservoir 1 flows through the four branch flow paths to the corresponding second accumulators 10 respectively to be energized. After each second accumulator 10 is energized, the stiffness adjusting valve 11 is closed.

[0149] In the lifting mode, the oil in the reservoir 1 or the oil in the accumulator module can enter the oil passage 204 of the left front shock absorber assembly 2, the oil passage 204 of the right front shock absorber assembly 2, 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, the hydraulic oil in each oil passage 204 flows into the lower chamber 2012, so that the hydraulic pressure in the lower chamber 2012 increases, the piston 202 moves upward, and the piston rod 203 moves 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.

[0150] In the height reduction mode, the oil can flow out of the oil passage 204 of the left front shock absorber assembly 2, the oil passage 204 of the right front shock absorber assembly 2, 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 respectively, the hydraulic pressure in the lower chamber 2012 of each shock absorber 200 decreases, the piston 202 moves downward, and the piston rod 203 moves 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 height of the vehicle body. It can be understood that in the height reduction mode, the oil discharged from each group of shock absorber assemblies 2 can be directly discharged to the reservoir 1, or can be discharged to the accumulator assembly for energy storage, or can be discharged to the reservoir 1 and the accumulator assembly at the same time.

[0151] When the pressure in the hydraulic suspension system 1000 is large, for example, the pressure at the outlet of the control pump 26 reaches a certain threshold value (30 MPa), the return valve 27 is opened for pressure relief to protect the hydraulic suspension system 1000 within the normal pressure range, at this time the oil in each shock absorber 200 can flow to the reservoir 1 through the connecting passage and the return valve 27.

[0152] If the pressure in the hydraulic suspension system 1000 is still large after pressure relief or the pressure is large during operation, the pressure relief valve 31 can be used to open for pressure relief to ensure reliable operation of the entire hydraulic suspension system 1000.

[0153] If the damping of the hydraulic suspension system 1000 is too large during the driving of the vehicle, the comfort is affected by the jolt of the vehicle body, the amount of oil in each branch flow path can be adjusted by the opening degree adjusting valve 8 to adjust the damping of the hydraulic suspension system 1000, when the opening degree of the opening degree adjusting valve 8 is reduced, the amount of oil flowing through the connecting channel is reduced, and the damping is increased. When the opening degree of the opening degree adjusting valve 8 is increased, the damping is reduced.

[0154] When the stiffness of the hydraulic suspension system 1000 is too large to reduce the comfort of the vehicle, the stiffness adjusting valve 11 can be controlled to be opened, and the oil in the second accumulator 10 can be supplemented into each branch flow path, so that the stiffness of the hydraulic suspension system 1000 can be reduced, and the buffering effect of the hydraulic suspension system 1000 on the jolt can be increased.

[0155] During the driving of the vehicle, if the vehicle is subjected to jolt impact and the like, the oil in the lower chamber 2012 of each shock absorber assembly 2 can enter the pressure relief accumulator 30 through the oil passage 204 to be stored, so as to achieve the purpose of rapid pressure reduction. Since the front axle of the vehicle needs to ensure driving stability, and the rear axle of the vehicle mainly needs to ensure comfort, the pressure relief accumulator 30 corresponding to the left front shock absorber assembly 2 is directly connected with the piston rod 203 to communicate with the corresponding oil passage 204, and the pressure relief accumulator 30 corresponding to the right front shock absorber assembly 2 is directly connected with the piston rod 203 to communicate with the corresponding oil passage 204, so that rapid pressure relief can be achieved. The pressure relief 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 is first damped and then pressure relieved, which is beneficial to improve the comfort.

[0156] Embodiment 2:

[0157] As shown in Figure 2 Compared with embodiment 1, the hydraulic suspension system 1000 according to the present embodiment further comprises a central accumulator 13 and a central accumulator adjusting valve 32, the oil inlet and outlet of the central accumulator 13 are connected with the central accumulator adjusting valve 32, and the central accumulator adjusting valve 32 is connected to the common flow path. It needs to be noted that in this embodiment, the same structures and modes as in embodiment 1 will not be described in detail.

[0158] In the boost mode, the central accumulator adjusting valve 32 is opened and the stiffness adjusting valve 11 is opened, and the oil discharged from the reservoir 1 is stored in the central accumulator 13 and the second accumulator 10.

[0159] In the lifting mode, the central accumulator adjusting valve 32 is opened and the stiffness adjusting 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 is lifted to lift the vehicle body.

[0160] In the height lowering mode, the oil discharged from each shock absorber assembly 2 can be discharged to the central accumulator 13 and / or the reservoir 1.

[0161] Example 3:

[0162] As shown, the hydraulic suspension system 1000 according to the example of the present application also adds an anti-roll mode compared to the example 1. Figures 3-8 As shown, the upper chamber 2011 of the left front shock absorber assembly 2 is in communication with the lower chamber 2012 of the right front shock absorber assembly 2 through a first pipe, and the lower chamber 2012 of the left front shock absorber assembly 2 is in communication with the upper chamber 2011 of the right front shock absorber assembly 2 through a second pipe.

[0163] Figures 3-8 The upper chamber 2011 of the left rear shock absorber assembly 2 is in communication with the lower chamber 2012 of the right rear shock absorber assembly 2 through a third pipe, and the lower chamber 2012 of the left rear shock absorber assembly 2 is in communication with the upper chamber 2011 of the right rear shock absorber assembly 2 through a fourth pipe. The first pipe and the third pipe are in communication to form a first loop, and the second pipe and the fourth pipe are in communication to form a second loop. The hydraulic suspension system 1000 further comprises a first adjusting accumulator 14 and a second adjusting accumulator 15, the first adjusting accumulator 14 is connected to the first loop, and the oil inlet and outlet of the first adjusting accumulator 14 is provided with a first adjusting valve 18; the second adjusting accumulator 15 is connected to the second loop, and the oil inlet and outlet of the second adjusting accumulator 15 is provided with a second adjusting valve 19.

[0164] Specifically, as shown, when the vehicle has a tendency to roll, i.e. the hydraulic suspension system 1000 is in a one-side compression and one-side stretching phenomenon, 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 and the lower chamber 2012 of 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.

[0165] Specifically, as shown, when the vehicle has a tendency to roll, i.e. the hydraulic suspension system 1000 is in a one-side compression and one-side stretching phenomenon, 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 and the lower chamber 2012 of 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. Figure 8

[0166] ​​The oil 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 can enter into the upper chamber 2011 of the right rear shock absorber assembly 2 through the second circuit, so that 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 are lowered, thereby a downward force can be provided to the right side of the vehicle body, so that the vehicle can keep consistent, and the hydraulic suspension system 1000 can provide an anti-roll torque to prevent the vehicle from continuing to roll. It can be understood that the above description of the oil flow path is only an example to introduce the anti-roll principle, and when the right side is compressed and the left side is stretched, the hydraulic suspension system 1000 can provide an anti-roll force by using the above anti-roll principle.

[0167] As shown in FIG. 1, the first control valve 3 is opened, the second control valve 12 is closed, and the stiffness adjustment valve 11 is opened to charge each second accumulator 10. Figure 4 As shown in FIG. 1, the first control valve 3 is opened, the second control valve 12 is closed, and the stiffness adjustment valve 11 is opened to charge each second accumulator 10.

[0168] Figure 5 As shown in FIG. 1, in the lifting working condition, the first control valve 3 is closed, the second control valve 12 is opened, and the stiffness adjustment valve 11 is opened, and the oil in the second accumulator 10 can enter into the oil passage 204 of the corresponding shock absorber 200 to realize lifting.

[0169] As shown in FIG. 1, in the lifting working condition, the first control valve 3 is closed, the second control valve 12 is opened, and the stiffness adjustment valve 11 is opened, and the oil in the second accumulator 10 can enter into the oil passage 204 of the corresponding shock absorber 200 to realize lifting. Figure 6 As shown in FIG. 1, in the height lowering working condition, the first control valve 3 is opened, the second control valve 12 is opened, and the stiffness adjustment valve 11 is closed, and the piston rod 203 of each shock absorber 200 moves downward, so that the oil in the lower chamber 2012 is discharged to the branch flow path through the oil passage 204, and the oil in the four branch flow paths is collected to the common flow path and then discharged to the reservoir 1 through the oil return valve 27.

[0170] Figure 7 As shown in FIG. 1, in the height lowering working condition, the first control valve 3 is opened, the second control valve 12 is opened, and the stiffness adjustment valve 11 is closed, and the piston rod 203 of each shock absorber 200 moves downward, so that the oil in the lower chamber 2012 is discharged to the branch flow path through the oil passage 204, and the oil in the four branch flow paths is collected to the common flow path and then discharged to the reservoir 1 through the oil return valve 27.

[0171] Embodiment 4:

[0172] As shown in FIG. 1, in the height lowering working condition, the first control valve 3 is opened, the second control valve 12 is opened, and the stiffness adjustment valve 11 is closed, and the piston rod 203 of each shock absorber 200 moves downward, so that the oil in the lower chamber 2012 is discharged to the branch flow path through the oil passage 204, and the oil in the four branch flow paths is collected to the common flow path and then discharged to the reservoir 1 through the oil return valve 27.​​Figure 9 As shown, compared with the embodiment 1, in this embodiment, the hydraulic suspension system 1000 according to the embodiment of the present application also has an anti-pitch mode.

[0173] The upper chamber 2011 of the left front damper assembly 2 is communicated with the lower chamber 2012 of the left rear damper assembly 2 through the fifth pipeline, and the lower chamber 2012 of the left front damper assembly 2 is communicated with the upper chamber 2011 of the left rear damper assembly 2 through the sixth pipeline.

[0174] The upper chamber 2011 of the right front damper assembly 2 is communicated with the lower chamber 2012 of the right rear damper assembly 2 through the seventh pipeline, and the lower chamber 2012 of the right front damper assembly 2 is communicated with the upper chamber 2011 of the right rear damper assembly 2 through the eighth pipeline. The fifth pipeline is communicated with the seventh pipeline through the first connecting pipeline to form a third loop, and the sixth pipeline is communicated with the eighth pipeline through the second connecting pipeline to form a fourth loop. The hydraulic suspension system 1000 further comprises a third adjusting accumulator 16 and a fourth adjusting accumulator 17, the third adjusting accumulator 16 is connected to the third loop, and the oil inlet and outlet of the third adjusting accumulator 16 is provided with a third adjusting valve 20. The fourth adjusting accumulator 17 is connected to the fourth loop, and the oil inlet and outlet of the fourth adjusting accumulator 17 is provided with a fourth adjusting valve 21. The first connecting pipeline is provided with a first on-off valve 22 for conducting or cutting off the first connecting pipeline, and the second connecting pipeline is provided with a second on-off valve 23 for conducting or cutting off the second connecting pipeline.

[0175] Specifically, when the vehicle has a pitch 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 rod 203 of the left front damper assembly 2 and the piston rod 203 of the right front damper assembly 2 are compressed, the oil in the lower chamber 2012 of the left front damper assembly 2 flows into the upper chamber 2011 of the left rear damper assembly 2 through the sixth pipeline, so that the piston rod 203 of the left rear damper assembly 2 is lowered.

[0176] The oil in the lower chamber 2012 of the right front damper assembly 2 flows into the upper chamber 2011 of the right rear damper assembly 2 through the eighth pipeline, so that the piston rod 203 of the right front damper assembly 2 is lowered. Thus, the hydraulic suspension system 1000 can provide an anti-pitch force to prevent the vehicle from continuing to pitch.

[0177] By forming the third loop and the fourth loop, the linkage adjustment of the right front damper assembly 2, the right rear damper assembly 2, the left front damper assembly 2 and the left rear damper assembly 2 can be realized, further ensuring that an anti-pitch torque can be provided to prevent the vehicle from continuing to pitch. By controlling the opening and closing states of the third adjusting valve 20 and the fourth adjusting valve 21, the stiffness of the hydraulic suspension system 1000 can be adjusted, for example, when the third adjusting valve 20 and the fourth adjusting valve 21 are closed, the stiffness of the hydraulic suspension system 1000 can be increased.

[0178] When the first on-off valve 22 is closed, the fifth pipeline and the seventh pipeline are disconnected and turned on, and when the second on-off valve 23 is closed, the sixth pipeline and the eighth pipeline are disconnected and turned on, so that it can be determined whether the four groups of damper assemblies 2 need to be linked according to the actual demand.

[0179] Of course, it can be understood that the above description of the flow path of the oil 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 by using the above anti-pitching principle.

[0180] Embodiment 5:

[0181] As Figure 10 shown, compared with embodiment 4, the hydraulic suspension system 1000 according to the embodiment of the present application is not provided with the second accumulator 10, and further comprises a central accumulator 13, a first height maintaining branch and a second height maintaining branch. The first height maintaining branch is connected with the oil passage 204 of the left front damper assembly 2 and the oil passage 204 of the right front damper assembly 2 respectively, and is provided with a first height control valve 6 for turning on or turning off the first height maintaining branch.

[0182] The second height maintaining branch is connected with the oil passage 204 of the left rear damper assembly 2 and the oil passage 204 of the right rear damper assembly 2 respectively, and is provided with a second height control valve 7 for turning on or turning off the second height maintaining branch.

[0183] Specifically, when the first height control valve 6 is opened, the first height maintaining branch is turned on; when the first height control valve 6 is closed, the first height maintaining branch is turned off. When the second height control valve 7 is opened, the second height maintaining branch is turned on; when the second height control valve 7 is closed, the second height maintaining branch is turned off.

[0184] When it is needed to maintain the height of the vehicle body, the hydraulic suspension system 1000 can be switched into 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 turned on, the oil passage 204 of the left front damper assembly 2 and the oil passage 204 of the right front damper assembly 2 are communicated; the oil passage 204 of the left rear damper assembly 2 and the oil passage 204 of the right rear damper assembly 2 are communicated. That is, the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the right front damper assembly 2 are in a linked state, and the piston rod 203 of the left rear damper assembly 2 and the piston rod 203 of the right rear damper assembly 2 are in a linked state, so that the vehicle body can maintain the current height as much as possible.

[0185] In the height holding mode, the first control valve 3 and the second control valve 12 are kept closed.

[0186] In this embodiment, in the pressurization mode, the first control valve 3 is closed, and the oil in the reservoir 1 is discharged to the central accumulator 13 for energy storage.

[0187] Example 6:

[0188] like Figure 11 As shown, in this embodiment, compared with embodiment 4, the hydraulic suspension system 1000 according to the present invention further includes a central control cylinder 24.

[0189] The central control cylinder 24 includes a second cylinder body 240 and a movable member 241. The movable member 241 is movably disposed within the second cylinder body 240 and cooperates with the second cylinder body 240 to define a first chamber 243, a second chamber 244, a third chamber 245, and a fourth chamber 246. The first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are arranged sequentially in the moving direction of the movable member 241. The first chamber 243 and the second chamber 244 are distributed on one side of the intermediate contact portion 2411 of the movable 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 movablely engaged with the inner wall of the second cylinder body 240.

[0190] 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 ease of description, the following principle description will be based on the example 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.

[0191] Specifically, when the vehicle exhibits a tendency to roll, for example, when 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, 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. Because the first chamber 2... 43 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 opposing forces cancel each other out, so that the moving part 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, which can suppress the roll.

[0192] When the left front wheel of the vehicle encounters an obstacle such as a rock, the left front wheel lifts up, causing the compression amplitude of the left front shock absorber assembly 2 to be greater than that of the left rear shock absorber assembly 2. As a result, 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. This causes the moving part 241 to move to the right, compressing 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, causing the piston rod 203 to move upward. The oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2, causing the piston rod 203 to move upward. This reduces the possibility of the left rear wheel and the right front wheel leaving the ground and improves the stability of the vehicle. It is understandable that the above situations are merely illustrative. When the vehicle encounters other operating conditions, such as the right front wheel lifting up or the left rear wheel lifting up, the fluid will flow according to the above linkage principle to prevent the vehicle from tilting. Therefore, each operating condition will not be described in detail here.

[0193] It is understood that the hydraulic suspension system 1000 of this embodiment also has the anti-pitch mode described in embodiment 4, which will not be repeated here.

[0194] Example 7:

[0195] like Figures 12-19 As shown, in this embodiment, compared with embodiment 4, the hydraulic suspension system 1000 according to the present invention omits the second accumulator 10, and the hydraulic suspension system 1000 according to the present invention is provided with a central accumulator 13, a central control cylinder 24, a first height holding branch and a second height holding branch.

[0196] The oil inlet and outlet of the central accumulator 13 are connected to a central accumulator regulating valve 32, which is connected to a common flow path.

[0197] The central control cylinder 24 includes a second cylinder body 240 and a movable member 241. The movable member 241 is movably disposed within the second cylinder body 240 and cooperates with the second cylinder body 240 to define a first chamber 243, a second chamber 244, a third chamber 245, and a fourth chamber 246. The first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are arranged sequentially in the moving direction of the movable member 241. The first chamber 243 and the second chamber 244 are distributed on one side of the intermediate contact portion 2411 of the movable 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 movablely engaged with the inner wall of the second cylinder body 240.

[0198] 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.

[0199] The first height holding branch is 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 respectively. The first height holding branch is provided with a first height control valve 6 for opening or closing it.

[0200] The second height holding branch is 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 respectively. The second height holding branch is provided with a second height control valve 7 for opening or closing it.

[0201] Specifically, for ease of description, the following description will use the following example: 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.

[0202] Specifically, such as Figure 13 As shown, the hydraulic suspension system 1000 enters the boost mode, the central energy storage regulating valve 32 opens and the four first control valves 3 close, the first height control valve 6 closes and the second height control valve 7 closes, and the oil flowing out of the reservoir 1 is discharged to the central energy storage tank 13 for energy storage.

[0203] As shown in FIG. 1, when the vehicle enters the lift mode, the central accumulator regulating valve 32 is opened, the four first control valves 3 are opened, the first height control valve 6 is closed, and the second height control valve 7 is closed. Figure 14

[0204] The oil discharged from the central accumulator 13 enters the oil passage 204 of the four shock absorber assemblies 2 through the four branch passages, respectively, and the oil in the oil passage 204 enters the lower chamber 2012 to move the piston rod 203 upward to raise the vehicle body.

[0205] As shown in FIG. 1, when the vehicle enters the lift mode, the central accumulator regulating valve 32 is opened, the four first control valves 3 are opened, the first height control valve 6 is closed, and the second height control valve 7 is closed. Figure 15 As shown in FIG. 1, when the vehicle enters the lift mode, the central accumulator regulating valve 32 is opened, the four first control valves 3 are opened, the first height control valve 6 is closed, and the second height control valve 7 is closed.

[0206] Figure 16 As shown in FIG. 1, when the vehicle enters the lift mode, the central accumulator regulating valve 32 is opened, the four first control valves 3 are opened, the first height control valve 6 is closed, and the second height control valve 7 is closed.

[0207] The oil discharged from the lower chamber 2012 of each shock absorber assembly 2 flows back to the reservoir 1 through the connection passage and the oil return valve 27, so that each piston rod 203 moves downward to lower the height of the vehicle body.

[0208] As shown in FIG. 1, when the vehicle enters the lift mode, the central accumulator regulating valve 32 is opened, the four first control valves 3 are opened, the first height control valve 6 is closed, and the second height control valve 7 is closed. Figure 17 As shown in FIG. 1, when the vehicle enters the lift mode, the central accumulator regulating valve 32 is opened, the four first control valves 3 are opened, the first height control valve 6 is closed, and the second height control valve 7 is closed.

[0209] ​​When the vehicle exhibits 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, while 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. Because the first chamber 243 and... The third chamber 245 is 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 opposing forces cancel each other out, so that the moving part 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, which can suppress the roll.

[0210] When the left front wheel of the vehicle encounters an obstacle such as a rock, the left front wheel lifts up, causing the compression amplitude of the left front shock absorber assembly 2 to be greater than that of the left rear shock absorber assembly 2. As a result, 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. This causes the moving part 241 to move to the right, compressing 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, causing the piston rod 203 to move upward. The oil in the fourth chamber 246 can be discharged into the lower chamber 2012 of the right front shock absorber assembly 2, causing the piston rod 203 to move upward. This reduces the possibility of the left rear wheel and the right front wheel leaving the ground and improves the stability of the vehicle.

[0211] It is understandable that the above situations are merely illustrative. When the vehicle encounters other operating conditions, such as the right front wheel lifting up or the left rear wheel lifting up, the fluid will flow according to the above linkage principle to prevent the vehicle from tilting. Therefore, each operating condition will not be described in detail here.

[0212] like Figure 18 As shown, the third regulating valve 20 is open and the fourth regulating valve 21 is open, 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 open and the second on / off valve 23 is open.

[0213] When the vehicle has a pitch 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 rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are compressed, while the piston rod 203 of the left rear shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 are 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 drop.

[0214] Oil in the lower chamber 2012 of the right front shock absorber assembly 2 enters the upper chamber 2011 of the right rear shock absorber assembly 2 through the eighth pipe, 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-pitch force to prevent the vehicle from continuing to pitch.

[0215] By forming the third and fourth circuits, 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 linked for adjustment, further ensuring that anti-pitch moment can be provided to prevent the vehicle from continuing to pitch. The stiffness of the hydraulic suspension system 1000 can be adjusted by controlling the opening and closing states of the third adjusting valve 20 and the fourth adjusting valve 21. For example, when the third adjusting valve 20 and the fourth adjusting valve 21 are closed, the stiffness of the hydraulic suspension system 1000 can be increased.

[0216] It is understandable that the above description of the oil flow path is merely an illustrative description to illustrate 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 by utilizing the above anti-pitch principle.

[0217] It is understandable that when the hydraulic suspension system 1000 according to embodiments of the present invention is applied in an off-road vehicle, in order to improve the off-road RTI index, such as... Figure 19 As 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 open and the second height regulating valve 7 is open.

[0218] Utilizing the anti-roll and height-holding principles described above, the hydraulic suspension system 1000 can provide anti-roll force and vehicle height-holding force when the off-road vehicle is traversing rugged mountain roads, thus making it less prone to roll.

[0219] Example 8:

[0220] like Figure 20As shown, in this embodiment, compared with the hydraulic suspension system 1000 of embodiment 1, the hydraulic suspension system 1000 of the embodiment of the present application further comprises: a central control cylinder 24, a first height maintaining branch and a second height maintaining branch.

[0221] The central control cylinder 24 comprises a second cylinder body 240 and a moving piece 241, the moving piece 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 sequentially arranged in the moving direction of the moving piece 241, the first chamber 243 and the second chamber 244 are distributed on one side of a middle contact part 2411 of the moving piece 241, the third chamber 245 and the fourth chamber 246 are distributed on the other side of the middle contact part 2411, and the middle contact part 2411 is movably cooperated with the inner wall of the second cylinder body 240.

[0222] The oil passage 204 of the left front shock absorber assembly 2 is connected with 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 with the other one of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear shock absorber assembly 2 is connected with 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 with the other one of the third chamber 245 and the fourth chamber 246. In the following, for the convenience of description, the oil passage 204 of the left front shock absorber assembly 2 is connected with the first chamber 243, the oil passage 204 of the right rear shock absorber assembly 2 is connected with the second chamber 244, the oil passage 204 of the left rear shock absorber assembly 2 is connected with the third chamber 245, and the oil passage 204 of the right front shock absorber assembly 2 is connected with the fourth chamber 246 are taken as examples for principle description.

[0223] Specifically, when the vehicle has a roll tendency, for example, 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 are compressed, and 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 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 the two sides of the middle contact part 2411, the direction of the force of the oil in the first chamber 243 on the middle contact part 2411 is opposite to the direction of the force of the oil in the third chamber 245 on the middle contact part 2411, the two opposite forces cancel each other out so that the moving piece 241 does not move, thereby 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 can be inhibited, and the roll can be inhibited.

[0224] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted so that the compression amplitude of the left front shock absorber assembly 2 is greater than the compression amplitude of the left rear shock absorber assembly 2, the amount of oil discharged from the left front shock absorber assembly 2 into the first chamber 243 is greater than the amount of oil discharged from the left rear shock absorber assembly 2 into the third chamber 245, so that the moving piece 241 moves to the right to press the third chamber 245 and the fourth chamber 246, the oil in the third chamber 245 can be discharged into the lower chamber 2012 of the left rear shock absorber assembly 2 to make the piston rod 203 move upwards, 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 make the piston rod 203 move upwards, thereby reducing the possibility of the left rear wheel and the right front wheel leaving the ground and improving the stability of the vehicle.

[0225] Of course, it can be understood that the above several cases are only exemplary descriptions, and 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 linkage principle described above to avoid the vehicle from tilting, and each working condition will not be described in detail here.

[0226] The first height maintaining branch is connected with 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 respectively, and a first height control valve 6 for conducting or cutting off the first height maintaining branch is arranged on the first height maintaining branch.

[0227] The second height maintaining branch is connected with 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 respectively, and a second height control valve 7 for conducting or cutting off the second height maintaining branch is arranged on the second height maintaining branch.

[0228] 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.

[0229] When it is necessary to maintain the height of the vehicle body, the hydraulic suspension system 1000 can be switched into a 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 right rear shock absorber assembly 2 are communicated. That is, the piston rod 203 of the left front shock absorber assembly 2 and the piston rod 203 of the right front shock absorber assembly 2 are in a linkage state, and the piston rod 203 of the left rear shock absorber assembly 2 and the piston rod 203 of the right rear shock absorber assembly 2 are in a linkage state, so that the vehicle body can maintain the current height as much as possible.

[0230] Example 9:

[0231] like Figure 21 As shown, in this embodiment, compared with embodiment 8, the hydraulic suspension system 1000 according to the present invention does not have a second control valve 12, and the hydraulic suspension system 1000 includes a central accumulator 13.

[0232] It should be noted that in this embodiment, in the pressurization mode, the oil in the reservoir 1 flows to the central accumulator 13 and the second accumulator 10 for energy storage.

[0233] The hydraulic suspension system 1000 of this embodiment has the same mode as that in embodiment 8, and will not be described here.

[0234] It should be noted that the above nine embodiments are merely illustrative examples, and each embodiment does not exhaustively describe all the modes of the hydraulic suspension system 1000. All nine embodiments have lifting mode, height reduction mode, damping adjustment, etc., which will not be described in detail in each embodiment here.

[0235] The vehicle according to an embodiment of the present invention includes a hydraulic suspension system 1000 as described in any of the above embodiments of the present invention.

[0236] According to embodiments of the present invention, the vehicle height can be adjusted based on road conditions. For example, when traversing rugged mountain roads, a lift mode can be entered to raise the vehicle's center of gravity and improve driving stability. When it is necessary to reduce the vehicle's impact on driving speed, a lowering mode can be entered to lower the vehicle's center of gravity. It is understood that the above is merely an exemplary description, and the vehicle height can be adjusted according to actual needs during driving.

[0237] According to embodiments of the present invention, the vehicle body height can be adjusted, improving the vehicle's handling stability without compromising vehicle comfort, effectively resolving the contradiction between vehicle comfort and handling stability. Simultaneously, the use of a hollow piston rod 203 not only reduces weight but also utilizes the oil passage 204 defined by the hollow piston rod 203 to allow oil to flow in or out, adjusting the position of the piston rod 203. This adjustment method is simple, highly reliable, low-cost, and has a fast response speed. Furthermore, because 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 a reservoir, the oil circuit connection is stable, preventing wear at the connection due to vibration and minimizing leakage.

[0238] Other configurations of the vehicle according to the embodiments of the present application, such as a brake system and the like, and operations are known to those skilled in the art, and thus will not be described in detail herein.

[0239] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The exemplary description of the above terms does not necessarily refer to the same embodiment or example in the present specification. Also, the specific feature, structure, material or characteristic described can be combined in any suitable manner in one or more embodiments or examples.

[0240] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hydraulic suspension system, characterized by The hydraulic suspension device is used for adjusting the height of the vehicle body, and comprises: a liquid storage device adapted to be arranged on the vehicle body and used for storing oil liquid; and a shock absorber having a shock absorber housing adapted to be connected with the axle, a piston located in the shock absorber housing and cooperating with the shock absorber housing to define an upper chamber and a lower chamber, and a piston rod having one end connected with the piston and adapted to be connected with the vehicle body, wherein an oil liquid passage is arranged in the piston rod and communicates the lower chamber with the liquid storage device to enable the oil liquid to flow between the liquid storage device and the lower chamber; a plurality of shock absorber assemblies, each of which comprises the shock absorber; 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, and 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, and 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; the fifth pipeline communicates with the seventh pipeline through a first connecting pipeline to form a third loop, and the sixth pipeline communicates with the eighth pipeline through a second connecting pipeline to form a fourth loop; the fifth pipeline communicates with the seventh pipeline through the first connecting pipeline to form the third loop, and the sixth pipeline communicates with the eighth pipeline through the second connecting pipeline to form the fourth loop; a first on-off valve is arranged on the first connecting pipeline to turn on or turn off the first connecting pipeline, and a second on-off valve is arranged on the second connecting pipeline to turn on or turn off the second connecting pipeline; a central control cylinder comprising a second cylinder body and a moving member movably arranged in the second cylinder body and cooperating with the second cylinder body to define a first chamber, a second chamber, a third chamber and a fourth chamber, which are sequentially arranged in the moving direction of the moving member; the oil liquid passage of the left front shock absorber assembly is connected with one of the first chamber and the second chamber, the oil liquid passage of the right rear shock absorber assembly is connected with the other of the first chamber and the second chamber, the oil liquid passage of the left rear shock absorber assembly is connected with one of the third chamber and the fourth chamber, and the oil liquid passage of the right front shock absorber assembly is connected with the other of the third chamber and the fourth chamber; The hydraulic suspension device further comprises a first height maintaining branch and a second height maintaining branch, the first height maintaining branch is connected with the oil passage of the left front shock absorber assembly and the oil passage of the right front shock absorber assembly respectively, the first height maintaining branch is provided with a first height control valve for conducting or cutting off the first height maintaining branch, the second height maintaining branch is connected with the oil passage of the left rear shock absorber assembly and the oil passage of the right rear shock absorber assembly respectively, the second height maintaining branch is provided with a second height control valve for conducting or cutting off the second height maintaining branch; The hydraulic suspension device further comprises a central accumulator and a central accumulator adjusting valve, the central accumulator adjusting valve is connected to the central accumulator, and the central accumulator adjusting valve is connected to the common flow path; The hydraulic suspension device further comprises a first control valve, and each group of shock absorber assemblies is connected to the central accumulator through the first control valve.

2. The hydraulic suspension system of claim 1, wherein, The hydraulic suspension device further comprises a control pump and a reservoir, and the control pump is arranged between the reservoir and the oil passage.

3. The hydraulic suspension system of claim 1, wherein, The upper end of the piston rod extends out of the shock absorber housing, and the upper end of the piston rod is provided with an oil port for connecting the oil passage and the reservoir.

4. The hydraulic suspension system of claim 2, wherein, The hydraulic suspension device further comprises an oil outlet passage and an oil return passage, the oil outlet passage and the oil return passage are connected between the reservoir and the oil passage, and the oil outlet passage and the oil return passage partially overlap, and the control pump is arranged on the oil outlet passage.

5. The hydraulic suspension system of claim 4, wherein, The oil outlet passage comprises a common passage and an oil outlet branch, the oil return passage comprises the common passage and an oil return branch, one end of the common passage is connected to the oil passage, and the oil outlet branch and the oil return branch are connected to the other end of the common passage.

6. The hydraulic suspension system of claim 5, wherein, A one-way valve and the control pump are arranged on the oil outlet branch, one end of the one-way valve is connected to the common passage, the other end of the one-way valve is connected to the control pump, and an oil return valve is arranged on the oil return branch.

7. The hydraulic suspension system of claim 1, wherein, The hydraulic suspension device further comprises an accumulator module, the oil passage is connected to the reservoir through a connecting passage, the accumulator module is connected to the connecting passage, 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.

8. The hydraulic suspension system of claim 7, wherein, The hydraulic suspension system further comprises a first control valve, the first control valve is arranged on the connecting passage and is used to control the connection or blockage of the reservoir and the accumulator module.

9. The hydraulic suspension system of claim 7, wherein, The accumulator module comprises a first accumulator and an opening adjusting valve, the first accumulator is connected to the connecting passage at a first connection point, the opening adjusting valve is arranged between the first connection point and the oil passage, the opening adjusting valve is used to adjust the opening of the connecting passage between the oil passage and the first connection point to adjust the damping of the shock absorber, and the opening adjusting 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.

10. The hydraulic suspension system of claim 7, wherein, The accumulator module further comprises a second accumulator and a stiffness adjustment valve, the connection passage is provided with a second connection point in communication with the second accumulator, the stiffness adjustment valve is arranged between the second accumulator and the second connection point, and the stiffness adjustment valve is used to communicate or cut off the connection passage and the second accumulator to adjust the stiffness of the shock absorber.

11. The hydraulic suspension system of claim 10, wherein, A second control valve is further arranged between the second connection point and the oil passage.

12. The hydraulic suspension system of claim 7, wherein, The accumulator module further comprises a first accumulator and a second accumulator, the first accumulator is in communication with the connection passage at a first connection point, and the connection passage is provided with a second connection point in communication with the second accumulator.

13. The hydraulic suspension system of claim 12, wherein, The first connection point is located between the oil passage and the second connection point.

14. The hydraulic suspension system of claim 12, wherein, A second control valve is arranged between the first connection point and the second connection point.

15. The hydraulic suspension system of claim 1, wherein, A controller is included, which is used to control the flow direction of the oil between the liquid storage device and the shock absorber according to the vehicle condition to increase or decrease the height of the vehicle body.

16. A vehicle characterized by comprising: The hydraulic suspension system of any one of claims 1-15 is included.

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