Hydraulic valve assembly, hydraulic system, and vehicle

Abstract

The application relates to the technical field of vehicles, and provides a hydraulic valve assembly, a hydraulic system and a vehicle. The hydraulic valve assembly, the hydraulic system and the vehicle at least comprise a valve body, a hydraulic pipeline and a control valve assembly. The hydraulic pipeline is integrated in the valve body, corresponding oil ports are arranged on the valve body, the oil gas spring is connected to the corresponding position of the hydraulic pipeline through the corresponding oil ports, and the on-off between the hydraulic pipeline and the corresponding oil ports is controlled through the control valve assembly, so that the action of the corresponding oil gas spring is controlled. In this way, the complexity of pipeline connection is reduced, and the problems of pressure loss, low efficiency and difficult assembly and maintenance of the hydraulic system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a hydraulic valve assembly, a hydraulic system and a vehicle. BACKGROUND

[0002] Oil-gas suspensions are widely used in various vehicles such as off-road vehicles, and a hydraulic system is a core component of the oil-gas suspension, which determines the action effect of the terminal oil-gas spring. In the related art, the hydraulic system in the oil-gas suspension system in the vehicle is arranged in a scattered manner, and the pipeline connection is complex, which leads to large pressure loss, low efficiency and difficult assembly and maintenance of the system. SUMMARY

[0003] Therefore, it is necessary to provide a hydraulic valve assembly, a hydraulic system and a vehicle to improve the problems of pressure loss, low efficiency and difficult assembly and maintenance of the hydraulic system.

[0004] According to one aspect of the present application, an embodiment of the present application provides a hydraulic valve assembly, comprising:

[0005] a valve body having a containing cavity and an oil inlet, an oil return and a plurality of oil outlets connected to the containing cavity respectively, the oil outlet being used for outputting oil to an oil-gas spring or inputting oil in the oil-gas spring;

[0006] a hydraulic pipeline arranged in the containing cavity, the hydraulic pipeline being connected to the oil inlet, the oil return and the plurality of oil outlets respectively; and

[0007] a control valve assembly connected to the hydraulic pipeline, used for controlling the on-off between the hydraulic pipeline and the oil inlet, the oil return and the plurality of oil outlets, so as to control the action of the oil-gas spring.

[0008] In one embodiment, the hydraulic pipeline comprises an oil inlet pipeline, an oil return pipeline, a plurality of oil outlet pipelines and a plurality of first branch pipelines;

[0009] the inlet of the oil inlet pipeline is connected to the oil inlet, the outlet of the oil inlet pipeline is connected to the inlets of all the oil outlet pipelines respectively, and the oil outlet pipeline corresponds to the oil outlet one by one;

[0010] each first branch pipeline is connected between one oil outlet pipeline and the oil return pipeline, and the outlet of the oil return pipeline is connected to the oil return;

[0011] The control valve assembly is used for conducting or cutting off the oil inlet pipeline, the oil return pipeline, the oil outlet pipeline and the first branch pipeline.

[0012] In one embodiment, the control valve assembly comprises:

[0013] a plurality of first control valves, each of the oil outlet pipelines is provided with a first control valve, and along the oil inlet direction, the first control valve is located upstream of an end of the oil outlet pipeline connected to the corresponding first branch pipeline; the first control valve is used to open or cut off the corresponding oil outlet pipeline;

[0014] a plurality of second control valves, each of the oil outlet pipelines is provided with a second control valve, and along the oil inlet direction, the second control valve is located downstream of an end of the oil outlet pipeline connected to the corresponding first branch pipeline; the second control valve is used to open or cut off the corresponding oil outlet pipeline;

[0015] a plurality of third control valves, each of the first branch pipelines is provided with a third control valve, and the third control valve is used to open or cut off the corresponding first branch pipeline; and

[0016] a fourth control valve provided in the oil inlet pipeline, used to open or cut off the oil inlet pipeline.

[0017] In one of the embodiments, the first control valve is configured as a bidirectional switch; and / or

[0018] the second control valve is configured as a unidirectional switch, and the second control valve can allow the oil to flow in the oil return direction in the open state; and / or

[0019] the third control valve is configured as a bidirectional switch; and / or

[0020] the fourth control valve is configured as a bidirectional switch.

[0021] In one of the embodiments, the first control valve is configured as a solenoid valve; and / or

[0022] the second control valve is configured as a solenoid valve; and / or

[0023] the third control valve is configured as a solenoid valve; and / or

[0024] the fourth control valve is configured as a solenoid valve.

[0025] In one of the embodiments, the control valve assembly further comprises a plurality of fifth control valves;

[0026] each of the first branch pipelines is provided with a fifth control valve, and along the oil return direction, the fifth control valve is located downstream of the corresponding third control valve;

[0027] the fifth control valve is used to open or cut off the corresponding first branch pipeline.

[0028] In one of the embodiments, the fifth control valve is configured as a one-way switch, and in the on state, the fifth control valve is capable of allowing the oil to flow in the oil return direction.

[0029] In one of the embodiments, the hydraulic circuit further comprises a sixth control valve connected in parallel with the fourth control valve.

[0030] The sixth control valve is configured to be opened when the oil inlet pressure is greater than a preset pressure.

[0031] In one of the embodiments, the sixth control valve is configured as a relief valve.

[0032] In one of the embodiments, the hydraulic circuit further comprises a second branch circuit.

[0033] The second branch circuit is connected between the oil return circuit and the fourth control valve.

[0034] The fourth control valve is further configured to open or close the second branch circuit.

[0035] In one of the embodiments, the control valve assembly further comprises a seventh control valve.

[0036] The seventh control valve is arranged on the second branch circuit and configured to open or close the second branch circuit.

[0037] In one of the embodiments, the seventh control valve is configured as a one-way switch, and in the on state, the seventh control valve is capable of allowing the oil to flow in the oil return direction.

[0038] In one of the embodiments, the hydraulic valve assembly further comprises a pressure detection device arranged on the oil inlet circuit; and / or

[0039] The hydraulic valve assembly further comprises an oil inlet filter assembly arranged on the oil inlet path of the oil inlet circuit; and / or

[0040] The hydraulic valve assembly further comprises an oil return filter assembly arranged on the oil return path of the oil return circuit.

[0041] In one of the embodiments, a plurality of oil gas springs are provided; one of the oil outlets is used to communicate the rodless chambers of all the oil gas springs respectively, another oil outlet is used to communicate the rod chambers of all the oil gas springs respectively, and the rest of the oil outlets are in one-to-one correspondence with the oil gas springs, and the rest of the oil outlets are used to communicate the rodless chambers of the corresponding oil gas springs.

[0042] In one of the embodiments, the hydraulic valve assembly has a first state; in the first state, the control valve assembly is controllable to conduct the hydraulic line to the oil inlet port and controllable to conduct the hydraulic line to at least one of the remaining oil outlet ports to enable the corresponding oil gas spring to extend; and / or

[0043] the hydraulic valve assembly has a second state; in the second state, the control valve assembly is controllable to conduct the hydraulic line to the oil return port and controllable to conduct the hydraulic line to at least one of the remaining oil outlet ports to enable the corresponding oil gas spring to contract; and / or

[0044] the hydraulic valve assembly has a third state; in the third state, the control valve assembly is controllable to conduct the hydraulic line to the oil inlet port and controllable to conduct the hydraulic line to one of the oil outlet ports to enable all the oil gas springs to be locked; and / or

[0045] the hydraulic valve assembly has a fourth state; in the fourth state, the control valve assembly is controllable to conduct the hydraulic line to the oil return port and controllable to conduct the hydraulic line to one of the oil outlet ports to enable all the oil gas springs to be unlocked; and / or

[0046] the hydraulic valve assembly has a fifth state; in the fifth state, the control valve assembly is controllable to conduct the hydraulic line to the oil inlet port and controllable to conduct the hydraulic line to another one of the oil outlet ports to enable all the oil gas springs to be lifted; and / or

[0047] the hydraulic valve assembly has a sixth state; in the sixth state, the control valve assembly is controllable to conduct the hydraulic line to the oil return port and controllable to conduct the hydraulic line to another one of the oil outlet ports to enable all the oil gas springs to be lifted.

[0048] In one of the embodiments, all the oil outlet ports are arranged on the same side of the valve body.

[0049] In one of the embodiments, the control valve assembly is mounted on the outside of the valve body, and the mounting end of the control valve assembly extends into the accommodating cavity to be connected to the hydraulic line.

[0050] According to another aspect of the present application, the embodiments of the present application provide a hydraulic system comprising the hydraulic valve assembly in any of the above embodiments.

[0051] In one of the embodiments, the hydraulic system further comprises:

[0052] A bracket assembly is used to connect a target member;

[0053] An oil tank assembly is mounted on the bracket assembly and is used to store oil;

[0054] A driving assembly is mounted on the oil tank assembly and is used to provide a driving force for delivering oil in the oil tank assembly to the hydraulic valve assembly;

[0055] The oil return port is communicated with the oil tank assembly.

[0056] In one embodiment, the oil tank assembly comprises:

[0057] A tank body has a storage cavity for storing oil, and an oil outlet and an oil inlet respectively communicated with the storage cavity; the oil outlet is communicated with an input port of the driving assembly, and the oil inlet is used to input oil; and

[0058] An air vent valve assembly is arranged outside the tank body and is used to balance pressure in the tank body.

[0059] In one embodiment, the oil inlet is arranged on a side wall of the tank body; and / or

[0060] The oil tank assembly further comprises an oil return filter assembly arranged in the tank body; an input port of the oil return filter assembly is communicated with the oil return port, and an output port of the oil return filter assembly is communicated with the storage cavity; and / or

[0061] The oil tank assembly further comprises a liquid level indicator arranged in the tank body.

[0062] In one embodiment, the driving assembly comprises a motor assembly and an oil pump assembly connected with the motor assembly;

[0063] An input port of the oil pump assembly is communicated with the oil tank assembly, an output port of the oil pump assembly is communicated with the oil inlet, and the motor assembly is used to provide power for operation of the oil pump assembly.

[0064] According to another aspect of the present application, the embodiments of the present application provide a vehicle comprising the hydraulic system in any of the above embodiments.

[0065] In the hydraulic valve assembly, the hydraulic system and the vehicle, the hydraulic valve assembly at least comprises a valve body, a hydraulic pipeline and a control valve assembly; the hydraulic pipeline is integrated in the valve body, and corresponding oil ports are arranged on the valve body; the oil gas spring is connected to a corresponding position of the hydraulic pipeline through the corresponding oil ports, and the control valve assembly is used to control the connection and disconnection between the hydraulic pipeline and the corresponding oil ports, so as to control the action of the corresponding oil gas spring. In this way, the complexity of pipeline connection is reduced, and the problems of pressure loss, low efficiency and difficult assembly and maintenance of the hydraulic system are improved.

[0066] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0067] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are intended to illustrate but not limit the application and are, therefore, to be regarded as illustrative in nature. Like reference numerals designate like elements in the accompanying drawings. In the drawings:

[0068] Figure 1 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application;

[0069] Figure 2 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application; Figure 1 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application;

[0070] Figure 3 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application; Figure 2 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application;

[0071] Figure 4 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application; Figure 1 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application;

[0072] Figure 5 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application; Figure 1 Structure schematic diagram of hydraulic valve assembly in an embodiment of the present application;

[0073] Figure 6 Structure schematic diagram of hydraulic system in an embodiment of the present application;

[0074] Figure 7 Structure schematic diagram of hydraulic system in an embodiment of the present application; Figure 6 Structure schematic diagram of hydraulic system in an embodiment of the present application;

[0075] Figure 8 Structure schematic diagram of hydraulic system in an embodiment of the present application; Figure 6 Structure schematic diagram of hydraulic system in an embodiment of the present application.

[0076] Reference signs in the detailed description of the embodiments are as follows:

[0077] Oil gas spring 10, left front spring 11, right front spring 12, left rear spring 13, right rear spring 14;

[0078] Hydraulic system 20;

[0079] Hydraulic valve assembly 100;

[0080] Valve body 110, containing cavity r, oil inlet P, oil return port T, oil outlet C, A1, A2, B1, B2, K1, K2;

[0081] Hydraulic circuit 120, oil inlet circuit 121, oil return circuit 122, oil outlet circuit 123, 123a, 123b, 123c, 123d, 123e, 123f, first branch circuit 124, 124a, 124b, 124c, 124d, 124e, 124f, second branch circuit 125;

[0082] Control valve assembly 130, first control valve 131, 131a, 131b, 131c, 131d, 131e, 131f, second control valve 132, 132a, 132b, 132c, 132d, 132e, 132f, third control valve 133, 133a, 133b, 133c, 133d, 133e, 133f, fourth control valve 134, fifth control valve 135, 135a, 135b, 135c, 135d, 135e, 135f, sixth control valve 136, seventh control valve 137;

[0083] Pressure detection piece 140;

[0084] Oil inlet filter assembly L1;

[0085] Oil return filter assembly L2;

[0086] Support assembly 200;

[0087] Oil tank assembly 300, tank body 310, liquid outlet 311, liquid inlet 312, breather valve assembly 320, liquid level indicator 330;

[0088] Drive assembly 400, motor assembly 410, oil pump assembly 420;

[0089] Frame 30. DETAILED DESCRIPTION

[0090] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. The embodiments of the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application. Therefore, the embodiments of the present application are not limited to the specific embodiments disclosed below.

[0091] It should be understood that the terms "first", "second" and the like used in the description and in the claims of the present application are used to describe various professional names, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. However, unless otherwise specified, these professional names are not limited by these terms. These terms are only used to distinguish one professional name from another. In the description of the embodiments of the present application, the meaning of "a plurality of", "several" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0092] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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 internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0093] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0094] It should be noted that when an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element.

[0095] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the present application in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0096] Figure 1 The structure of the hydraulic valve assembly 100 in an embodiment of the present application is shown in the structural schematic diagram; Figure 2 The structure of the hydraulic valve assembly 100 in an embodiment of the present application is shown in the structural schematic diagram; Figure 1A structure diagram of the valve body 110 and the hydraulic pipeline 120 in the hydraulic valve assembly 100 is shown in the figure; Figure 3 A structure diagram in a schematic state is shown. Figure 2 A structure diagram in a schematic state is shown. Figure 3 The valve body 110 is shown in a dashed line.

[0097] In some embodiments, please refer to Figures 1 to 3 The hydraulic valve assembly 100 provided by the embodiments of the present application comprises a valve body 110, a hydraulic pipeline 120 and a control valve assembly. The valve body 110 has a receiving cavity r, and an oil inlet port P, an oil return port T and a plurality of oil outlet ports C which are respectively connected to the receiving cavity r. The oil outlet ports C are used to output or input oil to or from the oil gas spring 10. The hydraulic pipeline 120 is arranged in the receiving cavity r. The hydraulic pipeline 120 is connected to the oil inlet port P, the oil return port T and the plurality of oil outlet ports C. The control valve assembly is connected to the hydraulic pipeline 120 and is used to control the connection between the hydraulic pipeline 120 and the oil inlet port P, the oil return port T and the plurality of oil outlet ports C, so as to control the action of the oil gas spring 10.

[0098] The valve body 110 is a component for accommodating the hydraulic pipeline 120, that is, the hydraulic pipeline 120 is integrated in the valve body 110. The valve body 110 is provided with corresponding oil ports (i.e., the oil inlet port P, the oil return port T and the oil outlet ports C), and the oil gas spring 10 can be connected to the hydraulic pipeline 120 arranged in the valve body 110 through the corresponding oil ports. Specifically, a connecting pipeline which is connected to the hydraulic pipeline 120 can be arranged at the corresponding oil port, and the other end of the connecting pipeline is connected to the oil gas spring 10.

[0099] The hydraulic pipeline 120 is a pipeline for providing a flow channel and a circulation channel for oil. It can be understood that the hydraulic pipeline 120 is composed of a plurality of pipelines which can be integrated in the receiving cavity r of the valve body 110 through series connection, parallel connection and / or no direct connection and the like. In order to realize the functions of oil inlet, oil return and oil outlet, the number of oil gas springs 10 and the required functions of the oil gas springs 10 can be set and selected, and the embodiments of the present application do not make specific limitations in this regard.

[0100] The control valve assembly is a component for controlling the opening and closing of each pipeline in the hydraulic pipeline 120 to realize the opening and closing between the hydraulic pipeline 120 and the oil inlet port P, the oil return port T, and the plurality of oil outlet ports C. It can be understood that the control valve assembly includes a plurality of control valves. The number and type of control valves can be set according to the specific hydraulic pipeline 120 structure, as long as the switching of the corresponding channels can be realized to realize the required action of the oil gas spring 10, and the embodiments of the present application do not make specific limitations. The control valve assembly can be arranged in the accommodation cavity r or outside the accommodation cavity r, and the embodiments of the present application do not make specific limitations.

[0101] Taking the hydraulic system 20 of the oil gas suspension in the vehicle as an example, the hydraulic valve in the related art includes a main control valve, a vehicle control valve, a lock control valve, a wheel lifting control valve, etc., each valve realizes its function alone, and the valves are connected through pipelines. Therefore, the hydraulic system 20 is arranged dispersedly, the pipeline connection is complex, which leads to large system pressure loss, low efficiency and difficult assembly and maintenance. In the hydraulic valve assembly 100 provided by the embodiments of the present application, the valve body 110 is provided with one oil inlet port P and one oil return port T, that is, each pipeline in the hydraulic pipeline 120 is supplied with oil through one oil inlet port P and returned with oil through one oil return port T. In addition, the valve body 110 is provided with a plurality of oil outlet ports C, which can be selected and used according to actual use. Therefore, the oil inlet pipeline 121 and the oil return pipeline 122 of the hydraulic valve assembly 100 are simplified. The plurality of oil outlet ports C can also be connected to the corresponding oil outlet ports C according to the use demand.

[0102] Therefore, by integrating the hydraulic pipeline 120 in the valve body 110 and setting the corresponding oil ports on the valve body 110, the oil gas spring 10 can be connected to the corresponding position of the hydraulic pipeline 120 through the corresponding oil ports, and then the opening and closing between the hydraulic pipeline 120 and the corresponding oil ports is controlled by the control valve assembly to control the action of the corresponding oil gas spring 10. In this way, the complexity of the pipeline connection is reduced, and the problems of pressure loss, low efficiency and difficult assembly and maintenance of the hydraulic system 20 are improved.

[0103] Figure 4 The hydraulic principle structure of the hydraulic valve assembly 100 is shown Figure 1 The hydraulic principle structure of the hydraulic valve assembly 100 is shown

[0104] In some embodiments, please refer to Figure 4 , and in combination with Figures 1 to 3The hydraulic pipeline 120 includes an oil inlet pipeline 121, an oil return pipeline 122, a plurality of oil outlet pipelines 123, and a plurality of first branch pipelines 124. The inlet of the oil inlet pipeline 121 is communicated with the oil inlet port P, and the outlet of the oil inlet pipeline 121 is respectively communicated with the inlets of all the oil outlet pipelines 123, and the oil outlet pipelines 123 correspond to the oil outlet ports C one by one. Each first branch pipeline 124 is connected between an oil outlet pipeline 123 and the oil return pipeline 122, and the outlet of the oil return pipeline 122 is communicated with the oil return port T. The control valve assembly is used to open or close the oil inlet pipeline 121, the oil return pipeline 122, the oil outlet pipeline 123, and the first branch pipeline 124. Figures 1 to 4 The oil outlet ports C shown in the figure are provided with six examples, the oil outlet pipelines 123 are correspondingly provided with six, and the first branch pipelines 124 are also correspondingly provided with six, and the six oil outlet ports C are respectively oil outlet ports C. The number of oil outlet ports C, oil outlet pipelines 123, and first branch pipelines 124 can be set according to specific use, and the embodiments of the present application do not make specific limitations.

[0105] In this way, by setting one oil inlet pipeline 121 to connect a plurality of oil outlet pipelines 123, and by means of the first branch pipeline 124, the corresponding oil outlet pipeline 123 is connected with the oil return pipeline 122, that is, one oil return pipeline 122 connects a plurality of first branch pipelines 124, so that the overall hydraulic pipeline 120 is further simplified, and the number of oil outlet pipelines can be expanded according to the use needs. By means of the control assembly, the oil inlet pipeline 121, the oil return pipeline 122, the oil outlet pipeline 123, and the first branch pipeline 124 are respectively controlled, so as to control the action of the corresponding oil gas spring 10.

[0106] In some embodiments, please continue to refer to Figure 4 and in combination with Figures 1 to 3 The control valve assembly includes a plurality of first control valves, a plurality of second control valves 132, a plurality of third control valves 133, and a fourth control valve 134. Each oil outlet pipeline 123 is provided with a first control valve, and along the oil inlet direction, the first control valve is located upstream of one end of the corresponding first branch pipeline 124 connected to the oil outlet pipeline 123. The first control valve is used to open or close the corresponding oil outlet pipeline 123. Each oil outlet pipeline 123 is provided with a second control valve 132, and along the oil inlet direction, the second control valve 132 is located downstream of one end of the corresponding first branch pipeline 124 connected to the oil outlet pipeline 123. The second control valve 132 is used to open or close the corresponding oil outlet pipeline 123. Each first branch pipeline 124 is provided with a third control valve 133, and the third control valve 133 is used to open or close the corresponding first branch pipeline 124. The fourth control valve 134 is provided in the oil inlet pipeline 121 and is used to open or close the oil inlet pipeline 121. That is, a corresponding control valve is provided on each pipeline. Each pipeline can be turned on or off according to the use needs, so that each process can be independent of each other.

[0107] In some embodiments, please continue to refer to Figure 4 and in conjunction with reference Figures 1 to 3 The first control valve is configured as a bidirectional switching element; and / or, the second control valve 132 is configured as a unidirectional switching element, and the second control valve 132, when in the conducting state, allows the oil to flow in the return direction; and / or, the third control valve 133 is configured as a bidirectional switching element; and / or, the fourth control valve 134 is configured as a bidirectional switching element.

[0108] Optionally, with Figure 4 For example, the diagram illustrates a configuration where the first control valve is a bidirectional switching element, the second control valve 132 is a unidirectional switching element (allowing oil to flow in the return direction when it is in the conducting state), the third control valve 133 is a bidirectional switching element, and the fourth control valve 134 is a bidirectional switching element. Taking an oil outlet C as an example, during oil inflow, the fourth control valve 134 and the corresponding first control valve are energized, while the corresponding second control valve 132 and the corresponding third control valve 133 are de-energized. Oil flows out from the corresponding oil outlet C through the inlet pipe 121 and the corresponding outlet pipe 123. During oil return, the corresponding second control valve and the corresponding third control valve 133 are energized, while the fourth control valve 134 and the corresponding first control valve are de-energized. Oil flows into the corresponding outlet pipe 123 through the corresponding outlet C, and then into the return pipe 122 through the corresponding first branch pipe 124.

[0109] In other embodiments, the first control valve is configured as a solenoid valve; and / or, the second control valve 132 is configured as a solenoid valve; and / or, the third control valve 133 is configured as a solenoid valve; and / or, the fourth control valve 134 is configured as a solenoid valve. Optionally, with Figure 4 For example, the diagram illustrates the case where the first control valve, the second control valve 132, the third control valve 133, and the fourth control valve 134 are all solenoid valves. When all control valves are solenoid valves, compared to other hydraulic lines 120 that use proportional valves or on / off valves, the resistance and heat dissipation within the hydraulic lines 120 are reduced.

[0110] Therefore, based on the types and arrangement of the control valve components illustrated above, the internal leakage of the valve core caused by the impact of the air spring 10 during oil return can be improved. Simultaneously, during oil supply, the pressure can be reduced, improving the loss of local resistance. Furthermore, since each first branch pipeline 124 is equipped with a third control valve 133, each circuit is independent, reducing hydraulic shock to the remaining circuits. Thus, through the mutual coordination shown above, overall reliability is improved.

[0111] In some embodiments, please continue to refer to Figure 4and refer to Figures 1 to 3 The control valve assembly further comprises a plurality of fifth control valves 135. Each of the first branch circuits 124 is provided with a fifth control valve 135, and the fifth control valve 135 is located downstream of the corresponding third control valve 133 in the oil return direction. The fifth control valve 135 is configured to open or close the corresponding first branch circuit 124. Optionally, the fifth control valve 135 is configured as a one-way switch, and the fifth control valve 135 is configured to allow oil flow in the oil return direction in the open state. The fifth control valve 135 can also be an electromagnetic valve.

[0112] In this way, the hydraulic impact between circuits and other effects can be further reduced when the oil returns.

[0113] In some embodiments, please continue to refer to Figure 4 and refer to Figures 1 to 3 The hydraulic circuit 120 further comprises a sixth control valve 136 connected in parallel with the fourth control valve 134. The sixth control valve 136 is configured to open when the oil inlet pressure is greater than a preset pressure. Optionally, the sixth control valve 136 is configured as a relief valve.

[0114] In this way, when the oil is not supplied, the sixth control valve 136 can be used for low-pressure drainage to reduce system heat and improve the service life of the hydraulic valve assembly 100. At the same time, the hydraulic circuit can also be protected from overload.

[0115] In some embodiments, please continue to refer to Figure 4 and refer to Figures 1 to 3 The hydraulic circuit 120 further comprises a second branch circuit 125. The second branch circuit 125 is connected between the oil return circuit 122 and the fourth control valve 134. The fourth control valve 134 is further configured to open or close the second branch circuit 125. Optionally, the fourth control valve 134 can be a two-position three-way electromagnetic valve. In this way, when the oil returns, the oil on the oil inlet circuit 121 can flow back to the oil return circuit through the second branch circuit 125.

[0116] In some embodiments, please continue to refer to Figure 4 and refer to Figures 1 to 3 The control valve assembly further comprises a seventh control valve 137. The seventh control valve 137 is provided on the second branch circuit 125 and is configured to open or close the second branch circuit 125. Optionally, the seventh control valve 137 is configured as a one-way switch, and the seventh control valve 137 is configured to allow oil flow in the oil return direction in the open state. In this way, when the oil returns, the hydraulic impact between circuits and other effects can be further reduced.

[0117] In some of the above-mentioned embodiments, the fifth control valve 135 and the seventh control valve 137 can be configured as one-way valves or can be configured as lock-up solenoid valves. Alternatively, the fifth control valve 135 and the seventh control valve 137 can be configured as one-way valves, further reducing the complexity of the control system.

[0118] In some embodiments, referring back to Figures 1 to 4 , the hydraulic valve assembly 100 further comprises a pressure detection member 140 arranged on the oil inlet pipeline 121. In this way, the pressure condition in the hydraulic valve assembly 100 can be detected by detecting the pressure on the oil inlet pipeline 121.

[0119] In some embodiments, the hydraulic valve assembly 100 further comprises an oil inlet filter assembly L1 arranged on the oil inlet path of the oil inlet pipeline 121. Alternatively, taking Figure 4 for example, the oil inlet filter assembly L1 can be arranged on the oil inlet pipeline 121. In this way, impurities in the oil can be filtered.

[0120] In some embodiments, the hydraulic valve assembly 100 further comprises an oil return filter assembly L2 arranged on the oil return path of the oil return pipeline 122. Alternatively, taking Figure 4 for example, the oil return filter assembly L2 can be arranged outside the valve body 110. Of course, the oil return filter assembly L2 can also be arranged inside the valve body 110. The actual use can be selected, and the embodiments of the present application do not make specific limitations in this regard.

[0121] Figure 5 Fig. 1 shows a schematic diagram of the hydraulic principle structure of the hydraulic valve assembly 100 in a use state; for ease of illustration, only the content related to the embodiments of the present application is shown. Figure 1 Fig. 1 shows a schematic diagram of the hydraulic principle structure of the hydraulic valve assembly 100 in a use state; for ease of illustration, only the content related to the embodiments of the present application is shown.

[0122] In some embodiments, referring back to Figures 1 to 4 , the plurality of oil gas springs 10 are arranged. One of the plurality of oil outlet ports C is used to respectively communicate the rodless chambers of the plurality of oil gas springs 10, another of the plurality of oil outlet ports C is used to respectively communicate the rod chambers of the plurality of oil gas springs 10, and the remaining oil outlet ports C correspond to the plurality of oil gas springs 10 one by one. Taking Figure 5 for example, a case where six oil gas springs 10 are arranged is shown.

[0123] In some embodiments, the hydraulic valve assembly 100 has a first state; in the first state, the control valve assembly can controllably connect the hydraulic line 120 to the oil inlet P and controllably connect the hydraulic line 120 to at least one of the rest of the oil outlets C to enable the corresponding oil-air spring 10 to extend; and / or, the hydraulic valve assembly 100 has a second state; in the second state, the control valve assembly can controllably connect the hydraulic line 120 to the oil return T and controllably connect the hydraulic line 120 to at least one of the rest of the oil outlets C to enable the corresponding oil-air spring 10 to contract; and / or, the hydraulic valve assembly 100 has a third state; in the third state, the control valve assembly can controllably connect the hydraulic line 120 to the oil inlet P and controllably connect the hydraulic line 120 to one of the oil outlets C to enable all the oil-air springs 10 to be locked; and / or, the hydraulic valve assembly 100 has a fourth state; in the fourth state, the control valve assembly can controllably connect the hydraulic line 120 to the oil return T and controllably connect the hydraulic line 120 to one of the oil outlets C to enable all the oil-air springs 10 to be unlocked; and / or, the hydraulic valve assembly 100 has a fifth state; in the fifth state, the control valve assembly can controllably connect the hydraulic line 120 to the oil inlet P and controllably connect the hydraulic line 120 to another one of the oil outlets C to enable all the oil-air springs 10 to be lifted; and / or, the hydraulic valve assembly 100 has a sixth state; in the sixth state, the control valve assembly can controllably connect the hydraulic line 120 to the oil return T and controllably connect the hydraulic line 120 to another one of the oil outlets C to enable all the oil-air springs 10 to be lifted.

[0124] In the following, for the purpose of illustration, the oil-air spring 10 is applied to an oil-air suspension system of a vehicle. Figure 5 It can be understood that the oil-air spring 10 in the embodiments of the present application includes but is not limited to being applied to an oil-air suspension system, and can also be applied to other walking mechanical systems, and the embodiments of the present application do not specifically limit this.

[0125] Please refer to Figure 5, the oil and gas spring 10 includes a left front spring 11, a right front spring 12, two left rear springs 13 and two right rear springs 14. The valve body 110 is provided with an oil outlet A1, an oil outlet A2, an oil outlet B1, an oil outlet B2, an oil outlet K1 and an oil outlet K2. Correspondingly, the oil outlet A1 is communicated with the oil outlet A1, and the first branch pipeline 124a is connected between the oil outlet A1 and the oil return pipeline 122. The first control valve 131a and the second control valve 132a are arranged on the oil outlet A1, and along the oil inlet direction, the first control valve 131a is located upstream of the first branch pipeline 124a connected to one end of the oil outlet A1, and the second control valve 132a is located downstream of the first branch pipeline 124a connected to one end of the oil outlet A1. The third control valve 133a and the fifth control valve 135a are arranged on the first branch pipeline 124a, and along the oil return direction, the fifth control valve 135a is located downstream of the third control valve 133a. Similarly, the oil outlet A2 is communicated with the oil outlet A2, the oil outlet B1 is communicated with the oil outlet B1, the oil outlet B2 is communicated with the oil outlet B2, the oil outlet K1 is communicated with the oil outlet K1, and the oil outlet K2 is communicated with the oil outlet K2. The arrangement and connection relationship of the corresponding first branch pipeline 124b, first branch pipeline 124c, first branch pipeline 124d, first branch pipeline 124e, first branch pipeline 124f, first control valve 131b, first control valve 131c, first control valve 131d, first control valve 131e, first control valve 131f, second control valve 132b, second control valve 132c, second control valve 132d, second control valve 132e, second control valve 132f, third control valve 133a, third control valve 133b, third control valve 133c, third control valve 133d, third control valve 133e, third control valve 133f, fifth control valve 135b, fifth control valve 135c, fifth control valve 135d, fifth control valve 135e, fifth control valve 135f will not be repeated here. Figure 5 In the middle, the fifth control valve 135a, the fifth control valve 135b, the fifth control valve 135c, the fifth control valve 135d, the fifth control valve 135e and the fifth control valve 135f are all one-way valves.

[0126] Among them, the oil outlet K2 is used to communicate the rodless cavity of the left front spring 11, the right front spring 12, the left rear spring 13 and the right rear spring 14 respectively, the oil outlet K1 is used to communicate the rod cavity of the left front spring 11, the right front spring 12, the left rear spring 13 and the right rear spring 14 respectively, the oil outlet B2 is used to communicate the rodless cavity of the right rear spring 14, the oil outlet A2 is used to communicate the rodless cavity of the right front spring 12, the oil outlet A1 is used to communicate the rodless cavity of the left front spring 11, and the oil outlet B1 is used to communicate the rodless cavity of the left rear spring 13.

[0127] Please continue to refer toFigure 5 Taking the left front spring 11 as an example, in the first state, the fourth control valve 134 and the first control valve 131a are energized, and the oil enters the inlet port P, the inlet pipeline 121, the outlet pipeline 123a, the outlet port A1, and the rodless chamber of the left front spring 11 in sequence, and the left front spring 11 is elongated. In the second state, the second control valve 132a and the third control valve 133a are energized, and the oil flows from the rodless chamber of the left front spring 11 to the oil return port T via the outlet port A1, the outlet pipeline 123a, the first branch pipeline 124a, the oil return pipeline 122, and the oil return port T under the gravity of the vehicle in sequence. In the third state, the fourth control valve 134 and the first control valve 131e are energized, and the oil enters the inlet port P, the inlet pipeline 121, the outlet pipeline 123e, and the outlet port K1 in sequence, and flows into the rod chambers of the left front spring 11, the right front spring 12, the left rear spring 13, and the right rear spring 14, and the left front spring 11, the right front spring 12, the left rear spring 13, and the right rear spring 14 are locked. In the fourth state, the second control valve 132e and the third control valve 133e are energized, and the oil flows from all the rod chambers to the oil return port T via the outlet port K1, the outlet pipeline 123e, the first branch pipeline 124e, the oil return pipeline 122, and the oil return port T under the pressure in the corresponding springs in sequence, and the left front spring 11, the right front spring 12, the left rear spring 13, and the right rear spring 14 are unlocked. In the fifth state, the fourth control valve 134 and the first control valve 131f are energized, and the oil enters the inlet port P, the inlet pipeline 121, the outlet pipeline 123a, and the outlet port K2 in sequence, and flows into the rodless chambers of the left front spring 11, the right front spring 12, the left rear spring 13, and the right rear spring 14, and finally the wheels are lifted. In the sixth state, the second control valve 132f and the third control valve 133f are energized, and the oil flows from all the rodless chambers to the oil return port T via the outlet port K2, the outlet pipeline 123f, the first branch pipeline 124f, the oil return pipeline 122, and the oil return port T under the gravity of the wheels, and finally the lifting of the wheels is released.

[0128] In this way, by controlling the corresponding valve, the hydraulic circuit and the corresponding valve cooperate to enable the hydraulic valve assembly 100 to have the required state, thereby realizing the corresponding function. Through the pipeline arrangement of the hydraulic circuit, the pressure loss is minimized, the efficiency is improved, and the pipeline rupture problem is improved under the condition of meeting the machining process.

[0129] In some embodiments, please refer to Figures 1 to 3 All the outlet ports C are arranged on the same side of the valve body 110. In this way, the installation of the hydraulic valve assembly 100 and the corresponding oil gas spring 10 can be further facilitated.

[0130] In some embodiments, please refer to Figures 1 to 3The control valve assembly is mounted on the outside of the valve body 110, and its mounting end extends into the receiving cavity r to connect to the hydraulic line 120. This facilitates the installation and maintenance of the control valve assembly. Not only can relevant valve components be replaced according to usage requirements, but functional expansion is also possible.

[0131] Based on the same inventive concept, this application also provides a hydraulic system 20, which includes the hydraulic valve assembly 100 in any of the above embodiments. Since the hydraulic system 20 includes the hydraulic valve assembly 100 in any of the above embodiments, the hydraulic system 20 also possesses the advantages of the hydraulic valve assembly 100, which will not be elaborated further here.

[0132] Figure 6 A schematic diagram of the hydraulic system 20 in one embodiment of this application is shown; Figure 7 It shows Figure 6 This is a schematic diagram illustrating the hydraulic principle structure of the hydraulic system 20 in one operating state. For ease of explanation, only the content relevant to the embodiments of this application is shown.

[0133] In some embodiments, please refer to Figure 6 and Figure 7 The hydraulic system 20 also includes a support assembly 200, a tank assembly 300, and a drive assembly 400. The support assembly 200 is used to connect a target component, such as a vehicle frame 30. The tank assembly 300 is mounted on the support assembly 200 and stores hydraulic fluid. The drive assembly 400 is mounted on the tank assembly 300 and provides the driving force to deliver the hydraulic fluid from the tank assembly 300 to the hydraulic valve assembly 100. The return port T connects to the tank assembly 300.

[0134] In this way, by modularizing the functional components within the hydraulic system 20, the connections between modules are convenient, and the number of pipelines is reduced. This not only facilitates disassembly and assembly but also allows for replacement and expansion according to functional requirements.

[0135] Figure 8 It shows Figure 6 The schematic diagram shows the structure of the oil tank assembly 300 in the hydraulic system 20; for ease of explanation, only the content related to the embodiments of this application is shown.

[0136] In some embodiments, please refer to Figure 6 and combined Figure 7 and Figure 8The oil tank assembly 300 comprises a tank body 310 and a breather valve assembly 320. The tank body 310 has a storage cavity for storing oil, and an oil outlet 311 and an oil inlet 312 respectively communicating with the storage cavity. The oil outlet 311 communicates with an input port of the drive assembly 400, and the oil inlet 312 is used for inputting oil. The breather valve assembly 320 is arranged outside the tank body 310 and is used for balancing the pressure in the tank body 310.

[0137] In this way, by integrating the oil tank assembly 300, the drive assembly 400 can be used to carry.

[0138] In some embodiments, please continue to refer to Figure 6 , and combine Figure 7 and Figure 8 The oil inlet 312 is arranged on the side wall of the tank body 310. In this way, the oil inlet pipeline of the oil tank assembly 300 can be arranged in a beveling manner, which can facilitate the input of oil into the oil tank assembly 300 in a compact space arrangement.

[0139] In some embodiments, please continue to refer to Figure 6 , and combine Figure 7 and Figure 8 The oil tank assembly 300 further comprises an oil return filter assembly L2 arranged in the tank body 310. An input port of the oil return filter assembly L2 communicates with the oil return port T, and an output port of the oil return filter assembly L2 communicates with the storage cavity. In this way, the position of the oil return filter assembly L2 can be flexibly arranged to filter the returned oil.

[0140] In some embodiments, please continue to refer to Figure 6 , and combine Figure 7 and Figure 8 The oil tank assembly 300 further comprises a liquid level indicator 330 arranged in the tank body 310. In this way, the liquid level displayed by the liquid level indicator 330 can be used to input oil into the tank body 310.

[0141] In some embodiments, please continue to refer to Figure 6 and Figure 8 The drive assembly 400 comprises a motor assembly 410 and an oil pump assembly 420 connected to the motor assembly 410. An input port of the oil pump assembly 420 communicates with the oil tank assembly 300, an output port of the oil pump assembly 420 communicates with the oil inlet port P, and the motor assembly 410 is used to provide power for the operation of the oil pump assembly 420. In some specific embodiments, the diameter of the pipeline connecting the oil pump assembly 420 and the oil tank assembly 300 can be relatively large, so that the oil can smoothly enter the oil pump assembly 420. The diameter of the pipeline connecting the oil pump assembly 420 and the oil inlet port P can be relatively small, so that the oil output pressure can be larger, so as to respond more quickly to the action of the required oil gas spring 10.

[0142] In some embodiments, the oil pump assembly 420 can be configured as an external gear pump. In this way, the oil pump assembly 420 has a smaller volume and a strong self-suction capability.

[0143] In some embodiments, please continue to refer to Figure 6 Figure 8 Figure 6 The bracket assembly 200 can be assembled by welding channel steel structural members, so that the bracket assembly 200 has a light weight and a strong carrying capacity. Machined holes are arranged on the carrying surface of the bracket assembly 200, so that the hydraulic valve assembly 100, the oil tank assembly 300 and other hydraulic elements can be connected, and the assembly is flexible.

[0144] In the hydraulic system 20 provided in the embodiments of the present application, for example, first, the bracket assembly 200 can be fixed on the vehicle frame 30 or the load-bearing vehicle body by fasteners; second, the integrated oil tank assembly 300, the driving assembly 400 (the motor assembly 410 and the oil pump assembly 420) and the hydraulic valve assembly 100 are assembled on the bracket assembly 200 and are sequentially fastened by fasteners; third, the corresponding pipelines are connected between the oil pump assembly 420 and the hydraulic valve assembly 100; and finally, the various functional oil ports on the hydraulic valve assembly 100 are connected to the corresponding functional oil ports of the oil gas spring 10 according to the functional requirements.

[0145] Based on the same inventive concept, the embodiments of the present application also provide a vehicle comprising the hydraulic system 20 in any of the above embodiments. Since the hydraulic system 20 comprises the hydraulic valve assembly 100 in any of the above embodiments, the hydraulic system 20 also has the advantages of the hydraulic valve assembly 100, which will not be described in detail here.

[0146] In summary, the hydraulic valve assembly 100, the hydraulic system 20 and the vehicle provided in the embodiments of the present application can be loaded according to the use requirements of the vehicle, the hydraulic valve assembly 100 is connected to the oil gas spring 10 or other execution elements, the required functions of the vehicle can be realized, and meanwhile, the elements are optimized to reduce the weight, the cost and to improve the performance. Specifically, (1) the various hydraulic elements in the hydraulic system 20 can be connected compactly, so that the hydraulic auxiliary components such as pipelines and connectors are effectively reduced; (2) compared with the numerous and dispersed valve pieces in the related art, by reasonably arranging the positions of the oil channels, the oil ports and the valve pieces in the valve body 110, the valve body 110 is minimized in size under the premise that the valve body 110 is not broken by hydraulic pressure between the pipelines, and the heat dissipation requirement can be met; (3) in the hydraulic valve assembly 100, by reasonably arranging the positions of the valve pieces, increasing the shared oil channels and reducing the number of oil channels, the weight of the hydraulic valve assembly 100 and the complexity of the pipelines are reduced. Thus, the components cooperate with each other, the complexity of the pipeline connection is reduced, and the problems of pressure loss, low efficiency and difficult assembly and maintenance of the hydraulic system 20 are improved.

[0147] Any combination of the technical features in the above embodiments can be made, and for the sake of brevity, not all possible combinations are described above, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0148] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A hydraulic system, characterized in that, Includes a hydraulic valve assembly and multiple oil-pneumatic springs; the hydraulic valve assembly includes: The valve body has a receiving cavity and an oil inlet, an oil return port, and multiple oil outlets respectively connected to the receiving cavity. The oil outlets are used to output oil to or input oil into the hydraulic spring. One of the oil outlets is used to connect to the rodless cavity of all the hydraulic springs, another oil outlet is used to connect to the rod cavity of all the hydraulic springs, and the remaining oil outlets correspond one-to-one with all the hydraulic springs, with the remaining oil outlets being used to connect to the rodless cavity of the corresponding hydraulic spring. Hydraulic pipelines are disposed within the receiving cavity; the hydraulic pipelines include an inlet pipeline, a return pipeline, multiple outlet pipelines, and multiple first branch pipelines; the inlet of the inlet pipeline is connected to the inlet port, and the outlet of the inlet pipeline is connected to the inlet of all the outlet pipelines respectively, with each outlet pipeline corresponding to an outlet port; each first branch pipeline is connected between an outlet pipeline and a return pipeline, and the outlet of the return pipeline is connected to the return port; and A control valve assembly, connected to the hydraulic pipeline, is used to control the connection and disconnection between the hydraulic pipeline and the oil inlet, the oil return port, and the plurality of oil outlets, thereby controlling the operation of the hydraulic spring. The control valve assembly includes a plurality of first control valves, a plurality of second control valves, a plurality of third control valves, and a fourth control valve. Each oil outlet pipeline is provided with a first control valve, located upstream of the end of the corresponding first branch pipeline connected to the oil outlet pipeline along the oil inlet direction. The first control valve is used to open or close the corresponding oil outlet pipeline. Each oil outlet pipeline is provided with a second control valve, located downstream of the end of the corresponding first branch pipeline connected to the oil outlet pipeline along the oil inlet direction. The second control valve is used to open or close the corresponding oil outlet pipeline. Each first branch pipeline is provided with a third control valve, which is used to open or close the corresponding first branch pipeline. The fourth control valve is located on the oil inlet pipeline and is used to open or close the oil inlet pipeline.

2. The hydraulic system according to claim 1, characterized in that, The first control valve is configured as a bidirectional switching element; and / or The second control valve is configured as a one-way switching element, which, when in the open state, allows oil to flow in the return direction; and / or The third control valve is configured as a bidirectional switching element; and / or The fourth control valve is configured as a bidirectional switching element.

3. The hydraulic system according to claim 1, characterized in that, The first control valve is configured as a solenoid valve; and / or The second control valve is configured as a solenoid valve; and / or The third control valve is configured as a solenoid valve; and / or The fourth control valve is configured as a solenoid valve.

4. The hydraulic system according to claim 1, characterized in that, The control valve assembly also includes a plurality of fifth control valves; Each of the first branch pipelines is provided with a fifth control valve, and along the oil return direction, the fifth control valve is located downstream of the corresponding third control valve; The fifth control valve is used to open or close the corresponding first branch pipeline.

5. The hydraulic system according to claim 4, characterized in that, The fifth control valve is configured as a one-way switching element, and when the fifth control valve is in the open state, it allows the oil to flow in the return direction.

6. The hydraulic system according to claim 1, characterized in that, The hydraulic pipeline also includes a sixth control valve connected in parallel with the fourth control valve; The sixth control valve is used to open when the pressure of the inlet oil is greater than the preset pressure.

7. The hydraulic system according to claim 6, characterized in that, The sixth control valve is configured as an overflow valve.

8. The hydraulic system according to claim 1, characterized in that, The hydraulic pipeline also includes a second branch pipeline; The second branch line is connected between the return oil line and the fourth control valve; The fourth control valve is also used to open or close the second branch pipeline.

9. The hydraulic system according to claim 8, characterized in that, The control valve assembly also includes a seventh control valve; The seventh control valve is located on the second branch pipeline and is used to open or close the second branch pipeline.

10. The hydraulic system according to claim 9, characterized in that, The seventh control valve is configured as a one-way switching element, and when the seventh control valve is in the conducting state, it allows the oil to flow in the return direction.

11. The hydraulic system according to any one of claims 1-10, characterized in that, The hydraulic valve assembly further includes a pressure sensing element, which is disposed on the oil inlet line; and / or The hydraulic valve assembly further includes an inlet filter assembly, which is located on the inlet path of the inlet pipeline; and / or The hydraulic valve assembly also includes a return oil filter assembly, which is located on the return oil path of the return oil pipeline.

12. The hydraulic system according to any one of claims 1-10, characterized in that, All of the oil outlets are located on the same side of the valve body; and / or The control valve assembly is mounted on the outside of the valve body, and the mounting end of the control valve assembly extends into the receiving cavity to connect with the hydraulic pipeline.

13. The hydraulic system according to any one of claims 1-10, characterized in that, The hydraulic system also includes: The bracket assembly is used to connect the target component; The fuel tank assembly, mounted on the bracket assembly, is used to store fuel; and A drive assembly is mounted on the oil tank assembly; the drive assembly is used to provide driving force to transport oil in the oil tank assembly to the hydraulic valve assembly; The oil return port is connected to the oil tank assembly.

14. The hydraulic system according to claim 13, characterized in that, The fuel tank assembly includes: The housing has a storage cavity for storing oil, and an outlet and an inlet respectively connected to the storage cavity; the outlet is connected to the input port of the drive assembly, and the inlet is used to input oil; and A vent valve assembly is located on the outside of the housing and is used to balance the pressure inside the housing.

15. The hydraulic system according to claim 14, characterized in that, The liquid inlet is located on the side wall of the housing; and / or The oil tank assembly further includes a return oil filter assembly disposed on the tank body; the inlet of the return oil filter assembly is connected to the return oil port, and the outlet of the return oil filter assembly is connected to the storage cavity; and / or The oil tank assembly also includes a liquid level indicator located on the tank body.

16. The hydraulic system according to claim 13, characterized in that, The drive assembly includes a motor assembly and an oil pump assembly connected to the motor assembly; The input port of the oil pump assembly is connected to the oil tank assembly, the output port of the oil pump assembly is connected to the oil inlet, and the motor assembly is used to provide power for the operation of the oil pump assembly.

17. A vehicle, characterized in that, Includes the hydraulic system as described in any one of claims 1-16.

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