Hydraulic cylinder, hydraulic system and vehicle

Abstract

The invention relates to a hydraulic cylinder, a hydraulic system and a vehicle, the hydraulic cylinder comprises a cylinder barrel, a piston and a piston rod connected to the piston, the cylinder barrel comprises an annular body and a working cavity defined by the annular body, the piston is movably arranged in the working cavity, and the annular body is provided with a working oil channel and a working oil port connected with an external oil way; the hydraulic cylinder further comprises a reversing device which is arranged in the annular body and used for switching the flow direction of a medium in the working oil channel so as to change the working state of the piston rod, and therefore control over steering and the like of a vehicle is achieved. Namely, the hydraulic cylinder provided by the invention can be reversed through the hydraulic cylinder, and a reversing valve does not need to be additionally arranged, so that the structure of a hydraulic system is simplified. The use of pipelines and hydraulic elements in the hydraulic system is reduced, and the pipeline connection in the hydraulic system is simpler.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydraulic systems, and in particular, to a hydraulic cylinder, a hydraulic system and a vehicle. Background Art

[0002] In a hydraulic system, a reversing valve is usually required between the hydraulic cylinder and the hydraulic source to achieve the reversal of the movement of the hydraulic cylinder piston rod, but this will increase the number of pipelines and hydraulic components in the hydraulic system, and the pipeline connection of the hydraulic system will also be more complicated. Summary of the invention

[0003] The purpose of the present disclosure is to provide a hydraulic cylinder, a hydraulic system and a vehicle, wherein the hydraulic cylinder can be switched by itself without providing an additional switching valve.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a hydraulic cylinder in a first aspect, comprising a cylinder barrel, a piston and a piston rod connected to the piston, wherein the cylinder barrel comprises an annular body and a working chamber surrounded by the annular body, the piston is movably arranged in the working chamber, the annular body is provided with a working oil passage and a working oil port connected to an external oil circuit, the working chamber is communicated with the working oil port through the working oil passage, and the hydraulic cylinder further comprises:

[0005] A reversing device is arranged in the annular body and is used to switch the flow direction of the medium in the working oil channel to change the working state of the piston rod.

[0006] Optionally, the annular body includes an outer cylinder body and an inner cylinder body spaced apart inside the outer cylinder body, the working oil port is arranged on the cylinder wall of the outer cylinder body, an annular accommodating cavity is formed between the outer cylinder body and the inner cylinder body, the working cavity is formed in the inner cylinder body, the working oil channel is formed on the cylinder wall of the inner cylinder body, the working chamber is connected with the working oil port through the working oil channel, the reversing device includes a switching member movably arranged in the annular accommodating cavity, a switching flow channel is formed on the switching member, and the switching flow channel can change the flow direction of the medium in the working oil channel by controlling the movement of the switching member.

[0007] Optionally, there are multiple working oil channels and each of the working oil channels has at least one external oil channel port, and the multiple external oil channel ports are arranged along the axial direction of the cylinder barrel. The switching member is constructed as a sliding member that can slide along the axial direction of the cylinder barrel, so that the switching flow channel can open and close different external oil channel ports by controlling the sliding of the sliding member.

[0008] Optionally, the switching flow channel communicates with the outer surface and the inner surface of the sliding member, the switching flow channel has a plurality of switching outer oil ports located on the outer surface of the sliding member, the plurality of switching outer oil ports are arranged along the axial direction of the cylinder barrel, and are used to selectively communicate with different working oil ports, the switching flow channel also has a switching inner oil port located on the inner surface of the sliding member, the switching inner oil port is communicated with each of the switching outer oil ports, and is used to communicate with the outer oil port of the oil channel,

[0009] The sliding member is constructed as an arc-shaped block, which has an arc-shaped inner surface that fits with the outer surface of the inner cylinder body, and an arc-shaped outer surface that fits with the inner surface of the outer cylinder body.

[0010] Optionally, the working chamber includes a first hydraulic chamber and a second hydraulic chamber located on both sides of the piston, the working oil port includes an oil inlet and an oil return port, the working oil channel includes a first working oil channel and a second working oil channel, the first working oil channel is connected to the first hydraulic chamber, and the second working oil channel is connected to the second hydraulic chamber, and the reversing device can selectively connect the oil inlet to one of the first working oil channel and the second working oil channel, and the oil return port is connected to the other.

[0011] Optionally, the working oil passage further includes a third working oil passage, and the third working oil passage is used to connect the oil inlet and the oil return port, and the reversing device can also connect the oil inlet and the oil return port with the third working oil passage.

[0012] Optionally, the first working oil passage and the second working oil passage respectively have an outer oil passage opening located on the outer wall of the inner cylinder body and an inner oil passage opening located on the inner wall of the inner cylinder body, and the third working oil passage has two outer oil passage openings located on the outer wall of the inner cylinder body.

[0013] The first working oil channel or the second working oil channel is constructed as a first oil channel structure in which the outer oil port of the oil channel and the inner oil port of the oil channel correspond to the hydraulic chamber on the same side, or is constructed as a second oil channel structure in which the outer oil port of the oil channel and the inner oil port of the oil channel correspond to different hydraulic chambers, and the third working oil channel is constructed as a third oil channel structure in which the two outer oil ports of the oil channel correspond to different hydraulic chambers.

[0014] Optionally, the first oil channel structure includes a first straight segment, the first straight segment extends along the radial direction of the inner cylinder body, the outer oil port of the oil channel and the inner oil port of the oil channel are located at two ends of the first straight segment, the second oil channel structure includes a first arc segment and a second straight segment, the first arc segment extends along the circumferential direction of the inner cylinder body, the second straight segment extends along the axial direction of the inner cylinder body, the outer oil port of the oil channel is located at one end of the first arc segment, and the inner oil port of the oil channel is located at one end of the second straight segment, the third oil channel structure includes a third straight segment and two second arc segments, the third straight segment extends along the axial direction of the inner cylinder body, the two second arc segments both extend along the circumferential direction of the inner cylinder body, and the two outer oil ports of the oil channel are respectively located at one end of the two second arc segments,

[0015] The third straight line segment and the second straight line segment are respectively located on two sides of the inner cylinder body.

[0016] Optionally, there are two first working oil channels and two second working oil channels respectively, the inner oil ports of the two first working oil channels are connected to the first hydraulic chamber, and the outer oil ports of the oil channels correspond to the first hydraulic chamber and the second hydraulic chamber respectively, and the inner oil ports of the two second working oil channels are connected to the second hydraulic chamber, and the outer oil ports of the oil channels correspond to the second hydraulic chamber and the first hydraulic chamber respectively.

[0017] Optionally, the commutation device is an electromagnetic commutation device.

[0018] Optionally, the reversing device comprises an electromagnetic coil accommodated in the annular accommodating cavity, the switching member is made of a magnetic material, and the electromagnetic coil is used to drive the switching member to reciprocate in the annular accommodating cavity.

[0019] Optionally, the hydraulic cylinder is a bidirectional hydraulic cylinder, and the piston rod comprises a first piston rod and a second piston rod connected to two sides of the piston.

[0020] Optionally, the hydraulic cylinder is a steering hydraulic cylinder used in vehicles.

[0021] A second aspect of the present disclosure provides a hydraulic system for a vehicle, comprising:

[0022] Hydraulic pump, and

[0023] The steering hydraulic cylinder is the hydraulic cylinder provided in the first aspect of the present disclosure, which is connected to the hydraulic pump and is used to drive the wheels of the vehicle to rotate.

[0024] Optionally, the steering hydraulic cylinder is a bidirectional hydraulic cylinder and includes a first hydraulic cylinder and a second hydraulic cylinder, the first hydraulic cylinder is used to drive the two front wheels of the vehicle, and the second hydraulic cylinder is used to drive the two rear wheels of the vehicle.

[0025] Optionally, the hydraulic pump is constructed as a bidirectional hydraulic pump, and the two working oil ports of the bidirectional hydraulic pump are connected to the working oil ports of the hydraulic cylinder through a first main oil circuit and a second main oil circuit respectively, and the first main oil circuit and the second main oil circuit are both connected to accumulators.

[0026] Optionally, the hydraulic system further includes a hydraulic brake circuit and a hydraulic suspension circuit, and the hydraulic brake circuit and the hydraulic suspension circuit are respectively connected in parallel to the first main oil circuit and the second main oil circuit.

[0027] A third aspect of the present disclosure provides a vehicle, comprising the hydraulic cylinder provided in the first aspect of the present disclosure and / or the hydraulic system provided in the second aspect of the present disclosure.

[0028] Through the above technical solution, the present disclosure utilizes the cylinder barrel structure of the hydraulic cylinder to integrate a reversing device, and by controlling the reversing device, the medium flow direction of the working oil channel can be switched to change the working state such as the extension direction of the piston rod, thereby realizing the control of the vehicle's steering, etc. That is, the hydraulic cylinder provided by the present disclosure can be reversed by itself without the need to additionally set up a reversing valve, so that the structure of the hydraulic system is simplified. The use of pipelines and hydraulic components in the hydraulic system is reduced, and the pipeline connection in the hydraulic system is made simpler.

[0029] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0031] Figure 1 is a schematic structural diagram of a hydraulic cylinder provided in an exemplary embodiment of the present disclosure;

[0032] Figure 2 is a schematic structural diagram of a hydraulic cylinder in a first working mode provided in an exemplary embodiment of the present disclosure; wherein the arrow direction in the figure indicates the flow path of the pressure medium;

[0033] Figure 3 is a schematic structural diagram of a hydraulic cylinder in a second working mode provided in an exemplary embodiment of the present disclosure; wherein the arrow direction in the figure indicates the flow path of the pressure medium;

[0034] Figure 4 is a structural schematic diagram of a hydraulic cylinder in a third working mode provided in an exemplary embodiment of the present disclosure; wherein the arrow direction in the figure indicates the flow path of the pressure medium;

[0035] Figure 5 is a schematic structural diagram of an inner cylinder body and a switching member in a hydraulic cylinder provided in an exemplary embodiment of the present disclosure;

[0036] Figure 6 is a simplified structural diagram of a switching member in a hydraulic cylinder provided in an exemplary embodiment of the present disclosure;

[0037] Figure 7 is a schematic diagram of the structure of the inner cylinder body in the hydraulic cylinder provided in an exemplary embodiment of the present disclosure;

[0038] Figure 8 is a schematic diagram of a part of the inner cylinder body structure of a hydraulic cylinder provided in an exemplary embodiment of the present disclosure;

[0039] Fig. 9 is a schematic diagram of a hydraulic system of a vehicle provided in an exemplary embodiment of the present disclosure;

[0040] Fig.10 1 is a pressure medium flow path diagram of a hydraulic brake circuit of a vehicle provided in an exemplary embodiment of the present disclosure when pressure is built up, wherein the diagram includes a second steering hydraulic cylinder and a hydraulic brake circuit and a hydraulic suspension circuit corresponding to a single wheel, and the flow paths of the pressure medium of the hydraulic suspension circuit and the second steering hydraulic cylinder are not shown;

[0041] Fig.11 1 is a flow path diagram of a pressure medium of a hydraulic brake circuit of a vehicle provided in an exemplary embodiment of the present disclosure when the brake is released, wherein the diagram includes a second steering hydraulic cylinder and a hydraulic brake circuit and a hydraulic suspension circuit corresponding to a single wheel, and the flow paths of the pressure medium of the hydraulic suspension circuit and the second steering hydraulic cylinder are not shown;

[0042] Fig.12 is a pressure medium flow path diagram when the suspension shock absorber of the vehicle provided in an exemplary embodiment of the present disclosure is in a lifting state, wherein the diagram includes a second steering hydraulic cylinder and a hydraulic brake circuit and a hydraulic suspension circuit corresponding to a single wheel, and the flow paths of the pressure medium of the hydraulic brake circuit and the second steering hydraulic cylinder are not shown;

[0043] Fig.13 is a pressure medium flow path diagram when the suspension shock absorber of the vehicle provided in an exemplary embodiment of the present disclosure is in a falling state, wherein the diagram includes a second steering hydraulic cylinder and a hydraulic brake circuit and a hydraulic suspension circuit corresponding to a single wheel, and the flow paths of the pressure medium of the hydraulic brake circuit and the second steering hydraulic cylinder are not shown;

[0044] Fig.14It is a pressure medium flow path diagram of the suspension shock absorber of the vehicle provided in an exemplary embodiment of the present disclosure when the suspension shock absorber is in a steady state and the suspension shock absorber is compressed, wherein the diagram includes a second steering hydraulic cylinder and a hydraulic brake circuit and a hydraulic suspension circuit corresponding to a single wheel, and the flow path of the pressure medium of the hydraulic brake circuit and the second steering hydraulic cylinder is not shown.

[0045] Description of Reference Numerals

[0046] 10-hydraulic pump; 100-bidirectional hydraulic pump; 20-hydraulic cylinder; 200-steering hydraulic cylinder; 20a-first hydraulic cylinder; 20b-second hydraulic cylinder; 201-cylinder barrel; 21-annular body; 211-outer cylinder body; 212-inner cylinder body; 22-annular accommodating chamber; 23-working chamber; 231-first chamber; 2310-first hydraulic chamber; 232-second chamber; 2320-second hydraulic chamber; 24-piston; 25-piston rod; 251-first piston rod; 252-second piston rod; 26-reversing device; 261-electromagnetic coil; 262-switching member; 2620-sliding member; 27-working oil port; 271-oil inlet; 272-oil return port; 28-switching flow channel; 281-switching external oil port; 282-switching internal oil port; 29-working oil channel; 29a-oil channel outer oil port; 29b-oil channel inner oil port; 29c-first straight section; 29d-first arc section; 29e-second straight section; 29f-third straight section; 29h-second arc section; 291-first working oil channel; 292-second working oil channel; 293-third working oil channel; 30-hydraulic brake circuit; 31-switching valve; 32-pressure-maintaining valve; 33-brake mechanism; 34-pressure reducing valve; 35-first one-way valve; 36-second one-way valve; 37-brake oil inlet; 38-brake oil return; 40-hydraulic suspension circuit; 41-first reversing valve; 42-first one-way throttle valve; 43-suspension shock absorber; 431-first rodless chamber; 432-first rod chamber; 50-accumulator; 60-first main oil circuit; 70-second main oil circuit; 80-steering rod. DETAILED DESCRIPTION

[0047] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0048] The inventors have found that although the switching of the hydraulic cylinder can be achieved by setting a two-way pump through the oil supply direction of the two-way pump in some scenarios, in many scenarios the two-way pump is not dedicated to controlling the hydraulic cylinder, and there are other hydraulic actuators that need to be controlled. For example, the hydraulic system provided by the present invention described later in this article not only provides working medium for the steering hydraulic cylinder, but also provides working medium for systems such as braking and suspension. At this time, the two-way pump cannot be relied upon alone to control the reversing of the steering cylinder. Therefore, it is particularly important that the hydraulic cylinder itself can be able to reverse.

[0049] The first aspect of the present disclosure provides a hydraulic cylinder 20, such as Figures 1 to 8 As shown, it includes a cylinder 201, a piston 24, and a piston rod 25 connected to the piston 24. The cylinder 201 includes an annular body 21 and a working chamber 23 surrounded by the annular body. The piston 24 is movably arranged in the working chamber 23. The piston 24 divides the working chamber 23 into a first chamber 231 and a second chamber 232. In this way, by changing the oil supply or oil return state of the chamber serving as the hydraulic chamber, it is possible to control whether the piston 24 moves or the moving direction, thereby controlling the working state of the piston rod 25. The working state of the piston rod 25 described herein includes whether to extend or retract and different directions of extension or retraction.

[0050] The hydraulic cylinder 20 provided by the present disclosure further includes a reversing device 26, which is arranged in the annular body 21, and the annular body 21 is provided with a working oil passage 29 and a working oil port 27 connected to an external oil circuit. The hydraulic chamber in the working chamber 23 is connected to the working oil port 27 through the working oil passage 29, that is, the pressure medium of the hydraulic chamber comes from the working oil passage 29. In this way, the pressure medium in the external oil circuit, such as hydraulic oil, can enter the first chamber 231 or the second chamber 232 as the hydraulic chamber through the working oil passage 29 after entering the working oil port 27, so as to push the piston 24 in the working chamber 23 to move in the working chamber 23, thereby driving the piston rod 25 to move. The reversing device 26 can be used to switch the flow direction of the medium in the working oil passage 29, for example, the working oil passage 29 that transports the pressure medium to the working chamber 23 can be converted into the working oil passage 29 that outputs the pressure medium in the working chamber 23, so as to change the working state of the piston rod 25, so as to at least change the moving direction of the piston 24 in the working chamber 23. When the hydraulic cylinder 20 is arranged in a hydraulic system, the hydraulic cylinder 20 can perform reversal by itself without being connected to a reversing valve, thereby reducing the use of pipelines and hydraulic components in the hydraulic system and making the pipeline connection in the hydraulic system simpler.

[0051] It should be noted that, in one embodiment of the present disclosure, the hydraulic cylinder 20 can be constructed as a hydraulic cylinder 20 in which both the first chamber 231 and the second chamber 232 are hydraulic chambers, so that the extension or retraction of the piston rod 25 can be changed by controlling one of the two chambers to enter oil and the other to return oil; in addition, in other embodiments, the hydraulic cylinder 20 can also be constructed as a hydraulic cylinder 20 in which one of the first chamber 231 and the second chamber 232 is a hydraulic chamber, and the other is equipped with an elastic member for resetting the piston 24. For example, the resetting member can be a spring, and the hydraulic cylinder 20 can be a spring cylinder, so that only one chamber is used as a hydraulic chamber, and the extension or retraction of the piston rod can also be achieved by controlling the oil entry and oil return of the hydraulic chamber. When both chambers are hydraulic chambers, in some embodiments, the hydraulic cylinder can be a one-way hydraulic cylinder, that is, only one side of the piston is connected to a piston rod, and at this time, one of the two hydraulic chambers is used as a rod chamber and the other as a rodless chamber. In some other embodiments, the hydraulic cylinder can also be a bidirectional hydraulic cylinder, that is, both sides of the piston are connected to the piston rod 25, so that the two hydraulic chambers are rod chambers, so that the two piston rods 25 can be used to control two actuators at the same time. For example, in the steering hydraulic system provided by the present invention described below, the two piston rods can simultaneously control the steering of two vehicles on the same side.

[0052] The structure of the hydraulic cylinder 20 of the present disclosure is briefly described below. In order to realize the integration of the steering device, in some embodiments, the annular body 21 includes an outer cylinder body 211 and an inner cylinder body 212 spaced apart and sleeved in the outer cylinder body 211, the working oil port 27 is arranged on the cylinder wall of the outer cylinder body 211, so as to be connected with the external oil circuit, an annular accommodating chamber 22 is formed between the outer cylinder body 211 and the inner cylinder body 212, the working chamber 23 is formed in the inner cylinder body 212, and the working oil passage 29 is formed on the cylinder wall of the inner cylinder body 212. The working chamber 23 is connected with the working oil port 27 through the working oil passage 29.

[0053] The reversing device 26 includes a switching member 262 movably disposed in the annular accommodating chamber 22, and a switching flow channel 28 is formed on the switching member 262. By controlling the movement of the switching member 262, the switching flow channel 28 can change the flow direction of the medium in the working oil channel 29. Thus, the chamber for inputting the pressure medium and the chamber for outputting the pressure medium connected to the working oil channel 29 can be switched to change the moving direction of the piston 24 in the working chamber 23, thereby changing the working state of the piston rod 25.

[0054] In the above-mentioned embodiment, the switching member 262 can move along the axial direction of the inner cylinder body 212. In other possible embodiments, the switching member 262 can also be designed to rotate around the circumferential direction of the inner cylinder body 212, or other movement modes, so that the working oil port 27 can be connected to different working oil passages 29 through the switching flow channel 28. There is no limitation here. In addition, there is no limitation here on the movement mode of the switching member 262. It is sufficient that the working oil port 27 can be connected to different working oil passages 29 through the movement of the switching member 262.

[0055] In some embodiments, the switching member 262 is switched by axial movement, there are multiple working oil channels 29 and each working oil channel 29 has at least one external oil channel port 29a, and the multiple external oil channel ports 29a are arranged along the axial direction of the cylinder 201. The switching member 262 is constructed as a sliding member 2620 that can slide along the axial direction of the cylinder 201, so as to control the sliding of the sliding member 2620 so as to enable the multiple external oil channel ports 29a to be located on the moving path of the oil port of the switching channel 28 that is connected to the external oil channel port 29a, so that the sliding member 2620 can switch the channel 28 to different external oil channel ports 29a during the movement, thereby enabling the switching channel 28 to connect and cut off different external oil channel ports 29a, thereby switching the hydraulic chamber oil inlet or oil return state by switching different working oil channels 29.

[0056] like Figures 1 to 4 As described, in some embodiments, the first chamber 231 and the second chamber 232 of the hydraulic cylinder 20 are both hydraulic chambers. In this case, there are at least two working oil ports 27, which serve as the oil inlet 271 and the oil return port 272 respectively. In this way, one of the two hydraulic chambers can be connected to the oil inlet 271, while the other hydraulic chamber can be connected to the oil return port 272. By changing the medium flow direction of the working oil channel 29, the switching of the oil inlet or oil return working states of the two hydraulic chambers can be achieved.

[0057] At this time, there are at least two working oil passages 29, and the two working oil passages 29 correspond to the two working oil ports 27 and the two hydraulic chambers respectively, so that when the working oil port 27 serving as the oil inlet port 271 supplies oil to one hydraulic chamber through one of the working oil passages 29, the working oil port serving as the oil return port 272 of the two working oil ports 27 can discharge the pressure medium of the other hydraulic chamber in the two chambers through the other working oil passage 29, so that the piston 24 and the piston rod 25 arranged on the piston 24 can move smoothly.

[0058] In some embodiments, Figures 5 to 7As shown, the switching flow channel 28 connects the outer surface and the inner surface of the sliding member 2620. The switching flow channel 28 has a plurality of switching external oil ports 281 located on the outer surface of the sliding member 2620. The plurality of switching external oil ports 281 are arranged along the axial direction of the cylinder 201 for selectively connecting with the same working oil port 27. The switching flow channel 28 also has a switching internal oil port 282 located on the inner surface of the sliding member 2620. The switching internal oil port 282 is connected with each switching external oil port 281. The switching internal oil port 282 is used to connect with the oil channel external oil port 29a. Among them, the outer surface of the sliding member 2620 is used to fit the inner wall surface of the outer cylinder body 211, and the inner wall surface of the sliding member 2620 is used to fit the outer wall surface of the inner cylinder body 212, so that during the movement of the sliding member 2620, the switching external oil port 281 on the outer surface of the sliding member 2620 is connected with the working oil port 27 and the switching internal oil port 282 on the inner surface of the sliding member 2620 is connected with the external oil port 29a of the oil channel set on the outer wall of the inner cylinder body 212.

[0059] In the above-mentioned implementation mode, if Figures 1 to 7 As shown, the switching flow channel 28 has a switching inner oil port 282 disposed on the inner surface of the sliding member 2620 and a plurality of switching outer oil ports 281 disposed on the outer surface of the sliding member 2620, and the plurality of switching outer oil ports 281 are arranged along the axial direction of the cylinder barrel 201. When the sliding member 2620 moves along the axial direction, the switching inner oil port 282 is connected to different working oil passages 29 through different oil passage outer oil ports 29a, and the switching outer oil port 281 can also be connected to the same working oil port 27 through different switching outer oil ports 281 among the plurality of switching outer oil ports 281 of the switching flow channel 28, so that the working oil port 27 can be connected to different working oil passages 29 through the switching flow channel 28.

[0060] When the chambers connected to the working oil passage 29 are different, the different chambers can be connected to the same working oil port 27, that is, the pressure medium can be provided to different chambers or the pressure medium of different chambers can be discharged through the working oil port 27. When the function of the working oil port 27 remains unchanged, the bidirectional movement of the piston 24 in the hydraulic cylinder 20 can be realized by the movement of the sliding member 2620. In addition, the different switching external oil ports 281 of the same switching flow passage 28 are arranged at intervals, so that in the process of switching the external oil port 29a of the oil passage that is switched by the switching internal oil port 282, the working oil port 27 can block the pressure medium through the outer surface of the sliding member 2620 in the gap between the switching external oil ports 281, so as to facilitate the switching of the switching internal oil port 282 during the movement of the sliding member 2620. In some other embodiments, the switching external oil port 281 may also be a long hole structure extending in the axial direction, which can also make the sliding member 2620 correspond to the same working oil port 27 when it is located at different axial positions.

[0061] In some embodiments, Figures 5 to 7The outer wall surface of the inner cylinder body 212 is an arc-shaped outer wall surface, and the inner wall surface of the outer cylinder body 211 is an arc-shaped inner wall surface. Therefore, the sliding member 2620 can be constructed as an arc-shaped block, which has an arc-shaped inner surface that fits with the outer surface of the inner cylinder body 212 and an arc-shaped outer surface that fits with the inner surface of the outer cylinder body 211. This enables the sliding member 2620 to better fit with the inner cylinder body 212 and the outer cylinder body 211, respectively, so as to facilitate the switching of the connection between the inner oil port 282 and the outer oil port 29a of the oil channel and the switching of the connection between the outer oil port 281 and the working oil port 27.

[0062] In some embodiments, when the first chamber 231 and the second chamber 232 are both hydraulic chambers, the first chamber 231 is the first hydraulic chamber 2310, and the second chamber 232 is the second hydraulic chamber 2320. That is, the working chamber 23 includes the first hydraulic chamber 2310 and the second hydraulic chamber 2320 located on both sides of the piston 24, the working oil port 27 includes the oil inlet 271 and the oil return port 272, the working oil passage 29 includes the first working oil passage 291 and the second working oil passage 292, the first working oil passage 291 is connected to the first hydraulic chamber 2310, the second working oil passage 292 is connected to the second hydraulic chamber 2320, and the reversing device 26 can selectively connect the oil inlet 271 to one of the first working oil passage 291 and the second working oil passage 292, and the oil return port 272 to the other. , so that the pressure medium in the external oil circuit that enters the working oil port 27 serving as the oil inlet 271 can enter one of the first hydraulic chamber 2310 and the second hydraulic chamber 2320, and then the pressure medium in the other of the two hydraulic chambers can flow out to the external oil circuit through the oil return port 272 to push the piston 24 in the working chamber 23 to move, and the hydraulic chamber into which the pressure medium enters can be switched between the first hydraulic chamber 2310 and the second hydraulic chamber 2320 through the reversing device 26, so that the piston 24 moves in different directions, thereby changing the moving direction of the piston rod 25.

[0063] For example, the oil inlet 271 can be connected to the first hydraulic chamber 2310 through the first working oil channel 291 through the reversing device 26, and the second hydraulic chamber 2320 can be connected to the oil return port 272 through the second working oil channel 292. At this time, the pressure medium in the external oil circuit can enter the first hydraulic chamber 2310 through the oil inlet 271 and the first working oil channel 291, and the pressure medium in the second hydraulic chamber 2320 flows out to the external oil circuit through the second working oil channel 292 and the oil return port 272, so that the piston 24 moves in the working chamber 23 toward the first hydraulic chamber 2310. When the piston 24 needs to be reversed, the oil inlet 271 can be connected to the second hydraulic chamber 2320 through the second working oil passage 292, and the oil return port 272 can be connected to the first hydraulic chamber 2310 through the first working oil passage 291 through the reversing device 26. At this time, the pressure medium of the external oil circuit can enter the second hydraulic chamber 2320 through the oil inlet 271 and the second working oil passage 292, and the pressure medium in the first hydraulic chamber 2310 can flow out to the external oil circuit through the first working oil passage 291 and the oil return port 272, so that the piston 24 moves in the working chamber 23 toward the first hydraulic chamber 2310. The reversing device 26 allows the oil inlet 271 to selectively connect to one of the first hydraulic chamber 2310 and the second hydraulic chamber 2320, and the oil return port 272 to connect to the other of the first hydraulic chamber 2310 and the second hydraulic chamber 2320, so as to change the moving direction of the piston 24 in the working chamber 23.

[0064] In some embodiments, the working oil passage 29 further includes a third working oil passage 293, which is used to connect the oil inlet 271 and the oil return port 272. The reversing device 26 can connect the oil inlet 271 with the third working oil passage 293 and the oil return port 272 with the third working oil passage 293, that is, the reversing device 26 can connect the oil inlet 271 and the oil return port 272 with the third working oil passage 293 at the same time, so that the pressure medium entering the third working oil passage 293 through the oil inlet 271 can flow out directly through the oil return port 272, and the pressure medium does not enter the hydraulic chamber, so that the piston 24 does not move in the working chamber 23. That is, the working oil passage 29 provided by the present disclosure can be used to control the oil inlet and oil return state of the hydraulic chamber through the change of the flow direction of the pressure medium, and can also be used to control whether the oil from the working oil port enters the hydraulic chamber, thereby controlling whether the piston rod performs telescopic operation.

[0065] In this way, Figures 1 to 4As shown, through the control of the reversing device 26, the working oil port 27 as the oil inlet 271 can be connected to one of the first working oil passage 291 and the second working oil passage 292, and the oil return port 272 is connected to the other, so that when the pressure medium in the external oil circuit enters the hydraulic cylinder 20, the piston 24 in the hydraulic cylinder 20 can move in the working chamber 23, and the oil inlet 271 is connected to the first working oil passage 291 or the second working oil passage 292 through the reversing device 26, so that the pressure medium can enter different hydraulic chambers to achieve the reversal of the piston 24, that is, change the extension direction of the piston rod 25. At this time, for example, it can be used to control the left and right steering of the wheel.

[0066] When the oil inlet 271 and the oil return port 272 are simultaneously connected to the third working oil channel 293 through the reversing device 26, the pressure medium in the external oil circuit can enter the hydraulic cylinder 20 through the oil inlet 271 and then be discharged directly from the oil return port 272 through the third working oil channel 293, so that the piston 24 of the hydraulic cylinder 20 does not move, that is, the piston rod 25 does not extend or retract. At this time, for example, it can be used to control the wheel from turning.

[0067] In some embodiments, Figures 5 to 7 As shown, the first working oil channel 291 and the second working oil channel 292 respectively have an outer oil channel port 29a located on the outer wall of the inner cylinder body 212 and an inner oil channel port 29b located on the inner wall of the inner cylinder body 212, and the third working oil channel 293 has two outer oil channel ports 29a located on the outer wall of the inner cylinder body 212.

[0068] In the above-mentioned embodiment, the inner oil port 29b of the first working oil passage 291 is located on the inner wall of the inner cylinder body 212 and the outer oil port 29a of the oil passage is located on the outer wall of the inner cylinder body 212, so that the first working oil passage 291 can communicate with the working chamber 23 and the outer wall surface of the inner cylinder body 212; the inner oil port 29b of the second working oil passage 292 is located on the inner wall of the inner cylinder body 212 and the outer oil port is located on the outer wall of the inner cylinder body 212, so that the first working oil passage 291 can communicate with the working chamber 23 and the outer wall surface of the inner cylinder body 212. In addition, the outer oil port 29a of the first working oil passage 291 and the second working oil passage 292 can be communicated with the switching inner oil port 282 of the switching flow passage 28, so that the switching flow passage 28 can be communicated with the hydraulic chamber in the working chamber 23 through the first working oil passage 291 or the second working oil passage 292, and further the working oil port 27 can be communicated with the hydraulic chamber in the working chamber 23 through the switching flow passage 28 and the working oil passage 29.

[0069] In the present disclosure, the three working oil passages 29 can have various different implementations. In some implementations, for example, Figures 5 to 7As shown, the first working oil passage 291 or the second working oil passage 292 is constructed as a first oil passage structure in which the oil passage outer oil port 29a and the oil passage inner oil port 29b correspond to the hydraulic chamber on the same side, thereby introducing the pressure medium entering the oil supply port into the hydraulic chamber on the same side as the oil supply port. Alternatively, the first working oil passage 291 or the second working oil passage 292 is constructed as a second oil passage structure in which the oil passage outer oil port 29a and the oil passage inner oil port 29b correspond to different hydraulic chambers, thereby introducing the pressure medium entering the oil supply port into the hydraulic chamber on the different side of the oil supply port. At this time, the first working oil passage 291 and the second working oil passage 292 and the two oil passage structures have four combinations, that is, the two working oil passages 29 can both be the first oil passage structure, can both be the second oil passage structure, or can one be the first oil passage structure and the other be the second oil passage structure.

[0070] In addition, the third working oil passage 293 is constructed as a third oil passage structure in which two oil passage outer oil ports 29a correspond to different hydraulic chambers.

[0071] In some embodiments, the first oil channel structure may include a first straight segment 29c, which extends radially along the inner cylinder body 212, and the outer oil port 29a and the inner oil port 29b are located at both ends of the first straight segment 29c, that is, a straight oil hole structure is constructed, and the inner oil port 29b and the outer oil port 29a of the first working oil channel 291 constructed as the first oil channel structure correspond to the hydraulic chamber on the same side, that is, the pressure medium entering the hydraulic cylinder 20 through the oil inlet 271 can directly enter the hydraulic chamber on the side where the oil inlet 271 is located through the first working oil channel 291 constructed as the first oil channel structure. In addition, the inner oil port 29b and the outer oil port 29a of the second working oil channel 292 constructed as the first oil channel structure correspond to the hydraulic chamber on the same side. That is, when the pressure medium is discharged from the hydraulic chamber, the pressure medium in the hydraulic chamber on the side where the return oil port 272 is located can be directly discharged to the return oil port 272 through the second working oil channel 292 constructed as the first oil channel structure, and discharged from the return oil port 272.

[0072] In some embodiments, the second oil passage structure includes a first arc segment 29d and a second straight segment 29e, wherein the first arc segment 29d extends along the circumference of the inner cylinder body 212, and the second straight segment 29e extends along the axial direction of the inner cylinder body 212, and the outer oil port 29a of the oil passage is located at one end of the first arc segment 29d, and the inner oil port 29b of the oil passage is located at one end of the second straight segment 29e. Without changing the oil inlet 271, the pressure medium can enter the hydraulic cavity on the other side of the inner oil port 29b of the working oil passage 29 through the first working oil passage or the second working oil passage 292 constructed as the second oil passage structure after entering the oil supply port. In addition, the first arc segment 29d makes the second straight segment 29e and its corresponding inner oil port 29b of the oil passage located on different sides of the outer oil port 29a of the oil passage, so as to facilitate the use of the hole wall space of the inner cylinder body 212. In some other implementations, the second oil channel structure may also only include the second straight segment 29e. In this case, the inner oil channel port 29b and the outer oil channel port 29a of the working oil channel 29 constructed as the second oil channel structure are arranged on the same side.

[0073] In the above-mentioned embodiment, the first working oil passage 291 and the second working oil passage 292 can be configured arbitrarily according to actual needs. For example, the first working oil passage 291 and the second working oil passage 292 can both be configured as the first oil passage structure, or the first working oil passage 291 and the second working oil passage 292 can both be configured as the second oil passage structure. Figures 1 to 8 As shown, when there are two first working oil passages 291 and two second working oil passages 292, the two first working oil passages 291 can be respectively configured as the first oil passage structure and the second oil passage structure, and the two second working oil passages 292 can be respectively configured as the first oil passage structure and the second oil passage structure. The two first working oil passages 291 can respectively correspond to different hydraulic chambers, and the two second working oil passages 292 can also respectively correspond to different hydraulic chambers.

[0074] In addition, the third oil channel structure includes a third straight segment 29f and a second arc segment 29h, the third straight segment 29f extends along the axial direction of the inner cylinder body 212, and the two second arc segments 29h extend along the circumferential direction of the inner cylinder body 212, and the two oil channel outer oil ports 29a are respectively located at one end of the two second arc segments 29h, that is, the two second arc segments 29h are respectively connected at both ends of the third straight segment 29f, and the two oil channel outer oil ports 29a are respectively located at one end of the two second arc segments 29h away from the third straight segment 29f, so that the oil inlet 271 and the oil return port 272 can be respectively connected to the two oil channel outer oil ports 29a of the third working oil channel 293 constructed as the third oil channel structure through different switching flow channels 28.

[0075] In addition, in order to prevent the third straight line segment 29f and the second straight line segment 29e from interfering with each other, the third straight line segment 29f and the second straight line segment 29e can be located on both sides of the inner cylinder body 212, which is convenient for arranging the second straight line segment 29e and the third straight line segment 29f. In other embodiments, they can also be located on the same side.

[0076] In some embodiments, there are two first working oil passages 291 and two second working oil passages 292, the inner oil ports 29b of the two first working oil passages 291 are connected to the first hydraulic chamber 2310, and the outer oil ports 29a of the oil passages correspond to the first hydraulic chamber 2310 and the second hydraulic chamber 2320, respectively; the inner oil ports 29b of the two second working oil passages 292 are connected to the second hydraulic chamber 2320, and the outer oil ports 29a of the oil passages correspond to the second hydraulic chamber 2320 and the first hydraulic chamber 2310, respectively. At this time, whether it is a two-way pump or a one-way pump, only the reversing device can be controlled to change the working state of the piston rod. Specifically, it will be combined with Figures 2 to 4 The three working modes are described in detail.

[0077] like Figures 1 to 6 As shown, the number of switching channels 28 is also two, and each switching channel 28 has three switching external oil ports 281 arranged along the axial direction of the cylinder barrel 201. There are two working oil ports 27, one of which is an oil inlet 271 and the other is an oil return port 272. The hydraulic cylinder 20 is a bidirectional hydraulic cylinder, and the piston 24 is provided with a first piston rod 251 and a second piston rod 252. Based on the structure of the hydraulic cylinder 20 in the figure, several working modes of the hydraulic cylinder 20 are briefly described.

[0078] First, the discussion is made under the condition that a certain working oil port 27 of the hydraulic cylinder 20 is fixed as the oil inlet 271, and for the convenience of description, based on the figure, the side where the first hydraulic chamber 2310 is located is defined as the left side of the cylinder barrel 201 with the piston 24 as the dividing line. The side where the second hydraulic chamber 2320 is located is defined as the right side of the cylinder barrel 201.

[0079] When the hydraulic cylinder 20 is in the first working mode, Figure 2As shown, the middle one of the three switching external oil ports 281 of the switching flow channel 28 located on the left side of the cylinder 201 on the sliding member 2620 is connected to the oil inlet 271, and the switching internal oil port 282 is connected to the first working oil channel 291 of the first oil channel structure which is located on the left side of the cylinder 201 and is constructed as a first oil channel structure. The middle one of the three switching external oil ports 281 of the switching flow channel 28 on the sliding member 2620 located on the right side of the cylinder 201 is connected to the return oil port 272, and the switching internal oil port 282 is connected to the second working oil channel of the oil channel external oil port 29a located on the right side of the cylinder 201 and constructed as a first oil channel structure, so that the first hydraulic chamber 2310 and the oil inlet port 271 are connected, and the second hydraulic chamber 2320 and the oil return port 272 are connected, the pressure medium in the external oil circuit enters the first hydraulic chamber 2310 through the oil inlet port 271, and the pressure medium in the second hydraulic chamber 2320 is discharged from the return oil port 272, so that the piston 24 moves toward the second hydraulic chamber 2320, thereby retracting the first piston rod 251 and extending the second piston rod 252.

[0080] When the hydraulic cylinder 20 is in the second working mode, Figure 3 As shown, one of the three switching external oil ports 281 of the switching flow channel 28 on the sliding member 2620 located on the left side of the cylinder barrel 201, which is close to the second hydraulic chamber 2320, is connected to the oil inlet 271, and the switching internal oil port 282 is connected to the second working oil channel 292 of the oil channel external oil port 29a located on the left side of the cylinder barrel 201 and constructed as a second oil channel structure; and one of the three switching external oil ports 281 of the switching flow channel 28 on the sliding member 2620 located on the right side of the cylinder barrel 201, which is away from the first hydraulic chamber 2310, is connected to the oil return port 272, and the switching internal oil port 282 is connected to the first working oil channel 291 of the oil channel external oil port 29a located on the right side of the cylinder barrel 201 and constructed as a second oil channel structure, so that the oil inlet 271 is connected to the second hydraulic chamber 2320 and the oil return port 272 is connected to the first hydraulic chamber 2310. When the pressure medium in the external oil circuit enters the second hydraulic chamber 2320 through the oil inlet 271, the pressure medium in the first hydraulic chamber 2310 is discharged from the oil return port 272, so that the piston 24 moves toward the first hydraulic chamber 2310, the first piston rod 251 extends and the second piston rod 252 retracts.

[0081] When the hydraulic cylinder 20 is in the third working mode, Figure 4As shown, the oil inlet 271 is connected with the switching external oil port 281 away from the second hydraulic chamber 2320 among the three switching external oil ports 281 of the switching flow channel 28 on the left side of the cylinder barrel 201 on the sliding member 2620, and the switching internal oil port 282 is connected with the oil channel external oil port 29a of the third working oil channel 293 located on the left side of the cylinder barrel 201; the oil return port 272 is connected with the switching external oil port 281 close to the first hydraulic chamber 2310 among the three switching external oil ports 281 of the switching flow channel 28 on the right side of the cylinder barrel 201 on the sliding member 2620, and the switching internal oil port 282 of the switching flow channel 28 is connected with the oil channel external oil port 29a of the third working oil channel 293 located on the right side of the cylinder barrel 201. That is, the oil inlet 271 is connected with the oil return port 272 through the third working oil channel 293. So that when the pressure medium in the external oil circuit enters the third working oil channel 293 through the oil inlet 271 and the switching channel 28 on the left side of the cylinder 201, it can be discharged from the return oil port 272 after passing through the third working oil channel 293 and then through the switching channel 28 on the right side of the cylinder 201. At this time, the piston 24 and the piston rod 25 will not move due to the pressure change in the hydraulic chamber.

[0082] It should be noted that the above are three working modes of the hydraulic cylinder 20 generated as the sliding member 2620 moves under the working condition that the working oil port 27 on the left side of the cylinder barrel 201 is the oil inlet 271, and the working oil port 27 on the right side of the cylinder barrel 201 is the oil return port 272. Under the working condition that the working oil port 27 on the right side of the cylinder barrel 201 is the oil inlet 271, and the working oil port 27 on the left side of the cylinder barrel 201 is the oil return port 272, the hydraulic cylinder 20 also has three working modes, which can be defined as the fourth working mode, the fifth working mode and the sixth working mode. Among them, the fourth working mode, the fifth working mode and the sixth working mode have corresponding relationships with the first, second and third working modes respectively. When the hydraulic cylinder 20 is in the fourth working mode, the communication relationship between the working oil port 27, the switching flow channel 28, and the working oil channel 29 in the hydraulic cylinder 20 is the same as that of the hydraulic cylinder 20 in the first working mode, and the flow direction of the pressure medium in the hydraulic cylinder 20 is opposite to that of the hydraulic cylinder 20 in the first working mode, so that the movement direction of the piston 24 of the hydraulic cylinder 20 in the fourth working mode is opposite to that of the piston 24 in the first working mode. When the hydraulic cylinder 20 is in the fifth working mode, the communication relationship between the working oil port 27, the switching flow channel 28, and the working oil channel 29 in the hydraulic cylinder 20 is the same as that of the hydraulic cylinder 20 in the second working mode, and the flow direction of the pressure medium in the hydraulic cylinder 20 is opposite to that of the hydraulic cylinder 20 in the second working mode, so that the movement direction of the piston 24 of the hydraulic cylinder 20 in the fifth working mode is opposite to that of the piston 24 in the second working mode. When the hydraulic cylinder 20 is in the sixth working mode, the connection relationship between the working oil port 27, the switching flow channel 28, and the working oil channel 29 in the hydraulic cylinder 20 is the same as that of the hydraulic cylinder 20 in the third working mode, and the flow direction of the pressure medium in the hydraulic cylinder 20 is opposite to that of the hydraulic cylinder 20 in the third working mode, so that the movement direction of the piston 24 of the hydraulic cylinder 20 in the sixth working mode is opposite to the movement direction of the piston 24 in the third working mode.

[0083] It should be understood that when the hydraulic cylinder 20 is a bidirectional hydraulic cylinder and the piston rod 25 includes a first piston rod 251 and a second piston rod 252, the movement of the piston 24 in the working chamber 23 along the axial direction of the inner cylinder body 212 can be positioned by the external structure connected to the piston rod 25, so that the piston rod 25 stops moving after being pushed by the pressure medium for a certain distance and then being reacted by the external device, thereby avoiding the interference between the piston 24 and the oil port 29b in the oil channel of the working oil channel 29 caused by excessive movement of the piston 24. For example, in the hydraulic system provided by the present disclosure, when the piston rod 25 is connected to the steering mechanism, the stroke of the steering mechanism can be used to limit the stroke of the piston rod.

[0084] In addition, in some embodiments, the reversing device 26 can be constructed in different forms. For example, the reversing device 26 can be constructed as an electromagnetic reversing device 26. Or in other embodiments, the reversing device 26 can also be a hydraulic reversing device 26, which can realize the movement of the switching member 262 in the annular accommodating chamber 22, and is not limited here.

[0085] In some embodiments, the reversing device 26 includes an electromagnetic coil 261 accommodated in the annular accommodating cavity 22, and the switching member 262 is made of magnetic material. The electromagnetic coil 261 is used to drive the switching member 262 to reciprocate in the annular accommodating cavity 22, so that the working oil port 27 can be connected to different working oil channels 29 through the switching flow channel 28 on the switching member 262.

[0086] In the above-mentioned embodiment, the electromagnetic coil 261 can be controlled to attract or repel the switching member 262 by controlling the direction of the current in the electromagnetic coil 261, so as to drive the switching member 262 to move in the annular accommodating chamber 22. As for the positioning of the switching member 262 during the movement process, the moving distance of the switching member 262 can be controlled by controlling the on-off time of the electromagnetic coil 261, thereby realizing the positioning of the switching member 262; or a position sensor can be installed in the annular accommodating chamber 22, and the electromagnetic coil 261 can be controlled by the data feedback detected by the position sensor, thereby realizing the positioning of the switching member 262 during the movement process. In addition, a reset spring (not shown in the figure) can also be provided on the opposite side of the electromagnetic coil 261 of the switching member 262, and the movement of the switching member 262 in the annular accommodating chamber 22 can be positioned by the cooperation of the reset spring and the electromagnetic coil 261.

[0087] In some embodiments, the hydraulic cylinder 20 is a steering hydraulic cylinder, and the hydraulic cylinder 20 is used in a vehicle.

[0088] A second aspect of the present disclosure provides a hydraulic system for a vehicle, such as Figures 9 to 14 As shown, it includes a hydraulic pump 10 and a steering hydraulic cylinder 200. The steering hydraulic cylinder 200 is the hydraulic cylinder 20 provided by the first aspect of the present disclosure, and the steering hydraulic cylinder 200 is connected to the hydraulic pump 10 to drive the wheels of the vehicle to rotate.

[0089] In some embodiments, the steering hydraulic cylinder 20 is a bidirectional hydraulic cylinder 20 and includes a first hydraulic cylinder 20a and a second hydraulic cylinder 20b, wherein the first hydraulic cylinder 20a is used to drive the two front wheels of the vehicle, and the second hydraulic cylinder 20b is used to drive the two rear wheels of the vehicle. Specifically, the first piston rod 251 and the second piston rod 252 of the first hydraulic cylinder 20a are both provided with a steering tie rod 80, and the two piston rods 25 are respectively connected to the steering knuckles of the front wheels of the vehicle through the two steering tie rods 80, so that when the piston rod 25 of the first hydraulic cylinder 20a moves, the two front wheels of the vehicle are driven to steer at the same time. In addition, the first piston rod 251 and the second piston rod 252 of the second hydraulic cylinder 20b are also both provided with a steering tie rod 80, and the steering tie rod 80 is connected to the steering knuckles of the rear wheels of the vehicle, so that when the piston rod 25 of the second hydraulic cylinder 20b moves, the two rear wheels of the vehicle are driven to steer at the same time. By driving two steering hydraulic cylinders 20 simultaneously with one hydraulic pump 10, the setting of the hydraulic pump 10 can be reduced, saving chassis space.

[0090] In some embodiments, the hydraulic pump 10 is configured as a bidirectional hydraulic pump 100, and the two working oil ports 27 of the bidirectional hydraulic pump 100 are respectively connected to the working oil ports 27 of the hydraulic cylinder 20 through the first main oil circuit 60 and the second main oil circuit 70. To form a closed hydraulic system, no additional oil tank is required, and the arrangement of hydraulic pipelines and components is reduced, further saving the space of the chassis. In other possible embodiments, an open hydraulic system of the hydraulic pump 10 and the hydraulic oil tank may also be used, which is not limited by the present disclosure.

[0091] In some embodiments, the hydraulic system further includes a hydraulic brake circuit 30 and a hydraulic suspension circuit 40. The hydraulic brake circuit 30 and the hydraulic suspension circuit 40 are respectively connected in parallel to the first main oil circuit 60 and the second main oil circuit 70. In addition, the first hydraulic cylinder 20a and the second hydraulic cylinder 20b are also connected in parallel to the first main oil circuit 60 and the second main oil circuit 70. That is, the hydraulic brake circuit 30, the hydraulic suspension circuit 40, the first hydraulic cylinder 20a and the second hydraulic cylinder 20b are all connected in parallel to the first main oil circuit 60 and the second main oil circuit 70. The provision of the first main oil circuit 60 and the second main oil circuit 70 facilitates the communication between the hydraulic brake circuit 30, the hydraulic suspension circuit 40, the first hydraulic cylinder 20a and the second hydraulic cylinder 20b and the bidirectional hydraulic pump 100.

[0092] In some embodiments, a hydraulic brake circuit 30 and a hydraulic suspension circuit 40 are designed for each wheel of the vehicle to control it. Fig. 9 As shown, when the vehicle is a four-wheel vehicle, there are four hydraulic brake circuits 30 and four hydraulic suspension circuits 40. There are two steering hydraulic cylinders 20, namely, a first hydraulic cylinder 20a for controlling the rotation of the front wheels of the vehicle and a second hydraulic cylinder 20b for controlling the rotation of the rear wheels of the vehicle.

[0093] In addition, the first main oil circuit 60 and the second main oil circuit 70 connected to the working oil port 27 of the bidirectional hydraulic pump 100 are both connected to the accumulator 50, so that the pressure in the hydraulic system can be maintained within the pressure range required by the hydraulic system, such as the hydraulic brake circuit 30, the hydraulic suspension circuit 40 and the steering cylinder 20.

[0094] In some embodiments, Figures 9 to 14 As shown, in the hydraulic brake circuit 30, a switch valve 31 and a pressure reducing valve 34 are included. The hydraulic brake circuit 30 includes a brake oil inlet 37, a brake mechanism 33 and a brake oil return 38. One end of the brake oil inlet 37 is connected to the brake mechanism 33, and the other end of the brake oil inlet 37 is connected to the hydraulic pump 10. The switch valve 31 is arranged in the brake oil inlet 37, and is used to control the on-off of the brake oil inlet 37, so that the switch valve 31 can be opened when braking is required, so that the pressure medium of the hydraulic pump 10 flows into the hydraulic brake oil inlet 37. The brake oil return 38 is connected between the switch valve 31 of the brake oil inlet 37 and the brake mechanism 33, and a pressure reducing valve 34 is arranged on the brake oil return 38, and is used to discharge the pressure medium delivered to the brake mechanism 33.

[0095] In addition, the hydraulic brake circuit 30 also includes a pressure-maintaining valve 32, which is arranged in the brake oil inlet 37, and the oil inlet of the pressure-maintaining valve 32 is connected to the oil outlet of the switch valve 31, and the oil outlet of the pressure-maintaining valve 32 is connected to the brake oil return 38 and the brake mechanism 33, and the pressure-maintaining valve 32 can be used to increase the pressure of the brake mechanism 33. The pressure-maintaining valve 32 can be an ABS proportional valve, which is not limited here.

[0096] In addition, in some embodiments, a first one-way valve 35 is provided on the brake oil inlet circuit 37 to allow the hydraulic pump 10 to provide pressure medium to the brake mechanism 33 through the first one-way valve 35. A second one-way valve 36 is provided on the brake oil return circuit 38 to allow the pressure medium in the brake oil return circuit 38 to be discharged through the second one-way valve 36.

[0097] When the hydraulic pump 10 is a bidirectional hydraulic pump 100, the oil inlet end of the brake oil inlet circuit 37 can be connected to the first main oil circuit 60 and the second main oil circuit 70 through two branches respectively. A first one-way valve 35 is respectively provided on the two branches of the brake oil inlet circuit 37 to allow the pressure medium to enter the hydraulic brake circuit 30 through the branch of the brake oil inlet circuit 37 connected to the first main oil circuit 60 and the second main oil circuit 70 when one of the first main oil circuit 60 and the second main oil circuit 70 is the main oil supply circuit.

[0098] In addition, the oil outlet end of the brake oil return circuit 38 can be connected to the first main oil circuit 60 and the second main oil circuit 70 respectively through two branches. Two second one-way valves 36 are respectively arranged on the two branches of the brake oil return circuit 38 to allow the pressure medium of the brake oil inlet circuit 37 and the brake mechanism 33 to enter the first main oil circuit 60 or the second main oil circuit 70 serving as the main oil return circuit when one of the first main oil circuit 60 and the second main oil circuit 70 serves as the main oil return circuit, and flow back to the bidirectional hydraulic pump 100 through the other main oil circuit.

[0099] The present disclosure describes the working process of the hydraulic brake circuit 30 by way of example. The hydraulic pump 10 is a bidirectional hydraulic pump 100. Both the first main oil circuit 60 and the second main oil circuit 70 can be used as oil supply circuits. The following description takes the first main oil circuit 60 as the oil supply circuit. When braking is not required, the switch valve 31 is in a closed state, and the pressure medium in the first main oil circuit 60 is isolated from the hydraulic brake circuit 30. Other hydraulic suspension circuits and steering hydraulic cylinders will not affect the hydraulic brake circuit 30 when working. When pressure build-up braking is required, such as Fig.10 As shown, the arrow direction in the figure indicates the flow direction of the pressure medium. The switch valve 31 and the pressure-maintaining valve 32 are opened, and the pressure reducing valve 34 is closed. Under the pressure of the bidirectional hydraulic pump 100, the pressure medium in the first main oil circuit 60 enters the hydraulic brake oil inlet circuit 37 through the branch of the brake oil inlet circuit 37 connected thereto, and then enters the brake mechanism 33 through the brake oil inlet circuit 37 to build up pressure for the brake mechanism 33 to achieve the driving brake effect.

[0100] When you need to release the brake, Fig.11 As shown, the direction of the arrow in the figure indicates the flow direction of the pressure medium. The switch valve 31 is disconnected, the pressure maintaining valve 32 and the pressure reducing valve 34 are connected, and the pressure medium in the brake mechanism 33 and the brake return oil circuit 38 is depressurized by the pressure reducing valve 34, and then the pressure medium returns to the bidirectional hydraulic pump 100 through the second main oil circuit 70.

[0101] When the second main oil circuit 70 is used as the oil supply circuit for braking or releasing the brake, the operation process is the same as that when the first main oil circuit 60 is used as the oil supply circuit, the difference is that when the pressure medium enters the brake oil inlet circuit 37 from the second main oil circuit 70, the pressure medium passes through the branch of the brake oil inlet circuit 37 differently from when the first main oil circuit 60 is used as the oil supply circuit, and when the pressure medium is discharged from the brake oil return circuit 38 to the first main oil circuit 60, the pressure medium passes through the branch of the brake oil return circuit 38 differently from when the first main oil circuit 60 is used as the oil supply circuit. The working process of the hydraulic brake circuit 30 when the second main oil circuit 70 is used as the oil supply circuit will not be described here.

[0102] like Figures 9 to 14As shown, in some embodiments, the hydraulic suspension circuit 40 includes a first reversing valve 41, and the hydraulic suspension circuit 40 also includes a suspension shock absorber 43. The suspension shock absorber 43 is connected to the hydraulic pump 10 through the first reversing valve 41. The hydraulic pump 10 can provide pressure medium to the suspension shock absorber 43 through the first reversing valve 41. The first reversing valve 41 can control the flow direction of the pressure medium in the hydraulic suspension circuit 40 to control the working state of the suspension shock absorber 43.

[0103] In the above-mentioned embodiment, the suspension shock absorber 43 includes a first rod chamber 432 and a first rodless chamber 431. The first rod chamber 432 and the first rodless chamber 431 are respectively connected to the two working oil ports of the first reversing valve 41. The oil inlet of the first reversing valve 41 is connected to the oil supply port of the hydraulic pump 10. The first reversing valve 41 switches different working positions, so that the hydraulic pump 10 can pass the pressure medium through the first reversing valve 41 into the first rod chamber 432 or the first rodless chamber 431, which is used to control the suspension shock absorber 43 to switch between the lifting state and the falling state.

[0104] When the hydraulic pump 10 passes the pressure medium into the first rodless chamber 431, the pressure medium in the first rod chamber 432 is discharged, so that the piston rod of the suspension shock absorber 43 is extended, the suspension shock absorber 43 is in a lifting state, and the suspension shock absorber 43 can lift the vehicle body. When the hydraulic pump 10 passes the pressure medium into the first rod chamber 432, the pressure medium in the first rodless chamber 431 is discharged, so that the piston rod of the suspension shock absorber 43 is retracted, the suspension shock absorber 43 is in a falling state, and the suspension shock absorber 43 can make the vehicle body height fall back.

[0105] The first one-way throttle valve 42 may be respectively arranged on the oil path connecting the first rodless chamber 431 and the first reversing valve 41 and the oil path connecting the first rod chamber 432 and the first reversing valve 41 to adjust the speed of the piston rod of the suspension shock absorber 43 extending and falling back. It should be understood that in other possible implementations, the first one-way throttle valve 42 may also be constructed as a valve group composed of other forms of valves, as long as it can achieve the same function as the first one-way throttle valve 42, and this is not limited here.

[0106] In some specific embodiments, when the hydraulic pump 10 is a bidirectional hydraulic pump 100, the oil inlet of the first reversing valve 41 is connected to one oil supply port of the bidirectional hydraulic pump 100, and the oil return port of the first reversing valve 41 is connected to the other oil supply port of the bidirectional hydraulic pump 100. According to the different rotation directions of the bidirectional hydraulic pump 100, the oil inlet and the oil return port of the first reversing valve 41 are dynamically switched.

[0107] In addition, it should be understood that the first reversing valve 41 can be provided in any appropriate form according to actual needs, and is not limited here.

[0108] The present disclosure exemplarily describes the working process of the hydraulic suspension circuit 40. The hydraulic pump 10 is a bidirectional hydraulic pump 100, and the first main oil circuit 60 is used as the oil supply circuit for description.

[0109] The first reversing valve 41 is constructed as a three-position four-way valve. When the first reversing valve 41 is in the second position, Fig.12 As shown, the arrow direction in the figure is the flow direction of the pressure medium, and the suspension shock absorber 43 is in the lifting state. The two-way hydraulic pump 100 delivers the pressure medium in the first main oil circuit 60 into the first rodless chamber 431 through the first reversing valve 41, and the pressure medium in the first rod chamber 432 enters the second main oil circuit through the first reversing valve 41 and flows to the two-way hydraulic pump 100. The piston rod of the suspension shock absorber 43 extends to raise the height of the vehicle body.

[0110] When the first reversing valve 41 is in the first position, the suspension shock absorber 43 is in the falling state. Fig.13 As shown, the arrow direction in the figure indicates the flow direction of the pressure medium. The bidirectional hydraulic pump 10 pumps the pressure medium of the first main oil circuit 60 into the first rod chamber 432, and the pressure medium in the first rod chamber 432 enters the second main oil circuit 70 through the first reversing valve 41 and flows to the bidirectional hydraulic pump 100. The piston rod of the suspension shock absorber 43 retracts to make the height circuit of the vehicle body.

[0111] When the first reversing valve 41 is in the third position, the connection between the suspension shock absorber 43 and the bidirectional hydraulic pump 100 is disconnected, the suspension shock absorber 43 is in a steady state, and the first rodless chamber 431 and the first rod chamber 432 of the suspension shock absorber 43 are connected. When the vehicle passes through an uneven road or bumps, the suspension shock absorber 43 will experience compression and recovery. When the suspension shock absorber 43 is compressed, the piston rod of the suspension shock absorber 43 retracts, such as Fig.14 As shown, the direction of the arrow in the figure is the flow direction of the pressure medium. The pressure medium will flow out of the first rodless chamber 431, and flow into the first rod chamber 432 after passing through the first reversing valve 41 in the hydraulic brake circuit 30. When the suspension shock absorber 43 is restored, the suspension shock absorber 43 extends to restore to the position before compression. At this time, the pressure medium in the first rod chamber 432 of the suspension shock absorber 43 flows out, and flows into the first rodless chamber 431 after passing through the first reversing valve 41 in the hydraulic brake circuit 30.

[0112] In some embodiments, an accumulator (not shown in the figure) may be connected to the oil circuit in communication between the first rodless chamber 431 and the first reversing valve 41, and the accumulator is connected between the first one-way throttle valve 42 and the first reversing valve 41 in the oil circuit. An accumulator (not shown in the figure) may also be connected to the oil circuit in communication between the first rod chamber 432 and the first reversing valve 41, and the accumulator is connected between the first one-way throttle valve 42 and the first reversing valve 41 in the oil circuit. In the process of compression and recovery of the suspension shock absorber 43, one of the two accumulators in the hydraulic suspension circuit 40 acts or both act together to quickly adjust the oil pressure in the first rod chamber 432 and the first rodless chamber 431.

[0113] When the second main oil circuit 70 is used as the oil supply circuit, the oil inlet and the oil return port of the first reversing valve 41 are opposite to those when the first main oil circuit 60 is used as the oil supply circuit. When the first reversing valve 41 is switched to the first position and the second position, the flow direction of the pressure medium in the hydraulic suspension circuit 40 is opposite to that when the first main oil circuit 60 is used as the oil supply circuit. The working process of the hydraulic suspension circuit 40 will not be described in detail.

[0114] In some embodiments, the working process of the steering hydraulic cylinder 20 in the hydraulic system is described. For ease of description, the first hydraulic cylinder 20a is taken as an example. Figures 1 to 14 As shown, the first main oil circuit 60 is connected to the oil inlet 271 of the hydraulic cylinder 20, the second main oil circuit 70 is connected to the return port of the hydraulic cylinder 20, and the hydraulic pump 10 is a bidirectional hydraulic pump 100. When the first main oil circuit 60 is the main oil supply circuit and the second main oil circuit 70 is the main oil return circuit. When the first hydraulic cylinder 20a is in the first working mode, as shown in FIG. Figure 2 As described above, the piston 24 in the first hydraulic cylinder 20a moves toward the second hydraulic chamber 2320, the second piston rod 252 extends, and the first piston rod 251 retracts. When the first hydraulic cylinder 20a is in the second working mode, as shown in FIG. Figure 3As shown, the piston 24 in the first hydraulic cylinder 20a moves toward the direction of the first hydraulic chamber 2310, the first piston rod 251 extends, and the second piston rod 252 retracts. The first hydraulic cylinder 20a can make the front wheels of the vehicle rotate in opposite directions by switching between the first working mode and the second working mode. In addition, when the first hydraulic cylinder 20a is in the third working mode, the pressure medium entering the third working oil channel 293 of the first hydraulic cylinder 20a from the first main oil circuit 60 is directly discharged from the return oil port 272 of the first hydraulic cylinder 20a to the second main oil circuit 70. The piston 24 and the piston rod 25 do not move, and the third working mode of the first hydraulic cylinder 20a can be applied to the working condition of the vehicle going straight. When the second main oil circuit 70 is the main oil supply oil channel and the first main oil circuit 60 is the main oil return oil channel, the first hydraulic cylinder 20a can be in the fourth working mode, the fifth working mode and the sixth working mode, and the wheels of the vehicle can be rotated in different directions by switching between the fourth working mode and the fifth working mode. The moving directions of the piston 24 and the piston rod 25 of the first hydraulic cylinder 20a in the fourth working mode are opposite to those in the first working mode. The moving directions of the piston 24 and the piston rod 25 of the first hydraulic cylinder 20a in the fifth working mode are opposite to those in the second working mode, and the wheels of the vehicle can be prevented from deflecting by the sixth working mode. The working process of the second hydraulic cylinder 20b is the same as that of the first hydraulic cylinder 20a, and will not be described in detail here.

[0115] It should be noted that, in the hydraulic system, each hydraulic brake circuit 30, each hydraulic suspension circuit 40 and the two steering hydraulic cylinders 20 can operate independently and do not affect each other. In addition, the hydraulic pump 10 can be a high-power hydraulic pump 10 to meet the power demand of the hydraulic system.

[0116] A third aspect of the present disclosure provides a vehicle, comprising the hydraulic cylinder 20 provided in the first aspect of the present disclosure and / or the hydraulic system provided in the second aspect of the present disclosure.

[0117] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0118] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0119] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A hydraulic cylinder, characterized in that: The hydraulic cylinder comprises a cylinder, a piston and a piston rod connected to the piston, wherein the cylinder comprises an annular body and a working chamber surrounded by the annular body, the piston is movably arranged in the working chamber, the annular body is provided with a working oil passage and a working oil port connected to an external oil circuit, the working chamber is connected to the working oil port through the working oil passage, and the hydraulic cylinder further comprises: A reversing device is arranged in the annular body and is used to switch the flow direction of the medium in the working oil channel to change the working state of the piston rod.

2. The hydraulic cylinder according to claim 1, characterized in that: The annular body includes an outer cylinder body and an inner cylinder body spaced apart inside the outer cylinder body, the working oil port is arranged on the cylinder wall of the outer cylinder body, an annular accommodating chamber is formed between the outer cylinder body and the inner cylinder body, the working chamber is formed in the inner cylinder body, the working oil channel is formed on the cylinder wall of the inner cylinder body, the working chamber is connected with the working oil port through the working oil channel, the reversing device includes a switching member movably arranged in the annular accommodating chamber, a switching flow channel is formed on the switching member, and the switching flow channel can change the flow direction of the medium in the working oil channel by controlling the movement of the switching member.

3. The hydraulic cylinder according to claim 2, characterized in that: There are multiple working oil channels and each of the working oil channels has at least one external oil port. The multiple external oil ports are arranged along the axial direction of the cylinder. The switching member is constructed as a sliding member that can slide along the axial direction of the cylinder, so that the switching flow channel can open and close different external oil ports of the oil channel by controlling the sliding of the sliding member.

4. The hydraulic cylinder according to claim 3, characterized in that: The switching flow channel is connected to the outer surface and the inner surface of the sliding member, and the switching flow channel has a plurality of switching outer oil ports located on the outer surface of the sliding member, and the plurality of switching outer oil ports are arranged along the axial direction of the cylinder barrel, and are used to selectively communicate with the same working oil port, and the switching flow channel also has a switching inner oil port located on the inner surface of the sliding member, and the switching inner oil port is connected to each of the switching outer oil ports, and the switching inner oil port is used to communicate with the outer oil port of the oil channel, The sliding member is constructed as an arc-shaped block, which has an arc-shaped inner surface that fits with the outer surface of the inner cylinder body, and an arc-shaped outer surface that fits with the inner surface of the outer cylinder body.

5. The hydraulic cylinder according to claim 1, characterized in that: The working chamber includes a first hydraulic chamber and a second hydraulic chamber located on both sides of the piston, the working oil port includes an oil inlet and an oil return port, the working oil passage includes a first working oil passage and a second working oil passage, the first working oil passage is connected to the first hydraulic chamber, and the second working oil passage is connected to the second hydraulic chamber, the reversing device can selectively connect the oil inlet to one of the first working oil passage and the second working oil passage, and the oil return port is connected to the other.

6. The hydraulic cylinder according to claim 5, characterized in that: The working oil passage also includes a third working oil passage, and the third working oil passage is used to connect the oil inlet and the oil return port. The reversing device can also connect the oil inlet and the oil return port with the third working oil passage.

7. The hydraulic cylinder according to claim 6, characterized in that: The first working oil passage and the second working oil passage respectively have an outer oil passage opening located on the outer wall of the inner cylinder body and an inner oil passage opening located on the inner wall of the inner cylinder body, and the third working oil passage has two outer oil passage openings located on the outer wall of the inner cylinder body. The first working oil channel or the second working oil channel is constructed as a first oil channel structure in which the outer oil port of the oil channel and the inner oil port of the oil channel correspond to the hydraulic chamber on the same side, or is constructed as a second oil channel structure in which the outer oil port of the oil channel and the inner oil port of the oil channel correspond to different hydraulic chambers, and the third working oil channel is constructed as a third oil channel structure in which the two outer oil ports of the oil channel correspond to different hydraulic chambers.

8. The hydraulic cylinder according to claim 7, characterized in that: The first oil passage structure includes a first straight section, the first straight section extends along the radial direction of the inner cylinder body, the outer oil port of the oil passage and the inner oil port of the oil passage are located at two ends of the first straight section, the second oil passage structure includes a first arc section and a second straight section, the first arc section extends along the circumferential direction of the inner cylinder body, the second straight section extends along the axial direction of the inner cylinder body, the outer oil port of the oil passage is located at one end of the first arc section, and the inner oil port of the oil passage is located at one end of the second straight section, the third oil passage structure includes a third straight section and two second arc sections, the third straight section extends along the axial direction of the inner cylinder body, the two second arc sections both extend along the circumferential direction of the inner cylinder body, and the two outer oil ports of the oil passage are respectively located at one end of the two second arc sections, The third straight line segment and the second straight line segment are respectively located on two sides of the inner cylinder body.

9. The hydraulic cylinder according to any one of claims 5 to 8, characterized in that: There are two first working oil passages and two second working oil passages respectively, the inner oil passage ports of the two first working oil passages are both connected to the first hydraulic chamber, and the outer oil passage ports correspond to the first hydraulic chamber and the second hydraulic chamber respectively, and the inner oil passage ports of the two second working oil passages are both connected to the second hydraulic chamber, and the outer oil passage ports correspond to the second hydraulic chamber and the first hydraulic chamber respectively.

10. The hydraulic cylinder according to claim 1, characterized in that: The commutation device is an electromagnetic commutation device.

11. The hydraulic cylinder according to any one of claims 2 to 4, characterized in that: The reversing device comprises an electromagnetic coil accommodated in the annular accommodating cavity, the switching member is made of magnetic material, and the electromagnetic coil is used to drive the switching member to reciprocate in the annular accommodating cavity.

12. The hydraulic cylinder according to claim 1, characterized in that: The hydraulic cylinder is a bidirectional hydraulic cylinder, and the piston rod comprises a first piston rod and a second piston rod connected to both sides of the piston.

13. The hydraulic cylinder according to claim 1 or 12, characterized in that: The hydraulic cylinder is a steering hydraulic cylinder and is used for vehicles.

14. A hydraulic system for a vehicle, characterized in that: include: Hydraulic pump, and The steering hydraulic cylinder is a hydraulic cylinder according to any one of claims 1 to 13, which is connected to the hydraulic pump and is used to drive the wheels of the vehicle to rotate.

15. The hydraulic system according to claim 14, characterized in that The steering hydraulic cylinder is a bidirectional hydraulic cylinder and includes a first hydraulic cylinder and a second hydraulic cylinder, wherein the first hydraulic cylinder is used to drive the two front wheels of the vehicle, and the second hydraulic cylinder is used to drive the two rear wheels of the vehicle.

16. The hydraulic system according to claim 14 or 15, characterized in that: The hydraulic pump is constructed as a bidirectional hydraulic pump, and its two working oil ports are connected to the working oil ports of the hydraulic cylinder through a first main oil circuit and a second main oil circuit respectively, and both the first main oil circuit and the second main oil circuit are connected to accumulators.

17. The hydraulic system according to claim 16, characterized in that The hydraulic system further comprises a hydraulic brake circuit and a hydraulic suspension circuit, wherein the hydraulic brake circuit and the hydraulic suspension circuit are respectively connected in parallel to the first main oil circuit and the second main oil circuit.

18. A vehicle, characterized in that: It comprises the hydraulic cylinder as claimed in any one of claims 1 to 13 and / or the hydraulic system as claimed in any one of claims 14 to 17.

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