Hydraulic steering mechanism and steering system

Abstract

The utility model provides a hydraulic steering mechanism and a steering system, and relates to the technical field of hydraulic steering. The hydraulic steering mechanism comprises a base, a rotary driving piece, a reversing valve, a hydraulic cylinder and a linkage assembly. The rotary driving piece is arranged on the base and provided with a rotary driving end; the reversing valve comprises a valve body and a valve element, the valve body is rotationally arranged on the base, an oil inlet, an oil return opening, a first port and a second port are formed in the valve body, the valve element is connected to the rotary driving end, and a first oil channel and a second oil channel are formed in the valve element; the hydraulic cylinder is arranged on the base, the hydraulic cylinder is provided with a linear driving end, and the hydraulic cylinder is provided with a third port communicated with the first port and a fourth port communicated with the second port; the linkage assembly is connected to the valve body and the linear driving end. The moving distance of the linear driving end depends on the rotating angle of the valve element, so that accurate control over the movement of the hydraulic cylinder is achieved, interference of the external environment is avoided, stability is high, and reliable running of a vehicle in the severe environment is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic steering, in particular to a hydraulic steering mechanism and a steering system. Background Art

[0002] Hydraulic steering is one of the steering methods of vehicles, which mainly uses hydraulic cylinders to complete the steering action. There are two traditional ways to control the movement of hydraulic cylinders.

[0003] The first is to control the movement of the hydraulic cylinder through a common hydraulic distribution valve, specifically by switching the oil circuit of the valve to control the movement of the hydraulic cylinder. Therefore, when the hydraulic cylinder needs to move in the opposite direction, it needs to be turned in the opposite direction, and the position is inaccurate and cannot be accurately controlled.

[0004] The second method is to add an angle position electronic feedback system to the structure of the first method, use an angle position sensor to connect the vehicle steering knuckle, and control the hydraulic distribution valve after the electronic system feedbacks the position, thereby accurately controlling the movement of the hydraulic cylinder. However, the electronic feedback control method of the hydraulic cylinder has poor stability in harsh working environments, making it difficult for the vehicle to drive reliably in harsh environments. Utility Model Content

[0005] In order to solve the problems existing in the prior art, one of the purposes of the utility model is to provide a hydraulic steering mechanism.

[0006] The utility model provides the following technical solutions:

[0007] A hydraulic steering mechanism, comprising:

[0008] Base;

[0009] A rotary driving member, disposed on the base, wherein the rotary driving member has a rotary driving end;

[0010] A reversing valve, comprising a valve body and a valve core, wherein the valve body is rotatably arranged on the base around the rotation axis of the rotation drive end, the valve body is provided with an oil inlet, an oil return port, a first port and a second port, the valve core is connected to the rotation drive end, and the valve core is provided with a first oil passage and a second oil passage around the rotation axis;

[0011] a hydraulic cylinder disposed on the base, the hydraulic cylinder having a linear drive end, the hydraulic cylinder being provided with a third port connected to the first port and a fourth port connected to the second port; and

[0012] A linkage assembly, connected to the valve body and the linear drive end respectively, and the linkage assembly is used to drive the valve body to rotate under the drive of the linear drive end;

[0013] Wherein, the rotary driving end is used to drive the valve core to rotate a preset angle so that the oil inlet is connected to one of the first port and the second port through one of the first oil channel and the second oil channel, and the oil return port is connected to the other of the first port and the second port through the other of the first oil channel and the second oil channel.

[0014] As a further optional solution to the hydraulic steering mechanism, the linkage assembly includes a linkage tie rod and a swing arm;

[0015] The linkage rod is connected to the linear drive end, and a sliding portion is provided on the linkage rod;

[0016] The swing arm is connected to the valve body, and a slide groove is provided on the swing arm to slide with the sliding part, and the slide groove extends in a direction perpendicular to the rotation axis.

[0017] As a further optional solution for the hydraulic steering mechanism, a first mounting seat is provided on the base, the hydraulic cylinder is provided on the first mounting seat, and the linkage rod is slidably provided through the first mounting seat.

[0018] As a further optional solution for the hydraulic steering mechanism, the valve body has a first abutting surface abutting against the valve core in a direction parallel to the rotation axis, and a first oil port, a second oil port, a third oil port and a fourth oil port are arranged on the first abutting surface, and the first oil port, the second oil port, the third oil port and the fourth oil port are arranged in sequence around the rotation axis, the first oil port is communicated with the oil inlet, the second oil port is communicated with the first port, the third oil port is communicated with the oil return port, and the fourth oil port is communicated with the second port;

[0019] The valve core has a second abutting surface abutting against the first abutting surface in a direction parallel to the rotation axis, and the first oil passage and the second oil passage are provided on the second abutting surface.

[0020] As a further optional solution for the hydraulic steering mechanism, a valve cover is provided on the valve body, and the valve cover is buckled on the valve core in a direction parallel to the rotation axis so that the first abutting surface abuts against the second abutting surface.

[0021] As a further optional solution to the hydraulic steering mechanism, the valve core includes a head portion and a stem portion;

[0022] The end of the head portion away from the stem portion has the second abutting surface, and the valve cover is buckled and pressed on the head portion;

[0023] The rod portion is inserted through the valve cover and rotatably cooperates with the valve cover. One end of the rod portion away from the head portion is connected to a transmission portion, and the transmission portion is connected to the rotation drive end.

[0024] As a further optional solution for the hydraulic steering mechanism, a first sealing ring is arranged between the valve cover and the head, and a second sealing ring is arranged between the valve cover and the valve body.

[0025] As a further optional solution for the hydraulic steering mechanism, a second mounting seat is provided on the base, and the rotary drive member is provided on the second mounting seat.

[0026] As a further optional solution for the hydraulic steering mechanism, a third mounting seat is arranged on the second mounting seat, and the valve body is rotatably arranged on the third mounting seat.

[0027] Another object of the utility model is to provide a steering system.

[0028] The utility model provides the following technical solutions:

[0029] A steering system comprises a steering knuckle and the above-mentioned hydraulic steering mechanism, wherein the steering knuckle is rotatably connected to the linear drive end.

[0030] The embodiments of the present invention have the following beneficial effects:

[0031] When the above hydraulic steering mechanism is working, the rotary drive end of the rotary drive member drives the valve core to rotate by a preset angle, so that the oil inlet is connected to one of the first port and the second port through one of the first oil channel and the second oil channel, and the oil return port is connected to the other of the first port and the second port through the other of the first oil channel and the second oil channel. At this time, the hydraulic oil flows into the third port of the hydraulic cylinder through the first port and flows back to the second port from the fourth port of the hydraulic cylinder, or the hydraulic oil flows into the fourth port of the hydraulic cylinder through the second port and flows back to the first port from the third port of the hydraulic cylinder, and in this process pushes the piston of the hydraulic cylinder, thereby driving the linear drive end of the hydraulic cylinder to perform linear motion and perform steering action. In the process of the linear drive end performing linear motion, the linear drive end simultaneously drives the linkage assembly to drive the valve body to rotate until the oil inlet or one of the first port and the second port is no longer connected to the first oil channel and the second oil channel, the hydraulic oil cannot reach the hydraulic cylinder, the linear drive end of the hydraulic cylinder stops moving, and the steering action ends. Therefore, the distance of movement of the linear drive end depends on the angle of rotation of the valve core, thereby achieving precise control of the movement of the hydraulic cylinder without being disturbed by the external environment, with high stability, which is conducive to reliable driving of the vehicle in harsh environments.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The overall structural diagram of a hydraulic steering mechanism provided by an embodiment of the utility model is shown;

[0035] Figure 2 A schematic diagram showing the connection relationship between a rotary drive member, a reversing valve and a hydraulic cylinder in a hydraulic steering mechanism provided by an embodiment of the utility model is shown;

[0036] Figure 3 A schematic diagram showing the connection relationship between a rotary drive member, a reversing valve and a hydraulic cylinder in a hydraulic steering mechanism provided by another embodiment of the utility model is shown;

[0037] Figure 4 A schematic diagram showing the structure of a valve body in a hydraulic steering mechanism provided by an embodiment of the utility model is shown;

[0038] Figure 5 A cross-sectional schematic diagram of a reversing valve in a hydraulic steering mechanism provided by an embodiment of the utility model is shown;

[0039] Figure 6 A schematic diagram showing the connection relationship between a base, a rotary drive member and a reversing valve in a hydraulic steering mechanism provided by an embodiment of the utility model is shown;

[0040] Figure 7 A schematic diagram showing the connection relationship between a base, a hydraulic cylinder and a linkage assembly in a hydraulic steering mechanism provided by an embodiment of the utility model is shown;

[0041] Figure 8 The figure shows an overall structural diagram of a hydraulic system provided by an embodiment of the utility model.

[0042] Description of main component symbols:

[0043] 10-hydraulic steering mechanism; 20-steering knuckle; 100-base; 110-first mounting seat; 120-second mounting seat; 130-third mounting seat; 131-first mounting portion; 132-second mounting portion; 200-rotational drive member; 210-rotational drive end; 300-reversing valve; 310-valve body; 311-oil inlet; 312-oil return port; 313-first port; 314-second port; 315-first abutting surface; 315a-first oil port; 315b-second oil port; 315c-third oil port; 315d -fourth oil port; 316-groove; 320-valve core; 321-first oil channel; 322-second oil channel; 323-second abutting surface; 324-head; 325-rod; 326-transmission part; 330-valve cover; 331-first sealing ring; 332-second sealing ring; 400-hydraulic cylinder; 410-linear drive end; 420-third port; 430-fourth port; 500-linkage assembly; 510-linkage rod; 511-sliding part; 520-swing arm; 521-slide groove; 530-connecting arm; Y-rotation axis. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0049] Example

[0050] Please also read Figure 1 and Figure 2 The present embodiment provides a hydraulic steering mechanism 10, specifically a hydraulic return-to-center steering mechanism, including a base 100, a rotary drive member 200, a reversing valve 300, a hydraulic cylinder 400 and a linkage assembly 500.

[0051] Specifically, the rotary driving member 200 is disposed on the base 100 , and the rotary driving member 200 has a rotary driving end 210 .

[0052] The reversing valve 300 includes a valve body 310 and a valve core 320. The valve body 310 is rotatably arranged on the base 100 around the rotation axis Y of the rotation drive end 210, and the valve body 310 is provided with an oil inlet 311, an oil return port 312, a first port 313 and a second port 314. The valve core 320 is connected to the rotation drive end 210, and the valve core 320 is provided with a first oil passage 321 and a second oil passage 322 around the rotation axis Y.

[0053] The hydraulic cylinder 400 is disposed on the base 100 . The hydraulic cylinder 400 has a linear driving end 410 . The hydraulic cylinder 400 is provided with a third port 420 connected to the first port 313 and a fourth port 430 connected to the second port 314 .

[0054] The linkage assembly 500 is connected to the valve body 310 and the linear drive end 410 , respectively. The linkage assembly 500 is used to drive the valve body 310 to rotate under the driving of the linear drive end 410 .

[0055] When the hydraulic steering mechanism 10 is working, the rotary driving end 210 of the rotary driving member 200 drives the valve core 320 to rotate by a preset angle, so that the oil inlet 311 is connected to one of the first port 313 and the second port 314 through one of the first oil passage 321 and the second oil passage 322, and the oil return port 312 is connected to the other of the first port 313 and the second port 314 through the other of the first oil passage 321 and the second oil passage 322. At this time, the hydraulic oil flows into the third port 420 of the hydraulic cylinder 400 through the first port 313 and flows back to the second port 314 from the fourth port 430 of the hydraulic cylinder 400, or the hydraulic oil flows into the fourth port 430 of the hydraulic cylinder 400 through the second port 314 and flows back to the first port 313 from the third port 420 of the hydraulic cylinder 400, and in this process, the piston of the hydraulic cylinder 400 is pushed, thereby driving the linear driving end 410 of the hydraulic cylinder 400 to perform linear motion to perform steering action.

[0056] When the linear drive end 410 makes linear motion, the linear drive end 410 simultaneously drives the linkage assembly 500 to drive the valve body 310 to rotate until the oil inlet 311 or one of the first port 313 and the second port 314 is not connected with the first oil channel 321 and the second oil channel 322, and the hydraulic oil cannot reach the hydraulic cylinder 400, and the linear drive end 410 of the hydraulic cylinder 400 stops moving, ending the steering action.

[0057] Therefore, the movement distance of the linear drive end 410 depends on the rotation angle of the valve core 320, thereby achieving precise control of the movement of the hydraulic cylinder 400 without being disturbed by the external environment, with high stability, which is conducive to reliable driving of the vehicle in harsh environments.

[0058] by Figure 2 Taking the perspective shown as an example, in the initial state, the oil inlet 311 and the oil return port 312 are not connected to the first oil passage 321 and the second oil passage 322 , the first port 313 is connected to the first oil passage 321 , and the second port 314 is connected to the second oil passage 322 .

[0059] On this basis, the rotary drive end 210 drives the valve core 320 to rotate counterclockwise by a preset angle, so that the oil inlet 311 is connected to the first oil channel 321, and then connected to the first port 313 through the first oil channel 321, and the oil return port 312 is connected to the second port 314 through the second oil channel 322. At this time, the hydraulic oil flows into the third port 420 of the hydraulic cylinder 400 through the first port 313, and flows back to the second port 314 from the fourth port 430 of the hydraulic cylinder 400. In this process, the hydraulic oil pushes the piston of the hydraulic cylinder 400, so that the piston moves forward in the X direction, and then drives the linear drive end 410 of the hydraulic cylinder 400 to move linearly in the X direction to perform a steering action. Among them, the X direction is perpendicular to the rotation axis Y of the rotary drive end 210.

[0060] When the linear drive end 410 performs linear motion in the positive direction along the X direction, the linear drive end 410 simultaneously drives the linkage assembly 500 to drive the valve body 310 to rotate in the clockwise direction until the first port 313 is no longer connected to the first oil passage 321 and the second port 314 is no longer connected to the second oil passage 322, the hydraulic oil cannot reach the hydraulic cylinder 400, the piston of the hydraulic cylinder 400 and the linear drive end 410 stop moving, and the steering action ends.

[0061] Alternatively, on this basis, the rotary drive end 210 drives the valve core 320 to rotate in the clockwise direction by a preset angle, so that the oil inlet 311 is connected to the second oil passage 322, and then connected to the second port 314 through the second oil passage 322, and the oil return port 312 is connected to the first port 313 through the first oil passage 321. At this time, the hydraulic oil flows into the fourth port 430 of the hydraulic cylinder 400 through the second port 314, and flows back to the first port 313 from the third port 420 of the hydraulic cylinder 400. In this process, the hydraulic oil pushes the piston of the hydraulic cylinder 400, so that the piston moves in the opposite direction along the X direction, and then drives the linear drive end 410 of the hydraulic cylinder 400 to make a linear motion in the opposite direction along the X direction to perform a steering action.

[0062] When the linear drive end 410 performs linear motion in the opposite direction along the X direction, the linear drive end 410 simultaneously drives the linkage assembly 500 to drive the valve body 310 to rotate in the counterclockwise direction until the second port 314 is no longer connected to the second oil passage 322 and the first port 313 is no longer connected to the first oil passage 321, the hydraulic oil cannot reach the hydraulic cylinder 400, the piston of the hydraulic cylinder 400 and the linear drive end 410 stop moving, and the steering action ends.

[0063] It can be understood that this embodiment only limits the third port 420 on the hydraulic cylinder 400 to be connected to the first port 313 on the valve body 310, and the fourth port 430 on the hydraulic cylinder 400 to be connected to the second port 314 on the valve body 310, but does not limit the positions of the third port 420 and the fourth port 430 on the hydraulic cylinder 400.

[0064] See also Figure 2 In some embodiments, the third port 420 and the fourth port 430 on the hydraulic cylinder 400 are arranged in a positive direction along the X direction.

[0065] See also Figure 3In other embodiments, the third port 420 and the fourth port 430 on the hydraulic cylinder 400 are arranged in opposite directions along the X direction. At this time, the rotary drive end 210 drives the valve core 320 to rotate in the counterclockwise direction by a preset angle, so that the oil inlet 311 is connected to the first oil channel 321, and then connected to the first port 313 through the first oil channel 321, and the oil return port 312 is connected to the second port 314 through the second oil channel 322. At this time, the hydraulic oil flows into the third port 420 of the hydraulic cylinder 400 through the first port 313, and flows back to the second port 314 from the fourth port 430 of the hydraulic cylinder 400. In this process, the hydraulic oil pushes the piston of the hydraulic cylinder 400, causing the piston to move in the opposite direction along the X direction, thereby driving the linear drive end 410 of the hydraulic cylinder 400 to make a linear motion in the opposite direction along the X direction to perform a steering action. When the linear drive end 410 makes a linear motion in the opposite direction along the X direction, the linear drive end 410 simultaneously drives the linkage assembly 500 to drive the valve body 310 to rotate in the counterclockwise direction until the oil inlet 311 is no longer connected with the first oil passage 321 and the oil return port 312 is no longer connected with the second oil passage 322, the hydraulic oil cannot reach the hydraulic cylinder 400, the piston of the hydraulic cylinder 400 and the linear drive end 410 stop moving, and the steering action ends.

[0066] Alternatively, the rotary drive end 210 drives the valve core 320 to rotate in the clockwise direction by a preset angle, so that the oil inlet 311 is connected to the second oil passage 322, and then connected to the second port 314 through the second oil passage 322, and the oil return port 312 is connected to the first port 313 through the first oil passage 321. At this time, the hydraulic oil flows into the fourth port 430 of the hydraulic cylinder 400 through the second port 314, and flows back to the first port 313 from the third port 420 of the hydraulic cylinder 400. In this process, the hydraulic oil pushes the piston of the hydraulic cylinder 400, so that the piston moves forward in the X direction, and then drives the linear drive end 410 of the hydraulic cylinder 400 to make a linear motion in the X direction to perform a steering action. When the linear drive end 410 performs linear motion in the positive direction along the X direction, the linear drive end 410 simultaneously drives the linkage assembly 500 to drive the valve body 310 to rotate in the clockwise direction until the oil inlet 311 is no longer connected to the second oil passage 322 and the oil return port 312 is no longer connected to the first oil passage 321, the hydraulic oil cannot reach the hydraulic cylinder 400, the piston of the hydraulic cylinder 400 and the linear drive end 410 stop moving, and the steering action ends.

[0067] The hydraulic steering mechanism 10 changes the valve body 310 from being fixed to being rotatable. When the valve core 320 and the valve body 310 have a relative deflection angle, the hydraulic oil enters one side of the hydraulic cylinder 400 through the oil passage connected to the oil inlet 311, thereby driving the piston and the linear drive end 410 to move to the other side. At the same time, the valve body 310 is rotated through the linkage assembly 500, so that the valve body 310 is rotated to the initial position relative to the valve core 320. Regardless of how the position of the valve core 320 rotates, the hydraulic cylinder 400 can rotate the valve body 310 back to the initial position relative to the valve core 320 in cooperation with the linkage assembly 500. Therefore, the hydraulic steering mechanism 10 mechanically solves the problem that the ordinary reversing valve 300 controls the movement of the hydraulic cylinder 400 and cannot automatically return to the center, making the vehicle more manipulable and reducing the difficulty of the operator's operation. At the same time, compared with the method of controlling the hydraulic cylinder 400 by electronic feedback, it is more stable in harsh working environments, making the vehicle more stable and reliable during driving.

[0068] Please also read Figure 2 and Figure 4 In some embodiments, the valve body 310 has a first abutting surface 315, and the first abutting surface 315 abuts against the valve core 320 in a direction parallel to the rotation axis Y. The first abutting surface 315 is provided with a first oil port 315a, a second oil port 315b, a third oil port 315c and a fourth oil port 315d, and the first oil port 315a, the second oil port 315b, the third oil port 315c and the fourth oil port 315d are arranged in sequence around the rotation axis Y. Among them, the first oil port 315a is connected to the oil inlet 311, the second oil port 315b is connected to the first port 313, the third oil port 315c is connected to the oil return port 312, and the fourth oil port 315d is connected to the second port 314.

[0069] Correspondingly, the valve core 320 has a second abutting surface 323 , and the second abutting surface 323 abuts against the first abutting surface 315 along a direction parallel to the rotation axis Y, and the first oil passage 321 and the second oil passage 322 are disposed on the second abutting surface 323 .

[0070] by Figure 2 Taking the perspective shown as an example, in the initial state, the first oil port 315a is located between one end of the first oil channel 321 and one end of the second oil channel 322, the third oil port 315c is located between the other end of the first oil channel 321 and the other end of the second oil channel 322, the second oil port 315b is aligned with the first oil channel 321, and the fourth oil port 315d is aligned with the second oil channel 322.

[0071] On this basis, the rotary drive end 210 drives the valve core 320 to rotate in the counterclockwise direction by a preset angle, so that the first oil port 315a and the second oil port 315b are aligned with the first oil channel 321 at the same time, so that the oil inlet 311 is connected to the first port 313 through the first oil channel 321, and the third oil port 315c and the fourth oil port 315d are aligned with the second oil channel 322 at the same time, so that the oil return port 312 is connected to the second port 314 through the second oil channel 322. At this time, the hydraulic oil flows into the third port 420 of the hydraulic cylinder 400 through the first port 313, and flows back to the second port 314 from the fourth port 430 of the hydraulic cylinder 400. In this process, the hydraulic oil pushes the piston of the hydraulic cylinder 400, so that the piston moves forward in the X direction, thereby driving the linear drive end 410 of the hydraulic cylinder 400 to make a linear motion in the X direction to perform a steering action.

[0072] When the linear drive end 410 performs linear motion in the positive direction along the X direction, the linear drive end 410 simultaneously drives the linkage assembly 500 to drive the valve body 310 to rotate in the clockwise direction until the second oil port 315b is not aligned with the first oil channel 321 and the fourth oil port 315d is not aligned with the second oil channel 322, the hydraulic oil cannot reach the hydraulic cylinder 400, the piston of the hydraulic cylinder 400 and the linear drive end 410 stop moving, and the steering action ends.

[0073] Please combine Figure 5 In some embodiments, a valve cover 330 is disposed on the valve body 310. The valve cover 330 is buckled on the valve core 320 along a direction parallel to the rotation axis Y, so that the first abutting surface 315 abuts against the second abutting surface 323.

[0074] Specifically, the valve core 320 includes a head portion 324 and a stem portion 325 .

[0075] The end of the head portion 324 away from the stem portion 325 has a second abutting surface 323 , and the valve cover 330 is buckled on the head portion 324 .

[0076] Meanwhile, a groove 316 is provided on the valve body 310 , and the bottom surface of the groove 316 is the first abutting surface 315 . The head 324 is embedded in the groove 316 and rotatably cooperates with the valve body 310 .

[0077] In addition, the rod 325 is inserted into the valve cover 330 and is rotatably matched with the valve cover 330. The end of the rod 325 away from the head 324 is connected to a transmission part 326, and the transmission part 326 is connected to the rotation driving end 210.

[0078] Furthermore, a first sealing ring 331 is disposed between the valve cover 330 and the head 324 , and a second sealing ring 332 is disposed between the valve cover 330 and the valve body 310 .

[0079] When in use, the first sealing ring 331 can enhance the sealing between the valve cover 330 and the head 324 to prevent the hydraulic oil from leaking from between the valve cover 330 and the head 324. Similarly, the second sealing ring 332 can enhance the sealing between the valve cover 330 and the valve body 310 to prevent the hydraulic oil from leaking from between the valve cover 330 and the valve body 310.

[0080] See also Figure 6 In some embodiments, a second mounting seat 120 is disposed on the base 100 , and the rotary driving member 200 is disposed on the second mounting seat 120 .

[0081] Exemplarily, the rotary drive member 200 adopts a servo motor, which can accurately control the rotation angle of the valve core 320 .

[0082] Further, a third mounting seat 130 is disposed on the second mounting seat 120 , and the valve body 310 is rotatably disposed on the third mounting seat 130 .

[0083] Specifically, the third mounting seat 130 is composed of a first mounting portion 131 and a second mounting portion 132. The first mounting portion 131 is bolted and fixed to the housing of the servo motor and the second mounting seat 120, and the second mounting seat 120 is bolted and fixed to the first mounting portion 131.

[0084] The valve cover 330 is rotatably mounted on the first mounting portion 131 via a bearing, and the valve body 310 is rotatably mounted on the second mounting portion 132 via another bearing.

[0085] See also Figure 7 In some embodiments, the linkage assembly 500 includes a linkage rod 510 and a swing arm 520 .

[0086] The linkage rod 510 extends along the X direction. The linkage rod 510 is provided with connecting arms 530 at both ends along the length direction, and is connected to the linear driving end 410 through the connecting arms 530. A sliding portion 511 is provided in the middle of the linkage rod 510.

[0087] One end of the swing arm 520 is connected to the valve body 310 , and the other end of the swing arm 520 is provided with a slide groove 521 . The slide groove 521 extends in a direction perpendicular to the rotation axis Y and is slidably matched with the sliding portion 511 .

[0088] When in use, the linear driving end 410 drives the linkage rod 510 to perform linear motion along the X direction through the connecting arm 530, and the linkage rod 510 drives the swing arm 520 to swing through the sliding portion 511, thereby driving the valve body 310 to rotate around the rotation axis Y. In this process, the sliding portion 511 slides in the sliding groove 521 to adapt to the change in the distance between the sliding portion 511 and the rotation axis Y.

[0089] In some embodiments, a first mounting seat 110 is disposed on the base 100 , the hydraulic cylinder 400 is disposed on the first mounting seat 110 , and the linkage rod 510 is slidably disposed through the first mounting seat 110 .

[0090] When the linkage rod 510 performs linear motion along the X direction, the first mounting seat 110 can limit and guide the linkage rod 510 .

[0091] In summary, when the hydraulic steering mechanism 10 is working, the distance of movement of the linear drive end 410 depends on the angle of rotation of the valve core 320, thereby achieving precise control of the movement of the hydraulic cylinder 400, and is not affected by the external environment, with high stability, which is conducive to reliable driving of the vehicle in harsh environments. In addition, the hydraulic steering mechanism 10 mechanically solves the problem that the ordinary reversing valve 300 controls the movement of the hydraulic cylinder 400 and cannot automatically return to the center, making the vehicle more maneuverable and reducing the difficulty of operation for operators.

[0092] See also Figure 8 This embodiment also provides a steering system, specifically a hydraulic steering system for a vehicle or engineering machinery, and the steering system includes a steering knuckle 20 and the above-mentioned hydraulic steering mechanism 10.

[0093] The steering knuckle 20 is rotatably connected to the linear drive end 410 .

[0094] When in use, the movement of the hydraulic cylinder 400 is precisely controlled through the hydraulic steering mechanism 10, thereby precisely controlling the steering of the vehicle without being disturbed by the external environment, having high stability, and facilitating reliable driving of the vehicle in harsh environments.

[0095] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0096] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0097] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A hydraulic steering mechanism, characterized in that: include: Base; A rotary drive member, disposed on the base, wherein the rotary drive member has a rotary drive end; A reversing valve, comprising a valve body and a valve core, wherein the valve body is rotatably arranged on the base around the rotation axis of the rotation drive end, the valve body is provided with an oil inlet, an oil return port, a first port and a second port, the valve core is connected to the rotation drive end, and the valve core is provided with a first oil passage and a second oil passage around the rotation axis; A hydraulic cylinder is disposed on the base, the hydraulic cylinder has a linear drive end, and the hydraulic cylinder is provided with a third port connected to the first port and a fourth port connected to the second port; as well as A linkage assembly, connected to the valve body and the linear drive end respectively, and the linkage assembly is used to drive the valve body to rotate under the drive of the linear drive end; Wherein, the rotary driving end is used to drive the valve core to rotate a preset angle so that the oil inlet is connected to one of the first port and the second port through one of the first oil channel and the second oil channel, and the oil return port is connected to the other of the first port and the second port through the other of the first oil channel and the second oil channel.

2. The hydraulic steering mechanism according to claim 1, characterized in that: The linkage assembly includes a linkage pull rod and a swing arm; The linkage rod is connected to the linear drive end, and a sliding portion is provided on the linkage rod; The swing arm is connected to the valve body, and a slide groove is provided on the swing arm to slide with the sliding part, and the slide groove extends in a direction perpendicular to the rotation axis.

3. The hydraulic steering mechanism according to claim 2, characterized in that: A first mounting seat is arranged on the base, the hydraulic cylinder is arranged on the first mounting seat, and the linkage rod is slidably arranged through the first mounting seat.

4. The hydraulic steering mechanism according to claim 1, characterized in that: The valve body has a first abutting surface abutting against the valve core in a direction parallel to the rotation axis, and a first oil port, a second oil port, a third oil port and a fourth oil port are arranged on the first abutting surface, and the first oil port, the second oil port, the third oil port and the fourth oil port are arranged in sequence around the rotation axis, the first oil port is communicated with the oil inlet, the second oil port is communicated with the first port, the third oil port is communicated with the oil return port, and the fourth oil port is communicated with the second port; The valve core has a second abutting surface abutting against the first abutting surface in a direction parallel to the rotation axis, and the first oil passage and the second oil passage are provided on the second abutting surface.

5. The hydraulic steering mechanism according to claim 4, characterized in that: The valve body is provided with a valve cover, and the valve cover is buckled and pressed on the valve core along a direction parallel to the rotation axis, so that the first abutting surface abuts against the second abutting surface.

6. The hydraulic steering mechanism according to claim 5, characterized in that: The valve core comprises a head portion and a stem portion; The end of the head portion away from the stem portion has the second abutting surface, and the valve cover is buckled and pressed on the head portion; The rod portion is inserted through the valve cover and rotatably cooperates with the valve cover. One end of the rod portion away from the head portion is connected to a transmission portion, and the transmission portion is connected to the rotation drive end.

7. The hydraulic steering mechanism according to claim 6, characterized in that: A first sealing ring is arranged between the valve cover and the head, and a second sealing ring is arranged between the valve cover and the valve body.

8. The hydraulic steering mechanism according to any one of claims 1 to 7, characterized in that: A second mounting seat is arranged on the base, and the rotary driving member is arranged on the second mounting seat.

9. The hydraulic steering mechanism according to claim 8, characterized in that: A third mounting seat is arranged on the second mounting seat, and the valve body is rotatably arranged on the third mounting seat.

10. A steering system, characterized in that: It comprises a steering knuckle and a hydraulic steering mechanism as claimed in any one of claims 1 to 9, wherein the steering knuckle is rotatably connected to the linear drive end.

Images