Servo steering system and dumper

Abstract

The invention belongs to the technical field of vehicle steering systems, and discloses a servo steering system and a dumper. The servo steering system comprises a steering device, a transmission mechanism, an execution unit and a feedback mechanism, wherein the transmission mechanism is connected with the steering device; the execution unit comprises a pilot valve, a steering valve and a steering oil cylinder, the pilot valve is connected with the transmission mechanism, the transmission mechanism can drive a valve element of the pilot valve to move so as to convey pilot oil to the steering valve, the steering valve is used for controlling the steering oil cylinder, and the steering oil cylinder is connected with a bogie of the vehicle; the execution unit has a steering state and a balance state, when the execution unit is in the steering state, the pilot valve conveys pilot oil to the steering valve so that the steering valve can control the steering oil cylinder to act to drive the bogie to rotate, and when the execution unit is in the balance state, the pilot valve stops conveying the pilot oil to the steering valve, and the steering oil cylinder stops acting. The servo steering system is simple in structure, flexible in arrangement, low in manufacturing cost and capable of improving the driving experience of a driver.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle steering systems, and in particular to a servo steering system and a dump truck. Background Art

[0002] The steering system of a vehicle is generally composed of a steering wheel, a steering wheel rack, a servo linkage mechanism, a steering main valve, a feedback mechanism and a steering cylinder; when the vehicle needs to turn, the driver turns the steering wheel, and the steering wheel drives the steering wheel rack to move, and then controls the steering main valve through the servo linkage mechanism connected to the steering wheel rack. The steering main valve gives a signal to the steering cylinder, so that the frame turns under the drive of the steering cylinder. At the same time, the feedback mechanism will indirectly control the steering main valve through the servo linkage mechanism to stop outputting signals, and the frame maintains a fixed angle to complete the steering.

[0003] In the existing steering system, in order to achieve normal steering, the steering main valve needs to use a special control valve, and the servo linkage mechanism needs to be directly connected to the steering main valve. Therefore, the structure of the existing steering system is complex and difficult to install and arrange, and the design and manufacturing costs are high. Summary of the invention

[0004] The object of the present invention is to provide a servo steering system and a dump truck, which have a simple structure and a flexible layout and can reduce the difficulty of installing the steering system.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Servo steering system, including:

[0007] Steering device;

[0008] a transmission mechanism connected to the steering device;

[0009] an execution unit, the execution unit comprising a pilot valve, a steering valve and a steering oil cylinder, the pilot valve being connected to the transmission mechanism, the transmission mechanism being capable of driving the valve core of the pilot valve to move so as to deliver pilot oil to the steering valve, the steering valve being used to control the steering oil cylinder, and the steering oil cylinder being connected to the bogie of the vehicle;

[0010] The actuator unit has a steering state and a balanced state. When the actuator unit is in the steering state, the pilot valve delivers pilot oil to the steering valve, so that the steering valve controls the steering cylinder to drive the bogie to rotate. When the actuator unit is in the balanced state, the pilot valve stops delivering pilot oil to the steering valve, and the steering cylinder stops moving.

[0011] A feedback mechanism is provided on the bogie, the feedback mechanism can drive the execution unit to switch from the steering state to the balanced state, and the steering device can drive the execution unit to switch from the balanced state to the steering state.

[0012] Preferably, the transmission mechanism comprises a transmission connecting rod and a transmission rotating plate, the transmission rotating plate is rotatably arranged, the transmission rotating plate has a first end portion spaced apart from the rotation axis, one end of the transmission connecting rod is connected to the first end portion, and the other end of the transmission connecting rod is connected to the valve core of the pilot valve;

[0013] The transmission rotating plate is connected to the steering device, and the rotation of the steering device can drive the transmission rotating plate to rotate.

[0014] Preferably, the transmission mechanism also includes an input connecting rod, and the transmission rotating plate also has a second end spaced apart from the rotation axis, one end of the input connecting rod is connected to the second end, and the other end of the input connecting rod is connected to the steering device, and the steering device can drive the input connecting rod to move.

[0015] Preferably, the feedback mechanism is connected to the transmission rotating plate, and the feedback mechanism can drive the transmission rotating plate to rotate, so as to drive the transmission connecting rod to move.

[0016] Preferably, the feedback mechanism includes a swing plate and a connecting assembly, the swing plate is rotatably arranged, the transmission rotating plate is rotatably connected to the swing plate, the connecting assembly is connected between the swing plate and the bogie, and the connecting assembly can drive the swing plate to rotate so that the transmission rotating plate moves along the length direction of the transmission connecting rod.

[0017] Preferably, the rotation axis of the transmission rotating plate is closer to the connecting component relative to the rotation axis of the swing plate.

[0018] Preferably, the connecting assembly includes a first connecting rod, a second connecting rod and a feedback turn plate, the feedback turn plate is rotatably arranged, the feedback turn plate has a third end and a fourth end, the first connecting rod is connected to the third end and the swing plate, and the second connecting rod is connected to the fourth end and the bogie.

[0019] Preferably, the execution unit further includes an oil pump and a driving oil circuit, the oil pump is connected to the steering cylinder via the driving oil circuit, and the steering valve is arranged in the driving oil circuit.

[0020] Preferably, an oil pipeline is provided between the pilot valve and the steering valve, and the oil outlet of the pilot valve is communicated with the input port of the steering valve through the oil pipeline.

[0021] A dump truck comprises a bogie and the above-mentioned servo steering system, wherein the bogie is connected to the steering cylinder.

[0022] The beneficial effects of the present invention are:

[0023] The servo steering system provided by the present invention has a transmission mechanism connected to the steering device, a pilot valve connected to the transmission mechanism, and the pilot valve capable of delivering pilot oil to the steering valve. Therefore, when the driver turns the steering device, the steering device drives the valve core of the pilot valve to move through the transmission mechanism, so that the pilot valve can deliver pilot oil to the steering valve to achieve precise control of the steering valve. Since the steering valve can control the steering cylinder, and the steering cylinder is connected to the vehicle's bogie, after the pilot valve supplies oil to the steering valve, the steering valve can control the movement of the steering cylinder, thereby achieving rotation of the bogie. Since the servo steering system is provided with a feedback mechanism, when the driver turns the steering device to achieve rotation of the vehicle's bogie, the feedback mechanism will drive the execution unit from the steering state Switch to the balanced state, at this time the pilot valve stops supplying oil to the steering valve, and the steering valve controls the steering cylinder to stop moving, so that the bogie maintains the current angle to complete the steering; the execution unit of the servo steering system is provided with a pilot valve and a steering valve, and the pilot valve realizes precise control of the steering valve through the pilot oil, thereby realizing the steering of the entire vehicle, making it easier for the driver to steer, thereby improving the driving experience; and because of the provision of a pilot valve, the steering valve can be separated from the transmission mechanism and the feedback mechanism, greatly improving the flexibility of the entire servo steering system setting, in addition, the setting of the pilot valve also simplifies the structure of the steering valve, and the steering output function can be realized in conjunction with the pilot valve without the need to customize a special steering valve, thereby greatly reducing the design and manufacturing costs.

[0024] The dump truck provided by the present invention comprises a bogie and the above-mentioned servo steering system. The dump truck controls the steering valve by arranging a pilot valve, thereby realizing the separate arrangement of the steering valve, the transmission mechanism and the feedback mechanism, thereby improving the flexibility of the servo steering system and the vehicle layout. The steering valve is controlled by the pilot valve, which makes it more convenient and labor-saving for the driver when steering, further enhancing the driving experience and improving the driving feeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a system principle diagram of a servo steering system when the steering wheel is not rotated provided by a specific embodiment of the present invention;

[0026] Figure 2 It is a system principle diagram of a servo rotation system when the steering wheel is rotated provided by a specific embodiment of the present invention.

[0027] In the figure:

[0028] 100-Bogie;

[0029] 1-steering device; 11-steering wheel; 12-rack; 13-input turn plate;

[0030] 2-transmission mechanism; 21-transmission connecting rod; 22-transmission rotating plate; 23-input connecting rod;

[0031] 3-actuator unit; 31-pilot valve; 32-steering valve; 33-steering cylinder;

[0032] 4-feedback mechanism; 41-swing plate; 42-connection assembly; 421-first connecting rod; 422-second connecting rod; 423-feedback rotating plate;

[0033] 5-Oil pump. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figure 1 and Figure 2As shown, the present invention provides a servo steering system, which includes a steering device 1, a transmission mechanism 2, an execution unit 3 and a feedback mechanism 4. The transmission mechanism 2 is connected to the steering device 1; the execution unit 3 includes a pilot valve 31, a steering valve 32 and a steering cylinder 33. The pilot valve 31 is connected to the transmission mechanism 2. The transmission mechanism 2 can drive the valve core of the pilot valve 31 to move to deliver pilot oil to the steering valve 32. The steering valve 32 is used to control the steering cylinder 33. The steering cylinder 33 is connected to the bogie 100 of the vehicle; the execution unit 3 has a steering mechanism 4. When the actuator 3 is in the steering state, the pilot valve 31 delivers pilot oil to the steering valve 32, so that the steering valve 32 controls the steering cylinder 33 to drive the bogie 100 to rotate. When the actuator 3 is in the balanced state, the pilot valve 31 stops delivering pilot oil to the steering valve 32, and the steering cylinder 33 stops moving. The feedback mechanism 4 is arranged on the bogie 100, and the feedback mechanism 4 can drive the actuator 3 to switch from the steering state to the balanced state. The steering device 1 can drive the actuator 3 to switch from the balanced state to the steering state. In this embodiment, since the transmission mechanism 2 is connected to the steering device 1, the pilot valve 31 is connected to the transmission mechanism 2, and the pilot valve 31 can deliver pilot oil to the steering valve 32, when the driver turns the steering device 1, the steering device 1 drives the valve core of the pilot valve 31 to move through the transmission mechanism 2, so that the pilot valve 31 can deliver pilot oil to the steering valve 32 to achieve precise control of the steering valve 32; since the steering valve 32 can control the steering cylinder 33, and the steering cylinder 33 is connected to the vehicle's bogie 100, when the pilot valve 31 supplies oil to the steering valve 32, the steering valve 32 can control the steering cylinder 33 to move, thereby achieving the rotation of the bogie 100; since the servo steering system is provided with a feedback mechanism 4, when the driver turns the steering device 1 to achieve the rotation of the vehicle's bogie 100, the feedback mechanism 4 will drive the execution unit 3 from the steering The state switches to the balanced state, at which time the pilot valve 31 stops supplying oil to the steering valve 32, and the steering valve 32 controls the steering cylinder 33 to stop moving, so that the bogie 100 maintains the current angle to complete the steering; the execution unit 3 of the servo steering system is provided with a pilot valve 31 and a steering valve 32, and the pilot valve 31 realizes precise control of the steering valve 32 through the pilot oil, thereby realizing the steering of the entire vehicle, making it easier for the driver to steer, thereby improving the driving experience; and because the pilot valve 31 is provided, the steering valve 32 can be separated from the transmission mechanism 2 and the feedback mechanism 4, which greatly improves the flexibility of the setting of the entire servo steering system. In addition, the setting of the pilot valve 31 also simplifies the structure of the steering valve 32, and there is no need to specially customize a dedicated steering main valve to cooperate with the pilot valve 31 to realize the steering output function, thereby greatly reducing the design and manufacturing costs.Specifically, the steering device 1 includes a steering wheel 11, a rack 12 and an input turntable 13. The rack 12 is meshed with a gear on the shaft of the steering wheel 11. One end of the rack 12 is connected to the input turntable 13. The input turntable 13 is rotatably arranged. One end of the transmission mechanism 2 is connected to the input turntable 13. The connection points of the rack 12, the transmission mechanism 2 and the input turntable 13 are arranged at intervals. When the driver turns the steering wheel 11, the steering wheel 11 will drive the rack 12 to move, and then drive the input turntable 13 to rotate. The rotation of the input turntable 13 will drive the transmission mechanism 2 to move, and then drive the valve core of the pilot valve 31 to move. The pilot valve 31 is a commonly used auxiliary valve in the art, which is often used to control other valves. Its specific structure and working principle are not described here.

[0039] Furthermore, if Figure 1 As shown, the transmission mechanism 2 includes a transmission connecting rod 21 and a transmission rotating plate 22, the transmission rotating plate 22 is rotatably arranged, and the transmission rotating plate 22 has a first end spaced apart from the rotation axis, one end of the transmission connecting rod 21 is connected to the first end, and the other end of the transmission connecting rod 21 is connected to the valve core of the pilot valve 31; the transmission rotating plate 22 is connected to the steering device 1, and the rotation of the steering device 1 can drive the transmission rotating plate 22 to rotate. In this embodiment, the transmission rotating plate 22 is used to connect with the input rotating plate 13, and the rotation of the input rotating plate 13 can drive the transmission rotating plate 22 to rotate synchronously. The rotation of the transmission rotating plate 22 will drive the transmission connecting rod 21 connected to the first end to move, thereby changing the working state of the pilot valve 31.

[0040] Specifically, Figure 1 As shown, the transmission mechanism 2 further includes an input connecting rod 23, and the transmission rotating plate 22 also has a second end spaced apart from the rotation axis, one end of the input connecting rod 23 is connected to the second end, and the other end of the input connecting rod 23 is connected to the steering device 1, and the steering device 1 can drive the input connecting rod 23 to move. In this embodiment, the transmission rotating plate 22 is a triangular structure, and its center position is rotatably arranged on the vehicle body, and the first end and the second end are respectively close to the two vertices of the transmission rotating plate 22, and the two ends of the input connecting rod 23 are respectively connected to the second end and the input rotating plate 13 of the steering device 1, and the rotation of the input rotating plate 13 will drive the transmission rotating plate 22 to rotate through the input connecting rod 23, thereby driving the transmission connecting rod 21 to move.

[0041] Specifically, Figure 1 and Figure 2As shown, the feedback mechanism 4 is connected to the transmission rotating plate 22, and the feedback mechanism 4 can drive the transmission rotating plate 22 to rotate, so as to drive the transmission connecting rod 21 to move. In this embodiment, one end of the feedback mechanism 4 is connected to the bogie 100, and the other end is connected to the transmission rotating plate 22. When the bogie 100 is turned under the drive of the execution unit 3, the feedback mechanism 4 will drive the transmission rotating plate 22 to rotate under the drive of the bogie 100, so as to further drive the transmission connecting rod 21 to move; specifically, the rotation direction of the transmission rotating plate 22 driven by the feedback mechanism 4 is opposite to the rotation direction of the transmission rotating plate 22 driven by the input connecting rod 23 during the initial turning, and then the transmission connecting rod 21 will be driven to move in a direction different from that during the initial turning, so as to realize the smooth switching of the execution unit 3 from the turning state to the balanced state.

[0042] Specifically, Figure 2 As shown, the feedback mechanism 4 includes a swing plate 41 and a connection assembly 42. The swing plate 41 is rotatably arranged, the transmission rotating plate 22 is rotatably connected to the swing plate 41, the connection assembly 42 is connected between the swing plate 41 and the bogie 100, and the connection assembly 42 can drive the swing plate 41 to rotate so that the transmission rotating plate 22 moves along the length direction of the transmission connecting rod 21. In this embodiment, one end of the connection assembly 42 is connected to the bogie 100, and the other end is connected to the swing plate 41. The swing plate 41 is rotatably arranged on the car body, and the swing plate 41 can rotate around the connection point between it and the car body driven by the connection assembly 42; specifically, the transmission rotating plate 22 is rotatably arranged on the swing plate 41. When the swing plate 41 swings driven by the connection assembly 42, it can drive the transmission rotating plate 22 arranged thereon to move, and the moving direction of the transmission rotating plate 22 is the same as the moving direction of the transmission connecting rod 21, so that the pilot valve 31 can be controlled by the transmission connecting rod 21. It can be understood that the rotation axis of the transmission rotating plate 22 is close to the connecting component 42 relative to the rotation axis of the swing plate 41. When the connecting component 42 drives the swing plate 41 to rotate, the swing plate 41 can drive the transmission rotating plate 22 to rotate around the rotation axis of the swing plate 41, and then smoothly drive the transmission connecting rod 21 to move in the opposite direction of the initial turning direction.

[0043] Specifically, Figure 1 and Figure 2As shown, the connecting assembly 42 includes a first connecting rod 421, a second connecting rod 422 and a feedback turn plate 423. The feedback turn plate 423 is rotatably arranged. The feedback turn plate 423 has a third end and a fourth end. The first connecting rod 421 is connected to the third end and the swing plate 41, and the second connecting rod 422 is connected to the fourth end and the bogie 100. In this embodiment, the feedback rotating plate 423 is a triangular structure, the feedback rotating plate 423 is rotatably arranged on the car body, and the rotation axis of the feedback rotating plate 423 is spaced apart at the third end and the fourth end. When the feedback mechanism 4 is actuated, the specific activity states of its various structures are as follows: First, the bogie 100 rotates to drive the second connecting rod 422 to move, and the second connecting rod 422 then drives the feedback rotating plate 423 to rotate around its rotation axis, thereby driving the first connecting rod 421 to move; since the first connecting rod 421 is connected to the swing plate 41, the swing plate 41 rotates under the drive of the first connecting rod 421, and synchronously drives the transmission rotating plate 22 on the swing plate 41 to rotate around the rotation axis of the swing plate 41. In this case, the transmission connecting rod 21 connected to the transmission rotating plate 22 will be driven to move, thereby ultimately achieving control of the pilot valve 31.

[0044] Furthermore, the execution unit 3 also includes an oil pump 5 and a driving oil circuit, the oil pump 5 is connected to the steering cylinder 33 through the driving oil circuit, and the steering valve 32 is arranged in the driving oil circuit. In this embodiment, the bogie 100 is driven by the steering cylinder 33 to steer, and in order to ensure the normal operation of the steering cylinder 33, the execution unit 3 is provided with an oil pump 5 to supply oil to the steering cylinder 33, the oil pump 5 is connected to the steering cylinder 33 through the driving oil circuit, and the steering valve 32 is arranged in the driving oil circuit, so as to control the flow state of the hydraulic oil in the oil pump 5, so as to realize the control of the steering cylinder 33.

[0045] Furthermore, an oil delivery pipe is provided between the pilot valve 31 and the steering valve 32, and the oil outlet of the pilot valve 31 is connected to the input port of the steering valve 32 through the oil delivery pipe. In this embodiment, the pilot valve 31 inputs pilot oil to the steering valve 32 through the oil delivery pipe, thereby realizing precise control of the steering valve 32; specifically, the oil delivery pipe is a flexible hose, and since the oil delivery pipe is provided between the pilot valve 31 and the steering valve 32, the pilot valve 31 and the steering valve 32 can be arranged separately, so that the setting position of the steering valve 32 is not restricted by other mechanisms or devices, as long as the steering valve 32 controls the action of the steering cylinder 33 through the driving oil circuit, thereby greatly improving the flexibility of the arrangement of the steering valve 32 on the vehicle.

[0046] The working process of the servo steering system provided in this embodiment is roughly as follows:

[0047] Take the vehicle turning left as an example. Figure 2As shown, the driver turns the steering wheel 11 to the left, and the steering wheel 11 drives the input turn plate 13 to rotate clockwise through the rack 12. The input connecting rod 23 moves in the first direction driven by the input turn plate 13. The movement of the input connecting rod 23 drives the transmission turn plate 22 to rotate clockwise relative to the swing plate 41, thereby causing the transmission connecting rod 21 connected to the first end to push the valve core of the pilot valve 31 in the opposite direction to the first direction; in this case, the execution unit 3 is in the steering state, the pilot valve 31 is in the left turn functional position, and the pilot oil is delivered to the steering valve 32 through the oil pipeline. The steering valve 32 supplies oil to the steering cylinder 33 through the driving oil circuit under the control of the pilot valve 31 to realize the steering of the bogie 100, thereby turning the vehicle left.

[0048] When the bogie 100 turns left under the drive of the steering cylinder 33, the second connecting rod 422 connected to the bogie 100 will be driven by the bogie 100 to move in the second direction, and the feedback rotating plate 423 rotates clockwise under the drive of the second connecting rod 422, thereby driving the first connecting rod 421 to move in the first direction, thereby pushing the swing plate 41 to swing clockwise around its rotation axis; since the transmission rotating plate 22 is arranged on the swing plate 41, when the swing plate 41 rotates clockwise, the transmission rotating plate 22 is driven by the swing plate 41 to translate in the first direction, and finally drives the transmission connecting rod 21 to move in the first direction; in this case, the valve core of the pilot valve 31 moves in the first direction under the drive of the transmission connecting rod 21, so that the pilot valve 31 disengages from the left turn functional position and stops supplying pilot oil to the steering valve 32. At this time, the execution unit 3 switches to the balanced state, and the steering cylinder 33 drives the bogie 100 to complete the steering at a fixed angle in the current stroke state.

[0049] This embodiment also provides a dump truck, which includes a bogie 100 and the above-mentioned servo steering system; the bogie 100 is connected to the steering cylinder 33 of the servo steering system; the wheels of the dump truck are arranged on the bogie 100, so the rotation of the bogie 100 can drive the vehicle to rotate, and then the entire vehicle is turned. The dump truck controls the steering valve 32 by setting a pilot valve 31, and realizes the separate arrangement of the steering valve 32, the transmission mechanism 2 and the feedback mechanism 4, thereby improving the flexibility of the servo steering system and the vehicle layout, and the steering valve 32 is controlled by the pilot valve 31, so that the driver can turn more conveniently and labor-saving, further improving the driving experience and improving the driving feeling.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Servo steering system, characterized in that, include: Steering device (1); A transmission mechanism (2), wherein the transmission mechanism (2) is connected to the steering device (1); An execution unit (3), the execution unit (3) comprising a pilot valve (31), a steering valve (32) and a steering oil cylinder (33), the pilot valve (31) being connected to the transmission mechanism (2), the transmission mechanism (2) being capable of driving the valve core of the pilot valve (31) to move so as to deliver pilot oil to the steering valve (32), the steering valve (32) being used to control the steering oil cylinder (33), and the steering oil cylinder (33) being connected to a bogie (100) of a vehicle; The actuator (3) has a steering state and a balanced state. When the actuator (3) is in the steering state, the pilot valve (31) delivers pilot oil to the steering valve (32) so that the steering valve (32) controls the steering cylinder (33) to operate to drive the bogie (100) to rotate. When the actuator (3) is in the balanced state, the pilot valve (31) stops delivering pilot oil to the steering valve (32) and the steering cylinder (33) stops operating. A feedback mechanism (4), wherein the feedback mechanism (4) is arranged on the bogie (100), and the feedback mechanism (4) can drive the actuator unit (3) to switch from the steering state to the balanced state, and the steering device (1) can drive the actuator unit (3) to switch from the balanced state to the steering state.

2. The servo steering system according to claim 1, characterized in that: The transmission mechanism (2) comprises a transmission connecting rod (21) and a transmission rotating plate (22), wherein the transmission rotating plate (22) is rotatably arranged, and the transmission rotating plate (22) has a first end portion spaced apart from a rotation axis, one end of the transmission connecting rod (21) is connected to the first end portion, and the other end of the transmission connecting rod (21) is connected to a valve core of the pilot valve (31); The transmission rotating plate (22) is connected to the steering device (1), and the rotation of the steering device (1) can drive the transmission rotating plate (22) to rotate.

3. The servo steering system according to claim 2, characterized in that: The transmission mechanism (2) further comprises an input connecting rod (23); the transmission rotating plate (22) further comprises a second end portion spaced apart from the rotation axis; one end of the input connecting rod (23) is connected to the second end portion; the other end of the input connecting rod (23) is connected to the steering device (1); and the steering device (1) is capable of driving the input connecting rod (23) to move.

4. The servo steering system according to claim 2, characterized in that: The feedback mechanism (4) is connected to the transmission rotating plate (22), and the feedback mechanism (4) can drive the transmission rotating plate (22) to rotate, thereby driving the transmission connecting rod (21) to move.

5. The servo steering system according to claim 4, characterized in that: The feedback mechanism (4) comprises a swing plate (41) and a connecting assembly (42); the swing plate (41) is rotatably arranged; the transmission rotating plate (22) is rotatably connected to the swing plate (41); the connecting assembly (42) is connected between the swing plate (41) and the bogie (100); the connecting assembly (42) can drive the swing plate (41) to rotate so that the transmission rotating plate (22) moves along the length direction of the transmission connecting rod (21).

6. The servo steering system according to claim 5, characterized in that: The rotation axis of the transmission rotating plate (22) is close to the connection assembly (42) relative to the rotation axis of the swing plate (41).

7. The servo steering system according to claim 6, characterized in that: The connecting assembly (42) includes a first connecting rod (421), a second connecting rod (422) and a feedback turn plate (423), wherein the feedback turn plate (423) is rotatably arranged, and the feedback turn plate (423) has a third end and a fourth end, the first connecting rod (421) is connected to the third end and the swing plate (41), and the second connecting rod (422) is connected to the fourth end and the bogie (100).

8. The servo steering system according to claim 1, characterized in that: The execution unit (3) further comprises an oil pump (5) and a driving oil circuit, the oil pump (5) being connected to the steering cylinder (33) via the driving oil circuit, and the steering valve (32) being arranged in the driving oil circuit.

9. The servo steering system according to claim 1, characterized in that: An oil delivery pipe is provided between the pilot valve (31) and the steering valve (32), and the oil outlet of the pilot valve (31) is connected to the input port of the steering valve (32) through the oil delivery pipe.

10. A dump truck, characterized in that: It comprises a bogie (100) and the servo steering system according to any one of claims 1 to 9, wherein the bogie (100) is connected to the steering cylinder (33).

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