Steering valve group and system for tractor and tractor

Abstract

The utility model relates to a steering valve group and system for tractor and tractor, including pump oil structure, electronic control steering valve group, steering gear and steering cylinder, the pump oil structure is communicated with the electronic control steering valve group through pipeline, the steering gear is connected with the steering column of steering wheel, the steering cylinder is connected with the steering shaft of vehicle body wheel, and the steering cylinder is connected with the steering shaft of vehicle body wheel. And the electric control steering valve group is respectively communicated with the steering gear and the steering cylinder through pipelines. The electric control steering valve set and the steering gear are connected and matched with each other, pressure oil pumped out by the oil pumping structure is subjected to opening and closing selection according to different working condition requirements, and therefore the steering cylinder is controlled to move leftwards or rightwards in a manual mode or an unmanned mode, and the tractor is controlled to turn rightwards or leftwards.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor steering valve groups, in particular to a steering valve group for a tractor, a system and a tractor. Background Art

[0002] With the promotion of agricultural modernization, the modernization of machinery as a development focus has attracted more and more attention.

[0003] Among them, tractors have made many exploratory attempts to achieve unmanned control methods. The outstanding advantages of unmanned operation are not only that it can realize mechanical operations in all weather, all areas, and all time, but more importantly, it is the outstanding manifestation of human wisdom in the development of machinery, saving manpower and truly reflecting the upgrade of modern management methods.

[0004] Unmanned driving can realize operations in all stages from warehousing, transportation, operation, and returning to the site, while taking into account the authority settings of manned and unmanned driving, making the operation of the entire machine more adaptable.

[0005] In response to this demand, a steering control hydraulic system for unmanned aircraft has been developed that can meet the needs of both manned and unmanned operating modes to meet the needs of different working conditions. Utility Model Content

[0006] In order to solve the above technical problems, the purpose of the utility model is to provide a steering valve group, system and tractor for a tractor that can realize two operating modes, manned operation and unmanned operation, to meet the needs of different working conditions.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a steering valve group for a tractor, comprising an oil pump structure, an electronically controlled steering valve group, a steering gear and a steering cylinder, the oil pump structure is connected to the electronically controlled steering valve group through a pipeline, the steering gear is connected to the steering column of the steering wheel, the steering cylinder is connected to the steering shaft of the vehicle body wheels, and the electronically controlled steering valve group is respectively connected to the steering gear and the steering cylinder through pipelines.

[0008] The beneficial effect of the utility model is that the electronically controlled steering valve group and the steering gear are connected and coordinated with each other, and the pressure oil pumped out by the oil pump structure is opened and closed according to different working conditions, so that the steering cylinder can be controlled to move left or right in the manual mode or the unmanned mode, thereby controlling the tractor to turn right or left.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Further, the electrically-controlled steering valve group includes a main valve stem, a mode solenoid valve, a right steering solenoid valve, a left steering solenoid valve and a steering valve stem; the outlet of the oil pump structure is respectively connected to the inlet of the main valve stem, the inlet of the left steering solenoid valve, the inlet of the right steering solenoid valve and the inlet of the mode solenoid valve; the inlet of the oil pump structure is connected to the outlet of the main valve stem; the outlets of the left steering solenoid valve and the right steering solenoid valve are respectively connected to the inlet of the steering valve stem; the inlet and outlet of the steering valve stem are respectively connected to the outlet and inlet of the main valve stem; the mode solenoid valve is used to control the on-off of the circuit of the electrically-controlled steering valve group; the right steering solenoid valve and the left steering solenoid valve are used to control the steering valve stem; the outlet of the main valve stem is respectively connected to the inlet of the steering gear and the steering cylinder.

[0011] The above technical solution sets up an electronically controlled steering valve group so that after the pressurized oil enters the electronically controlled steering valve group, it controls the energized state of the internal right steering solenoid valve and the left steering solenoid valve, thereby controlling the direction of the oil, and ultimately affecting the left or right movement of the steering cylinder.

[0012] Furthermore, the electrically controlled steering valve group also includes a first pressure-limiting valve, the liquid inlet and liquid outlet of the first pressure-limiting valve are respectively connected to the liquid outlet and liquid return port of the oil pump structure, and the first pressure-limiting valve is used to adjust the oil pressure of the oil flowing out of the oil pump structure.

[0013] The above technical solution avoids the problem of leakage of the steering valve group due to excessively high oil pressure or steering failure due to excessively low oil pressure by providing the first pressure-limiting valve.

[0014] Furthermore, the liquid inlet and the liquid outlet of the steering cylinder are respectively connected to the liquid outlet and the liquid inlet of the main valve stem.

[0015] The above technical solution connects the steering cylinder with the main valve stem, so that when the device turns left or right in unmanned mode, the oil can directly enter the steering cylinder and flow back into the main valve stem to complete the electronic steering operation.

[0016] Furthermore, the steering gear includes a main valve core and a flow metering motor, the liquid inlet of the main valve core is respectively connected to the liquid outlet of the main valve stem and the liquid outlet of the steering cylinder, the liquid outlet of the main valve core is respectively connected to the liquid inlet of the oil pump structure and the liquid inlet of the steering cylinder, the liquid inlet and liquid outlet of the flow metering motor are respectively connected to the liquid outlet and liquid inlet of the main valve core, and the flow metering motor and the main valve core are respectively connected to the steering column of the external steering wheel.

[0017] The above technical solution provides a steering gear, connects the steering gear to the steering column of the external steering wheel and connects it to the electronically controlled steering valve group, so that the steering gear can meet both manual control and electronic control modes.

[0018] Furthermore, the steering gear also includes a second pressure-limiting valve, the liquid inlet and liquid outlet of the second pressure-limiting valve are respectively connected to the liquid outlet and liquid inlet of the main valve core, and the second pressure-limiting valve is used to adjust the oil pressure of the oil flowing out of the electronically controlled steering valve group.

[0019] The above technical solution improves the safety and stability of the steering gear by providing a second pressure-limiting valve and using it to adjust the oil pressure of the oil flowing out of the electronically controlled steering valve group 3.

[0020] Furthermore, the oil pump structure includes an oil pump and an oil tank, the liquid inlet of the oil pump is connected to the liquid outlet of the oil tank, the return liquid port of the oil tank is respectively connected to the liquid outlet of the main valve core and the liquid outlet of the main valve stem, and the liquid outlet of the oil pump is respectively connected to the liquid inlet of the main valve stem, the liquid inlet of the left steering solenoid valve, the liquid inlet of the right steering solenoid valve and the liquid inlet of the mode solenoid valve.

[0021] The above technical solution sets up oil pumps and utilizes the oil pumps to cooperate with each other, so that the oil can build up pressure before entering the steering valve group.

[0022] Furthermore, the oil pump structure also includes an oil suction filter, the liquid inlet of the oil pump is connected to the liquid outlet of the oil suction filter, and the liquid inlet of the oil suction filter is connected to the liquid outlet of the oil tank.

[0023] The above technical solution provides an oil suction filter so that the oil pump filters the pressure oil before absorbing the pressure oil, thereby preventing impurities in the pressure oil from entering the valve group and the oil pump and causing damage.

[0024] The second purpose of the utility model is to provide a tractor steering system that can be operated by humans or controlled by humans.

[0025] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a tractor steering system includes a tractor steering valve group.

[0026] The above technical solution can improve the steering system of the tractor by assembling the tractor steering valve group in the steering system of the tractor.

[0027] The third object of the utility model is to provide a tractor that can be operated by humans or controlled by humans.

[0028] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a tractor includes a steering valve group for the tractor.

[0029] The above technical solution enables the tractor to realize the functions of automatic driving steering and manual driving steering by assembling the tractor steering system in the tractor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the initial state in the embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of a human-controlled left turn in an embodiment of the present utility model;

[0032] Figure 3 It is a schematic diagram of an unmanned electric left turn in an embodiment of the utility model.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Oil suction filter; 2. Oil pump; 3. Electronically controlled steering valve group; 3.1. Main valve stem; 3.2. Mode solenoid valve; 3.3. Right steering solenoid valve; 3.4. Left steering solenoid valve; 3.5. Steering valve stem; 3.6. First pressure limiting valve; 4. Steering gear; 4.1. Main valve core; 4.2. Flow metering motor; 5. Steering cylinder. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Example

[0037] like Figure 1-3 As shown, a steering valve group for a tractor includes an oil pump structure, an electric-controlled steering valve group 3, a steering gear 4 and a steering cylinder 5. The oil pump structure is connected to the electric-controlled steering valve group 3 through a pipeline, the steering gear 4 is connected to the steering column of the steering wheel, the steering cylinder 5 is connected to the steering shaft of the vehicle body wheel, and the electric-controlled steering valve group 3 is respectively connected to the steering gear 4 and the steering cylinder 5 through pipelines;

[0038] In the unmanned operation mode, when electric steering is required, the oil enters the electric steering valve group 3 under the drive of the oil pump structure, and then the electric steering valve group 3 is energized, the electric steering valve group 3 is connected to the circuit, and the electric steering valve group 3 is connected to the oil pump structure. Under electric control, the electric steering valve group 3 is controlled to select left steering or right steering, and then the oil flows to the oil circuit corresponding to the steering gear 4, and flows into the steering cylinder 5, driving the steering cylinder 5 to move, so as to achieve the purpose of automatic steering of the vehicle;

[0039] Or in the manned operation mode, when manual steering is required, the electronically controlled steering valve group 3 is not energized, the electronically controlled steering valve group 3 is disconnected from the circuit, the electronically controlled steering valve group 3 is connected to the non-oil pumping structure, and the oil enters the steering gear 4 under the drive of the oil pumping structure. The steering gear 4 is manually controlled to allow the oil to enter the steering cylinder 5 to realize the steering of the vehicle.

[0040] The working principle is: in the unmanned operation mode, as shown in the attached manual Figure 3 As shown, when a left turn is required, the automatic steering mode is turned on, and the oil is sucked by the oil pump structure, passes through the oil pump structure, enters the electric control steering valve group 3 from the PO port, and flows out from the L0 port of the electric control steering valve group 3 after electronic control guidance, and finally flows into the L3 port of the steering cylinder 5 accordingly, and the steering cylinder 5 moves right accordingly to make the vehicle turn left in the unmanned mode, and then flows back from the R3 port of the steering cylinder 5 into the R0 port of the electric control steering valve group 3, and flows back to the oil pump structure at the T0 port of the electric control steering valve group 3;

[0041] In the unmanned operation mode, when a right turn is required, the automatic steering mode is turned on, and the oil is sucked by the oil pump structure, passes through the oil pump structure, enters the electric control steering valve group 3 from the PO port, and flows out from the R0 port of the electric control steering valve group 3 after the electric control guidance, and finally flows into the R3 port of the steering cylinder 5 accordingly, and the steering cylinder 5 moves left accordingly to turn the vehicle right in the unmanned mode, and then flows back from the L3 port of the steering cylinder 5 into the L0 port of the electric control steering valve group 3, and flows back to the oil pump structure at the T0 port of the electric control steering valve group 3;

[0042] In manned operation mode, when you need to turn left, as shown in the attached manual Figure 2 As shown, the oil is sucked by the oil pump structure, enters the electric steering valve group 3 from the PO port through the oil pump structure, and flows out from the P1 port of the electric steering valve group 3, and flows into the P2 port of the steering gear 4 accordingly. After the steering gear 4 is manually operated, the pressure oil flows out from the L2 port of the steering gear 4, enters the L1 port of the electric steering valve group 3, enters the L1 port of the electric steering valve group 3, flows out from the L0 port of the electric steering valve group 3, and finally enters the L3 port of the steering cylinder 5. The steering cylinder 5 moves right accordingly to make the vehicle turn left in the manned mode, and then flows back from the R3 port of the steering cylinder 5 into the R0 port of the electric steering valve group 3, and flows back to the oil pump structure at the T0 port of the electric steering valve group 3;

[0043] In the manned operation mode, when right steering is required, the oil is sucked by the oil pump structure, passes through the oil pump structure from the PO port into the electric control steering valve group 3, and flows out from the P1 port of the electric control steering valve group 3, and flows into the P2 port of the steering gear 4 accordingly. After the steering gear 4 is manually operated, the pressure oil flows out from the R2 port of the steering gear 4, enters the R1 port of the electric control steering valve group 3, enters the R1 port of the electric control steering valve group 3, flows out from the R0 port of the electric control steering valve group 3, and finally enters the R3 port of the steering cylinder 5. The steering cylinder 5 moves left accordingly to turn right for the vehicle in the manned mode, and then flows back from the L3 port of the steering cylinder 5 into the L0 port of the electric control steering valve group 3, and flows back to the oil pump structure at the T0 port of the electric control steering valve group 3;

[0044] In the initial state, as shown in the instruction manual Figure 1 As shown, the oil is transported to the P0 port of the electric control steering valve group 3 through the oil pump structure. After passing through the electric control steering valve group 3, the oil is transported to the P2 port of the steering gear 4 through the P1 port. The oil flows back to the T0 port of the electric control valve group through the T2 port of the steering gear 4, and then returns to the oil tank through the T0 port.

[0045] The above technical solution can connect and cooperate with the steering gear 4 through the electronically controlled steering valve group 3, and the pressure oil pumped out by the oil pump structure can be opened and closed according to different working conditions, so as to control the steering cylinder 5 to move left or right in manual mode or unmanned mode, thereby controlling the tractor to turn right or left.

[0046] Preferably, the electric-controlled steering valve group 3 comprises a main valve stem 3.1, a mode solenoid valve 3.2, a right steering solenoid valve 3.3, a left steering solenoid valve 3.4 and a steering valve stem 3.5, the liquid outlet of the pump oil structure is respectively connected to the liquid inlet of the main valve stem 3.1, the liquid inlet of the left steering solenoid valve 3.4, the liquid inlet of the right steering solenoid valve 3.3 and the liquid inlet of the mode solenoid valve 3.2, the liquid inlet of the pump oil structure is connected to the liquid outlet of the main valve stem 3.1, the left steering solenoid valve 3.4 and the right steering solenoid valve 3.5. The liquid outlets of valve 3.3 are respectively connected to the liquid inlets of steering valve stem 3.5, the liquid inlets of steering valve stem 3.5 are connected to the liquid outlets of main valve stem 3.1, the liquid outlets of steering valve stem 3.5 are connected to the liquid inlets of main valve stem 3.1, the mode solenoid valve 3.2 is used to control the on-off of the circuit of electric-controlled steering valve group 3, the right steering solenoid valve 3.3 and the left steering solenoid valve 3.4 are used to control the steering valve stem 3.5, and the liquid outlets of main valve stem 3.1 are respectively connected to the liquid inlets of steering gear 4 and steering cylinder 5.

[0047] Among them, three gears are arranged inside the main valve stem 3.1, namely gear 1, gear 2 and gear 3. Gear 1 is used to guide the pressure oil into the steering gear 4 in manned mode and initial state, gear 2 is used to guide the pressure oil into the steering cylinder 5 and flow out from the L0 port in unmanned mode for left steering, and gear 3 is used to guide the pressure oil into the steering cylinder 5 and flow out from the R0 port in unmanned mode for right steering.

[0048] There are two positions inside the steering valve stem 3.5, which are respectively the left steering position and the right steering position. The left steering position is used for turning left in the electric control mode, and the pressure oil passes through the left steering position to adjust the main valve stem 3.1 to be in the second gear. The right steering position is used for turning right in the electric control mode, and the pressure oil passes through the right steering position to adjust the main valve stem 3.1 to be in the third gear.

[0049] The working principle is as follows: Figure 3As shown, when there is no one on the tractor and the tractor needs to turn left, the automatic steering mode is turned on, the mode solenoid valve 3.2 is energized, the right steering solenoid valve 3.3 is not energized, and the left steering solenoid 3.4 is energized. At this time, the oil enters the electric control steering valve group 3 and the left steering solenoid valve 3.4 from the PO port through the pump oil structure. First, the pressure oil passes through the left steering solenoid valve 3.4 and then acts on the left side of the steering valve stem 3.5. The oil pressure forces the steering valve stem 3.5 to move to the right, and the oil at the right end returns to the main valve stem through the right steering solenoid valve 3.3. 3.1, at this time, the main valve stem 3.1 is in the second gear position. At the same time, the pressure oil flows from the main valve stem 3.1 into the left steering position of the steering valve stem 3.5, and flows back into the main valve stem 3.1, and enters the L3 port of the steering cylinder 5 through the L0 port of the electric control steering valve group 3. The steering cylinder 5 moves right accordingly to make the vehicle turn left in the unmanned mode, and then flows back from the R3 port of the steering cylinder 5 into the R0 port of the electric control steering valve group 3, passes through the electric control steering valve group 3, and flows back to the oil tank 2 from the T0 port of the electric control steering valve group 3;

[0050] When no one is on the tractor and the tractor needs to turn right, the automatic steering mode is turned on, the mode solenoid valve 3.2 is energized, the right steering solenoid valve 3.3 is energized, and the left steering solenoid 3.4 is not energized. At this time, the oil enters the electric control steering valve group 3 and the right steering solenoid valve 3.3 from the PO port through the pump oil structure. First, the pressure oil passes through the right steering solenoid valve 3.3 and acts on the right side of the steering valve stem 3.5. The oil pressure forces the steering valve stem 3.5 to move to the left, and the oil at the left end returns to the main valve stem 3 through the left steering solenoid valve 3.4. .1, at this time, the main valve stem 3.1 is in gear position three. At the same time, the pressure oil flows from the main valve stem 3.1 into the right steering position of the steering valve stem 3.5, and flows back into the main valve stem 3.1, and enters the R3 port of the steering cylinder 5 through the L0 port of the electric control steering valve group 3. The steering cylinder 5 moves left accordingly to turn the vehicle right in the unmanned mode, and then flows back from the L3 port of the steering cylinder 5 into the L0 port of the electric control steering valve group 3, passes through the electric control steering valve group 3, and flows back to the oil tank 2 from the T0 port of the electric control steering valve group 3.

[0051] The above technical solution sets up an electric-controlled steering valve group 3 so that after the pressurized oil enters the electric-controlled steering valve group 3, it controls the charged state of the internal right steering solenoid valve 3.3 and the left steering solenoid valve 3.4, thereby controlling the direction of the oil, and finally affecting the left or right movement of the steering cylinder.

[0052] Preferably, the electronically controlled steering valve group 3 further comprises a first pressure limiting valve 3.6, the liquid inlet and liquid outlet of the first pressure limiting valve 3.6 are respectively connected to the liquid outlet and liquid return port of the oil pump structure, and the first pressure limiting valve 3.6 is used to adjust the oil pressure of the oil flowing out of the oil pump structure.

[0053] The working principle is: by setting the first pressure-limiting valve 3.6, when the oil pressure flowing out of the oil pump structure is too high, the oil pressure can be adjusted, thereby avoiding the possibility of oil leakage in the valve group due to excessive oil pressure.

[0054] The above technical solution avoids the problem of leakage of the steering valve group due to excessively high oil pressure or steering failure due to excessively low oil pressure by providing the first pressure-limiting valve 3.6.

[0055] Preferably, the liquid inlet of the steering cylinder 5 is communicated with the liquid outlet of the main valve stem 3.1, and the liquid outlet of the steering cylinder 5 is communicated with the liquid inlet of the main valve stem 3.1.

[0056] The working principle is as follows: when electric steering is performed, the pressure oil inside the main valve stem 3.1 can directly enter the steering cylinder 5, skipping the steering gear 4 to perform the electric steering operation.

[0057] The above technical solution connects the steering cylinder with the main valve stem 3.1, so that when the device turns left or right in unmanned mode, the oil can directly enter the steering cylinder 5 and flow back into the main valve stem 3.1 to complete the electronic steering operation.

[0058] Preferably, the steering gear 4 includes a main valve core 4.1 and a flow metering motor 4.2, the liquid inlet of the main valve core 4.1 is connected to the liquid outlet of the main valve stem 3.1 and the liquid outlet of the steering cylinder 5 respectively, the liquid outlet of the main valve core 4.1 is connected to the liquid inlet of the pump oil structure and the liquid inlet of the steering cylinder 5 respectively, the liquid outlet of the flow metering motor 4.2 is connected to the liquid inlet of the main valve core 4.1, the liquid inlet of the flow metering motor 4.2 is connected to the liquid outlet of the main valve core 4.1, and the flow metering motor 4.2 and the main valve core 4.1 are respectively connected to the steering column of the external steering wheel.

[0059] Among them, the main valve core 4.1 includes three position gears, namely the left position, the right position and the middle position. The left position is used in the manned mode, and the pressure oil is guided to flow into the main valve core 4.1 from the left side when passing through the main valve core 4.1, so as to perform the right turning operation of the device. The right position is used in the manned mode, and the pressure oil is guided to flow into the main valve core 4.1 from the right side when passing through the main valve core 4.1, so as to perform the left turning operation of the device. The middle position is used in the initial state, and the pressure oil is guided to directly return to the pump oil structure when passing through the main valve core 4.1.

[0060] The working principle is: in the manned operation mode, when a left turn is required, as shown in the attached manual Figure 2As shown, the oil is sucked by the oil pump structure, enters the electric control steering valve group 3 from the PO port through the oil pump structure, and flows out from the P1 port of the electric control steering valve group 3, and flows into the P2 port of the steering gear 4 accordingly, passes through the manual steering wheel, and the steering wheel drives the main valve core 4.1 to the right position, so that the pressure oil flows in from the right position of the steering gear 4, and flows out through the L2 port of the metering motor 4.2, and enters the L1 port of the electric control steering valve group 3. The oil enters from the L1 port of the electric control steering valve group 3, flows out from the L0 port of the electric control steering valve group 3, and finally enters the L3 port of the steering cylinder 5. The steering cylinder 5 moves right accordingly to turn left in the manned mode, and then flows back from the R3 port of the steering cylinder 5 into the R0 port of the electric control steering valve group 3, and flows back to the oil pump structure at the T0 port of the electric control steering valve group 3;

[0061] In the manned operation mode, when right steering is required, the oil is sucked by the oil pump structure, passes through the oil pump structure from the PO port into the electric control steering valve group 3, and flows out from the P1 port of the electric control steering valve group 3, and flows into the P2 port of the steering gear 4 accordingly, passes through the manual steering wheel, and the steering wheel drives the main valve core 4.1 to the left position, so that the pressure oil flows in from the left position of the steering gear 4, and flows out through the R2 port of the metering motor 4.2, and enters the R1 port of the electric control steering valve group 3. The oil enters from the R1 port of the electric control steering valve group 3, flows out from the R0 port of the electric control steering valve group 3, and finally enters the R3 port of the steering cylinder 5. The steering cylinder 5 moves left accordingly to turn the vehicle right in the manned mode, and then flows back from the L3 port of the steering cylinder 5 into the L0 port of the electric control steering valve group 3, and flows back to the oil pump structure at the T0 port of the electric control steering valve group 3;

[0062] In the initial steering state, when no steering is performed, in the initial state, the oil is transported to the P0 port of the electronically controlled steering valve group 3 through the oil pump structure, and the oil passes through the electronically controlled steering valve group 3 and is transported to the P2 port of the steering gear 4 through the P1 port. The oil flows back to the T0 port of the electronically controlled valve group through the T2 port of the steering gear 4, and then returns to the oil tank through the T0 port.

[0063] The above technical solution provides a steering gear, connects the steering gear to the steering column of the external steering wheel and connects the steering gear to the electronically controlled steering valve group, so that the steering gear can meet both manual control and electronic control modes.

[0064] Preferably, the steering gear 4 also includes a second pressure-limiting valve, the liquid inlet of the second pressure-limiting valve is connected to the liquid outlet of the main valve core 4.1, the liquid outlet of the second pressure-limiting valve is connected to the liquid inlet of the main valve core 4.1, and the second pressure-limiting valve is used to adjust the oil pressure of the oil flowing out of the electronically controlled steering valve group 3.

[0065] The first pressure limiting valve 3.6 and the second pressure limiting valve are both overflow valves.

[0066] The working principle is: by setting the second pressure-limiting valve, the oil pressure of the pressure oil from the electric-controlled steering valve group 3 can be further balanced, thereby further improving the use stability of the device.

[0067] The above technical solution improves the safety and stability of the steering gear by providing a second pressure-limiting valve and using it to adjust the oil pressure of the oil flowing out of the electronically controlled steering valve group 3.

[0068] Preferably, the oil pump structure includes an oil pump 2 and an oil tank, the liquid inlet of the oil pump 2 is connected to the liquid outlet of the oil tank, the return liquid port of the oil tank is respectively connected to the liquid outlet of the main valve core 4.1 and the liquid outlet of the main valve stem 3.1, and the liquid outlet of the oil pump 2 is respectively connected to the liquid inlet of the main valve stem 3.1, the liquid inlet of the left steering solenoid valve 3.4, the liquid inlet of the right steering solenoid valve 3.3 and the liquid inlet of the mode solenoid valve 3.2.

[0069] The working principle is: when the oil pumping structure pumps oil to the outside, the pressure oil is sucked by the oil pump 2 and pumped out to the outside through its own oil outlet, providing power for the normal operation of the entire valve group.

[0070] The above technical solution sets up an oil pump and an oil suction filter, and utilizes the cooperation between the oil pump and the oil suction filter, so that the oil can build up pressure before entering the steering valve group and filter out impurities at the same time.

[0071] Preferably, the oil pump structure further includes an oil suction filter 1, the liquid inlet of the oil pump 2 is connected to the liquid outlet of the oil suction filter 1, and the liquid inlet of the oil suction filter 1 is connected to the liquid outlet of the oil tank.

[0072] The working principle is as follows: by setting the oil suction filter 1, the pressure oil is filtered through the oil suction filter 1 when being sucked by the oil pump 2, thereby preventing impurities inside the pressure oil from entering the valve group and causing damage to the entire steering valve group, thereby improving the safety of the device.

[0073] The above technical solution provides an oil suction filter so that the oil pump filters the pressure oil before absorbing the pressure oil, thereby preventing impurities in the pressure oil from entering the valve group and the oil pump and causing damage.

[0074] A tractor steering system comprises a tractor steering valve group.

[0075] The working principle is: the tractor steering valve group is assembled in the tractor steering system so that it can cooperate with other parts of the tractor to form a complete steering system, so as to achieve the steering work of the whole system in manned mode and unmanned mode.

[0076] The above technical solution can improve the steering system of the tractor by assembling the tractor steering valve group in the steering system of the tractor.

[0077] Preferably, a tractor comprises a steering valve group for the tractor.

[0078] The working principle is: the tractor steering system is installed in the tractor so that it can cooperate with other systems of the tractor to achieve the steering work of the tractor in manned mode and unmanned mode.

[0079] The above technical solution enables the tractor to realize the functions of automatic driving steering and manual driving steering by assembling the tractor steering system in the tractor.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0081] 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 at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A steering valve group for a tractor, characterized in that: The invention comprises an oil pump structure, an electric-controlled steering valve group (3), a steering gear (4) and a steering cylinder (5); the oil pump structure is connected to the electric-controlled steering valve group (3) through a pipeline; the steering gear (4) is connected to a steering column of a steering wheel; the steering cylinder (5) is connected to a steering shaft of a vehicle wheel; and the electric-controlled steering valve group (3) is respectively connected to the steering gear (4) and the steering cylinder (5) through pipelines; The electrically controlled steering valve group (3) comprises a main valve stem (3.1), a mode solenoid valve (3.2), a right steering solenoid valve (3.3), a left steering solenoid valve (3.4) and a steering valve stem (3.5); the liquid outlet of the oil pump structure is respectively connected to the liquid inlet of the main valve stem (3.1), the liquid inlet of the left steering solenoid valve (3.4), the liquid inlet of the right steering solenoid valve (3.3) and the liquid inlet of the mode solenoid valve (3.2); the liquid inlet of the oil pump structure is connected to the liquid outlet of the main valve stem (3.1); the left steering solenoid valve (3.4) and the right steering solenoid valve (3.5) are connected to ...5); the liquid inlet of the oil pump structure is connected to the liquid outlet of the main valve stem (3.1); the left steering solenoid valve (3.4) and the right steering solenoid valve (3.5) are connected to the mode solenoid valve (3.2); the liquid inlet of the oil pump structure is connected to the liquid outlet of the main valve stem (3.1); the left steering solenoid valve (3.4) and the right steering solenoid valve (3.5) The liquid outlet of the solenoid valve (3.3) is respectively connected to the liquid inlet of the steering valve stem (3.5), and the liquid inlet and liquid outlet of the steering valve stem (3.5) are respectively connected to the liquid outlet and liquid inlet of the main valve stem (3.1). The mode solenoid valve (3.2) is used to control the on-off of the circuit of the electric control steering valve group (3). The right steering solenoid valve (3.3) and the left steering solenoid valve (3.4) are used to control the steering valve stem (3.5). The liquid outlet of the main valve stem (3.1) is respectively connected to the liquid inlet of the steering gear (4) and the steering cylinder (5).

2. A steering valve assembly for a tractor according to claim 1, characterized in that: The electrically controlled steering valve group (3) further comprises a first pressure limiting valve (3.6), the liquid inlet and the liquid outlet of the first pressure limiting valve (3.6) being respectively connected to the liquid outlet and the liquid return port of the oil pump structure, and the first pressure limiting valve (3.6) being used to adjust the oil pressure of the oil flowing out of the oil pump structure.

3. A steering valve assembly for a tractor according to claim 1, characterized in that: The liquid inlet and the liquid outlet of the steering cylinder (5) are respectively connected to the liquid outlet and the liquid inlet of the main valve stem (3.1).

4. A steering valve assembly for a tractor according to claim 1, characterized in that: The steering gear (4) comprises a main valve core (4.1) and a flow metering motor (4.2); the liquid inlet of the main valve core (4.1) is respectively connected to the liquid outlet of the main valve stem (3.1) and the liquid outlet of the steering cylinder (5); the liquid outlet of the main valve core (4.1) is respectively connected to the liquid inlet of the pump oil structure and the liquid inlet of the steering cylinder (5); the liquid inlet and liquid outlet of the flow metering motor (4.2) are respectively connected to the liquid outlet and liquid inlet of the main valve core (4.1); the flow metering motor (4.2) and the main valve core 4.1 are respectively connected to the steering column of the external steering wheel.

5. A steering valve assembly for a tractor according to claim 4, characterized in that: The steering gear (4) further comprises a second pressure-limiting valve, the liquid inlet and the liquid outlet of the second pressure-limiting valve being respectively connected to the liquid outlet and the liquid inlet of the main valve core (4.1), and the second pressure-limiting valve being used for adjusting the oil pressure of the oil flowing out of the electric-controlled steering valve group (3).

6. A steering valve assembly for a tractor according to claim 4, characterized in that: The oil pump structure comprises an oil pump (2) and an oil tank, the liquid inlet of the oil pump (2) is connected to the liquid outlet of the oil tank, the liquid return port of the oil tank is respectively connected to the liquid outlet of the main valve core (4.1) and the liquid outlet of the main valve stem (3.1), and the liquid outlet of the oil pump (2) is respectively connected to the liquid inlet of the main valve stem (3.1), the liquid inlet of the left steering solenoid valve (3.4), the liquid inlet of the right steering solenoid valve (3.3) and the liquid inlet of the mode solenoid valve (3.2).

7. A steering valve assembly for a tractor according to claim 6, characterized in that: The oil pump structure also includes an oil suction filter (1), the liquid inlet of the oil pump (2) is connected to the liquid outlet of the oil suction filter (1), and the liquid inlet of the oil suction filter (1) is connected to the liquid outlet of the oil tank.

8. A tractor steering system, characterized in that: It comprises a steering valve group for a tractor as claimed in any one of claims 1 to 6.

9. A tractor, characterized in that: Comprising a tractor steering system as claimed in claim 8.

Images