CN215927968U - Electric control steering valve, hydraulic system and loader - Google Patents
Electric control steering valve, hydraulic system and loader Download PDFInfo
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- CN215927968U CN215927968U CN202121697850.3U CN202121697850U CN215927968U CN 215927968 U CN215927968 U CN 215927968U CN 202121697850 U CN202121697850 U CN 202121697850U CN 215927968 U CN215927968 U CN 215927968U
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Abstract
The utility model relates to a vehicle steering technology, aiming at solving the problems of heavy operation, large steering noise and complex system in the existing steering system, the utility model constructs an electric control steering valve, a hydraulic system and a loader, wherein the electric control steering valve is provided with a P port, a Pi port and a T port and comprises a priority valve, a steering main valve core, a three-way left-turning electric proportional valve and a right-turning electric proportional valve, the P port is connected with the oil inlet end of the steering main valve core through the priority valve, an LS port of the steering main valve core is connected with a spring cavity of the priority valve through a damping hole, the oil inlet and outlet ports of the left-turning electric proportional valve are respectively connected with the Pi port and the left-turning hydraulic control end of the steering main valve core, the oil inlet and outlet ports of the right-turning electric proportional valve are respectively connected with the Pi port and the right-turning hydraulic control end of the steering main valve core, and the oil return ports of the left-turning electric proportional valve and the right-turning electric proportional valve are both connected with the T port. The utility model has the advantages of small steering operation torque, low steering noise, simple structure and the like.
Description
Technical Field
The utility model relates to a vehicle steering technology, in particular to an electric control steering valve, a hydraulic system and a loader.
Background
The steering system of the existing engineering machinery such as a loader, a land leveler and the like is composed of a steering pump, a priority valve, a steering gear, a steering oil cylinder and corresponding connecting pipelines, wherein the steering gear is mechanically connected by a steering wheel, and the steering gear is driven by the rotation of the steering wheel to rotate and output pressure oil to drive the steering oil cylinder to displace so as to realize steering action; or the steering device is mechanically connected by a steering wheel, the steering device is driven by the rotation of the steering wheel to rotate and output hydraulic oil to control the displacement of a main valve core of the flow amplifying valve and output pressure oil to drive the displacement of the steering oil cylinder to realize steering action;
in recent years, due to the development of an electric control technology, the electric control steering technology is applied, a steering system is combined with an electric control steering valve on the basis of the original constitution, the electric control steering valve obtains a steering signal from a steering handle to control a main valve core of the steering valve to displace and output a pressure oil cylinder to drive the steering oil cylinder to realize steering action, or the electric control steering valve outputs pressure oil to control the flow amplification valve to amplify the main valve core of the valve and outputs the pressure oil to drive the steering oil cylinder to displace to realize the steering action.
The problems of heavy operation and steering noise caused by mechanical connection of a steering wheel in the conventional steering system are solved, steering control of the steering wheel is parallel to electric control steering of a handle, the complexity of the system is increased, the cost is greatly increased, and the reliability risk is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems of heavy operation, high steering noise and complex system in the existing steering system, and provides an electric control steering valve, a hydraulic system and a loader, which can reduce the steering operation torque, reduce the steering noise and simplify the system structure.
The technical scheme for realizing the purpose of the utility model is as follows: the electric control steering valve is characterized by comprising a P port, a Pi port and a T port, and comprises a priority valve, a steering main valve core, a three-way left-turning electric proportional valve and a three-way right-turning electric proportional valve, wherein the P port is connected with an oil inlet end of the steering main valve core through the priority valve, an LS port of the steering main valve core is connected with a spring cavity of the priority valve through a damping hole, an oil inlet and an oil outlet of the left-turning electric proportional valve are respectively connected with the Pi port and a left-turning hydraulic control end of the steering main valve core, an oil inlet and an oil outlet of the right-turning electric proportional valve are respectively connected with the Pi port and a right-turning hydraulic control end of the steering main valve core, and oil return ports of the left-turning electric proportional valve and the right-turning electric proportional valve are both connected with the T port.
In the electric control steering valve, oil supplementing one-way valves are connected between two working oil ports and a T port of the steering main valve core. Furthermore, overflow valves are connected between the two working oil ports and the T port of the steering main valve core. The oil supplementing check valve and the overflow valve form an overload oil supplementing valve, unloading is carried out when the steering pressure is too high, or oil is supplemented when the oil cylinder stretches too fast, and air suction is avoided.
In the electric control steering valve, an overflow valve is arranged between the spring cavity of the priority valve and the T port.
The technical scheme for realizing the purpose of the utility model is as follows: the electric control steering hydraulic system comprises a hydraulic oil tank, a steering pump and a steering oil cylinder, wherein an oil inlet of the steering pump is connected with the hydraulic oil tank, the electric control steering valve is characterized by further comprising the electric control steering valve, a controller, an electronic steering wheel and an electric control steering handle, the electronic steering wheel and the electric control steering handle are connected with a signal input end of the controller, electromagnetic coils of a left-turning electric proportional valve and a right-turning electric proportional valve are connected with a control output end of the controller, a Pi port is connected with a pilot oil source, a large cavity and a small cavity of the steering oil cylinder are respectively connected with two working oil ports of a steering main valve core, and an oil return port of the steering main valve core is connected with the hydraulic oil tank through the T port. In the utility model, an electronic steering wheel or an electric control steering handle is adopted for steering operation, the operation torque is small, the steering noise is low, the steering of the handle and the steering of the steering wheel control the steering main valve core by controlling the electric proportional valve through the controller, and the structure is simple.
The electric control steering hydraulic system also comprises a remote control steering receiving device which is connected with the controller and used for receiving remote control steering signals. The remote control steering receiving device receives the remote control steering signal and can realize remote control steering.
In the above electrically controlled steering hydraulic system, the steering pump may be a variable displacement pump, such as a plunger pump, or a fixed displacement pump, such as a gear pump. When the steering pump can be a variable displacement pump, the LS port of the steering main valve core is connected with the LS port of the variable displacement pump, so that the variable displacement pump can adjust the displacement according to the load.
The technical scheme for realizing the purpose of the utility model is as follows: a loader is constructed, and comprises a working hydraulic system, and is characterized by comprising the electric control steering hydraulic system, wherein an EF port of the priority valve is connected with an oil inlet of a multi-way valve of the working hydraulic system.
Compared with the prior art, the steering device has the advantages of small steering operation torque, low steering noise, simple structure and the like.
Drawings
FIG. 1 is a schematic diagram of an electronically controlled steering valve of the present invention.
Fig. 2 is a schematic diagram of the electronically controlled steering hydraulic system of the present invention.
Part names and serial numbers in the figure:
the hydraulic steering system comprises a hydraulic oil tank 1, a variable pump 2, an electronic control steering valve 3, a priority valve 301, an overflow valve 302, a steering main valve core 303, a left-turning electric proportional valve 304, a right-turning electric proportional valve 305, a right-turning overload oil supplementing valve 306, a left-turning overload oil supplementing valve 307, a controller 4, an electronic steering wheel 5, an electronic control steering handle 6, a remote control steering receiving device 7 and a steering oil cylinder 8.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
As shown in fig. 1, the electronically controlled steering valve 3 in the present embodiment has a P port, a Pi port, a T port, and includes a priority valve 301, the main steering valve 303, the three-way left-turning electric proportional valve 304 and the right-turning electric proportional valve 305 are connected, a port P is connected with an oil inlet end of the priority valve 301, a port CF of the priority valve 301 is connected with an oil inlet end of the main steering valve 301, a port EF of the priority valve 301 is connected with an oil inlet end of a distribution valve in a working hydraulic system of the loader, an oil return port of the main steering valve 303 is communicated with a port T, a port LS of the main steering valve 303 is connected with a spring cavity of the priority valve 301 through a damping hole, an oil inlet and an oil outlet of the left-turning electric proportional valve 304 are respectively connected with a port Pi and a left-turning hydraulic control end of the main steering valve 303, an oil inlet and an oil outlet of the right-turning electric proportional valve 305 are respectively connected with the port Pi and a right-turning hydraulic control end of the main steering valve 33, and oil return ports of the left-turning electric proportional valve 304 and the right-turning electric proportional valve 305 are both connected with a port T2. When a left steering operation is performed, the oil inlet end and the oil outlet end of the left steering electro proportional valve 304 are communicated, and the oil outlet end and the oil return end of the right steering electro proportional valve 305 are communicated, so that the right pilot control end of the steering main valve core is communicated with the port T2, and the valve rod of the steering main valve core moves to the right under the hydraulic oil pressure of the left pilot control end. Similarly, when a right steering operation is performed, the oil inlet end and the oil outlet end of the right steering electro proportional valve 305 are conducted, and the oil outlet end and the oil return end of the left steering electro proportional valve 304 are conducted, so that the left pilot control end of the steering main valve element is conducted with the port T2, so that the valve rod of the steering main valve element moves to the left under the hydraulic oil pressure of the right pilot control end. An overflow valve is arranged between the spring cavity of the priority valve and the T port.
A right-turn overload oil compensating valve 306 and a left-turn overload oil compensating valve 307 are respectively connected between two working oil ports of the steering main valve core 303 and a port T2. The right-turn overload oil compensating valve 306 and the left-turn overload oil compensating valve 307 are both composed of a check valve and an overflow valve, wherein the oil inlet end of the overflow valve is connected with the working oil port corresponding to the main steering valve core, the oil outlet end of the overflow valve is connected with the T2 oil port, the oil inlet end of the check valve is communicated with the T2 port, and the oil outlet end of the overflow valve is connected with the working oil port corresponding to the main steering valve core. Unloading is carried out when the steering load pressure is overlarge, or oil is supplemented when the oil cylinder stretches out and draws back too fast, so that air suction is avoided.
As shown in fig. 2, the electrically controlled steering hydraulic system of the loader in the present embodiment includes a hydraulic oil tank 1, a variable displacement pump 2 having an oil inlet connected to the hydraulic oil tank 1, a steering cylinder 8, an electrically controlled steering valve 3, a controller 4, an electronic steering wheel 5, an electrically controlled steering handle 6, and a remote control steering receiving device 7.
The electronic steering wheel 5, the electric control steering handle 6 and the remote control steering receiving device 7 are all connected with the signal input end of the controller 4 and used for inputting steering signals to the controller 4. Wherein the electronic steering wheel 5 comprises a steering wheel and a sensor driven by the steering wheel to generate an electrical signal, the sensor being connected to the controller 4. The remote control steering receiving device 7 is used for receiving remote control steering signals so as to realize remote control steering operation. The solenoids of the left-turn electro-proportional valve 304 and the right-turn electro-proportional valve 305 are both connected with the control output of the controller.
The Pi port is connected to a pilot oil source, for example, a pilot pump, or a pilot supply valve. The big cavity and the small cavity of the steering oil cylinder 8 are respectively connected with two working oil ports of the steering main valve core 303, the LS port of the steering main valve core 303 is connected with the LS port of the variable displacement pump 2, and the oil return port of the steering main valve core 303 is connected with a hydraulic oil tank through the T port.
In the embodiment, an electronic steering wheel or an electric control steering handle is adopted for steering operation, the operation torque is small, the steering noise is low, the steering main valve core is controlled by controlling the electric proportional valve through a controller in both handle steering and steering wheel steering, and the structure is simple.
Claims (9)
1. An electric control steering valve is characterized by comprising a P port, a Pi port and a T port, and comprising a priority valve, a steering main valve core, a three-way left-turning electric proportional valve and a right-turning electric proportional valve, wherein the P port is connected with an oil inlet end of the steering main valve core through the priority valve, an LS port of the steering main valve core is connected with a spring cavity of the priority valve through a damping hole, an oil inlet and an oil outlet of the left-turning electric proportional valve are respectively connected with the Pi port and a left-turning hydraulic control end of the steering main valve core, an oil inlet and an oil outlet of the right-turning electric proportional valve are respectively connected with the Pi port and a right-turning hydraulic control end of the steering main valve core, and oil return ports of the left-turning electric proportional valve and the right-turning electric proportional valve are connected with the T port.
2. The electric control steering valve according to claim 1, wherein an oil supplementing one-way valve is connected between the two working oil ports and the T port of the steering main valve core.
3. An electrically controlled steering valve according to claim 1 or 2, wherein overflow valves are connected between the two working oil ports of the steering main valve core and the T port.
4. The electrically controlled steering valve according to claim 1, characterized in that an overflow valve is provided between the spring chamber of the priority valve and the T-port.
5. An electric control steering hydraulic system comprises a hydraulic oil tank, a steering pump and a steering oil cylinder, wherein an oil inlet of the steering pump is connected with the hydraulic oil tank, the electric control steering valve, a controller, an electronic steering wheel and an electric control steering handle are in any one of claims 1 to 4, the electronic steering wheel and the electric control steering handle are connected with a signal input end of the controller, electromagnetic coils of a left-turning electric proportional valve and a right-turning electric proportional valve are connected with a control output end of the controller, a Pi port is connected with a pilot oil source, a large cavity and a small cavity of the steering oil cylinder are respectively connected with two working oil ports of a steering main valve core, and an oil return port of the steering main valve core is connected with the hydraulic oil tank through the T port.
6. The electronically controlled steering hydraulic system of claim 5, further comprising a remote steering receiving device coupled to the controller for receiving a remote steering signal.
7. The electrically controlled steering hydraulic system according to claim 5 or 6, characterized in that the steering pump is a variable displacement pump, and the LS port of the steering main spool is connected to the LS port of the variable displacement pump.
8. The electrically controlled steering hydraulic system according to claim 5 or 6, characterized in that the steering pump is a fixed displacement pump.
9. A loader comprising a working hydraulic system, characterized by having the electrically controlled steering hydraulic system of any one of claims 5 to 8, the EF port of the priority valve being connected to the oil inlet of a multi-way valve of the working hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121697850.3U CN215927968U (en) | 2021-07-26 | 2021-07-26 | Electric control steering valve, hydraulic system and loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121697850.3U CN215927968U (en) | 2021-07-26 | 2021-07-26 | Electric control steering valve, hydraulic system and loader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215927968U true CN215927968U (en) | 2022-03-01 |
Family
ID=80397134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121697850.3U Active CN215927968U (en) | 2021-07-26 | 2021-07-26 | Electric control steering valve, hydraulic system and loader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215927968U (en) |
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2021
- 2021-07-26 CN CN202121697850.3U patent/CN215927968U/en active Active
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