Two-stage Priority Structure Control Valve Block in Closed Center Load Feedback Hydraulic System
A load feedback and hydraulic system technology, applied in the field of tractors, can solve the problems of increasing pipeline connections, inconvenient design and installation layout, etc., and achieve the effect of reducing the number of parts, simplifying design and installation layout structure, and rigorous system structure
Active Publication Date: 2017-09-12
FIRST TRACTOR
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Problems solved by technology
Existing priority valves are generally single-stage priority control. When many modules are integrated in the hydraulic system, multiple single-stage priority valves are required to control the distribution of hydraulic oil between different modules. It is necessary to increase the pipeline connection accordingly, which brings great inconvenience to the design and installation arrangement
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[0007] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 As shown, the two-stage priority structure control valve block in the closed-center load feedback hydraulic system mainly includes: priority valve body 1, load feedback check valve 2, secondary priority valve balance damping 3, secondary priority spool 4, Second priority valve reset damping 5, second priority valve reset spring 6, steering pressure limiting valve 7, first priority valve reset damping 8, first priority valve reset spring 9, first priority valve core 10, first priority valve balance Damping 11, first-level priority valve check valve 12; the integrated priority valve body 1 is equipped with a casting cavity and a connecting oil passage, and the oil is connected to the priority valve through the inlet A of the priority valve body 1, and the first-level priority The spool 10, and its components at the left and right ends are installed at the...
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The two-stage priority structure control valve block in the closed-center load feedback hydraulic system includes: priority valve body, load feedback check valve, secondary priority valve balance damping, secondary priority valve core, secondary priority valve reset damping, secondary priority valve Level priority valve return spring, steering pressure limiting valve, level one priority valve reset damping, level one priority valve return spring, level one priority valve core, level one priority valve balance damping, level one priority valve check valve; priority valve body The interior is equipped with a casting cavity and a connecting oil passage. The first-level priority valve core, the first-level priority valve reset damping, the first-level priority valve return spring, the first-level priority valve balance damping, and the first-level priority valve check valve are installed in the casting cavity in sequence. ;The secondary priority valve core, the secondary priority valve balance damping, the secondary priority valve reset damping, and the secondary priority valve reset spring are arranged in the casting cavity in sequence; The casting cavity is combined as a whole, and the interior is connected by casting oil passages.
Description
technical field [0001] The invention belongs to the field of tractors, and relates to a hydraulic system of a wheeled tractor, in particular to a control valve block with a two-stage priority structure in a closed-center load feedback hydraulic system. Background technique [0002] At present, on various types of high-power wheeled tractors produced in China, the hydraulic system of high-end tractors adopts variable pump with closed-center load feedback system. This type of closed-center load feedback system includes: steering part, braking part, clutch control part, lifting part and multi-way valve output part. Among them, a priority valve is used to balance the pressure of each part. Existing priority valves are generally single-stage priority control. When many modules are integrated in the hydraulic system, multiple single-stage priority valves are required to control the distribution of hydraulic oil between different modules. It is necessary to increase the pipeline ...
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IPC IPC(8): F15B13/02
Inventor 张璐薛志飞王东青雷蕾刘涛张凯赵研科王琳
Owner FIRST TRACTOR