Accurate oil distribution hydraulic steering device

Abstract

The invention relates to an accurate oil distribution hydraulic steering device, and belongs to the technical field of the hydraulic transmission control of vehicles. A fluid distribution valve assembly is mounted at one end of a housing of the steering device, a linkage shaft is mounted in an inner hole of a valve core of the fluid distribution valve assembly in a penetrating manner, the other end of the housing is fixedly connected with a stator of a cycloid pin gear pair, and the other end of the linkage shaft is meshed with a rotor of the cycloid pin gear pair in a transmission manner; two oil distribution compensation flow channels which respectively pass through the fluid distribution valve assembly to be in direct communication with two ends of a steering hydraulic cylinder through a left oil transportation opening and a right oil transportation opening are formed in the housing, a steering input shaft is provided with a rotating angle sensor, wherein a signal output end of the rotating angle sensor is connected with an oil distribution compensation control circuit; a control output end of the control circuit is connected with controlled ends of the oil distribution compensation flow channels; and an oil distribution compensation electromagnetic valve is controlled to be at an opening position, an oil inlet opening is connected with a corresponding oil transportation opening through the oil distribution compensation flow channel of which the flow direction is the same as that of a flow distribution valve assembly through the cycloid pin gear a . Through the adoption of the accurate oil distribution hydraulic steering device disclosed by the invention, accurate oil distribution of the steering device to the steering hydraulic cylinder can be realized through complement, and accurate operation of a steering wheel to the rotating angle of the wheels is guaranteed.

Description

technical field [0001] The invention relates to a hydraulic steering gear, in particular to a precise oil distribution hydraulic steering gear, belonging to the technical field of hydraulic transmission control. Background technique [0002] Full-hydraulic steering gears are widely used in steering control devices on engineering vehicles such as construction machinery and forklifts. For their typical structures, please refer to Chinese patent application documents with application numbers 201110195256.9 and 201320401810.9. [0003] The spool and valve sleeve of the existing hydraulic steering gear, as well as the inner wall of the valve sleeve and the steering gear housing, will inevitably be worn due to relative movement. After the threshold is exceeded, the steering will not be in place, which cannot meet the precise control requirements of construction machinery vehicles such as precision forklifts. [0004] Studies have shown that the internal leakage of the hydraulic s...

AI Technical Summary

Problems solved by technology

The long-term accumulation of internal leakage caused the position of the steering wheel power-assisted ball to change. As a result, the position of the steering wheel and the position of the steering wheel could not correspond, which not only affected the control accuracy of the steering system, but also brought potential safety hazards.

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