Steering wheel position compensator of fully hydraulic steering system

摘要

The steering wheel position compensator of a fully hydraulic steering device for working vehicle, etc. The fully hydraulic power steering device is provided with a steering unit (30) operated by a steering wheel (H) and a hydraulic circuit connecting steering cylinders (D,E) that turn the car body, a sensor (110) that detects the turning angle of the. steering wheel, a sensor (120) that detects the turning angle of the car body, a controller (101) that compares the outputs of these two sensors to actuate a steering wheel position deviation compensation solenoid valve (50) in accordance with the difference between the outputs of these sensors. There is a compensation flow distribution valve (60) that branches off the steering wheel position compensation oil from a steering pump circuit to the solenoid valve and a compensation circuit closing valve (40) that closes the drain port of the pilot hydraulic circuit of the flow distribution valve only when the steering wheel is operated by a driver and allows the flow distribution valve to supply the compensation oil to be solenoid valve are provided. @(24pp Dwg.No.1/8)@