HYDRAULIC POWER STEERING APPARATUS FOR INDUSTRIAL VEHICLE

摘要

A fully hydraulic power steering apparatus provided with a hydraulic power cylinder driven by turning a steering wheel to provide rear wheels of an industrial vehicle with a pivoting motion, to thereby steer the vehicle, and an error correcting unit for mechanically correcting an error between an angle of turn of the steering wheel and a corresponding stroke motion of the hydraulic power cylinder. The error correcting unit mechanically derives respective linear movements from the angle of turn of the steering wheel and the corresponding stroke of the power cylinder, and utilizes a difference between both mechanical linear movements for operating a directional control valve for controlling a flow of a pressurized oil supplied from a power steering valve unit toward the power cylinder to correct the amount of the stroke of the power cylinder with respect to the amount of angle by which the steering wheel is turned.