WHEEL POSITION CORRECTING DEVICE FOR FULLY HYDRAULIC STEERING SYSTEM.

摘要

A wheel position correcting device for a pilot type fully hydraulic steering system of a vehicle for industrial use. This system is provided with a hydraulic circuit to connect a steering unit (30) operated by a wheel (H) to steering cylinders (D), (E) for turning the vehicule body, and further comprises: a sensor (110) to detect a turning angle of the wheel; a sensor (120) to detect a turning angle of the vehicle body; a controller (101) to compare outputs from these two sensors to drive a wheel position correcting valve (50) according to the difference between the outputs; a pilot type diverting valve (60) to allow wheel position correcting oil to branch from a switch pump circuit to a wheel position correcting solenoid valve (56); and a safety valve (40) to close a drain port of the pilot type diverting valve only when the driver performs steering with the wheel so that the pilot type diverting valve (60) feeds correcting oil to the correcting valve (50).