FOUR-WHEEL STEERING DEVICE FOR CAR

摘要

PURPOSE:To smoothly perform the steering operation of rear wheels that follows steering of front wheels by summing up the movement of the same and inverse phase steering member and an inverse steering member and assisting the output using an actuator. CONSTITUTION:A control valve 19 that switches and controls a power cylinder 18 in accordance with the stroke direction of a tie rod 10 is arranged in the output member 13b of an addition mechanism 16 that sums up the movement of steering members 13 and 14 and transmits it to the steering member 10 of a rear wheel steering device 7. The control valve 19 is connected to an oil tank 23 through paths 21 and 22 and forms an actuator 24 that assists the steering of rear wheels 8L and 8R in accordance with the stroke direction of the tie rod 10 using a power cylinder 18. Since the output from the addition mechanism is assisted by the actuator 24, the rear wheel steering characteristics can be obtained with small steering force and the capability of a small sharp turn in a low car speed range can be improved.