Rear-wheel steering controller

Abstract

Abstract PURPOSE:To improve reliability in time of rear-wheel steering, by installing such an elastic body that is designed so as to make spring reaction force work if steerage is performed as far as beyond the specified steering angle, in a front- wheel steering system, in case of a device which steers rear wheels only when steering torque in a car reaches a level of more than the specified value. CONSTITUTION:A four-wheel steering car varies each hydraulic fluid flow of oil passages 20 and 21 of a control valve 22 in response to a steering angle of a steering wheel 25. With this operation, a pressure differential to be produced in each of symmetrical chambers 19a and 19b of a power cylinder 19 is utilized, thereby assisting the steering force. And, simultaneously a rear-wheel steerig actuator 1 is operated, performing the steerage of rear wheels. In this case, a rubberlike elastic body 27 is attached to each stroke end of oil passages 19a and 10b of the fron-wheel steering power cylinder 19, and spring reaction force is made so as to work against such steerage as being beyond the specified steering angle in design. With this constitution, even if the wheel steering angle is a little put back, power steering hydraulic pressure is highly keepable, thus such drawbacks that rear wheels go back to a neutral position is solved.

Inventors

• 👤 Yukio Fukunaga
• 👤 由紀夫 福永

Bibliographic Details