STEERING DEVICE FOR FRONT AND REAR WHEELS OF VEHICLE

PURPOSE:To reduce the consumption of electric power in a steering device which alters the ratio of steered angle of rear wheels to front wheels, by varying the ratio of steered angle stepwise in relation to the speed of a vehicle to diminish the time of the variation of the ratio. CONSTITUTION:A slider 27 for altering the steered angle of rear wheels depending on that of front wheels is coupled to a motor 29. A computer 31 mounted on a vehicle receives signals from rotary sensors 35a-35c for detecting the speed of the vehicle, and a signal from a position sensor 33 for detecting the position of the slider 27, so that an appropriate signal corresponding to the vehicle speed is applied to the motor 29 to steer the rear wheels. For the rotary sensors 35a- 35c, a rotary disc 36 is provided at a speedometer 34 comprising a rotary shaft 34a, a section 34b for driving the shaft, a pointer 34c and a speed indication dial 34d. Light transmitted through the long hole 36a of the disc 36 is detected by the photodiodes of the rotary sensors to find out the vehicle speed stepwise. The ratio of steered angle is controlled stepwise in relation to the vehicle speed found out stepwise.