Abstract: A rear wheel steering apparatus comprises an electric motor for generating a rotational torque, an electric control device for controlling the rotation of the electric motor, a motion converting device for converting the rotational torque of the electric motor into a propulsion force in the direction of a width of a vehicle and connected to a rotational shaft of the electric motor, an output shaft for outputting the propulsion force in the direction of the width of the vehicle which is converted by the motion converting device, tie rods connecting between the output shaft and rear wheels and having a ball joint, respectively, a housing fixed to the vehicle and accommodating the electric motor, the motion converting device and the output shaft therein, a rear wheel steering angle detecting device for detecting a steering angle of the rear wheels steered by the output shaft, a regulating member connected to the housing and for prohibiting the output shaft from rotating while allowing the output shaft to move in

Abstract: A rear-wheel steering system designed to reduce noise to a minimum at a low cost. The rear-wheel steering system includes an electric motor for generating a rotational force, a nut member connected to the electric motor and rotated thereby, and a rod having both ends connected to rear wheels of a vehicle and an external thread portion in mesh with an internal thread portion of the nut member. The rod is axially moved by rotation of the nut member for rear-wheel steering, but is not allowed to rotate. In the system, the internal thread portion is in mesh with the external thread portion such that each axial center is off-center.

Abstract: The invention is directed to an apparatus for steering rear wheels of a vehicle. A vehicle speed sensor detects a speed of the vehicle, and a steering angle sensor detects a steering angle of front wheels of the vehicle and provides a first steering signal. A control device is provided for receiving the first steering signal and providing a second steering signal representing a desired steering angle of rear wheels of the vehicle which is determined in response to the first steering signal. A drive device is arranged to receive the second steering signal and steer the rear wheels to reach the desired steering angle. Then, a limit mechanism is provided for reducing the range of variation of steering angle of the rear wheels steered by the drive device to a predetermined range when the vehicle speed exceeds a predetermined speed, or the steering angle of the front wheels is less than a predetermined angle.