| 摘要 |
<p>PURPOSE:To make the steering ratio of rear wheel with respect to front wheel variable according to the vehicle speed, by converting the rotation of a rotary shaft interlocked with a front wheel steering mechanism through a steering ratio changing mechanism which is operated by means of an actuator being controlled corresponding to the vehicle speed. CONSTITUTION:In a rear wheel steering ratio changing mechanism 25, if an output shaft 16 is concentric with an input shaft 14, rotation of the input shaft 14 does not cause rotation of an yoke member 17 around the axis of its shaft 19, thereby a tierod 35 is not moved to the right/left and only the front wheel is steered. Upon variation of vehicle speed, a rear wheel steering controller 31 receives signals from a vehicle speed detecting means 32 and a position detecting means 33 to drive a motor 26. Consequently, a rolling member 22 rotates around a shaft 23 and inclines back and forth. Inclination of the rolling member 22 causes inclination of the output shaft together with the yoke member 17 so as to vary the steering angle of rear wheel.</p> |
