| 摘要 |
<P>PROBLEM TO BE SOLVED: To have proper backlash at a meshing part in a screwing mechanism in a rear wheel steering device, and to prevent a male screw and a female screw from slipping on a screwing surface due to an external force acting in a radial direction of a steering shaft from each tie rod. <P>SOLUTION: In the rear wheel steering device, a pressing force applying means 70 which applies a pressing force N to one end portion (shape changing portion 40a) of the steering shaft 40 in the radial direction, and presses a trapezoid male screw 62a towards a trapezoid female screw 61a is provided in a housing 10. The pressing force applying means 70 has its pressing force N arranged in the opposite direction of an action direction of the external force (Fsinθ) acting in the radial direction of the steering shaft 40 from each tie rod. The pressing force N is set to be larger than the supposed maximum value of the external force. A pressing force receiving means 80 which shares the pressing force N by the pressing force applying means 70 with the trapezoid female screw 61a at a predetermined ratio A:B, and receives the force when the external force not more than the supposed maximum value acts in the radial direction of the steering shaft from each tie rod, is provided in the housing 10. <P>COPYRIGHT: (C)2011,JPO&INPIT |
