| 摘要 |
PROBLEM TO BE SOLVED: To enhance the performance of a steering device for a vehicle provided with a rotation-linear motion conversion device by adopting a rotation-linear motion conversion device in which an impact-resistance property is more excellent than a single screw type and a ball screw type rotation-linear motion conversion device and resistance to reverse an input is high. SOLUTION: The steering device 28R for the vehicle has an electric motor 36 as a rotation actuator; and the rotation-linear motion conversion device for converting the rotation movement of an electric motor 36 to linear motion. In the steering device, a steering angle of a steering wheel is varied to steer a wheel by relatively linearly moving a wheel side member 34 connected to a vehicle body side member 30 and a knuckle arm 26R connected to a rack bar of a power steering device 16. The rotation-linear motion conversion device is a planetary type differential screw type rotation-linear motion conversion device 38 having a screw shaft 48; a plurality of planetary screw rollers 76 arranged on the periphery of the screw shaft and thread-engaged with the screw shaft; and a roller nut 50 surrounding the screw shaft and the planetary screw roller and thread-engaged with the planetary screw rollers. COPYRIGHT: (C)2005,JPO&NCIPI
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