| 摘要 |
PURPOSE:To form a motor in a small size with hydraulic assist performed by hydraulic power to set a predetermined condition by providing a means in which pressure oil is supplied before the motor is actuated when it is actuated in an initial check prior to a rear wheel steering control. CONSTITUTION:A motor 26, which is correlated to a rear wheel steering shaft 14 to displace it and to change steering ratio that is the ratio of a rear wheel steering angle for a front wheel steering angle, and a hydraulic assist means 61, in which the displacement of the rear wheel steering shaft 14 by this motor 26 is assisted by hydraulic power, are provided. Further a pressure oil supply means 30 for supplying pressure oil to a hydraulic assist means 16 is provided, and when the motor 26 is actuated in an initial check, the pressure oil supply means 30 is controlled by a hydraulic control means 28 before the motor is actuated, and the pressure oil is supplied to the hydraulic assist means 61. |
