| 摘要 |
PURPOSE:To make it possible to obtain good travel feeling even in a case of failure by making so as to become in zero controlling hydraulic pressure supplied for a steering angle ratio setting mechanism and to become in zero steering angle ratio. CONSTITUTION:At a rear wheel steering device, when a first hydraulic pump 61 stops output on operating fluid with failure on the first hydraulic pump 61 or a driving system from an engine 62 to the same pump 61, controlling hydraulic pressure supplied for a hydraulic cylinder 46 gets to zero. When controlling hydraulic pressure gets to zero, a piston 46a and a piston rod 46b are displaced with force energized by a spring 54 and steering angle ratio zero is set up. Thereby, rear wheels are kept in neutral state in no relation to steering on right and left front wheels. |
