| 摘要 |
PROBLEM TO BE SOLVED: To provide a steering device for vehicle capable of switching a mode among front wheel steering mode for steering the only front wheels, a rear wheel steering mode for steering the only rear wheels, a front and rear wheels opposite phase steering mode for steering the front and rear wheels in the opposite directions, and a front and rear wheels same phase steering mode for steering the front and rear wheels in the same direction. SOLUTION: Any one of a front wheel steering hydraulic actuator 22 and a rear wheel steering hydraulic actuator 28 is operated by a hydraulic steering mechanism 37 directly connected to a steering operating tool 5, and the operation of the other actuator is controlled by a steering valve 38. In this case, the oil passage structure for operating the front wheel steering hydraulic actuator 22 with a hydraulic steering mechanism 37 and for controlling the operation of the rear wheel steering hydraulic actuator 28 with a steering valve 38 and the oil passage structure for operating the rear wheel steering hydraulic actuator 28 with the hydraulic steering mechanism 37 and for controlling the operation of the front wheel steering actuator 22 with the steering valve 38 are switched by oil passage switching valves 39, 40. |
