| 摘要 |
PROBLEM TO BE SOLVED: To constitute a power steering device for a front two-axle vehicle such that steering control can be maintained even when its engine-driven pump or the like stops with a simple structure and a compact size at low cost.SOLUTION: The power steering device includes: a main pump 10 driven by an engine and a main tank 12; a subpomp 11 driven by a driving means except the engine and a sub tank 13; a control valve 15 for switching fluid channels for hydraulic fluid from each pump; a main actuator 50 and a subactuator 51 for control of turning a rudder; a pump switching means 30 for switching a first state wherein the hydraulic fluid from the main pump 10 is fed to the control valve 15, and the fluid from the subpomp 11 is fed back to the sub tank 13, and a second state wherein the hydraulic fluid from the subpomp 11 is fed to the control valve 15; and an actuator switching means 40 for switching the hydraulic fluid from the control valve 15 to the main actuator 50 or the subactuator 51. |
