| 摘要 |
PURPOSE:To facilitate rear-wheel steering control by installing a pilot valve, generating a hydraulic signal conformed to an electric control signal, and a copying valve controlling the supply and exhaust of a hydraulic fluid to a power cylinder, and controlling each steering value of rear wheels by means of open loop control. CONSTITUTION:A rear-wheel steering system steers symmetrical rear wheels RW1, RW2 according to axial displacement of a relay rod 21 which is energized to a neutral position by a neutral returning spring 24, while it is driven in the axial direction by a power cylinder 25. In this case, the power cylinder 25 is made so as to be operated by discharge oil out of a hydraulic pump P via flow dividing valves D1-D3 by action of a copying valve being controlled by a hydraulic signal being supplied from a pilot valve 40 to be controlled by the hydraulic signal or an electric control signal to be supplied from a pressure transducer valve 30, via a limit valve 50 and the selector valve 60. |
