| 摘要 |
PURPOSE:To make it possible to control right and left rear wheels by the same steering angle by forming a rear wheel control valve for controlling a pair of single rod type rear wheel-cylinders by two control units separately controlling the flowrates to two chambers of each cylinder, and independently introducing fluid to each control unit. CONSTITUTION:In a rear wheel steering system, a mode-changeover valve MV which is controlled by a controller 17, for switching rear wheels in phase with front wheels or in reverse phase to front wheels, a pair of rear wheel-pumps RP1, RP2, and a pair of rear wheel-flow control valves FV1, FV2 controlling the delivery flowrates from the pumps are provided. A rear wheel control valve V2 is formed to be provided with control units LV, RV separately controlling the flowrates to rod-side chambers 26, 29 and bottom-side chambers 27, 28 of each single rod type rear wheel-cylinder, RC1, RC2 to drive each rear wheel- cylinder RC1, RC2 by hydraulic fluid passed through the same valve V2. |
