| 摘要 |
PURPOSE:To make rear-wheel steering control performable with a simple mechanism by interlocking a hydraulic pump for supplying pressure oil to a rear-wheel steering device, to a wheel or axle, and linking up the valve rod of a spool valve in this rear-wheel steering device to the gearbox of a front-wheel steering mechanism. CONSTITUTION:In a rear-wheel steering device equipped with a hydraulic cylinder 10 which receives pressure oil from a hydraulic pump 7 via a spool valve 11, and steers rear wheels 9 by motion in the lateral direction of a piston rod 13, the hydraulic pump 7 is constituted so as to be driven by receiving rotation of each rear wheel 9 or axle at time of traveling. In addition, the spool valve 11 is composed of a nearly cylindrical valve housing 17 being set up in front of the hydraulic cylinder 10 and installed in fixed state and a valve rod 18 being fitted in the housing free of axial slide motion and rotatably with its part engaged with the housing 17 through a screw. This valve rod 18 is linked up to the gearbox of a front-wheel steering mechanism 1 via a shaft 30. |
