| 摘要 |
PURPOSE:To improve the operability and responsiveness by switching a rear wheel control valve via valve-operated cylinders with the discharge fluid of a metering cylinder interlocked with rear wheels, and making a rear wheel control valve switchable with solenoids. CONSTITUTION:A metering cylinder MC discharging the flow proportional to the steering quantity of a steering wheel 11 is provided, and its discharge fluid is guided into pilot chambers 30 and 31 of valve-operated cylinders VC1 and VC2. The feed and discharge of a fluid to a rear wheel cylinder RC are controlled by the switching of a rear wheel control valve RV via the operation of the valve-operated cylinders VC1 and VC2, and rear wheels 51 are steered in the opposite-phase mode. The rear wheel control valve RV is made switchable by controlling solenoids 34 and 35 provided on both sides of a spool 33 with a control C in response to input signals such as the vehicle speed and steering angle, and front and rear wheels are steered in the same-phase mode. |
