| 摘要 |
PURPOSE:To provide a rear wheel steering characteristic according to the car speed with a simple construction by using the discharge pressure of a pump, which operates synchronously with a rotary shaft to drive the rear wheels, as pilot pressure and thereby controlling the degree of opening of a control valve for steering rear wheels. CONSTITUTION:When operation of a steering wheel 1 switches over a front wheel control valve 2, the pressure oil from a hydraulic pump 5 is sent to one of the pressure chambers in a power cylinder 4, and movement of piston in one direction steers the front wheels 3 through a linkage 7. At the same time, pressure in the power cylinder 4 is transmitted to a rear wheel control valve 14 through divergent passages 15A, 15B, and the pressure oil led to another power cylinder 12 is controlled by this control valve 14, and the rear wheels 10 are steered by the power of this cylinder 12. At this time, the rear wheel control valve 14 uses the discharge pressure of another hydraulic pump 16, which is operated synchronously with rotation of the rear wheels 10, as pilot pressure, and the degree of valve opening is increased/decreased on the basis of this pilot pressure. |
