| 摘要 |
PURPOSE:To enhance the feeling of reaction over the whole range of running speed, by providing a vehicle speed responsive type flow control valve. CONSTITUTION:When a vehicle comes to be in its high speed condition, a control device 15 receives a pulse signal from a vehicle speed sensor 14, and shifts a flow control valve 13 into the position H. Then the hydraulic pressure of an oil passage 7f comes to be lowest, which is transmitted to a pressure control valve 12 through a main pilot oil passage 7f1. Therefore, the hydraulic pressure of the oil passage 7d comes to be highest, which is transmitted through a pilot passage 7e1 to a change-over valve 11 which therefore selects the position H. Further, hydraulic pressure from an oil pump 1 is fed into a passage selector valve 2 to increase the output hydraulic pressure by a set value. With this arrangement the hydraulic pressures of oil passages 7a1, 7b1, 7b2, 7c1, 7c2, 7c3 rise up more than those upon stopping or low speed running of the vehicle, upon high speed running even if no steering is made, and these increased hydraulic pressures are transmitted to a chamber 6 on the reaction piston side. |
