| 摘要 |
PURPOSE:To improve the endurance and reliability of a hydraulic pressure supply source by providing a bypass valve for bypassing pressure oil in such a way as to adjust hydraulic pressure fed from said source to a pressure control valve depending upon the pressure of pressure oil supplied from said source to the pressure control valve. CONSTITUTION:A hydraulic actuator 1 as an active type suspension device is provided between a vehicle body and a wheel. On the other hand, a pump 7 as a hydraulic pressure supply source is installed and the delivery side thereof is connected to a delivery side pipe 8, while the suction side thereof connected to a tank 9 respectively. Also, a pressure control valve 15 is connected to the downstream side of a non-return valve 10 in the delivery side pipe 8 via a line pressure pipe. In the aforesaid constitution, a bypass pipe 31 to be connected to the tank 9 is provided at the upstream side of the non-return valve 10 in the delivery side pipe 8. And a bypass valve 32 is provided on the way of the bypass pipe 31 and the pilot pressure thereof is taken from line pressure P between the non-return valve 10 and the pressure control valve 15. |
