| 摘要 |
PURPOSE:To make it possible to produce a high effect of vibration suppression by providing a means for controlling the damping force of a fluid pressure cylinder in accordance with the pressure of fluid between a pressure source and a pressure control valve for controlling the pressure of fluid led from this pressure source to the fluid pressure cylinder. CONSTITUTION:A line pressure pipe line 3 connected to the discharge side of an engine driven hydraulic pump 1 is provided with branch pipes 6 corresponding to hydraulic cylinders 7 (7FR through 7RL) arranged for all wheels, each branch pipe 6 being disposed therein with a pressure control valve 4 (4FR through 4RL) and an pilot-operated selector valve 9 in that order from the upstream to downstream sides thereof. The pilot-operated selector valve 9s are shut off when the pressure of the line pressure pipe 3 is below a predetermined value, and flow passages 10 each having a fixed orifice 10a are provided bypassing the selector valves 9, respectively. When the selector valves 9 are shut off, the communications between the pressure control valves 4 and the hydraulic cylinders are established through the fixed orifices 10a so as to allow the hydraulic cylinders 7 to produce damping forces. |
