| 摘要 |
PURPOSE:To realize better depressurization and re-pressurization characteristics by a structure wherein an accumulator to hold the pressure liquid sucked up by a pumping mechanism and an intermediate liquid chamber to seal reduced pressure therein are provided. CONSTITUTION:When wheel lock occurs, a solenoid 8 is energized so as to close a first valve 4, resulting in shutting-off an input port 1 and an output port 2. After that, a solenoid 15 is energized so as to open a third valve 10 in order for hydraulic pressure to push a reservoir piston 18 and consequently to sharply lower its own pressure. A second valve 26 is closed by the movement of an engaging rod 30 accompanied by the sharp lowering of the hydraulic pressure, resulting in shutting an intermediate liquid chamber B off a main passage A. With opening of the valve 10, the liquid in a reservoir mechanism is sucked up to an accumulator 25 by means of a pumping mechanism 20. When the wheel lock is dissolved, the valve 10 returns to its normally closed state. After that, when the valve 4 is open, appropriate re-pressurization is applied from the accumulator 25 to a main passage output circuit C. |
