| 摘要 |
PURPOSE:To permit the operation which is not influenced by the temperature condition of working oil by installing a pressure increasing valve for increasing the pressure on the small-diameter side of a pressure increasing piston (power pressure) in the case where a brake pedal is stepped in and the master-cylinder pressure increases. CONSTITUTION:The brake hydraulic pressure supplied from a master cylinder is supplied into a wheel cylinder through a pipe 16a, actuator 300, and a pipe 16c, and the first chamber 109 of the actuator 300 is selectively connected to a reservoir 15 through the first solenoid valve 320 and to a power circuit 22 through the second solenoid valve 321, and a pressure increasing valve 400 for controlling the hydraulic pressure supplied into the power circuit 22 is provided. Said pressure increasing valve 400 is interposed between the power circuit 22 and the pipe 16a and equipped with a stepped pressure increasing piston 401. When the master-cylinder pressure increases, the power pressure formed by increasing the master-cylinder pressure is generated in the power circuit 22 side and can be supplied into the first chamber 109. |
