| 摘要 |
<p>PURPOSE:To eliminate a large shock applied onto an auxiliary master cylinder by installing a restricting valve which restricts the liquid flow by a throttle, into a hydraulic circuit starting from the second chamber to the auxiliary master cylinder. CONSTITUTION:A control valve V0 is installed in a hydraulic circuit starting from the second chamber R12 to an auxiliary master cylinder 13. In the control valve V0, a ball 56 urged by a spring 55 is set onto the conical sheet part of a holder 53 and the liquid flow from the second chamber R12 to the auxiliary master cylinder 13 is restricted through a communication groove formed on the conical sheet. The liquid flow starting from the auxiliary master cylinder 13 to the second chamber R12 through an auxiliary inlet port 20c is executed free from restriction by the pressing by the ball 56. Therefore, a series of the operation that the pressurized liquid in the second chamber R12 is returned into the pressure chamber 13a of the auxiliary master cylinder 3 is suppressed, and the erroneous operation that a brake pedal 15 is sharply returned is prevented.</p> |
