| 摘要 |
PURPOSE:To prevent the rear-wheel lock due to the delay of starting-up of deceleration speed or the delay of response of a control valve itself by forming a throttle in the flow passage for the working-fluid pressure of a control valve for obtaining the output pressure proportional to deceleration speed. CONSTITUTION:As for a control valve, the atmosphere passing through a multihole- chamber plug 18 from an atmosphere taking-in port 16 flows into the first pressure chamber 12 through a communication hole 19 in no-brake application, and at the same time, since the atmosphere also flows into the second pressure chamber 13, passing a communication hole 17f formed onto an adjusting valve 17 and through the gap between an annular valve body 17a and a valve seat 17b, the both chambers 12 and 13 are put into the atmosphere, and a thrust force is not generated on a power piston 14. While, brake application is started, and an inertia force is generated, the annular valve body 17a shifts leftward and the passage between the valve seat 17b is cut off, and a valve seat 17e is separated from a fixed valve seat 17d, overwhelming the force of a spring 17c, and a vacuum pressure is introduced into the second pressure chamber 13, and the difference between the first and the second pressure chambers is controlled in proportion to the deceleration speed. |
