| 摘要 |
<p>PURPOSE:To enable most of the working fluid to pass through a bypass passage by inserting a cylindrical member to be interposed between a casing and a plunger and forming the bypass passage between an outer side of this cylindrical member and an internal surface of the casing. CONSTITUTION:When a pressure of fluid in a master cylinder side in a fluid path 7a is increased, the working fluid passes through a valve part 2 and a passage 2d, positioned in a side of a fluid in-out path 7, being allowed to flow in a wheel cylinder side of the fluid in-out path 7. Now when the pressure of fluid to the fluid in-out path 7 increases to a predetermined value or more, solenoids 4, 4 are energized closing the valve part 2 positioned in a side of a valve seat 2a and opening the valve part 2 positioned in a side of a valve seat 2b, and a pressure is relieved by allowing the working fluid to flow in a reservoir side through a bypass path 6 and a passage 2e. When a pressure of fluid in the fluid path 7a is reduced, the working fluid is returned from a side of the in-out path 7 and a path 7b passing through the bypass path 6 to a side of the fluid path 7a. In this way, the working fluid moves passing through the bypass path 6, so that no influence is given to movement of a plunger 1.</p> |
