| 摘要 |
<p>PURPOSE:To prevent the sticking of a piston due to the rusting thereof by causing a relative shift between the spool and the enclosure thereof via the operation of a movable body on every brake operation with brake fluid pressure. CONSTITUTION:A flow control valve 103 is so constituted that the one end thereof having a small diameter is inserted in the spool housing chamber of an enclosure 31, and kept in contact with the front end of a spool 32 in a direction energized with a spring 34, and the other end having a large diameter is provided with a piston 10 inserted in a piston chamber 12 and a spring 11 for detaching the piston 10 from the spool 32 for being retained with the force of the spring 11 during the non- application of braking operation. At the time of braking operation, the piston 10 is shifted down by a stoke of L on a fluid pressure differential working on both ends thereof and the spool 32 is forcibly moved toward the side of a decompression chamber 36 by the same distance as the piston 10. Both pressurized faces of the piton 10 are continuous to each other via an internal passage 10a. When the pressurized area differential of both ends is so determined as to obtain piston thrust overcoming the force of the spring 11 during the application of relatively low braking pressure Pn, the operation of the valve 103 is ensured even in non-antilock operation. According to this construction, it is possible to prevent the sticking of the piston 10 due to the rusting of the spool 32.</p> |
