| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a center valve type hydraulic master cylinder capable of quickly supplying operating fluid into a wheel cylinder by allowing the operating fluid to smoothly flow from an oil supply chamber to a communication hole in traction control. <P>SOLUTION: A hydraulic chamber 8 is partitioned between a front part shaft 6a of a piston 6 and a cylinder hole bottom part side. A stem hole 9 is formed on the central shaft of the front part shaft 6a, and the oil supply chamber 12 communicating to a fluid passing hole 10 is partitioned between a rear part shaft 6b of the piston 6 and the cylinder hole 3. A communication hole 13 communicating to the stem hole 6 and the oil supply chamber 12 is formed on the rear part shaft 6b, and a valve stem 14a of the center valve 14 is inserted into the stem hole 9. A stopper pin 15 abutting to the valve stem 14a is disposed in the communication hole 13, and the both end parts of the stopper pin 15 projecting from the inside of the communication hole 13 is held on a stopper ring 16 externally fitted to the rear part shaft 6b. A plurality of fluid passage 29 opening to the oil supply chamber 12 and the communication hole 10 is formed at a part disposed in the vicinity of the fluid passing hole of the stopper ring 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
