| 摘要 |
[PROBLEMS] To allow a hydraulic fluid to gain a smooth access to hydraulic chambers (82) while guiding two pistons (74). [MEANS FOR SOLVING PROBLEMS] In these hydraulic fluid reservoir and hydraulic pressure control unit, the hydraulic pressure chamber (82) is formed in a doughnut shape, and an opening for the passage of the hydraulic fluid is disposed at the center of the doughnut shape. The piston (74) is formed in a stepped structure comprising a large diameter portion (74L) and a small diameter portion (74S). The large diameter portion (74L) is fitted to a cylinder hole (560) and the small diameter portion (74S) is fitted to a second cylinder hole (562). The hydraulic fluid gains an access to the hydraulic chambers (82) through groove passages (90) on the outer periphery of the small diameter portions (74S).
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