| 摘要 |
PURPOSE: A master cylinder is simple in structure comparing with a center valve type master cylinder and prevents interference between a seal and a bypass hole. CONSTITUTION: A master cylinder has a first round part(74), a compensating hole(54) and a second round part(76). The first round part(74) is formed on an inner wall(68) of the master cylinder for oil to bypass and on the corner of a first bypass hole(52) to dissolve interference with a seal(68). The compensating hole(54) is formed on one side of the first bypass hole(52) by penetrating the upper part of a piston guide(73) of a second piston(58) to easily compensate oil. The second round part(76) is formed on the inner wall(68) of the master cylinder for oil to bypass and on the corner of a second bypass hole(53) to dissolve interference with a seal(72).
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