| 摘要 |
A hydraulic unit includes a case, a liner contained in the case, and a top cap and an opposing bottom cap plugged at the front and rear ends of the case. The unit further includes a spindle disposed in the liner and provided with a large diameter section. The large diameter section has a pair of blades with one having longer first pins and the other having shorter second pins on their front and rear end surfaces. A first oblong cam recess and a second oblong cam recess having a longer longitudinal axis and a shallower depth than the first recess are formed in the opposing inner surfaces of the bottom cap and the top cap. During rotation of the case, the cam recesses guide the first and second pins on the blades while preventing the blades from sliding on second sealing surfaces of the liner, which are associated with ribs on the spindle.
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