| 摘要 |
A chuck assembly includes a housing formed with an hydraulic fluid inlet, a sleeve mounted in the housing and formed with an annular groove, a shaft mounted rotatably in the sleeve and formed with a first fluid passage, a chuck unit mounted in the shaft, a piston subdividing a chamber between the chuck unit and the shaft into first and second compartments, and an annular elastic sealing member disposed in the annular groove and formed with a second fluid passage for passage of a hydraulic fluid from a supply through the hydraulic fluid inlet and the first fluid passage to the first compartment.
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