| 摘要 |
A collet assembly includes a collet and a tubular valve sleeve sleeved on a rotary shaft that is disposed within a stationary wall body and which defines a piston-receiving chamber. A piston is disposed movably in the piston-receiving chamber. The valve sleeve is formed with a valve opening therein, a valve chamber extending from the valve opening, a valve inlet in fluid communication with the valve chamber and a fluid injection passage in the stationary wall body, and a valve outlet in fluid communication with the valve chamber and a fluid channel in the shaft. A check valve is mounted in the valve chamber, and is moved to an open position, in which, the valve opening is opened due to injection of a high-pressure hydraulic oil into a clearance through the fluid injection passage, thereby permitting movement of the piston, which, in turn, results in clamping of the collet.
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