| 摘要 |
A pneumatic shaft assembly of machine tool has a housing, a sleeve lodged securely in the housing, and a shaft received in the sleeve. The sleeve is provided with an annular gas chamber and the two sets of balancing chambers in communication with the annular gas chamber. Each of the balancing chambers has a plurality of circular bores of identical diameter. The housing is furnished with an opening, which communicates with the annular gas chamber and permits the compressed gas to pass therethrough to enter the annular gas chamber, from which the compressed gas is directed to flow to the circular bores of the balancing chambers so that the compressed gas is uniformly distributed via the circular bores to a clearance formed between the shaft and the sleeve so as to reduce the friction between the shaft and the sleeve at such time when the shaft rotates or moves axially in relation to the sleeve.
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