| 摘要 |
A high-speed air spindle including a spindle 1 supported by a first bearing 3 at the leading end side in the axial direction and a second bearing 2 at the rear end side, a driving air turbine 4 fixed in a spindle portion between the first bearing 3 and the second bearing 2, a speed-increasing air turbine 5 fixed in a spindle portion ahead of the first bearing 3, and an air passage 9 of an exhaust of compressed air supplied in the driving air turbine 4, flowing in the sequence of the first bearing 3 and the speed-increasing air turbine 5.
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