| 摘要 |
PROBLEM TO BE SOLVED: To surely restrain the generation of an air hammer caused by the compressibility of air. SOLUTION: A spindle 14 is rotatably supported to a housing 12 via porous air bearings 26 and 28. The spindle 14 is connected to a motor rotary shaft 44 of an electric motor 38 via a flange 18. The housing 12 has air passages 30 and 32 exhausting air introduced from an air supply port 34 from an exhaust port 36 via the porous air bearings 26 and 28. The porous air bearings 26 and 28 are constituted by integrating a radial bering and a thrust bearing. The flanges 16 and 18 of the spindle 12 have pockets 50 and 52 for storing air passing through the porous air bearings 26 and 28, air exhaust passages 54 and 56 for introducing air stored in the pockets 50 and 52 to the outside of the spindle, and orifices 58 and 60 for adjusting flow rates of air passing through the air exhaust passages 54 and 56. COPYRIGHT: (C)2009,JPO&INPIT
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