| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing structure reducing heat generation and damage to a rotary bearing by combinedly using the rotary bearing and a non-contact type bearing. SOLUTION: A contact type bearing 2 using a rotary bearing is adopted for the both outside parts out of the bearings for a rotary main spindle 1, and a non-contact type bearing 3 such as a magnetic bearing, an air bearing, or an oil bearing is adopted for the inside parts so as to reduce the heat generation and damage to the rotary bearing and stably hold the main spindle.
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