| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the speed by surely feeding the air oil, to improve the rotational accuracy by improving the assembly accuracy of a bearing, to reduce the number of parts, and to realize miniaturization. SOLUTION: A spindle 1 is supported by a housing 5 at two points through bearing parts A, B consisting of a plurality of angular ball bearings. A nozzle 21 for ejecting the air oil which is open toward an inner ring rolling surface side and a discharge passage 22 of the ejecting air oil are provided on an outer ring 16 of each bearing.</p> |
