| 摘要 |
PROBLEM TO BE SOLVED: To provide inexpensive multi-row angular ball bearings to be less heated with no degradation of spindle accuracy due to heat prevention by producing a less increase in the preload of the bearings due to the clogging of a gap between the bearing inside a row and the inner diameter face of a housing during temperature rise. SOLUTION: Inner rings 14 of three or more angular ball bearings 4A-4D arranged in axial rows are thrust in the axial direction to give preload to the bearings. In the multi-row angular ball bearings, the outer diameter of each of the axially inside bearings 4B, 4C is smaller than that of each of the axially outside bearings 4A, 4D. COPYRIGHT: (C)2007,JPO&INPIT
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