| 摘要 |
A bearing assembly is provided to restrain increase of pre-load of a bearing during high speed rotation by forming a transmission body of the bearing of a ceramic material. In a roller bearing assembly, a common shaft is supported by axially arranging roller bearings having a contact angle in three rows. The arrangement of the bearing is an asymmetric arrangement in which the numbers of opposite rows are different. The bearings having different bearing specifications are opposite to each other or the bearings of different bearing types are opposite to each other. The bearings on the smaller number row side have a high axial rigidity than the bearings on the larger number row side. All of the roller bearings are angular ball bearings.
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