| 摘要 |
PROBLEM TO BE SOLVED: To furthermore reduce the cost of a shaft member for a hydrodynamic bearing apparatus. SOLUTION: The outside peripheral surface of the journal portion 2a of the shaft member 2 is arranged so as to face to the inside peripheral surface of a bearing sleeve across a radial bearing clearance. In addition, both end faces 2b1, 2b2 of a flange portion 2b face to one end face of the bearing sleeve and the bottom surface of a housing across thrust bearing clearances respectively. The shaft member 2 is supported, in a non-contact state, by the hydrodynamic pressure produced in the respective bearing clearances. The core portion of the journal portion 2a and the flange portion 2b of the shaft member 2 are made of a resinoid material 21. The outside periphery of the shaft member 2 is made of a metallic material 22. COPYRIGHT: (C)2005,JPO&NCIPI
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