| 摘要 |
PROBLEM TO BE SOLVED: To avoid contact sliding of mutually opposite surfaces via a thrust bearing clearance, and maintain the stable rotation precision and the support force in the thrust direction. SOLUTION: A dynamic bearing device has a minute clearance C having a clearance width N smaller than a clearance width M of a thrust bearing clearance T<SB>S</SB>at the inside diameter side of the thrust bearing clearance T<SB>S</SB>. Therefore, when dynamic pressure does not display fully on the lubricating oil of the thrust bearing clearance T<SB>S</SB>, an opposite surface via the minute clearance C, that is, a second end surface 10a12 of a disc 10a of a disc hub 10 (flange part) contacts the upper end surface 8c of a bearing sleeve 8. Therefore, an opposite surface via the thrust bearing clearance T<SB>S</SB>, that is, a first end surface 10a11 of the disc hub 10 is prevented from sliding in contact with the upper end surface 9a of a housing 9, so that these surfaces are prevented from wearing, and the rotation precision and the support force in the thrust direction can be maintained. COPYRIGHT: (C)2008,JPO&INPIT
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