| 摘要 |
A fixed shaft type fluid dynamic bearing motor having two interfaces of a lubricant at least, in which a channel leading from near the outer region of a rotating sleeve top end to near the periphery of the bottom of the sleeve is formed in the sleeve. The lubricant near the outer region of a rotating sleeve top end is thrown out into the channel by centrifugal force, and further conveyed to near the periphery of the bottom of the sleeve by centrifugal force and/or by slanted channel in circumferential direction. A dynamic-pressure generating groove for pumping the lubricant toward the top end of the sleeve is formed between the fixed shaft and the sleeve. The dynamic-pressure generating groove and the centrifugal force cause the circulation of the lubricant, thereby sealing the lubricant. According to the invention, axial space smaller than that of tapered seals can be utilized to achieve a low-profile recording disk drive.
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