| 摘要 |
PURPOSE:To prevent a lubricant from its outflow in oil reservoir parts in the time of high speed rotation, by providing peripheral groove-shaped oil reservoirs in the periphery of, a shaft in its position neighboring to herringbone grooves. CONSTITUTION:A dynamic pressure type fluid bearing provides its herringbone grooves 11B, 11C in the peripheral surface of a bearing hole 11D of a sleeve 11A. While the internal bearing provides peripheral groove-shaped oil reservoirs 12A, 12B in the peripheral surface of a shaft 12. These peripheral groove-shaped oil reservoirs 12A, 12B are formed into a tapered shape small decreasing the diameter in the direction of separating from the herringbone groove, further the taper has a portion opposed to the bearing hole 11D. By this constitution, a lubricant can be prevented from its outflow in an oil reservoir part in the time of high speed rotation.
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