| 摘要 |
PURPOSE:To improve the lubricity by installing a small sphere between a thrust receiving plate on a motor side and a base member and forming a dynamic pressure generating groove on the thrust receiving plate. CONSTITUTION:A thrust receiving plate 7 having a spiral groove 6, base member 8 which is installed onto a motor shaft 5 and opposed to the thrust receiving plate 7, and a small sphere 9 set therebetween are provided. The thrust receiving plate 7 and the base member 8 opposed to the thrust receiving plate 7 form a recessed part 10 at the center, and the superior revolution can be achieved by the small sphere 9 set in the recessed part 10. Therefore, the local solid contact is prevented, and the heat generation phenomenon can be suppressed even if the lubricant such as oil and grease is used, and the generation of decomposition gas of lubricant can be suppressed.
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