| 摘要 |
PURPOSE:To obtain a device to be formed into small thickness and high accuracy, by connecting a parallel groove with and between two helical grooves and filling a most area of the grooves with a lubricant. CONSTITUTION:While a shaft 23 is in rotation, bubbles 12E, 12F, contained in a lubricant, are discharged by two helical grooves 23A, 23B. This is because the lubricant of larger specific gravity is stronger pumped than the bubble of smaller specific gravity, as the result, the bubbles 12E, 12F are discharged. Bubbles 12G, contained in a central parallel groove 23C, are gradually discharged by the helical grooves 23A, 23B, and the bubbles in a bearing are almost removed. Accordingly, most of the whole unit of a bearing part is filled with the lubricant, and a disc device or the like can be oriented to small thickness and high performance.
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