| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fluid dynamic bearing device which is excellent in quietness, high in accuracy, does not cause the deterioration of bearing performance, and can be manufactured at a low cost. <P>SOLUTION: The fluid dynamic bearing device 10 is composed of: an outer member 20 formed with respective radial dynamic grooves 12a and having a radial bearing face 29R formed with a trust bearing between and among thrust bearing faces 13T, 23T and 24T of the outer member 20 and an inner member 11 and the thrust bearing faces 23T, 24T formed at both ends of the radial bearing face; and the inner member 11. In the fluid dynamic bearing device, a lubrication fluid is interposed at the a dynamic bearing, a portion forming at least a radial bearing face 12R and the thrust bearing face 13T of the inner member 11 is formed of a sintered metal, and spaces 30a, 30b between the radial bearing face 12R and the thrust bearing face 13T are kept at positive pressure. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
