| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device capable of preventing its thrust bearing part from lacking in the lubricating fluid and generating the specified dynamic pressure and also provide a motor equipped with such bearing device. SOLUTION: The dynamic pressure bearing device is structured so that a lubricating fluid is put fully continuously in a thrust micro-gap constituting thrust dynamic pressure bearing parts 10 and 12 and radial gaps 7 and 9 between a sleeve 6b and a shaft 4 supported capable of rotating relatively, in which the lubricating fluid in the thrust dynamic pressure bearing parts 10 and 12 flows outward in the radial direction through the action of centrifugal force, etc., to cause lacking in the lubricating fluid required in the bearing parts 10 and 12 likely generating the condition that the specified dynamic pressure is not obtained, and to hinder generation of such condition, the opposing surfaces to form the radial gaps 7 and 9 positioned outside in the radial direction of the thrust bearing parts 10 and 12 are furnished with spiral grooves as a pump working part to make pumping in the direction toward the bearing parts 10 and 12 to the lubricating fluid positioned outside in the radial direction of the bearing parts 10 and 12. |
