| 摘要 |
<p>There is provided a closed type thrust dynamic pressure bearing which is capable of generating enough dynamic pressure for axially bearing a rotating member at the time of start-up and which never damages an end face of a flange of the rotating member. The flange 1 of the rotating member 3 is housed in a housing 2 in a closed state. V-shaped dynamic pressure generating grooves 8 are provided at upper and lower end faces 5, 6 of the flange 1, while a plurality of holes 11 axially passing through the flange 1 are provided radially inside an annular region where the dynamic pressure generating grooves 8 are provided. The total sum of cross-sectional areas of the holes 11 is at least 1/30 of the area of an annular region 7. Further, oil sumps 13 are provided at a receiving surface 12 of the housing 2 opposite to the lower end face 6 of the flange 1. <IMAGE></p> |
