| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that there is a need to secure sufficient bearing performance in a 60 mm angle or 80 mm angle large-sized fan. <P>SOLUTION: This bearing device 4 includes an almost cylindrical bearing part 72, a cap member 43 closing a lower part of the bearing part, an almost cylindrical holder 31 supporting the bearing part within it, and a thrust plate 42 extending outward radially from a lower end part of a shaft 41 inserted into the bearing part. The holder has a large diameter part larger in outer diameter than the outer peripheral surface. A part of the bearing part which is situated radially more inward than the large diameter part includes a plate accommodating part accommodating the thrust plate therein. The diameter of an outer peripheral surface of the plate accommodating part is larger than the diameter of an outer peripheral surface of a part situated on the upper side of the plate accommodating part of the bearing part, a width between the outer peripheral surface and an inner peripheral surface of the plate accommodating part is smaller than a width between the outer peripheral surface and an inner peripheral surface of the upper side part, and a thrust dynamic bearing part generating a fluid dynamic pressure of the lubricating oil is configured in a thrust gap between an upper surface of the thrust plate and an annular surface of the bearing part axially facing the upper surface. <P>COPYRIGHT: (C)2013,JPO&INPIT |
