公开(公告)号：US09886975B2

公开(公告)日：2018-02-06

申请号：US15263943

申请日：2016-09-13

Applicant: MINEBEA CO., LTD.

Inventor： Weihong Yang ,  Daiki Kobayashi

IPC: G11B5/48 ,  G11B19/20

CPC classification number: G11B5/4813 ,  F16C19/06 ,  F16C19/54 ,  F16C33/80 ,  F16C35/07 ,  G11B19/2036

Abstract: A hard disk drive according to an embodiment of the present invention includes a pivot assembly bearing device with a shaft, rolling bearings and a sleeve, a cylindrical convex portion formed in a cover member at the upper side, protruding inward, and fixed to an upper end surface of the shaft, a convex portion formed on a base member at the lower side, protruding inward, and fixed to a lower end surface of the shaft, and a labyrinth gap formed by opposing an outer peripheral surface of the convex portion to an inner peripheral surface of a sleeve in a radial direction and/or by opposing an outer peripheral surface of the convex portion to the inner peripheral surface of the sleeve in a radial direction.