公开(公告)号：US20210040990A1

公开(公告)日：2021-02-11

申请号：US16767285

申请日：2018-12-07

Applicant: NTN CORPORATION

Inventor： Kazuyoshi HARADA ,  Shinji KOMATSUBARA ,  Shouhei OKA ,  Jun HIRADE

IPC: F16C33/74 ,  F16C17/08 ,  F16C17/02

Abstract: A fluid dynamic bearing device 1 includes: a shaft member 2; a bearing sleeve 8 that has the shaft member 2 inserted into the inner periphery thereof; a housing 7 that holds the bearing sleeve 8 on the inner periphery thereof and has a bottomed cylindrical shape having an opening at an end portion on one axial side; and a seal member 9 provided at the opening of the housing 7. The seal member 9 has a disk portion 9a disposed on one axial side of the bearing sleeve 8, and a protrusion (cylindrical portion 9b) protruding to the other axial side from an outer diameter end of the disk portion 9a. An outer peripheral surface 9c of the seal member 9 is fixed to an inner peripheral surface 7a1 of the housing 7.