公开(公告)号：US10030696B2

公开(公告)日：2018-07-24

申请号：US15506349

申请日：2015-08-25

Applicant: NTN CORPORATION

Inventor： Shinji Komatsubara ,  Tetsuya Kurimura ,  Yasuhiro Yamamoto

IPC: F16C17/02 ,  F16C33/10 ,  F16C33/12 ,  H02K5/16 ,  H02K7/08

Abstract: A ratio W1/W2 of a circumferential width W1 of each of inclined hill portions G2 of a radial dynamic pressure generating portion G and a circumferential width W2 of each of inclined groove portions G3 is 1.2 or larger. And when an inner diameter of a bearing member is D, the circumferential width W2 of each of the inclined groove portions satisfies 0.2D≤W2≤0.4D.