The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2014
Filed:
Jan. 06, 2012
Hiromichi Kokumai, Kuwana, JP;
Kazuyoshi Harada, Kuwana, JP;
Isao Komori, Kuwana, JP;
NTN Corporation, Osaka-shi, JP;
Abstract
A fluid dynamic bearing device (), comprising a dynamic pressure generating groove region (B) being provided on an inner peripheral surface () of a bearing member (), which forms a radial bearing gap, the region (B) comprising: a first region (B) for generating a fluid dynamic pressure when the bearing member () and a shaft member () are rotated relative to each other in a forward direction; and a second region (B) for generating a fluid dynamic pressure when the bearing member () and the shaft member () are rotated relative to each other in a reverse direction. A portion of the region (B), corresponds to an end portion on an open-to-air side of the radial bearing gap, comprises an annular projecting portion () provided closer to the shaft member () with respect to a groove bottom of each of the plurality of dynamic pressure generating grooves ().