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:
Feb. 05, 2013
Filed:
Oct. 25, 2011
Applicants:
Kenji Hibi, Kuwana, JP;
Yasuhiro Yamamoto, Kuwana, JP;
Inventors:
Kenji Hibi, Kuwana, JP;
Yasuhiro Yamamoto, Kuwana, JP;
Assignee:
NTN Corporation, Osaka-shi, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16C 32/06 (2006.01); F16C 33/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A shaft member for a fluid dynamic bearing device that has a recess to cause a dynamic pressure effect of a fluid in a bearing clearance, which is formed on it by rolling, and where a surface layer portion of the recess and a surface layer portion of a surrounding region of the recess has a nitride layer, and where nitrogen is diffused and penetrated in a material of the shaft member that is formed by nitriding after the rolling.