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:
Dec. 16, 2008
Filed:
Sep. 27, 2005
Applicants:
Koji Kuyama, Yonago, JP;
Kumio Masuda, Yonago, JP;
Kinjiro Okinaga, Yonago, JP;
Inventors:
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 5/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
Fluid bearing mechanisms (and) are formed between a shaft () and a central part () of an oil impregnated sintered sleeve (). The oil impregnated sintered sleeve () has such an inner surface formed to be larger in aperture ratio at a thrust support end () and a loading end () than at a central part (). With this configuration, it is possible to achieve a brushless motor which can suppress an increase in bearing loss while obtaining necessary bearing stiffness at high rpm.