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.:

US 8724257 B1

PDF
Full Text
Expired
Date of Patent:
May. 13, 2014

Filed:

Mar. 08, 2013
Applicants:

Yoichi Sekii, Kyoto, JP;

Hiroshi Konno, Kyoto, JP;

Chiharu Fujii, Kyoto, JP;

Inventors:

Yoichi Sekii, Kyoto, JP;

Hiroshi Konno, Kyoto, JP;

Chiharu Fujii, Kyoto, JP;

Assignee:

Nidec Corporation, Kyoto, JP;

Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 19/20 (2006.01); F16C 32/06 (2006.01);
U.S. Cl.
CPC ...
Abstract

A bearing apparatus includes an upper annular portion that has a circular or substantially circular ring shape, and is arranged to project radially outward from a stationary shaft. One of an upper surface of a sleeve and a lower surface of the upper annular portion includes a first pumping groove array arranged to send a lubricating oil radially inward. The sleeve includes a second inner circumferential surface arranged radially outside of the upper annular portion. One of a lower surface of a cap, an upper surface of the upper annular portion, the second inner circumferential surface, and an outer circumferential surface of the upper annular portion includes a second pumping groove array arranged to send the lubricating oil radially outward or axially downward.


Find Patent Forward Citations

Sekii, Yoichi. (2014). Hydrodynamic bearing apparatus and spindle motor and disk drive apparatus including the same (U.S. Patent No. 8724257). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8724257

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