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:
Sep. 04, 2007
Filed:
Nov. 08, 2004
Applicant:
Shigeharu Sumi, Kyoto, JP;
Inventor:
Shigeharu Sumi, Kyoto, JP;
Assignee:
Nidec Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K 5/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fluid dynamic pressure bearing having a tapered seal part provided between a sleeve and a housing, from which lubricating liquid is injected and functions as a buffer of the lubricating liquid. An end part of a radial gap between the sleeve and a shaft body is a labyrinth filled with lubricating liquid. An opening periphery is covered with an oil repellent film to prevent outflow of the lubricating liquid. These features can make the size of the tapered seal part small in the axial direction. It enables a larger radial dynamic pressure bearing mechanism to be formed and, in particular, bearing rigidity in the radial direction can be increased.