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:
Jun. 13, 2006
Filed:
Mar. 24, 2004
Yoshito Oku, Kyoto, JP;
Yusuke Matsumoto, Kyoto, JP;
Yoshito Oku, Kyoto, JP;
Yusuke Matsumoto, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
The present invention relates to a hydrodynamic bearing supporting a shaft and a sleeve so as to relatively rotate with respect to a rotation axis. In accordance with one example of the present invention, there is provided a hydrodynamic bearing in which a capillary seal portion is formed continuously in a bearing portion having a lubricating oil retained in a micro gap as a working fluid. The capillary seal portion is provided with a first capillary seal portion having a first radial gap, a dimension of the first radial gap being getting at least wider in accordance with increasing a distance from the bearing portion in the rotation axis, and a second capillary seal portion adjoining the first capillary seal portion and having a second radial gap, a dimension of the second radial gap being getting at least wider in accordance with increasing a distance from the bearing portion in the rotation axis. The second capillary seal portion is expanded progressively in accordance with getting toward an outer side in an axial direction.