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. 01, 2009
Filed:
May. 31, 2006
Katsuo Ishikawa, Ehime, JP;
Tsutomu Hamada, Osaka, JP;
Katsuo Ishikawa, Ehime, JP;
Tsutomu Hamada, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A hydrodynamic bearing device including a sleeve (), a shaft (), and oil (). With respect to the sleeve (), a stepped portion () provided at one end and an inner peripheral face () extending linearly in the axial direction and continuously with the stepped portion () are formed by a working method that involves the use of a metal mold. The shaft () is inserted so as to be capable of relative rotation with respect to the inner peripheral face () of the sleeve (). The oil fills the space formed between the inner peripheral face of the sleeve and the outer peripheral face of the shaft. Dynamic pressure generation grooves (and), which open in the axial direction at at least one end in the axial direction of the inner peripheral face () and are continuous in the axial direction from one end, are formed in the inner peripheral face.