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:
Mar. 06, 2012
Filed:
Mar. 01, 2007
Tetsuya Yamamoto, Kuwana, JP;
Isao Komori, Kuwana, JP;
Yoshiharu Inazuka, Kuwana, JP;
Masaharu Hori, Kuwana, JP;
Tetsuya Yamamoto, Kuwana, JP;
Isao Komori, Kuwana, JP;
Yoshiharu Inazuka, Kuwana, JP;
Masaharu Hori, Kuwana, JP;
NTN Corporation, Osaka-shi, JP;
Abstract
An outer peripheral surface () of a bearing sleeve () is formed on a radially inside with respect to a first dynamic pressure generation portion (B). In this case, it is possible to reduce a thickness of the bearing sleeve () while securing a first thrust dynamic pressure generating portion (B) which has a thrust load capacity equivalent to that in a conventional case where a thrust dynamic pressure generating portion is formed in an end surface of the bearing sleeve. Accordingly, it is possible to reduce the thickness of the bearing sleeve () without sacrificing a bearing performance in a thrust direction. With this structure, a total amount of a lubricating oil sealed in a bearing device can be reduced, thereby reducing a capacity of a buffering function so as to downsize a sealing portion (), and by extension, downsizing a fluid dynamic bearing device ().