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:
May. 01, 2012
Filed:
Feb. 25, 2011
Atsushi Yawata, Kyoto, JP;
Yoichi Sekii, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Hirofumi Kojima, Kyoto, JP;
Atsushi Yawata, Kyoto, JP;
Yoichi Sekii, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Hirofumi Kojima, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A fluid dynamic bearing mechanism includes a stationary bearing portion including a sleeve portion, and a rotating bearing portion including an outer rotating portion. A lubricating oil is arranged between the stationary and rotating bearing portions. A first dynamic pressure groove array is arranged in an upper surface of the sleeve portion or a lower surface of the outer rotating portion. A second dynamic pressure groove array is arranged in a surface of the outer rotating portion or a surface of the stationary bearing portion in a region between the first array and a liquid surface. An end of the second array closer to the liquid surface is arranged radially inward of an opposite end of the second array. An upper end opening of a communicating channel defined in the sleeve portion is arranged radially outward of a radially inner end of the first array.