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. 30, 2014
Filed:
Nov. 18, 2011
Hiroki Yamada, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Tsuyoshi Morita, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Takuro Iguchi, Kyoto, JP;
Hiroki Yamada, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Tsuyoshi Morita, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Takuro Iguchi, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
In a fluid dynamic bearing apparatus, an oil buffer is defined between a thrust gap and a pumping gap. The oil buffer has an axial dimension greater than that of the thrust gap, and/or has a radial dimension greater than that of the pumping gap. An air bubble generated in the thrust gap due to cavitation, for example, when a fluid dynamic bearing apparatus experiences a vibration can be dissolved in lubricating oil provided within the oil buffer. This prevents leakage of the lubricating oil due to the air bubble residing in the fluid dynamic bearing apparatus.