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:
Aug. 19, 2014
Filed:
Aug. 05, 2011
Junya Mizukami, Kyoto, JP;
Takayuki Oe, Kyoto, JP;
Yoichi Sekii, Kyoto, JP;
Naoki Sabashi, Kyoto, JP;
Hideki Nishimura, Kyoto, JP;
Takehito Tamaoka, Kyoto, JP;
Takashi Yamamoto, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Takayuki Oe, Kyoto, JP;
Yoichi Sekii, Kyoto, JP;
Naoki Sabashi, Kyoto, JP;
Hideki Nishimura, Kyoto, JP;
Takehito Tamaoka, Kyoto, JP;
Takashi Yamamoto, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A dynamic pressure bearing is defined in a first gap between a shaft portion and a sleeve portion. An upper seal portion extending upward and a lower seal portion extending downward are arranged radially outward of the dynamic pressure bearing. Each of the upper seal portion and the lower seal portion includes a surface including a lubricating oil located therein. The upper seal portion and the lower seal portion are arranged in communication with each other through a communicating hole defined in the sleeve portion. The communicating hole and a space ranging from the upper seal portion to the lower seal portion through the first gap are filled with the lubricating oil. The axial distance between the surfaces of the lubricating oil in the upper seal portion and the lower seal portion is arranged to be shorter than the axial distance between an upper end and a lower end of the dynamic pressure bearing.