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:
Oct. 08, 2013
Filed:
Jan. 11, 2013
Nidec Corporation, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Takayuki Oe, Kyoto, JP;
Yoichi Sekii, Kyoto, JP;
Naoki Sabashi, Kyoto, JP;
Takehito Tamaoka, Kyoto, JP;
Takashi Yamamoto, Kyoto, JP;
Shigeki Horiki, Kyoto, JP;
Kazushi Miura, Kyoto, JP;
Mitsuhiro Takemoto, Kyoto, JP;
Kazuhiro Sato, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and an upper thrust portion. The upper thrust portion includes a tubular first outer circumferential surface arranged radially outside the upper thrust portion, and a tubular second outer circumferential surface arranged above the first outer circumferential surface. The rotating portion includes a sleeve portion, a tubular portion, and an annular cover portion. The annular cover portion includes a plate portion and an inner annular projecting portion arranged to project upward or downward. An inner circumferential surface of the inner annular projecting portion is arranged above an inner circumferential surface of the tubular portion. An upper seal portion includes a surface of a lubricating oil located therein. The inner circumferential surface of the inner annular projecting portion and the second outer circumferential surface are arranged opposite to each other with an axially extending gap therebetween.