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:
Feb. 19, 2013
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 spindle motor includes a stationary portion and a rotating portion. The stationary portion preferably includes a shaft portion, an upper thrust portion, and an outer tubular portion. The rotating portion preferably includes an inner tubular portion, a flange portion, an upper hub annular portion, and a lower hub annular portion. The flange portion includes a communicating hole. An upper surface of a lubricating oil is located in a fifth gap defined between an upper thrust portion and an upper hub annular portion, while a lower surface of the lubricating oil is located in a sixth gap defined between an outer tubular portion and a lower hub annular portion. The communicating hole and a space extending from the fifth gap to the sixth gap through a fourth gap, a first gap, a second gap, and a third gap are continuously filled with the lubricating oil.