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:
Jan. 18, 2005
Filed:
Nov. 01, 2001
Kazuhiko Koseki, Miyagi-ken, JP;
Makoto Endo, Miyagi-ken, JP;
Noriyuki Kadowaki, Miyagi-ken, JP;
Natsuhiko Mori, Mie-ken, JP;
Tetsuya Kurimura, Mie-ken, JP;
Kazuhiko Koseki, Miyagi-ken, JP;
Makoto Endo, Miyagi-ken, JP;
Noriyuki Kadowaki, Miyagi-ken, JP;
Natsuhiko Mori, Mie-ken, JP;
Tetsuya Kurimura, Mie-ken, JP;
NTN Corporation, Osaka-fu, JP;
Tohoku Ricoh Co., Ltd., Miyagi-ken, JP;
Abstract
A hydrodynamic bearing unit is provided, by which the touch between oil and a sealing member in a housing is prevented to prevent oil leakage. A bearing member made of a sintered lubricant-containing metal is disposed along the inner periphery of the housing and a spindle is supported in a non-contact manner by the hydrodynamic oil pressure that is generated in a bearing gap by the rotation of the spindle. The opening of the housing is sealed by the sealing member. A ventilation path is formed so as to communicate a sealed space enclosed by the distal end of the spindle at the bottom of the housing, the bearing member and the housing with open air. An oil reservoir is formed between the inner periphery of the housing and the outer periphery of the bearing member at the end portion of the opening side of the housing. The oil reservoir is made so as to communicate with the ventilation path.