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:
Sep. 21, 2010
Filed:
Mar. 17, 2005
Katsuo Shibahara, Kuwana, JP;
Kenji Ito, Kuwana, JP;
Isao Komori, Kuwana, JP;
Ryouichi Nakajima, Kuwana, JP;
Tetsuya Kurimura, Kuwana, JP;
Katsuo Shibahara, Kuwana, JP;
Kenji Ito, Kuwana, JP;
Isao Komori, Kuwana, JP;
Ryouichi Nakajima, Kuwana, JP;
Tetsuya Kurimura, Kuwana, JP;
NTN Corporation, Osaka-shi, JP;
Abstract
The present invention provides a fluid dynamic bearing device having high durability and capable of being produced at low cost. In the fluid dynamic bearing device, a housing and a disc hub are resin molded parts, and a thrust bearing gap is formed between an upper end surface of the housing and a lower end surface of the disc hub. In this case, the surfaces function as sliding portions temporarily in sliding contact with each other during operation of the bearing. A diameter of PAN-based carbon fibers blended as reinforcement fibers in the resin housing is 12 μm or less, and the blending amount is within a range of 5 to 20 vol %, thereby making it possible to prevent occurrence of flaws and wear in the sliding portions.