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. 18, 2009
Filed:
Nov. 30, 2005
Fumiyasu Higuchi, Kitasaku-gun, JP;
Naoyuki Kondo, Kitasaku-gun, JP;
Toshimitsu Horiuchi, Kitasaku-gun, JP;
Fumiyasu Higuchi, Kitasaku-gun, JP;
Naoyuki Kondo, Kitasaku-gun, JP;
Toshimitsu Horiuchi, Kitasaku-gun, JP;
Minebea Co., Ltd., Kitasaku-gun, JP;
Abstract
A fluid dynamic pressure bearing device includes a first capillary seal () formed between an outer circumferential surface of a bearing memberand an internal circumferential surface of a seal member (). A second capillary seal portion () is formed between an outer circumferential surface of a shaft member () and a protrusion hole () of the seal member (). A ventilation hole () is formed in a substantially intermediate portion of a side wall of the seal member. A lubricant holding gap () is formed between an inner surface of a top wall () of the seal member () and the upper end surface of the bearing member (). Leakage of lubricant () is suppressed by action of the capillary seal portions (), and the liquid surface is positioned in the first capillary seal portion () above the ventilation hole (), whereby extra lubricant () is filled in the first capillary seal portion () and the lubricant holding gap ().