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:
May. 10, 2011
Filed:
Nov. 14, 2007
Koji Hirata, Ehime, JP;
Hiroaki Saito, Ehime, JP;
Takao Yoshitsugu, Ehime, JP;
Hiroyuki Kiriyama, Ehime, JP;
Koji Hirata, Ehime, JP;
Hiroaki Saito, Ehime, JP;
Takao Yoshitsugu, Ehime, JP;
Hiroyuki Kiriyama, Ehime, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In order to prevent oil leakage in a hydrodynamic bearing device comprising an opening section in close proximity to a radial bearing and a lubricating fluid reservoir, a shaft, thrust flange, sleeve, seal plate, and stopper plateare provided, a radial dynamic pressure bearing is formed in a radial clearance between the shaftand sleeve, and a thrust dynamic pressure bearing is formed in a thrust direction clearance between the sleeveand thrust flange. A connecting holeis formed that connects a gap between the sleeveand seal plateand a thrust direction gap between the sleeveand thrust flange. The relationship A<B<C is satisfied, where A is a radial clearance, B is a clearance between an outer peripheral surface of the shaftand an inner peripheral surface of the seal plate, and C is a clearance between a lower surface of the seal plateand an upper end face of the sleeve