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:
Oct. 11, 2011
Filed:
Jul. 24, 2008
Takafumi Asada, Osaka, JP;
Hiroaki Saito, Ehime, JP;
Daisuke Ito, Osaka, JP;
Shigeo Obata, Hyogo, JP;
Takafumi Asada, Osaka, JP;
Hiroaki Saito, Ehime, JP;
Daisuke Ito, Osaka, JP;
Shigeo Obata, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a hydrodynamic bearing device with which the lubricant is prevented from leaking to the outside, and good seal performance can be maintained, and in a spindle motor equipped with this hydrodynamic bearing device, the hydrodynamic bearing device includes a shaft, a sleeve, a lubricant that fills a microscopic gap, a radial bearing portion, a thrust bearing portion, and a bearing seal portion. The value of a function P/V, where Vis a fluctuation volume of the sleeve in the axial direction and Pis a capillary pressure index at a vapor-liquid interface located near the opened end of the bearing seal portion, is at least a specific value.