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. 14, 2021
Filed:
Nov. 03, 2020
Minebea Mitsumi Inc., Nagano, JP;
MINEBEA MITSUMI INC., Nagano, JP;
Abstract
A fluid dynamic bearing device prevents an oleophobic agent from wetting and spreading to a tapered seal portion, including lubricating oil C filled in a condition in which the oil is separated sandwiching a separator portionholding a gas layer arranged between two conical bearing members, and two primary tapered seal portionseach connecting to one of both ends along an axial direction of the separator portion, wherein width in a radial direction of the two primary tapered seal portiondecreases as each approaches toward the two conical bearing members, a gas-liquid interface of the lubricating oil C is located each of the two primary tapered seal portions, an oleophobic agent blocking portionis arranged at each of both ends in an axial direction of the separator portion, a separator central portionis arranged between the oleophobic agent blocking portionsof the separator portions, and an oleophobic coating is formed at least at the separator central portionof the separator portion