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. 02, 2025
Filed:
Sep. 01, 2021
Ntn Corporation, Osaka, JP;
Masashi Yamagou, Mie, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A fluid dynamic bearing (bearing sleeve) includes a first dynamic pressure generating partand a second dynamic pressure generating partthat are provided in an inner peripheral surfaceso as to be spaced apart from each other in an axial direction. The respective dynamic pressure generating partsandhave a plurality of dynamic pressure generating grooves, andarranged in a herringbone shape and having different tilt directions. The first dynamic pressure generating parthas an annular hill partbetween the axial directions of the plurality of dynamic pressure generating groovesandhaving different tilt directions. The plurality of dynamic pressure generating groovesand, having different tilt directions, of the second dynamic pressure generating partare continuous in the axial direction.