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:
Jun. 05, 2018
Filed:
Feb. 19, 2014
Shinji Komatsubara, Mie, JP;
Tetsuya Kurimura, Mie, JP;
Yasuhiro Yamamoto, Mie, JP;
NTN CORPORATION, Osaka, JP;
Abstract
Provided is a fluid dynamic bearing device () including a rotary body (A), a bearing member () (sleeve portion) made of a sintered metal arranged on the rotary body (A), having end surfaces (), a thrust bearing gap formed by a lower end surface () of the bearing member (), filled with lubricating oil (), and a thrust dynamic pressure generating portion (B). A dynamic pressure generating action is caused in the lubricating oil in the thrust bearing gap along with rotation of the rotary body (A) to support the rotary body (A) in one thrust direction in a non-contact manner. The bearing member () has an oil permeability of 4% or more with respect to a mass flow rate of the lubricating oil () flowing along the thrust dynamic pressure generating portion (B) during the rotation of the rotary body (A).