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. 30, 2018
Filed:
Oct. 23, 2015
Railway Technical Research Institute, Tokyo, JP;
Eagle Industry Co., Ltd., Tokyo, JP;
Tomohisa Yamashita, Tokyo, JP;
Masafumi Ogata, Tokyo, JP;
Yuki Arai, Tokyo, JP;
Keisuke Yoshizawa, Tokyo, JP;
Yoshihisa Takano, Tokyo, JP;
Shinji Nishida, Tokyo, JP;
RAILWAY TECHNICAL RESEARCH INSTITUTE, Tokyo, JP;
EAGLE INDUSTRY CO., LTD., Tokyo, JP;
Abstract
A magnetic fluid sealing structure () for high-speed rotation for sealing a gap (S) between a shaft member () and a housing member () disposed around the shaft member (), which are rotatable, includes: magnetic force generating means () which is fixed to the housing member () and generates a magnetic force; magnetic pole members () disposed on both sides in an axial direction of the magnetic force generating means (); and a magnetic fluid () which is magnetically held between the magnetic pole members () and the shaft member () by the magnetic force of the magnetic force generating means () and seals the gap (S) therebetween, in which the shaft member () has a plurality of different material layers concentrically laminated in a radial direction, and an outermost diameter layer () of the shaft member (), which holds the magnetic fluid (), is made of a magnetic material.