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. 27, 1989
Filed:
Dec. 16, 1987
Applicant:
Inventors:
Kyozaburo Furumura, Ninomiya, JP;
Shigeki Matsunaga, Tokyo, JP;
Assignee:
Nippon Seiko Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C / ; F16J / ;
U.S. Cl.
CPC ...
384478 ; 277 80 ; 277135 ; 384133 ; 384446 ;
Abstract
A bearing assembly comprised of a housing, a shaft extending through the housing, a bearing disposed between the housing and the shaft and a seal disposed among the housing, the shaft and the bearing. The seal comprises an annular magnet, a pole piece affixed to the annular magnet and a ferrofluid injected into a gap between the pole piece and the shaft. Thus, a magnetic circuit for retaining the ferrofluid is formed by the seal, the bearing and the pole piece.