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. 08, 1987
Filed:
Apr. 14, 1986
Kuldip Raj, Merrimack, NH (US);
Raoul Casciari, Bedford, NH (US);
Ferrofluidics Corporation, Nashua, NH (US);
Abstract
A bearing assembly with an integrated single-stage ferrofluid seal incorporated therein, which assembly comprises: a bearing assembly having an inner and outer race to define a raceway and a plurality of rolling elements within the raceway to permit rotation of the inner and outer races relative to one another; and a single-stage ferrofluid seal within the raceway and positioned adjacent one side of the roller element, and which ferrofluid seal comprises a single pole piece having one end which extends into a close, noncontacting relationship with the surface of the inner and outer races to define a radial gap, ferrofluid in the radial gap to form a seal, an annular permanent magnet secured to and adjacent the single pole piece, and a nonmagnetic permeable housing extending about a portion of the pole piece and the permanent magnet, to divert magnetic flux toward the surfaces of the inner or outer race in which the ferrofluid seal is formed in the radial gap, thereby providing a compact, integrated bearing assembly with a ferrofluid seal.