Bearing assembly with integrated ferrofluid seal

Details Bearing assembly with integrated ferrofluid seal Bearing assembly with integrated ferrofluid seal

1984-01-09

1986-12-09

Heinz, S. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

277 80, 384478, G11B 5012

Patent

active

046283846

ABSTRACT:
A bearing assembly with an integrated single-stage ferrofluid seal apparatus incorporated therein, which assembly comprises a bearing assembly having an inner and outer race to define a raceway, a plurality of rolling elements retained within the raceway to permit rotation of the inner and outer races relative to one another, and a single-stage ferrofluid seal apparatus within the raceway and adjacent one side of the roller elements and which ferrofluid seal apparatus comprises a single-pole piece which extends into a close, noncontacting relationship with the surface of the inner or the outer race to define a radial gap, ferrofluid in the radial gap to form a ferrofluid seal, and an annular, permanent magnet secured to and adjacent the single-pole piece, the magnet having a generally-L sectional shape and in contact with one side and about one end of the pole piece to provide both a source of magnetic flux and as a magnetically insulating housing for the pole piece.

REFERENCES:
patent: 4491888 (1985-01-01), Brown

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