Bearing assembly with integrated ferrofluid seal

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

1986-04-14

1987-09-08

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

277 80, 384478, G11B 5012

Patent

active

046928260

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.

REFERENCES:
patent: 2834618 (1958-05-01), Wiltse
patent: 3620584 (1971-11-01), Rosenweig
patent: 4301487 (1981-11-01), Maruyama
patent: 4491888 (1985-01-01), Brown
patent: 4531846 (1985-07-01), Raj

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