Compact ferrofluid seal and bearing assembly

Details Compact ferrofluid seal and bearing assembly Compact ferrofluid seal and bearing assembly

1983-12-27

1985-07-30

Levy, Stuart S.

Bearings

Rotary bearing

Antifriction bearing

277 80, 277135, 384133, B65D 3374, F16C 124, F16C 3374

Patent

active

045318468

ABSTRACT:
The compact ferrofluid seal and radial bearing assembly, particularly useful for the support and sealing of a shaft, such as a computer disk drive shaft, where space is at a premium, which assembly comprises a magnetically-permeable radial bearing apparatus having inner and outer race elements, moveable elements, and a cage element to retain the moveable elements, and a ferrofluid single-stage seal apparatus comprising a radially-polarized permanent magnet to retain a sealing amount of ferrofluid in a radial gap between the inner and outer race elements.

REFERENCES:
patent: 3620584 (1971-11-01), Rosensweig
patent: 4293137 (1981-10-01), Ezekiel
patent: 4407508 (1983-10-01), Raj et al.

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