Ferrofluid rotary-shaft seal apparatus and method

Details Ferrofluid rotary-shaft seal apparatus and method Ferrofluid rotary-shaft seal apparatus and method

1980-11-19

1982-11-02

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 80, 277135, F16J 1540

Patent

active

043570224

ABSTRACT:
A ferrofluid rotary-shaft seal apparatus of extended seal life particularly adapted for use as an exclusion seal with a computer-disc-drive spindle, which seal apparatus comprises: an annular permanent magnet; first and second pole pieces of unequal width, one end of each pole piece extending into a close, noncontacting relationship with the surface of the shaft, to form a gap width between the one end of the pole piece and the surface of the shaft; and ferrofluid in the gap widths to form a ferrofluid O-ring seal, whereby, in operation, the ferrofluid, under the thinner pole piece, evaporates and forms an air gap, while the ferrofluid at the wider gap width provides extended seal life.

REFERENCES:
patent: 4304411 (1981-12-01), Wilcock et al.

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