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

043570232

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, one end of which pole pieces extends into a close, noncontacting relationship with the surface of the rotary shaft to form a gap therebetween; ferrofluid in the gap to form at least one O-ring seal; and a heat-conductive sheet material in a close, heat-conducting relationship with at least one pole piece, to aid in removing heat from the ferrofluid in the gap, thereby extending the seal-apparatus life in use.

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

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