Sealing and bearing means by use of ferrofluid

Details Sealing and bearing means by use of ferrofluid Sealing and bearing means by use of ferrofluid

1984-06-27

1986-07-08

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, 384133, F16J 1540, F16J 1554, F16C 3382

Patent

active

045989141

ABSTRACT:
Sealing and bearing means by use of ferrofluid, in which a magnet is utilized effectively in cooperation with grooves engraved on one surface thereof, the grooves having the function for generating the dynamic pressure of the ferrofluid. The ferrofluid is retained in a gap between a rotary shaft and a magnet of cylindrical or disc type enclosing the rotary shaft concentrically. The magnet performs excellent two functions of bearing and sealing respectively.

REFERENCES:
patent: 3746407 (1973-07-01), Stiles et al.
patent: 3834775 (1974-09-01), Tuffias et al.

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