Ferrofluid rotary-shaft seal apparatus and method

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

F - Mech Eng,Light,Heat,Weapons

16

J

277/49

F16J 15/40 (2006.01) F16J 15/43 (2006.01) G11B 33/14 (2006.01)

Patent

CA 1158684

ABSTRACT OF THE DISCLOSURE A single-stage, ferrofluid, rotary-shaft seal apparatus of extended seal life is particularly adapted for use as an exclusion seal with a computer-disc-drive spindle. The seal apparatus comprises: an annular permanent magnet; first and second pole pieces of identical width, having an L-shaped, cross- sectional configuration at the one end thereof, with the one end thereof extending into a close, noncontacting relationship with the surface of the shaft to form a defined radial gap, while the inside diameter of the projection at each end forms an interstage region; and a ferrofluid retained by magnetic flux in the radial gap and interstage region, to form a single-stage, ferrofluid, O-ring seal on the surface of the shaft.

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