Memory storage apparatus having vibration-dampened base plate arrangement Patent #: 4491888
ApplicationNo. 06/569189 filed on 01/09/1984
US Classes:360/99.08, Rotational drive detail277/410, Magnetic377/80, Parallel clocking384/478Centrifugal loading or slinging; fluid seal
ExaminersPrimary: Heinz, A. J.
Attorney, Agent or Firm
International ClassesF16C 33/78 (20060101)
F16C 33/76 (20060101)
F16J 15/40 (20060101)
F16J 15/43 (20060101)
G11B 33/14 (20060101)
G11B 19/20 (20060101)
AbstractA bearing assembly with an integrated single-stage ferrofluid seal apparatus incorporated therein, which assembly comprises a bearing assembly having an inner and outer race to define a raceway, a plurality of rolling elements retained within the raceway to permit rotation of the inner and outer races relative to one another, and a single-stage ferrofluid seal apparatus within the raceway and adjacent one side of the roller elements and which ferrofluid seal apparatus comprises a single-pole piece which extends into a close, noncontacting relationship with the surface of the inner or the outer race to define a radial gap, ferrofluid in the radial gap to form a ferrofluid seal, and an annular, permanent magnet secured to and adjacent the single-pole piece, the magnet having a generally-L sectional shape and in contact with one side and about one end of the pole piece to provide both a source of magnetic flux and as a magnetically insulating housing for the pole piece.