Sealing apparatus
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United States of America Patent
Stats
-
Sep 18, 2001
Grant Date -
N/A
app pub date -
Sep 17, 1999
filing date -
Jan 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sealing apparatus which is disposed between the media side and the bearing side and adapted to hermetically seal members rotating concentrically relative to each other, wherein a passageway having in a U-shaped cross section is formed by an outer shielding member on the media side, an outer shielding member on the bearing side and an inner shielding member, the end portion of which is inserted into the cavity between the outer shielding members. The end portion of the inner shielding member has a T-shape or L-shape. A magnet is arranged at either the inner shielding member or the outer shielding member. A ferrofluid is retained in the cavity by the surrounding magnet. An oil repellent material may be coated on the surface of the inner shielding member except for a portion extending into the cavity and an adhered portion on its inner diameter side.
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