Bearings – Rotary bearing – Antifriction bearing
Patent
1987-07-29
1988-09-13
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
384479, 277 3, 277 29, 277215, 277134, F16C 3378
Patent
active
047705485
ABSTRACT:
A hydrodynamic seal suitable for closing the end of a tapered roller bearing includes a seal case which is pressed into a counterbore at the end of the bearing cup and an elastomeric sealing element having a primary lip and secondary lip which cooperate with a sealing surface on the thrust rib of the bearing cone to effect a live seal along that surface. The primary lip is spaced from the sealing surface of the cone thrust rib and has pumping cavities which open both toward the sealing surface and toward the interior of the bearing. Moreover, they are configured to pump lubricant that enters them back toward the interior of the bearing. An annular space exists between the primary and secondary lips and the pumping cavities also open into this space at small vent apertures, so that any increase in pressure within the interior of the bearing is transmitted through the pumping cavitis to the annular space. The secondary lip actually contacts the sealing surface of the thrust rib, but is oriented oblique to that surface, so that a pressure increase transmitted to the annular cavity causes the secondary lip to lift slightly away from the sealing surface and relieve the increase in pressure.
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Asle Preprint #73AM-9B-1, "Birotational Seal Designs", 4-30-73.
ASME Publicattion "Zero Leakage" (no date).
Footland Lenard A.
The Timken Company
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