Bearings – Rotary bearing – Antifriction bearing
Patent
1994-08-12
1996-08-13
Cummings, Scott W.
Bearings
Rotary bearing
Antifriction bearing
384486, F16C 3378, F16J 1532
Patent
active
055449638
ABSTRACT:
A seal assembly interposed annularly between the inner and outer rings of a bearing assembly to seal an annular cavity formed between the inner and outer rings of the bearing assembly, the seal assembly having an annular seal member fitted onto the inner peripheral surface of the outer ring, a first annular seal lip, and a second annular seal lip, the first annular seal lip being in elastic-contact with the sidewall of an annular groove formed in the inner peripheral surface of the inner ring. The first annular seal lip has a radial length and an axial thickness satisfying a ratio (A/B) of the radial length (A) to the axial thickness (B), the ratio (A/B) being in the range of not less than 4.5 and not more than 7.0 to obtain a moderate rigidity capable of following the relative movement of the inner and outer rings. Communicating grooves are formed in the lower end portion of the first annular seal lip for communicating between the inside and outside of the bearing assembly, in order to prevent an increase in pressure within the bearing assembly because of a rise in temperature within the bearing assembly.
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Kajihara Kazuhisa
Kawamura Motoshi
Yanai Kunio
Cummings Scott W.
Koyo Seiko Co. Ltd.
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