Importance

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Abstract

A seal suitable for closing the annular space between the races of an antifriction bearing includes a case which fits into the outer race and a shield that fits over the inner race. Both the case and shield have axial and radial walls that enclose a cavity within the seal. The seal also includes an elastomeric seal element which is bonded to the radial wall of the case and includes a lip which extends obliquely into the cavity and toward the axial wall of the case which it contacts to create a dynamic barrier. The shield also has an outer radial wall that encircles the inner radial wall and extends along the axial wall of the case such that a small gap exists between the outer axial wall of the shield and the axial wall of the case. The outer axial wall of the shield is either out of round or eccentric with respect to the inner axial wall, so that the size of gap varies circumferentially along the gap. As a consequence of this variance, the seal will pump fluent contaminants, such as water. Under static conditions the fluent contaminants drain from the cavity through the gap.

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First Claim