Abstract: A unitized, fluid seal assembly for heavy duty applications. The seal assembly includes a primary seal unit, an annular wear sleeve, and a separately formed thrust bumper made from a stiff but resilient, high temperature resistant, lubricous plastic material. The thrust bumper has a body with opposed, tapered surfaces meeting to define a narrow band that contacts the radial end face of a radial flange on the wear sleeve or the primary seal casing. The primary seal unit includes an elastomeric seal body with primary and excluder lips, and the wear sleeve includes an additional excluder lip contacting a portion of the primary seal casing.

Abstract: A seal assembly for creating a fluid seal between first and second, relatively movable elements, at least one of which is arranged for rotation about a given axis. The seal has a mounting portion thereof adapted to be fixedly associated in use with said first element, a dirt exclusion portion and an oil retention portion. The dirt exclusion portion has a plurality of annular excluder lips, and the excluder lips, as manufactured, extend radially inwardly and are spaced axially apart from each other. The lips also have an inside diameter substantially smaller than that of said second relatively movable element, and the excluder lips, in position of use, contact and lie along the second element, as installed, the lips are flexed so that the inner portions thereof extend radially inwardly as well as axially away from the region to be sealed.