| 摘要 |
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. The oil retention portion comprising a generally annular, flexible primary hydrodynamic sealing lip portion disposed, in use, in a generally facing relation to the second element and defined by at least partially converging first and second, at least partially axially undulating frustoconical lip surfaces meeting each other along an axially undulating seal band area formed at the convergence of the undulating lip surfaces.
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