Abstract
Dr.-Ing. Eberhard Bock, Freudenberg Dichtungs- und Schwingungstechnik KG, Dipl.-Ing. Rolf Vogt and Dipl.-Ing. (FH) Peter Schreiner, Freudenberg Simmerringe KG The development of radial shaft seals for hydraulic pumps and motors is challenging. The mechanical and thermal loads exerted on the sealing lip increase dramatically as the pressure rises. As a result, the long operating life generally expected of these seals is often only obtained from leakage-generated lubrication, giving rise to a conflict of interests. This article examines the different pressure radial shaft seals currently available on the market, and describes the development of a seal with a sealing edge profile design that considerably extends its service life. The feature also presents a new seal concept which, in addition to introducing measures that improve lubrication by adding a special structural feature, increases the flexibility of the sealing lip by reducing the contact pressure.
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