Fettabdichtung

FKM 2009
Booklet No. 302
Project No. 275

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Abstract:

Radial shaft seals (RWDR) are frequently used sealing elements in mechanical engineering, mostly to seal oil. Due to increased demands on machines, liquid oils are increasingly
being replaced by consistent lubricating greases. Oil-sealing systems have been extensively researched and have been used successfully in practice for decades. However, lubricating greases behave completely differently to oils. The knowledge for oils is therefore not directly transferable. There is hardly any specialized knowledge for grease-sealing systems. The consequences are
costly and inexplicable failures in industrial practice. In this research project, grease-sealing RWDRs were examined with regard to their application limits and the favorable design of the sealing point. The components of the sealing system were varied: sealing ring, lubricating grease, sealing ring running surface and installation environment as well as the operating parameters: Circumferential speed and temperature. The result is reliable knowledge about the influence of the individual components on friction, wear, sealing quality, service life and reliability. The result is a first practical guide that enables the design and assessment of RWDR sealing systems optimized for lubricating greases. The application limits can now be estimated much better. The research work has clearly shown that there is great potential for improvement. Lubricating greases can be reliably sealed with RWDR within wide limits. Front-side grease, reduced contact pressure, a narrow sealing edge and relatively rough sealing ring running surfaces proved to be particularly favorable. However, the right choice and combination of the individual components of the sealing system is crucial here. The informative final report describes in detail what must be observed and what special attention lubricating greases require. The objective of the research project was achieved.
Scope of report:
181 pages Start of work:
01.10.2005 End of work:
30.09.2008 Funding body:
BMWi / AiF-Nr. 14603 N Research center:
Institute for Machine Elements (IMA), University of Stuttgart Head:
Prof. Dr.-lng. B. Bertsche Editor and author:
Dipl.-lng. Pat.-Ing.W. Dürnegger Chairman of the working group:
Dr.-lng. D. Frey, ZF Friedrichshafen AG Chairman of the advisory board:
Dipl.-lng. H. Linn, LINN HIGH THERM GmbH, Hirschbach