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, Volume 78, Issue 7–8, pp 44–49 | Cite as

Analysis of the Tribology in the Piston Group Using an Optically Accessible Research Engine

  • Stefan WiggerEmail author
  • Torben Müller
  • Hans-Jürgen Füßer

Daimler has set up an innovative optical research engine with sapphire windows inserted into the cylinder wall. These windows provide a view of the piston side faces throughout the stroke at virtually all operating points. Due to the use of laser-induced fluorescence, the distribution of the lubricating oil in the piston group can be visualised, thus providing new insights into the associated tribology.

Sealing Function Versus Friction

The piston group of an internal combustion engine – consisting of piston and piston rings – is crucially important in the constant evolution of modern-day engines. This assembly comprises a complex system in relative motion, which seals the combustion chamber from the crankcase while the engine is moving. As such, the system has to resolve the conflict of objectives between optimising the sealing function and minimising friction losses. Figure 1shows effects that occur in the piston group and which influence each other. Modern-day, direct- injection...



Special thanks go to Dr. Thomas Behr for his hard work in carrying out the project. The authors would also like to thank Professors Christof Schulz and Sebastian Kaiser from the Institute of Combustion and Gas Dynamics at the University of Duisburg-Essen for their many helpful insights when designing the optical system.

Copyright information

© Springer Fachmedien Wiesbaden 2017

Authors and Affiliations

  • Stefan Wigger
    • 1
    Email author
  • Torben Müller
    • 2
  • Hans-Jürgen Füßer
    • 3
  1. 1.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  2. 2.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  3. 3.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany

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