The function of the system valve stem - valve guide is dependent on the material combination and the available amount of oil. The wear on both components must be low at high running times to ensure a save function and keep the emission of the engine low. The knowledge about the friction- and wear mechanism is not obviously caused by missing information about the real amount of oil in the guide and over the oil transportation.This paper describes, in which way it is possible to visualize the valve behavior in a valve guide. Two test rigs with valve guides made out of glass are built up to investigate the behavior of the valve under running conditions. This research work realized for the first time, taking photographs of the oil distribution in a original scaled valve guide under running conditions.The following could be visualized: In this paper fundamental knowledge for understanding the system valve stem - valve guide are described.
Optical Ways to Improve the Tribology of Valve Guides
Sae Technical Papers
SAE 2005 World Congress & Exhibition ; 2005
2005-04-11
Conference paper
English
Optical ways to improve the tribology of valve guides
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