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Experimental Analysis of Dynamics and Friction in Valve Train Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
Annotation ability available
The paper analyses the friction in the valve train of an internal combustion engine trying to separate the contribution of the different components to the total friction losses in the valve train. The measurements are performed on a running engine in order to avoid extraneous factors introduced by simulating rigs. The experimental engine is instrumented with strain gauge bridges on the rocker arm, the push rod and the camshaft to measure forces and moments acting on these components. Original techniques are developed to isolate and determine the friction forces between the valve stem and its guide, the friction force in the rocker arm bearing and the combined friction between cam/tappet and tappet/bore. It was found that the friction in the rocker arm bearing never reaches hydrodynamic conditions and that the friction coefficient between cam and tappet reduces with an increase in the engine speed.
CitationTeodorescu, M., Taraza, D., Henein, N., and Bryzik, W., "Experimental Analysis of Dynamics and Friction in Valve Train Systems," SAE Technical Paper 2002-01-0484, 2002, https://doi.org/10.4271/2002-01-0484.
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