A Comprehensive Investigation of the Friction and Lubrication Properties of Piston Ring Pack

Based on the two dimensional average flow model and the asperity contact model, a theoretical model for the non axisymmetrical analysis of piston ring lubrication has been suggested. The oil film thickness is measured and the theoretical result is consistent with the experimental one. The three dimensional distribution of oil film thickness between piston rings and cylinder wall is obtained. Results show that the oil film thickness along the circumference is non uniform. Starvation is also considered in the model. The effect of secondary motion of piston assemblies on the lubrication property of piston ring pack has been studied as well.