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A three-dimensional EHL analysis has been presented to investigate tribological performance of piston ring and cylinder liner contact. The average Reynolds equation and asperity contact approach are applied. For a more realistic simulation, the factors that have effects on the tribological performance of piston ring are considered as many as possible. The equation has been solved cyclically in a fully flooded inlet boundary condition and a flow-continuity Reynolds boundary condition for cavitation outlet zone. The results show that the elastic deformation and cylinder liner shape significantly affect the tribological performance of piston ring. A heat transfer model has been built to evaluate the effect of friction heat on the temperatures of piston ring pack and cylinder liner. The temperature fields can be acquired by the FEM. The results show that the friction heat mainly affects the temperature of region near the top ring groove.

Transient heat transfer computer program of the coupling 3-D moving piston assembly-lubricant film-liner system is successfully developed for predicting the distribution of temperatures in the component system, in which the finite element technology has been employed. The heat transfer relation of the moving piston assembly-lubricant film-liner has been established and 3-D discrete model of the system is obtained with the hypothesis of thinking the lubricant film as 1-D heat resistance. The discrete models of single component are assembled into the whole coupling model with the coupling theory. Some appropriate ways have been employed to deal with the moving arrays in the stiffness matrix because of the moving boundary conditions. The software has been employed to analyze a gasoline engine.