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Effect of oil film temperature on lubrication characteristics of piston ring in internal combustion engines
Published July 13, 1999 by Society of Automotive Engineers of Japan in Japan
The effects of oil film temperature on lubrication characteristics of the piston ring of internal combustion engines are investigated. The lubrication characteristics (oil film thickness and friction force) are analyzed by Reynolds equation considering oil film temperature. The oil film temperature is calculated by using 2-D energy equation considering the ring profile and the heat generated from the viscous dissipation. The oil film temperature distributions are influenced by the viscosity, wall velocity, oil film thickness and thermal boundary conditions (wall temperature, inlet and outlet temperatures). The viscosity of oil film decreases with the increase of the oil film temperature caused by the viscous dissipation. The effects of oil film temperature variation on lubrication characteristics between the piston ring and the liner are clarified.