Stress Analysis in a Con-Rod Using Oil Film Pressure in a Bearing Calculated with Elasto-Hydrodynamic Lubrication

Abstract

A compliance matrix, which expresses the relation between bearing deformation and oil film pressure, is used in an elasto-hydrodynamic lubrication, EHL. The compliance matrix is derived with a structural analysis of a con-rod using design data of a 3D-CAD. Force distributions on the boundary of the con-rod are obtained from the oil film pressure on the bearing surface calculated with the EHL. Stress analysis is performed using the structural analysis in the 3D-CAD and the stress distributions in the con-rod are clarified over an engine cycle. The results under low and high engine speeds are shown in comparison with each other. Finally, the effect of engine speed on the stress distribution and the maximum stress is discussed.