Abstract: In order to analyze the influence of given film pressure distribution of bearing used generally as load acted on journal in present calculation of crankshaft strength on the calculating precision, on the basis of lubrication analysis of bearing considering crankshaft deformation, the stress and strength of crankshaft are calculated when gained film pressure distribution status of bearing is used as boundary condition of load. The crankshaft deformation and bearing load are calculated by whole crankshaft beam-element method. The lubrication of crankshaft bearing is analyzed by kinetics method. The crank-shaft stress is calculated by finite element method. The results show that when the effect of crankshaft deformation under load is considered, the offset distribution of film pressure of bearing appears and the maximum film pressure increases remarkably, which result in the stresses of local area on surface of journal circular bead of crankshaft increase obviously and the safety factor of crankshaft decreases. Therefore, in order to make crankshaft design more reasonable and close to the factual con-dition, the crankshaft-bearing system should be taken as the study object when calculating crankshaft strength, and the loads on crankshaft journal should be calculated by factual lubrication analysis of bearing.

Key words: Bearing, Crankshaft, Deformation, Internal combustion engine, Lubrication, Strength