Instantaneous Wear Prediction of Crankshaft Bearings of a Gasoline Engine at the Beginning of Real Firing Start-Up Cycle

This study on engine journal bearing wear is based on a simulation approach using the engine start-up condition. This study presents an attempt to predict the potential regions where a wear scar would occur on crankshaft bearings, and estimates the instantaneous wear volume for bearings operating at a variable angular velocity of a shaft at the beginning of the real firing start-up cycle. The potential wear regions are discovered by finding the minimum oil film thickness at every crank angle (CA) existing below most oil film thickness scarring wear (MOFTSW) obtained by the concept of the centerline average surface roughness (cla = R_a). The simulation results give an increased understanding of when and where a wear scar may occur in the journal bearings for the firing start-up condition.