Abstract:In order to study the coupling effect of bending vibration and lubrication for diesel engine crankshaft in the process of strengthening,based on crankshaft dynamics and lubrication theory,considering the elastic deformation of the crankshaft and bearing,the calculation model of 12 cylinder diesel engine crankshaft was built.The coupling relationship between main shaft neck bending vibration and the minimal oil film thickness was analyzed,and the effects of bearing width,radius of main bearing clearance and the oil viscosity.The results show that there is a coupling relationship between bending vibration and the minimal oil film thickness,the minimum oil film thickness is opposite to the bending vibration,and the oil film can buffer the vibration.Within the research range,the oil film thickness is increased with the increase of the main bearing width and oil viscosity,and the bending vibration is decreased accordingly.The radius clearance of the main bearing has a great influence on lubrication and vibration,and the oil film thickness will increase when the clearance value is appropriately increased.However,while the clearance value is too large,the vibration impact of the shaft neck will increase and the minimum oil film thickness will decrease.The research results provide a reference for the prediction and control of crankshaft lubrication and vibration in the process of diesel engine strengthening design.