Abstract:Due to wear,fatigue crack,erosion and oil grooves during operation,the grooves may be formed on the journal bearing,which will affect bearing lubrication.The theoretical model of journal bearing was established based on the Reynolds equation,and the oil film thickness and pressure distribution in the process of bearing lubrication were obtained by numerical simulation.The effects on bearing lubrication state parameters by groove shape as well as groove parameters of circumferential width,circumferential distance and groove depth were investigated.The results show that rectangular grooves have biggest influence on bearing lubrication.The influences of groove parameters on lubrication state between inlet zones and outlet zones are not the same.In the inlet zone of lubricating oil,with the increasing of circumferential width and circumferential distance,the bearing loading capacity is decreased and the coefficient of friction is increased,while in the outlet zone of lubricating oil,the bearing loading capacity is increased and the coefficient of friction is decreased.The influence of groove depth on bearing lubrication is not obvious in the outlet zone of lubricating oil,while in the inlet zone,the increasing of groove depth will result in the decreasing of bearing loading capacity and the increasing of coefficient of friction.