关键词: 连杆轴承, 轴瓦, 轮廓修形, 磨损, 润滑性能

Abstract: To solve the shell edge wear of engine conrod bearings and reduce the asperity contact power losses, a flexible multi-body dynamics analysis model of engine crankshafts was established and a dynamics simulation calculation was carried out. According to the simulation results of the deformations of inner diameters of conrod bearing shells, the contours of bearing surfaces were modified. The simulation results show that after the shell profiles of conrod bearings were modified, the lubrication performances change less and the lubrication performances including the maximum oil film pressures and minimum oil film thicknesses are basically the same as those of the original bearings with cylindrical shell profiles, but the shell edge wear problems in the work strokes are solved, either the maximum values or average values of the asperity friction power losses are reduced and the asperity contact pressures are distributed uniformly along the axial directions of the conrod bearing shells.

Key words: conrod bearing, bearing shell, profile modification, wear, lubrication performance