轴瓦轮廓修形对发动机连杆轴承磨损性能的影响  

Effects of Shell Profile Modification of Engine Conrod Bearings on Lubrication Characteristics

作　　者：阮登芳[1,2] 陈黎[2] 高真超 RUAN Dengfang;CHEN Li;GAO Zhenchao(State Key Laboratory of Mechanical Transmission, Chongqing University,Chongqing,400044;School of Automotive Engineering, Chongqing University, Chongqing,400044)

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044 [2]重庆大学汽车工程学院,重庆400044

出　　处：《中国机械工程》2019年第10期1207-1211,1218,共6页China Mechanical Engineering

基　　金：重庆市基础与前沿研究计划资助项目(CSTC2016JCYJA1304)

摘　　要：为了消除发动机连杆轴承在做功行程中两端出现的偏磨损,减少轴承的摩擦功耗,建立了某发动机曲轴系柔性多体动力学分析模型并进行了动力学仿真计算。根据连杆轴瓦内孔变形量仿真结果对轴瓦表面轮廓进行了修形设计。计算结果表明:对轴瓦轮廓修形后,轴承的润滑性能变化较小,最大油膜压力及最小油膜厚度随曲轴转角的变化趋势及数值大小均与原圆柱轮廓基本接近,消除了做功行程中的轴瓦偏磨问题,轴承的粗糙接触摩擦功耗无论是最大值还是平均值均降低,轴瓦表面粗糙接触压力沿轴瓦宽度方向分布均匀。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.

关 键 词：连杆轴承 轴瓦 轮廓修形 磨损 润滑性能 

分 类 号：TH117.1[机械工程—机械设计及理论]