计入机体和曲轴变形的曲轴轴承弹流润滑分析  

Analysis of Elastohydrodynamic Lubrication of Crankshaft Bearing Considering Deformation of Engine Block and Crankshaft

作　　者：孙军[1] 蔡晓霞[1] 刘利平[1] 桂长林[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230009

出　　处：《内燃机学报》2010年第3期275-280,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(50575065;50975073);清华大学摩擦学国家重点实验室开放基金资助项目(SKLTKF08B05);安徽省自然科学基金资助项目(090414171)

摘　　要：针对某4冲程4缸内燃机曲轴-轴承系统,考虑曲轴受载变形的情况,进行了计入整体机体变形的曲轴轴承弹性流体动力润滑分析。计算中采用动力学法进行曲轴轴承的润滑分析,采用变形矩阵法计算油膜压力作用下轴承表面的变形。结果表明,在考虑曲轴变形的情况下,与不考虑机体变形影响的结果相比,计入机体变形影响时一个工作周期内轴承的最大油膜压力减小、最小油膜厚度增加、润滑油流量和轴颈摩擦系数变化不明显。研究中计算轴承表面变形时分别采用了整体机体模型和单个轴承座模型,结果表明应用简单的单个轴承座模型计算轴承表面变形进行曲轴轴承弹性流体动力润滑分析基本可以满足工程计算精度要求。Analysis of elasto-hydrodynamic lubrication of crankshaft bearings considering deformation of whole cylinder block and crankshaft under load were carried out on the crankshaft-bearing system of a fourstroke four-cylinder internal combustion engine. Lubrication of crankshaft bearing was analyzed by dynamic method. Deformation of bearing surface under pressure of oil film was calculated by deformation matrix method. The results show that when deformation of crankshaft is considered, compared with those without considering deformation of cylinder block, the maximum film pressure is decreased, the minimum film thickness is increased, and the end flow-rate and journal frictional coefficient vary little over engine working cycle when considering deformation of cylinder block. The models of whole cylinder block and single bearing house were used to calculate deformation of bearing surface. Results show that engineering calculation accuracy of elasto-hydrodynamic lubrication of crankshaft bearings can be met basically by applying the model of simple single bearing house to calculate the deformation of bearing surface.

关 键 词：润滑 弹流 轴承 变形 曲轴 机体 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]