Lubrication Performance of Connecting-Rod and Main Bearing in Di erent Engine Operating Conditions

作     者：Jun Sun Biao Li Shaoyu Zhu Enming Miao Hu Wang Xiaoyong Zhao Qin Teng 

作者机构：School of Automotive and Transportation Engineering Hefei University of Technology School of Mechanical EngineeringHefei University of Technology School of Instrument Science and Opto-electronics Engineering Hefei University of Technology 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2019年第32卷第2期

页      面：81-92页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：Supported by Science Fund of State Key Laboratory of Engine Reliability of China(Grant No.skler-201708) National Natural Science Foundation of China(Grant No.51490660/51490661) 

主　　题：Lubrication Connecting-rod bearing Main bearing Engine Operating condition 

摘      要：Only the lubrication performance at rated engine operating condition was generally analyzed in current design and research of engine connecting-rod and main bearing. However, the actual engine(especially vehicle engine) does not always operate in rated operating condition and its operating condition changes constantly. In this paper, a fourstroke four-cylinder engine is taken as the studying object, the load and lubrication of connecting-rod and main bearing in di erent operating conditions are analyzed. The load of connecting-rod bearing is calculated by the dynamic calculation method, the loads of all main bearings are calculated by the whole crankshaft beam-element finite element method, and the lubrication performance of connecting-rod and main bearings are analyzed by the dynamic method. The results show that there are major di erences in the changes and numerical value at corresponding moment of the loads and lubrication performance of connecting-rod and main bearings in an engine operating cycle in di erent engine operating conditions; the most unfavorable case of the lubrication performance of connectingrod and main bearings may not take place in the rated engine operating condition. There are also major di erences between the lubrication performance of connecting-rod bearing and that of main bearing and between the lubrication performances of main bearings one another. Therefore, it will not be reasonable that the lubrication performance of a certain connecting-rod bearing or main bearing is analyzed in the design of the engine bearing. It is necessary to analyze simultaneously the lubrication performances of all bearings in di erent engine operating conditions.