重卡六缸内燃机曲轴不同位置角静力学分析与结构优化  

Static analysis and structural optimization of heavy truck six-cylinder internal combustion engine crankshaft at different position angles

作　　者：朱帅伦 陈书童 王海啸 袁伟 郭前建[1] 池宝涛 ZHU Shuailun;CHEN Shutong;WANG Haixiao;YUAN Wei;GUO Qianjian;CHI Baotao(School of Mechanical Engineering,Shandong University of Technology,Zibo 255049,China;Shandong Luoxiang Automobile Manufacturing Postdoctoral Research Institute,Linyi 276211,China)

机构地区：[1]山东理工大学机械工程学院,淄博255049 [2]山东锣响汽车制造有限公司博士后工作站,临沂276211

出　　处：《现代制造工程》2023年第1期127-132,共6页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(52075306);中国博士后科学基金面上项目(2021M702024,2022M712393);山东省重点研发计划项目(2019GGX104081,2019GGX104033)。

摘　　要：为研究内燃机曲轴在实际工况下不同位置角的应力应变分布特征,利用Creo软件建立材质为QT700-2的重卡直列六缸内燃机左式曲轴三维模型,根据内燃机实际受载情况对曲轴施加约束和载荷并进行静力学仿真。结果表明:曲轴上最大应力发生在曲轴轴颈与曲柄臂的过渡圆角处,连杆轴颈中心出现最大形变,工作过程中第4缸对应曲轴轴段部分的应力变化最大。据此对曲轴结构进行优化,将过渡圆角半径增加40%后,最大应力值减小了约10%;结合企业曲轴故障返修情况,发现优化之后减少了曲轴早期故障率,提高了内燃机曲轴的可靠性。In order to study the stress and strain distribution characteristics of internal combustion engine crankshaft at different position angles under actual working conditions,a three-dimensional model of left crankshaft of heavy truck in-line six-cylinder internal combustion engine with QT700-2 material was established by Creo software.According to the actual load situation of the internal combustion engine,constraints and loads were imposed on the crankshaft and static simulation was carried out.Experimental results are given to verify that the maximum stress on the crankshaft occurs at the transition fillet between the crankshaft journal and the crank arm,and the maximum deformation occurs at the center of the connecting rod neck.In the working process,the stress change of the crankshaft section corresponding to the fourth cylinder is the largest.Therefore,the crankshaft structure was optimized.After increasing the transition fillet radius by 40%,the maximum stress is reduced by about 10%.Combined with the repair of crankshaft failure in enterprises,it is found that the early failure rate of crankshaft is reduced and the reliability of internal combustion engine crankshaft is improved after optimization.

关 键 词：曲轴位置角 静力学分析 结构优化 过渡圆角 

分 类 号：TK423[动力工程及工程热物理—动力机械及工程]