内燃机连杆大端轴瓦微动磨损及疲劳研究  

A Study on Fretting Wear and Fatigue of Connecting Rod Big End Bearing of Internal Combustion Engines

作　　者：李云强 王一[2] 黄日宁 赵奎奎 崔毅[2,3] Li Yunqiang;Wang Yi;Huang Rining;Zhao Kuikui;Cui Yi(Weichai Power Company Limited,Weifang 261061,China;Key Laboratory of Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China)

机构地区：[1]潍柴动力股份有限公司,山东潍坊261061 [2]上海交通大学动力机械与工程教育部重点实验室,上海200240 [3]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《内燃机学报》2021年第6期561-568,共8页Transactions of Csice

基　　金：内燃机可靠性国家重点实验室基金资助项目(skler-201710).

摘　　要：随着发动机轻量化和强化程度不断提高,由于零部件刚度不足导致的部件接触面之间的微动磨损现象更为突出,对零部件和整机的可靠性产生较大影响.针对易于发生微动现象的连杆大端轴瓦瓦背接触面,建立微动磨损和疲劳三维仿真模型并进行验证.为避免在微动磨损仿真过程中的网格畸变导致的收敛问题,采用任意拉格朗日-欧拉(ALE)方法进行磨损分析.根据发动机连杆实际工作状态,设计连杆微动试验装置,并针对连杆大端轴瓦瓦背接触面进行32 h连续微动试验,试验结果与仿真模型预测结果相吻合.最后,基于仿真计算,分析轴瓦初始过盈量与连杆螺栓预紧力对轴瓦瓦背上微动磨损、微动疲劳的影响,并给出相应的优化建议.With the improvement of lightweight and power density of internal combustion engines,the fretting damage between the contact surfaces is more prominent due to the insufficient stiffness of parts,which has a great impact on the reliability of parts and engines.A three-dimensional fretting wear and fatigue simulation model was established and verified for the contact surfaces between the bore and bearing bush of the connecting rod big end,which is prone to fretting damage.In order to avoid the non-convergence problem caused by mesh distortion in fretting simulation,the arbitrary Lagrangian-Euler(ALE)method was used to adjust the element nodes.According to actual working status of the engine connecting rod,a fretting test bench was established.A 32-hour continuous fretting experiment was then carried out on the bench.The experimental results are found to be in good agreement with the predicted results.In the end,the effects of initial interference of bearing bush and bolt pre-load of the connecting rod on fretting wear and fatigue on the back of the bearing bush were analyzed.In order to reduce fretting wear and increase fretting fatigue life of the bearing bush,corresponding optimization suggestions were also proposed according to the simulation results.

关 键 词：内燃机 微动磨损 微动疲劳 任意拉格朗日-欧拉方法 有限元方法 轴瓦瓦背 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]