摘要
随着对车用柴油机功率密度和使用寿命要求不断提高,柴油机主轴承轴瓦背部由于长期承受较大交变载荷,会产生微动磨损,对零部件和整机的使用寿命产生较大影响。针对一款车用柴油机的主轴承-机体过盈接触面进行微动磨损研究,模拟实际工况载荷,对机体-主轴瓦接触副进行1 000万次动载加载试验,获取主轴承-机体接触面微动磨损情况,并对比不同螺栓预紧力对微动磨损的影响。建立机体-轴瓦接触仿真模型,结合微动磨损的Archard模型分析主轴承-机体的微动磨损规律并与试验结果进行对比。结果表明:仿真结果与试验吻合,最大磨损位置出现在上轴瓦边缘,增大螺栓预紧力会增大上轴瓦磨损同时减小下轴瓦磨损。进一步对螺栓预紧力和主轴承过盈的方案分析表明,最大磨损位置与螺栓靠近轴瓦导致应力应变过大有关,在一定范围内增加过盈量可以显著降低微动磨损。研究结果为减小轴承微动磨损提供了建议和参考。
Requirements for increasing power density and service life of vehicle diesel engines lead to fretting wear on the back of main bearing bush of diesel engine due to long-term large alternating load, which have a great effect on the service life of parts and engine. A dynamic load test of 10 million cycles was carried out on the contact pair of main bearing bush and engine block to obtain the state of fretting wear by simulating the actual working load and the influence of different bolt preloads on fretting wear was compared. According to the built simulation model of engine body and bearing bush contact pair and Archard model of fretting wear, the law of fretting wear was analyzed and compared with test result. The results show that the simulation results are in good agreement with the experiments. The most severe wear occurs at the edge of upper bearing bush and increasing the bolt preload leads to the increasing wear of upper bush and the decreasing wear of lower bush. The further analysis of bolt preload and main bearing interference shows that the location of most severe wear is related to the larger stress and strain caused by the bolt too close to the bearing bush and increasing the interference in a certain range can significantly reduce fretting wear. The results provide suggestions and references for reducing fretting wear of bearings.
作者
谷冉升
崔毅
程祥军
李云强
GU Ransheng;CUI Yi;CHENG Xiangjun;LI Yunqiang(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;Weichai Power Co.,Ltd.,Weifang 261001,China)
出处
《车用发动机》
北大核心
2020年第2期29-34,共6页
Vehicle Engine
基金
内燃机可靠性国家重点实验室基金(skler-201710)。
关键词
柴油机
轴瓦
微动磨损
减磨
diesel engine
bearing bush
fretting wear
wear reduction
作者简介
谷冉升(1995-),男,硕士,主要研究方向为磨损疲劳及可靠性;guransheng@126.com;通讯作者:崔毅(1971-),男,研究员,博士,主要研究方向为内燃机结构强度及可靠性;ycui@sjtu.edu.cn。
