摘要
为解决某柴油机试验开发阶段凸轮轴疲劳断裂的问题,利用有限元方法对凸轮轴进行多体动力学仿真计算,并对凸轮轴各部位进行动态载荷、瞬态动力学及高周疲劳分析。分析结果表明:凸轮轴强度满足设计要求;凸轮轴前端(第一缸)排气凸轮轴肩过渡圆角处的疲劳安全因数最小,为1.2,虽满足设计要求,但接近临界值。将凸轮轴前端排气凸轮轴肩过渡圆角半径由3 mm增大为5 mm,有效解决了凸轮轴疲劳断裂故障。
In order to solve the problem of fatigue fracture of a camshaft during the experimental development stage of a diesel engine,the finite element method is used to perform multi-body dynamic simulation calculations on the camshaft.Dynamic load,transient dynamics,and high cycle fatigue analysis are conducted on various parts of the camshaft.The analysis results show that the strength of the camshaft meets the design requirements.The fatigue safety factor at the transition fillet of the exhaust camshaft shoulder at the front end of the camshaft(first cylinder)is 1.2,which is the smallest,although the strength of the fracture site meets the design requirements,it is approaching the critical fatigue safety factor.By increasing the transition radius of the exhaust camshaft shoulder at the front end of the camshaft from 3 mm to 5 mm,the problem of fatigue fracture of the camshaft has been solved.
作者
李德华
杨鹏
陈经伟
高坤
宫继儒
陈海瑞
LI Dehua;YANG Peng;CHEN Jingwei;GAO Kun;GONG Jiru;CHEN Hairui(R&D Center,Weichai Power Co.,Ltd.,Weifang 261061,China)
出处
《内燃机与动力装置》
2024年第5期92-95,共4页
Internal Combustion Engine & Powerplant
关键词
有限元
凸轮轴
动力学
疲劳安全因数
finite element
camshaft
dynamics
fatigue safety factor
