RV减速器可靠性研究与关键件疲劳可靠性分析

发布时间：2018-03-31 13:03

本文选题：RV减速器　切入点：可靠性建模　出处：《北方工业大学》2017年硕士论文

【摘要】：RV减速器是结合行星传动和巧妙地利用曲柄轴实现摆线传动的减速器,具有结构紧凑、过载能力强和可靠性高等优点。目前国内的RV减速器仅处于研究生产阶段,其主要原因是国内生产的RV减速器存在传动精度低、振动噪声大和寿命短等缺点,另外,国内对RV减速器可靠性的探索研究相对较少,且针对RV减速器可靠性方面的理论并不完善,因此,RV减速器可靠性研究对促进其发展有十分重要的工程意义。首先,利用Pro/ENGINEER建立RV减速器各个简化零部件的模型,并根据其相应的位置关系完成装配和相关的检验,然后采用ANSYS Workbench对RV减速器行星齿轮、摆线轮和滚动轴承进行几种特殊工况下的瞬态动力学分析,并以此进一步对其进行疲劳寿命分析,为其寿命预测提供了理论基础。其次,建立RV减速器关键件的结构可靠性计算模型,并完成行星齿轮、摆线轮和滚动轴承的可靠度计算。通过结果可知,行星齿轮和摆线轮的可靠性相对较高,不容易发生损坏,曲柄轴处的滚针轴承受力最大,其可靠度最低,因此,滚针轴承可靠性的高低直接制约着整机的可靠性。再次,利用故障树分析法寻找RV减速器主要构件的故障模式,以RV减速器失效为顶事件建立故障树,分析RV减速器的薄弱环节和影响其正常工作的相关因素,同时,将RV减速器整机故障状态与各零部件的故障状态利用逻辑关系有机地联系在一起,大大提高了分析效率。最后,基于现有的条件设计RV减速器综合试验方案,选择合理的RV减速器失效判据,为RV减速器可靠性试验奠定理论基础。
[Abstract]:RV reducer is a reducer which combines planetary transmission and cleverly uses crank shaft to realize cycloidal transmission. It has the advantages of compact structure, strong overload ability and high reliability. At present, RV reducer in China is only in the stage of research and production. The main reason is that the RV reducer produced in our country has the disadvantages of low transmission precision, high vibration and noise, short life and so on. In addition, there are relatively few researches on the reliability of RV reducer in our country. The reliability theory of RV reducer is not perfect, so the research on reliability of RV reducer is of great engineering significance to promote its development. Firstly, the model of each simplified parts of RV reducer is established by using Pro/ENGINEER. According to the corresponding position relation, the assembly and related inspection are completed, and then ANSYS Workbench is used to analyze the transient dynamics of RV reducer planetary gear, cycloid wheel and rolling bearing under several special working conditions. Furthermore, the fatigue life of RV reducer is analyzed, which provides a theoretical basis for its life prediction. Secondly, the structural reliability calculation model of the key parts of RV reducer is established, and the planetary gear is completed. The reliability calculation of cycloidal gear and rolling bearing. The results show that the reliability of planetary gear and cycloid wheel is relatively high and it is not easy to be damaged. The needle roller bearing at the crank shaft has the greatest force and its reliability is the lowest. The reliability of needle roller bearings directly restricts the reliability of the whole machine. Thirdly, the fault tree is established by using the fault tree analysis method to find the fault mode of the main components of the RV reducer, taking the failure of the RV reducer as the top event. The weakness of RV reducer and the related factors affecting its normal operation are analyzed. At the same time, the logic relation between the fault state of the whole RV reducer and the fault state of the parts and components is organically linked together, which greatly improves the efficiency of the analysis. Based on the existing conditions, the comprehensive test scheme of RV reducer is designed, and a reasonable failure criterion of RV reducer is selected, which lays a theoretical foundation for reliability test of RV reducer.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH132.46

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