摩托车发动机正时链的疲劳性能研究

发布时间：2018-03-03 07:27

本文选题：正时链　切入点：疲劳性能　出处：《吉林大学》2012年硕士论文　论文类型：学位论文

【摘要】：随着整车对发动机性能要求的不断提高，以及链条技术的快速发展，，正时链被越来越广泛地应用到汽车、摩托车的发动机正时系统中。对于发动机正时系统的闭式传动而言，链条的疲劳性能成为系统使用可靠性的最关键影响因素。为了深入研究目前正广泛应用的正时套筒链以及极具发展潜力的正时齿形链的疲劳特性，本课题选取目前国内摩托车发动机正时系统中应用最典型的04MA套筒链和CL04-5齿形链两种链条为研究对象，采取随机抽样的方法，从国内具有代表性的链条制造厂抽取充足的试验样品，在对这两种链条样品依据相关标准进行常规检验、疲劳指标符合性验证试验的基础上，比较分析了两种链条的比重参数、静强度和疲劳性能指标的差异与优劣。为了进一步摸索两种链条的疲劳特性规律，本课题还采用成组法和升降法进行了疲劳性能试验，获取大量试验数据。对试验数据进行处理和置信度评价后，绘制两种链条完整的疲劳曲线，得到了疲劳曲线直线段部分回归方程的解析表达式和平均疲劳强度。此外，利用有限元软件ANSYS对CL04-5齿形链进行了建模和仿真，分析了链板在载荷作用下的应力分布状况，并提出了通过改变齿形链链板的非关键性尺寸参数—内档高度来提高齿形链疲劳性能的可行性。本文通过理论分析和试验研究，得出了以下结论：04MA套筒链和CL04-5齿形链两种链条在比重基本相同的情况下，静强度指标均能满足各自标准规定的要求；CL04-5齿形链的静强度水平高于04MA套筒链约21%；两者的疲劳性能在动载荷较低、试验频率基本相同的条件下，CL04-5齿形链的平均疲劳强度优于04MA套筒链9%，在动载荷较高条件下，04MA套筒链的疲劳性能最高优于CL04-5齿形链10%等有价值的结论。该课题的研究成果不仅摸索出两种正时链的疲劳特性规律，为我国发动机正时链技术水平的提高做了有意义的技术基础研究工作，而且也对我国两种正时链产品的疲劳性能评价指标的确定和评价体系的建立提供了技术支撑。
[Abstract]:With the continuous improvement of vehicle performance requirements and the rapid development of chain technology, timing chain is more and more widely used in the engine timing system of automobiles and motorcycles. The fatigue property of the chain is the most important factor affecting the reliability of the system. In order to study the fatigue characteristics of the timing sleeve chain and the chronochronous tooth chain, which are widely used at present, In this paper, two kinds of chains, 04MA sleeve chain and CL04-5 toothed chain, which are used in the domestic motorcycle engine timing system are selected as the research objects, and the method of random sampling is adopted. Sufficient test samples were taken from representative chain manufacturers in China. The specific gravity parameters of the two kinds of chains were compared and analyzed on the basis of routine test and fatigue index compliance verification test according to the relevant standards of the two kinds of chain samples. The difference of static strength and fatigue performance index. In order to further explore the fatigue characteristics of the two kinds of chains, the fatigue performance tests were carried out by group method and lifting method, and a large number of test data were obtained. After processing the test data and evaluating the confidence degree, The complete fatigue curves of two kinds of chains are drawn, and the analytical expressions and average fatigue strength of partial regression equations of linear segments of fatigue curves are obtained. In addition, the finite element software ANSYS is used to model and simulate the CL04-5 toothed chain. The stress distribution of the chain plate under load is analyzed, and the feasibility of improving the fatigue performance of the tooth chain by changing the non-key dimension parameter of the chain plate is put forward. Based on theoretical analysis and experimental study, the following conclusions are drawn in this paper: 1. 04MA sleeve chain and CL04-5 toothed chain have the same specific gravity. The static strength index can meet the requirements stipulated in their respective standards. The static strength level of CL04-5 toothed chain is higher than that of 04MA sleeve chain about 21. The fatigue properties of both chains are lower in dynamic load. The average fatigue strength of CL04-5 toothed chain is better than that of 04MA sleeve chain under the condition of the same test frequency, and the fatigue performance of 04MA sleeve chain is better than that of CL04-5 tooth chain 10% under higher dynamic load. The results not only find out the fatigue characteristics of two time chains, It also provides technical support for the determination of fatigue performance evaluation index and the establishment of evaluation system for two kinds of timed chain products in China.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.45

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