【作者】 孙磊；

【导师】 杨福源； 张志福；

【作者基本信息】 清华大学 ， 动力工程（专业学位）， 2016， 硕士

【摘要】 随着排放、油耗法规的逐渐严苛,当代发动机设计逐渐倾向于轻量化、小型化。这使得发动机的密封面越发窄小,形状特异,密封面面积和螺栓压紧力受到制约,对发动机密封技术和密封材料提出了更高的需求。与此同时,客户对汽车质量的预期也逐步提高。密封不严导致的“漏水、漏油、漏气”问题逐步成为用户关心的要点,发动机密封性能也就成为评价汽车质量的重要指标之一。本课题以某款自主品牌量产的发动机为研究对象,在对其T型区机油密封性能进行有限元分析的基础上,跟据对机油渗漏问题进行失效机理分析结果,对比不同品牌发动机产品密封设计的差异,归纳出目前发动机密封设计的特性,优化该款在产发动机的密封结构设计,解决了T型区机油渗漏问题。本课题所研究的密封结构优化设计已得到应用,并通过台架耐久性试验验证和售后数据可靠性分析,证明了优化设计的有效性。更多还原

【Abstract】 With the more and more strict laws and regulations of emissions and fuel consumption,modern engine design increasingly tends to be lightweight and miniaturized,leading to the narrower engine sealing surface,specific shape,restricted sealing surface area and the bolt clamping force,which puts forward higher requirements for engine sealing technology and seaingl materials.At the same time,the users are expecting better quality of automobile products.The problem of water leakage,oil leakage and air leakage caused by untight sealing,has become the focus of users’ attention.And the engine sealing performance has become one of the important indexes to evaluate the quality of the car.This project takes mass-produced engine of self-owned brand as the research object.Based on the finite element analysis of its T-joint oil sealing performance and according to the failure mechanism analysis of the motor oil leakage problems,it compares different brands of engine product sealing design,summarizes the characteristics of the current engine sealing design,and optimizes the sealing structure design of the engine in production to solve the T-joint oil leakage problem.The optimal design of the sealing structure studied in the project has been applied and has been proved effective by the test of bench durability and the analysis of the reliability of the after-sale data.更多还原