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摘要发动机的曲轴连杆组是发动机最重要的部件之一，它承受着复杂的、变动的冲击载荷，是发动机设计的重点和难点，也是发动机性能评价的重要组成部分。因此要精确的对发动机的曲轴连杆组的运动做出精确的分析后，针对每个零件的受力特点和运动特点对零件进行设计。
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本论文针对汽车发动机的重要机构—曲轴连杆组进行了设计研究，通过分析，确定了机构的主要设计参数。在分析发动机燃烧过程的基础之上，获得了发动机工作全过程作用在活塞上的的输入载荷随曲柄转角变化的历程。根据求得的外载荷进行载荷组合，为结构强度设计提供了载荷计算依据。在完成结构设计的基础上，在对重要零件的公差与配合进行选择计算，并绘制出用于加工制造的图纸。20601
本毕业设计课题的研究与实施，应用和加深了本科学习期间的大部分理论知识，还获得了很多新的理论知识，更重要的是将理论与工程设计紧密结合，增强了分析问题和解决问题的能力，对知识的综合运用和解决工程中的实际问题，在能力上获得了很大的提高，并得到了全面的锻炼。
毕业论文关键词：汽车发动机，发动机设计，曲轴连杆组
Six-cylinder engine crankshaft, connecting rod and piston assembly design
The crankshaft-link group is one of the most important engine’s components, which sustains the complex and changeable impulse. It is the key point and difficulty of the engine design, and also an important part to eva luate engine’s performance. So after accurate analysis motion of the crankshaft-link group, the parts should be designed according to its characteristics of the force and movement.
Trough the analysis of the main design, the Main design parameter was determined, and the analysis model of the crankshaft-link group was established. Based On the analysis of engine combustion, people can observe input load of the piston changed with the change of the crank angle. And then combine the load according to the extra load which has been gained, so as to provide a basis of load computing for the design of structural strength. After the structural design, the tolerance and cooperation of the parts will be chosen and calculated. Finally, make a drawing of parts for the processing.
During the research, implementation and the application of this graduate program what I get not only the deep understanding of most theoretical knowledge which learn in undergraduate, but also acquire much new theoretical knowledge. And the most important is my theoretical knowledge is closely integrated with engineering design and it improve my comprehensive ability of problem-analyzing ,problem-solving and the comprehensive use of knowledge to resolve the practical problems in the processing.
Keywords: automobile engine, engine design, crank connected rod group
目录
1绪论 1
1.1汽车发动机的现状及发展前景 1
1.2现代发动机设计与技术发展 1
2发动机总体构造 2
2.1发动机主要设计指标 2
2.1.1 动力性指标 2
2.2 发动机的总体结构介绍 3
2.2.1 曲柄连杆机构的功用 3
2.2.2 曲柄连杆机构的总体组成 3
2.2.3 发动机机体组 4
2.2.4 发动机活塞连杆组 5
2.2.5 发动机曲轴飞轮组 6
2.2.6 发动机其他组成系统 7
2.3 发动机基本术语 8
2.4 四冲程汽油机基本工作原理 9
2.4.1 吸气冲程 9
2.4.2 压缩冲程 10
2.4.3 做功冲程 10