吉林大学毕业生毕业设计-热能与动力工程四缸汽油机及活塞设计

摘要汽车行业自诞生起到现在 100 多年间，汽车工业从无到有，进展速度惊人，相关技术不断创新进展，逐渐走向成熟。到目前为止，汽车动力性和排放性是各国关注的焦点。而发动机作为汽车的心脏，是汽车中最重要的组成部分，改进发动机结构或者使用新型燃料是目前汽车改善其动力性和排放性的主要方向。所以充分熟悉发动机构造特点，进行改进设计是讨论开发发动机必不可少的环节。本设计以 1987 年中国第一汽车集团从美国克莱斯勒公司引进、由第一汽车集团生产的 CA488 系列发动机为例进行缩小缸径的改进设计，将 CA488缩小缸径改进成 CA485。通过对 CA485 发动机两大机构和四大系统的全面介绍，能够进一步了解汽油机的工作原理及其特点，从而对汽油机的内部构造进行全面的熟知。除此之外，本文还总结了国内外车用发动机进展现状，汽油机技术的进展趋势和汽车排放法规等内容。CA485 为直列四缸、四冲程、火花点火式发动机，并采纳顶置凸轮轴和齿形带正时等技术。关键词：汽油机，曲轴，连杆，飞轮，设计，活塞AbstractThe automotive industry since its birth until the present 100 years, the auto industry from scratch, developing at an alarming rate, related technology innovation and development, and gradually mature. So far, vehicle power and emissions is the focus of national attention. The engine as the heart of the car, the car is the most important part of improving the structure of the engine or the use of new fuel is currently the main direction of the car to improve its power and emission lines. So fully familiar with the internal structure of the engine, the engine improvements is an essential step in research.In this paper, in 1987 China First Automobile Group from the United States Chrysler introduced by the First Automobile Group production of CA488 series engine, for example to for smaller diameter design improvements,will CA488 smaller diameter improve into ca485 . through the two institutions and the four engine CA485 systematic and comprehensive introduction to furth...