汽油链锯发动机设计

论文编号:JX805  论文字数:14619.页数:33   附CAD图

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摘     要
 人类社会文明决然离不开机械技术与机械制造。人类之所以取得文明和进步，就是因为我们不断的利用工具和改进工具。在现代社会中，机械就是原始工具的延伸，不管是工作、娱乐还是科学研究，机械设备是必不可少。
 油锯作为单人操纵的手提采伐机械,在世界各国林区得到广泛应用。目前在我国国内也越来越普及。市场上，在质量方面还是国外的产品为优，但是国内企业生产的同类产品并不缺乏竞争力。
 作为最主要部件的发动机，是各个公司体现产品优势的主要方面。随着发动机向着高强化方向的发展以及环境保护法规对排放、噪声的限制越来越严格,发动机的转速、平均有效压力、最高爆发压力不断提高，对发动机的性能要求越来越高。
   本文结合了大量文献资料，以及国内目前的二冲程发动机发展趋势，以现有的产品为辅助，设计一款汽油链锯用的发动机。本次设计主要是结构方面的设计，然后在结构上考虑所受的各种作用力，分别对气缸、活塞、活塞环、活塞销、连杆进行了结构选择及布置、材料选用以及重要尺寸参数的设计计算，并对活塞连杆组的危险部位如活塞销、连杆杆身等进行了强度校核，使设计的活塞连杆总成结构合理、轻量化、可靠耐久。并采用PROE将其设计出来，这样直观的表达了这款发动机的结构。

关键词：园林机械 汽油链锯 二冲程发动机 设计 校核

 Abstract
 Human civilization can unquestionably mechanical technology and machinery manufacture. Human civilization and progress,becasuce we constantly use tools and improve tools. In the modern society, Machinery is extension of primitive tools, whether working and entertainment or scientific research, it is essential.
     As a single manipulation of portable fire-fighting cutting machine, it is widely used in the world. At present it is becoming more and more popular in our country. On the market, foreign products are better, but our products also have competitive.
     The engine is the most important part. It is reflected the main product superiority by each company. Engine’s high strength is more bingger.The law about emissions, noise limiting is more and more strictly. The speed of the engine, the average effective pressure, the maximum breakout pressure enhances unceasingly. Engine performance is higher and higher.
     Combining considerable amount of literatures with the trend of development of two stroke engine at home and abroad.With the existing products for auxiliary Considered each kind of load the assembly parts enduring, this paper design the assembly parts individually. The primary coverage includes choseing the compatible structure and the proper material for the piston,the piston ring,the piston pin and the connecting rod, calculating the important size parameter, examinating the intensity of the dangerous spot ,such as the piston pin and the rod. the main purpse is to ensure the structure of the assembly is reasonable,has a lightweight, durable and reliable.It’s designed by PROE,so we can intuitive understand this engine structure.

 Keywords: Garden machinery; Gasoline chain saws; Two stroke engine; Designcheck

目  录
摘 要 ⅰ
Abstract ⅱ
目 录 ⅲ
第一章 绪论 1
1.1汽油链锯的介绍 1
 1.2研究动机与目的 1
 1.3研究背景 1
 1.4研究方法与描述 1
 1.5论文内容概述 1
第二章 汽油链锯发动机原理及性能 3
2.1四冲程汽油发动机的工作原理 3
2.2二冲程汽油发动机的工作原理 4
2.3汽油链锯发动机类型的选择 5
第三章 发动机关键部分设计 6
3.1气缸的设计 6
3.2活塞的设计 9
3.3曲轴连杆的设计 16
3.4曲轴箱体的设计 20
第四章 强度校核 22
4.1活塞销的强度校核 22
4.2 连杆的强度校核 23
第五章  发动机三维实体设计 26
第六章  总 结 28
参考文献 29
致  谢 30