125摩托车发动机汽缸设计【3张图/19700字】【优秀机械毕业设计论文】

文档包括:
说明书一份,48页,19700字左右.

图纸共3张:
A0-装配图.dwg
A3-曲柄轴等.dwg
A3-活塞.dwg

目 录
设计任务书 ………………………………………………………………………………3
引言…………………………………………………………………………………………5
原理部分……………………………………………………………………………………6
1 发动机工作原理 ……………………………………………………………………6
1.1 发动机性能术语与参数 ………………………………………………………………6
1.2 四冲程汽油发动机的工作原理 ………………………………………………………8
1.3 二冲程发动机工作原理………………………………………………………………10
摩托车发动机结构与设计部分………………………………………………………12
1 发动机机体 …………………………………………………………………………12
1.1 汽缸直径………………………………………………………………………………13
1.2 气缸工作容积、燃烧室容积和气缸总容积…………………………………………13
1.3 压缩比…………………………………………………………………………………14
1.4 气缸工作内压力、气缸总推力………………………………………………………14
1.5 气功盖…………………………………………………………………………………15
1.6 燃烧室…………………………………………………………………………………16
2 曲柄连杆机构的受力分析与平衡………………………………………………17
2.1 曲柄连杆比……………………………………………………………………………17
2.2 曲柄连杆机构运动学…………………………………………………………………17
2.3 连杆的角位移、角速度、角加速度…………………………………………………18
3 活塞运动分析 ………………………………………………………………………19
3.1 活塞位移 ………………………………………………………………………………19
3.2 活塞速度分析 …………………………………………………………………………20
3.3 活塞的加速度 …………………………………………………………………………22
3.4 热力强度 ………………………………………………………………………………23
4 活塞组…………………………………………………………………………………24
4.1 活塞 ……………………………………………………………………………………24
4.2 气环 ……………………………………………………………………………………28
4.3 油环 ……………………………………………………………………………………31
4.4 活塞销 …………………………………………………………………………………32
5 连杆、曲轴组…………………………………………………………………………34
5.1 连杆 ……………………………………………………………………………………34
5.1.1连杆承受的载荷………………………………………………………………………34
5.1.2连杆小头的安全系数…………………………………………………………………35
5.1.3连杆大头的强度验算…………………………………………………………………36
5.2曲轴销的设计……………………………………………………………………………38
5.3 曲轴 ……………………………………………………………………………………38
5.3.1 组合式曲轴 …………………………………………………………………………39
设计小结 …………………………………………………………………………………44
附图…………………………………………………………………………………………46
参考文献 …………………………………………………………………………………49

摘 要

毕业设计是机械设计课程重要的综合性与实践性教学环节，通过毕业设计可综合运用机械设计课程和其他先修课程的知识，分析和解决机械设计问题，进一步巩固、加深和拓宽所学的知识。作为机械类工科学生，完成了此项教学环节，也就为完成本科学业及将来的毕业设计奠定了良好的基础。
传统的毕业设计题目常选用通用机械的传动装置，例如以齿轮减速器为主体的机械传动装置。其主要内容包括：传动装置的总体设计；传动零件、轴、轴承、联轴器等的设计计算和选择；装配图和零件图设计；编写设计计算说明书。现选择以摩托车发动机传动和变速部分为主的新设计课题，设计方法采用常规手段与微机辅助相结合。该新题目较经典课题更具复杂性和体现时代气息，涉及的机构及零部件增多，所覆盖的知识面更广泛，结构设计难度加大，设计时要求学生综合考虑诸多因素，自己分析和解决问题，可以帮助学生树立正确的设计思想，增强创新意识和竞争意识。

关键词：摩托车发动机；分析和解决问题；设计；

Abstract
Curriculum design is important mechanical design courses integrated with practice teaching, Through courses designed to make comprehensive use of mechanical design courses and other courses of the pre-knowledge. Analyze and solve mechanical design issues and further strengthen, deepen and broaden the knowledge learned. As a mechanical engineering students, completed the teaching aspect of it for the completion of undergraduate studies and graduated from the design of the future laid a good foundation.
The traditional curriculum design often choose topics of general machinery drives, such as gear reducer for the main mechanical gear. Its main contents include: transmission of the overall design; transmission parts, axle, bearings, couplings, such as computing and the design of choice; assembly and parts map design; design calculations prepared statement. Now choose to motorcycle engine and transmission speed of the main topics of the new design, using conventional design methods and means of combining computer-assisted. The new title is more complex than the classic issues of the times and the atmosphere, the bodies and parts increased by more extensive coverage of knowledge, difficult to design the structure, designed for students considered many factors, analyze and solve their own Problems, can help students to establish the correct design ideas, strengthen their sense of innovation and the sense of competition.

Key words: Motorcycle engine, analysis and problem-solving; design;