学海网

毕业设计-微型车辆变速箱设计，共72页，23771字，附任务书、开题报告，变速箱整体装配图以及八张零件图齐全。
类型：人力换挡平面三轴式变速器，操纵杆构置于变速箱体上方。除倒档外，其余各挡齿轮全部采用斜齿轮。
档位数：四个前进档，一个倒退挡
换挡方式：前进I、II、III、IV挡级有惯性式同步器，倒挡为滑动齿轮换挡

摘 要
世界环境的不断恶化以及石油的不断消耗殆尽使得变速器的开发应用变得更为重要。目前,从现在市场上不同车型所配置的变速器来看，主要分为：手动变速器（MT）、自动变速器（AT）、手动/自动变速器（AMT）、无级变速器（CVT）,它们都各有各的优缺点。随着生活水平的不断提高现在轿车已经逐渐地进入了家庭，对于普通工薪阶层的老百姓来说，经济型轿车最为合适，手动变速器以其自身的性价比配套于经济型轿车厂家，而且经济适用型轿车的销量一直在车市名列前茅。
笔者在本次设计中，使该手动变速器保持了传统变速器结构简单、使用可靠等优点，并选择了较小扭矩的发动机，通过正确选择变速器的挡位数和传动比，使之与发动机参数优化匹配，保证该汽车具有良好的动力性与经济性。然后确定齿轮的相关尺寸以及校核齿轮的强度、刚度。接着对轴进行强度、刚度校核，对轴承的寿命进行了验算。最后达到了制造容易、成本低廉、维修方便、使用寿命长等要求。
本设计符合微型车辆变速器的发展要求，具有一定的市场效应。
关键字：微型车辆；经济型；手动变速器；设计
The Design of Transmission Gear Box for Mini Vehicle
Abstract
The world environment is continuing worsening and the oil would be consumed , so the research and development of transmission gear box is more and more important. At present, the different mini vehicle models of configuring transmission gear box in the market mainly divided into four types: Manual Ttransmission (MT) ,Aautomatic Ttransmission (AT), Aautomatic and Mmanual Ttransmission (AMT) and Constant-Voltage Transformer (CVT), they have the advantages and disadvantages comparing with each other. With the continuous improvement of living standard , now cars have entered the usual family. To the ordinary common people of working-class, the economy-car is the most appropriate. With its own cost-effective performance, manual transmission gear box is matching in the economy-car factory, and the sale of the applicable economy cars is on the top of the cars market.
The author which designing this manual transmission gear box keeps the advantages of traditional transmission gear box’s structure with simpleness , trustiness, and chooses the lesser torque motor.Choosing the correct transmission gears to match the parameters optimization of engine, ensuring the automobile has good performance and efficiency. Then confirm the relative size and check intensity and stiffness of the gear. The next step is the checking of strength and stiffness to the axis, checking the life of the bearing. Finally achieve the request of making easy, low cost, convenient maintenance and have a long life span etc.
This design conforms to the requirements of the development of mini vehicle transmission gear box, have a certain effect in the market.
Keywords: Mini vehicles; Economy type; Manual transmission gear box; Design
目录
1 绪论 1
1.1 选题的意义与目的 1
1.2 国内外研究概况及相关文献综述 2
1.3 变速器的功用与要求 4
1.4 本文的创新点 4
2 变速器传动机构方案分析与型式选择 5
2.1 传动机构的结构分析与型式选择 5
2.2 器主要零件结构的方案分析 10
3 变速器主要参数的选择与零件的设计 14
3.1 变速器主要参数的选择 14
3.2 各挡传动比及其齿轮齿数的确定 20
3.3 齿轮变位系数的选择 24
3.4 计算各齿轮的几何尺寸 25
4 变速器齿轮的强度计算与材料的选择 30
4.1 齿轮的损坏原因及形式 30
4.2 齿轮的强度计算与校核 30
5 变速器轴的强度计算与校核 35
5.1 变速器轴的结构和尺寸 35
5.2 轴的校核 37
5.3 轴承校核 45
6 变速器同步器的设计 53
6.1 的功用与结构 53
6.2 同步环主要参数的确定 54
6.3 同步器上的花键校核 57
7 变速器操纵机构 59
8 总结 60
参考文献 61
致谢 62
附录A 符号说明 63
附录Ｂ图纸明细表 65