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目 录

摘要 ································································································ Ⅰ Abstract ··························································································· II 第1章 绪论 ······················································································ 1

1.1 自动变速器的特点及分类 ···························································· 2 1.2 我国自动变速器的发展现状 ························································· 2 1.3 设计目的 ················································································· 4 1.4 三速自动变速器齿轮变速系统的设计要求······································· 5 第2章 三速自动变速器齿轮结构设计 ····················································· 6

2.1 变速器齿轮机构工作原理 ···························································· 6

2.1.1 三速自动变速器齿轮变速机构 ·············································· 6 2.1.2 各执行元件的功能 ····························································· 6 2.1.3 三速自动变速器齿轮变速机构 ·············································· 7 2.1.4 变速器工作原理图 ····························································· 8 2.1.5 各档位工作情况分析表 ······················································· 9 2.2 自动变速器齿轮变速系统设计 ······················································ 9

2.2.1 三速自动变速器设计参数 ·················································· 10 2.2.2 各档位传动比计算 ··························································· 10 2.2.3 最高车速计算 ·································································· 11 2.2.4 齿轮齿数确定 ·································································· 11

第3章 各齿轮参数的确定及校核 ························································· 16

3.1 齿轮材料的选择 ······································································ 16 3.2 行星齿轮系统各元件的计算 ······················································· 16

3.2.1 齿圈的受力及计算 ··························································· 16 3.2.2 小太阳轮受力及计算 ························································ 19 3.2.3 大太阳轮受力及计算 ························································ 21 3.2.4 行星齿轮受力及计算 ························································ 22 3.3 离合器摩擦片的选择 ································································ 22 第4章 输入轴的强度校核及轴承寿命分析 ············································· 25

4.1 输入轴直径的选择 ··································································· 25

4.1.1 轴的工艺要求及材料选择 ·················································· 25 4.1.2 轴径的初步估算 ······························································ 25 4.2 输入轴的强度校核 ··································································· 26

4.3 轴承的选择及寿命计算 ····························································· 28

4.3.1 轴承的选择及寿命计算 ····················································· 28 4.3.2 轴承寿命计算 ································································· 28

结论 ································································································ 29 致谢 ································································································ 30 参考文献 ·························································································· 31 附录1 ······························································································ 32 附录2 ······························································································ 33

摘要

变速器用来改变发动机传到驱动轮上的转矩和转速，目的是在原地起步，爬坡，转弯加速等各种行驶工况下，使汽车获得不同的牵引力和速度。变速器分自动变速器和手动变速器。

长期以来具有自动变速器的轿车，一直被视为高级和豪华的象征。装有自动变速器的轿车具有很多优点。装有自动变速器的轿车可以消除职业和非职业驾驶员操作上的差异。减少驾驶员的疲劳强度，提高安全性能。自动变速器可以降低发动机排放污染。但其售价昂贵，燃油经济型较差，结构复杂，维修保养困难，较难在普及型轿车上推广。本文将根据汽车燃油经济性，爬坡度等汽车性能选取最佳传动比，对其内部结构进行设计分析计算。其中是标准件的选取标准件。

关键字：变速器，自动变速器，行星齿轮系统