设计简介
摘 要：随着科技的不断发展，农业对于科学技术的要求也随之提高，农业机械化已经越来越普遍，而变速器在农业机械中起着至关重要的作用。对于农田作业机，必须保证的是可以前进，后退以及左右转向，因此相应的对于其核心部件变速箱的设计就要求满足有前进挡，倒挡，空挡以及左右转向装置。本文将根据以上思路进行小型农田作业机变速箱的设计以及各重要参数的详细分析，力求通过此次设计进一步熟悉机械设计原理，机械设计基础以及汽车构造等课程，熟悉运用Auto CAD绘图软件绘制零件图和总装配图。
关键词：变速器；齿轮；轴承；牙嵌式转向离合器
Abstract：With the continuous development of science and technology, increases to the requirement of science and technology of agriculture, agricultural mechanization has been more and more common, and the transmission plays an important role in agricultural machinery. For farmland rig, must make the pledge that we can move forward, backward and turn left, so the corresponding to its core parts of gearbox design is required to meet forward gears, reverse, neutral,as well as the left and right steering device. Small farms in this article, we will according to the above ideas for rig gearbox design and detailed analysis of the important parameters, makes every effort through this design to further be familiar with mechanical design principle, mechanical design basis and courses such as automobile engine be familiar with the use of Auto CAD drawing software rendering part drawing and total assembly drawings.
Key words： transmission; gear; bearing; tooth type steering clutch
目 录
摘 要……………………………………………………………………………………1
关键词……………………………………………………………………………………1
1 前言……………………………………………………………………………………2
1.1 变速器的功用………………………………………………………………………3
1.2 变速器的基本结构…………………………………………………………………3
1.3 变速器的设计目的及设计要求……………………………………………………3
2 变速器结构方案分析…………………………………………………………………4
2.1 传动机构分析………………………………………………………………………4
2.2 齿轮形式分析………………………………………………………………………4
2.3 转向机构分析………………………………………………………………………5
2.4 安全装置分析………………………………………………………………………5
3 变速器主要参数的选择………………………………………………………………5
3.1 档数…………………………………………………………………………………6
3.2 传动比………………………………………………………………………………6
3.3 齿轮主要参数的选择………………………………………………………………6
3.3.1 齿数………………………………………………………………………………6
3.3.2 模数………………………………………………………………………………6
3.3.3 压力角和齿宽……………………………………………………………………7
3.3.4 齿高、齿顶高系数和径向间隙系数……………………………………………7
4 轴的设计及校核………………………………………………………………………7
4.1 轴的设计计算………………………………………………………………………7
4.2 第一轴和半轴的校核………………………………………………………………8
4.2.1 强度校核…………………………………………………………………………8
4.2.2 刚度校核…………………………………………………………………………10
4.3 其它轴的校核………………………………………………………………………11
5 齿轮的设计及校核……………………………………………………………………12
5.1 齿轮的设计计算……………………………………………………………………12
5.1.1 1-2 档齿轮和中央传动大齿轮…………………………………………………12
5.1.2 从动轴齿轮………………………………………………………………………12
5.1.3 倒档齿轮…………………………………………………………………………13
5.2 齿轮的校核…………………………………………………………………………13
5.2.1 齿轮接触疲劳强度校核…………………………………………………………13
5.2.2 齿根弯曲疲劳强度校核…………………………………………………………14
6 轴承的选择及寿命校核………………………………………………………………15
6.1 轴承的选择…………………………………………………………………………15
6.2 轴承的寿命校核……………………………………………………………………15
7 键的选择及强度校核…………………………………………………………………16
7.1 键的选择……………………………………………………………………………16
7.2 强度校核……………………………………………………………………………16
8 结论……………………………………………………………………………………17
参考文献…………………………………………………………………………………17
致 谢…………………………………………………………………………………18
关键词：变速器；齿轮；轴承；牙嵌式转向离合器
Abstract：With the continuous development of science and technology, increases to the requirement of science and technology of agriculture, agricultural mechanization has been more and more common, and the transmission plays an important role in agricultural machinery. For farmland rig, must make the pledge that we can move forward, backward and turn left, so the corresponding to its core parts of gearbox design is required to meet forward gears, reverse, neutral,as well as the left and right steering device. Small farms in this article, we will according to the above ideas for rig gearbox design and detailed analysis of the important parameters, makes every effort through this design to further be familiar with mechanical design principle, mechanical design basis and courses such as automobile engine be familiar with the use of Auto CAD drawing software rendering part drawing and total assembly drawings.
Key words： transmission; gear; bearing; tooth type steering clutch
目 录
摘 要……………………………………………………………………………………1
关键词……………………………………………………………………………………1
1 前言……………………………………………………………………………………2
1.1 变速器的功用………………………………………………………………………3
1.2 变速器的基本结构…………………………………………………………………3
1.3 变速器的设计目的及设计要求……………………………………………………3
2 变速器结构方案分析…………………………………………………………………4
2.1 传动机构分析………………………………………………………………………4
2.2 齿轮形式分析………………………………………………………………………4
2.3 转向机构分析………………………………………………………………………5
2.4 安全装置分析………………………………………………………………………5
3 变速器主要参数的选择………………………………………………………………5
3.1 档数…………………………………………………………………………………6
3.2 传动比………………………………………………………………………………6
3.3 齿轮主要参数的选择………………………………………………………………6
3.3.1 齿数………………………………………………………………………………6
3.3.2 模数………………………………………………………………………………6
3.3.3 压力角和齿宽……………………………………………………………………7
3.3.4 齿高、齿顶高系数和径向间隙系数……………………………………………7
4 轴的设计及校核………………………………………………………………………7
4.1 轴的设计计算………………………………………………………………………7
4.2 第一轴和半轴的校核………………………………………………………………8
4.2.1 强度校核…………………………………………………………………………8
4.2.2 刚度校核…………………………………………………………………………10
4.3 其它轴的校核………………………………………………………………………11
5 齿轮的设计及校核……………………………………………………………………12
5.1 齿轮的设计计算……………………………………………………………………12
5.1.1 1-2 档齿轮和中央传动大齿轮…………………………………………………12
5.1.2 从动轴齿轮………………………………………………………………………12
5.1.3 倒档齿轮…………………………………………………………………………13
5.2 齿轮的校核…………………………………………………………………………13
5.2.1 齿轮接触疲劳强度校核…………………………………………………………13
5.2.2 齿根弯曲疲劳强度校核…………………………………………………………14
6 轴承的选择及寿命校核………………………………………………………………15
6.1 轴承的选择…………………………………………………………………………15
6.2 轴承的寿命校核……………………………………………………………………15
7 键的选择及强度校核…………………………………………………………………16
7.1 键的选择……………………………………………………………………………16
7.2 强度校核……………………………………………………………………………16
8 结论……………………………………………………………………………………17
参考文献…………………………………………………………………………………17
致 谢…………………………………………………………………………………18
