农用植保机械高地隙桥设计(含CAD零件图装配图,CATIA三维图)

农用植保机械高地隙桥设计(含CAD零件图装配图,CATIA三维图)(任务书,开题报告,文献摘要,外文翻译,论文说明书15000字,CAD图8张,CATIA三维图)
摘  要
农用植保机械高地隙桥是为了提高农用植保机械通过性以及避免伤苗而设计的具有较高最小离地间隙的车桥。正因为其不可替代的作用，高地隙桥越来越成为农用植保机械必需的一部分。
本文首先介绍了何为农用植保机械高地隙桥，然后高地隙前后桥的功能、形式和结构进行了选型。根据车桥设计手册，依次合理地选择了高地隙桥中主减速器、差速器、半轴、支腿轴和两级减速齿轮的参数，并完成校核。
选定参数之后，利用计算机辅助设计软件CATIA完成了高地隙桥传动部件和外部壳体的三维建模。因为高地隙桥“门”字结构，所以它的壳体设计成多壳体组合的形式，包括横向桥壳、肩部壳体、支腿外壳、轮边壳体和轮边齿轮盖等，用螺栓连接成整体。
将已建好的横向桥壳CATIA模型导入到有限元分析软件ANSYS Workbench中，对四种典型行驶工况下做静力分析，完成横向桥壳的模态分析，取前六阶固有频率作分析，发现固有频率都高于路面激励频率范围0~50Hz，不会因为路面激励发生共振，设计合理。最后选用正弦载荷加载，对横向桥壳做疲劳寿命分析，最低疲劳寿命为1000万次，高于设计标准要求的50万次，设计合理。

关键词：高地隙桥；农用植保机械；有限元分析；设计
 
Abstract
Agricultural Plant Protection Machinery High Ground Gap Axles ,which with high minimum ground clearance ,are designed to improve the passing ability of agricultural plant protection machinery and to avoid injury plants. Because of its irreplaceable role, high ground gap axles are increasingly becoming an integral part of agricultural plant protection machinery.
What is the agricultural plant protection machinery high ground gap axle is firstly introduced.Then the function, form and structure of the front and rear high ground gap axle were selected. According to the axle design manual, the parameters of the main reducer, differential, half shaft, leg shaft, and two-stage reducing gears in the high ground gap axle are selected in turn and the check is completed.
After selecting the parameters, the Computer Aided Design software CATIA is used to complete the three-dimensional modeling of the transmission components and the outer shell of the high ground gap axle. Because of structure, its housing is designed in the form of a multi-hub combination, including a wheel housing, a lateral axle housing,a shoulder housing , a leg housing and a wheel gear cover. Finally,they are conneted by bolts.
The CATIA model of the transversal axle housing has been imported into the finite element analysis software ANSYS Workbench . The static analysis is performed under four typical driving conditions. And the modal analysis of the transversal axle housing is completed in next time. The first six natural frequencies are taken for analysis and found to be higher than the road excitation frequency of 0-50 Hz. Therefore, no resonance would occur and the design is reasonable. Finally, the sinusoidal loading is used to analyze the fatigue life of the transverse axle housing. The minimum fatigue life is 10 million times, which is higher than the 500,000 times required by the design standards. The design is right.
Key Words: high ground gap axle; agricultural plant protection machinery; finite element analysis; design.
 
本文研究对象就是自走式植保机械，它通常需要在田地里一边行进一边喷雾或者喷粉，为了避免植保机械底盘剐蹭损伤农作物，以及在高低起伏的农用田地中保持良好通过性，自走式植保机械需要较大的最小离地间隙，所以大部分自走式植保机械都配置了高地隙桥。高地隙桥就是通过增大轮胎直径，或者添加支腿（类似人踩高跷）的方式提高最小离地间隙之后特种车辆车桥，一般要求离地间隙在900mm及以上。
已知发动机参数、变速箱参数、整车参数和动力参数，具体信息如下：

1）发动机参数：
①型号：4B5-50V32
②型式：四缸、直列、水冷、四冲程；
③燃烧形式：直喷；
④缸径x行程：95X100；
⑤总排量：2.544，压缩比 18：1；
⑥标定功率/转速：36.8Kw/2400r/min；
⑦最大扭矩及转速：156-164Nm/1680r/min；
⑧燃油耗：<248g/Kw.h;
⑨曲轴旋转方向（面向飞轮端）：逆时针；
⑩冷却方式：水冷、强制循环。
 

目录
第1章绪论    1
1.1研究目的和意义    1
1.2国内外研究现状    1
1.2.1国外研究现状    2
1.2.2国内研究现状    2
1.3本文主要内容    3
第2章农用植保机械高地隙桥设计与校核    4
2.1概述    4
2.2高地隙桥结构选型    7
2.2.1高地隙桥功能    7
2.2.2前后高地隙桥形式    7
2.2.3高地隙桥传动部分组成及分析    8
2.3高地隙桥传动部件参数计算与校核    10
2.3.1主减速器参数选择与校核    10
2.3.2差速器参数选择与校核    13
2.3.3半轴参数选择与校核    15
2.3.4支腿轴参数选择与校核    16
2.3.5半轴外端齿轮副参数选择与校核    16
2.3.6轮边齿轮副参数选择与校核    17
2.4农用植保机械高地隙桥模型构建    18
2.4.1高地隙桥传动部件CATIA模型    18
2.4.2高地隙桥桥壳CATIA模型    19
第3章高地隙桥有限元分析    21
3.1高地隙桥壳台架试验    21
3.1.1横向桥壳测试点    21
3.2建立横向桥壳有限元模型    21
3.2.1材料参数    22
3.2.2横向桥壳有限元网格模型    22
3.3横向桥壳有限元分析    23
3.3.1横向桥壳受力分析    23
3.3.2横向桥壳分析结果    27
第4章高地隙桥疲劳寿命分析    35
4.1横向桥壳疲劳寿命分析    35
4.1.1材料的S-N曲线    35
4.1.2疲劳寿命分析结果    36
第5章横向桥壳模态分析    39
第6章结论    41
参考文献    42
附录    44
附录A  高地隙桥CATIA建模截图    44
附录B  CAD图纸截图    45
附录C计算程序    50
致 谢    52