变速箱论文正文

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潍坊学院本科毕业设计(论文) I 编号

潍坊学院本科毕业设计任务书

课题名称: 课题类别: 专 业: 车辆工程 年 级: 07级 指导教师: 林近山 学生姓名: 张志波

2011 年 2 月 28 潍坊学院本科毕业设计(论文)

II 微型货车三轴式变速箱设计 摘 要: 变速器是汽车传动系统结构中最重要的部分之一,汽车的前进、后退,增速、减速都要靠变速器传动来实现。而且变速器在汽车的动力性和燃油经济性上也有很重要的影响。 这次毕业设计的目标是完成货车变速箱的设计。 本设计主要是先进行了变速器方案的确定,变速器主要参数的选择,其中包括齿轮的尺寸计算及校核,轴的尺寸计算和位置的确定,变速器主要零件的设计与校核,选择设计满足其承载能力的同步器。另外,针对齿轮作用力的不同,在不同的轴上选择合适的轴承。利用软件AUTOCAD完成变速器总成图、第一轴、第二轴、中间轴、各个挡齿轮及同步器的设计。 随着我国汽车行业的迅猛发展,人们对汽车的需求也越来越高。通过对载货车变速器的设计,我了解到变速器在汽车结构中具有着重要的作用,因此变速器结构的改进对汽车行业的发展与进步具有着深远的意义。

关键词:汽车;变速器;齿轮;Autocad 潍坊学院本科毕业设计(论文)

III Design for Three-axle Gearboxes of Mini-trucks Abstracts:The transmission gearbox is one of most important parts in the automobile transmission system structure,automobile's advance,the backlash,the growth rate,the deceleration must depend on the transmission gearbox transmission to realize.Moreover the transmission gearbox also has the very important influence in automobiles power and the fuel oil efficiency. This design is mainly gear's size computation and the examination,the axis size's calcul-ation and the position's determination,the choice design satisfies its bearing capacity the syn- chromesh. Moreover,in view of the gear action's difference, chooses the appropriate bearing on the different axis.Completes the transmission gearbox unit chart,the first axis,the second axis,the intermediate shaft using software AUTOCAD, to keep off the gear and the synchromesh design one by one. Along with our country automobile profession rapid development,the people are also g- etting higher and higher to automobile's demand,Through to the truck transmission gearbox's design,I understood the transmission gearbox is having the vital role in the automobile struct- ure,so the transmission gearbox structure improvement is having the profound significance to the automobile profession development and the progress.

Keyword: Automobile; Transmission gearbox; Gear; Autocad 潍坊学院本科毕业设计(论文)

1 目 录 摘 要 ......................................................................................................................................... II Abstracts ................................................................................................ 错误!未定义书签。 第1章 绪论 ............................................................................................................................ 1 第2章 变速器的概述及其方案的确定 ................................................................................ 2 2.1 变速器的功用和要求 ................................................................................................ 2 2.2 变速器结构方案的确定 ............................................................................................ 2 2.2.1 变速器传动机构的结构分析与型式选择 .................................................... 2 2.2.2 倒挡传动方案 ................................................................................................ 3 2.3 变速器主要零件结构的方案分析 ............................................................................ 4 2.3.1 齿轮型式 ........................................................................................................ 4 2.3.2 换挡结构型式 ................................................................................................ 4 2.3.3 变速器轴承 .................................................................................................... 4

第3章 变速器主要参数的选择 ............................................................................................ 5 3.1 挡数和传动比 ............................................................................................................ 5 3.1.1 挡数 ................................................................................................................ 5 3.1.2 传动比范围 .................................................................................................... 5 3.2 中心距A................................................................................................................... 5 3.3 外形尺寸 .................................................................................................................... 6 3.4 齿轮参数 .................................................................................................................... 6 3.4.1 模数的选取 .................................................................................................... 6 3.4.2 压力角α ......................................................................................................... 6 3.4.3 螺旋角β ......................................................................................................... 7 3.4.4 齿宽 ................................................................................................................ 8 3.4.5 齿顶高系数 .................................................................................................... 9