目    录

引言·····················································3

设计数据及要求··········································4

1. 电动机的选择与运动参数计算·····························5

  1.1选择电动机及计算有效功率····································5

  1.2 计算总传动比················································6

  1.3 各轴的转速··················································7

  1.4 各轴的输入功率··············································7

  1.5 各轴的输入转矩··············································7

2. 选择齿轮··············································7

  2.1 高速级齿轮的设计及各参数的计算·····························7

  2.2 验算轮齿接触疲劳承载能力····································9

  2.3 验算轮齿弯曲疲劳承载能力····································9

  2.4 低速级齿轮的设计及各参数的计算······························10

  2.5 验算轮齿接触疲劳承载能力····································11

  2.6 验算轮齿弯曲疲劳承载能力····································11

3.斜齿圆柱齿轮传动几何尺寸计算··························12

4. 输入轴的设计和计算····································13

  4.1输入轴（Ⅰ轴）的已知条件····································13

  4.2选择联轴器··················································13

  4.3轴的结构设计及轴承的选择···································13

  4.4 输入轴的结构布置···········································13

  4.5 受力分析和弯矩计算·········································14

  4.6 选用键并校核···············································15

  4.7 按弯扭合成应力校核轴的强度·································15

  4.8 校核轴承A和计算寿命·······································15

  4.9 校核轴承B和计算寿命·······································16

5.中间轴的设计和计算····································16

  5.1 中间轴（Ⅱ轴）的已知条件····································16

  5.2 轴的结构设计及轴承的选择····································16

  5.3 中间轴的结构布置············································17

  5.4 受力分析和弯矩计算··········································18

  5.5 选用键并校核················································18

  5.6 按弯扭合成应力校核轴的强度··································19

  5.7 校核轴承A和计算寿命········································19

  5.8 校核轴承B和计算寿命········································19

6.输出轴的设计和计算·····································19

  6.1 输出轴（Ⅲ轴）的已知条件····································19

  6.2选择联轴器··················································20

  6.3轴的结构设计及轴承的选择···································20

  6.4 输入轴的结构布置···········································20

  6.5 受力分析和弯矩计算·········································21

  6.6 选用键并校核···············································22

  6.7 按弯扭合成应力校核轴的强度·································22

  6.8 校核轴承A和计算寿命·······································22

  6.9 校核轴承B和计算寿命·······································23

7.润滑与密封············································23

  7.1 润滑方式的选择·············································23

  7.2 密封方式的选择·············································23

  7.3 润滑油的选择···············································23

8.设计总结···············································23

参考文献················································24

引    言

   机械设计课程设计的题目常为一般用途的机械传动装置，例如带式运输机的机械传动装置——减速器。

机械设计课程通常包括以下内容：根据设计任务书确定传动装置的总体设计方案；选择电动机；计算传动装置的运动和动力参数；传动零件及轴的设计计算；轴承、连接件、润滑密封和联轴器的选择及计算；机体结构及其附件的设计；绘制装配工作图和零件工作图；编写设计计算说明书；进行总结和答辩。

在课程设计中，如由设计任务书给定传动方案时，学生应了解和分析各传动方案的特点；如设计任务书只给定工作机的性能要求（如带式运输机的有效拉力F和输送带的线速度v等），学生应根据各种传动的特点确定最佳的传动方案。

合理的传动方案，首先要满足工作机的性能要求，适应工作条件（如工作环境、场地等），工作可靠。此外还应使传动装置的结构简单、尺寸紧凑、加工方便、成本低廉、传动效率高和使用维护方便。同时满足这些要求是比较困难的，因此要通过分析比较多种传动方案，选择出能保证重点要求的最佳传动方案。

本次设计的课题是二级展开式斜齿圆柱齿轮减速器，其传动比范围一般为8-40，最大值为60.其齿轮相对于轴承为不对称布置，要求轴有较大的刚度，而且齿轮应布置在远离转矩输入输出端，以减少载荷沿齿向分布不均匀现象。

设计数据及要求

   实践题目：带式运输机的传动装置的设计与加工工艺分析

   一  、传动装置简图

 二 、工作情况

   1 .工作条件：两班制，连续单向运转，载荷较平稳，室内工作，有灰尘，环境最高温度35℃；

   2 .使用折旧期；8年；

   3 .检修间隔期：四年一次大修，两年一次中修，半年一次小修；

   4. 动力来源：电力，三相交流电，电压380/220V；

   5. 运输带速度容许误差：±5%；

   6.制造条件及生产批量：一般机械厂制造，小批量生产。

   三、原始数据

   运输带工作拉力：4000N

   运输带工作速度：1.5m/s

   卷筒直径：250mm

   四、传动方案

   二级展开式斜齿圆柱齿轮减速器 

   五、设计内容

  1. 电动机的选择与运动参数计算；

  2. 斜齿轮传动设计计算

  3. 轴的设计

  4. 滚动轴承的选择

  5. 键和连轴器的选择与校核；

  6. 装配图、零件图的绘制

  7.编写主要零件的加工工艺（填写零件加工工艺过程卡片）

  8. 设计计算说明书的编写

  六 、 设计任务

  1． 减速器总装配图一张

  2． 齿轮、轴零件图各一张

  3． 说明书一份（包括设计过程和加工工艺分析）

  七 、 设计进度

  1.第一阶段：总体计算和传动件参数计算

  2.第二阶段：轴与轴系零件的设计

  3.第三阶段：轴、轴承、联轴器、键的校核及草图绘制

  4.第四阶段：装配图、零件图的绘制、主要零件加工工艺分析及说明书的编写

…………

…………