自行车无级变速器的结构设计

说明书

设计题目：自行车无级变速器的结构设计

专业年级： 2011级机械设计制造及其自动化学号：

姓名：

指导教师、职称：

2015 年5 月12 日

目录

中文摘要 ................................................................. I Abstract ................................................................ II 1引言................................................................ - 3 - 1.1 机械式无级变速器的定义及其应用.................................. - 3 - 1.2 机械式无级变速器的发展概况...................................... - 4 - 1.3 机械式无级变速自行车研究现状.................................... - 5 -

1.4机械式无级变速器研究的目的和意义................................ - 7 -

2 自行车无级变速器总体方案的确立 ..................................... - 8 - 2.1 链式无级变速器的分析............................................ - 8 - 2.2 钢球外锥式无级变速器的分析...................................... - 9 -

2.3 两方案的比较与选择............................................. - 10 -

3 钢球外锥式无级变速器部分零件的设计与计算 .......................... - 10 - 3.1 调速机构的设计与计算........................................... - 10 - 3.2 钢球与主﹑从动锥轮的设计与计算................................. - 12 - 3.3 输入﹑输出轴上轴承的选择与计算................................. - 13 - 3.

4 调速齿轮上变速曲线槽的设计与计算............................... - 1

5 - 3.5 输入﹑输出轴上端盖的设计与计算................................. - 1

6 - 3.6 输入轴、输出轴的设计与校核..................................... - 1

7 - 3.7 加压盘的设计与计算............................................. - 24 -

3.9 自行车无级变速器的安装......................................... - 25 -

4 自行车变速器的调整与使用方法 ...................................... - 26 - 4.1 自行车变速器的调整............................................. - 26 -

4.2.自行车变速器的使用方法......................................... - 26 -

5 结论 .............................................................. - 28 - 参考文献 ............................................................ - 29 - 致谢 ................................................................ - 30 -

中文摘要

无级变速器的传动是指的是在某些调速装置或调速机构的控制作用下,在输入轴输入一定时，输出轴的转速能在一定传动比的范围内快速且连续变化的一种传动方式。本人在分析了链式无级变速器、带式无级变速器、钢球外锥式无级变速器、钢球分离式无级变速器等各种机械式无级变速器的变速方式和无级变速自行车的基础上，将每种变速器的原理与变速方式进行了对比，最终选用结构简单、参数符合的钢球外锥式无级变速器安装使用在自行车上，该无级变速器主要由主、从动锥轮、输入轴、输出轴、加压盘、调速机构、钢球、端盖等零部件组成，此种无级变速器的工作原理为输入轴转动并且通过加压盘装置带动8个钢球运动，同时钢球利用运动过程中的摩擦力带动输出轴转动，期间通过调速机构可以使得钢球在一定的角度范围内摆动，这样就改变了钢球与主、从动锥轮的半径比，从而改变了传动比，实现了能够在一定传动比的范围内任意的变换。最终经过设计与计算，该无级变速器能够在传动比0.75--1.22的范围内进行调速。研究表明:无级变速器用于自行车有利的解决了传统变速自行车的不足之处，大大的提高了自行车的性能,方便了消费者使用。

关键词:自动变速器；无级变速自行车；无级变速器；调速

Abstract

The CVT transmission is refers to in certain speed regulating device and the regulating mechanism of control, when entering a certain input shaft, output shaft speed can in certain transmission ratio range of rapid and continuous change of a transmission mode. I based on the analysis of the chain CVT, belt CVT, ball cone CVT, ball separation of CVT and other mechanical CVT transmission and CVT bikes, the transmission principle and party each kind of transmission type were compared, the final selection with the simple structure, parameters of ball outer cone CVT mounted on a bicycle, the CVT is mainly composed of a main driven bevel wheel, input shaft, output shaft, and the regulating mechanism, pressure plate, steel ball, cover and other parts, the working principle of CVT for input shaft rotation and by with the pressure plate device drives the 8 ball movement, at the same time, the use of friction ball movement in the process of driving the output shaft to rotate through the speed regulating mechanism can make the ball during the swing within a certain angle, thus changing the steel ball and the main driven bevel wheel radius ratio, thus changing the transmission ratio, the transmission can be compared to the range of arbitrary transform. After the final design and calculation, the CVT can speed ratio range of 0.75--1.22 in drive. Research shows that: stepless speed variator for bicycle favorable solves the shortcomings of traditional variable speed bicycle, greatly improved the performance of the bicycle, convenience to the consumers to use.

Key words:automatic transmission; CVT bike; CVT; speed control