摘 要

在汽车行业迅猛发展的今天，变速器的发展有也经历了翻天覆地的变化。无级变速器从一开始的普通带传动到宽V带，改良到现在的金属带式无级变速器，弥补了很多之前无级变速器的缺点，又增加了很多新的优点，比如传动效率高、结构紧凑、承载提高等。金属带式无级变速器的出现极大的改变了需要功率偏大的机构传动的格局。

对驾驶者与乘客来说，无级变速器技术在乘用车上的应用极大的提高了操纵稳定性和乘坐的舒适性，同时汽车时时处在一个发动机最佳转速状态下是的汽车的燃油经济性提高，降低了消费者在油费上的支出，与此同时也降低了污染物的排放。

本次是针对雪铁龙爱丽舍车型进行了金属带式无级变速器的设计。本文参考了国内外一些针对无级变速器的原理以及设计进行编纂的书籍以及论文资料，对无级变速器的使用现状、未来的发展形式、构造以及原理进行了学习和探索，并围绕最重要的带传动进行了相关的设计说明以及参数分析，并据此进行了往后各级的传动，其中最为重要的是钢带与带轮相关参数的设计。

关键词：无级变速器 燃油经济性 带传动

Abstract

With the rapid development of automobile industry at present, great changes have taken place in the advancement of transmission. Continuously variable transmission (CVT) enjoys a shift from classical belt drive to wide V-belt drive and to current metal V-belt drive, which not only decreases many shortages of CVT but also adds advantages to CVT, including high transmission efficiency, compact structure and increasing load. The invention of metal V-belt continuously variable transmission greatly changes the pattern of transmission mechanism requiring large power.

As for drivers and passengers, the application of continuously variable transmission in passenger cars enormously improves handling stability as well as sitting comfort. In the meanwhile, this application enables engine to maintain its best revolving speed all the time, which promotes fuel economy of automobiles, decreases consumers’ payment on fuels and lowers the discharge of pollutants.

This thesis makes a design of metal V-belt continuously variable transmission suitable for the Elysee model. With the reference of books and theses at home and abroad related to the theory and design of CVT, this thesis makes a study and research on the current usage, future forms of development, structures and theories of CVT. Moreover, as for the belt drive, the most important structure of CVT, it conducts relevant design specification as well as parameter analysis and designs transmission of following levels accordingly, among which the design of relevant parameter of steel belt and belt pulley enjoys the greatest importance.

Key Words: Continuously Variable Transmission, Fuel Economy, Belt Drive

目录

Abstract II

第1章.绪论 1

1.1无级变速器简况 1

1.2机械无级变速器的类型 1

1.3金属带式无级变速器的发展与优点 1

1.3.1发展 1

1.3.2优点 2

1.4本章小结 2

第2章.金属带式无级变速器传动的基本原理 3

2.1金属带式无级变速器的组成 3

2.2金属带式无级变速器的工作原理 3

2.3本章小结 4

第3章.带传动的相关设计 6

3.1主要技术指标 6

3.2基本参数 6

3.3摩擦片的设计 8

3.4压紧装置的设计 8

3.4.1曲面压紧结构 8

3.4.2回位弹簧的设计 10

3.5本章小结 11

第4章.齿轮设计 12

4.1关于齿轮的设计计算 12

4.1.1齿轮设计参数 12

4.1.2齿轮总体设计 12

4.2齿轮的加工设计 14

4.3齿轮参数校核验证 14

4.4本章小结 19

第5章.轴及其相关零件的设计 20

5.1轴的设计理论 20

5.2轴的设计计算 20

5.2.1初选轴的数据 20

5.2.2轴的强度计算 21

5.3轴上相关零件的设计 22

5.3.1轴承 22

5.3.2花键 22

5.4本章小结 22

第6章.双行星轮行星换向机构设计 23

6.1换向机构组成及工作原理 23

6.2前进离合器与倒挡制动器 23

6.3行星换挡机构齿轮设计 24

6.4本章小结 26

第7章.结论与展望 27

参考文献 28

致谢 29

第1章.绪论

1.1无级变速器简况

汽车在机械工业时代的发展是十分惊人的，从一开始简约的蒸汽汽车到当今各种功能各种用途的汽车，也就短短的百年，当然汽车的零部件也是如此，从简约单一到复杂多功能性不断发展。其中比较有代表性之一就是变速器，从简单单一到如今各种电子控制单元的加入，变速器变得越来越智能。