Continuously variable transmission (Abbr. CVT),is a transmissiongearing, which can make the rotational speed of output axle changecontinuously between max and min. generally speaking, according totransmission medium, CVT is classified as mechanical type, hydraulictype, and electric type. For many strong points, Mechanical CVT hasmore and more developed gradually domestically and abroad. Theadvantages include simple structure, easy repairing, low price, andefficient transmission, and general application, good steady andsatisfactory function. Especially some Mechanical CVT hasunchangeable power in wide range, which doesn’t reach by electricand hydraulic CVT. It is mainly composed of friction type, chain type,belt type, impulse type.
Impulse Stepless Speed Variation has been widely applied to a原文请+QQ32491.14优.文^论,文'网 ll kinds of transmission system,because it has many advantages,such as reliable transmission,broad adjustable-speed rang, timing at rest or movement, compact structure and lighter weight, and so on.Its principle chiefly uses connecting rod(or cam) as the impulse generator such as crank-link type. Crank-link type can make uniform motion of input axle change into reciprocating swing of waving-link, and then by single super-clutch, the reciprocating swing of waving-link transmits single impulse rotating motion. We accomplish continuously variable transmission, by using structure of change speed. The structure can change dimension proportion between links and accomplish continuous change of swinging angle and average swinging speed.
Project work are:
1. Matlab software environment based on pulse-type CVT kinematics simulation;
2. Based on Pro / E software environment, the structure of impulse variable speed device design.
Key words：Continuously Variable Transmission Impulse Steeples Speed Variation kinematics simulation structural design Matlab Pro/E
目 录
摘要Ⅰ
ABSTRACTⅡ
1 概述1
1.1 无级变速器1
1.1.1 无级变速器简介1
1.1.2 无级变速器的分类及应用1
1.2 脉动式无级变速器的发展概况4
1.3 课题工作的内容6
2 脉动式无级变速器工作原理7
2.1 工作原理7
2.2 结构特点7
3 基于Matlab软件环境下的脉动式无级变速器运动学仿真9
3.1 Matlab简介9毕业论文http://www.youerw.com/
3.2 数学模型的建立9
3.3 运动学仿真11
3.3.1 计算初始值11
3.3.2 运动学仿真13
4 基于Pro/E软件环境下的脉动式无级变速器结构设计16
4.1 Pro/E简介16
4.2 传动机构设计17
4.2.1 轴的设计17
4.2.2 连杆的设计18
4.2.3 其它零部件的设计21
4.3 调速机构设计22
4.3.1 轴的设计22
4.3.2 蜗轮蜗杆的设计23
4.3.3 其它零部件的设计24
4.4 输出机构设计25
4.4.1 轴的设计25
4.4.2 超越离合器的选择26
4.4.3 其它零部件的设计27
4.5 箱体的设计29
5 脉动式无级变速器的装配及动态仿真31
5.1 虚拟装配过程31
5.2 动态仿真35
6 总结及展望38
参考文献39
附录40
谢辞42
外文翻译43
1 概述
1.1无级变速器的类型及特点
1.1.1无级变速器简介
无级变速器（Continuously Variable Transmission，简称为CVT）是一种独立的传动部件，它具有输入轴和输出轴，通过固体、液体、电磁流等中间介质将输入、输出轴直接或间接地联系起来，以传递运动和动力。其主要功能是在输入转速不变的情况下，能够使输出转速在一定范围内连续变化，满足机器或生产系统在运转过程中各种不同工况的要求。无级变速传动和定传动比、有级传动相比，能够根据工作的需要在一定范围内连续变换速度，以适应输出转速和外界负荷变化的需求，因此无级变速传动在现代传动技术领域占有重要的地位。[1]2096
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