脉动式无级变速装置的仿真及设计

论文编号:JX1516  论文字数:26751.页数:72

脉动式无级变速装置的仿真及设计
摘  要
 无级变速器（Continuously Variable Transmission，简称CVT）是一种能够使机器的输出轴转速在两个极值范围内连续变化的传动部件。一般地，按照传动介质的不同，无级变速器可以分为机械式、液压式、电力式。其中，机械式无级变速器由于结构简单，维护方便，价格低廉，传动效率较高，实用性强，传动平稳性好，工作可靠，特别是某些机械无级变速器在很大范围内具有恒功率的机械特性（这是电器和液压无级调速装置所难达到的）等优点在国内外应用日益广泛。它主要有摩擦式、链式、带式和脉动式等几大类型。
 脉动式无级变速器具有传动可靠、变速范围大、静止或运动均可调速、结构紧凑、重量较轻等优点，广泛地应用于各类传动系统中。其工作原理主要是采用连杆(或凸轮)机构作为脉冲发生器，如采用曲柄摇杆机构，将输入轴曲柄的匀速转动转变为摇杆的往复摆动，再通过单向超越离合器将摇杆的往复摆动转换为单向脉动旋转运动输出；而无级调速的实现主要通过调速机构改变连杆机构中各杆件之间的尺寸比例关系，使摇杆的摆角和其平均摆动速度实现连续改变。
 课题的主要工作内容是：
 1.基于Matlab软件环境下脉动式无级变速器的运动学仿真；
 2.基于Pro/E软件环境下脉动式无级变速器的结构设计。
 
关键词：无级变速器  脉动式无级变速器  运动学仿真  结构设计  Matlab  Pro/E

Simulation and Design of Impulse Stepless Speed Variation
ABSTRACT
 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 all 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
 ABSTRACT……………………………………………………………………Ⅱ
 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
 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