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任务书.doc
封面.doc
打印.doc
设计图
评阅表.doc
说明书.doc
鉴定意见.doc
加压盘-A3-5.dwg
端盖-A3-4.dwg
箱体端盖-A1-6.dwg
装配A0-1.dwg
轴（一）-A3-2.dwg
轴（二）-A3-3.dwg
目 录
摘要
Abstract
1绪论…………………………………………………………………… 1
1.1研究的意义及背景………………………………………………………… 1
1.2国内外机械无级变速器的研究现状……………………………………… 1
1.3毕业设计的内容和要求…………………………………………………… 2
2总体类型的比较与选择……………………………………………… 3
2.1 钢球外锥无级变速器……………………………………………………… 3
2.2 钢球长锥式无级变速器…………………………………………………… 5
2.3 两类型的比较与选择……………………………………………………… 5
3 主要零件的计算与设计……………………………………………… 6
3.1 输入、输出轴的计算与设计……………………………………………… 6
3.2 输入、输出轴上轴承的计算与设计……………………………………… 7
3.3 输入、输出轴上端盖的计算与设计……………………………………… 8
3.4 加压盘的计算与设计……………………………………………………… 8
3.5 调速齿轮上变速曲线槽的计算与设计…………………………………… 9
3.6 钢球与主、从动锥轮的计算与设计……………………………………… 10
3.7 调速机构的计算与设计…………………………………………………… 11
3.8 无极变速器的装配………………………………………………………… 12
4 主要零件的校核……………………………………………………… 14
4.1 传动部件的受力分析与强度计算………………………………………… 14
4.2 轴承的校核………………………………………………………………… 16
4.3 轴的校核…………………………………………………………………… 17
4.4 传动钢球的转速校核……………………………………………………… 19
4.5 键的校核…………………………………………………………………… 19
参考文献…………………………………………………………………… 22
附录………………………………………………………………………… 23
钢球式无级变速器结构设计
摘要：本文简要介绍了摩擦式钢球无极变速器的基本结构、设计计算、材质及润滑等方面的知识，并以此作为本次无级变速器设计的理论基础。本设计采用的是以钢球作为中间传动元件，通过改变钢球主动侧和从动侧的工作半径来实现输出轴转速连续变化的钢球锥轮式无级变速器。由钢球、主动锥轮、从动锥轮和内环所组成。动力由输入轴输入，带动主动锥轮同速转动，经钢球利用摩擦力驱动内环和从动锥轮，再经从动锥轮，Ｖ形槽自动加压装置驱动输出轴将动力输出，调整钢球轴心的倾斜角β就可达到变速的目的。本设计为恒功率输出特性，输出转速恒低于输入转速，运用于低转速大转矩传动。本文分析了在传动过程中主、从动轮，钢球和外环的工作原理和受力关系；通过受力关系分析，并针对具体参数对输入轴、输出轴、端盖、加压盘、主动追率、从动锥轮、涡轮盘等进行了计算与设计。并对调速结构进行合理设计。本文根据传动锥轮的工作应力和材料疲劳强度 ,建立起锥面传动功率、锥轮直径与材料疲劳寿命及可靠度等因素之间的关系，合理设计锥轮的结构尺寸。
关键词：无级变速器、摩擦式、钢球锥轮式、设计
Design of ball-type CVT
Abstract: This paper briefly describes the basic structure, design calculations, materials and lubrication knowledge of friction ball CVT, and theoretically bases on this as a continuously variable transmission design. This design adopts the method of steel ball as an intermediate drive component, and changing the working radius of the active side and driven side to achieve the continuous variation of the output shaft speed cone wheel CVT ball, which composes steel ball, active cone wheel, driven wheels and the inner cone. Input shaft inputs power to drive the same speed active cone wheel rotation, and through the ball friction to drive the inner cone and wheel drive, and then through the driven wheel cone, V-shaped groove automatic compression devices of drive the output shaft will output power, and adjusting the ball axis tilt angle β can achieve the purpose of changing speed. The design is for the constant power output characteristics, and output rotating speed is lower than input rotating speed constantly, used in low speed for high torque drive. This paper analyzes the working principle and force relations of the main, driven wheel, steel ball and outer ring in the transmission process. Through force relationship analysis, we calculate and design on the input shaft, output shaft, cover, pressure plate, active recovery rate, the driven bevel wheel, turbine disc, etc on account of specific parameters, and reasonably design the speed controlling structure, the drive cone wheel stress and material fatigue strength, This essay establishes a drive power cone rate, cone wheel diameter, material fatigue life and relationship between reliability factors, and rationally design the size of cone wheel, according to work force and material fatigue life of the drive cone wheel.
Keywords: continuously variable transmission, friction, steel ball cone wheel, design
参考文献
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