机械毕业设计839机械菱锥式无级变速器结构设计

目录

第一章绪论 (5)

§1.1机械无级变速器的发展概况 (5)

§1.2机械无级变速器的特点 (5)

§1.3机械无级变速器的研究现状 (9)

§1.4课题的研究内容和要求 (11)

第二章菱锥式无级变速器工作原理 (14)

§2.1 无级变速器的工作原理 (14)

§2.2 菱锥无级变速器的结构特点 (16)

§2.3 菱锥无级变速器的变速原理 (17)

第三章菱锥无级变速器部分零件的设计与计算 (21)

§3.1 菱锥与主动轮结构尺寸的计算 (21)

§3.2传动件有关尺寸计算 (21)

§3.3 传动件有关尺寸的校核 (22)

§3.4 加压装置有关尺寸的计算： (23)

§3.5 输入、输出轴的结构设计： (25)

§3.6 输入、输出轴上轴承的选用 (26)

第四章主要零件的校核 (27)

§4.1 输出、输入轴的校核 (27)

§4.2 轴承的校核 (29)

总结 (29)

致谢 (31)

附录：英文文献翻译............................ 错误!未定义书签。

机械菱锥式无级变速器结构设计

摘要:机械无级变速器是一种能适应工艺要求多变、工艺流程机械化和自动化发展以及改善机械工作性能的一种通用传动装置。本文简要介绍了菱锥式机械无级变速器的基本结构、设计计算的方法、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。

本设计采用的是以菱形锥轮作为中间传动元件，通过改变锥轮的工作半径来实现输出轴转速连续变化的菱锥锥轮式无级变速器。本文分析了在传动过程中变速器的主动轮、菱锥、和外环的工作原理和受力关系；详细推导了实用的菱锥锥轮式无级变速器设计的计算公式；并针对设计所选择的参数进行了具体的设计计算；绘制了所计算的菱锥锥轮式无级变速器的装配图和主要传动元件的零件图，将此变速器的结构和工艺等方面的要求表达得更为清楚。由于机械无级变速器绝大多数是依靠摩擦传递动力，故承受过载和冲击的能力差，且不能满足严格的传动比要求。

这种无级变速器有良好的结构和性能优势，具有很强的实用价值，完全可以作为批量生产的无级变速器。其主要特点是：1.变速范围较宽；2.恒功率特性好；3.可以升、降速，正、反转。4.运转平稳，抗冲击能力较强；5.输出功率较大；6.使用寿命长；7.调速简单，工作可靠；8.容易维修。

关键词：机械无级变速器摩擦式菱锥锥轮式

Ling cone CVT mechanical structure design

NAME: Tu Yu

TEACHER:Nie Songhui

Abstract:The mechanical variable speed drives is a general purpose gearing which can accommodate the variable requirements of the process planning, mechanization of the schedule drawing ,the development of automation and the improvement of the mechanical working capabilities. The article briefly introduce the basic structure, the way of design and calculation, material and lubricate of the pyramid type variable speed drives, and taking them as the theory basis of the design of mechanical variable speed drives.

This design uses the pyramid wheel as the middle transmission component, by c hanging its’ working radius to realize the continuous change of the output axis. This article analyzes the working theory and the working forces of the drive wheel, pyramid wheel and outer ring during the transmission process. It also deduces the practical calculation formula of the pyramid wheel type variable speed drives, it also goes on the material calculation aim at the selection parameter. It protracts the assemble-drawing of the pyramid wheel type variable speed drives and the accessory-drawing of the mostly drive component. So it can express more clearly of the structure and process planning of the variable speed drives. Since the vast majority of mechanical transmission rely on mechanical friction CVT to transmit power, so it is of poor quality to withstand the impact of overload, and can not fullfil the foot strict transmission ratio.

The variable speed drives has good structure and properties, and it can use as batch production. The most specialties: 1 wide range of variable speed;2 the constant output power; 3 it can rotate positively and versedly; 4 stable accuracy of speed; 5 high output power; 6 long life; 7 simply and precise control of speed;

8 easy maintain.

Key Words: mechanical variable speed drives, friction type, pyramid type