捷达轿车六档手动变速器毕业设计.doc

摘 要 汽车作为人类的代步工具,在生活中起着越来越重要的作用。变速器是传动系中的主要部件。它用来改变发动机传到驱动轮上的转矩和转速。目的是在各种工作状况下,使汽车获得不同的牵引力和速度。从而使汽车拥有良好的动力性和燃油经济性。本次设计以捷达型轿车的一些整车参数和发动机参数为设计依据,进行手动档变速器的设计。设计的主要内容包括变速器传动机构布置方案的确定,变速器主要参数如挡数、传动比范围、中心距、各挡传动比、齿轮参数、各挡齿轮齿数的选择,齿轮、轴的设计校核,同步器、操纵机构及箱体的设计。在设计的过程中,本文根据轿车变速器的设计要求和车辆动力传动系统自身的特点,参考多篇文献资料,以及变速器设计图册,设计出二轴式变速器。 关键词:变速器;齿轮;轴;设计;计算机辅助设计 ABSTRACT Automobile as a means of transport of human life plays an increasingly important role. Transmission is the main power train components. It is used to change the engines torque spread and wheel speed. Aim is to work in a variety of conditions,different vehicle traction and speed,so that the car has good power and fuel economy。The transmission is designed based on engine parameters and vehicle parameters of BWM 320i 2.0L automobile in this text. The main design contents include the layout program of transmission drive-mechanism, the selection of main transmission parameters such as shifts, the range of gear ratio, center-spacing, each gear ratio, gear parameters and the numble of each gear, the design and verification of gears and shafts, the design of synchronizer, manipulation-framework and gearbox. Bases on the design requirement and the characteristic of power transmission system, consulting a great deal of literatures and transmission design drafts, a kind of three-shafted transmission is designed. Key words: Transmission;Gear;Shaft;Design;Computer Aided Design 目 录 摘要 ………………………………………………………………………………………Ⅰ Abstract……………………………………………………………………………………Ⅱ 第1章 绪论 ……………………………………………………………………………1 1.1 课题的目的和意义 ………………………………………………………………1 1.2 研究现状 ………………………………………………………………………… 1 1.3 变速器的设计思想 ……………………………………………………………… 2 1.4 研究的主要工作内容 …………………………………………………………… 3 第2章 变速器设计的总体方案 ……………………………………………………4 2.1 设计依据 …………………………………………………………………………4 2.2 变速器传动机构布置方案 ………………………………………………………5 2.3 变速器基本参数的确定 …………………………………………………………6 2.3.1 挡数的确定 ………………………………………………………………6 2.3.2 传动比的确定 …………………