轻型货车变速器设计本科论文.doc

摘 要 本次设计的题目是其基本功用是ABSTRACT The design is the subject of a light goods vehicle transmission design, the use of models for the Great Wall Wingle pickup. Transmission and transmission by the transmission control mechanism, whose basic skills is to change the gear ratio, wheel torque and speed to expand the scope of the changes to adapt to constantly changing driving conditions, while the engine in the favorable conditions of work; the engine crankshaft without changing the direction of rotation so that cars can travel backwards; the use of neutral interrupt power transmission to the engine to start, idle, and to facilitate the transmission shift or power output.  The use of intermediate shaft transmission, the transmission has two significant advantages: First, the direct file transmission efficiency, wear and noise are minimal; second gear center distance is smaller still can get a larger one file transmission ratio. This transmission has five forward gears (including a five-speed overdrive) and a reverse, and through the lock ring synchronizer to achieve the shift. Discusses the transmission of the overall design structure, completed in the design of gears and shafts of the gear and check calculations and CAD drawings and other work.  Keywords：ransmission, Locking ring type synchronizer,Gear ratio, Countershaft,Second axis, Gear 目 录……………………………………………………...…………………..…………I Abstract………………………………………………………………………..……....II 第1章 绪论………………………………………………………………..…………1 1.1 汽车变速器概述…………………………………………………………..…..1 1.2汽车变速器设计的目的和意义………………………………………….……2 1.3 汽车变速器国内外现状和发展趋势………………………………….……...2 1.3.1 变速器国内外的现状…………………………………………….……2 1.3.2 汽车变速器的发展趋势……………………………………….……....3 1.4 手动变速器的特点和设计要求及内容……………………………….……...3 1.4.1 手动变速器的特点……………………………………………….……3 1.4.2 手动变速器的设计要求……………………………………….………4 1.4.3设计的主要内容………………………………………………….…….4 第2章 变速器传动机构布置方案确定………………………………..………6 2.1设计所依据的主要技术参数……………………………………………….…6 2.2 变速器传动机构的结构分析和形式选择………………………….………...6 2.2.1两轴式变速器的特点分析……………………………………….……