轻型货车变速器设计毕业设计

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1、 I 摘 要 本次设计的题目是轻型货车变速器设计，采用车型为长城风骏皮卡。变速器由变 速器传动机构和操纵机构组成，其基本功用是改变传动比，扩大驱动轮转矩和转速的 变化范围，以适应经常变化的行驶条件，同时使发动机在有利的工况下工作;在发动机 曲轴旋转方向不变的前提下使汽车能倒退行驶；利用空挡中断动力传递，以使发动机 能够起动 、怠速，并便于变速器换挡或进行动力输出。 采用中间轴式变速器， 该变速器具有两个突出的优点： 一是其直接档的传动效率高， 磨损及噪声也最小； 二是在齿轮中心距较小的情况下仍然可以获得较大的一档传动比。 这台变速器具有五个前进档（包括一个超速档五档）和一个倒档，并通过锁环式同

2、步 器来实现换档。本设计论述了变速器的总体结构，在设计中完成了各挡齿轮和轴的计 算和校核及 CAD 绘图等工作。 关键词：变速器，锁环式同步器，传动比，中间轴，第二轴，齿轮 II 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 ba

3、sic 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 backwar

4、ds; 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

5、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

6、 structure, completed in the design of gears and shafts of the gear and check calculations and CAD drawings and other work. Keywords：Transmission, Locking ring type synchronizer,Gear ratio, Countershaft,Second axis, Gear III 目 录 摘要.I AbstractII 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