汽车变速器设计论文.doc

摘要 货车作为一种常用的商用车，已在现代的社会中占有举足轻重的地位。人们的衣食住行的便利，都有货车运输方面的功劳。社会经济的发展，人们生活水平的提高更需要货车的运输，货车已成为一个国家乃至整个世界不可缺少的一样运输工具，变速器用来改变发动机传到驱动轮上的转矩和转速，使发动机在最有利工况范围内工作。变速器由变速传动机构和操纵机构组成。变速器还设有空挡和倒挡。需要时变速器还有动力输出功能。 随着汽车工业的发展，变速器的设计趋势为增大变速器传递功率与重量之比，并要求变速器具有较小的尺寸和良好的性能。在给定发动机输出转矩、转速及最高车速、最大爬坡度等条件下，着重对变速器齿轮的结构参数、轴的结构尺寸等进行设计计算。该型结构紧凑工艺性能好，适配性强，传动平稳噪声低，节油且成本低。变速器是汽车传动系统结构中最重要的部分之一，汽车的前进、后退，增速、减速都要靠变速器传动来实现。而且变速器在汽车的动力性和燃油经济性上也有很重要的影响。 本文设计研究了三轴式五挡手动变速器，对变速器的工作原理做了阐述，变速器的各挡齿轮和轴做了详细的设计计算，并进行了强度校核，对一些标准件进行了选型。变速器的传动方案设计。简单讲述了变速器中各部件材料的选择。 关键字：挡数；传动比；齿数；轴 ABSTRACT Transmission to change the engine reached on the driving wheel torque and speed, is aimed at marking start, climbing, turning, accelerate various driving conditions, the car was different traction and speed Meanwhile engine in the most favorable working conditions within the scope of the work. And the trans mission in neutral gear with reverse gear. Transmission also need power output function. Gearbox because of the low-grade work at a larger role, In general, the low-grade gearbox layout are close to the axis after support, Following from low-grade to high-grade order of the layout of stalls gear. This will not only allow axis are large enough for a rigid, but also ensures easy assembly. Gear box overall structure and rigid axle and the shell structure of relations. Generally through the control shaft length control over several stalls to ensure that adequate gear box rigid. This paper describes the design of three-axis five block manual trans mission, the transmission principle of work elaborated, Transmission of the gear shaft and do a detailed design, and the intensity of a school. For some standard parts for the selection. Transmission Trans mission program design. A brief description of the trans mission of all components of the material choice. Keywords : block; Transmission ratio; Teeth; Axis 目 录 TOC \o "1-3" \h \z \u 摘要 I ABSTRACT II 1 前言 1 2 总体方案设计 2 2.1 汽车参数的选择 2 2.2 变速器设计应满足的基本要求 2 2.3 变速器传动机构