（毕业设计论文）《EQ1090载货汽车变速器设计》.doc

摘 要 变速器是主要,其功能是改变传动比、改变驱动轮的扭矩和转动方向。因此变速器在车中得到广泛应用。 变速器设计Abstract. Gearbox is the key part of the automobile. It is used to change the transmission ratio, torque and running direction of the driving wheel. It can change the vehicle speed and tyre torque in a big scope, cut off the power transfer from the engine, and also provides a reverse traveling direction for the vehicle. Therefore, the reasonability of the structure design of a transmission gearbox directly affects the vehicles dynamic performance. It is usually required shifting gears rapidly and conveniently, saving force, and having a higher working efficiency and low working noises. This thesis designed a manual transmission gearbox of theEQ1090ruck. A scheme of structure with three shafts, 5+1shifts and synchronizer adopted here, Combine to pour to block wheel gear and stir fork to carry on a reasonable decoration .where the first and second shafts were arranged in line. This kind of structure reduces the gearbox dimension in the axis direction, In assurance block to count under the constant circumstance, decrease wheel gear number. therefore makes the designed transmission gearbox more compact. Using the given basic parameters, it was firstly determined the transmission ratio of each shift, the shaft center distances, the gear modulus, the gear pressing angles and widths, and so on. And then the general dimension of the gearbox, including its length, width and height. The stresses of the intermediate shaft and the gears were validated by using both the calculator and a self-made MATLAB program. Finally,some engineering drawings were carried out. The calculated results show: the determined dimensions and stresses of the designed gears and shafts satisfied the design requirements; the adopted structure is reasonable. Key words: automobile；gearbox；design；synchronizer 目 录 第1章 绪 论 1 1.1变速器的简介 1 1.2变速器的功用 1 第2章 变速器设计方案及论证 3 2.1变速器的要求 3 2.2变速器的设计方法论证 3 第3章 变速器设计方案论证 5 3.1变速器基本参数的确定 5 3.1.1轴的直径的初步确定 5 3.2齿轮参