（本科）毕业设计论文—-驱动桥—-变速器—-同步器—-齿轮—-取力器.doc

(毕业设计)驱动桥_变速器_同步器_齿轮_取力器 摘 要 变速器用来改变发动机传到驱动轮上的转矩和转速，目的是在原地起步、爬坡、转弯、加速等各种行驶工况下，使汽车获得不同的牵引力和速度，同时使发动机在最有利的工况范围内工作。所以变速器的结构设计的合理性直接影响到汽车动力性和经济性。设计要求达到换挡迅速、省力、方便、有较高的工作效率、工作噪声低。因此变速器在车中得到广泛应用。Abstract To change the engine used to spread transmission of torque and wheel speed, the aim of starting in place, climb, turn and accelerate a variety of driving conditions, different vehicle traction and speed, while the engine in the most favorable range conditions.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. The design of the five forward file plus a reverse of the transmission medium-sized special vehicle. In order to make the transmission more broad range of applications, application to a different project, make a check of the power transmission device. Transmission use of the middle axis, shifting the form of using the synchronizer gear shift and sliding to make the shift easy and reliable. Manipulation of institutions with self-locking and interlocking devices. 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 , and then on the intermediate shaft and the block to check gear. During the design process, using CAXA mapping, the use of software programming MATALAB. The final assembly drawing and components drawing Fig. Through this design, so that the design of the transmission of reliable, efficient transmission. Key words:Transmission,，Synchronizer，Gear，Take out of power 第一章 前 言 1 第二章 变速器结构概述 2 第三章 变速器各主要参数的设计计算 3 3.1 变速器传动比的确定 3 3.2 中心距的初步确定 4 3.3 轴的直径的初步确定 4 3.4 齿轮模数的确定 5 3.5 齿轮压力角的选择 5 3.6 各档齿轮齿数的分配 5 3.7变位系数的选择 7 3.8 齿轮齿宽的设计