基于catia三轴五档变速器三维设计.doc

摘 要 变速器是用来改变发动机传递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工况范围内工作。变速器设有空挡和倒挡。需要时变速器还有动力输出功能。 本设计变速器为机械式手动变速器，五个前进档均装有锁环式惯性同步器，除一档和倒档外，传动齿轮均采用斜齿轮，从而使变速器寿命延长，噪声降低，使换档轻便、灵活。机械式变速器因具有结构简单，传动效率高，制造成本低和工作可靠等优点，在不同形式的汽车上得到广泛应用。 本次设计内容包括：1、变速器传动机构布置方案，2、变速器主要参数的选择，3、变速器齿轮的设计与计算 ，4、变速器轴的设计与计算，5、同步器设计，6、变速器操纵机构，7、变速器结构元件七部分。 本次设计在参数、数据已计算的前提下，综合应用CATIA零部件功能和装配功能，对变速器进行了绘制和装配的三维设计。同时利用CAD绘制平面图。 关键词：变速器；变位齿轮；锁环式同步器；操纵机构 Abstract The transmission is used for changing the engine to pass to the torque and rotational speed on the drive wheel, the purpose is to start in where it is, climbing, turn, various kinds of accelerating etc. go under the operating mode, make the automobile obtain different traction force and speed, make the engine work within the range of most favorable operating mode at the same time. It is free to block and reverse gear that the transmission is had. The gear box has motive force to output the function while needing. Originally designing and changing speed device into the machinery type manual transmission, five pieces of gear of advancing are equipped with the lock ring type inertia synchronizer , besides pouring the shelf, the gear wheel of the transmission adopts the oblique gear wheel , long-lived, the noise is low, it is light , flexible to change the shelf. Originally design and include: 1 A gear box of transmission organizations assign the scheme, 2 The choices of gear boxes of main parameters, 3 The gear of design and calculation , 4 The shaft of design and calculation. 5 Synchronizers are designed，6transmission control agencies, 7 Transmission of structure components. The design parameters, the data have been calculated under the premise of the comprehensive application of the function and assembly CATIA functional components of the transmission to the rendering of three-dimensional design and assembly. At the same time, the use of CAD floor plan drawing. Keyword: Transmission；Modified gear；Friction type synchronize