毕业设计（论文）-机械式五挡三轴式变速器设计说明书.docVIP

绪 论 1．内容提要 本文详细介绍了机械式五挡三轴式变速器的具体过程。阐述了机械式变速器的功用、要求，介绍了变速器各种结构方案，说明了变速器主要参数的确定方法，齿轮的几何计算、强度计算等计算方法。涉及到了同步器的设计，概括同步器工作原理和工作过程，设计计算和轴承寿命的计算方法。 变速器一般安装于发动机和驱动桥之间，其主要的功用是： 1．变速与变矩 通过改变变速器的传动比，可以使汽车在不同的使用条件下得到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。 2．设置倒档和空档 在不改变发动机旋转方向的情况下便汽车能倒退行驶，在滑行或停车时发动机和传动系能保持分离。 3．变速器一般还应设置动力输出窗口。 合理的设计和布置变速器使得发动机功率得到最合理的利用，而提高汽车动力性和经济性。 本设计主导思想即在于设计以提高汽车的动力性和经济性指标，具备较高的传动效率，操纵轻便，工作可靠，噪声小为目的的机械式变速器。 由于水平有限，难免有很多不足之处，欢迎大家批评指正。 Summary This text detail has been introduced the concrete course to design one medium-sized mechanical type transmission .Has expounded the function of mechanical type transmission and the requirement , and has introduced the various structure schemes of gearbox , and explaind that the major parameter of transmission decides the method surely , the geometry computational methods such as calculation and intensity calculation etc of gear wheel .Involve the computational method of the design of synchronizer , brief synchronizer work principle and work course , design calculation and bearing life span. Involving the medium-sized freight train transmission design in this design possesses the controllability ability of better motive force , economy and good owing to the machinery transmission , and just easily equips the merits such as unassuming maintenances etc , and gets the extensive application in the society of modern times The transmission generally loads between engine and drive bridge , and major act on being the speed change becomes the carpenters square , and sets up to reverse gear and the neutral position , with the power output needs of satisfied automobile under the difference operating modes .Reasonable design and fixing up that the transmission makes that the engine merit rate gets the most reasonable utilization , and automobile motive force and economy are raised. Namely the leading thought of this design depends on motive force and economy quota in order to raise the automobile of design , and having the