摘 要
四驱越野汽车变速器的传动方案及传动过程是本次设计的重点之一，越野汽车变速与我们之前所做的三级减速器设计不同，我们之前所做的三级减速中，齿轮与轴是靠键连接在一起的，而本次的设计中齿轮与轴不仅有键连接，而且有空套的，减速中同步器起重要作用。
同步器的类型比较多，在诸多同步器中，适合四驱越野汽车变速器的是锁销式同步器。锁销式同步器的工作原理是难点之一，四驱越野汽车操纵系统的设计是本次设计的第三个难点，他在操纵过程中涉及到挂档自锁、挂档互锁及倒档锁，这是操作系统的重要部分。
变速器是车上的一个重要部件，变速器是汽车动力系统中重要性仅次于发动机的部件,直接涉及操控乐趣和驾乘舒适性，它对燃油消耗、尾气排放、行驶动力性和舒适性都会产生重大影响。
 
关键词：变速器；同步器；齿轮
  

ABSTRACT
    Four-wheel drive off-road car transmission scheme and the transmission process is one of the focuses of this design, off-road vehicle speed and we made three before the reducer designs, we made three before the deceleration, the gear and shaft is linked by key, and this gear and shaft design not only key to connect, and free sets, slow play an important role of synchronization.
    The type of synchronizer more, in many synchronizer for four-wheel drive off-road vehicle transmission is locking pins synchronizer. Lock pin type synchronizer works by one of the difficulties, four-wheel drive off-road vehicle control system design is the design of this third difficulty, he was involved in manipulating the process of self-locking hanging file, hanging file interlock and reverse lock, this is an important part of the operating system
    Gearbox is one of the important parts of the vehicle, transmission is the automobile power system importance only to the components of an engine, directly relates to the control pleasure and ride comfort, its fuel consumption, exhaust emissions, driving dynamics and comfort will have a significant impact.
 
Keywords: Transmission; synchronizer; gear
目  录