车辆毕业设计-福克斯2.0轿车变速器的设计（全套CAD图纸）.pdf

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。变速器设有空挡,可在起动发动机、汽车滑行或
停车时使发动机的动力停止向驱动轮传输。变速器设有倒挡,使汽车获得倒退行
驶能力。需要时,变速器还有动力输出功能。
本次设计任务是设计一款用于中型轿车的前置后驱式机械式五挡变速器。手
动变速器具有结构简单、效率高、功率大、制造成本低等显著优点,所以在中国
乘用车市场一直占据着汽车变速器的主导地位。本次设计拟采用中间轴式变速器,
其显著优点是直接挡利用率较高,在其他前进挡位工作时一挡仍然有较大的传动
比。但在其他前进挡位工作时其传动效率略有降低,同时由于其操作复杂,会使
驾驶员产生疲劳感,噪声较大,这是它的缺点。
首先要选择发动机型号,确定发动机的最大功率、最大扭矩、最高转速等重
要参数,然后根据上述参数选择最大及最小传动比,合理分配各挡传动比。结合
运用汽车设计、汽车理论、机械设计、机械原理等知识,计算出变速器各个齿轮
及轴的参数并校核其强度,论证设计方案的合理性,最后要画出变速器齿轮和轴
的零件图。
关键词:变速器;传动比;齿轮;轴;计算;校核
ABSTRACT
The transmission gearbox is used to change torque and the rotate speed from
engine to driving gear, In-situ start, the hill climbing, the curve, the acceleration and
so on under each kind of travel operating mode, the goal is to obtain the different force
of traction and the speed, meanwhile makes the engine to work in the most
advantageous operating mode transmission gearbox is equipped with the
neutral which can stop the power from the engine to the driving gear transmission
when starting engine, the automobile glide or parking,The transmission gearbox is
equipped with the reverse gear, makes the automobile to obtain reversing travel
needed, the transmission gearbox also has the dynamic output function.
The task is to design one five-gear manual transmission used in the front engine
rear drive manual transmission gearbox has many advantages
including simple structure, high efficiency, big power, low production cost, therefore
which is always occupying the automobile transmission gearbox dominant position in
vehicle market of design plans to use the middle shaft-type transmission
gearbox which has the merit of high efficiency in the positive gear,and when working
in the other forward gears position still has the great velocity ratio,but reduces the
transmission efficiency, because of plicated operation, it can make the pilot to
have the w