1、 毕业设计（论文） 农用运输车变速器的设计 班级 学生姓名 学号 9 指导教师 职称 工程师/讲师 导师单位 论文提交日期 摘要 关于简单三轴四档式变速器的设计，首先选择的是齿轮模数，在总挡位和一 档位速比确定后， 合理分配变速器各档位的速比， 接着计算出齿轮参数和中心距， 并对齿轮进行强度验算，确定齿轮的结构和尺寸，绘制齿轮的零件图，根据经验 公式初步计算出轴的尺寸，然后对每个档位下轴的刚度和强度进行验算，确定出 轴的机构和尺寸。最终完成变速器的零件图和装配图的绘制。 变速器的齿轮为标准齿轮，档位数和传动比与发动机参数匹配，保证了汽车 具有良好的动力性和经济性。该变速器具有操作简单、方便、传
2、动效率高，制造 容易，成本低廉，维修方便的特点，适应农用运输车的使用。 本次设计的变速器对前进挡齿轮采用锁环式惯性同步器， 对于倒档齿轮采用 滑移齿轮进行换挡， 可以使制造比较方便。 变速器齿轮的润滑采用压力强制润滑， 在齿轮径向钻 34 个孔。虽然制造有点麻烦，但润滑比较可靠，而且油液是循环 的。 关键词关键词：变速器 齿轮 传动比 Abstract On the simple three axis four gear transmission design, the first choice of gear module, in the general gear and the gear
3、ratio is determined, reasonable allocation of the transmission gear ratio, and calculate the gear parameters and the distance from the center, and on the gear strength checking, determining the gear structure and size, drawing gear parts, according to the empirical formula to calculate the size of t
4、he primary shaft, then for each gear shaft stiffness and strength checking, determine the axis of the body and size. According to the arrangement of bodies and the reference of similar models corresponding to the bearing, in accordance with the national standard to choose suitable bearing, and then
5、on the bearing life calculation, finally complete the transmission part drawing and assembly drawing. Transmission gear for standard gear, gear number and transmission ratio and engine parameter matching, ensures that the car has good dynamic performance and fuel economy. The transmission has the ad
6、vantages of simple operation, convenient, high transmission efficiency, easy manufacture, low cost, convenient repair, adapted to the use of farm transport vehicle. The design of the transmission gear of the forward gears, a lock ring synchronizer inertia, used for reverse gear sliding gear shift, can create more convenient. Transmission gear lubrication with pressure lubrication, the gear radial drill 3-4 holes. While making a little trouble, b
