里程表齿轮传动装置是工程车辆和汽车变速器的常用装置，选用的里程表不同，要求传动装置的传动比也不同。本文以一实际应用为例，阐述了在主动齿轮不变、壳体中心距不变的情况下，通过设置带有偏心距的输出齿轮安装座，并改变从动齿轮轴相对壳体的安装位置，来得到不同的中心距，通过齿轮变位，得出多种传动比的里程表齿轮传动装置的设计方法。 Odometer gear transmission is a common device for engineering vehicles and automotive transmissions, the use of different odometer, the required transmission ratio is also different. In this paper, a practical application is taken as an example to illustrate that by setting the output gear mounting seat with eccentricity under the condition that the driving gear is constant and the center distance of the housing is unchanged, the installation position of the driven gear shaft relative to the housing is changed , To get a different center distance, through gear changes, come to a variety of gear ratio odometer gear transmission design.