22型客车车钩高度的控制是客车生产中经常遇到的问题。由于影响车钩高度的因素很多,生产中很难做到正确控制。本文从概率统计理论出发,经过大量的实地调查统计,提出了各个变量的控制范围,保证了车钩高度在随机组合后满足《铁路技术管理规程》的规定。这种方法也适用于其他的几个随机变量的组合问题。 Control of the height of the 22 passenger car coupler is a problem often encountered in passenger car production. Due to the many factors that affect the height of the coupler, it is difficult to control the production correctly. In this paper, starting from the theory of probability and statistics, after a large number of field surveys and statistics, the control scope of each variable is put forward to ensure that the height of coupler meets the stipulations of “Railway Technical Management Regulations” after random combination. This method also applies to the combination of several other random variables.