本文探讨非平稳随机动载荷作用下的拖拉机传动系统的安全性问题。采取以时变均值为核心的平稳余差线性模型来处理起步过程中传动系统的非平稳随机载荷是合理的,并且传统的动载荷系数可以由时变均值概念加以定义。最大失效概率和一定可靠度下的最小安全系数能更好地反映传动系元件在起步过程中的安全性。据此指出,神牛——25拖拉机的半轴应予加强。 This article explores the safety of tractor drive systems under non-stationary random dynamic loads. It is reasonable to deal with the nonstationary stochastic load of the driveline during the starting process by adopting the stationary linear model with time-varying mean as the core, and the traditional dynamic load coefficient can be defined by the concept of time-varying mean. The maximum failure probability and a certain degree of reliability under the minimum safety factor can better reflect the powertrain components in the starting process of safety. According to that, Shenniu - 25 tractor axle should be strengthened.