<正>在原先齿轮强度可靠性设计中，强度和应力均按正态分布近似处理，计算精度较低。将齿面接触疲劳强度按威布尔分布、应力按正态分布处理，将齿根弯曲疲劳强度和应力均按对数正态分布处理，再根据平均安全系数和可靠度之间的关系，推导出了齿轮强度可靠性设计和校核公式。通过改进，使齿轮强度可靠性计算精度有所提高。

In former design of gear strength reliability, both strength and stress approximatly dealt with normal distribution, its method had lower calculation precision. After being improved, the gear surface contact fatigue strength obeys Weibull distribution and stress obeys normal distribution, the gear bottom bend fatigue strength and stress obey logarithm normal distribution, according to the relation of average safe rate and reliability, then the gear strength reliability design and check equations can be deduced. The method has higher calculation precision.