Abstract: The synchronous capacity of the synchronizer is one of the important indicators to measure the working ability of the synchronizer, and the synchronous design calculation parameters affecting the synchronous capacity mainly have friction cone ring radius, cone angle, friction coefficient, so the accuracy of the coefficient of friction will directly affect the synchronization device design calculation and verification. In this paper, the method and step of measuring uncertainty of the coefficient of friction of the single-body synchronizer test bench were established by the GUM method, and then the uncertainty of the coefficient of friction was analyzed with the 20322 cone ring as an example, and the maximum coefficient of friction uncertainty was reported μmax=(0.112±0.002), k=2, including probability p≈95%. The results are analyzed, and the results show that the uncertainty component of the cone angle is the key factor that affects the accuracy of measuring the maximum coefficient of friction.

Key words: Synchronizer; Friction coefficient; GUM; Uncertainty

摘要： 同步器的同步容量是衡量同步器工作能力的重要指标之一，而影响同步容量的同步器设计计算参数主要有 摩擦锥环半径、锥面角、摩擦系数，因而摩擦系数值的准确程度会直接影响同步器设计计算及校核。文章首先采用 GUM 方法建立了单体同步器试验台摩擦系数测量不确定度的评定方法和步骤，接着以 20322 锥环为例进行了摩擦 系数不确定度分析，并给出最大摩擦系数不确度报告为 μmax =（0.112±0.002），k=2，包含概率 p≈95%，并对其结 果进行分析。分析结果表明锥面角的不确定度分量是影响测量最大摩擦系数准确度的关键因素。

关键词: 同步器；摩擦系数；GUM；不确定度