重型机械中，尤其冶金设备领域，万向接轴在传动系统中的应用非常广泛。但生产中常常出现万向接轴输出轴端转速波动现象，结果是破坏了设备的同步条件，引起了打滑、附加载荷和由打滑诱发的自激振动与噪声，不仅恶化了工作条件，甚至导致设备事故。本文分析了万向接轴输出轴端速度波动的原因和计算方法，并提出防止这种现象的措施。 Heavy machinery, especially in the field of metallurgical equipment, universal joints in the transmission system is widely used. However, the production of universal joint shaft output shaft end often occur fluctuations in the speed, the result is to destroy the equipment synchronization conditions, caused by slip, additional load and self-excited by slip caused by vibration and noise, not only worsened the working conditions, and even lead Equipment accident. This paper analyzes the reason why the output shaft end of the universal joint shaft fluctuates and the calculation method, and puts forward some measures to prevent this phenomenon.