Concerning the impact of lubricant viscosity between meshing tooth on vibration in the helical gear transmission, this paper proposed a model of gear meshing based on rpyrm＇s hypothesis. Taking into account of the viscosity-pressure effect of lubricant and the particularity of helical gears, the induced pressure of contact area was transformed and the elasto-hydrodynamic lubrication model of helical gearbox system was established. By solving the model, the RMS of vibration acceleration of the output shaft with variation of lubricant viscosity at 0.02-0.048 Pa-s was obtained. A test under same conditions also got the vibration acceleration of the output shaft. Simulation and test give the same trend. The amplitude of vibration of gears increases with decreasing lubricant viscosity. The test verifies the correctness of the hydrody- namic model and the model has a reference for the de-noising design of gear transmission.%考虑啮合齿面间润滑油黏度对斜齿轮传动振动的影响，根据rpy6HH推断，建立了啮合齿面的接触模型；考虑润滑油的黏压效应及斜齿轮啮合的特殊性，对接触区诱导压力进行等效变换，推导出斜齿轮传动的弹流润滑振动模型；求解模型，得到润滑油黏度在O．02～0．048Pa·s内输出轴振动加速度的脉动均方根（RMS）值；通过试验得到在同一工况下输出轴振动加速度值，并绘制其RMS值变化曲线．试验曲线和模型仿真计算结果变化趋势吻合，均表明齿轮的振动随润滑油黏度的减小而增强，验证了模型的正确性，对齿轮传动减振降噪分析设计具有一定参考价值．
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