This article studies the lubrication state of the arc tooth cylindrical gears during injection lubrication. The mathematical model of arc tooth cylindrical gears are established based on meshing principle. The lubrication characteristics of arc tooth cylindrical gears under different injection methods and conditions are analysed by using computational fluid dynamics (CFD) model. The variation law of oil volume fraction in the gear-meshing zone is obtained. Comparing the two oil jet methods in into mesh lubrication, when the ratio of the pitch line velocity to the injection velocity is less than 1.5 times, the best lubrication is gained through the concave surface injection method, when the ratio of the pitch line velocity to the injection velocity is more than 1.5 times, the best lubrication is gained through the convex surface injection method. It shows that the tooth shape has significant influence on lubrication when the lubricating oil is injected.

中文翻译：

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圆弧齿圆柱齿轮齿面的润滑特性

本文研究了圆弧齿圆柱齿轮在注射润滑过程中的润滑状态。基于啮合原理建立了圆弧齿圆柱齿轮的数学模型。利用计算流体动力学（CFD）模型分析了不同注射方法和条件下圆弧齿圆柱齿轮的润滑特性。得到了齿轮啮合区油液体积分数的变化规律。将两种喷油方式进行网孔润滑比较，当节线速度与喷射速度之比小于1.5倍时，凹面喷射法获得最佳润滑效果，当节线速度与喷射速度之比小于1.5倍时，凹面喷射方式获得最佳润滑注射速度大于1.5倍，通过凸面注射方式获得最佳润滑。