渐开线斜齿轮非稳态弹流润滑数值模拟研究

建立了渐开线斜齿轮啮合的弹流润滑计算模型,将斜齿圆柱齿轮啮合的齿面接触等效为有限长线接触的弹流润滑问题.考虑斜齿轮啮合的实际因素,将斜齿轮啮合过程中的等效曲率半径和齿面载荷的变化反映到弹流润滑计算模型中,应用统一Reynolds方程方法求得轮齿在1个完整啮合周期内的瞬时弹流润滑数值解.结果表明：斜齿轮啮合线上各点处的膜厚、压力均有较大不同,各接触点处的油膜厚度受综合曲率半径的影响较大;斜齿轮传动非稳态效应相对较弱;小齿轮齿根附近和节点位置处润滑状态较差;适当增大压力角可以改善齿轮的润滑.

Numerical Simulation of Transient Elastohydrodynamic Lubrication of Helical Gears

The Elastohydrodynamic lubrication (EHL) model of the involute helical gears was developed by simplifing the contact between tooth surfaces in the mesh of a pair of helical gears into a finite line-contacts lubrication problem. The time-varying contact parameters of helical gears such as the variations of radius of curvature, the tangential surface velocities and the loads in the mesh were considered in the analysis model. Based on the unified Reynolds equation approach, the transient solutions of the entire meshing process were obtained for a pair of teeth. The results show that the distributions of pressure and film thickness varied greatly at different meshing positions. The film thickness was affected significantly by the equivalent radius of curvature of the contacting tooth surfaces at every meshing point. Transient effect was relatively weak for helical gear. The lubricating conditions seemed to be poor at the positions near the root and the pitch of the pinion. It will be helpful to improve the gears lubrication by increasing the pressure angle.