无侧隙平面一次包络端面啮合环面蜗杆副弹流润滑分析

摘要

To research the lubrication performance of the conjugating tooth-pairs in anti-backlash endface meshing of planar enveloped toroidal worm in an operating cycle,a 3D mathematical model of the reconstructed contact line is obtained by utilizing meshing theory and altering the tool generatrix angle parameter.A corresponding elastohydrodynamic lubrication (EHL) model is also built according to the feature of the two-stage meshing worm gear to analyse the lubrication characteristics and the minimum film thickness distribution of the conjugating tooth meshing point in a working cycle.The research results show that the engaging-in section's minimum film thickness along the contact line is thicker than that of the engaging-out section,and that by referring to the distribution situation of the minimum film thickness and the film thickness ratio,this transmission is dominated by the partial EHL in a working cycle.Finally,through studying the relationship between the transmission parameters and the lubrication performance,it is found that the lubrication behavior can be effectively improved by properly increasing the worm's pitch circle diameter and planar inclination angle.%为了研究无侧隙平面一次包络端面啮合环面蜗杆副共轭齿对在运行周期内的润滑性能,结合经典啮合理论,通过改变工具母面的转角参数,得到了重构接触线后端面式啮合的三维数学模型,并针对蜗杆两段式啮合的特点,构建了对应的弹流润滑模型,最后对共轭齿对啮合处在一个工作周期内的润滑特性和最小油膜厚度分布规律进行了分析.结果表明:啮入端沿接触线处的最小油膜厚度大于啮出端的最小油膜厚度;根据最小油膜厚度与膜厚比的分布情况,可知该传动在整个周期内主要以部分弹流润滑为主;适当地增大蜗杆分度圆直径和工具母面的产形倾角,能够有效地改善该新型蜗杆副的润滑特性.