任意卷吸速度矢量点接触摩擦系数简化计算方法

Simplified calculation method for friction coefficient in point contact with arbitrary entrainment vector

针对弧齿锥齿轮和准双曲面齿轮传动的空间点接触摩擦系数求解复杂问题,考虑油膜入口区温升与中心油膜厚度以及接触区温升与摩擦系数间的耦合关系,提出任意卷吸速度矢量点接触的摩擦系数简化计算方法.基于所提方法分析在不同工况下的点接触中心油膜厚度和摩擦系数,并将油膜厚度和摩擦系数与文献实验数据进行对比.结果表明:在高速工况下,入口区温升和接触区温升显著,忽略温升影响将使油膜厚度和摩擦系数预测结果偏大;卷吸速度夹角对油膜厚度影响较大,对摩擦系数影响相对较小;在任意卷吸速度夹角工况下,点接触油膜厚度和摩擦系数预测结果与文献实验结果一致,验证摩擦系数简化计算方法的可靠性.

Owing to the complexity of friction coefficient calculations in spatial point contact,such as spiral bevel gear and hypoid gear transmissions,a simplified calculation method for friction coefficient in point contact with arbitrary entrainment vector was proposed,considering the coupling between inlet temperature rise and center film thickness as well as the interaction between friction coefficient and temperature rise in contact zone.Based on the proposed method,the oil film thickness and friction coefficient of point contact were analyzed under different working conditions,and the oil film thickness and friction coefficient were compared with the experimental data in literatures.Results show that the temperature rise at inlet area and contact area is significant at high speed,hence the prediction results of oil film thickness and friction coefficient are large if the influence of temperature rises are ignored.The entrainment angle has great influence on the oil film thickness,but little effect on the friction coefficient.Under arbitrary entrainment angles,the predicted oil film thickness and friction coefficient for point contact agree well with experimental results from literatures,verifying the reliability of the simplified calculation method for friction coefficient.