高速重载弧齿锥齿轮点接触热弹流综合分析*

针对高速重载弧齿锥齿轮节圆位置，基于热弹流润滑理论进行齿面润滑特性分析，研究不同工况锥齿轮油膜各特征（压力、膜厚、温升）二维轮廓曲线的变化情况。结果表明：高速重载的工况使得Hertz压力峰与二次压力峰出现合并的现象，并且弹流润滑中经典的中央油膜平坦现象并不显著，仅当温度降低使润滑油黏度增加时，才逐渐出现了中央油膜平坦的现象。为了在工程实践中能够有针对性地调整工况参数来改善齿轮的润滑状态，分析油膜特征参数对输入参数的敏感性，发现工况参数中对油膜最大压力的影响程度由大到小为弹性模量、黏度、转速、功率；对油膜最大温升与最小油膜厚度的影响程度由大到小为黏度、转速、弹性模量、功率。

General Analysis of Point Contact Thermal EHL of High Speed and Heavy Load Spiral Bevel Gear

Based on the thermal elastohydrodynamic lubrication(EHL) theory,the lubrication characteristics of spiral bevel gear with high speed and heavy load were analyzed.The variation of two-dimensional profile curves of various characteristics (pressure,film thickness and temperature rise) of bevel gear oil film under different working conditions was studied.The results show that the combination of Hertz pressure peak and secondary pressure peak occurs under the condition of high speed and heavy load,and the classical flat phenomenon of central oil film in EHL is not significant.Only when the temperature decreases and the viscosity of the lubricating oil increases,the flat phenomenon of central oil film gradually appears.In order to improve the lubrication performance of gears by adjusting working condition parameters in engineering practice,the sensitivity of oil film characteristic parameters to input parameters was analyzed.It is found that the influence degree of working condition parameters on the maximum pressure of oil film is in order of elastic modulus,viscosity,rotational speed and power,the influence degree of working condition parameters on the maximum temperature rise and minimum thickness of oil film is in order of viscosity,rotational speed,elastic modulus and power.