采用热弹流润滑理论数值计算的风电齿轮微点蚀承载能力分析

Calculation of micro-pitting load capacity of gears for wind power based on elastohydrodynamic lubrication contact theory

在线接触热弹流润滑的基础上,对风电主齿轮的热弹流模型进行计算,对比了热弹流润滑和ISO/TR 15144—1计算出的最小油膜厚度及微点蚀安全系数。给出不同啮合点的无量纲压力、膜厚、温度分布图。结果表明:使用热弹流润滑理论直接计算风电齿轮箱微点蚀安全系数是可行的;直接使用热弹流润滑理论计算的油膜厚度小于使用ISO/TR 15144—1计算的油膜厚度;风电主齿轮箱齿面受载分析确定修形量时可以不用考虑热弹流润滑引起的压力分布变化及接触形式变化。

The computation of a micro-pitting load capacity of gears for wind power is carried out by a model based on the numerical thermal elastohydrodynamic lubrication（TEHL）contact theory.The difference of local lubricant film thickness and safety factor against micro-pitting between TEHL and ISO/TR 15144—1are compared.The oil film pressure distributions,film shapes,temperature distributions are calculated under some varied points on the path of contact.The results show that calculation of micro-pitting load capacity of gears of wind power based on TEHL contact theory is feasible;the local lubricant film thickness calculated by TEHL contact theory is less than by ISO/TR 15144—1;and it is unnecessary to consider the pressure distributions and contact pattern change caused by TEHL when determining the modifications of main gears of wind power using loaded contact analysis.