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针对直升机主减速器中的高速重载螺旋锥齿轮,建立了点接触热弹流润滑分析数学模型,包括Reynolds方程、能量方程和膜厚方程等,采用数值方法求解弹流润滑状态下的齿面摩擦因数.模型中考虑了润滑油黏度和密度随压力、温度的变化,并通过轮齿承载接触分析(LTCA)获得齿面真实载荷和卷吸速度、相对滑动速度等运动学变量.基于真实齿面点建立了螺旋锥齿轮单齿模型,考虑滑动摩擦生热和不同表面上的热边界条件,通过有限元稳态热分析和瞬态热分析得到了轮齿本体温度场和接触点瞬时闪温,并与现有文献和算例齿轮台架试验结果进行对比.
Aiming at the high speed and heavy duty helical bevel gear in the helicopter main reducer, a mathematical model of point contact thermal elastohydrodynamic lubrication was established, including Reynolds equation, energy equation and film thickness equation. The numerical method was used to solve the tooth surface Friction coefficient The kinematic variables such as true tooth load, entrainment velocity and relative sliding velocity are obtained by considering the variation of viscosity and density of lubricating oil with pressure and temperature, and by the tooth-tooth contact analysis (LTCA) The spiral bevel gear single tooth model was established. Considering the frictional heat generation and the thermal boundary conditions on different surfaces, the temperature field of the gear tooth body and the instantaneous flashover temperature of the contact point were obtained by steady state finite element analysis and transient thermal analysis , And compared with the existing literature and example gear bench test results.