基于弹流润滑的直齿轮动态效率模型及验证

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The characteristics and law of spur gears meshing were analyzed based on the elastohydrodynamic lubrication. Then a MATLAB/Simulink model was proposed for the prediction of mechanical dynamic efficiency of spur gear pairs by investigating on the computational formulas of key factors such as friction coefficients, load distribution, film thickness and so on. A period defined from the start point of meshing to the end point of meshing along line of action was divided into four parts for an easier computation of the average sliding and rolling power losses. Meanwhile, a modifying factor was rationally introduced to account for the effect of variable lubricant viscosity. The simulation results were compared with test data and the results from other prediction models. The comparative results show that the proposed prediction model is accurate.分析基于弹流润滑状态的直齿轮啮合特性及规律，考察摩擦因子、载荷分配及油膜厚度等关键因子的计算公式，建立基于MATLAB／Simulink的机械动态效率数学模型．以1对齿轮沿啮合线从啮入到啮出为1个周期，将啮合区间划分为4部分分别进行平均滑动摩擦和滚动摩擦功耗的积分计算，同时为表征实际情况中润滑油粘度变化带来的影响引入润滑油粘度变化修正因子．仿真结果与试验数据及已有数学模型的对比分析验证了所建动态效率模型的准确性．