混合润滑状态下渐开线直齿轮啮合效率分析

Analysis of Meshing Efficiency of Involute Spur Gears Based on Mixed Elastohydrodynamic Lubrication

针对齿轮通常在混合润滑状态下工作的实际情况,对齿轮啮合面进行受力分析,结合弹流润滑和边界润滑两种摩擦系数,建立了混合润滑状态下的动态摩擦系数数学模型.建立了以瞬时压力角为变量的齿轮滑动摩擦功耗和滚动摩擦功耗数学模型,避免了现有的沿啮合线积分的功耗模型存在原理误差的问题.最后,对提出的混合润滑状态下渐开线直齿轮啮合功耗进行仿真,并与弹流润滑仿真、实验数据进行比较分析,验证了混合润滑状态下渐开线直齿轮摩擦系数模型以及啮合效率模型的可行性.

According to the practice that involute spur gears often work under the mixed elastohydrodynamic lubrication, a theoretical model of dynamic friction coefficient under mixed elastohydrodynamic lubrication was established based on the analysis on forces from meshing surfaces, which was a combination of elastohydrodynamic lubrication and boundary lubrication friction coefficients. A math model of sliding and rolling friction power loss was established with a variable of pressure angle, which erased the principle error of the prevailing power loss integral calculation. Finally, the simulation of power loss model was employed and compared with the test value, which verified the feasibility of meshing efficiency model of involute spur gear under the mixed lubrication.