非牛顿大滑滚比工况的斜齿轮热摩擦特性分析

考虑啮合过程中接触线长度及齿面载荷的时变性，结合沿接触线方向综合曲率半径及卷吸速度的瞬态特点，建立满足航空传动润滑剂非牛顿流体及大滑滚比工况的有限长线接触斜齿轮热弹流润滑(TEHL)模型。采用多重网格法及逐列扫描法，获得适用于宽泛工况范围的斜齿轮热弹流润滑完全数值解；分析非牛顿及大滑滚比情形下的斜齿轮传动热摩擦特性。结果表明:斜齿轮端部存在明显压力及温度尖峰，且离入口愈近膜厚会略减小；非牛顿特性对温度场影响显著，且接触线过节点时温度分布呈“V”型分布；摩擦因数沿啮合线方向在节点处接近于0且向两侧逐渐增大，同时随滑滚比的增大而增大。 

Thermal friction characteristics analysis of helical gears under non-Newtonian fluid and big slide-roll ratio

Considering the time-varying contact line length and gear tooth load during a meshing cycle, and combining the transient equivalent curvature and entrainment velocity along the contact line, a thermal elastohydrodynamic lubrication (TEHL) model of finite line contact for helical gears was developed under non-Newtonian fluid and big slide-roll ratio for the aerospace transmission. By employing multilevel method and sequential sweeping method, the complete TEHL numerical solution suitable to wide working conditions was obtained. The thermal friction performances for helical gears transmission were investigated in non-Newtonian fluid and big slide-roll ratio cases. Results showed that at the end of helical gears the obvious pressure and temperature peak existed, moreover the film thickness reduced slightly approaching to the engage-in position. Non-Newtonian characteristics exerted a significant influence on temperature, furthermore the temperature distribution behaved like a V-shape around the pitch point. The friction coefficient of the pitch point along the meshing line was close to zero, which gradually increased towards the two sides and with the going up of slide-roll.