高速动车组驱动齿轮箱运行工况下润滑流场分析

Analysis of Lubrication Flow Field in Driving Gearbox of High-speed EMUs

基于齿轮箱内不可压缩的气液两相流的流场润滑,利用VOF(Volume of Fluid Model)追踪自由液面的方法,采用PISO(Pressure-Implicit with Splitting of Operators)算法,应用动网格技术求解齿轮箱内部流场,研究分析行车速度、齿轮正反转及注油量3种因素对齿轮箱内部油液瞬时分布、齿轮箱内部压力分布和各轴承进油孔质量流量的影响。计算结果表明:行车速度增加时齿轮箱内部润滑更及时有效,且内部压力均增大,各轴承进油孔质量流量增多;注油量增加时更有利于齿轮箱内部油液扩散,各轴承进油孔质量流量不同程度增多,但对压力分布影响较小;齿轮正反转对油液分布影响较小,齿轮逆时针转动时出现最大正、负压强,行车速度增加时,齿轮负压有明显变化。

Based on the flow field lubrication of the incompressible gas-liquid two-phase flow in the gear box,the VOF（ Volume of Fluid Model） was used to track the free liquid surface,and PISO（ Pressure-Implicit with Splitting of Operators） and dynamic grid technology were used to calculate the internal flow field of the gear box. The influence of driving speed,forward and reverse rotation and oil injection on the instantaneous distribution of oil inside the gearbox,the internal pressure distribution of the gear box and the mass flow of the bearing hole were analyzed. The results show that with the increasing of the driving speed,the internal lubrication of the gearbox is more timely and effective,the internal pressure of the gearbox is increased,and the mass flow rate of lubricating oil in all the oil inlet of the bearing is increasd. It is more conducive to the oil diffusion in gearbox with the increasing of the oil injection,and the mass flow rate of lubricating oil in all the oil inlet of the bearing is also increasd,while the increasing of the oil injection has little influence on the pressure distribution. The effect of positive and negative reversal on the oil distribution is small,there exists the maximun positive and negative pressure when the gear turns counterclockwise. The gear negative pressure has obvious change with the increasing of the driving speed.