基于STAR-CCM +的高速动车组驱动齿轮箱内部流场分析

Internal flow field analysis of drive gearbox in high-speed EMU based on STAR-CCM+

为研究齿轮箱初始注油量、齿轮旋转方向等因素对齿轮箱内部润滑油瞬态分布、压力瞬态分布和各轴承进/回油孔润滑油质量流量的影响,基于齿轮箱内部不可压缩的气液两相流,采用STAR-CCM+软件的重叠网格技术对高速动车组驱动齿轮箱内部流场进行仿真。结果表明:当大齿轮正转时,受螺旋方向的影响,车轮侧各轴承进油量大于电机侧轴承进油量;当大齿轮反转时,各轴承进油量受螺旋方向的影响较小;随着初始注油量增加,各轴承进油孔的质量流量也增加;齿轮箱内部流场达到稳态时,内部压力总体上较为平均,仅啮合区存在局部高压区与负压区。研究结果对齿轮箱润滑流道结构设计具有指导意义。

To study the influence of initial oil injection and gear rotation direction and other factors on the transient distribution of oil and pressure and the mass flow of lubricating oil in the filling and return holes of each bearing in the gearbox,based on the incompressible gas-liquid two-phase flow in the gearbox,the internal flow field of the drive gearbox in high-speed EMU is simulated using the overset grid technology of STAR-CCM+software.The results show that:while the big gear rotates in the forward direction,the oil intake of the wheel side bearing is larger than that of the motor side bearing due to the helic direction of the large gear;while the big gear rotates in the reverse direction,the influence of the helic direction on the bearing oil intake is little;the mass flow rate of the bearing filling hole can be increased by increasing the initial oil injection;while the gearbox inside fluid field reaches steady state,the internal pressure is generally average,but there are high pressure areas and negative pressure areas in the local meshing area.The research results can guide the design of the lubrication channel structure of the gearbox.