轮径差对机车车轮偏磨的影响

Effect of Wheel Radius Difference on Partial Wear of Locomotive

对运行在神朔线上的SS4B和SS4改电力机车进行现场检修过程中发现机车轮对经常会出现偏磨严重现象,初步分析同一轮对左右轮的轮径差是造成其偏磨严重的重要原因。对具有轮径差的轮对进行平衡位置分析,并以SS4型机车为例,利用SIMPACK软件建立机车系统动力学模型,计算轮径差对轮对横移量、冲角、蠕滑率和蠕滑力的影响,最后分析同一轴左、右轮的磨耗功率。计算结果表明:当同一轴的车轮具有轮径差时,车轴会产生横移量和冲角以达到受力平衡,轮径差越大,横移量和冲角越大;轮径差是车轮出现偏磨的重要原因,轮径差越大,左、右轮的磨耗功率相差越大,即偏磨越严重。

Serious wheel partial wear were found in SS4B and SS4G electrical locomotive, which running on the Shenshuo railway, the initial conclusion is that the radius difference between left and fight wheel made partial wear happened. The equilibrium position of wheelset which had radius difference was analyzed, and the SS4G electrical locomotive system dynamic model was built in SIMPACK MBS software and the effect of wheel radius difference on the lateral displacement, attack angle, creepage and creep force of wheelset were calculated, at last the wear powers of left and right wheel of the same wheelset were analyzed. The results indicate that when there was radius difference between left and right wheel, wheelset will have an initial lateral displacement and attack angle in order to make the force keep equilibrium, and with the increasing of wheel radius difference, the lateral displacement and attack angle become more larger; wheel radius difference is one of the most important factors which make wheel partial wear happen, and with the increasing of wheel radius difference, more larger, wear power difference between left and right wheel occurs, which would make the serious partial wear happen.