带有与衬套配合的滚柱轴承轴箱部件的Py型轮对,其紧固衬套螺纹在运用过程中往往会发生损坏,而这些紧固衬套是不可能用一般方法将其压出来的,因而这些轮对通常只能中止使用而放进车轮库里,挤占了库房的场地。中亚铁路局的安集延车辆段为发掘内部潜力以实现货车的滚动轴承化, Py-type wheelsets with roller-bearing axlebox parts that mate with bushings tend to experience damage to the bushing thread during use, and it is impossible for these bushing bushings to be pressed out in the usual manner Therefore, these wheelsets can usually only be put into use in the wheelhouse, and occupy the warehouse premises. The Central Asian Railway Administration’s Andijan Depot deploys internal potential to achieve rolling bearing of trucks,