铁道车辆的车轮和车轴(即轮轴)在运行中,不能因为车轮上受到的横向作用力等而发生相对位移,而应该必须起到传递驱动力与制动力的作用。基于这样的原因,在轮轴上车轴的轮座外径与车轮轮毂孔内径之间设置了一定的过盈量,从而实现过盈配合,使其具有夹紧力。因此,在将车轮压装到车 Wheels and axles (that is, axles) of railway vehicles can not move relative to each other due to lateral forces applied to the wheels during operation, but rather must transmit driving force and braking force. For such a reason, a certain amount of interference is provided between the outer diameter of the wheel seat on the axle and the inner diameter of the wheel hub hole, so as to achieve an interference fit so that it has a clamping force. So, press the wheel onto the car