机组重心 ,是指整个机组的重量中心。机组的重心并不是固定不变的 ,它随着主机与配套机具的不同组合 ,以及前轴与后轴载荷的分配等因素的变化而变化。由于机组的重量较大 ,机车行驶速度又较快 ,因此车辆重心发生细微的变化 ,如重心前移会出现转向不足的倾向 ,重心后移会出现转 The center of gravity of the unit means the weight center of the entire unit. The center of gravity of the unit is not fixed, it varies with the different combinations of the main engine and ancillary equipment, as well as the distribution of the load on the front axle and the rear axle. As the unit weight, locomotive speed and faster, so the vehicle center of gravity subtle changes occur, such as the center of gravity forward shift will appear less prone to shift the center of gravity will turn