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心盘起着传递重量及转换方向的作用。车辆通过曲线时,上下心盘的相对转动,使转向架可以绕心盘自由回转,保证安全运行。
Heart plate plays the role of transfer weight and direction. Vehicles through the curve, the relative rotation of the upper and lower heart plate, so that the bogie can be freely around the heart plate rotation, to ensure safe operation.