Railway freight bogie steel spring and rubber tray combined central suspension device

The utility model provides a central hanging device for freight vehicle bogie trucks, which comprises a steel spring 3, a rubber pad 4, a swing bolster 1 and a side bearer 2, wherein the steel spring 3 of the device is connected with the rubber pad 4 in series, the rubber pad 4 is provided with a positioning lock ring of the steel spring and the swing bolster 1 and the side bearer 2 are provided with positioning navel bodies of the rubber pad. The device not only can improve the transversal flexibility of bogie trucks but also can decrease the lateral vibration acceleration of the bogie trucks so as to reduce the damage of goods.