Power bogies

The utility model relates to a power bogie which comprises wheel pairs, a spiral spring assembly, axle boxes, a bogie frame, air springs, an anti-rolling torsion bar, anti-yaw dampers, a central retractor, a basic brake and a swing bolster, wherein, the bogie frame is in an H-shaped welding structure; a side beam is in a down concave shape; a transversal side beam connecting base adopts a forging and various section design; one end of the transversal side beam connecting base is in butt joint and assembly welding with beam steel tubes, and the other end is in assembly welding with the upper cover plate and the lower cover plate of the side beam into a box structure; a brake hanger is welded on the outer ends of the beam steel tubes; a transversal damper base is welded on the side beams of the bogie frame; rubber springs with low rigidity are arranged under the spiral spring assembly; the two air springs are big bellows; when the air springs are out of air, secondary suspension has lower rigidity; and the swin