Cross beam, frame and vehicle

The utility model belongs to the technical field of vehicle frames, and particularly relates to a cross beam, a vehicle frame and a vehicle, the cross beam comprises a plurality of reinforcing pieces, a first arc-shaped plate and a second arc-shaped plate, and the first arc-shaped plate and the second arc-shaped plate respectively comprise a first arc-shaped reinforcing section, a supporting section and a second arc-shaped reinforcing section which are connected in sequence. One ends of the reinforcing pieces are connected with the first arc-shaped plate, the ends, away from the arc-shaped plate, of the reinforcing pieces are connected with the second arc-shaped plate, the ends, away from the first arc-shaped plate, of every two adjacent reinforcing pieces make contact with each other, or the ends, away from the second arc-shaped plate, of every two adjacent reinforcing pieces make contact with each other. According to the cross beam, the bearing capacity of the cross beam can be improved, and the stability o