Straight-through beam integral frame type heavy truck frame

The utility model discloses a straight-through beam integral frame type heavy truck frame which comprises a first longitudinal beam, a second longitudinal beam, a head cross beam and a tail beam. The first longitudinal beam and the second longitudinal beam are of groove-shaped bending piece structures which are arranged in a mirror image mode, the front ends of the groove-shaped bending piece structures extend to the foremost portion of a vehicle, and openings of the first longitudinal beam and the second longitudinal beam are opposite to each other to form a three-section type uniform-section variable-width structure. The head cross beam and the tail beam are fixedly installed at the front end and the rear end of the first longitudinal beam and the front end and the rear end of the second longitudinal beam respectively, and the heavy truck frame is an integral frame with the wide front portion and the narrow rear portion. According to the straight-through beam integral frame type heavy truck frame, the bendi