Multifunctional bogie joint type lower framework

The invention relates to a multifunctional bogie joint type lower framework which comprises two square frame structures. The square frame structures are formed by welding cross beams and longitudinal beams with box-shaped sections. The square frame sections form an integral structure through a connecting device. The square frame structures are symmetrically provided with traction pull rod bases, spring bases, axle box bases, vertical damping bases and differential gear box bases by taking the connecting device as the axis. A motor base is arranged at the position, coaxial with the connecting device, of the end of each square frame structure. Two transverse shock absorber bases are arranged on the two square frame structures respectively and are symmetrical about the connecting device. Compared with the prior art, the contradiction between the requirement for vehicle transverse movement stability and the requirement for improvement of bogie curve passing-through performance is avoided, a vehicle can pass through a road with the small curve radius at high speed, and meanwhile the multifunctional bogie joint type lower framework has the good and reliable dynamics performance, and ensures sufficient strength on the basis of meeting function requirements.