本发明公开了一种下车身框架，依次分为：发舱部、电池部和门槛部，其中，所述发舱部由对称的两组方管件组成，每组方管件的截面分为上框和下框，且上框和下框中分别形成有斜支撑；发舱部分为前段、中段和后段，前段和中段的外壁上

The invention discloses a lower body frame, which is successively divided into a hair compartment part, a battery part and a threshold part, wherein the hair compartment part is composed of two symmetrical groups of square pipe parts, the cross section of each group of square pipe fittings is divided into an upper frame and a lower frame, and oblique supports are formed in the upper frame and the lower frame respectively; The engine compartment is composed of front section, middle section and rear section, which are on the outer wall of the front section and middle section