All-time four-drive differential speed driving gear

The utility model provides an all-time four-wheel-drive differential transmission device, which is characterized in that the all-time four-wheel-drive transmission device comprises two differentials, wherein the planetary carrier of the first differential and the planetary carrier of the second differential are arranged at the common shell of both differentials which is connected with a dynamic input gear, the two semi-shaft gear shafts of the first differential are respectively connected with two diagonal wheels by transmission member; the two semi-shaft gear shafts of the second differential are respectively connected with another two diagonal wheels by transmission member, the utility model overcomes the defects that the traditional part-time and full-time four-wheel-drive vehicle has low passing capability and high oil consumption, the utility model reduces the converting section from two-wheel-drive to four-wheel-drive so as to improve the safety of operation, moreover, the structure of electronic control full-time four-wheel-drive is changed to a complete mechanical structure so as to simplify the structure of differential transmission device and improve the mechanical stability and safety.