Differential capable of automatically restricting differential ratio and increasing torque

A differential capable of automatically restricting a differential ratio and increasing torque, comprising a case, in which a differential housing is arranged, wherein the differential housing is internally provided with a planetary gear, a planetary shaft, a left half-axle gear and a right half-axle gear, the planetary gear is arranged on the planetary shaft, the planetary gear meshes with the left half-axle gear and the right half-axle gear respectively, and the differential housing comprises a left housing and a right housing that fit with each other, and wherein:

• a ring gear is arranged at one end of the left housing that fits with the right housing in an outer circumferential direction, the left half-axle gear is arranged in the left housing, a left end of the left half-axle gear is fixedly connected with a left connecting shaft that extends outward, and the left connecting shaft is provided with a left half-axle torque increasing gear and a left half-axle connecting pipe;
• a bevel ring gear is arranged at one end of the right housing that fits with the left housing in an outer circumferential direction, the right half-axle gear is arranged in the right housing, a right end of the right half-axle gear is fixedly connected with a right connecting shaft that extends outward, and the right connecting shaft is provided with a right half-axle torque increasing gear and a right half-axle connecting pipe;
• the case is also internally provided with a synchronization shaft, which is located outside the differential housing and on the same side of the left half-axle torque increasing gear and the right half-axle torque increasing gear, and which is provided with a synchronization gear which meshes with the ring gear;
• a left torque increasing free gear and a right torque increasing free gear are respectively provided on left and right sides of the synchronization shaft, wherein the left torque increasing free gear meshes with the left half-axle torque increasing gear, and the right torque increasing free gear meshes with the right half-axle torque increasing gear;
• the synchronization shaft is also provided with a left two-way overrunning device and a right two-way overrunning device, wherein the left two-way overrunning device is arranged outside the left torque increasing free gear, and the right two-way overrunning device is arranged outside the right torque increasing free gear.