Differential self-locking device

A differential self-locking device, comprising:

• a differential housing;
• a half-shaft output gear set;
• an upper worm and worm gear mechanism;
• a lower worm and worm gear mechanism;
• a differential planetary gear set;
• a worm gear shaft;
• brake pads;
• and
• a positioning shaft sleeve;
• wherein the half-shaft output gear set, the upper worm and worm gear mechanism, the lower worm and worm gear mechanism, the differential planetary gear set, the worm gear shaft;
• the brake pads;
• and the positioning shaft sleeve are disposed in the differential housing;
• the half-shaft output gear set comprises a left half-shaft output gear and a right half-shaft output gear;
• the left half-shaft output gear and the right half-shaft output gear are symmetrically disposed in the differential housing;
• wherein the upper worm and worm gear mechanism and the lower worm and worm gear mechanism are rotationally symmetrically disposed;
• the upper worm and worm gear mechanism and the lower worm and worm gear mechanism are connected to the left half-shaft output gear and the right half-shaft output gear;
• wherein the differential planetary gear set is disposed between the upper worm and worm gear mechanism and the lower worm and worm gear mechanism;
• the differential planetary gear set is connected to the upper worm and worm gear mechanism, the lower worm and worm gear mechanism, the left half-shaft output gear, and the right half-shaft output gear through gear meshing;
• the worm gear shaft is disposed between the left half-shaft output gear and the right half-shaft output gear.