Differential lock structure

A differential lock structure, comprising a differential and a lock ring, wherein the case of the differential has at least one locking through hole mounted thereon, and the differential has, located therein, an output gear having a recess corresponding to the locking through hole, and the lock ring has a locking through bolt for passing through the locking through hole and inserting into the recess, and has a lock device for forcing the lock ring to stay close to the differential, characterized in that:

• the lock device includes a motor gear, an arbor and a fork, wherein the arbor circumferentially has a worm gear and the other end has a spline gear, the fork has a worm gear hole matching to the worm gear at one end and the other end clamps the lock ring, and the motor gear has a spline gear hole matching to the spline gear, so that when the motor gear rotates, the arbor is rotated thereby, and the fork therefore is moved to press the lock ring close to the differential.