Patent ID: 7147584

Claim:
A locking gear for a differential device configured between a main flywheel a differential and one end of a spindle, one end of said spindle passing through an outside of a central through hole set for the main flywheel, said locking gear comprising: a protruded annulet, being configured at the outside of the central through hole of the main flywheel; a plurality of radial through holes, being arranged on said protruded annulet at an interval; a plurality of grooves, being formed surrounding one end of the spindle at an interval, said grooves aiming at each radial through hole on the protruded annulet respectively when the spindle rotates to a predetermined angle; a plurality of beads, being placed in each radial through hole, said beads engaging into the grooves when the radial through holes aim at the grooves of the spindle, having a locking status when beads are at the same time in the radial through holes and the grooves, and the spindle is locked; and a clutch body being a cylinder type and sleeving one end of the spindle, and being axially movable, an end of a central through hole thereof that faces the main flywheel forms from interior to exterior a small expansion section and a large expansion section in sequence, wherein, the aperture of the small expansion section right gears the outside diameter of the protruded annulet, and therefore the beads can be fixed internally when the small expansion section aims at the perimeter of the radial through holes of the protruded annulet, and the aperture of the large expansion section must be larger than that of the small expansion section and be used as a limit circle when beads are moved outward to disengage the grooves.