Constant speed drive shaft assembly of band pulley end differential lock

The utility model provides a constant speed drive shaft assembly of band pulley end differential lock, includes central fixed constant velocity cardan joint, concertina type constant velocity cardan joint, jackshaft, wheel hub, holder, star cover, steel ball, inner circle, left holder, first bearing, second bearing, dust cover, right dust cover, nut. The contact surface of bell shell and steel ball is the cambered surface, and the star cover leans on the one side of holder to be the cambered surface. The contact surface of concertina type constant velocity cardan joint and inner circle and left steel ball is the face of cylinder. Wheel hub's right -hand member is equipped with left involute spline and bulge loop, and central fixed constant speed cardan joint housing body's middle -end is equipped with right involute spline corresponding with left involute spline and the scrobicular ring corresponding with the bulge loop. A left side involute spline be in the same place with right involute spline swing joint.