Connection structure of engine crankshaft and belt pulley

The utility model relates to a hole axle connection technology field discloses a connection structure of engine crankshaft and belt pulley, including bent axle and belt pulley, the center of belt pulley is equipped with the connecting hole, the connecting hole is the taper hole, the bent axle is the axis of cone with the junction of connecting hole, the distolateral wall in big footpath of taper hole is equipped with first keyway, the path end of taper hole is equipped with the second keyway with the opposite side of first keyway, first keyway, the inner of second keyway is sealed, first keyway, the outer end of second keyway respectively with two terminal surfaces intercommunications of belt pulley, be equipped with first woodruff key in the first keyway, the department of correspondence with first woodruff key in the axis of cone is equipped with the semicircle keyway, be equipped with the second woodruff key in the second keyway, the department of correspondence with the second woodruff key in the axis of cone also is equipped with the semicircle keyway, be equipped with the reed on the diametral plane of second woodruff key. The utility model discloses it is big to have the transmission moment of torsion, connects stable difficult wearing and tearing, the difficult not hard up beneficial effect of belt.