Main triangle band pulley

The utility model relates to a main triangle band pulley belongs to the automobile parts field. Main triangle band pulley includes belt pulley, equipartition through -hole and mounting hole, the tooth's socket of setting on the belt pulley on the belt pulley, the belt pulley end body that the belt pulley includes the belt pulley body, extend to a lateral buckling from the belt pulley body, the belt pulley base member that sets up with belt pulley body phase -match, the tooth's socket include from belt pulley end end of body to one side extend first protruding, with the first protruding first type groove of being connected, from first type groove to the opposite side buckle the second that extends protruding, from the second protruding to the opposite side buckle the third that extends protruding, from the protruding fourth that extends to a lateral buckling of third protruding, the 5th break out to what the opposite side was buckled and is extended from the fourth is protruding, fillet radius between first type groove and second are protruding is 0.2mm, the contained angle that the fourth is protruding between swelling with the 5th is 34. The utility model has the advantages of the quality is light, cheap, and intensity is high, the quality that has not only ensured the product has still been guaranteed the intensity of product not only to reduce whole car weight volume, realizes one of vehicle lightweight way, moreover can reduce cost, and whole car and competition of the same trade improve.