GROOVED PULLEY AND MANUFACTURING METHOD THEREFOR

摘要

A method for manufacturing a poly-V pulley includes a process for slitting and compressing the peripheral edge portion of an essentially flat blank for forming widened and thickened flange wall. A series of relatively narrow, deep, V-snaped grooves are cold rolled. The poly-V pulley thus produced has the flange wall with poly-V grooves, from the intermediate portion of which a web extends radially inward. This structure provides good dynamic balance of rotation for the pulley and thus prolong life not only of the pulley per se but also a belt to be put around the pulley. Further, the manufacturing method allows to manufacture relatively small diameter poly-V pulley.