Patent ID: 6041490
Filing Date: 2000-03-28
Classification: B21H,B21K,Y10T

Abstract:
A method for manufacturing an electromagnetic clutch having a pulley member including a pulley groove on which a V-belt is hung, a rotor member rotating with said pulley member integrally and performing as a part of a magnetic circuit, and an armature facing and to be attached to said rotor member, said rotor member defining a magnetic breaker space penetrating said rotor member in an axial direction of said electromagnetic clutch, said method comprising:plastic forming a disk material to form a rotor member workpiece, said rotor member workpiece having two concentric, annular walls and a radially extending wall connecting said annular walls, said walls defining a concave area;inserting a first jig into said concave area to grasp said rotor member workpiece and support the outer annular wall thereof; andforming said pulley groove in said outer annular wall of said rotor member workpiece by another plastic forming operation.