| 摘要 |
A component for use in an electromagnetic friction clutch, such as a rotor assembly, and a method of manufacturing same is disclosed. The rotor assembly includes an outer annular pulley which connected to a flat annular rotor plate for concurrent rotation. The pulley is located directly radially outwardly from the rotor plate such that radial loads imposed on the pulley are transmitted directly radially inwardly through the rotor plate to a support bearing, thereby reducing or eliminating undesirable cantilever stresses. The pulley and the rotor plate are preferably formed from a single piece of injection molded material which is not magnetically permeable, such as plastic. A plurality of relatively thin, concentric annular rings formed from a magnetically permeable material is carried on the rotor plate for rotation therewith. The rotor assembly further includes an inner tube which is generally hollow and cylindrical in shape and is preferably formed from a magnetically permeable material. The inner tube is concentric with the rotor plate and extends about the inner periphery thereof. A plurality of notches is formed in one end of the inner tube to facilitate the injection molding process. Similarly, the rotor assembly includes an outer tube which is generally hollow and cylindrical in shape and is preferably formed from a magnetically permeable material. The outer tube is concentric with the rotor plate and extends about the outer periphery thereof, just inside of the pulley. A plurality of notches is also formed in one end of the outer tube to facilitate the injection molding process.
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