Cushman Darby & Cushman IP Group of Madison & Sutro LLP
Method for manufacturing a rotor of a magnetic clutch
 A magnetic clutch includes a rotor and an armature facing to each other for establishing a coupling connection. A serpentine magnetic circuit is formed in the rotor and the armature. A method for manufacturing a rotor of a magnetic clutch of the invention comprises the step of deforming a single ring-shaped plate of a magnetic material, by a plastic deformation process such as cold forging, into a ring-shaped element comprising generally concentric inner and outer cylindrical walls, and a ring-shaped bottom wall. Prior to or after or simultaneously with this step, ring grooves are formed on the bottom wall. A nonmagnetic material is then filled in the ring grooves, and the bottom surface of the bottom wall is cut to form a friction surface. By this cutting, the nonmagnetic material is exposed at the friction surface. 
Nippondenso Co., Ltd.
F Y Y F F Y H
F16D Y10T Y10T F16D F16D Y10T H01F
additional additional additional additional inventional additional inventional
Yasuhiro Akira Masashi Yasuo Junichi Hiroaki
Suzuki Kishibuchi Tobayama Tabuchi Ohguchi Ito