Metal working – Method of mechanical manufacture – Electrical device making
Patent
1996-08-09
1998-08-11
Hughes, S. Thomas
Metal working
Method of mechanical manufacture
Electrical device making
29418, 295276, 192 8431, H01F 4100
Patent
active
057910391
ABSTRACT:
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.
REFERENCES:
patent: 2860403 (1958-11-01), Meyer
patent: 3712439 (1973-01-01), Schacher et al.
patent: 4669295 (1987-06-01), Koitabashi
patent: 4951797 (1990-08-01), Booth et al.
patent: 5096036 (1992-03-01), Booth et al.
patent: 5123157 (1992-06-01), Cerny
Ito Hiroaki
Kishibuchi Akira
Ohguchi Junichi
Suzuki Yasuhiro
Tabuchi Yasuo
Hughes S. Thomas
Nippondenso Co. Ltd.
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