Back to results
US 4,227,600 AGranted
Electromagnetic clutches
AssigneeSankyo Electric Company Limited
InventorIsamu Shirai
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSankyo Electric Company Limited
InventorIsamu Shirai
Estimating the term…
An annular armature plate of an electromagnetic clutch is provided with circular grooves in an axial end surface corresponding to the location of concentric slits of a cooperating clutch element made of a magnetic materials to define magnetic pole pieces. The armature plate further includes corresponding press-formed circular projections on the opposite end surface thereof, in order to strengthen the magnetic attraction between the armature plate and the cooperating clutch element. The armature plate may be supported on and joined to a rotatable member by leaf springs and may be provided with pin-like projections formed on the axial end surface thereof to fix the leaf springs to the armature plate. A radial flange of the rotatable member supporting the armature plate may be provided with projections with flat end surfaces on which the leaf springs are fixed without the use of washers.
In an electromagnetic clutch comprising a first rotatable member having an axial end plate of magnetic material, said end plate being provided with a plurality of concentric slits disposed on at least one circle, thereby to define a plurality of annular or arcuate magnetic pole pieces, a second rotatable member, a cooperating annular armature plate of magnetic material joined to said second rotatable member so as to be capable of limited axial movement, said annular armature plate facing said axial end plate of said first rotatable member with an axial gap therebetween, and electromagnetic means associated with said axial end plate for attracting said armature plate, said armature plate being provided with at least one annular groove in an axial end surface thereof facing said axial end plate and corresponding to said concentric slits and with at least one annular projection on an opposite axial end surface thereof corresponding to said annular grooves.
Dependencies are inferred from the claim text.