Patent ID: 7527134

Claim:
A rotational coupling device, comprising: a rotor coupled to an input shaft for rotation therewith, said input shaft disposed about a rotational axis and said rotor having a hub defining a central bore into which said input shaft extends; an armature disposed about said axis, said armature coupled to an output member and configured for selective engagement with said rotor; and, a first support member disposed about said axis wherein at least one of said hub and said first support member defines one of a key and a keyway in a radially inner surface configured for engagement with the other of said key and said keyway in a radially outer surface of said input shaft and one of said hub and said first support member defines a first notch disposed in a first axial end face of said one of said hub and said first support member and another of said hub and said first support member defines a first axially projecting lug on a first axial end of said another of said hub and said first support member configured to be received within said first notch thereby rotatably coupling said first support member and said rotor, said first notch and said first lug located further radially from said axis than said key and said keyway.