Patent ID: 8967355
Filing Date: 2015-03-03
Classification: A01D,F16D

Abstract:
1. A rotational coupling device, comprising: a hub configured for coupling to a shaft for rotation with said shaft about an axis of rotation; a rotor supported on said hub and configured for rotation relative to said hub about said axis of rotation, said rotor defining a radially extending wall; an armature supported on said hub for rotation therewith, said armature axially spaced from said radially extending wall of said rotor; a first clutch plate disposed axially between said radially extending wall of said rotor and said armature, said first clutch plate coupled to said hub for rotation therewith, but axially movable relative to said hub; a second clutch plate disposed axially between said radially extending wall of said rotor and said armature, said second clutch plate coupled to said rotor for rotation therewith, but axially movable relative to said rotor; and, a field shell disposed about said hub on an opposite side of said radially extending wall of said rotor from said armature, said field shell housing a conductor therein; wherein said armature and said first and second clutch plates are configured for movement in a first axial direction towards said radially extending wall of said rotor upon energization of said conductor to thereby cause frictional engagement of said first and second clutch plates and coupling of said rotor to said hub for rotation therewith and are configured for movement in a second axial direction opposite said first axial direction upon subsequent deenergization of said conductor, at least one of said hub and said rotor defining a first shoulder configured to limit movement of a corresponding one of said first and second clutch plates in said second axial direction wherein said at least one of said hub and said rotor comprises said hub.