Patent ID: 8881882

Claim:
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 and a chamber on one side of said radially extending wall surrounding said hub, said chamber defining a sump containing a fluid; an armature supported on said hub for rotation therewith and disposed within said chamber, 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; 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; and, a first tube having a first end submerged in said fluid and extending through a first aperture in said armature wherein rotation of said armature draws fluid through said first tube and onto said first and second clutch plates.