Patent ID: 8887890
Filing Date: 2014-11-18
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 including a first member 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 disposed on a first side of said radially extending wall of said rotor and axially spaced from said radially extending wall of said rotor; and, a field shell disposed about said hub on a second side of said radially extending wall of said rotor opposite said armature, said field shell housing a conductor therein and said field shell and said conductor isolated from said fluid wherein energization of said conductor urges said armature in a first axial direction towards said radially extending wall of said rotor to couple said rotor to said hub for rotation therewith further comprising a spring biasing said armature in said first axial direction, said spring configured to counteract an opposing force biasing said armature in a second axial direction opposite said first axial direction.