Rotational Coupling Device Having Means for Sealing the Interface Between the Armature and the Electromagnet

A rotational coupling device, comprising:

• a rotor configured for rotation about a rotational axis;
• a brake plate disposed on a first axial side of the rotor;
• an armature disposed on a second axial side of the rotor opposite the brake plate;
• an electromagnet disposed on one axial side of the armature opposite the rotor and the brake plate;
• a spacer disposed axially between the brake plate and the electromagnet and radially outwardly of the rotor and the armature;
• and,
• a seal supported on a radially inner surface of the spacer radially outward of armature
• wherein a first axial end of the seal abuts the electromagnet.

A rotational coupling device, comprising:

• a rotor configured for rotation about a rotational axis;
• a brake plate disposed on a first axial side of the rotor;
• an armature disposed on a second axial side of the rotor opposite the brake plate;
• an electromagnet disposed on a first axial side of the armature opposite the rotor and the brake plate;
• a spacer disposed axially between the brake plate and the electromagnet and radially outwardly of the rotor and the armature;
• and,
• means, supported on a radially inner surface of the spacer, for sealing an interface between the armature and the electromagnet and inhibiting particulates on a second axial side of the armature facing the rotor from travelling to the first axial side of the armature.