Electromagnetic clutch with dust shield

An electromagnetic clutch comprising:

• a first rotatable member of magnetic material rotatably supported on a bearing, said bearing mounted on a mount member, said first rotatable member including an outer annular cylindrical portion, an inner annular cylindrical portion, and an axial end plate connecting said outer annular cylindrical portion and said inner annular cylindrical portion, said outer annular cylindrical portion including an annular projection extending from an outer axial end thereof, said annular projection including an annular groove formed on an inner peripheral surface thereof, said outer and inner annular cylindrical portions and said axial end plate defining an inner hollow space;
• an electromagnetic housing fixedly secured to said mount member and extending within said inner hollow space, said electromagnetic housing being formed with a generally U-shaped cross section, whereby an annular hollow space is defined therein;
• an annular magnetic coil fixedly disposed within said annular hollow space of said electromagnetic housing;
• a second rotatable member having a hub secured thereon;
• a magnetic armature plate supported on said hub, said magnetic armature plate facing said first rotatable member with a predetermined axial air gap therebetween and having limited axial movement, said magnetic armature plate being attracted to said first rotatable member when said annular magnetic coil is energized;
• shielding means for shielding said electromagnetic clutch including an annular portion, an open end, and an annular flange portion extending axially from a radial end of said annular portion;
• and
• a plurality of connecting means formed on said annular flange portion of said shielding means for connecting said shielding means to said first rotatable member, so that said plurality of connecting means fit into said annular groove of said annular projection of said first rotatable member.