Coil mounting and terminals for an electromagnetic clutch

An electromagnetic clutch including a rotor rotatably supported by a bearing for rotation about a central axis, a torque transmission drive on the rotor, a toroidal chamber inside the rotor that is concentric with the central axis, and an armature contact surface on the rotor;

• an armature assembly including an armature hub rotatable about the central axis, an armature attached to the armature hub and supported by the armature hub adjacent to the armature contact surface on the rotor by supports that permit axial movement of the armature relative to the armature hub;
• and a field assembly with an electromagnetic coil supported inside the toroidal chamber inside the rotor that includes a flange, a ring with a toroidal chamber that has a U-shaped cross-section defined by a base that is generally perpendicular to the central axis, a radially outer tubular portion that extends axially from the base and is concentric with the central axis, a radially inner tubular portion that extends axially from the base and is concentric with the central axis and the radially outer tubular portion, a terminal passage through the base of the ring, a bobbin with a terminal post mounted in the toroidal chamber formed by the ring adjacent to the base with the terminal post extending into the terminal passage through the base, an electromagnetic coil with a portion in contact with the bobbin and having two leads that extend out of the toroidal chamber formed by the ring through the bobbin terminal post, a cap that covers a portion of the electromagnetic coil and closes the toroidal chamber formed in the ring, fasteners that fasten the bobbin, electromagnetic coil and cap in the toroidal chamber formed by the ring, a terminal housing with passages that receive the two leads from the electromagnetic coil and engages the bobbin terminal post, a first terminal mounted in the terminal housing and in engagement with one of the two leads from the electromagnetic coil, a second terminal mounted in the terminal housing and in engagement with the other lead from the electromagnetic coil, a terminal cover which telescopically receives the first and second terminals to retain the terminal in the terminal housing, and fasteners which connect the terminal cover to the ring and fix the terminal housing relative to the electromagnetic coil.