Ball ramp clutch having force amplifying configuration

A compound clutch assembly comprising, in combination,

• a shaft having an axis,
• a first axial force generating assembly disposed about said shaft and having at least one first output member disposed for translation parallel to said axis, said first axial force generating assembly includes a ball ramp operator assembly having two plates defining a plurality of ramped, ball receiving recesses, a plurality of balls, a rotor, an electromagnetic coil and an armature;
• a second axial force generating assembly having a first driven member acted upon by said first output member and defining a plurality of ramped recesses, a drive member coupled for rotation with said shaft and defining a like plurality of ramped recesses and a plurality of load transferring balls disposed in said ramped recesses,
• a second output member,
• a first friction clutch pack disposed between said drive member and said driven member and having a first plurality of clutch plates coupled for rotation with said driven member and a second, interleaved plurality of clutch plates disposed for rotation with said second output member,
• a second friction clutch pack disposed between said drive member and said second output member and having a third plurality of clutch plates coupled for rotation with said shaft and a fourth plurality of clutch plates interleaved with said third plurality of clutch plates and coupled to said second output member.

A compound clutch assembly comprising, in combination,

• a first ball ramp operator assembly having a first pair of members defining opposed ramped recesses and load transferring members disposed in said recesses, a rotor, an electromagnetic coil, an armature and an apply plate,
• a second ball ramp operator assembly having a second pair of members defining opposed ramped recesses and load transferring members disposed in said recesses, said apply plate axially engaging one of said second pair of members,
• a first clutch pack disposed between said second pair of members of said second ball ramp operator assembly, and
• a second clutch pack disposed adjacent another one of said second pair of members and adapted to transfer torque from an input member to an output member.