Patent ID: 7975821

Claim:
A decoupler assembly comprising: a hub that is adapted to be coupled to a shaft for rotation therewith; a drive member disposed concentrically about the hub, the drive member being adapted to drivingly engage an endless power transmitting member to permit rotary power to be transferred between the drive member and the endless power transmitting member; a carrier rotatably mounted on the hub; a torsion coupling facilitating transfer of rotary power between the hub and the carrier, the torsion coupling comprising a spring; a clutch spring having an output end, which is coupled to the carrier, and a plurality of helical coils, the helical coils being configured to uncoil into engagement with an inner surface of the drive member to transmit rotary power between the drive member and the spring, the helical coils also being configured to coil to disengage the inner surface to inhibit transmission of rotary power between the spring and the drive member, wherein coiling of the clutch spring, uncoiling of the clutch spring or coiling and uncoiling of the clutch spring is based on relative rotation between the carrier and the hub; and a torque limiter received between the spring of the torsion coupling and the clutch spring, the torque limiter contacting the spring and the clutch spring when a torque in excess of a predetermined torque is transmitted through the decoupler assembly.