Patent ID: 8888622

Claim:
An isolator decoupler comprising: a shaft; a pulley journalled to the shaft; a clutch carrier journalled to the shaft through a one-way clutch, the one-way clutch engaged to the shaft; a torsion spring engaged between the pulley and the clutch carrier; a thrust bushing fixed to the pulley and disposed between the clutch carrier and the shaft, the thrust bushing having a thrust bushing stop and the clutch carrier having a clutch carrier stop, the thrust bushing stop and the clutch carrier stop engagable during a no load condition such that the torsion spring will not disengage from the clutch carrier; the torsion spring loadable in an unwinding direction; the torsion spring and the pulley having a predetermined clearance between a torsion spring outside diameter surface and a pulley inside diameter surface; and whereby the torsion spring outside diameter surface and a pulley inside diameter surface come into a progressive frictional engagement by torque load dependent radial expansion of the torsion spring.