Patent ID: 8602930

Claim:
A drive belt tensioner assembly for a motor-generator unit comprising: motor-generator unit having a drive pulley that is rotatable with a drive pulley shaft, the drive pulley being configured to engage a drive belt, extending therefrom; a drive belt assembly housing fixed to the motor-generator unit and having an inner surface that faces radially inward toward the drive pulley shaft, that extends circumferentially about the drive pulley, and that defines an opening through which the drive pulley shaft unit extends; a tensioner mounting ring disposed within, and rotatable with respect to, the inner surface, the tensioner mounting ring having an inner circumference through which the drive pulley shaft extends; a first tensioner pulley mounted for rotation about a first tensioner shaft that is fixed on the tensioner mounting ring and that extends from the tensioner mounting ring parallel to the drive pulley shaft, the first tensioner pulley being configured to engage the drive belt on a first side of the motor-generator unit drive pulley; and a biasing assembly having a first end mounted to the tensioner mounting ring and a second end mounted in a fixed relationship to the motor-generator unit, the biasing assembly being configured to exert a biasing force on the tensioner mounting ring to rotate the tensioner mounting ring and the first tensioner pulley against the drive belt.