Serpentine drive with coil spring alternator connection

A serpentine belt drive system for an automotive vehicle comprising

• a drive assembly including an internal combustion engine having an output shaft with a driving pulley thereon rotatable about a driving pulley axis, a sequence of driven assemblies each having a driven pulley rotatable about an axis parallel with said driving pulley axis and a serpentine belt mounted in cooperating relation with said driving pulley and with said driven pulleys in a sequence which corresponds with the sequence of said driven assemblies when related to the direction of movement of the belt to cause said driven pulleys to rotate in response to the rotation of said driving pulley,
• said sequence of driven assemblies including an alternator assembly including a housing and an armature assembly mounted in said housing for rotation about an armature axis,
• a hub structure fixedly carried by said armature assembly outwardly of said housing for rotation therewith about the armature axis,
• means for mounting the driven alternator pulley of said alternator assembly on said hub structure for rotational movement with respect to said hub structure about the armature axis, and
• a coil spring between said alternator pulley and said hub structure for transmitting the driven rotational movements of said alternator pulley by said serpentine belt to said hub structure such that said armature assembly is rotated in the same direction as said alternator pulley while being capable of instantaneous relative resilient rotational movements in opposite directions with respect to said alternator pulley during the driven rotational movement thereof.