Abstract: Tensioner for an accessory drive of a motor vehicle each have a support element adapted to be fixed on an electric machine, an intermediate element carried by the support element and rotating with respect thereto about a first fixed axis, a rigid tensioner element rotating with respect to the intermediate element about a second axis parallel to the first axis, a pair of tensioner pulleys carried by the tensioner element and adapted to cooperate with respective branches of an endless drive element of the drive positioned on opposite sides with respect to the electric machine, and a spring acting between the support element and the intermediate element to push the tensioner pulleys into contact with the endless drive element.

Abstract: Accessory drives for an internal combustion engine of a vehicle are disclosed that have a first pulley mounted on the drive shaft, a second pulley mounted on the shaft of an electric machine, a belt cooperating with the first and second pulleys, an adjustable-position pulley, and a tensioner. The tensioner has a first tensioning pulley and a second tensioning pulley and at least one spring that biases the first and second tensioning pulleys into contact with respective branches of the belt. The adjustable-position pulley cooperates with the belt to vary the installation tension thereof and is one of the first and second tensioning pulleys, one of the first and second pulleys, or another pulley in the accessory drive.

Abstract: Tensioner for an accessory drive of a motor vehicle each have a support element adapted to be fixed on an electric machine, an intermediate element carried by the support element and rotating with respect thereto about a first fixed axis, a rigid tensioner element rotating with respect to the intermediate element about a second axis parallel to the first axis, a pair of tensioner pulleys carried by the tensioner element and adapted to cooperate with respective branches of an endless drive element of the drive positioned on opposite sides with respect to the electric machine, and a spring acting between the support element and the intermediate element to push the tensioner pulleys into contact with the endless drive element.