Patent ID: 7252610
Filing Date: 2007-08-07
Classification: F02B,F16H

Abstract:
1. An automotive engine accessory drive system in which torque at a crankshaft of an automotive engine is transmitted to a rotational shaft of an engine accessory to drive the engine accessory, the drive system comprising: an input-side pulley drivingly coupled to the crankshaft; an output-side pulley unit including a first flat pulley and a second flat pulley which are of substantially the same pulley diameter and disposed on the same axis and adjacent to each other, the first flat pulley being connectable to the rotational shaft of the engine accessory to drive the rotational shaft into rotation at a given speed ratio, the second flat pulley being connectable to the rotational shaft of the engine accessory to drive the rotational shaft into rotation at a lower speed ratio than that of the first flat pulley; a flat belt entrained between the input-side pulley and the output-side pulley unit to transmit torque at the input-side pulley to the output-side pulley unit; and a belt shifter for shifting the flat belt from the first flat pulley to the second flat pulley and vice versa.