Auxiliary equipment drive system

A drive system for driving an auxiliary equipment of an automobile engine by an engine crankshaft through a torque transfer mechanism having an interim shaft, said drive system comprising:

• first power transfer means for transferring a rotational speed of said crankshaft to said interim shaft at all time;
• second power transfer means, which is comprised by a crank pulley mounted for relative rotation on said crankshaft, an interim pulley mounted for relative rotation on said interim shaft, an input pulley related to said auxiliary equipment, and a belt operationally coupling all of said pulleys, for transferring a rotational speed of said crankshaft to said auxiliary equipment;
• first electrically operated clutch means, disposed between said crankshaft and said crank pulley, for connecting and disconnecting a transfer of power between said crankshaft and said crank pulley;
• second electrically operated clutch means, disposed between said interim shaft and said interim pulley, for connecting and disconnecting a transfer of power between said interim shaft and said interim pulley;
• and
• transfer path changing means for causing said first clutch means to disconnect said transfer of power between said crankshaft and said crank pulley and said second clutch means to connect transfer of power between said interim shaft and said interim pulley so as to create a first transfer path through which said rotational speed of said crankshaft is reduced and transferred to said auxiliary equipment via said interim shaft and said second power transfer means when said engine operates in a region of low loads and low speeds of rotation, and causing said first clutch means to connect said transfer of power between said crankshaft and said crank pulley and said second clutch means to disconnect transfer of power between said interim shaft and said interim pulley so as to create a second transfer path, which has a rotational speed transfer ratio smaller than that of said first transfer path through which said rotational speed of said crankshaft is transferred to said auxiliary equipment via said crank pulley and said second power transfer means when said engine operates in a region of high loads and high speeds of rotation.