Supercharging device for an internal combustion engine

A supercharging device for which the load can be changed by an accelerator pedal comprising:

• a continuously variable transmission being driven by the engine, said transmission including a drive pulley, a driven pulley, a belt, a flyweight, and a presser member, said drive and driven pulleys having movable flanges and fixed flanges mounted on rotatable shaft members and being rotatable therewith, said belt being wound around and coupling the drive and driven pulleys, said flyweight and said presser member being provided on at least one of the drive pulley and the driven pulley, wherein said presser member includes moving means for moving a first respective movable flange toward a corresponding first fixed flange, and said flyweight displaces a second respective movable flange toward a second respective fixed flange using a centrifugal force generated therein by the rotation of said at least one pulley on which the flyweight is provided;
• a mechanical type supercharger driven by said continuously variable transmission for supercharging the engine;
• and
• control means, responsive to a predetermined engine load condition, for sliding said first respective movable flange along the axis thereof away from said first respective fixed flange against the force of the presser member, wherein said control means comprises:
• a pressure source;
• an actuator being driven by the pressure supplied from the pressure source to slide the movable flange;
• and
• a controlling device controlling the pressure supplied to the actuator under the predetermined engine load condition.