Patent ID: 6408832
Filing Date: 2002-06-25
Classification: F02B,F02M,Y02T

Abstract:
An outboard motor, comprising:an internal combustion engine having a plurality of cylinders, each of said plurality of cylinders each having one of a plurality of pistons slidably disposed therein for reciprocal movement; a crankshaft driven by said plurality of pistons of said engine and supported within said engine for rotation about a vertical axis; a supercharger having an inlet passage and an outlet passage, said supercharger being a screw compressor comprising a first screw rotor rotatable about a first rotor axis and a second screw rotor rotatable about a second rotor axis, said first and second rotor axes being parallel to said vertical axis, said screw compressor being connected in torque transmitting relation with said crankshaft; a propulsor connected in torque transmitting relation with said crankshaft; an air conduit connected in fluid communication with said plurality of cylinders to direct a flow of charge air from said supercharger to said plurality of cylinders, said outlet passage being connected in fluid communication with said air conduit; a heat exchanger disposed in fluid communication with said air conduit between said supercharger and said plurality of cylinders and in thermal communication with said flow of charge air to reduce the temperature of said charge air prior to said flow of charge air entering said plurality of cylinders; a bypass conduit disposed in fluid communication between said air conduit and said inlet passage of said supercharger; and a bypass valve disposed within said bypass conduit to control the flow of air from said outlet passage to said inlet passage, said bypass conduit is disposed in fluid communication between said first conduit of said heat exchanger and said inlet passage of said supercharger.