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Outboard motor with a screw compressor supercharger

  • US 6,405,692 B1
  • Filed: 03/26/2001
  • Issued: 06/18/2002
  • Est. Priority Date: 03/26/2001
  • Status: Expired due to Term
First Claim
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1. 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 propulsor connected in torque transmitting relation with said crankshaft;

    an air conduit connected in fluid communication with said plurality of cylinders;

    a screw compressor having an inlet passage and an outlet passage, said outlet passage being connected in fluid communication with said air conduit, said 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;

    a bypass conduit connected in fluid communication with said outlet passage of said screw compressor; and

    a bypass valve disposed within said bypass conduit to control the flow of air from said outlet passage to said air conduit.

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