Inlet And Exhaust Ports In Two Or More Planes Patents (Class 123/65A)
  • Two stroke cycle internal combustion engine
    Patent number: 4174685
    Abstract: A two-stroke cycle internal combustion engine wherein the cylinder is provided with spaced inlet ports with an intermediate wall section therebetween and the piston face is provided with a T-shaped guide outstanding therefrom, the center leg of the guide terminating in a face, which confronts the intermediate wall section when the piston is at bottom dead center, the face increasing in width from the outer edge of the guide leg to the root thereof.
    Type: Grant
    Filed: July 5, 1978
    Date of Patent: November 20, 1979
    Assignee: AB Volvo Penta
    Inventor: Hermann R. E. Meier
  • Exhaust means for two cycle engines
    Patent number: 4121552
    Abstract: Two cycle internal combustion engines including a cylinder which is provided with one or more exhaust ports adapted to be closed by piston reciprocating in the cylinder. A valve member is provided in co-operation with the upper portion or upper one of the exhaust ports. Said valve member may be interconnected with the engine throttle valve in such a manner that it is closed under lower speed operation and opened under high speed operation of the engine so as to obtain optimum exhaust valve timing throughout the engine operating speed range.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: October 24, 1978
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Nagahama Mithuo, Aoi Kazuo, Hirano Seiji