Patents by Inventor Naohisa Nakashima

Naohisa Nakashima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Combustion chamber for diesel engines
    Patent number: 5097807
    Abstract: The disclosure relates to a novel arrangement of a combustion chamber for diesel engines, which is defined by an inner wall including a fuel-impinging area formed of a metallic material, and a remaining area which at least partly is formed of a ceramic material or a like heat-resisting material. The arrangement serves to achieve an effective exhaust gas clarification, including the minimization of NOx emission, and to realize increased power output and reduced fuel consumption of the engine.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: March 24, 1992
    Assignees: Mitsubishi Motors Corporation, NGK Insulators, Ltd.
    Inventors: Hiroshi Oikawa, Naohisa Nakashima, Minoru Matsui, Tadao Ozawa
  • Direct injection-type diesel engines
    Patent number: 4953528
    Abstract: A direct injection-type diesel engine includes a piston head formed with a novel piston combustion chamber, with an inner wall surface composed essentially of ceramic material having a low thermal conductivity. The combustion chamber has a reduced opening diameter to enhance a squish air flow out of the clearance space between the piston and the cylinder head, and allows significant reduction of smoke, unburnt hydrocarbon and particulates in the exhaust gas, as well as minimization of thermal loss of the engine.
    Type: Grant
    Filed: October 5, 1989
    Date of Patent: September 4, 1990
    Assignees: Mitsubishi Jidosha Kogya Kabushiki Kaisha, NGK Insulators, Ltd.
    Inventors: Hiroshi Oikawa, Naohisa Nakashima, Tadaaki Matsuhisa, Tadao Ozawa