Patents by Inventor Tsugunori Konakawa

Tsugunori Konakawa 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).

  • Publication number: 20070289583
    Abstract: An injector bracket 10 is provided inside an air cleaner 5. The injector bracket 10 comprises a rectifying wall 10a bulging into a main chamber 5b, and a stream-line guide wall 10b in opposition to an air current M having passed through an element 8. The injector bracket 10 functions as a partition and forms a separate chamber 10e partitioned from the main chamber 5b in the air cleaner 5. An upstream injector unit 7 is arranged in the separate chamber 10e. The rectifying wall 10a is in the form of a symmetric blade.
    Type: Application
    Filed: November 22, 2004
    Publication date: December 20, 2007
    Inventors: Tsugunori Konakawa, Mitsutoshi Koide, Hiroaki Ito, Takahiro Ozawa
  • Publication number: 20050205067
    Abstract: A fuel supply system has an air chamber that contains a fuel injector. At least one aperture is formed in a substantially lowermost portion of a lower surface of the air chamber. The aperture and the lower surface have a generally uninterrupted or smooth transition or interface.
    Type: Application
    Filed: March 22, 2005
    Publication date: September 22, 2005
    Inventors: Mitsutosi Koide, Tsugunori Konakawa, Kazuya Nishizawa
  • Patent number: 5823150
    Abstract: A number of embodiments of induction system arrangements for a two cycle crankcase compression internal combustion engine having reed valve assemblies comprised of a mounting portion that defines a flow passage and a first caging member that divides the flow passage into first and second sections. A second caging member is affixed to the first caging member and the means which affixes it also affix a first reed valve for valving a valved opening in the first caging member. The valved openings in the caging members are generally rectangular in configuration and have a cross-sectional flow area approximately equal to the cross-sectional flow area of the intake passage in which the reed valve assembly is positioned. At least a pair of generally circular induction passages serve each reed valve member and a variety of different types of throttle valve arrangements and injection patterns are disclosed.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: October 20, 1998
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Tsugunori Konakawa
  • Patent number: 5367998
    Abstract: A fuel injection and control system for a V-type, two cycle, crankcase compression, internal combustion engine. The fuel injection system includes fuel injectors positioned in the valley of the engine and which are supplied with fuel under pressure from a fuel tank through a line in which a fuel filter and fuel pump are positioned. The fuel pump and fuel filter are disposed at one end of the engine and the amount of pressure supplied to the fuel injectors is controlled by a pressure regulator that regulates pressure by bypassing excess fuel back to the fuel filter upstream of the filter element. A throttle control and throttle position sensor are disposed at the opposite end of the engine and exhaust control valves are provided outside of the valley of the "V" of the engine.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: November 29, 1994
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Masakazu Shiohara, Tsugunori Konakawa