Patents by Inventor Toshiaki Nagayama

Toshiaki Nagayama 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).

  • Fuel pump and direct fuel injection engine
    Patent number: 6860255
    Abstract: A fuel pump, of which sliding mechanism parts in its fuel chamber have good wear resistance under a severe environment, and a direct fuel injection engine using the fuel pump are provided. In a fuel pump for pressurizing and delivering fuel to a fuel injector of a vehicle engine, at least one of sliding surfaces of a slant plate, a slipper and a plunger sliding in a lubricating oil and at least one of sliding surfaces of sliding members of a plunger and a cylinder contacting with and sliding on each other through the fuel are formed of a hardened layer composed of any one of a nitrided layer, a carburization quenched layer and a carbonitrided layer, or coated with a high corrosion resistant and hard metal compound layer over the hardened layer.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: March 1, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Shizuka Yamaguchi, Noboru Baba, Toshiaki Nagayama, Katsuyoshi Terakado, Arata Kagiyama, Hideki Machimura, Hiroyuki Yamada, Yukio Takahashi, Masayoshi Kotaki, Kazuo Ojima
  • Fuel pump and direct fuel injection engine
    Publication number: 20030089343
    Abstract: A fuel pump, of which sliding mechanism parts in its fuel chamber have good wear resistance under a severe environment, and a direct fuel injection engine using the fuel pump are provided.
    Type: Application
    Filed: February 28, 2002
    Publication date: May 15, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Shizuka Yamaguchi, Noboru Baba, Toshiaki Nagayama, Katsuyoshi Terakado, Arata Kagiyama, Hideki Machimura, Hiroyuki Yamada, Yukio Takahashi, Masayoshi Kotaki, Kazuo Ojima