Patents by Inventor Kazunori Kusama

Kazunori Kusama 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).

  • Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption
    Patent number: 7036823
    Abstract: A side rail is formed into a ring shape having its generally rectangular section that has an outer surface 3 formed with a pair of edge surfaces 5 of small radius, and an intermediate surface 6 of large radius of curvature formed between the edge surfaces 5. When the side rail is in the inclined condition in operation, each edge surface 5 can easily ride on oil film on cylinder 16 and allow the side rail 1 to perform smooth sliding movement on the inner surface of cylinder. The intermediate surface 6 efficiently scrapes lubricating oil on cylinder to form lubricating oil film of necessary and minimum thickness between an inner surface 17 of cylinder 16 and side rail 1. Also, the larger radius of curvature for forming the intermediate surface 6 provides a larger contact area to the inner surface 17 of cylinder 16 to improve wear resistance.
    Type: Grant
    Filed: December 25, 2002
    Date of Patent: May 2, 2006
    Assignee: Riken Corporation
    Inventors: Katsumi Takiguchi, Kazunori Kusama
  • Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption
    Publication number: 20040061291
    Abstract: A side rail is formed into a ring shape having its generally rectangular section that has an outer surface 3 formed with a pair of edge surfaces 5 of small radius, and an intermediate surface 6 of large radius of curvature formed between the edge surfaces 5. When the side rail is in the inclined condition in operation, each edge surface 5 can easily ride on oil film on cylinder 16 and allow the side rail 1 to perform smooth sliding movement on the inner surface of cylinder. The intermediate surface 6 efficiently scrapes lubricating oil on cylinder to form lubricating oil film of necessary and minimum thickness between an inner surface 17 of cylinder 16 and side rail 1. Also, the larger radius of curvature for forming the intermediate surface 6 provides a larger contact area to the inner surface 17 of cylinder 16 to improve wear resistance.
    Type: Application
    Filed: August 7, 2003
    Publication date: April 1, 2004
    Inventors: Katsumi Takiguchi, Kazunori Kusama
  • Piston for internal combustion engines
    Patent number: 5323744
    Abstract: A piston for an internal combustion engine in which a land located immediately above an oil-ring groove and/or a pressure ring groove of the piston is provided with an annular groove-shaped recess at least around an intermediate portion of the land. The annular groove-shaped recess gradually increases in depth from zero upward along the axial direction of the piston to form an oil reservoir.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: June 28, 1994
    Assignee: Kabushiki Kaisha Riken
    Inventors: Kazunori Kusama, Hideki Yoshida