Patents by Inventor Kenichi Niinuma

Kenichi Niinuma 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 supply pump and manufacturing method of housing of the same
    Patent number: 9151290
    Abstract: A cylinder body includes a cylinder hole and a discharge flow passage. The cylinder hole receives a plunger and forms a pressurizing chamber in one axial end portion thereof. The discharge flow passage is connected to the pressurizing chamber and is adapted to guide and discharge the pressurized fuel from the pressurizing chamber to an outside of the housing. A connection opening of the discharge flow passage is formed in a hole wall of the cylinder hole. A pressure is applied to a predetermined prestressing subject area in the hole wall of the cylinder hole and a passage wall of the discharge flow passage through autofrettage to generate a residual compression stress in the predetermined prestressing subject area and thereby to form a prestressed area of a final product. The prestressing subject area includes an inner peripheral edge of the connection opening.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: October 6, 2015
    Assignee: DENSO CORPORATION
    Inventors: Tetsuya Yoshimura, Katsumi Mori, Kenichi Niinuma
  • FUEL SUPPLY PUMP AND MANUFACTURING METHOD OF HOUSING OF THE SAME
    Publication number: 20120152112
    Abstract: A cylinder body includes a cylinder hole and a discharge flow passage. The cylinder hole receives a plunger and forms a pressurizing chamber in one axial end portion thereof. The discharge flow passage is connected to the pressurizing chamber and is adapted to guide and discharge the pressurized fuel from the pressurizing chamber to an outside of the housing. A connection opening of the discharge flow passage is formed in a hole wall of the cylinder hole. A pressure is applied to a predetermined prestressing subject area in the hole wall of the cylinder hole and a passage wall of the discharge flow passage through autofrettage to generate a residual compression stress in the predetermined prestressing subject area and thereby to form a prestressed area of a final product. The prestressing subject area includes an inner peripheral edge of the connection opening.
    Type: Application
    Filed: November 16, 2011
    Publication date: June 21, 2012
    Applicant: DENSO CORPORATION
    Inventors: Tetsuya YOSHIMURA, Katsumi Mori, Kenichi Niinuma