Patents by Inventor Hayato ISHIGAMI

Hayato ISHIGAMI 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).

  • Indentation resistance measurement method, indentation resistance prediction method for rolling bearings, machining condition selection method, bearing material quality selection method, burnishing condition selection method, and bearing manufacturing method
    Patent number: 11965556
    Abstract: A method for measuring indentation resistance includes: obtaining a first curve indicating a yield shear stress in a depth direction of a raceway surface of a material forming a rolling bearing in a state before the raceway surface is subjected to machining, a second curve indicating a static shear stress in the depth direction of the raceway surface in a state in which the raceway surface is subjected to the machining, and a third curve indicating a static shear stress in the depth direction of the raceway surface in a state in which rolling elements are in contact with the raceway surface and a static load is applied to the raceway surface; and obtaining a correlation between an area and an indentation depth of the raceway ring by defining a region surrounded by exceeding the first curve and the second curve and falling below the third curve as the area.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: April 23, 2024
    Assignee: NSK LTD.
    Inventors: Hirofumi Ito, Takahito Shimada, Masahide Natori, Hideyuki Hidaka, Hayato Ishigami, Hiroki Komata
  • INDENTATION RESISTANCE MEASUREMENT METHOD, INDENTATION RESISTANCE PREDICTION METHOD FOR ROLLING BEARINGS, MACHINING CONDITION SELECTION METHOD, BEARING MATERIAL QUALITY SELECTION METHOD, BURNISHING CONDITION SELECTION METHOD, AND BEARING MANUFACTURING METHOD
    Publication number: 20220268316
    Abstract: A method for measuring indentation resistance includes: obtaining a first curve indicating a yield shear stress in a depth direction of a raceway surface of a material forming a rolling bearing in a state before the raceway surface is subjected to machining, a second curve indicating a static shear stress in the depth direction of the raceway surface in a state in which the raceway surface is subjected to the machining, and a third curve indicating a static shear stress in the depth direction of the raceway surface in a state in which rolling elements are in contact with the raceway surface and a static load is applied to the raceway surface; and obtaining a correlation between an area and an indentation depth of the raceway ring by defining a region surrounded by exceeding the first curve and the second curve and falling below the third curve as the area.
    Type: Application
    Filed: April 7, 2021
    Publication date: August 25, 2022
    Applicant: NSK Ltd.
    Inventors: Hirofumi ITO, Takahito SHIMADA, Masahide NATORI, Hideyuki HIDAKA, Hayato ISHIGAMI, Hiroki KOMATA