Patents by Inventor Tetsuya HIRONAKA

Tetsuya HIRONAKA 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).

  • Bearing constituent member, method of manufacturing bearing constituent member, and rolling bearing
    Patent number: 10047797
    Abstract: A bearing constituent member includes a base material including steel and a carbonitrided layer that is a surface layer on the steel, the steel including 0.3 to 0.45 mass % of carbon, 0.5 mass % or lower of silicon, 0.4 to 1.5 mass % of manganese, 0.3 to 2 mass % of chromium, 0.1 to 0.35 mass % of molybdenum, 0.2 to 0.4 mass % of vanadium, and a remainder of iron and unavoidable impurities. Surface Vickers hardness at a position at a depth of 50 ?m from a surface of a rolling sliding surface is 700 to 800, internal hardness is 550 to 690 in terms of Vickers hardness, and an amount of residual austenite in a range from the surface to a depth of 10 ?m is at least 30 vol %.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: August 14, 2018
    Assignees: JTEKT CORPORATION, NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi Sada, Kohei Kanetani, Takahiro Shimano, Tetsuya Hironaka, Yutaka Neishi, Tomohiro Yamashita
  • BEARING CONSTITUENT MEMBER, METHOD OF MANUFACTURING BEARING CONSTITUENT MEMBER, AND ROLLING BEARING
    Publication number: 20170167538
    Abstract: A bearing constituent member includes a base material including steel and a carbonitrided layer that is a surface layer on the steel, the steel including 0.3 to 0.45 mass % of carbon, 0.5 mass % or lower of silicon, 0.4 to 1.5 mass % of manganese, 0.3 to 2 mass % of chromium, 0.1 to 0.35 mass % of molybdenum, 0.2 to 0.4 mass % of vanadium, and a remainder of iron and unavoidable impurities. Surface Vickers hardness at a position at a depth of 50 ?m from a surface of a rolling sliding surface is 700 to 800, internal hardness is 550 to 690 in terms of Vickers hardness, and an amount of residual austenite in a range from the surface to a depth of 10 ?m is at least 30 vol %.
    Type: Application
    Filed: December 1, 2016
    Publication date: June 15, 2017
    Applicants: JTEKT CORPORATION, NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi SADA, Kohei KANETANI, Takahiro SHIMANO, Tetsuya HIRONAKA, Yutaka NEISHI, Tomohiro YAMASHITA