Patents by Inventor Yuki KUROMASA

Yuki KUROMASA 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).

  • Cylinder liner and manufacturing method for same
    Patent number: 11499498
    Abstract: A cylinder liner of the present invention is a cylinder liner mounted on a cylinder block and formed of flaky graphite cast iron, at least a nitrided layer is provided on an inner periphery of the cylinder liner, and a cross hatching section is formed on the inner periphery, a roughness curve of the inner periphery has a plateau honing shape, a ten-point average roughness Rz of the inner periphery pursuant to JIS B0601:1982 is 4.0 ?m or less, and an average value of an area ratio of pits generated in the inner periphery is 8% or less.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: November 15, 2022
    Assignees: TPR CO., LTD., TPR INDUSTRY CO., LTD.
    Inventors: Yuki Kuromasa, Koichi Hatakeyama, Takashi Ozawa
  • CYLINDER LINER AND MANUFACTURING METHOD FOR SAME
    Publication number: 20220025829
    Abstract: A cylinder liner of the present invention is a cylinder liner mounted on a cylinder block and formed of flaky graphite cast iron, at least a nitrided layer is provided on an inner periphery of the cylinder liner, and a cross hatching section is formed on the inner periphery, a roughness curve of the inner periphery has a plateau honing shape, a ten-point average roughness Rz of the inner periphery pursuant to JIS B0601:1982 is 4.0 ?m or less, and an average value of an area ratio of pits generated in the inner periphery is 8% or less.
    Type: Application
    Filed: July 23, 2019
    Publication date: January 27, 2022
    Inventors: Yuki KUROMASA, Koichi HATAKEYAMA, Takashi OZAWA