Patents by Inventor Seeroku HOSHINO

Seeroku HOSHINO 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).

  • Patent number: 10890255
    Abstract: Under a state in which the combination oil ring is mounted in an oil ring groove before inserted into a cylinder bore, when an inclined surface of an upper ear portion of an expander spacer is held in contact with an inner peripheral surface of an upper segment and an inclined surface of a lower ear portion of the expander spacer is held in contact with an inner peripheral surface of a lower segment, an upper protrusion amount (P1) from an outer peripheral-side end surface of the expander spacer to an outer peripheral surface vertex of the upper segment is larger than a lower protrusion amount (P2) from the outer peripheral-side end surface of the expander spacer to an outer peripheral surface vertex of the lower segment. When the combination oil ring is inserted into the cylinder bore, the sealing performance can be improved to reduce the oil consumption.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: January 12, 2021
    Assignee: TPR CO., LTD.
    Inventors: Seeroku Hoshino, Hirofumi Osada, Seiji Tamaki
  • Publication number: 20200256277
    Abstract: To reduce a friction, and to provide an excellent seizing resistance. Provided is a cast iron cylinder liner including an inner peripheral sliding surface made of cast iron, and an internal combustion engine including a cylinder bore including an inner peripheral sliding surface made of cast iron, wherein the inner peripheral sliding surface includes a region satisfying Expression (1) to Expression (3), Rvk/Rk?1.0 ??Expression (1) 0.08 ?m?Rk?0.3 ?m Expression (2) Rk?Rpk>0 Expression (3) [Rk is the core roughness depth based on JIS B0671-2:2002, Rpk is the reduced peak height based on JIS B0671-2:2002, and Rvk is the reduced valley depth based on JIS B0671-2:2002 in Expression (1) to Expression (3)].
    Type: Application
    Filed: July 5, 2019
    Publication date: August 13, 2020
    Applicants: TPR CO., LTD., TPR INDUSTRY CO., LTD.
    Inventors: Kiyoyuki KAWAI, Shinji AMAIKE, Tetsuya NANGO, Seiji TAMAKI, Seeroku HOSHINO, Wataru SUZUKI, Takashi OIZUMI, Hiroshi YAGUCHI, Takashi SUZUKI
  • Publication number: 20200166135
    Abstract: Under a state in which the combination oil ring is mounted in an oil ring groove before inserted into a cylinder bore, when an inclined surface of an upper ear portion of an expander spacer is held in contact with an inner peripheral surface of an upper segment and an inclined surface of a lower ear portion of the expander spacer is held in contact with an inner peripheral surface of a lower segment, an upper protrusion amount (P1) from an outer peripheral-side end surface of the expander spacer to an outer peripheral surface vertex of the upper segment is larger than a lower protrusion amount (P2) from the outer peripheral-side end surface of the expander spacer to an outer peripheral surface vertex of the lower segment. When the combination oil ring is inserted into the cylinder bore, the sealing performance can be improved to reduce the oil consumption.
    Type: Application
    Filed: July 30, 2018
    Publication date: May 28, 2020
    Applicant: TPR CO., LTD.
    Inventors: Seeroku HOSHINO, Hirofumi OSADA, Seiji TAMAKI