Patents by Inventor Kosuke Shibairi

Kosuke Shibairi 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).

  • COIL SPRING, SUSPENSION DEVICE, AND METHOD FOR PRODUCING COIL SPRING
    Publication number: 20240133440
    Abstract: According to an embodiment, a coil spring is formed of a wire which is helically wound, and includes an end turn portion and an effective portion, and a surface of the wire in the end turn portion includes an area which is softer than a surface of the wire in the effective portion.
    Type: Application
    Filed: December 29, 2023
    Publication date: April 25, 2024
    Applicant: NHK SPRING CO., LTD.
    Inventors: Hideki OKADA, Yuichiro YAMAUCHI, Ryo TANAKA, Takeshi SUZUKI, Kosuke SHIBAIRI
  • Spring and manufacture method thereof
    Patent number: 11378147
    Abstract: A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.
    Type: Grant
    Filed: September 3, 2019
    Date of Patent: July 5, 2022
    Assignee: NHK SPRING CO., LTD.
    Inventors: Takeshi Suzuki, Yoshiki Ono, Shimpei Kurokawa, Kosuke Shibairi
  • SPRING AND MANUFACTURE METHOD THEREOF
    Publication number: 20190390727
    Abstract: A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.
    Type: Application
    Filed: September 3, 2019
    Publication date: December 26, 2019
    Applicant: NHK SPRING CO., LTD.
    Inventors: Takeshi SUZUKI, Yoshiki ONO, Shimpei KUROKAWA, Kosuke SHIBAIRI
  • SPRING AND MANUFACTURE METHOD THEREOF
    Publication number: 20130118655
    Abstract: A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.
    Type: Application
    Filed: August 4, 2011
    Publication date: May 16, 2013
    Applicant: NHK SPRING CO., LTD.
    Inventors: Takeshi Suzuki, Yoshiki Ono, Shimpei Kurokawa, Kosuke Shibairi