Patents by Inventor Shinichiro KUWATSUKA

Shinichiro KUWATSUKA 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).

  • Stabilizer
    Patent number: 11111554
    Abstract: A stabilizer formed by using a metal bar having a solid structure and configured to reduce a displacement between right and left wheels, including a torsion part extending in a vehicle width direction, being capable of a torsional deformation, and having a diameter of 10 to 32 mm, is provided. The stabilizer has a chemical composition containing at least C: 0.15% by mass or more to 0.39% by mass or less, Mn, B, and Fe, and also has a metal structure 90% or more of which is a martensite structure.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: September 7, 2021
    Assignee: NHK SPRING CO., LTD.
    Inventors: Shinichiro Kuwatsuka, Yurika Okudaira, Akira Tange, Hideki Okada, Ken Takahashi
  • Production method for stabilizers
    Patent number: 10995382
    Abstract: The invention provides a production method for stabilizers which produces with high productivity in a compact production line, without tempering. The production method for stabilizers of the invention includes: forming a steel bar material containing at least C: 0.15 wt % to 0.39 wt %, Mn, B and Fe into a product shape by bending; and quenching the bent steel bar material in a medium having a heat transfer coefficient higher than or close to that of water.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: May 4, 2021
    Assignee: NHK SPRING CO., LTD.
    Inventors: Shinichiro Kuwatsuka, Yurika Okudaira, Akira Tange, Hideki Okada, Ken Takahashi
  • Leaf spring device and method for manufacturing leaf spring device
    Patent number: 10549594
    Abstract: A leaf spring device includes a main leaf made of a steel plate including an elastic section configured to generate elastic force when bent; and an eye section formed in an end portion of the elastic section, the elastic section and the eye section being tempered. There is also provided a method for manufacturing the leaf spring device. The eye section is formed by rolling the end of the elastic section into a circular form. The eye section is tempered at a higher temperature than the elastic section.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: February 4, 2020
    Assignee: NHK SPRING CO., LTD.
    Inventors: Hidenori Chihara, Hiroto Tsuji, Shinichiro Kuwatsuka
  • STABILIZER
    Publication number: 20170349962
    Abstract: A stabilizer formed by using a metal bar having a solid structure and configured to reduce a displacement between right and left wheels, including a torsion part extending in a vehicle width direction, being capable of a torsional deformation, and having a diameter of 10 to 32 mm, is provided. The stabilizer has a chemical composition containing at least C: 0.15% by mass or more to 0.39% by mass or less, Mn, B, and Fe, and also has a metal structure 90% or more of which is a martensite structure.
    Type: Application
    Filed: December 4, 2015
    Publication date: December 7, 2017
    Inventors: Shinichiro KUWATSUKA, Yurika OKUDAIRA, Akira TANGE, Hideki OKADA, Ken TAKAHASHI
  • PRODUCTION METHOD FOR STABILIZERS
    Publication number: 20170349961
    Abstract: The invention provides a production method for stabilizers which produces with high productivity in a compact production line, without tempering. The production method for stabilizers of the invention includes: forming a steel bar material containing at least C: 0.15 wt % to 0.39 wt %, Mn, B and Fe into a product shape by bending; and quenching the bent steel bar material in a medium having a heat transfer coefficient higher than or close to that of water.
    Type: Application
    Filed: December 7, 2015
    Publication date: December 7, 2017
    Inventors: Shinichiro KUWATSUKA, Yurika OKUDAIRA, Akira TANGE, Hideki OKADA, Ken TAKAHASHI
  • LEAF SPRING DEVICE AND METHOD FOR MANUFACTURING LEAF SPRING DEVICE
    Publication number: 20170313149
    Abstract: A leaf spring device includes a main leaf made of a steel plate including an elastic section configured to generate elastic force when bent; and an eye section formed in an end portion of the elastic section, the elastic section and the eye section being tempered. There is also provided a method for manufacturing the leaf spring device. The eye section is formed by rolling the end of the elastic section into a circular form. The eye section is tempered at a higher temperature than the elastic section.
    Type: Application
    Filed: November 10, 2015
    Publication date: November 2, 2017
    Inventors: Hidenori CHIHARA, Hiroto TSUJI, Shinichiro KUWATSUKA