Patents by Inventor Takashige Nagato

Takashige Nagato 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).

  • Steel material for high strength constant velocity joint intermediate shaft and high strength constant velocity joint intermediate shaft
    Patent number: 7438771
    Abstract: A steel material for a high strength constant velocity joint intermediate shaft is provided. The steal material may preferably contain C: 0.46 to 0.52%, Si: 0.6 to 0.8%, Mn: 0.7 to 0.9%, S: 0.01 to 0.05%, Mo: 0.3 to 0.5%, B: 0.0005 to 0.005%, Al: 0.002 to 0.05%, and Ti: 0.02 to 0.09%, restricting N to 0.007% or less, Cr to 0.15% or less, and P to 0.02% or less. A structural percentage of bainite+martensite may be provided which is 40% or more. The steal material may have a hardness of 250 HV to 340 HV. A high strength constant velocity joint intermediate shaft made of that steel material may be provided which has a spline-vanishing part with a surface hardness of about 610 HV to 750 HV, and a ratio t/r of an effective hardened layer depth t and radius r of 0.35 to 0.55, having a flat part with a surface hardness of about 630 HV to 770 HV and a ratio t/r of 0.55 to 1.0, and having a core hardness of about 250 HV to 340 HV.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: October 21, 2008
    Assignees: Nippon Steel Corporation, Toyoda Koki Kabushiki Kaisha
    Inventors: Takashige Nagato, Tatsuro Ochi, Koji Nishi, Yuji Inagaki, Kazuyuki Ichikawa, Isashi Kashiwagi, Toshiyuki Saito
  • Steel material for high strength constant velocity joint intermediate shaft and high strength constant velocity joint intermediate shaft
    Publication number: 20060076088
    Abstract: A steel material for a high strength constant velocity joint intermediate shaft is provided. The steal material may preferably contain C: 0.46 to 0.52%, Si: 0.6 to 0.8%, Mn: 0.7 to 0.9%, S: 0.01 to 0.05%, Mo: 0.3 to 0.5%, B: 0.0005 to 0.005%, Al: 0.002 to 0.05%, and Ti: 0.02 to 0.09%, restricting N to 0.007% or less, Cr to 0.15% or less, and P to 0.02% or less. A structural percentage of bainite+martensite may be provided which is 40% or more. The steal material may have a hardness of 250 HV to 340 HV. A high strength constant velocity joint intermediate shaft made of that steel material may be provided which has a spline-vanishing part with a surface hardness of about 610 HV to 750 HV, and a ratio t/r of an effective hardened layer depth t and radius r of 0.35 to 0.55, having a flat part with a surface hardness of about 630 HV to 770 HV and a ratio t/r of 0.55 to 1.0, and having a core hardness of about 250 HV to 340 HV.
    Type: Application
    Filed: October 13, 2005
    Publication date: April 13, 2006
    Inventors: Takashige Nagato, Tatsuro Ochi, Koji Nishi, Yuji Inagaki, Kazuyuki Ichikawa, Isashi Kashiwagi, Toshiyuki Saito