Patents by Inventor Hirofumi Somekawa

Hirofumi Somekawa 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).

  • Coupling member of power transmission apparatus
    Patent number: 7074129
    Abstract: A coupling member for a power transmission apparatus, connected to a fiber reinforced plastic cylindrical drive shaft, is comprised of a substantially cylindrical fitting portion to be press fitted into the drive shaft. The fitting portion is comprised of a serration portion formed in the axial direction on an outer circumferential surface of the fitting portion. The edge of the fitting portion has an inclined guide surface. The tip area of the guide surface is a guide portion with a smaller outer diameter than an inner diameter of an end portion of the drive shaft. An area between the guide portion and the outer circumferential surface of the fitting portion is a cut away portion continuing from the serration portion. A tapering angle of the cut away portion is smaller than of the guide portion.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: July 11, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Sugiyama, Katsuro Kawahara, Hirofumi Somekawa
  • Coupling member of power transmission apparatus
    Publication number: 20030207715
    Abstract: A coupling member for a power transmission apparatus, connected to a fiber reinforced plastic cylindrical drive shaft, is comprised of a substantially cylindrical fitting portion to be press fitted into the drive shaft. The fitting portion is comprised of a serration portion formed in the axial direction on an outer circumferential surface of the fitting portion. The edge of the fitting portion has an inclined guide surface. The tip area of the guide surface is a guide portion with a smaller outer diameter than an inner diameter of an end portion of the drive shaft. An area between the guide portion and the outer circumferential surface of the fitting portion is a cut away portion continuing from the serration portion. A tapering angle of the cut away portion is smaller than of the guide portion.
    Type: Application
    Filed: March 28, 2003
    Publication date: November 6, 2003
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Kenichi Sugiyama, Katsuro Kawahara, Hirofumi Somekawa