Patents by Inventor Junichi Hirakawa

Junichi Hirakawa 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).

  • Propeller shaft for motor vehicle
    Patent number: 7922394
    Abstract: In a propeller shaft for a motor vehicle, an outer periphery of an outer end of an annular support member is formed as an expanded poison.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: April 12, 2011
    Assignee: Showa Corporation
    Inventors: Junichi Hirakawa, Toru Yamada
  • Shock absorbing structure of propeller shaft
    Patent number: 7717796
    Abstract: When an inner ring portion of a tripod is brought into contact with a protruding portion, the inner ring portion is brought into contact with the protruding portion because an outer diameter of the protruding portion is smaller than a diameter of a tilted outer end portion of the inner ring portion. Since the inner ring portion is tilted with respect to an axial direction, the inner ring portion is brought into contact with the protruding portion by a point (a line) not by a surface. If the inner ring portion is brought into contact with the protruding portion by the point, a stress concentration is generated at the point with which the protruding portion is brought into contact, a small impact force overcomes a breaking load of the protruding portion in the stress concentration portion, and the stress concentration portion is easily broken (plastically deformed).
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: May 18, 2010
    Assignee: Showa Corporation
    Inventor: Junichi Hirakawa
  • Propeller Shaft for Motor Vehicle
    Publication number: 20080267550
    Abstract: In a propeller shaft for a motor vehicle, an outer periphery of an outer end of an annular support member is formed as an expanded poison.
    Type: Application
    Filed: November 30, 2007
    Publication date: October 30, 2008
    Applicant: SHOWA CORPORATION
    Inventors: Junichi Hirakawa, Toru Yamada
  • Shock absorbing structure of propeller shaft
    Publication number: 20070123359
    Abstract: When an inner ring portion of a tripod is brought into contact with a protruding portion, the inner ring portion is brought into contact with the protruding portion because an outer diameter of the protruding portion is smaller than a diameter of a tilted outer end portion of the inner ring portion. Since the inner ring portion is tilted with respect to an axial direction, the inner ring portion is brought into contact with the protruding portion by a point (a line) not by a surface. If the inner ring portion is brought into contact with the protruding portion by the point, a stress concentration is generated at the point with which the protruding portion is brought into contact, a small impact force overcomes a breaking load of the protruding portion in the stress concentration portion, and the stress concentration portion is easily broken (plastically deformed).
    Type: Application
    Filed: May 30, 2006
    Publication date: May 31, 2007
    Applicant: Showa Corporation
    Inventor: Junichi Hirakawa