Patents by Inventor Tatsumi Yunokawa

Tatsumi Yunokawa 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).

  • Hollow cam shaft
    Patent number: 4730581
    Abstract: A hollow cam shaft for use in an internal combustion engine is disclosed. The cam shaft includes a steel pipe, a journal portion and a cam portion. The journal portion is provided at a part of the outer peripheral surface of the steel pipe and having an outer diameter smaller than that of the steel pipe. A cam lobe is assembled on the other portion of the outer peripheral surface of the steel pipe. The journal portion is formed by cutting the part of the outer peripheral surface of the steel pipe by a uniform axial length and radial depth.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: March 15, 1988
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Yoshiaki Fujita, Tatsumi Yunokawa