Patents by Inventor Shigeki Kawakita

Shigeki Kawakita 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).

  • Inlet valve, internal combustion engine and transportation apparatus including the same
    Patent number: 8245682
    Abstract: An inlet valve includes a valve head including a valve surface located at a circumferential edge portion, and a single annular circumferential edge groove disposed radially inside and close to the valve surface in the circumferential edge portion. When intake air (an airflow) proceeds along a surface of the valve head and reaches the circumferential edge portion, only a portion thereof (a partial airflow) enters the circumferential edge groove and the remaining thereof (remaining partial airflow) passes by the circumferential edge groove. As the intake air (the partial airflow) having entered the circumferential edge groove forms a turbulent flow, the intake air surrounds the circumferential edge portion of the valve head and reaches below the circumferential edge portion of the valve head, thereby achieving an increase in volume of air taken into a combustion chamber.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: August 21, 2012
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Kenji Nishida, Shigeki Kawakita
  • INLET VALVE, INTERNAL COMBUSTION ENGINE AND TRANSPORTATION APPARATUS INCLUDING THE SAME
    Publication number: 20110030642
    Abstract: An inlet valve includes a valve head including a valve surface located at a circumferential edge portion, and a single annular circumferential edge groove disposed radially inside and close to the valve surface in the circumferential edge portion. When intake air (an airflow) proceeds along a surface of the valve head and reaches the circumferential edge portion, only a portion thereof (a partial airflow) enters the circumferential edge groove and the remaining thereof (remaining partial airflow) passes by the circumferential edge groove. As the intake air (the partial airflow) having entered the circumferential edge groove forms a turbulent flow, the intake air surrounds the circumferential edge portion of the valve head and reaches below the circumferential edge portion of the valve head, thereby achieving an increase in volume of air taken into a combustion chamber.
    Type: Application
    Filed: February 1, 2010
    Publication date: February 10, 2011
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Kenji Nishida, Shigeki Kawakita