Patents by Inventor Seiji Niinuma

Seiji Niinuma 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).

  • Helical intake port for an internal combustion engine
    Patent number: 6003485
    Abstract: This invention relates to a helical intake port for an internal combustion engine comprising a straight passage, a swirl passage connected to the straight passage and formed in a spiral around the center of an intake valve, and a cylindrical throat connected to the swirl passage via an opening over the whole area of the swirl passage. The cross-sectional area S of the swirl passage is determined by the following equation: ##EQU1## where: .beta.=swirl angle from swirl start position,.beta.0=whole swirl angle from swirl start position to swirl end position of swirl passage,S0=cross-sectional area of swirl passage at swirl start position.As a result, swirl can be enhanced and a high flow coefficient of the intake port can be realized.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: December 21, 1999
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Junichi Kawashima, Toshifumi Nishimura, Seiji Niinuma