Patents by Inventor Kouhei Yamaishi

Kouhei Yamaishi 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).

  • Cylinder head structure
    Patent number: 6123055
    Abstract: A cylinder head structure for an engine, including grooves (18; 12a) in a top surface (2; 2a) of a cylinder head body (1; 1a) such that they surround an associated a fuel injection nozzle hole (11; 8a). Valve tappet guide holes (6; 3a) are also formed in the top surface (2; 2a) of the cylinder head body (1; 1a) around each of the fuel injection nozzle holes (11; 8a). The grooves (18; 12a) connect the adjacent tappet guide holes (6; 3a) and surround the associated nozzle or spark plug hole. Cylinder head bolt holes (15; 9a) are also formed around the tappet guide holes (6; 3a). When cylinder head bolts are tightened to join the cylinder head with a cylinder block, a radiant tension (F) is generated from the cylinder head bolt heads which are in contact with the cylinder head top surface. This radiant tension would cause cracking around the injection nozzle hole (11; 8a).
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: September 26, 2000
    Assignee: Isuzu Motors Limited
    Inventors: Makoto Takeuchi, Tomoaki Kakihara, Hidetsugu Watanabe, Jun Otsuka, Toshiyuki Usui, Kouhei Yamaishi