Patent ID: 6170458
Filing Date: 2001-01-09
Classification: F02B,F02F,F02M,H01T,Y02T

Abstract:
A direct injection combustion engine comprising:a combustion chamber, including a fuel intake port, an air intake port and a spark plug insertion opening;a spark plug including a threaded shell having a firing end, a firing electrode, a ground electrode, and an insulator core nose extending substantially beyond the firing end of the threaded shell, the spark plug being installed in the opening so that the firing electrode, the ground electrode, and the insulator core nose extend into the chamber; anda shield extending from the spark plug and positioned between the fuel intake port and the spark plug insertion opening and configured to reduce the flow of fuel from the fuel intake port to the insulator core nose, including the portion of the core nose extending into the chamber, without preventing flow of fuel directly from the fuel intake port to a spark gap defined between the firing electrode and the ground electrode, wherein the shield has a length that is sufficient to protect the insulator core nose but not an excessive length so as to block the flow of fuel from reaching the spark plug gap.