Internal combustion engine
AssigneeNGK Insulators, Ltd.
InventorsShingo IWASAKI, Masahiro KIDA, Yoshihiro YAMAMOTO, Tomonori URUSHIHARA
Life of this patent
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Abstract
An internal combustion engine 20 includes a combustion chamber 26, a fuel injector 31 injecting fuel into the combustion chamber 26, a cylinder 22, a piston 24 having a crown and reciprocating in the cylinder 22, the crown being exposed to the combustion chamber 26, and an ignition delay enhancer prolonging an ignition delay of a fuel-air mixture in the combustion chamber 26. A ceramic member 24a is disposed on at least a fuel injection port, to which fuel is injected from the fuel injector 31, of the crown of the piston 24.
Claims19
An internal combustion engine, comprising:
- a combustion chamber;
- a fuel injector injecting fuel into the combustion chamber;
- a cylinder;
- a piston having a crown and reciprocating in the cylinder, the crown being exposed to the combustion chamber;
- and
- an ignition delay enhancer prolonging an ignition delay of a fuel-air mixture in the combustion chamber,
- wherein a ceramic member is disposed on at least a fuel injection port of the crown of the piston, the fuel injector injecting fuel to the fuel injection port,
- the crown of the piston has a cavity defining part of the combustion chamber, the fuel injector injecting fuel to the cavity,
- the ceramic member is disposed on at least a portion of the crown of the piston, the portion facing the cavity, and
- an overhang ratio ranges from 0.57 to 0.96, the overhang ratio being represented by the ratio d1/d2 where d1 is a diameter of a boundary between the ceramic member and any other member on a top surface of the crown of the piston and d2 is a maximum diameter of the boundary between the ceramic member and the other member in a radial direction of the piston.
An internal combustion engine, comprising:
- a combustion chamber;
- a cylinder;
- a piston having a crown and reciprocating in the cylinder, the crown being exposed to the combustion chamber;
- and
- an ignition delay enhancer prolonging an ignition delay of a fuel-air mixture in the combustion chamber,
- wherein a ceramic member is disposed on the crown of the piston.
Dependencies are inferred from the claim text.