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 includes 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. A ceramic member is disposed on at least a fuel injection port, to which fuel is injected from the fuel injector, of the crown of the piston.
Claims15
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 the crown of the piston includes a ceramic member and an aluminum alloy base, the ceramic member is disposed on a position to which at least fuel is injected from the fuel injector, and the aluminum alloy base is disposed on a position to which fuel is not injected from the fuel injector,
- 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 that defines a boundary between the ceramic member and the aluminum alloy base ranges from 0.57 to 0.96, the overhang ratio being represented by the ratio d1/d2 where d1 is a diameter of the boundary between the ceramic member and the aluminum alloy base 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 aluminum alloy base 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 and a ceramic member is disposed on at least a part of a cylinder liner,
- the ceramic member on the cylinder liner and the ceramic member on the crown of the piston comprise different materials, and
- the ceramic member on the cylinder liner comprises a porous material having interconnected pores.
Dependencies are inferred from the claim text.