Member for internal combustion engine and production method thereof
AssigneeNissan Motor Co., Ltd.
InventorsSeiji Kamada, Hiroshi Kumagai, Midori Kondou, Kenji Kikuchi, Takumaru Sagawa, Yutaka Mabuchi, Takahiro Nakahigashi
Life of this patent
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Abstract
A member for an internal combustion engine, such as a piston, a valve and a fuel injection valve. The member includes a substrate. A carbon-based coating film is formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable. The carbon-based coating film contains fluorine and has a thickness of 10 μm or less.
Claims17
A member for an internal combustion engine, comprising:
- a substrate;
- and
- a carbon-based coating film formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable, the carbon-based coating film containing fluorine and having a thickness of 10 μm or less,
- wherein the carbon-based coating film has a fluorine and carbon content of (fluorine/carbon) ≧0.25 in atomic number ratio.
A piston for an internal combustion engine, comprising:
- a substrate, wherein the substrate is a piston body;
- and
- a carbon-based coating film formed on the piston body to cover at least a part of a region of the piston body to which region fuel for the internal combustion engine is contactable, the carbon-based coating film containing fluorine and having a thickness of 10 μm or less,
- wherein the carbon-based coating film has a fluorine and carbon content of (fluorine/carbon) ≧0.25 in atomic number ratio,
- wherein at least a crown surface of the piston body is coated with the carbon-based coating film.
A valve for an internal combustion engine, comprising:
- a substrate, wherein the substrate is a valve body;
- and
- a carbon-based coating film formed on the valve body to cover at least a part of a region of the valve body to which region fuel for the internal combustion engine is contactable, the carbon-based coating film containing fluorine and having a thickness of 10 μm or less,
- wherein the carbon-based coating film has a fluorine and carbon content of (fluorine/carbon) ≧0.25 in atomic number ratio.
- wherein at least a part selected from the group consisting of a valve stem, a valve head and a surface portion at a side of a combustion chamber is coated with the carbon-based coating film.
A fuel injection valve for an internal combustion engine, comprising:
- a substrate, wherein the substrate is a fuel injection valve body;
- and
- a carbon-based coating film formed on the fuel injection valve body to cover at least a part of a region of the fuel injection valve body to which region fuel for the internal combustion engine is contactable, the carbon-based coating film containing fluorine and having a thickness of 10 μm or less,
- wherein the carbon-based coating film has a fluorine and carbon content of (fluorine/carbon) ≧0.25 in atomic number ratio,
- wherein at least an inner surface of the injection valve body, defining an injection hole, is coated with the carbon-based coating film.
A method of producing a member for an internal combustion engine, the member including a substrate;
- and a carbon-based coating film formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable, the carbon-based coating film containing fluorine and having a thickness of 10 μm or less, the method comprising:
- forming the carbon-based coating film on the substrate by a vapor phase deposition process,
- wherein the carbon-based coating film has a fluorine and carbon content of (fluorine/carbon) ≧0.25 in atomic number ratio.
Dependencies are inferred from the claim text.