Combination of cylinder liner and piston ring of internal combustion engine
AssigneesNippon Piston Ring Co., Ltd., Hino Motors, Ltd.
InventorsYoshiki Ishikawa, Hideyo Iwama, Yoshio Naito, Takashi Takakura, Kousuke Ito, Tatsuya Suzuki
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Abstract
A cylinder liner and a piston ring adapted to be combined therewith in an internal combustion engine are provided that have excellent abrasion resistance, where iron oxide film is formed at least on a part of the inner circumferential surface of the cylinder liner, and metallic nitride film is formed at least on a sliding surface of the piston ring sliding along the cylinder liner.
Claims9
A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,
- said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner,
- said iron oxide film containing Fe3O4 as a major constituent, and wherein the iron oxide film is formed by either molten nitrate treatment or water vapor treatment.
A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,
- said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner,
- said iron oxide film containing Fe3O4 as a major constituent,
- wherein the iron oxide film is formed by either molten nitrate treatment or water vapor treatment, and
- wherein the piston ring contains a metallic nitride film on at least a sliding surface thereof.
A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,
- said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner,
- said iron oxide film containing Fe3O4 as a major constituent,
- wherein the metallic nitride contains oxygen in an amount of 1 to 15 mass %, and carbon in an amount of 1 to 15 mass %, in a solid solution state within the crystal structure of Cr—N, and
- wherein the piston ring contains a metallic nitride film on at least a sliding surface thereof.
A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,
- said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner,
- said iron oxide film containing Fe3O4 as a major constituent wherein the iron oxide film has numerous pores having diameters of approximately 1 μm.
Dependencies are inferred from the claim text.