Oil ring for internal combustion engine
AssigneeRiken
InventorsYunzhi Gao, Junichi Takahashi, Gyo Muramatsu, Ryo Obara, Tetsuji Miyashita, Tadahiko Watanabe
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Abstract
An oil ring for an internal combustion engine is provided that can prevent adhesion and deposition of oil sludge even during long-time operation of the engine, can thereby prevent the occurrence of sticking of the oil ring components to each other, and can maintain a good oil control function. At least part of the surface of the oil ring for an internal combustion engine is coated with a metal coating having a surface free energy of 40 mJ/m2 or less and a hydrogen bonding strength of 1.0 mJ/m2 or less. A coating of Ni, Cu, or an alloy containing Ni or Cu is used as the metal coating.
Claims15
An oil ring for an internal combustion engine in which at least part of a surface of the oil ring is coated with a metal coating, wherein a surface of the metal coating has a surface free energy at 60° C. of 40 mJ/m2 or less and a hydrogen bonding strength at 60° C. of 1.0 mJ/m2 or less.
Dependencies are inferred from the claim text.