Piston ring and cylinder liner combination
AssigneeTeikoku Piston Ring Co., Ltd.
InventorToshiaki Imai
Life of this patent
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Abstract
An outer circumferential surface of a piston ring is covered with a physical vapor deposition film, chemical vapor deposition film or composite chromium plating film. The physical vapor deposition film or chemical vapor deposition film consists of chromium or titanium nitrides (for instance CrN, Cr.sub.2 N, a mixture of Cr and Cr.sub.2 N, TiN) or carbides (for instance CrC, TiC). The composite chromium plating film contains carbides (for instance SiC) or nitrides (for instance Si.sub.3 N.sub.4) or oxides (for instance Al.sub.2 O.sub.3) in cracks in the film. A cylinder liner is made of spheroidal graphite cast iron.
Claims6
A piston ring and cylinder liner combination for internal combustion engines, wherein said cylinder liner is made of spheroidal graphite cast iron and said piston ring is formed on its outer circumferential surface with a physical vapor deposition film, chemical vapor deposition film or composite chromium plating film, and the spheroidal graphite cast iron is exposed on the inner circumferential surface of said cylinder liner which contacts said piston ring.
Dependencies are inferred from the claim text.