Mazda Motor Corporation

Katsuya Miyoshi

Ichiro Hirose

An oil ring set has an expander between upper and bottom side rails for a piston of a reciprocal internal combustion engine. The oil ring set has dimensions determined so as to have a thickness satisfying a first relationship between a radial thickness and tension determined from a coefficient for an oil film thickness and a standard parameter representative of a predetermined thickness, a second relationship between a radial thickness and tension determined from a coefficient for an oil ring propensity to follow deformation and its pattern of the cylinder wall and a standard parameter representative of a predetermined amount of oil consumption, and a third relationship between a radial thickness and tension determined based on a coefficient representative of permanence of oil ring springiness against swelling and a standard parameter of the coefficient of springiness permanence.

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Hiroshima-ken, Japan

Katsuya Miyoshi