Friction reduction always attracted attention, and improvement has been continued while it was said that the automotive piston ring relatively had a big frictional force in the part which constituted an engine, and fuel efficiency regulation continued being strengthened. Generally, the lubrication state that frictional force is the smallest is Hydrodynamic lubrication, and naturally it is similar for the low friction of the piston ring. However, as for the main reason, the recent piston ring tends to avoid the formation of the hydrodynamic lubrication oil film thickness to a contact face from consideration to oil consumption. We think that such a status is off the basic theory of the piston ring greatly. This document reports, returning to the origin once again, that the principle the function of the piston ring expresses and the difference of performance on the piston ring in recent years.
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