Oil-control ring of piston

Abstract

Provided is an oil-control ring mounted around a ring-groove of a piston of a gasoline engine. The oil-control ring comprises an upper first thin ring having a gap, an upper second thin ring having a gap, a lower first thin ring having a gap, a lower second thin ring having a gap, and an intermediate main ring, wherein the gap of the upper first thin ring is not aligned with the gap of the upper second thin ring and the gap of the lower first thin ring is not aligned with the gap of the lower second thin ring. A plurality of embodiments of the main ring are made possible.

Dependencies are inferred from the claim text.