Patent ID: 7252292

Claim:
An oil ring for an internal combustion engine, comprising a metallic annular body to be mounted around a piston reciprocating inside a cylinder of the engine, said annular body having: opposite lateral faces, an internal face defining a support for the seating of a resilient expander, and an external contact face to be seated against the internal face of the cylinder, wherein the external contact face is defined by a single continuous surface extension of the annular body presenting, in the axial direction, a height that is substantially smaller than the height of the internal face, wherein each lateral face being defined by at least one lateral face portion that is designed to reduce the moment of inertia of the annular body towards its axis and center of mass, wherein the annular body being provided with channels in the form of axial slots radially spaced back in relation to the external contact face, providing fluid communication between lateral face portions that are opposite to each other and being opened to the internal face of the annular body the channels having a contour with the approximate shape of a rounded and opened “V”, with the external ends of its lateral walls matching with adjacent convex portions of the internal face of the annular body, giving to the latter a sinusoidal internal contour.