Oil ring for an internal combustion engine

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:

• an internal face defining a support for the seating of a resilient expander,
• a cylindrical external contact face to be seated against the internal face of the cylinder 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, and
• opposite lateral faces defined by at least one lateral face portion that is designed to reduce the moment of inertia of the annular body toward its axis and center of mass, the lateral face portion extending radially outwardly, angled towards the external contact face,
• wherein the annular body is provided with channels in the form of axial slots radially spaced back in relation to the external contact face and extending into the at least one lateral face portion, providing fluid communication between lateral face portions that are opposite to each other and being opened to the internal face of the annular body.

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
• a conical 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 the lateral face portion extending outwardly and angled towards the external contact face,
• wherein the annular body being provided with channels in the form of axial slots radially spaced back in relation to the external contact face and extending into the at least one lateral face portion, providing fluid communication between lateral face portions that are opposite to each other and being opened to the internal face of the annular body.