US 8,555,850 B2Granted

Two-piece compression piston ring of an internal combustion engine

AssigneeGM Global Technology Operations LLC

InventorsZheng Ma, John B. Fisher, Kenneth E. Schroeder

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Abstract

A compression ring assembly for a piston of an internal combustion engine includes a first compression ring and a second compression ring, with the second compression ring overlaid adjacent to and in abutting engagement with the first compression ring. When both the first compression ring and the second compression ring are uncompressed and in a free state, the second compression ring includes an outer second ring diameter that is greater than an outer first ring diameter of the first compression ring. Additionally, the first compression ring includes a first radial width that is greater than a second radial width of the second compression ring. A first gap of the first compression ring is positioned relative to a second gap of the second compression ring in a non-overlapping orientation.

Claims18

Dependent claims

A piston assembly for an engine of a vehicle, the piston assembly comprising:

an annular body having an outer side surface defining a groove;
and
a ring assembly disposed within the groove, the ring assembly including:
a first compression ring including a first ring outer face defining an outer first ring diameter;
and
a second compression ring overlaid adjacent the first compression ring and including a second ring outer face defining an outer second ring diameter;
wherein the outer second ring diameter is larger than the outer first ring diameter when both the first compression ring and the second compression ring are disposed in a radially uncompressed condition;
and
wherein the first compression ring includes a first ring cut defining a first ring gap extending radially across the first compression ring, and the second compression ring includes a second ring cut defining a second ring gap extending radially across the second compression ring, wherein the second ring gap is larger than the first ring gap when both of the first compression ring and the second compression ring are disposed in the radially uncompressed condition.

6 more elements

A ring assembly for a piston of an internal combustion engine, the ring assembly comprising;

a first compression ring including a first ring outer face defining an outer first ring diameter;
and
a second compression ring overlaid adjacent the first compression ring and including a second ring outer face defining an outer second ring diameter;
wherein both the first compression ring and the second compression ring are configured for disposition within a singular groove defined by an annular body of a piston;
wherein the outer second ring diameter is larger than the outer first ring diameter when both the first compression ring and the second compression ring are disposed in a radially uncompressed condition;
and
wherein the first compression ring includes a first ring cut defining a first ring gap extending radially across the first compression ring, and the second compression ring includes a second ring cut defining a second ring gap extending radially across the second compression ring, wherein the second ring gap is larger than the first ring gap.

4 more elements

Dependencies are inferred from the claim text.