System and method having an anti-polishing ring for a piston
A system includes a cylinder liner assembly configured to line a cylinder around a tight top land piston. The cylinder liner assembly includes a cylinder liner having an inner liner surface extending circumferentially about a central axis and an anti-polishing ring.
1 . A system, comprising:
a cylinder liner assembly configured to line a cylinder around a piston, wherein the cylinder liner assembly comprises:
a cylinder liner comprising an inner liner surface extending circumferentially about a central axis; and
an anti-polishing ring coupled to the cylinder liner, wherein the anti-polishing ring comprises a tapered inner surface extending circumferentially about the central axis;
wherein a radial distance spanning from an outer radial surface of a top land of the piston at a top end of the top land to the anti-polishing ring is less than 0.34% of a bore diameter of the cylinder;
wherein a first axial height spanning from a bottom surface of the anti-polishing ring to a top end of the tapered inner surface is greater than half of a second axial height spanning from a top surface of a top ring groove of the piston to an additional top surface of the piston.
2 . The system of claim 1 , wherein the anti-polishing ring comprises:
a top portion extending circumferentially about the central axis; and
a tapered portion extending from the top portion in a downstroke direction of the piston, and the tapered portion comprises the tapered inner surface extending circumferentially about the central axis.
3 . The system of claim 2 , wherein the tapered inner surface is configured to protrude radially inward from the inner liner surface, and a protrusion distance of the tapered inner surface spanning from the inner liner surface to the tapered inner surface decreases along the downstroke direction of the piston.
4 . The system of claim 3 , wherein the top portion is configured to encompass a radial perimeter of the top land of the piston in a top dead center (TDC) position of the piston.
5 . The system of claim 3 , wherein the protrusion distance of the tapered inner surface varies circumferentially about the central axis based on an irregular pattern, wherein the protrusion distance varies unevenly by alternating in opposite directions with an irregular amplitude peak to peak.
6 . The system of claim 3 , wherein the tapered inner surface comprises an inner radius that varies over a range from a first radius to a second radius, a top ring of the piston has an outer radius that is between the first and second radii of the range.
7 . The system of claim 6 , wherein the top ring traverses over the tapered inner surface when the piston is at a top dead center (TDC) position.
8 . The system of claim 3 , wherein the inner liner surface is substantially annular, the top portion is substantially annular, the tapered inner surface is substantially annular, wherein the first axial height is greater than half of a third axial height spanning from the bottom surface of the anti-polishing ring to a top surface of the cylinder liner.
9 . The system of claim 3 , wherein the cylinder liner and the anti-polishing ring form a single continuous piece.
10 . The system of claim 3 , wherein the anti-polishing ring is coupled to the cylinder liner via one or more fasteners, wherein the one or more fasteners block a circumferential rotation of the anti-polishing ring relative to the cylinder liner.
11 . The system of claim 10 , wherein the anti-polishing ring is configured to separate from the cylinder liner, wherein a separation of the anti-polishing ring and the cylinder liner is configured to enable a removal of the piston from the cylinder liner.
12 . The system of claim 3 , comprising the piston, wherein the cylinder is disposed about the piston.
13 . The system of claim 3 , wherein a ratio between a maximum protrusion distance spanning from the liner inner surface to the tapered inner surface, and an axial length of the anti-polishing ring is between 1:400 and 1:200.
14 . The system of claim 3 , wherein the top portion comprises a top inner surface extending circumferentially about the central axis, wherein the top inner surface has a constant radius relative to the central axis in an axial direction along the central axis.
15 . A system, comprising:
a piston comprising a top land;
a cylinder liner disposed about the piston and configured to line a cylinder, wherein the cylinder liner comprises an inner liner surface extending circumferentially about a central axis of the piston; and
an anti-polishing ring coupled to the cylinder liner, wherein the anti-polishing ring comprises a tapered portion, and the tapered portion is configured to overlap the top land when the piston is disposed in a top dead center position;
wherein a radial distance spanning from an outer radial surface of the top land at a top end of the top land to the anti-polishing ring is less than 0.34% of a bore diameter of the cylinder;
wherein a first axial height spanning from a bottom surface of the anti-polishing ring to a top end of the tapered inner surface is greater than half of a second axial height spanning from a top surface of a top ring groove of the piston to an additional top surface of the piston.
16 . The system of claim 15 , wherein the anti-polishing ring comprises:
a top portion extending circumferentially about the central axis; and
the tapered portion extending from the top portion in a downstroke direction of the piston, the tapered portion comprises the tapered inner surface, and the tapered inner surface extends circumferentially about the central axis.
17 . The system of claim 16 , wherein the tapered inner surface is configured to protrude radially inward from the inner liner surface, and a protrusion distance of the tapered inner surface spanning from the inner liner surface to the tapered inner surface decreases along the downstroke direction of the piston.
18 . The system of claim 17 , wherein a ratio between a maximum protrusion distance spanning from the inner liner surface to the tapered inner surface, and a radius of the piston is between 1:4,750 and 1:2,700.
19 . The system of claim 17 , wherein the protrusion distance of the tapered inner surface varies circumferentially about the central axis based on an irregular pattern, wherein the protrusion distance varies unevenly by alternating in opposite directions with an irregular amplitude peak to peak.
20 . A method, comprising:
providing a cylinder liner comprising an inner liner surface extending circumferentially about a central axis; and
providing an anti-polishing ring, wherein the cylinder liner and the anti-polishing ring are portions of a cylinder liner assembly configured to line a cylinder around a piston, wherein the anti-polishing ring comprises a tapered inner surface extending circumferentially about the central axis, wherein a radial distance spanning from an outer radial surface of a top land of the piston at a top end of the top land to the anti-polishing ring is less than 0.34% of a bore diameter of the cylinder, wherein a first axial height spanning from a bottom surface of the anti-polishing ring to a top end of the tapered inner surface is greater than half of a second axial height spanning from a top surface of a top ring groove of the piston to an additional top surface of the piston.