A seal assembly that includes a substantially annular cylindrical configuration that defines an aperture that defines a cylindrical axis and a radial direction is provided. The seal assembly comprises a spring member that includes two arm portions that extend substantially in a direction that is parallel to the cylindrical axis and that meet forming a flex point, and a sealing member that at least partially encapsulates the spring member and that includes: a first sealing feature, and a second sealing feature that is positioned axially and radially adjacent the flex point of the spring member and that faces in a direction that is diametrically opposite the direction that the first sealing feature faces along the radial direction, and an elastomeric material that includes a base resistant type 5 fluoroleastomer made from a copolymer of propylene and tetrafluoroethylene.

An anti-polishing ring includes a ring body defining an axis of revolution, and a radial direction that is perpendicular to the axis of revolution, and a circumferential direction about the axis of revolution. The ring body includes an outer circumferential surface, a bottom surface, a top surface, and an inner circumferential surface. The inner circumferential surface defines an inner diameter, the ring body defines a radial thickness measured from the inner circumferential surface to the outer circumferential surface, and a ratio of the radial thickness to the inner diameter ranges from 0.015 to 0.020.

An anti-polishing ring includes a ring body defining an axis of revolution, and a radial direction that is perpendicular to the axis of revolution, and a circumferential direction about the axis of revolution. The ring body includes an outer circumferential surface, a bottom surface, a top surface, and an inner circumferential surface. The inner circumferential surface defines an inner diameter, the ring body defines a radial thickness measured from the inner circumferential surface to the outer circumferential surface, and a ratio of the radial thickness to the inner diameter ranges from 0.015 to 0.020.

Unique apparatuses and methods for scraping deposits from a piston as the piston moves in an upstroke direction and a downstroke direction. An engine assembly includes a cylinder having a cylinder bore, a piston having a crown end, wherein the piston is disposed in the cylinder bore and configured to move in an upstroke direction and a downstroke direction relative to the cylinder bore. The piston includes a first land positioned adjacent the crown end. An antipolishing ring is disposed within the cylinder bore. The antipolishing ring has an outer annular surface and an inner annular surface, the inner annular surface has one or more protrusions configured to scrape the first land when the piston moves in the upstroke direction and the downstroke direction. The protrusions are also configured to scrape the first land when the piston has secondary or lateral motion.

Unique apparatuses and methods for scraping deposits from a piston as the piston moves in an upstroke direction and a downstroke direction. An engine assembly includes a cylinder having a cylinder bore, a piston having a crown end, wherein the piston is disposed in the cylinder bore and configured to move in an upstroke direction and a downstroke direction relative to the cylinder bore. The piston includes a first land positioned adjacent the crown end. An antipolishing ring is disposed within the cylinder bore. The antipolishing ring has an outer annular surface and an inner annular surface, the inner annular surface has one or more protrusions configured to scrape the first land when the piston moves in the upstroke direction and the downstroke direction. The protrusions are also configured to scrape the first land when the piston has secondary or lateral motion.

In a method for coating a sliding element, in particular a piston ring or a cylinder liner of an internal combustion engine, DLC phases are embedded into a hard material layer as said hard material layer is deposited. A sliding element, such as a piston ring or a cylinder liner of an internal combustion engine, comprises a hard material layer with embedded DLC phases.

In a method for coating a sliding element, in particular a piston ring or a cylinder liner of an internal combustion engine, DLC phases are embedded into a hard material layer as said hard material layer is deposited. A sliding element, such as a piston ring or a cylinder liner of an internal combustion engine, comprises a hard material layer with embedded DLC phases.

There is provided a cylinder device having optimal arrangement of fine textures and optimal surface roughness capable of reducing wear of a cylinder bore side and a piston ring by processing fine textures in an optimal selection region of the cylinder bore side to improve lubrication characteristics between the piston ring and the cylinder bore side while reducing engine oil consumption by processing surface roughness of the cylinder bore side to an optimal status.

There is provided a cylinder device having optimal arrangement of fine textures and optimal surface roughness capable of reducing wear of a cylinder bore side and a piston ring by processing fine textures in an optimal selection region of the cylinder bore side to improve lubrication characteristics between the piston ring and the cylinder bore side while reducing engine oil consumption by processing surface roughness of the cylinder bore side to an optimal status.

A piston of a cylinder of an internal combustion engine includes: an upper piston crown; a radially outer surface; a plurality grooves arranged on the radially outer surface; and a plurality of piston rings each positioned in a respective one of the grooves. The radially outer surface forms a top land arranged between the upper piston crown and an uppermost one of the grooves of the piston, and the top land has an axial length and a non-abrasion-proof coating.