The invention relates to a cylinder bore and a method. The cylinder bore is configured to receive a piston for reciprocating movement therein and has a pressure side and a counter-pressure side. The cylinder bore includes a bore surface having a first roughness value in a first longitudinal region on the pressure side and a second roughness value different from the first roughness value in the first longitudinal region on the counter-pressure side.

The invention relates to a cylinder bore and a method. The cylinder bore is configured to receive a piston for reciprocating movement therein and has a pressure side and a counter-pressure side. The cylinder bore includes a bore surface having a first roughness value in a first longitudinal region on the pressure side and a second roughness value different from the first roughness value in the first longitudinal region on the counter-pressure side.

In a cylinder lubrication system for a two-stroke engine, a plurality of lubricating oil supply openings (78) open out in the inner circumferential surface of the cylinder (42) at a point lower than a top ring (22b) of a piston (22) located at a bottom dead center. The lubricating oil supply openings are configured to provide a larger amount of lubricating oil in the thrust side and anti-thrust side of the cylinder than in a remaining part of the cylinder. Thereby, the consumption of lubricating oil and the emission of undesired substances can be minimized while providing an optimum lubrication of the sliding part between the piston and the cylinder.

A sliding assembly for utilization in an internal combustion engine may include at least one piston ring and a cylinder head provided with a through cavity defining an internal surface. The internal surface may define a TDC portion in a proximity of a top dead center, a central portion, and a BDC portion in a proximity of bottom dead center. The TDC portion, central portion, and BDC portion may present surface finishes having a first roughness, a second roughness, and a third roughness, respectively, each defined by a structure of recesses and projections, at least one of which may be substantially uniform. The second roughness may be less than the first roughness value. The piston ring may present at least part of a contact surface upon which a ceramic coating may be applied by a physical vapor deposition.

A sliding assembly for utilization in an internal combustion engine may include at least one piston ring and a cylinder head provided with a through cavity defining an internal surface. The internal surface may define a TDC portion in a proximity of a top dead center, a central portion, and a BDC portion in a proximity of bottom dead center. The TDC portion, central portion, and BDC portion may present surface finishes having a first roughness, a second roughness, and a third roughness, respectively, each defined by a structure of recesses and projections, at least one of which may be substantially uniform. The second roughness may be less than the first roughness value. The piston ring may present at least part of a contact surface upon which a ceramic coating may be applied by a physical vapor deposition.

An engine may include a cylinder bore configured to have a combustion chamber formed by setting a top section in which a top dead center is formed, a bottom section in which a bottom dead center is formed, and a middle section H formed between the top section and the bottom section and reduce a shearing resistance by a texturing pattern formed in the middle section H.

An engine may include a cylinder bore configured to have a combustion chamber formed by setting a top section in which a top dead center is formed, a bottom section in which a bottom dead center is formed, and a middle section H formed between the top section and the bottom section and reduce a shearing resistance by a texturing pattern formed in the middle section H.

A carbon scraper, a method of manufacturing a system with a carbon scraper, and method of scraping carbon from a piston of an internal combustion engine are provided. The carbon escaper includes an outer annular metallic shell portion having an annular recess therein. The annular scraper also includes an inlaid thermal barrier coating portion positioned within the annular recess of the outer annular metallic shell portion such that the inlaid thermal barrier coating portion is concentric with an outer annular metallic shell portion.

A lubrication structure of an internal combustion engine is provided according to the present application and configured to lubricate a large particle between components of each of friction pairs of the internal combustion engine. The lubrication structure includes several microstructural bodies being capable of entering into a clearance between the components of each of the friction pairs. Under the action of the microstructural bodies, a plastic deformation of surfaces of each of the friction pairs caused by the large particle can be avoided, thereby, wear of components of the internal combustion engine is decreased, the service life of the internal combustion engine is increased, a load and fuel consumption of the internal combustion engine are decreased, and pollution of the internal combustion engine is reduced.

A cylinder block assembly for a V-engine is provided. In one example, the cylinder block assembly includes a cylinder block including a plurality of cylinders divided into a first cylinder bank and a second cylinder bank, a valley positioned between the first and second cylinder banks, and a plurality of crankshaft supports. The cylinder block assembly further includes a structural frame including an interior surface coupled to the plurality of crankshaft supports and two top surfaces arranged above the interior surface and on opposing sides of the assembly, where each top surface is coupled to the cylinder block above a top of the plurality of crankshaft supports.