Sylinteripinnat

Sylinteripinnat refers to the inner surfaces of a cylinder bore in an internal combustion engine and similar piston-cylinder assemblies. These surfaces form the sliding contact with piston rings and must support lubrication, seal compression, and resist wear. They are critical for engine efficiency, oil control, and overall durability.

In construction, cylinder bores can be machined directly into the engine block or implemented as sleeves or liners. Common materials include cast iron or steel liners, with aluminum engine blocks often employing bore liners or hard coatings to improve wear resistance. Surface finishing typically involves boring and honing to produce a controlled micro-geometry. A cross-hatch pattern is commonly introduced during honing to promote oil retention and seat piston rings properly. Modern finishes aim for a plateau-like surface that maintains oil film while reducing friction.

Surface quality is specified using metrology parameters such as roughness (Ra, Rz) and geometric tolerances (taper, out-of-roundness). The bore quality affects sealing, ring seating, and wear behavior, and is routinely checked during production and service life. Wear mechanisms include scuffing, scoring, glazing, and bore deformation under load. Proper lubrication, bore condition, and ring material compatibility are essential to minimize these issues.

Applications of sylinteripinnat are primarily in automotive, marine, and stationary engines where reliable piston-ring sealing and low oil consumption are required. Ongoing developments focus on advanced coatings, refined honing techniques, and measurement methods to optimize durability and performance.