Fluorine rubber U sealing ring for piston

描述

Piston sealing ring,fluororubber u sealing ring..Piston rings are critical sealing components within an engine, characterised primarily by their wear resistance, thermal conductivity, and elasticity. Their functions encompass sealing the combustion chamber, regulating engine oil, conducting and dissipating heat, and supporting the piston.
Sealing Function
By closely conforming to the cylinder wall, they prevent combustion chamber gases from leaking into the crankcase, thereby reducing power loss and oil degradation. The compression rings (typically 2-3 in number) undertake the primary sealing task, while the oil ring assists by scraping away excess oil. ‌
Oil Control
The oil ring scrapes excess oil from the cylinder wall, forming a thin lubricating film between the piston and cylinder wall while preventing oil ingress into the combustion chamber. Modern high-speed engines increasingly rely on this oil control capability. ‌
Thermal Conductivity
Conducts 70%-80% (non-cooled pistons) or 30%-40% (cooled pistons) of heat from the piston crown to the cylinder wall, preventing overheating. ‌
Support and Guidance
Ensures smooth piston movement within the cylinder, minimising friction resistance and preventing knocking. ‌
Materials and Construction
Commonly manufactured from grey cast iron, ductile iron, or steel strip. The primary compression ring is typically chrome-plated or molybdenum-sprayed to enhance wear resistance. Compression rings are predominantly rectangular, twisted, or conical in shape, while oil rings come in standard or composite configurations. ‌