The integral - structured piston ring is made by casting or integral - forming processes. The combined ring is composed of two or more parts assembled in one ring groove. The slotted oil ring has parallel sides, two contact ring lands, and oil return holes. The slotted spiral - spring - loaded oil ring has a spiral spring placed inside the slotted oil ring. The steel - strip combined oil ring is composed of a liner ring and two scraping rings. The piston ring has a sealing function, preventing the gas in the combustion chamber from leaking into the crankcase and improving thermal efficiency. It can regulate engine oil, scrape off the excess lubricating oil on the cylinder wall and ensure a thin oil film on the cylinder wall for normal lubrication. It can also conduct the heat of the piston to the cylinder liner through the piston ring, playing a cooling role. At the same time, it keeps the piston in the cylinder, preventing direct contact between the piston and the cylinder wall, ensuring smooth piston movement, reducing friction resistance, and preventing piston knock. The support ring, also known as the guide ring, is mainly used to support the movement of the piston or piston rod, preventing direct contact and friction with the cylinder body during movement, protecting the cylinder body, piston, or piston rod from damage. It can also guide the piston to move in a straight line, prevent the piston from deviating due to uneven force, reduce internal leakage, and extend the service life of the sealing parts. Commonly used materials include phenolic fabric - reinforced plastics, polyoxymethylene (POM), polytetrafluoroethylene (PTFE), etc. These materials have good wear resistance, antifriction properties, and certain strength, which can meet the usage requirements of the support ring. It is widely used in equipment such as hydraulic cylinders and cylinders. For example, in reciprocating compressors, compressors other than vertical labyrinth pistons must have support rings to support the weight of the piston and half of the piston rod.
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