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Piston Ring (174)

A piston ring is a split ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine.

The three main functions of piston rings in reciprocating engines are :

Sealing the combustion/expansion chamber.
Supporting heat transfer from the piston to the cylinder wall.
Regulating engine oil consumption.
The gap in the piston ring compresses to a few thousandths of an inch when inside the cylinder bore.

Most automotive pistons have three rings: compression rings; oil control rings

Oil control rings typically are of three types:
Single piece cast iron.
Helical spring backed cast iron or steel.
Multipiece steel.

Piston rings are subject to wear as they move up and down the cylinder bore due to their own inherent load and due to the gas load acting on the ring. To minimize this, they are made of wear-resistant materials, such as cast iron and steel, and are coated or treated to enhance the wear resistance. Most modern diesel engines have top rings coated with a modified chromium coating known as CKS or GDC,a patent coating from Goetze which has aluminium oxide or diamond particles respectively included in the chrome surface.

World famous brand: GOETZ®ï¼ŒTPR®ï¼ŒDEVES®.