Piston Ring

Definition - What does Piston Ring mean?

A Piston Ring is the split ring that is installed in the grooves on the outer diameter of the piston of any reciprocating engine such as internal combustion engine or steam engine. Piston rings have three main purposes:

  • They seal the combustion chamber of an engine and do not allow transfer of combustion gases to the crank.
  • Help in effective transfer of heat from the piston to the cylinder walls.
  • Help in regulating engine oil consumption.

Petropedia explains Piston Ring

Piston rings are one of the important parts of the engine. There are two types of piston rings used in engines. They are:

  • Compression Ring
    • Top Compression Ring – This ring is known as upper compression ring and is designed to be operated under higher temperature and when the load on the engine is high.
    • Second Compression Ring – This ring is known as lower compression ring. It works along with the top compression ring and seals the combustion chamber. It also allows the effective heat transfer between the piston and cylinder walls. These rings are also called as scrapper compression rings.
  • Oil Control Rings – These rings are used to control the oil consumption. They help in removing excessive lubrication oil from the cylinder walls and return it to the crank case. They also ensure a covering of thin oil lubrication film on the piston and cylinder walls.
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