Piston Ring

Piston Ring

Piston rings are the majore parts in the piston it provide a dynamic seals for the piston,seal suppresses the leakage of  lubricants from the tribo system and also  provide  protection and cleanliness 3 piston rings are mounted on the piston

Types of rings

In the piston there are two kinds of rings mounted on the piston they are

1.       Oil ring

2.       Compression ring

Compression Ring

Compression ring act as a gas seal between the piston and the cylinder liner wall, preventing combustion gases from trailing down to the crankcase, the ring have certain pre-tension i.e. they have large free diameter than the cylinder liner,which assists the ring in conforming to the liner.

Oil Ring

Some mechanism   needed to distribute the oil evenly onto the liner ,The number of oil control rings in in ring pack is 1 or 2.Normally a single oil control ring is sufficient but on occasions a second ring may be required.The scraped oil is collected in the oil control ring groove and transported through the piston back to crankcase

Material and coating

Grey cast iron is the main material for piston rings and also to provide better  beneficial coating also provided over the ring  chromium coating is used to resist abrasive and corrosive conditions ,Hard chrome plating is particularly for compression Ring.