Piston rings are an important element of piston cylinders tibology systems. They fulfil manifold and important tasks:

• gas seal of the combustion chamber
• regulation of the oil film at the cylinder surface
• heat removal from the piston to the cylinder
• minimisation of wear and tear of piston, cylinder and piston rings

In the process of continuous development of the combustion engine the thermic and mechanical stress on the parts grow while the dimensions shrink. The resulting demanding requirements have to be met with innovative technologies.

The development led from simple cast iron rings via steel rings on to coatings which reduce wear and tear.