The piston ring-pack exhibits a complex dynamic behaviour, which includes the dynamics of the rings and related gas and oil flows. These dynamic phenomena play a crucial role in the piston assembly response such as blow-by, friction, wear and oil consumption and it is of both theoretical and practical interest to understand and model them. In fact, a significant share of the total power loss in a modern automotive engine is due to the ring pack/cylinder wall friction. On this basis, the lubrication of the piston ring has been an important research matter for many years, because it is generally accepted that the interaction at the ring-cylinder wall interface provides substantial effects on friction, wear, oil consumption and power loss in internal combustion engines. This paper proposes a literature review of the main physical phenomena considered by previous studies focusing on the modelling and the numerical simulation of frictional behaviour of piston rings, in the first section. In the second section the more recent technical papers and patents about piston ring pack are briefly discussed. They deal on novel materials, innovative manufacturing methods and modified shape for improving frictional, stability and blow-by behaviours.
ENGINE PISTON RINGS IMPROVEMENT THROUGH EFFECTIVE MATERIALS, ADVANCED MANUFACTURING METHODS AND NOVEL DESIGN SHAPE
SENATORE, ADOLFO;
2014-01-01
Abstract
The piston ring-pack exhibits a complex dynamic behaviour, which includes the dynamics of the rings and related gas and oil flows. These dynamic phenomena play a crucial role in the piston assembly response such as blow-by, friction, wear and oil consumption and it is of both theoretical and practical interest to understand and model them. In fact, a significant share of the total power loss in a modern automotive engine is due to the ring pack/cylinder wall friction. On this basis, the lubrication of the piston ring has been an important research matter for many years, because it is generally accepted that the interaction at the ring-cylinder wall interface provides substantial effects on friction, wear, oil consumption and power loss in internal combustion engines. This paper proposes a literature review of the main physical phenomena considered by previous studies focusing on the modelling and the numerical simulation of frictional behaviour of piston rings, in the first section. In the second section the more recent technical papers and patents about piston ring pack are briefly discussed. They deal on novel materials, innovative manufacturing methods and modified shape for improving frictional, stability and blow-by behaviours.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
