Fundamentals of lubrication and friction of piston ring contact

Abstracts: The piston ring-pack exhibits a complex dynamic behaviour, which includes gas and oil flows, twisting motion of each ring and its influence on ring-liner and ring-groove lubrication and contact, as well as unsteady oil supply. In modern automotive engines, the dynamics result in a significant share of the total friction power loss and plays a crucial role in the piston assembly response in terms of blowby, wear and oil consumption. This chapter illustrates the physics of piston ring lubrication and friction, the main mathematical and computer models and the fundamentals of the ring-pack role. The chapter is completed by future trends and opportunities of research into piston ring modelling and improvements to the frictional behaviour.

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