Analytical solution for textured piston ring – Cylinder liner contacts (1D analysis)

• Analytical solutions for textured IVR contacts.
• Geometrical starvation Transition from almost flat rings to small radius of curvature.

The contact between a textured cylinder liner and a piston ring is studied. A simplified analytical 1D model of the pressure distribution and the load carrying capacity is proposed. Two main cases are distinguished: a ring with a small radius of curvature where the texture has a detrimental effect on the load carrying capacity, and a ring with a large radius of curvature where the texture generates a significant additional load carrying capacity.Starved smooth contacts and groove pressure perturbations are modelled. Deep, wide and dense grooves have a detrimental effect on the load carrying capacity for rings with a small radius of curvature; whereas a phenomenon of ‘optimal’ groove to enhance the load carrying capacity appears for a large radius of curvature. The amplitude of the pressure perturbation is a function of the groove location, the groove depth and width. The groove shape (triangular/sinusoidal) plays only a secondary role.