Browse Publications Technical Papers 2004-01-2911
2004-10-25

Effects of Piston Design Parameters on Piston Secondary Motion and Skirt-Liner Friction 2004-01-2911

In this paper, a previously developed and experimentally-validated piston secondary motion model has been improved further numerically and applied to understand the detailed interactions between the piston skirt and cylinder liner for various piston design parameters. The model considers the roughness of the surfaces and the topography of the skirt in both the axial (barrel profile) and circumferential directions (ovality). Three modes of lubrication: hydrodynamic, mixed, and boundary lubrication regimes have been considered and the skirt is partially flooded in most cases. Elastic deformation of the skirt is an essential part of the model. In this model, the piston dynamic behavior, frictional and impact forces are predicted as functions of crank angle and are examined in detail. Parameters investigated include piston skirt profile, piston to liner clearance, surface roughness, and oil availability. The results show that some of these parameters have profound effects on the frictional and impact forces at the piston-skirt/liner interface and therefore they have the potential to optimize the piston friction power loss. Correlations and non-dimensional scaling laws are developed to illustrate the basic governing phenomena. These results aim at providing a set of quantitative design guidelines.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X