A Simplified Friction Model of the Piston Ring Assembly

1999-01-0974

03/01/1999

Event
International Congress & Exposition
Authors Abstract
Content
This paper presents a simplified piston ring assembly (PRA) friction model accounting for the piston ring pack and the piston skirt. The ring model considers both mixed and hydrodynamic lubrication; the skirt model considers hydrodynamic lubrication only. The Reynold's equation is used as a governing equation for the hydrodynamic regimes of both models. Simplified assumptions are used for the mixed lubrication in the ring model. The ring model generates unique Stribeck curves for a given ring's geometry; the skirt model generates generic relationships between the friction force and skirt geometry, piston speed, oil viscosity, and assumed boundary conditions. Ring starvation effects are introduced by varying the boundary conditions, as appropriate. The results of the models are compared to measurements made on a motored and fired single cylinder diesel engine; the theoretical calculations provide a reasonable estimate of the measured data.
Meta TagsDetails
DOI
https://doi.org/10.4271/1999-01-0974
Pages
18
Citation
Stanley, R., Taraza, D., Henein, N., and Bryzik, W., "A Simplified Friction Model of the Piston Ring Assembly," SAE Technical Paper 1999-01-0974, 1999, https://doi.org/10.4271/1999-01-0974.
Additional Details
Publisher
Published
Mar 1, 1999
Product Code
1999-01-0974
Content Type
Technical Paper
Language
English