| DEVELOPMENT OF A NEW MEASUREMENT SYSTEM FOR PISTON
RING FRICTION BASED ON THE FLOATING LINER METHOD |
| Hyunjung Oh 1, Kyoung-Pyo Ha 2, Kyoungdoug Min 1 |
1Seoul National University
2Hyundai America Technical Center Inc. |
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| ABSTRACT |
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A new friction measurement system was developed to investigate piston ring friction in detail based on the
floating liner method. Unlike the conventional floating liner experiments, an extended piston was adopted for the conventional
crank-piston system to minimize friction from a piston lateral motion. The interaction between piston skirt and liner caused by
piston thrust force can be excluded with the new measurement system. Therefore, a parametric study for the only piston ring
friction can be possible. In this study, the experiments were conducted under both motoring and firing conditions. The oil
temperature was changed to observe the effect of the oil viscosity on the piston ring friction. The friction data showed good
agreement with the Stribeck curve for the engine speed, in-cylinder pressure, and oil temperature changes. |
| Key Words:
Piston ring friction, Floating liner, Double pistons, Piston thrust force |
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Corresponding Author.
Kyoungdoug Min , Email. 
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