TECHNICAL PAPERS: Internal Combustion Engines

Modeling the Lubrication, Dynamics, and Effects of Piston Dynamic Tilt of Twin-Land Oil Control Rings in Internal Combustion Engines

[+] Author and Article Information
T. Tian, V. W. Wong

Sloan Automotive Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 31-166, Cambridge, MA 021392

J. Eng. Gas Turbines Power 122(1), 119-129 (Mar 18, 1999) (11 pages) doi:10.1115/1.483183 History: Received October 22, 1998; Revised March 18, 1999
Copyright © 2000 by ASME
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Twin land oil control ring (TLOCR)
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References and variable definitions for the dynamics of the TLOCR
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Assumptions on the position of the TLOCR in a tilted piston
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Asperity contact between the flanks of the TLOCR and the groove
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Pressure in the oil between the flanks of the TLOCR and the groove
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Lubrication between the lands and the liner
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Relation between the clearances of the two lands
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Definition of the running surface profiles used in this work
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Minimum oil film thickness of the two lands and piston dynamic tilt
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Integrated radial forces on two lands and all the different relative angles
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Lubrication conditions of two lands
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Oil film thickness left by the two lands during down-strokes
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Integrated friction force of the TLOCR from five locations under two different friction coefficients
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Axial position of the TLOCR inside the groove and the driving forces
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Axial forces and moments generated from TLOCR/groove interactions
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Motion of the TLOCR under two different assumed oil film thickness on the flanks of the groove
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Integrated axial forces from TLOCR/groove asperity contact under thin oil film thickness
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Maximum of the MOFT of the two lands under different torsional stiffness and ring tensions



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