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TECHNICAL PAPERS: Power

Challenges Involved in Piston Top Ring Designs for Modern SI Engines

[+] Author and Article Information
R. Rabuté

Perfect Circle Division, Dana Corporation, Poissy, Francee-mail: remi.rabute@dana.com

T. Tian

Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139e-mail: tian.tian@mit.edu

J. Eng. Gas Turbines Power 123(2), 448-459 (Dec 06, 2000) (12 pages) doi:10.1115/1.1364520 History: Received June 16, 2000; Revised December 06, 2000
Copyright © 2001 by ASME
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References

Figures

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Maximum ring inertia force due to piston acceleration, normalized by the area of ring flank
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Bore expansion under WOT
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Top land crevice volume
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Engine blow-by map with the original design
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Oil consumption with the original design
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Influence of engine load on top ring lift at 6000 rpm
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Calculated land pressures under 6000 rpm/WOT
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Land pressures under 6000 rpm/no-load
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Instantaneous and averaged gas flow rate through the top ring
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Static top-ring/groove configuration and dynamic situation under 6000 rpm/no-load condition
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Gas flow rate through the second ring under the 6000/no-load condition
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Different top ring barrel faces
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Simultaneous top ring flutter and collapse with an offset barrel face under 6000 rpm/no-load
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Gas flow rate through top-ring/liner interface during top ring collapse
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Actual gap sizes of top two rings under WOT
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Main gas flow and blow-by under 6000 rpm/WOT
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Original and optimized designs
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Top ring dynamics under 6000 rpm/no-load with optimized design
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Comparison of top ring dynamics under 6000 rpm/WOT of two designs
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Results with the optimized design
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Top ring dynamics under 4000 rpm/WOT
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Land pressures under 4000 rpm/WOT
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Gas flow rate via different routes through the top ring during the exhaust stroke
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Top ring and bore scuffing
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Lubrication between top ring and liner
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Top-ring/bore asperity contact pressure
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Influence of oil properties
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Influence of barrel profile
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Influence of liner roughness
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Top-ring/piston-groove microwelding
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Influence of the piston groove tilt on the contact pressure distribution between the lower flank of the top ring and the groove

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