This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Side-Load Capacity of an Unlubricated Ringless Piston
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1990 by SAE International in United States
Annotation ability available
The side-load capacity of an unlubricated ringless piston assembly was calculated for a four-stroke I.C. engine for possible application to a Low-Heat-Rejection engine. A compressible flow analysis for an ideal gas was used to calculate the flow at the piston-cylinder interface. The analysis accounts for the gas inertia effect and possible choked flow. The piston side-load capacity is compared with the actual side thrust on the piston, generated through the combination of piston inertia, cylinder pressure, and connecting rod angularity. It was found that a carefully designed ringless piston can support the side load of a slider-crank mechanism during the power stroke of a four-stroke engine. However, during the remaining strokes, the load can be supported only partially.
|Technical Paper||Trajectory of a Ringless Piston within the Cylinder of an Internal Combustion Engine with a Crosshead Design|
|Technical Paper||Piston Rings, Pistons, and Cylinders|
|Technical Paper||PISTON RING DESIGN AND APPLICATION|
CitationMourelatos, Z., "Side-Load Capacity of an Unlubricated Ringless Piston," SAE Technical Paper 900688, 1990, https://doi.org/10.4271/900688.
- Bupara, S. S. 1979 “Analytical Feasibility Study of a Hydrostatically Supported Piston Ring for Application of Adiabatic Diesel Engines,” Mechanical Technology Incorporated
- Hoult, D. P. 1983 “Lubrication and Support of a Single Piston Ring,” The MIT Report
- Mourelatos, Z. P. 1988 “Trajectory of a Ringless Piston within the Cylinder of an Internal Combustion Engine with a Crosshead Design,” Transactions of the Society of Automotive Engineers 1988 Paper No. 880194
- Mourelatos, Z. P. 1988 “Gas Lubrication of a Ringless Piston in an Internal Combustion Engine under Dynamic Loading,” ASME Journal of Tribology 110 4 718 726
- Mourelatos, Z. P. 1989 “Compressible Gas Flow Between Closely Spaced Plates,” Research Publication GMR-, General Motors Research Laboratories
- Mourelatos, Z. P. 1989 “Hydrodynamic Analysis of a Slider Gas Bearing Including the Gas Inertia Effect,” Research Publication GMR- General Motors Research Laboratories
- Shapiro, W. 1984 “Development of Gas-Lubricated Pistons for Heavy-Duty Diesel Engine Technology Program,” Mechanical Technology Incorporated
- Timoney, S. Flynn, G. 1983 “A Low Friction, Unlubricated SiC Diesel Engine,” SAE Paper 830313
- Wade, W. R. Havstad, P. H. Rao, V. D. Aimone, M. G. Jones, C. M. 1987 “A Structural Ceramic Diesel Engine - The Critical Elements,” SAE Paper 870651