AEconoguide - The Low Friction Piston

Rhodes, Mary; Parker, David

doi:10.4271/840181

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…Rhodes and Parker demonstrated that significant improvements in piston skirt frictional losses may be achieved through proper design of the skirt operating shape to reduce the oil-film contact area [7]. The results of this study indicate that the skirt profile and corresponding oil-film contact area undergo extreme transient variations across the cycle.…”

Section: Piston Design For Optimum Lubrication and Lowmentioning

confidence: 93%

“…Li et al demonstrated that neglecting the piston and pin inertia in the transverse and tilt coordinates results in less than 1 percent error in the predicted piston tilt and eccentricity [7]. Therefore, neglecting F] p , F°m, and M IP and eliminating F c in equations (2) …”

Section: Fig B Piston and Connecting Rod Assembly Free Body Diagrammentioning

confidence: 98%

“…Rhodes and Parker introduced a piston with reduced skirt bearing area to minimize piston friction and improve lubrication [7]. The piston incorporates three profiled contact pads machined above the remaining skirt area to reduce the typical skirt contact area by 25 to 30 percent.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Role of Piston Distortion on Lubrication in a Reciprocating Engine

Blair

Hoult

Wong

1990

Journal of Engineering for Gas Turbines and Power

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The microgeometry of the piston, rings, and skirt relative to the liner strongly influences lubrication in a reciprocating engine. This study develops an approximation technique that decouples the thermomechanical piston-skirt distortions from the complex lubricant support in a large diesel engine. The model considers the limiting case of starved skirt lubrication with large clearance. It permits efficient design of machined three-dimensional piston-skirt contours for piston support. In the calculations, a three-dimensional finite-element model is coupled with a postprocessing algorithm to predict skirt distortions, piston tilt, operating clearance, and oil-film contact area as a function of machined profile, thermal expansion, cylinder pressure, piston inertia, and transient side loads. A piston dynamics model is developed that defines the transient piston side force based on engine geometry, cylinder pressure, inertial loads, and wrist-pin offset. The results of this study indicate that (1) the transient skirt distortions due to cylinder pressure on the compression and power strokes result in a significant increase in oil-film contact area; (2) the piston skirt operating shape depends on the location and area of oil-film contact;(3) the contact area and location during intake and exhaust strokes vary substantially from that during the compression and power strokes; (4) the wrist-pin off set reduces the maximum side load and piston slap intensity occurring in the region of maximum cylinder pressure; (5) effective three-dimensional skirt profile design may result in significant changes in oil-film contact area and location on the skirt throughout the cycle.

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Section: Piston Design For Optimum Lubrication and Lowmentioning

confidence: 93%

Section: Fig B Piston and Connecting Rod Assembly Free Body Diagrammentioning

confidence: 98%