This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Influence of Lubricant Rheology on Friction in the Piston Ring-Pack
Annotation ability available
Sector:
Language:
English
Abstract
A piston ring-pack lubrication model has been developed which takes into account both lubricant viscosity/temperature and viscosity/shear rate variations. In addition, lubricant starvation of the upper piston rings, due to restriction of the oil supply by the lower rings, has been included. Inputs to the model include piston ring profiles (measured using Talysurf profilometry) and gas pressure distributions throughout the ring-pack. The latter were calculated using the (known) combustion chamber pressure diagram at the relevant engine operating conditions.
The model was validated by comparing predicted oil film thicknesses with those measured using a laser-induced fluorescence technique on a Caterpillar-1Y73 single-cylinder diesel engine. The engine was run at a range of speeds with two different, fully formulated, multigrade lubricants, and the oil film thickness under each of the piston rings was measured. Good agreement was found between measured and predicted oil film thicknesses, although lubricant shear thinning effects had to be included to obtain satisfactory agreement for the top compression ring. Following validation, the lubrication model was used to predict frictional losses in a diesel engine, for a range of lubricant rheological properties.
Recommended Content
Authors
Topic
Citation
Taylor, R., Brown, M., Thompson, D., and Bell, J., "The Influence of Lubricant Rheology on Friction in the Piston Ring-Pack," SAE Technical Paper 941981, 1994, https://doi.org/10.4271/941981.Also In
References
- Burnett P.J. “Relationship Between Oil Consumption, Deposit Formation and Piston Ring Motion for Single Cylinder Diesel Engines” SAE 920089
- Brown M.A. McCann H. Thompson D.M. “Characterisation of the Oil Film Behaviour Between the Liner and Piston of a Heavy-Duty Diesel Engine” SAE 932784
- Castleman R.A. “A Hydrodynamic Theory of Piston Ring Lubrication” Physics 7 September 1936 364 367
- Eilon S. Saunders O.A. “A Study of Piston Ring Lubrication” Proc. Inst. Mech. Engrs. 171 11 1957 427 433
- Furuhama S. “A Dynamic Theory of Piston Ring Lubrication” Bull. J.S.M.E., First Report - Calculation 2 1960 423 Second Report - Experiment 3 1960 291 Third Report - Measurement of Oil Film Thickness 4 1961 744
- Ting L.L Mayer, J.E. Jr. “Piston Ring Lubrication and Cylinder Bore Wear Analysis” A.S.M.E. Journal of Lubrication Technology, Part I - Theory 96 1974 305 314 Part II - Theory Verification 96 1974 258 266
- Dowson D. Economou P.N. Ruddy B.L. Strachan P.J. Baker A.J.S. “Piston Ring Lubrication - Part II. Theoretical Analysis of a Single Ring and a Complete ring-pack” Energy Cons. through Fluid Film Lubr. Technology: Frontiers in Research & Design Rohde S.M. Wilcock D.F. Cheng H.S. ASME Publication 1979 23 52
- Jeng Y-R. “Friction and Lubrication Analysis of a Piston Ring-Pack” SAE 920492
- Jeng Y-R. “Theoretical Analysis of Piston-Ring Lubrication Part I - Fully Flooded Lubrication” Trib. Trans. 35 1992 696 706
- Jeng Y-R. “Theoretical Analysis of Piston-Ring Lubrication Part II - Starved Lubrication and its Application to a Complete ring-pack” Trib. Trans. 35 1992 707 714
- Keribar R. Dursunkaya Z. Fleming M.F. “An Integrated Model of ring-pack Performance” Trans. A.S.M.E. 113 1991 382 389
- Cameron A. “Basic Lubrication Theory” Third Ellis Horwood Ltd. 1983
- Wong V.W. Hoult D.P. “Experimental Survey of Lubricant-Film Characteristics and Oil Consumption in a Small Diesel Engine” SAE 910741
- Phen R.V. Richardson D. Borman G. “Measurements of Cylinder Liner Oil Film Thickness in a Motored Diesel Engine” SAE 932789
- Rajalingam C. Rao B.V.A. Prabhu B.S. “The Effect of a Non-Newtonian Lubricant on Piston Ring Lubrication” Wear 50 1978 47 57
- Johnson, M.W. Jr. Mangkoesoebroto S.P. “Thin Film Theory for the Power Law Fluid with Application to Piston Ring Lubrication” SAE 922285
- Hoult D.P. Wong V.W. Azzola J.H. “Direct Observation of the Friction Reduction of Multigrade Lubricants” SAE 910742
- Flumerfelt R.W. Pierick M.W. Cooper S.L. Bird R.B. “Generalised Plane Couette Flow of a Non-Newtonian Fluid” I and EC Fundamentals 8. 2 1969 354 357
- Wright B. van Os N.M. Lyons J.A. “European Activity Concerning Engine Oil Viscosity Classification - Part IV - The Effects of Shear Rate and Temperature on the Viscosity of Multigrade Oils” SAE 830027
- Hamatake T. Kitahara T. Wakuri Y. Soejima M. “Friction Characteristics of Piston Rings in a Reciprocating Engine” Lubrication Science 6 1 October 1993 21 40
- Taylor R.I. Bell J.C. “The Influence of Lubricant Degradation on Friction in the Piston Ring-Pack” The 20 th Leeds-Lyon Symposium on Tribology, Lyon September 1993