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Viscosity Effects on the Dynamic Characteristics of an Elastic Engine Bearing
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English
Abstract
The dynamic behavior of an engine connecting-rod bearing is related to several parameters and in particular to the elasticity of the bearing and the viscosity of the oil. The computation of the bearing characteristics is achieved in the dynamic isothermal regime for a real polar load diagram and for different values of the lubricant viscosity. The assumption of short bearing is made in order to solve the Reynolds equation.
The pressure distribution and the instant elastic distortions are presented at different intervals for different loads of the engine. The trajectory of the shaft center inside the bearing, the variations of the minimum oil film thickness, the friction torque and the oil flow are compared to the classic results for rigid bearings and different values of the oil viscosity (between 2.5 and 8.5 mPa.s). The distorsions reduce the minimum oil film thickness, increase the friction torque and the oil flow under zero feed pressure.
Even in the case of perfectly smooth surfaces, the elastic distortion introduces a new parameter: the calculated minimum viscosity (CMV) which is estimated to be 1.8 mPa.s for the bearing studied.
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Citation
Fantino, B., Frene, J., and du Parquet, J., "Viscosity Effects on the Dynamic Characteristics of an Elastic Engine Bearing," SAE Technical Paper 852074, 1985, https://doi.org/10.4271/852074.Also In
References
- (1) ASTM Status Report “The Relationship between Hight-Temperature Oil Rheology and Engine Operation”
- (2) FURUHAMA S. “The Temperature of a Crankpin Bearing of an Automobile Engine” ASLE Transactions 10 1967 203 213
- (3) DU J. GODET A. “Assessment of Lubrication Condition in a Big End Bearing by Temperature Measurements, Correlation with High Shear Viscosity” Part. IV - SAE special publication 434 1978
- (4) GOODWIN G. HOLMES R. “Bearing Deformation and Temperature Distribution in Dynamically-loaded Engine Bearings” Tribology-Key to the Efficient Engine. Inst. Mech. Eng. Conference Publications 1982 9 15
- (5) SMITH C.H. “Temperature Variations in Crankshaft Bearing” 9th Leeds-Lyon Symposium on Tribology Leeds (England) Dowson D. Taylor C.M. Godet M. Berthe D. “Tribology of Reciprocating Engines” Butterworths 1983 97 102
- (6) NEALE M.J. “Keynote Address” 9th Leeds-Lyon Symposium on Tribology Leeds (England) 1982 Dowson D. Taylor C.M. Godet M. Berthe D. “Tribology of Reciprocating Engines” Butterworths 1983 1 5
- (7) FANTINO B. FRENE J. DU PARQUET J. “Elastic Connecting-Rod Bearing with Piezoviscous Lubricant: Analysis of the Steady-State Characteristics” Transactions of the ASME Journal of Lubrication Technology 101 April 1979 190 200
- (8) OKRENT E.H. “The Effect of Lubricant Viscoity and Composition on Engine Friction and Bearing Wear” ASLE Trans. 4 97 1961
- (9) PIERRE-EUGENE J. FRENE J. FANTINO B. ROUSSEL G. DU PARQUET J. “Theory and Experiments on Elastic Connecting-Rod Bearings under Steady-State Conditions” 9th Leeds-Lyon Symposium on Tribology Leeds (England) 1982 Dowson D. Taylor C.M. Godet M. Berthe D. “Tribology of Reciprocating Engines” Butterworths 1983 49 54
- (10) CHARRON J.L. “Measurement of Oil Film Thickness in Diesel Motor Main Bearings: Implementation of the Method and Experimental Results” 9th Leeds-Lyon Symposium on Tribology Leeds (England) 1982 Dowson D. Taylor C.M. Godet M. Berthe D. “Tribology of Reciprocating Engines” Butterworths 1983 55 60
- (11) HIRUMA M. FURUHAMA S. “Measurement of Journal Locus in Con-Rod Big-End Bearing of an Automobile Gasoline Engine” Transaction of the ASME, journal of lubricatioin technology 95 April 1973 249 258
- (12) MARTIN F.A. “Developments in Engine Bearing Design” 9th Leeds-Lyon Symposium Leeds (England) 1982 Dowson D. Taylor C.M. Godet M. Berthe D. “Tribology of Reciprocating Engines” Butterworths 1983 7 28
- (13) LABOUFF G.A. BOOKER J.F. “Dynamically Loaded Journal Bearings a Finite Element Treatment for Rigid and Elastic Surfaces” Transaction of the ASME, Journal of Tribology 1985
- (14) FANTINO B. FRENE J. GODET M. “Dynamic Behaviour of an Elastic Connecting-Rod Bearing - Theoretical Study” Studies of Engines Bearings and Lubrication SP-539 SAE 1983 23 32
- (15) OH K.P. GOENKA P.K. “The Elastohydrodynamic Solution of Journal Bearings under Dynamic Loading” Transaction of the ASME 3ournal of Tribology 1985
- (16) VAN DER TEMPEL L. MOES H. BOSMA R. “Numerical Simulation of Dynamically Loaded Flexible Short Journal Bearing”
- (17) FANTINO B. FRENE J. “Comparison of Dynamic Behaviour of Elastic Connecting-Rod Bearing in both Petrol and Diesel Engines” Transaction of the ASME, Journal of Tribology 107 1985 87 91
- (18) LANE G. ROBERTS D.C. TIMS J.M. “Measurement of the Viscosity of Multigrade Oils in a Running Engine” SAE 1977
- (19) ROSENBERG R.C. McMILLAN M.L. “Discussion to SAE Paper 770379” SAE Paper 770628