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Technical Briefs

Research on the Effect of Whole Cylinder Block on EHL Performance of Main Bearings Considering Crankshaft Deformation for Internal Combustion Engine

[+] Author and Article Information
Jun Sun, Xiaoxia Cai, Liping Liu

School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, China

J. Tribol 132(4), 044502 (Sep 23, 2010) (6 pages) doi:10.1115/1.4002216 History: Received November 14, 2009; Revised July 16, 2010; Published September 23, 2010; Online September 23, 2010

In this paper, the analyses of elastohydrodynamic lubrication (EHL) of crankshaft bearings considering the deformation of the whole cylinder block and crankshaft under load were carried out for the crankshaft bearing system of a four-stroke four-cylinder internal combustion engine. The lubrication of crankshaft bearing was analyzed by dynamic method. The deformation of bearing surface under pressure of oil film was calculated by compliance matrix method. The results show that when the crankshaft deformation under load is considered, compared with the results of not considering the deformation of cylinder block, the maximum film pressure decreases, the minimum film thickness increases, and the end leakage flow-rate and frictional coefficient of journal surface change little in an engine working cycle when considering the deformation of cylinder block. The models of the whole cylinder block and the single main bearing housing were used, respectively, to calculate the deformation of main bearing surface in the analyses. The results show that the calculation accuracy of the elastohydrodynamic lubrication analyses of crankshaft main bearings can be met basically by applying the simple model based on the single main bearing housing to calculate the elastic deformation of main bearing surface.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Finite element model of cylinder block

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Figure 2

Finite element model of the single main bearing housing

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Figure 3

Maximum film pressure and minimum film thickness of No. 2 main bearing

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Figure 4

End flow-rate and journal frictional coefficient of No. 2 main bearing

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Figure 5

Maximum film pressure and minimum film thickness of No. 2 main bearing

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Figure 6

End flow-rate and journal frictional coefficient of No. 2 main bearing

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