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TECHNICAL PAPERS

Effect of Lubrication Status of Bearing on Crankshaft Strength

[+] Author and Article Information
Jun Sun, Changlin Gui

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

J. Tribol 129(4), 887-894 (Jun 06, 2007) (8 pages) doi:10.1115/1.2768977 History: Received June 09, 2006; Revised June 06, 2007

There is direct interaction between crankshaft and bearing in an internal combustion engine. The effect of lubrication status of bearing was not considered in the present calculation of crankshaft strength. A given oil film pressure distribution of bearing was generally used as load acted on journal. In this paper, a crankshaft-bearing system was taken as the study object. On the basis of lubrication analysis of misaligned bearing caused by crankshaft deformation, the stress and strength of-crankshaft were calculated using analytical oil film pressure of bearing as the load boundary condition. Crankshaft deformation and bearing load were calculated by whole crankshaft beam-element method. The lubrication of crankshaft bearing was analyzed by the kinetics method. Crankshaft stress was calculated by the finite-element method. The results show that when the effect of crankshaft deformation under load is considered, the offset distribution of oil film pressure of bearing appears and the highest oil film pressure increases remarkably, which result in the stresses of local area on fillet surface of crankshaft journal increase obviously and the safety factor of crankshaft decreases.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Whole crankshaft beam-element model

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Figure 2

Whole crankshaft solid-element model

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Figure 3

No. 3 main bearing load (whole crankshaft beam-element method)

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Figure 4

No. 3 main bearing load (free-beam method)

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Figure 5

Node displacement at 10°CA

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Figure 6

The highest film pressure pmax of No. 1 connecting rod bearing against crankshaft angle CA in a working cycle

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Figure 7

The highest film pressure pmax of No. 4 main bearing against crankshaft angle CA in a working cycle

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Figure 8

The film pressure distribution of No. 1 connecting rod bearing at 388°CA

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Figure 9

The film pressure distribution of No. 4 main bearing at 21°CA

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Figure 10

The film pressure distribution of No. 4 main bearing at 560°CA

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Figure 11

The whole crankshaft finite-element model

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Figure 12

The equivalent stress σ on fillet surface circumference of No. 1 connecting rod journal at 388°CA

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Figure 13

The equivalent stress σ on fillet surface circumference of No. 4 main journal at 21°CA

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Figure 14

The equivalent stress σ on fillet surface circumference of No. 4 main journal at 560°CA

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