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Research Papers: Hydrodynamic Lubrication

Systematical Analysis Method for the Mechanical Behaviors of Crankshaft-Bearing System

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

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

Zhixian He, Zhen Li

Department of Mechanical Engineering,
Anhui University of Technology and Science,
Wuhu 241000, China

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 29, 2015; final manuscript received March 21, 2016; published online August 11, 2016. Assoc. Editor: Joichi Sugimura.

J. Tribol 139(2), 021702 (Aug 11, 2016) (9 pages) Paper No: TRIB-15-1388; doi: 10.1115/1.4033362 History: Received October 29, 2015; Revised March 21, 2016

Various mechanical behaviors will happen at the same time when an engine operates. Based on this concept, in this paper, a systematical analysis method is presented to analyze the multiple mechanical behaviors (tribology, dynamics, stiffness, and strength) of the crankshaft-bearing system in an engine. By this method, the analyses of the tribology of bearing, the dynamics of crankshaft-bearing system and the dynamic stress of crankshaft can be accomplished simultaneously. For example, the effect of the journal misalignment of crankshaft and the elastic deformation of bearing bush on the dynamics of crankshaft-bearing system, the tribological performances of main bearings and the dynamic stress of crankshaft are analyzed emphatically. The results show that the journal misalignment of crankshaft and the elastic deformation of bearing bush have remarkable effect on the tribological performances of main bearings and the dynamic stress of crankshaft, but have little effect on the dynamics of crankshaft-bearing system.

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References

Singh, D. V. , Sinhasan, R. , and Pal, R. , 1989, “ Performance Characteristics of an Ungrooved Big-End Bearing With Misalignment,” Tribol. Trans., 32(2), pp. 234–238. [CrossRef]
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Mourelatos, Z. P. , 2001, “ A Crankshaft System Model for Structural Dynamic Analysis of Internal Combustion Engines,” Comput. Struct., 79, pp. 2009–2027. [CrossRef]
Ebrat, O. , Mourelatos, Z. P. , Vlahopoulos, N. , and Vaidyanathan, K. , 2004, “ Calculation of Journal Bearing Dynamic Characteristics Including Journal Misalignment and Bearing Structural Deformation,” Tribol. Trans., 47(1), pp. 94–102. [CrossRef]
Sun, J. , and Gui, C. L. , 2007, “ Effect of Lubrication Status of Bearing on Crankshaft Strength,” ASME J. Tribol., 129(4), pp. 887–894. [CrossRef]
Sun, J. , Gui, C. L. , and Wang, Z. H. , 2008, “ Research on Elastohydrodynamic Lubrication of a Crankshaft Bearing With a Rough Surface Considering Crankshaft Deformation,” J. Automob. Eng., 222(12), pp. 2403–2414. [CrossRef]
Sun, J. , Cai, X. X. , and Liu, L. P. , 2010, “ Research on the Effect of Whole Cylinder Block on EHL Performance of Main Bearings Considering Crankshaft Deformation for Internal Combustion Engine,” ASME J. Tribol., 132(4), p. 044502. [CrossRef]
Sun, J. , Zhao, X. Y. , and Wang, H. , 2011, “ Lubrication Analysis of Crankshaft Bearing Considering Crankshaft Deformation,” SAE Paper No. 2011-01-0613.
Sun, J. , Zhu, X. L. , Zhang, L. , Wang, X. , Chai, X. , Yin, W. , and Shi, W. , 2014, “ Experimental Research on a Three-Dimensional Journal Orbit of a Crankshaft Bearing for an Internal Combustion Engine,” ASME J. Tribol., 136(3), p. 031708. [CrossRef]
Sun, J. , Wang, J. F. , and Gui, C. L. , 2010, “ Whole Crankshaft Beam-Element Finite Element Method for Calculating Crankshaft Deformation and Bearing Load of Engine,” J. Eng. Tribol., 224(3), pp. 299–303.
He, Z. X. , 2006, “ Coupling Researches on Dynamics Tribology Stiffness and Strength in the Crankshaft-Bearing System of Internal Combustion Engine,” Ph.D. thesis, Hefei University of Technology, Hefei, China.
Sun, J. , and Gui, C. L. , 2004, “ Hydrodynamic Lubrication Analysis of Journal Bearing Considering Misalignment Caused by Shaft Deformation,” Tribol. Int., 37(10), pp. 841–848. [CrossRef]
Sun, J. , Gui, C. L. , and Li, Z. , 2002, “ A Review of Crankshaft Strength Analysis for Internal Combustion Engines,” Trans. CSICE, 20(2), pp. 179–185 (in Chinese).

Figures

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Fig. 2

Crankshaft-bearing system

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Fig. 3

Beam-element finite element model of elastic crankshaft

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Fig. 4

Solid-element finite element model of crankshaft

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Fig. 5

The nodal force component acted on the journal surface of crankshaft at 30 deg crankshaft angle

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Fig. 6

The radial vibration responses of the main journal centers of crankshaft (a) not considering the journal misalignment and the deformation of bearing bush, (b) considering the journal misalignment, and (c) considering the deformation of bearing bush

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Fig. 7

The minimum oil film thicknesses of main bearings against the crankshaft angle in an operating cycle of engine (a) not considering the journal misalignment and the deformation of bearing bush, (b) considering the journal misalignment, and (c) considering the deformation of bearing bush

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Fig. 8

The maximum oil film pressures of main bearings against the crankshaft angle in an operating cycle of engine (a) not considering the journal misalignment and the deformation of bearing bush, (b) considering the journal misalignment, and (c) considering the deformation of bearing bush

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Fig. 9

The oil film pressure distributions at the moment of the maximum value of the maximum oil film pressure of No. 2 main bearing in an operating cycle of engine (a) not considering the journal misalignment and the deformation of bearing bush (the maximum oil film pressure pmax = 56.37 MPa, the crankshaft angle α = 68 °CA), (b) considering the journal misalignment (the maximum oil film pressure pmax = 80.03 MPa, the crankshaft angle α = 48 °CA, the angle of journal misalignment β = 0.033 deg), and (c) considering the deformation of bearing bush (the maximum oil film pressure pmax = 114.1 MPa, the crankshaft angle α = 46 °CA

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Fig. 10

The dynamic stress of crankshaft against the crankshaft angle in an operating cycle of engine

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