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Research Papers: Hydrodynamic Lubrication

Thermohydrodynamic Lubrication Analysis of Misaligned Plain Journal Bearing With Rough Surface

[+] Author and Article Information
Jun Sun, Mei Deng, Yonghong Fu, Changlin Gui

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

J. Tribol 132(1), 011704 (Dec 10, 2009) (8 pages) doi:10.1115/1.4000515 History: Received April 05, 2009; Revised September 25, 2009; Published December 10, 2009; Online December 10, 2009

Journal misalignment exists generally in journal bearings. When severe journal misalignment takes place, the minimum film thickness of journal bearings reduces greatly. In this condition, the surface roughness, the oil viscosity-pressure relationship (VPR), and the thermal effect have obvious effects on hydrodynamic lubrication performance of misaligned bearings. In this paper, the oil film pressure, oil film temperature, load-carrying capacity, end leakage flow rate, frictional coefficient, and misalignment moment of a journal bearing with different angles of journal misalignment and surface roughness, and considering oil VPR and thermal effect, were calculated based on the generalized Reynolds equation, energy equation, and solid heat conduction equation. The results show that the oil VPR and surface roughness have a significant effect on the lubrication of misaligned journal bearings under large eccentricity ratio. The thermal effect will affect obviously the lubrication of misaligned journal bearings when eccentricity ratio and angle of journal misalignment are all large. In the present design, the size of the journal bearing is compact more and more, and the eccentricity ratio and angle of journal misalignment are usually large in operating conditions. Therefore, it is necessary to take the effects of journal misalignment, surface roughness, oil VPR, and thermal effect into account in the design and analyses of journal bearings.

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Figures

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Figure 1

A misaligned journal bearing

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Figure 2

Performance of the journal bearing (ψ0=αang=0 deg, σj=0.4 μm, σb=0.8 μm, γ=1/9) at different angles γang of journal misalignment with the eccentricity ratio ε when considering or not considering thermal effect

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Figure 3

Distribution of oil film pressure and temperature of the journal bearing (ε=0.8, ψ0=αang=0 deg, σj=0.4 μm, σb=0.8 μm, γ=1/9) at different angles γang of journal misalignment when considering or not considering thermal effect

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Figure 4

Performance of the journal bearing (ψ0=αang=0 deg, γ=1/9) with the eccentricity ratio ε at different angles γang of journal misalignment and surface roughness

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Figure 5

Performance of the journal bearing (ψ0=αang=0 deg, σj=0.4 μm, σb=0.8 μm) with the eccentricity ratio ε at different angles γang of journal misalignment and surface pattern parameter γ

Grahic Jump Location
Figure 6

Performance of the journal bearing (ψ0=αang=0 deg, σj=0.4 μm, σb=0.8 μm, γ=1/9) at different angles γang of journal misalignment with the eccentricity ratio ε when considering or not considering VPR of the oil

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