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Research Papers: Elastohydrodynamic Lubrication

Influence of Lubricant Pressure Response on Subsurface Stress in Elastohydrodynamically Lubricated Finite Line Contacts

[+] Author and Article Information
Tobias Hultqvist

Division of Machine Elements,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden
e-mail: Tobias.Hultqvist@ltu.se

Aleks Vrcek, Braham Prakash, Pär Marklund

Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden

Roland Larsson

Division of Machine Elements,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 15, 2018; final manuscript received October 8, 2018; published online November 29, 2018. Assoc. Editor: Yonggang Meng.

J. Tribol 141(3), 031502 (Nov 29, 2018) (11 pages) Paper No: TRIB-18-1186; doi: 10.1115/1.4041733 History: Received May 15, 2018; Revised October 08, 2018

In order to adapt to increasingly stringent CO2 regulations, the automotive industry must develop and evaluate low cost, low emission solutions in the powertrain technology. This often implies increased power density and the use of low viscosity oils, leading to additional challenges related to the durability of various machine elements. Therefore, an increased understanding of lubricated contacts becomes important where oil viscosity–pressure and compressibility–pressure behavior have been shown to influence the film thickness and pressure distribution in elastohydrodynamic lubrication (EHL) contacts, further influencing the durability. In this work, a finite line EHL contact is analyzed with focus on the oil compressibility–pressure and viscosity–pressure response, comparing two oils with relatively different behavior and its influence on subsurface stress concentrations in the contacting bodies. Results indicate that increased pressure gradients and pressure spikes, and therefore increased localized stress concentrations, can be expected for stiffer, less compressible oils, which under transient loading conditions not only affect the outlet but also the edges of the roller.

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References

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Figures

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Fig. 1

Computational domain with relevant boundary conditions

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Fig. 2

Compressibility of studied oil with the Dowson and Higginson equation included as reference

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Fig. 3

Viscosity-pressure behavior of LVI260 and PAO Toil=35.8°C

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Fig. 4

Film thickness foot-print for the mineral oil (left) and PAO (right) using the complete set of data for both viscosity and compressibility

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Fig. 5

Film thickness foot print for crossed combinations of mineral oil viscosity with PAO compressibility (left) and PAO viscosity with mineral oil compressibility (right)

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Fig. 6

Pressure and film thickness for PAO and mineral oil in entrainment direction at Y=0 (left) and perpendicular to entrainment direction at X=0 (right)

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Fig. 7

Pressure distribution showing the high pressure zone for the combinations: μMin,ρMin (top left), μMin,ρPAO (top right), μPAO,ρMin (bottom left), and μPAO,ρPAO (bottom right)

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Fig. 8

Von Mises subsurface stress along X at Y=0 for the combinations: (a) μMin,ρMin, (b) μMin,ρPAO, (c) μPAO,ρMin, and (d) μPAO,ρPAO

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Fig. 9

Von Mises subsurface stress along Y at X=0 for the mineral oil (left) and PAO (right) using the complete data sets

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Fig. 10

Film thickness fluctuations for selected time steps: mineral oil (top) and PAO (bottom)

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Fig. 11

Pressure distribution for selected time steps showing the influence of entrapped lubricant, mineral oil (top), and PAO (bottom)

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Fig. 12

Subsurface stress variations in the entrainment direction for selected time steps for the mineral oil (top) and PAO (bottom) showing the influence of the lubricant wave moving through

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Fig. 13

Subsurface stress variations in the Y-direction for selected time steps for mineral oil (top) and PAO (bottom) showing the influence of the entrapped lubricant wave moving through

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