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Research Papers: Elastohydrodynamic Lubrication

Thermal Analysis of an Oil Jet-Dry Sump Transmission Gear Under Mixed-Elastohydrodynamic Conditions

[+] Author and Article Information
Ehsan Fatourehchi

The Wolfson School of Mechanical,
Electrical and Manufacturing Engineering,
Loughborough University,
Loughborough LE11 3TU, UK
e-mail: E.Fatourehchi@lboro.ac.uk

Hamed Shahmohamadi

The Wolfson School of Mechanical,
Electrical and Manufacturing Engineering,
Loughborough University,
Loughborough LE11 3TU, UK
e-mail: hamedshah@ucla.edu

Mahdi Mohammadpour

The Wolfson School of Mechanical,
Electrical and Manufacturing Engineering,
Loughborough University,
Loughborough LE11 3TU, UK
e-mail: M.Mohammad-Pour@lboro.ac.uk

Ramin Rahmani

The Wolfson School of Mechanical,
Electrical and Manufacturing Engineering,
Loughborough University,
Loughborough LE11 3TU, UK
e-mail: R.Rahmani@lboro.ac.uk

Stephanos Theodossiades

The Wolfson School of Mechanical,
Electrical and Manufacturing Engineering,
Loughborough University,
Loughborough LE11 3TU, UK
e-mail: S.Theodossiades@lboro.ac.uk

Homer Rahnejat

The Wolfson School of Mechanical,
Electrical and Manufacturing Engineering,
Loughborough University,
Loughborough LE11 3TU, UK
e-mail: H.Rahnejat@lboro.ac.uk

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 27, 2017; final manuscript received February 16, 2018; published online April 26, 2018. Assoc. Editor: Wang-Long Li.

J. Tribol 140(5), 051502 (Apr 26, 2018) (11 pages) Paper No: TRIB-17-1061; doi: 10.1115/1.4039567 History: Received February 27, 2017; Revised February 16, 2018

Improved fuel efficiency and reduced emissions are key drivers for modern drivetrain systems. Therefore, in recent years, dry sumps with air–oil mist lubrication have been used for efficient transmission design in order to reduce the churning losses. With dry sumps, appropriate cooling measures should be implemented to dissipate the generated contact heat in an efficient manner. This paper integrates a tribological model with three-dimensional (3D) thermofluid analysis in order to predict the heat generated in the lubricated meshing gear contacts and its dissipation rate by an impinging oil jet in air–oil mist environment. Such an approach has not hitherto been reported in literature. The results show that the generated heat under realistic conditions cannot be entirely dissipated by the impinging oil jet in the air–oil mist transmission casing. Numerical results are used to derive extrapolated regressed equations for heat transfer purposes for time-efficient analysis. These conform well with the detailed numerical results.

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Figures

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Fig. 1

Schematic representation of the developed model

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Fig. 2

Schematics of specified teeth sections facing the impinging jet

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Fig. 3

Frictional power loss

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Fig. 4

(a) Contours of temperature at the pressure outlet and (b) isobaric temperature distribution at the impinging jet area

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Fig. 5

(a) Contours of oil volume fraction at outlet boundary and (b) oil flow path-lines at in the impinging jet region

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Fig. 6

Contours of pressure at the outlet boundaries

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Fig. 7

Contours of flow velocity at the outlet boundary

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Fig. 8

Heat dissipation from a rotating gear surface for different oil volume fractions

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Fig. 9

Heat dissipation variation for a rotating gear surface with oil jet Reynolds number

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Fig. 10

Heat dissipation variation for a rotating gear surface with gear rotational Reynolds numbers

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Fig. 11

Heat dissipation variation for a rotating gear surface with gear surface temperature

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Fig. 12

Effect of gear temperature increase on the heat transfer coefficient of gear flank

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