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Research Papers: Applications

Experimental Investigations to Use Splash Lubrication for High-Speed Gears

[+] Author and Article Information
A. Neurouth

ECAM Lyon, INSA-Lyon,
LabECAM,
Université de Lyon,
Lyon 69005, France;
INSA-Lyon, LaMCoS,
UMR CNRS 5259,
Université de Lyon,
Villeurbanne 69621, France;
CETIM,
Senlis 60304, France
e-mail: adrien.neurouth@gmail.com

C. Changenet

ECAM Lyon, INSA-Lyon,
LabECAM,
Université de Lyon,
Lyon 69005, France
e-mail: christophe.changenet@ecam.fr

F. Ville

INSA-Lyon, LaMCoS,
UMR CNRS 5259,
Université de Lyon,
Villeurbanne 69621, France
e-mail: fabrice.ville@insa-lyon.fr

M. Octrue

CETIM,
Senlis 60304, France
e-mail: michel.octrue@cetim.fr

E. Tinguy

TOTAL, CReS,
Solaize 69360, France
e-mail: eric.tinguy@total.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 28, 2016; final manuscript received March 6, 2017; published online July 10, 2017. Assoc. Editor: Liming Chang.

J. Tribol 139(6), 061104 (Jul 10, 2017) (7 pages) Paper No: TRIB-16-1403; doi: 10.1115/1.4036447 History: Received December 28, 2016; Revised March 06, 2017

In order to use electric motors which run up to 40,000 rpm in future automotive applications, this study aims to experimentally investigate if splash lubrication technique is worth considering for high-speed gears, i.e., for tangential gear speed up to 60 m/s. To this end, a specific test rig has been used to operate a single spur or helical gear in various operating conditions (lubricant, oil sump volume, temperature, etc.). Churning loss is measured and, as the fraction of air in the lubricant (namely, oil aeration) can be influential on this source of dissipation, a specific sensor is also employed for online monitoring of oil sump aeration. By inserting some moveable walls in the gearbox, it is demonstrated that churning losses and oil aeration can be significantly reduced by mounting these flanges at an appropriate distance to the gear lateral faces. Based on dimensional analysis, an engineering criterion is proposed to properly choose the clearance between the tested gear and the flanges.

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References

Figures

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Fig. 4

X-ray measurement principle

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Fig. 5

Influence of flanges on lubricants aeration

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Fig. 6

Influence of flanges on churning losses

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Influence of flanges on churning losses generated by gear 1 in oil 2

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Fig. 8

Effect of symmetrical or unsymmetrical clearances on churning losses

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Fig. 9

Effect of symmetrical or unsymmetrical clearances on oil aeration

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Fig. 10

Influence of flanges on churning losses generated by a helical gear

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Fig. 11

Oil tank in churning test rig

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Fig. 12

Influence of flanges at high immersion depth

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Fig. 13

Churning losses evolution with oil viscosity

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Fig. 14

Analysis of churning losses evolutions through dimensionless numbers for a wide range of operating conditions

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