Experimental investigations to use splash lubrication for high-speed gears

[+] Author and Article Information
A. Neurouth

Université de Lyon, ECAM Lyon, INSA-Lyon, LabECAM, 69005 Lyon, FranceUniversité de Lyon, INSA-Lyon, LaMCoS, UMR CNRS 5259, 69621 Villeurbanne, FranceCETIM, 60304 Senlis, France

C. Changenet

Université de Lyon, ECAM Lyon, INSA-Lyon, LabECAM, 69005 Lyon, France

F. Ville

Université de Lyon, INSA-Lyon, LaMCoS, UMR CNRS 5259, 69621 Villeurbanne, France

M. Octrue

CETIM, 60304 Senlis, France

E. Tinguy

TOTAL, CReS, 69360 Solaize, France

1Corresponding author.

ASME 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). 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 on-line 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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