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Influence factors on gearbox power loss

Klaus Michaelis (Gear Research Centre FZG, Technische Universitaet München, Garching, Germany)
Bernd‐Robert Höhn (Gear Research Centre FZG, Technische Universitaet München, Garching, Germany)
Michael Hinterstoißer (Gear Research Centre FZG, Technische Universitaet München, Garching, Germany)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 8 February 2011




Besides other approaches, fuel savings in automotive applications and energy savings, in general, also require high‐efficiency gearboxes. Different approaches are shown regarding how to further improve gearbox efficiency. This paper aims to address these issues.


The paper takes the following approach: theoretical and experimental investigations of bearing arrangements and gear design as well as lubricant type and lubricant supply to the components lead to efficiency optimisation.


No‐load losses can be reduced, especially at low temperatures and part‐load conditions when using low‐viscosity oils with a high viscosity index and low oil immersion depth or low spray oil supply of the components. Bearing systems can be optimised when using more efficient systems than cross‐loading arrangements with high preload. Low‐loss gears can contribute substantially to load‐dependent power loss reduction in the gear mesh. Low‐friction oils are available for further reduction of gear and bearing mesh losses. All in all, a reduction of the gearbox losses in an average of 50 per cent is technically feasible.


Results from different projects of the authors and from the literature are combined to quantitatively evaluate the potential of power loss reduction in gearboxes.



Michaelis, K., Höhn, B. and Hinterstoißer, M. (2011), "Influence factors on gearbox power loss", Industrial Lubrication and Tribology, Vol. 63 No. 1, pp. 46-55.



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Copyright © 2011, Emerald Group Publishing Limited

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