Browse Publications Technical Papers 2009-36-0199
2009-10-06

Energy Efficiency Equipped Solutions for Driveline Applications A Contribution to Sustainability and Reduction of CO2 - Emission 2009-36-0199

The bearing industry has been working on innovative concepts to reduce friction in the vehicle's powertrain.
Being part of the driveline the various gearbox types offer still a certain potential of reducing mechanical power loss while transfering engine power. One source of friction and power loss are roller bearings and shaft seals.
A detailed bearing analysis by means of our software “ Vehicle Environmental Performance Simulator ” reveals the potential of friction optimised bearing geometries. Respecting vehicle features and the engine map, the contribution of bearing friction on the CO2 emission of the vehicle can be calculated. This approach permits the definition of an optimized bearing concept in terms of service life, stiffness and friction.
Indeed loaded roller bearings and ball bearings show different friction characteristics. Since also the loading situation is decisive and depends on the position of the bearing, roller bearings and ball bearings will be used in a well-balanced way to meet increasing CO2 emission reduction demand.
This “ Energy Efficiency Portfolio ” is introduced here. The portfolio consists of single bearings and bearing units; the latter offers added-value by simplifying assembly and adjustment process.
Additionally to the bearings also the shaft seals contribute to the efficiency rate of a gearbox and modifications on the seal lip design can minimize its power loss as well. Details are described in the last part of this lecture.

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