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Calculation of Drag Torque Losses by Component of a Transfer Case

Magna Powertrain of America, Inc.-Ricardo Rivera Rodriguez, Carlos Martinez
Published 2019-10-22 by SAE International in United States
In recent decades, fuel economy has become a key indicator of an automaker corporate social responsibility and a market differentiation factor, and ultimately it is regulated by government agencies such as EPA through CO2 emissions compliance tests. The light pick-up truck and SUV production share has been increasing in the last few years, being 4-wheel drive capability one of the main features that customers seek. Within the 4-Wheel Drive system, the transfer case has a significant impact to both torque transfer efficiency and parasitic losses. The scope of this paper is to better understand the parasitic losses of a transfer case by the quantification of its individual drag losses by component. At product development phases, one measurement of interest is the system level spin loss which has a target value defined by the automakers, and contribution by component is often neglected if the system has the expected performance. This study summarizes the tests performed on a 2-speed chain driven transfer case, where as a first step, a baseline spin loss measurement was taken, then theā€¦
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