SAE J3039_202012

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Definition and Measurement of Power Transfer Unit Speed-Dependent Parasitic Loss

Published by	Publication Date	Number of Pages
SAE	2020	–

Description

SAE J3039 – Definition and Measurement of Power Transfer Unit Speed-Dependent Parasitic Loss

This SAE Recommended Practice covers power transfer units (PTUs) used in passenger car and sport utility vehicles to support all wheel drive (AWD) operation. PTUs are typically full-time use geared devices (see 3.1). Some PTUs have additional features such as part-time on-demand capability via electronically actuated disconnect features and other configurations are possible.