Abstract
Many efforts have been made to understand the impacts of the requirements brought by electrification to other powertrain subsystems than just the engine and battery, as several countries plan to ban the sale of gasoline and diesel-powered vehicles by 2030. The main requirement is the high rotation speed provided by electric motors when compared to combustion engines. Because of this large difference in rotational speed between these motor types, the gearing design to meet the requirements of electrification needs to be evaluated to be durable, efficient, and less noise pollution. This research presents an analysis of the pitting damaged area in spur gears based on experimental data obtained in a controlled fatigue test executed in a back-to-back test machine. The designed gear aimed to replicate in a gear bench test dynamic phenomenon with occurs on a referred first gear used in automotive transmission, based on contact stress magnitude. This work sought to correlate the impacts of diamond-like carbon (DLC) coating and a modified DLC coating with a metal-based layer (chromium nitride) on AISI 4320 steel carburized gears on noise level emitted during contact fatigue tests, as well as to evaluate the maximum daily exposure time that a person can be exposed to noise, without the use of personal protective equipment. The DLC coating showed the lowest average sound pressure levels among the investigated conditions (4.2 times smaller if compared with Cr-DLC coating or uncoated gears), which was attributed to the higher surface hardness and lower pitting damage.
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Acknowledgements
The authors acknowledge the Fiat Chrysler Automobiles (FCA), Surface Phenomena Laboratory at the University of São Paulo, the Surface and Contact Laboratory, and the Multiuser Center for Material Characterization at UTFPR for the human support and laboratory structure.
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da Silva, F.S.R., Franco, R.R., Dalcin, R.L. et al. Impacts of DLC and Cr-DLC coatings on noise level emitted during contact fatigue tests on AISI 4320 steel carburized gears. J Braz. Soc. Mech. Sci. Eng. 46, 389 (2024). https://doi.org/10.1007/s40430-024-04985-w
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DOI: https://doi.org/10.1007/s40430-024-04985-w