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A Pin-on-Disc Study on the Electrified Sliding Wear of EVs Powertrain Gears
Technical Paper
2022-01-0320
ISSN: 0148-7191, e-ISSN: 2688-3627
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Language:
English
Abstract
In contrast to conventional powertrains from internal combustion engine vehicles
(ICEV), the tribological performance of powertrains of electric vehicles (EVs)
must be further evaluated by considering new critical operating conditions such
as electrical environments. The operation of any type of electric motor produces
shaft voltages and currents due to various hardware configurations and factors.
Furthermore, the common application of inverters intensifies this problem. It
has been reported that the induced shaft voltages and currents can cause
premature failure problems in tribological components such as bearings and gears
due to accelerated wear and/or fatigue. It is ascribed to effects of electric
discharge machining (EDM), also named, sparking wear caused by shaft currents
and poor or increasingly diminishing dielectric strength of lubricants. A great
effort has been done to study this problem in bearings, but it has not yet been
the case for gears. Considering that EVs powertrains can be configurated with an
electric motor coupled to a single-speed or multi-speed transmission, it is
expected that shaft currents can also affect gears to some extent. The
pin-on-disc test has been widely used to study sliding wear of gear materials
under comparable or realistic operating conditions. This accelerated test is
effective for screening materials, lubricants and operating conditions allowing
evaluations of their friction and wear properties. However, it has not been
implemented for studying gear materials under electrified environments. Thus,
this paper aims to explore the friction coefficient and wear of gear materials
under non-electrified and electrified sliding in a pin-on-disc tester applying
typical of EVs powertrain shaft currents during sliding. The tests were carried
out at two different DC currents under comparable gear dry and lubricated
sliding contact conditions. Friction coefficient, wear volumes and morphologies
were evaluated and reported in this work.
Authors
Topic
Citation
Cao-Romero-Gallegos, J., Reyes-Avendaño, J., Soriano, J., Erdemir, A. et al., "A Pin-on-Disc Study on the Electrified Sliding Wear of EVs Powertrain Gears," SAE Technical Paper 2022-01-0320, 2022, https://doi.org/10.4271/2022-01-0320.Also In
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