Tribology International, Journal Year: 2024, Volume and Issue: unknown, P. 110424 - 110424
Published: Nov. 1, 2024
Language: Английский
Lubricants, Journal Year: 2024, Volume and Issue: 12(8), P. 268 - 268
Published: July 28, 2024
As public attention is increasingly drawn toward more sustainable transportation methods, the popularity of electric vehicles (EVs) as part solution rapidly expanding. Operating conditions within EVs can be severe compared to standard combustion powertrains, and risk electrical arcing across mechanical surfaces from leakage currents incites additional concern. This study employed a series electro-tribological tests utilizing various moving patterns improve understanding driving for electrically induced bearing damage (EIBD). Rolling ball-on-disk were performed with different polyurea-thickened greases. Rotational initially run at speeds test durations, but was limited. However, unmistakable when reciprocating motion used track lengths speeds. These results suggest that associated length, such number directional changes speed-dependent film thickness, play considerable role in forming damage. work provides critical insights into mechanisms EIBD other systems. It highlights importance operational contribute EIBD, which lead improved designs maintenance practices, ultimately enhancing efficiency lifespan these
Language: Английский
Citations
7
Tribology International, Journal Year: 2025, Volume and Issue: unknown, P. 110526 - 110526
Published: Jan. 1, 2025
Language: Английский
Citations
0
Lubricants, Journal Year: 2025, Volume and Issue: 13(3), P. 108 - 108
Published: March 1, 2025
EV motors and machine elements operate at higher speeds, generate significant heat noise (vibration), subject lubricants (bearings) to multiple degrading factors, requiring thermal stability, wear protection, mitigating mechanisms like pitting scuffing, low electrical conductivity prevent arcing damage bearings. This study evaluates the tribological performance of four types greases—PUEs, PUPao, PUEth (polyurea-based), LiPAO (lithium–calcium complex-based)—to determine their suitability for electric motor Key metrics include properties, resistivity, leakage, bearing noise, behavior. A four-ball test ranks greases by scar diameter as PUPao < PUEs LiPAO, while coefficient friction is observed in range 0.15–0.18, with exhibiting lowest friction. Electrical resistivity tests reveal that grease has resistivity. leakage tests, conducted a voltage differential across bearings, assess damage, showing evidence surface pitting. Optical microscopy scanning electron analysis carried out examine In demonstrates levels, whereas produces highest. Visual microscopic examination further characterizes lubricating properties. Based on overall performance, are ranked applications > LiPAO. The findings highlight critical need selecting appropriate formulations ensure optimal under varying operational conditions.
Language: Английский
Citations
0
Tribology International, Journal Year: 2025, Volume and Issue: unknown, P. 110655 - 110655
Published: March 1, 2025
Language: Английский
Citations
0
Tribology International, Journal Year: 2024, Volume and Issue: 202, P. 110366 - 110366
Published: Nov. 5, 2024
Language: Английский
Citations
1
Tribology Transactions, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 15
Published: Dec. 2, 2024
The flow process and characteristics of lubricating grease have a significant impact on the lubrication performance bearings. Based rheological parameters Cross rheology model, this paper proposed simulation method in groove based user defined functions (UDFs) combined with Finite Volume Method (FVM) verifies rationality through visualization experiments. were studied under three different delivery angles. Additionally, it was observed that ceased to during process, used analyze explain phenomenon.
Language: Английский
Citations
0
Tribology International, Journal Year: 2024, Volume and Issue: unknown, P. 110424 - 110424
Published: Nov. 1, 2024
Language: Английский
Citations
0