Sliding wear behaviour under electromechanical loading of a grease-lubricated ball-on-disk bearing steel contact

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2025-03-13 DOI:10.1016/j.wear.2025.206029

G.V. Balakrishna, R. Gnanamoorthy

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Abstract

Traction motor bearings in electric vehicles experience electromechanical loads and the current flow causes morphological damage to the raceways and rolling elements. The variations in the contact region due to dynamic operating conditions result in different contact mechanisms under combined electrical and mechanical loading. Simulated studies of electromechanical contact between ball and raceway in bearing are carried out in an in-house developed tribo-device. At different applied voltages, variations in friction coefficient and current flow through the contact are reported. A stable current flow at the contact is found to occur beyond a critical applied voltage and this influences the friction and wear characteristics. The wear scars exhibited discharge pits, spot weld regions and abrasive tracks with grease residues. The morphological damages are related to the lubricant film thickness variations within the contact estimated using numerical simulation. Spot weld regions and discharge pits are found in regions of high film thickness and the abrasive tracks in regions of low film thickness.

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油脂润滑球盘轴承钢接触在机电载荷下的滑动磨损行为

电动汽车牵引电机轴承承受机电载荷，电流对轨道和滚动体造成形态损伤。由于动态工况下接触区域的变化，导致电、机械复合载荷作用下接触机制的不同。在自行研制的摩擦装置上，对轴承内滚珠与滚道的机电接触进行了仿真研究。在不同的施加电压下，报告了摩擦系数和通过接触的电流的变化。发现在触点处发生超过临界施加电压的稳定电流，这影响摩擦和磨损特性。磨损痕表现为放电坑、点焊区和有油脂残留的磨痕。数值模拟结果表明，接触部位的形态损伤与接触部位内润滑膜厚度的变化有关。在高膜厚区域发现了点焊区和放电坑，在低膜厚区域发现了磨粒轨迹。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.