Changes in Surface Topography and Light Load Hardness in Thrust Bearings as a Reason of Tribo-Electric Loads

The article focuses on the findings of endurance tests on thrust bearings. In addition to the mechanical load (axial load: 10 ≤ C0/P ≤ 19, lubrication gap: 0.33 µm ≤ h0 ≤ 1.23 µm), these bearings are also exposed to electrical loads (voltage: 20 Vpp ≤ U0 ≤ 60 Vpp, frequency 5 kHz and 20 kHz), such a...

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Bibliographic Details
Published in:Lubricants 2024-09, Vol.12 (9), p.303
Main Authors: Graf, Simon, Koch, Oliver
Format: Article
Language:English
Subjects:
Analysis
Axial loads
bearing currents
Boundary conditions
Electric contacts
Electrical loads
Fatigue tests
Frequency converters
Hardness
light load hardness
Lubricants
Lubricants & lubrication
Lubricants industry
Lubrication and lubricants
mechanical and electrical loads
Microscopy
Oxidation
Roller bearings
Sensors
surface topography
Thrust bearings
Topography
tribo-electric contact
Vibration
Wear particles
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Summary:The article focuses on the findings of endurance tests on thrust bearings. In addition to the mechanical load (axial load: 10 ≤ C0/P ≤ 19, lubrication gap: 0.33 µm ≤ h0 ≤ 1.23 µm), these bearings are also exposed to electrical loads (voltage: 20 Vpp ≤ U0 ≤ 60 Vpp, frequency 5 kHz and 20 kHz), such as those generated by modern frequency converters. In a previous study, the focus was on the chemical change in the lubricant and the resulting wear particles. In contrast, this article focuses on the changes occurring in the metallic contact partners. Therefore, the changes in the surface topography are analysed using Abbott–Firestone curves. These findings show that tests with an additional electrical load lead to a significant reduction in roughness peaks. A correlation to acceleration measurements is performed. Moreover, it is shown that the electrical load possibly has an effect on the light load hardness. An increase in the occurring wear could not be detected during the test series. Also, a comparison with mechanical reference tests is made. The article finally provides an overview of different measurement values and their sensitivity to additional electrical loads in roller bearings.
ISSN:2075-4442
2075-4442
DOI:10.3390/lubricants12090303