Wear Development in Oscillating Rolling Element Bearings
Abstract
:1. Introduction
1.1. Oscillating Bearings in Wind Turbines
1.2. Wear in Oscillating Bearings
2. Materials and Methods
2.1. Experimental Setup
2.2. Methods of Analysis
2.3. Experimental Conditions
2.3.1. Experimental Condition—7208 Bearings
2.3.2. Experimental Conditions on 7220 Bearings
3. Results
3.1. Wear Development 7208
3.2. Wear Development 7220
4. Discussion
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
ACBB | Angular Contact Ball Bearing |
HSS | High-Speed Steel |
IPC | Individual Pitch Control |
CPC | Collective Pitch Control |
Z | Number of Rolling Elements |
Basic Dynamic Load Rating | |
Equivalent Dynamic Bearing Load | |
Basic Fatigue Life Rating | |
f | Oscillation Frequency |
Oscillation Angle | |
Amplitude Ratio/Ratio of Moved Distance x | |
to Double Half-Width of the Contact Ellipse b | |
Maximum Contact Pressure | |
Outer Diameter | |
Steady State Torque | |
Maximum Torque | |
Dissipated Friction Energy | |
Energy Wear Factor |
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Parameter | 7208 | 7220 | Unit |
---|---|---|---|
Type | Angular Contact Ball Bearing (ACBB) | ACBB | - |
Inner Diameter d | 40 | 100 | mm |
Outer Diameter D | 80 | 180 | mm |
Diameter Rolling Element | 11.9 | 25.4 | mm |
Number of Rolling Elements Z | 14 | 15 | - |
Contact Angle | 40 | 40 | |
Basic Dynamic Load Rating | 36,000 | 142,000 | N |
Parameter | Grease 1 | Unit |
---|---|---|
Thickener Type | Lithium | - |
Base Oil Type | Synthetic (PAO) | - |
Base Oil Viscosity | 50 | cSt at 40 C |
Oil Separation Rate (IP 121) | 4 | % |
Dropping Point | >180 | C |
Additives | Fully Additivated + Solid Lubricants | - |
Parameter | 7208 | 7220 | Unit |
---|---|---|---|
Axial Load | 12.4 | 90 | kN |
Contact Pressure | 2 | 2.5 | GPa |
-Ratio | 5 | 2.8 | - |
Oscillation Frequency f | 5 | 0.5 | Hz |
Oscillation Angle | 7 | 4 | |
Amplitude Ratio x/2b | 4 | 2.6 | - |
Cycles | 1, 5, 10, 20, 40, 80, 160 | 0.5, 1, 2, 3, 4, 5, 20, 40, 340, 1000 | ×10 |
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Wandel, S.; Bartschat, A.; Glodowski, J.; Bader, N.; Poll, G. Wear Development in Oscillating Rolling Element Bearings. Lubricants 2023, 11, 117. https://doi.org/10.3390/lubricants11030117
Wandel S, Bartschat A, Glodowski J, Bader N, Poll G. Wear Development in Oscillating Rolling Element Bearings. Lubricants. 2023; 11(3):117. https://doi.org/10.3390/lubricants11030117
Chicago/Turabian StyleWandel, Sebastian, Arne Bartschat, Jakob Glodowski, Norbert Bader, and Gerhard Poll. 2023. "Wear Development in Oscillating Rolling Element Bearings" Lubricants 11, no. 3: 117. https://doi.org/10.3390/lubricants11030117