1. October 30, 2007 © SKF Group Slide 0

2. Low Friction / Energy Efficient Rolling Bearings Presentation to : TAPPSA Members Date: 23 September 2010 Presenter : Greg Sassen Application Engineer – SKF South Africa

3. October 30, 2007 © SKF Group Slide 2 Agenda Introduction SKF E2 Energy Efficient Deep Groove Ball Bearings Energy Efficient Fan Bearing Solution General discussion

4. October 30, 2007 © SKF Group Slide 3 Energy consumption is projected to grow by 50% over the 2005 to 2030 period. Energy demand to increase by 85% for Non-Organisation For Economic Co-operation and development (OECD) countries. Energy demand to increase by 19% in OECD countries. Global energy trends – International Energy Outlook (IEO2008) projections World Market Energy Consumption forecast 2005-2030

5. October 30, 2007 © SKF Group Slide 4 History of rolling bearing development

6. October 30, 2007 © SKF Group Slide 5 Rolling friction versus sliding friction? Rolling bearings - rolling friction Plain bearings -sliding friction

7. October 30, 2007 © SKF Group Slide 6 Reduced power loss and total cost of ownership Energy cost is 95% of total cost of ownership of electrical motor Using Energy Efficient deep groove ball bearings Reduces energy consumption, thus energy bill Contributes to increase the electrical motor efficiency Anticipates the future e-motor efficiency legislations worldwide Provides longer bearing service life 95%

8. October 30, 2007 © SKF Group Slide 7 Benefits of energy efficient rolling bearings Less friction Higher Reference speed Longer relubrication intervals Less power consumption Lower operating temperature

9. October 30, 2007 © SKF Group Slide 8 SKF Energy Efficient (E2) deep groove ball bearings

10. October 30, 2007 © SKF Group Slide 9 Test conditions: SKF E2. versus SKF standard 6203-2Z size Radial load: 120N Friction torque: value after 24h 3 speeds in rpm: (2000, 4000, 16000) Testing Temperature on OD: 30 °C Friction torque test on SKF AV1-RIG

11. October 30, 2007 © SKF Group Slide 10 Test results – E2.6203-2Z/C3 on SKF AV1 Rig Energy savings Friction torque and energy consumption Speed

12. October 30, 2007 © SKF Group Slide 11 Friction Torque test overview Test conditions: SKF E2 design versus SKF standard 6306 size 2 load cases: C/P=10 & C/P=15 3 temperatures (70/85/100°C) 3 speeds in rpm

13. October 30, 2007 © SKF Group Slide 12 Lower friction torques for SKF E2.6206-2Z/C3 Energy Efficient Bearings

14. October 30, 2007 © SKF Group Slide 13 Service Life test results – SKF ROF tests SKF E2 Energy Efficient bearings have been subjected to SKF ROF service life tests. Test conditions: Test temperature - 150°C Reference size - 6203 Speed - 10000 rpm (285 000 ndm)

15. October 30, 2007 © SKF Group Slide 14 Fan energy consumption Fans are consuming 20% of industrial world energy That’s equivalent with the energy consumption of 150 million houses or 470 nuclear power plant reactors From a Life Cycle Cost perspective, up to 90% of the total cost of the fan is energy

16. October 30, 2007 © SKF Group Slide 15 Typical fan bearing arrangement Non-Located Bearing Located Bearing

17. October 30, 2007 © SKF Group Slide 16 Evolution of spherical roller bearing performance

18. October 30, 2007 © SKF Group Slide 17 The E2 spherical roller bearing solution +

19. October 30, 2007 © SKF Group Slide 18 How the E2 solution was achieved Bearing Decreased number of rollers Optimised surface finish on bearing raceways and rolling elements Optimised rolling element and raceway profiles. Fewer cage pockets Manganese phosphated cage pocket surfaces Lubricant Specialised SKF LESA 2 grease

20. October 30, 2007 © SKF Group Slide 19 Cross location – Housing bore too small or oval

21. October 30, 2007 © SKF Group Slide 20 Outer ring creep caused by unbalance

22. October 30, 2007 © SKF Group Slide 21 SKF Fan Solution SKF Explorer CARB Non-located bearing Located bearing

23. October 30, 2007 © SKF Group Slide 22 Self aligning bearing solution Compact Aligning Roller Bearing (CARB) CARB guarantees frictionless axial movement No possibility to create internal axial forces Load is always distributed evenly Stress is minimized and bearing function improved FrFr F a =0

24. October 30, 2007 © SKF Group Slide 23 Potential applications for energy efficient bearings Electric motors Fans & blowers Conveyor idler rollers Pumps

25. October 30, 2007 © SKF Group Slide 24 Questions?