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- 2. History of Inventionsof Rolling Element Bearings
- 3. Primary Function ofBearings • Transmit loads • Reduce Friction • Secondary roles – Support the shaft – Locate the shaft
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- 5. How did abearing evolve ? * Invention of wheel * Wheel rotates on axle * Wear Plate + Rollers * Inner ring + Outer ring + Rollers * With introduction of cage Rolling Bearing was created
- 6. Roller and BallRaceway Contact
- 7. Types of RollingElements Spherical roller (asymmetrical) Spherical roller (symmetrical) Ball Taper roller Needle roller Cylindrical roller
- 8. Bearing Components (Deep GrooveBall Bearing) Seal Rolling Elements Inner Ring Outer ring Cage Seal
- 9. Characteristics ball bearing Deep grooveAngular contact ball bearing Self-aligning ball bearing Ball bearings Point Contact : * Less area of contact * Less friction * More speed * Less load Cylindrical roller bearing Taper Needle roller roller bearing bearing Spherical roller bearing Roller bearings Line Contact : * More area of contact * More friction * Less speed * More load
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- 11. Radial rolling bearings Deepgroove ball bearing Angular contact ball bearing Self-aligning ball bearing Cylindrical roller bearing Taper roller Needle roller bearing bearing Spherical roller bearing Ball bearings Roller bearings Radial rolling bearings
- 12. Thrust ball bearing Ball bearingsRoller bearings Thrust bearings Angular Contact Ball Thrust bearing Taper Roller Thrust bearing Spherical Roller Thrust bearing Cylindrical / Needle Roller Thrust bearing
- 13. Bore surface O.D. surface O.D. Bore BearingTerminology
- 14. Inner ring raceway Sidefaces Inner ring land Outer ring raceway Outer ring land Bearing Terminology
- 15. Ball and RollerBearing Ranges Deep groove Ball bearings Roller bearings + Angular Self-aligning contact Cylindrical Taper Needle Spherical
- 16. Load Capabilities Load carryingcapacity is expressed as the basic dynamic load rating
- 17. Relative Speed Limitations Greaselubrication speed rating Oil lubrication speed rating r/min
- 18. Bearing Contact Angle SingleCylindrical Angular Taper Spherica l Row Roller Contact Roller Roller Radial Loads Combined Loads
- 19. Bearing Components Outer Ring Cage RollingElement Inner Ring
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- 22. Land Riding LipSeal RS1
- 23. Rolling Bearings arePrecision Products 1µ How much is a µ? A human hair 0,06 mm Standard High precision bearing Precision bearing Normal P6 P6 SP P4A UP PA9A PA9B Tolerance classes 0/-15 µm 0/-12 µm 0/-9 µm 0/-7 µm 0/-2,5 µm
- 24. Precision Classes Precision classes:US vis-a-vis Europe ABEC ISO 1 3 5 7 9 Normal P6 P5 P4 P9 – Generally, use bearings no more than one precision class better than the precision of the mating components – Extra precision has no benefit if applied to poorly made mating components
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- 26. Bearing Basics C1 -Less than C2 clearance C2 - less than normal clearance (CN, C0) - normal clearance (not generally marked) C3 - greater than normal clearance (“standard”) C4 - greater than C3 clearance C5 - greater than C4 clearance Example: A 6210 /C3 Ball bearing has from 18 - 36 µm (microns) or 0.0007” - 0.0014” Radial Internal Clearance