1. Customer Training Timken Learn and Lead Part B Cylindrical Roller Bearing Cage Design

2. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 2 Cage Design  TVP = glass fiber reinforced nylon  M = one piece, machined bronze finger or fully milled  S = one piece stamped steel (5200 series & HJIR)  Pin type S Pin type M

3. Customer Training Timken Learn and Lead Precision

4. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 4 ISO Class ABMA ClassUsual Symbol NormalRBEC 1No Symbol (PO) 6RBEC 3P6 5RBEC 5P5 4RBEC 7P4 2RBEC 9P2 Typical Precision Classes (Tolerance) ISO 492 Section for metric roller bearings in increasing precision

5. Customer Training Timken Learn and Lead Application Considerations

6. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 6 Application Considerations  Lubrication  Heat generation  Speed/acceleration  Misalignment

7. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 7 Lubrication  Bearing features –Lubrication grooves and holes in OD –Face scallops / lube from bore (stationary inner / rotating outer) Used in multi-row CRB’s –Spiral bore groove Improved disassembly on roll necks

8. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 8 Torque & Heat Generation  Sources of bearing torque –Elastic deformation (roller-raceway contact) –Cage contact –Flange contact –Lubricant viscous forces

9. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 9 Heat Generation  By design, generate less heat due to minimal friction –Bearing operating temperature must not exceed 250°F (121°C)  Heat will dissipate by oil flow and conduction/convection/radiation through housing material

10. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 10 Speed/Acceleration Considerations  High speeds and acceleration –Concern for large bore and eccentric applications  Lower speeds with light loads –Skid smearing can occur due to lack of roller traction –Min load = 2% of C1

11. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 11 Misalignment  Roller/race profiles –Standard roller/race profiling designed to withstand 0.0005 in/in of misalignment (low to moderate loads) –More complex profiles (MRD) can be used to help reduce edge stresses that develop beyond the defined drops

12. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 12 Misalignment  Flange modifications –Flanges can be heightened, tapered, or include special profiles  Lubrication improvements –Increased oil flow rates to insure contact points generate adequate lube film thickness

13. Customer Training Timken Learn and Lead Part Numbering

14. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 14 Cylindrical Roller Bearing (CRB) Part Numbering - Metric /XXX Designation Cage Design E.TVP, M, S

15. Cylindrical Roller Bearing Product Overview 5/7/2007CRB Product Overview 15 Cylindrical Roller Bearing (CRB) Part Numbering  CRB Configurations –NJ =Cylindrical roller radial bearing (2 ribs on outer ring, 1 rib on inner ring) –NU =Cylindrical roller radial bearing (2 ribs on outer ring, cylindrical inner ring) –NUP =Cylindrical roller radial bearing (2 ribs on outer ring, 1 fixed rib and 1 loose rib/flat washer on inner ring) –RNU =Cylindrical roller radial bearing (2 ribs on outer ring, without an inner ring)  Series –10 = width series 1; diameter series 0 (dimension series 10 – 2 = width series 0; diameter series 2 (dimension series 02) –22 = width series 2; diameter series 2 (dimension series 22) – 3 = width series 0; diameter series 3 (dimension series 03) –23 = width series 2; diameter series 3 (dimension series 23)

16. Customer Training Timken Learn and Lead Timken Cylindrical Roller Bearing Product Overview Part B End of Module Close this window and return to the main menu