Customer Training Timken Learn and Lead 5/16/2007Spherical Product Overview1 Nomenclature

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview2 Timken SRB Nomenclature K YM W33 C3 Dimension Series Bore StyleRIC Bore CodeMod. Codes Cage & Style

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview3  Small & Medium Bore sizes  Bore code x 5 = bore size in mm [ex. BORE = 18mm x 5 = 90mm]  Large Bore sizes  Bore code = bore size in mm Example: 232/600YMBW507C08 [ex. Bore = 600mm]  Bore styles  Cylindrical “straight” bore is standard (no designation)  For tapered bore a K will appear in the part description K YM W33 C3 Dimension Series* Bore Style Cage & Style RIC Bore Code* Mod. Codes Timken SRB Nomenclature - Basics Boundary plan established per ABMA Standard 20/ISO 15 Includes bore and dimension series

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview4 One piece cage Machined brass Roller riding Finger type YMYMBYMD One piece cage Machined brass Land riding Finger type Split cage Machined brass Land riding Finger type Brass Cages

Spherical Roller Bearing Product Overview 5/16/2007  Inner rings for brass cage designs Spherical Product Overview5 All brass designs have toe flanges to retain rollers Brass Cages Load slots for rollers Inner ring center flat

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview6 YPCJ Two piece cage Stamped steel Roller riding Pin type cage Uses hardened steel pins Large and small cage rings required per side In some cases a center guide ring is utilized Steel Cages

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview7 Timken SRB Nomenclature Modification Codes K YM W33 C3 Dimension Series Bore Style Cage & Style RIC Bore Code Mod. Codes

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview8 Common Timken Modification Codes  Modification codes are used to add features to a standard SRB assembly  Wide array of existing codes to control tolerances, finishes, material types, RIC, etc. Combination codes also exist to combine mod codes. W8TDC™ coating (thin dense chrome) W22Outer ring with reduced OD tolerance W31Bearing inspected to meet special quality requirements W88Inner ring with reduced bore diameter tolerance W33Lube holes and groove in outer ring W38AUpper two-thirds of specified radial internal clearance

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview9 Timken SRB Nomenclature – Internal Clearance K YM W33 C3 Dimension Series Bore Style Cage & Style RIC Bore Code Mod. Codes

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview10 Clearances – “Unmounted” RIC (Radial Internal Clearance)  Conforms to ABMA/ISO nomenclature and values where available  Standard clearance nomenclature C2, C0, C3, C4, C5  “C” clearances are different for cylindrical bore vs. tapered bore bearings of the same size  Special “C” clearances (i.e. C6, C7, etc) are bearing specific

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview11 Part Number

Customer Training Timken Learn and Lead 5/16/2007Spherical Product Overview12 Precision

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview13 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

Customer Training Timken Learn and Lead 5/16/2007Spherical Product Overview14 Lubrication Considerations

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview15 SRB Lubrication  Can operate with grease, oil bath, circulating oil, oil-air or oil mist systems  Lubrication considerations  Operating temperature  Load  Speed

Spherical Roller Bearing Product Overview 5/16/2007 Spherical Product Overview16 Reference Thermal Speed Ratings  Thermal speed ratings  Based on ISO  Heat generated within bearing is balanced with heat dissipated from the bearing.  Listed for grease and oil bath  Higher speeds allowable with circulating oil systems  Application engineers should review for acceptability and potential need for special bearing modifications

Customer Training Timken Learn and Lead 5/16/2007Spherical Product Overview17 Spherical Roller Bearing (SRB) Product Overview Part B End of Module Close this window and return to the main menu