RKB TAPER ROLLER BEARINGS ASSY RKB Executive Headquarters and Technological Center - BALERNA (SWITZERLAND) Engineered in Switzerland Technological Bearings

RKB taper roller bearings assy

RKB taper roller bearings assy: designation system Taper roller bearings assy code Configuration Inches RKB internal system Suffix Basic code Metric European system Example: TDO 081406/508750 AAHA1ZBBT2B K1453015

RKB taper roller bearings assy: designs TDO TQO TQOS/AVS1 TDOM TQO/G TQOS/AVS2 TDONAZ TQO/EG TDI TQO pierced rollers TQOS/AVS2/1 TQI TDIS SET/TDI TQIT

RKB taper roller bearings assy: inches basic code internal system Inches basic code: XX YY ZZ / AA BB CC ... Suffix … KDDD EE FF D,DD d = XX,CC inch K factor = T = ZZ,BB inch r3,4 = F,F mm D = YY,AA inch r1,2 = E,E mm Example: TDI 081407/127562 A1AZBBT2BK1761564 d = 8,62 inch = 218,95 mm D = 14,12 inch = 358,65 mm T = 7,75 inch = 196,85 mm K factor = 1,76 r1,2 = 1,5 mm r3,4 = 6,4 mm TDI main dimensions

RKB taper roller bearings assy: suffix system The RKB suffix system for multi-row taper roller bearings is composed of two different parts: • Bearing version (corresponding to different executions) • Bearing features Version Features AA AA1 AB AA2 AC AA3 … … … … … … … … HA1÷4 = case-hardened steel HB1÷3 = bainite treatment PT1÷4 = phosphate treatment ZB = ZB rollers profile VL = Victory Line (RKB premium brand) BT2B = double-row taper roller bearing BT4B = four-row taper roller bearing Example: TDI 081407/127562 A1AZBBT2B K1761564 1. 2. 3. 4. Inner and outer rings Outer ring Inner ring Inner...

RKB taper roller bearings assy: B.E.P. and M.E.P. definitions All of the multi-row taper roller bearings manufactured by RKB are supplied correctly assembled, with the axial internal clearance (B.E.P. - Bench End Play) required. Usually the correct B.E.P. range is obtained by RKB adjusting the width of the spacers between cones and cups, but in some designs, with no spacers between cones and cups, the B.E.P. is preadjusted by RKB. When the bearing is mounted on the shaft and in the housing with interference fit, the axial internal clearance is reduced. The remaining axial internal clearance after...

RKB taper roller bearings assy: B.E.P. in Technical Fiches RKB supplies the B.E.P. value in its Technical Fiches and Q.C.C.D.S. (if available): . .

RKB taper roller bearings assy: B.E.P. in Q.C.C.D.S.

RKB taper roller bearings assy: from B.E.P. to R.I.C. The Technical Fiches provided by RKB supply all the information necessary to calculate the radial internal clearance (R.I.C.) of the bearing starting from the B.E.P. and the e values: R.I.C. = B.E.P. scheme of a TDI B.E.P. * e 1,5 B.E.P. = 0,350 / 0,400mm e = 0,39 0,39 R.I.C min = 0,350 * = 0,091mm 1,5 0,39 R.I.C max = 0,400 * = 0,104 mm 1,5 R.I.C. = 0,091/0,10 4mm

RKB double-row taper roller bearings: bearing selection The RKB double-row taper roller bearings are available in two different arrangements: • Face-to-face (TDI) • Back-to-back (TDO) In the TDI configuration the load lines are converging as the axis of rotation is approached. This arrangement doesn’t increase the stiffness of the assembly and the bearing cannot support overturning moments. Reversely, in the TDO configuration, the contact angle is diverging as the axis of rotation is approached, increasing the stiffness of the assembly. This type of arrangement is suitable to resist overturning...

TDO design The RKB TDO configuration consists of a double-row taper roller bearing composed of two single cones, one double cup, two pressed steel cages, two rows of back-to-back rollers and one cone spacer (plain or with annular groove and lubrication holes). The width of the cone spacer permits to obtain the correct B.E.P. The TDO bearings with a blind hole in the double cup are particularly suitable to be mounted with a loose fit in the housing, due to the hole counter bored that allows the insertion of a pin to avoid sliding between the double cup and the housing.

TDOM design The RKB TDOM configuration consists of a double-row taper roller bearing composed of two single cones, one double cup, two machined brass cages, two rows of back-to-back rollers and one cone spacer (with annular groove and lubrication holes). The width of the cone spacer permits to obtain the correct B.E.P. The TDOM bearings with a blind hole in the double cup are designed to be mounted with a loose fit in the housing due to the hole counter bored that allows the insertion of a pin to avoid sliding between the double cup and the housing.

TDONAZ design The RKB TDONAZ configuration consists of a double-row taper roller bearing composed of two single cones, one double cup, two pressed steel cages, two rows of back-to-back rollers and two pressed steel shields. There are no spacers and the bearing is supplied with the correct B.E.P.

RKB double-row taper roller bearings: example of Technical Fiche .

RKB double-row taper roller bearings: product samples RKB TDO bearing RKB TDO bearing

TDI design The RKB TDI configuration consists of a double-row taper roller bearing composed of two single cups, one double cone, two pressed steel cages, two rows of face-to-face rollers and one cup spacer. The width of the cup spacer permits to obtain the correct B.E.P.

TDIS design The RKB TDIS configuration is a double-row taper roller bearing composed of two single cups, one double cone, two pressed steel cages and two rows of face-to-face rollers. Compared to TDI, TDIS configuration has a B.E.P. equal to zero due to the lacking of a spacer between the two cups and a higher contact angle to increase the axial load capability of the bearing. This type of bearing is usually mounted with a loose fit on the shaft. For this reason, RKB produces this type of bearing with one or two keyway slots (red circle) in the bore or with one semicircular locating axial groove...

RKB double-row taper roller bearings: example of Technical Fiche .