FAG Special Spherical Roller Bearings for Vibratory Machinery X-life quality
32Pages

FAG Special Spherical Roller Bearings X-life quality SCHAEFFLER GROUP

1 FAG spherical roller bearings for bearings in vibratory machinery 2 of FAG special spherical roller bearings 2 1.2.1 X life spherical roller bearings 223..-El-T41A(D) 2 1.2.2 X life spherical roller bearings 223.. El JPA T41A 2 1.3 Bearings with tapered bore 3 1.4 Bearings with coated bore 3 1.5.1 Tolerances for bearing bore and outside diameter 3 1.5.2 Radial internal clearance groups 4 1.5.3 Reduction in radial internal clearance of bearings with tapered bore 5 1.6 Permissible radial acceleration 6 2 Specification of bearing size 6 2.1 Two bearing screen with circle throw 6 2.2 Two...

FAG spherical roller bearings for vibratory stresses Operating conditions · Basic designs of FAG special spherical roller bearings 1 FAG spherical roller bearings for vibratory stresses 1.2 Basic designs of FAG special spherical roller bearings 1.1 Operating conditions for bearings in vibratory machinery FAG special spherical roller bearings for vibratory machinery have main dimensions corresponding to dimension series 23 (E DIN 616: 1995-01, ISO 15). For the particular stresses occurring in vibratory machinery, we manufacture all the special spherical roller bearings described in this...

FAG spherical roller bearings for vibratory stresses Bearings with tapered bore · Bearings with coated bore · Specification T41A(T41D) 1.3 Bearings with tapered bore In special cases such as saw frames, bearings are also available with a tapered bore (taper 1:12). The ordering designations are 223..-E1-K-T41A and 223..-E1-K-JPA-T41A with a bore diameter of Ն 160 mm. 1.4 Bearings with coated bore In order to reduce or prevent fretting corrosion between the bearing bore and the shaft, we can for specific orders supply spherical roller bearings with a cylindrical bore, coated with Durotect ®...

FAG spherical roller bearings for vibratory stresses Geometrical tolerances of bearing seating surfaces In order to achieve the required fit, the bearing seats and fit surfaces of the shaft and housing bore must conform to certain tolerances, see the following table. 3: Radial internal clearance of FAG spherical roller bearings 1.5.2 Radial internal clearance groups Specification T41A(D) prescribes C4 as the standard internal clearance group for all spherical roller bearings of vibrating screen design so it is not necessary to state this explicitly. Radial preloading of the bearings is thus...

FAG spherical roller bearings for vibratory stresses 1.5.3 Reduction in radial internal clearance of bearings with tapered bore Bearings with a tapered bore are mounted on a conical shaft seat or, using a sleeve, on a cylindrical shaft. The reduction in the radial internal clearance during mounting (see table, Figure 4) can be taken as an indication of the seating between the inner ring and 4: Reduction in radial internal clearance in mounting of spherical roller bearings with tapered bore (solid shaft) Nominal bore radial internal Control value for minimum radial internal clearance after...

FAG spherical roller bearings for vibratory stresses Specification of bearing size 1.6 Permissible radial acceleration Since the centrifugal forces are supported against the outer ring, high acceleration forces are possible in special spherical roller bearings for vibratory machinery, see diagram below. Permissible radial acceleration values of special spherical roller bearings (for dimension series 223 and 233) a) n · d m = 350 000 min –1 · mm Maximum possible values with optimum mounting conditions and oil lubrication, e. g. planetary gearbox b) n · d m = 140 000 min –1 · mm Normal...

Specification of bearing size Two bearing screen with circle throw If (2) is incorporated in (1) and the expression is transformed, the radial bearing load is Fr = 5: Schematic of two bearing screen with circle throw Example Weight of screen box G = 35 kN Vibration radius r = 0,003 m Speed n = 1 200 min –1 Number of bearings z = 2 Bearing load according to formula (1) Fr = The equivalent dynamic bearing load required in order to determine the necessary basic dynamic load rating of the bearing is then 6: The vibration radius is determined by the ratio of the screen box weight to the exciter...

Specification of bearing size Two bearing screen with straight line motion 2.2 Two bearing screen with straight line motion Perpendicular to the direction of vibration In principle, the exciter in a two bearing screen with straight line motion comprises two contrarotating synchronous circular throw systems, Figure 7. The forces are determined by resolving the rotating centrifugal force vectors of the imbalance shafts into two components, in the direction of the line connecting the two shafts and the direction perpendicular to this line. It can be seen that the components lying in the...

Specification of bearing size Two bearing screen with straight line motion 7: Schematic of two bearing screen with straight line motion

Specification of bearing size Eccentric screen 2.3 Eccentric screen In contrast to a two bearing screen, the vibration radius of an eccentric screen is a function of the eccentricity of the shaft. The bearing for the two inner rings is determined using the same formula as for the circle throw screen Fr = where r is the eccentric radius of the crankshaft and z is the number of inner bearings, Figure 8. The influence of the support springs on the loading of the inner bearings can be regarded as negligible. The outer bearings of the eccentric screen are only lightly loaded since the...

Specification of bearing size Nomogram for calculation of centrifugal force 2.4 Nomogram for calculation of centrifugal force of the imbalance masses or the centrifugal force of the screen box mass Fmax. Fmin and F are centrifugal forces centre of gravity of the exciter

Specification of bearing size Nomogram for calculation of basic load ratings 2.5 Nomogram for calculation of basic dynamic load rating required The following are required in order to calculate the basic dynamic load Lh Basic rating life [h] P Equivalent dynamic load [kN] In two bearing screens with circle throw and inner bearings with eccentric screens In two bearing screens with straight line motion where 1,2 is the safety factor F is the centrifugal force accord-