SKF Cooper split roller bearings and bearing units
Size selection based on axial load for split cylindrical bearings Selecting a bearing based on the axial load is considered independently from the radial load. With the speed and desired shaft size known, the axial load rating can be calcu- lated from C a > f da f dn P a / f b where C a = axial load [kN] f da = dynamic or service factor = 1, for peak overload periods = 1,1 to 1, 2, for general running f dn = factor for axial load ( diagram 1 ) f b = bearing factor P a = equivalent axial load [kN] Value for bearing factor f b depends on bear- ing series and calculated values for f dn accordingly: • For 01/01E, 02 and 03 series where 0,25 ≤ dn [mm] / 1000 < 63, f b = 1 • For 01/01E, 02 and 03 series where 63 ≤ dn [mm] / 1000 ≤ 300, f b = 1,25 • For 100 series where 0,25 ≤ dn [mm] / 1000 < 240, f b = 1 • For 100 series with f dn < 240 please contact SKF Retaining rings or recessed journals are required when: • P a > 0,2 C a , for 100 series split cylindrical roller bearings • P a > 0,25 C a , for 01E and 02E series split cylindrical roller bearings • P a > 0,5 C a , for 01, 02, and 03 series split cylindrical roller bearings For additional information about retaining rings and recessed shafts, see Axial location of bearings on page 15 . If the axial load exceeds 40% of the radial load, contact SKF. The axial load carrying capacity is decreased by 50% if the lubricant does not have EP (extreme pressure) additives. Load carrying capacity of bearing in pairs The split tapered roller bearings are all sup- plied as double row bearings and the capaci- ties quoted in this publication are for double row bearings. For design and mounting of other bearing pairs, please contact SKF for more informa- tion and support. Requisite minimum load In applications where the bearing size is determined by factors other than load – for example, shaft diameter constrained by crit- ical speed – the bearing may be lightly loaded in relation to its size and carrying capacity. Where there are very light loads, failure mechanisms other than fatigue, such as skidding and smearing of raceways or cage damage, often prevail. In order to provide satisfactory operation, SKF Cooper split roller bearings must always be subjected to a given minimum load. Addi- tional information under Loads ( page 72 for split cylindrical roller bearings and page 103 for split tapered roller bearings). Bearing size Bearing factor (fb) Diagram 1 Factor for axial load 1) Speed factor d n = bearing bore [mm] x rotational speed [r/min] 5 0,57 0,6 0,7 0,8 0,9 1,0 1,2 1,5 1,7 2,0 2,5 3,0 3,5 4,0 4,5 10 20 30 50 100 200 300 500 1 000 2 000 3 000 4 000 6 000 0,5 1 2 3 5 10 20 30 50 100 200 250 1,0 1,3 1,5 1,7 2,0 2,5 3,0 4,0 5,0 6,0 1 1 1.25 1.25 1 * n/a * 0,25 1,0 2 3 6 8 10 20 30 40 50 60 80 100 150 200 300 400 1,8 1,4 1,2 1,0 0,9 1,0 1,5 2 3 4 5 6 7 8 9 10 11 12 f n f l f dn 100 01/01E 02, 03 d n [mm] 1 000 hours 1 000 13 1
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