FKL Roller Bearings for Consistent Performances


FKL manufactures a wide assortment of roller and ball bearings for various applications. Effort is consistently made towards reducing production downtime and increasing profitability through greater productivity. FKL split roller bearings are one such solution, suitable for applications, where mounting and dismounting process of a bearing leads to loss in productivity or is extremely time consuming. FKL manufactures split cylindrical roller bearing up to 600 mm bore diameter and split spherical roller bearings up to 1120 mm bore diameter. The use of cross-split bearings turns to advantage namely in conditions where axial installation of a bearing becomes impossible. This relates to multiple-bearing shafts, crankshafts, long transmission shafting or for events where bearing installation would be exceedingly time consuming and a longer machinery downtime would cause great operational losses.

The mostly used cross-split bearings worldwide are single row cylindrical and double row spherical roller bearings. The parts of these bearings (outer ring, inner ring as well as the cage for centering the rolling elements) are split in radial sense. Most cages are constructed in brass. Connection of two halves of cage is made in a manner to withstand dynamic loads exerted on it during operation. The two halves of inner ring are positioned on the shaft by means of locating rings provided with threaded joint secured against loosening. The dividing joint between the outer ring halves can be vertical to ring face, while the inner ring dividing level is designed inclined at an angle to eliminate shocks in rolling of elements at loaded area of split surface edge.

Pros of Using Split Bearings:
Sometimes when trying to minimize equipment downtime, an engineer trades one design problem for yet another design problem. The engineer will determine which design minimizes equipment downtime and gives the highest extent of reliability. When the fan bearings needs to be replaced on an overhung fan, the hassle of removing the coupling hub and then trying to pull the failed bearings off of the fan shaft are faced. Worse yet, if the coupling does not have a spacer it means that the motor has to be moved in order to make clearance so that the coupling hub can be removed off of the shaft. Hence, the split bearing minimizes repair turnaround time. Instead of having to pull the coupling hub off of the shaft and maybe moving the motor, one only has to pop the bearing cover off of the bad bearing and slip the failed components out of the bearing, much like popping the sleeves out of a pillow block sleeve bearing. Everything is split into two, the inner and outer races, the ball cage, and the liner inserts. The inner raceway is held together onto the shaft by means of collars that are bolted together. The collars and the inner raceways are shorter in circumference than the shaft.There is a very small hairline distance between the two races that allow the collars to snug the races onto the shaft when the collars are drawn together by bolts. The roller cages are held together with a simple clip.

Cost savings :
Due in particular to the reduced downtime, the fitting of split spherical roller bearings gives a significant reduction in fitting costs, as shown in the diagram. In new designs too, split spherical roller bearings can give cost savings in many cases since the plant can be simplified and the assembly work required is reduced.

Mounting of Bearings:
For mounting of bearings with split rings we anticipate use of fit to shaft in h6, h7, h9 values. Shape allowances of seating surfaces can be used up to 50% of fitting tolerance, generally the seating surfaces accuracy is required to be in IT6. Before installing bearings in seating we recommend to finely smear the seating surfaces by mounting paste to minimize occurrence of contact corrosion. It is advisable to appoint skilled and purpose-trained personnel to bearing mounting.

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