fig . The choice between the NU and N designs should take arrangement design and mounting procedures into consideration.N design bearings arepreferred for high-speed applications or where idling under very light loads isto be expected.In most applications cylindrical rollerbearings with a cylindrical bore are used. Bearings with a tapered bore are required for a limited number of applications.The matrix provides an overview ofthe suitability of the different cylindrical roller bearing standard designs for given application conditions. Bearing arrangement Because of their design characteris- tics, SKF cylindrical roller bearings are particularly suitable for bearing arrangements • that have to accommodate heavyradial loads and sometimes also axial loads while operating at high speeds, and• where there is a need to have inter-ference fits on the shaft as well as in the housing. Bearings with a flangeless inner orouter ring can accommodate axial displacements of the shaft as a result of thermal expansion. As axial dis- placement takes place within the bear- ing rather than between the bearing and shaft or housing bore, there is practically no increase in friction as the bearing rotates. Eliminating the axial interaction between the locating and the non-locating bearing means that stresses are low, temperature is minimized and maximum service life is achieved. A typical arrangementwith a cylindrical roller bearing at the non-locating side is shown in

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Product information

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Recommendations

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Product data Page ............. 3 Application advice Page ............. 24 When designing a bearing arrange-ment it is not just a question of select- ing a suitable bearing and determining its size – a number of other factors have to be taken into account: type and quantity of lubricant, bearing fits and bearing clearance, design of associated components, selection of seals etc. Each individual decision influences the subsequent perform- ance, reliability and economy of the bearing arrangement. To design a bearing arrangementthus calls for some considerable ex- perience as well as knowledge of mechanics. If this is available, the information contained in the SKF General Catalogue or the SKF Inter- active Engineering Catalogue, available on CD-ROM or online at www.skf.com, should be adequate. If not, please con- tact the SKF application engineering service for assistance.Here, the characteristicsof SKFcylindrical roller bearings and their suitability for various application demands are presented.

Design of bearing arrangements

1 Fig 1 NU type cylindrical roller bearing as non-locating bearing on a gear shaft 18