General Static Load Capacity In Four Contact
Point Slewing Bearings
Author(s)
J. Aguirrebeitia, R. Avilés, I. F. de Bustos & M. Abasolo
Abstract
This work tries to represent the general static load-carrying capacity of fourcontact-
point slewing bearings under general loading. This representation is
based on a generalization of Sjoväll and Rumbarger’s equations and provides an
acceptance surface in the load space. This acceptance surface provides the key
set of acceptance curves for the design and selection of bearings.
Keywords: four contact point slewing bearing, acceptance surface, bearing
selection, static load capacity.
1 Introduction
Slewing bearings are large-sized bearings with many applications, such as in
wind turbine generators, tower cranes vertical lathe tables... The loads acting on
these bearings usually contain axial and radial forces, as well as tilting moments
(see Figure 1). In the most unfavourable load case, the radial force is
perpendicular to the resultant of the tilting moments. Several bearing
manufacturers provide acceptance curves that allow one to determine whether or
not a bearing is acceptable for a given equivalent load, calculated as a
combination of the axial and radial loads. By means of a moment–axial-force
diagram, this equivalent load allows a designer to obtain the maximum allowable
tilting moment that the bearing can bear. This is illustrated in Figure 2. There are
some variations in the form and limits of the diagram shown in Figure 2.
depending on the manufacturers having experimented with or assessed the
bearings themselves, or having simply copied other manufacturers’ data.
Anyhow, there is always a certain ambiguity and a lack of a clear criterion in the
Keywords
four contact point slewing bearing, acceptance surface, bearingselection, static load capacity
Related Book
Other papers in this volume
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