Load carrying capacity and life

Static load carrying capacity

The size of the slewing ring required is dependent on the demands made on its: Checking the static load carrying capacity The static load carrying capacity can be checked in approximate terms only when: â–  static and dynamic load carrying capacity ( Dynamicloadcarrying capacity see page16) â–  the load arrangement is in accordance with Figure3 (page15) â–  life (see Dynamic load carrying capacity and life ,page16) â–  operational reliability. â–  all the requirements stated in this publication are fulfilled in relation to–flange rings and location–fitting, lubrication and sealing. Where load arrangements are more complex or the conditions are not fulfilled, please consult INA.In order to check the static load carrying capacity, the following equivalent static operating values must be determined: Definition of static load carrying capacity Slewing rings that undergo rotary motion only infrequently, undergo slow swivel motion, rotate only slowly or are subjected to load while stationary are dimensioned on the basis of their static load carrying capacity since the permissible load in these cases is determined not by material fatigue but by the load-induced deformations at the contact points between the rolling elements and raceways.The static load carrying capacity is described by: â–  the basic static load ratings C â–  the equivalent static bearing load F
0q â–  the equivalent static tilting moment load M
0q .Checking is possible for applications with or without radial load.
(see dimension tables ) â–  the static limiting load diagrams Raceway and Fixing screws (see dimension tables and calculation example, page15).The size of a statically loaded slewing ring for a particular application can therefore be checked in approximate terms using the basic static load ratings C Determining the equivalent static bearing load without radial load and checking the static load carrying capacity in the static limiting load diagram Raceway If only axial and tilting moment loads are present, the following apply:
and the static limiting load diagrams Raceway . F
0q F
0a â‹…â‹… f
A f
S M
0q M
0k â‹…â‹… f
A f
S F 0q kNEquivalent static axial bearing loadF 0a kNStatic axial bearing loadf A –Application factor (see Table1, page14)f S –Factor for additional safetyM 0q kNmEquivalent static tilting moment loadM 0k kNmStatic tilting moment load. â–  Using the values for F
0q and M
0q , determine the load point in the static limiting load diagram Raceway .The load point must be below the raceway curve.In addition to the raceway, check the dimensioning of the fixing screws as well (see Calculation example , page15 and Fixing screws , page20). 12