Internal-toothed slewing ring SIR series

4-point contact ball bearingfour-point contactdouble-row

Four point contact ball slewing rings（bearing）is one type of separated bearings which mean that one bearing can withstand axial force in both directions. The section of the raceway is peacch.When the bearing is unloaded or in pure radial load， there are four contact points between balls and rings. That is why it is called four point contact ball slewing bearing. When it bearings pure axial load， there are two contact points between balls and raceway,therefore, It can withstand axial force in both sides. Moreover， Four point contact ball slewing bearings can support moment load which make them with the performance of single low angular contact bearing and double row one. The bearing are suitable for situations where two contact points exist when pure load or larger axial load is applied or high speed field.