The Screw Fastening Order in Slewing Rings

Abstract

The slewing rings are composed of two rings, an inner one and an outer one, in which raceways are obtained that, contains the rolling elements on which the working loads are transmitted from the moving ring to the fixed one. The rings can be produced un-geared as well as with internal or external gear. Then the slewing ring is fitted with grease nipple and seals for the lubricant. The forces on the rings and the safety of the slewing rings are strictly related to the quality of the bolts. Correct fastening orders applied to the screw enssure a uniform distribution of the contact pressure between the fastened bodies. This paper presents some numerical results concerning the “diagonal” and “star shape” patterns.