Abstract: The use of slewing bearing on an articulated rubber-tyred vehicle can induce horizontal rotate between front and rear frame, make four wheel touchdown, and improve attachment condition of wheels for formidable work environment of underground coal mining. In the article, firstly, horizontal rotate structure of slewing bearing is presented, secondly, basing on theoretical mechanics and associating work condition, the force of whole vehicle and rear frame are analyzed individually, axial load and overturning moment of the slewing bearing are calculated, finally, specification of the slewing bearing product is defined according to the bearing capacity curve.

Key words: slewing bearing, horizontal rotate, axial load, overturning moment