Abstract: Six-row roller slewing bearing is the key component of kiloton class whole ground crane, the host machine has very high reliability requirements for this slewing bearing. Reasonable design and correct selection of slewing bearing are established on the basis of systemic mechanics analysis of it. By using the deformation coordination condition and force equilibrium condition as the slewing bearing undertaking combined loads, the mechanics model of six-row roller slewing bearing used in kiloton class whole ground crane is established, and the correctness of the established mechanics model is verified by comparing its results with the calculated results of finite element model. The results show that: the loads of the two upper row of rollers in the bearing are significantly greater than that of the two lower row of rollers. With the increase of axial clearance of slewing bearing, the number of rollers undertaking the external load decreases gradually inside the slewing bearing, the load of the heaviest loaded rollers increases correspondingly, this trend is more distinct during the early stage of clearance increase. During the process of the axial clearance increase of the slewing bearing from 0 mm to 0.28 mm, the carrying capacity safety factor of the slewing bearing decreases quickly first, then decreases slowly. The safety factor of the slewing bearing is 2.66 when the axial clearance is 0 mm, however, as the axial clearance increases to 0.28 mm, the safety factor of the slewing bearing decreases by 42 percent.

Key words: finite element analysis, safety factor, six-row roller, slewing bearing, statics model