Abstract
Abstract In this paper, the mechanical models of large-scale double row slewing ball bearing considering combined loading conditions were presented based on the rigid rings and flexible rings, respectively. And the contact properties between the ball and raceway were studied. These workflows for the calculation were described and programmed by MATLAB. The load distributions of slewing bearing for 2MW wind turbine were presented. The results indicated that the load distribution with the ideal stiff assumption differs from the load distribution determined by taking into account the flexibility of rings. With flexible rings, the magnitude of contact force is less than that of the rigid rings. The influences of the initial contact angle, the coefficient of groove curvature radius, the clearance on maximum contact force were analyzed and some suggestions have been discussed. These parameters have significant effects on the load distribution. The maximum contact force decreases with coefficient of groove curvature radius decrease. A three dimensional finite element model of the slewing bearing is established and analyzed. The simulated results are compared with that of mechanical models.
Highlights
In this paper, the mechanical models of largescale double row slewing ball bearing considering combined loading conditions were presented based on the rigid rings and flexible rings, respectively
The maximum contact force decreases with coefficient of groove curvature radius decrease
It can be seen that when the values of angular position are 0∘–86.5∘ and 279∘–360∘, the balls come in contact with the raceways at two points connecting the centers of curvature of contact pair 1 and the centers of curvature of contact pair 3, respectively
Summary
Abstract: In this paper, the mechanical models of largescale double row slewing ball bearing considering combined loading conditions were presented based on the rigid rings and flexible rings, respectively. Göncz et al [8] presented a method to study the contact force distribution for a threerow roller slewing bearing considering the flexible rings and clearances. Based on the assumption of rigid ring, Wang and Yuan [12] calculated the contact load of each rolling element by giving different negative clearance of the double row four point bearing. The computational models of double row slewing ball bearing under combined load conditions were proposed based on the rigid rings and flexible rings, respectively. At any section of slewing bearings position angle φ (0 ≤ φ ≤ 2π), the distances between diagonally opposed centers of curvature along the direction of contact pairs are defined as Sφm (m = 1, 2, 3, 4):. Considering the aforementioned definitions ,according to the contact force and the radial force, the radial deformation of the inner ring is defined as [14]:
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