General static load capacity in four contact point slewing bearings

Abstract

This work tries to represent the general static load-carrying capacity of fourcontact-point slewing bearings under general loading. This representation is based on a generalization of Sjoväll and Rumbarger's equations and provides an acceptance surface in the load space. This acceptance surface provides the key set of acceptance curves for the design and selection of bearings.

Influence of the geometrical design on ball and crossed roller wire race bearing behavior under axial load

“…While boundary conditions usually depend on the application or the surrounding structures, this work pretends to be generalistic and aims to study the local behaviour of the component. In this sense, rigid boundary conditions were imposed to the external faces of the rings and a external axial displacement was applied to those faces to reach the static load carrying capacity provided by the methodology developed in [16] for ball bearings and in [17] for roller bearings. Symmetry boundary conditions were also applied to the cyclic symmetric faces.…”

“…-Axial static load capacity (C0a). The axial static load capacity can be analytically obtained [16,17] and retrieves the maximum axial load that the contact between rolling element and raceway can bear until a permanent deformation of one 10,000 th of the rolling element diameter arises, according to ISO-76 [18]; in that standard, the maximum allowable force is the one that generates a contact pressure of 4200 [MPa] for ball bearings and 4000 [MPa] for roller barings, calculated with Hertz's elastic contact theory. Although this way for defining the capacity of a bearing to face external loads may be insufficient for some applications and operating modes (it does not account for fatigue, core crushing and other damage sources), it can be perfectly used as a load capacity indicator with comparative purposes.…”

Determination of the precise static load-carrying capacity of pitch bearings based on static models considering clearance

“…Aguirrebeitia [2][3][4] presented the derivation of the general static load-capacity of three-row roller slewing bearings and four-contact point slewing bearings, based on Rumbarger's method. Their calculations assume zero clearance in the contact and rigid rings.…”

Static load-carrying capacity and fatigue life of a double row pitch bearing with radial interference

“…While there was much discussion on the single row four-point contact ball bearing in the professional literatures [1][2][3][4][5][6][7][8][9] the research on the large-sized double or three row four-point contact ball bearings was hardly seen. [10][11][12][13] A calculation procedure for determining the load distribution in the rolling elements of a four contact-point slewing bearing with one row of balls was discussed in Amasorrain et al 2 The motion of the ball and sliding friction in double arched ball bearing was analyzed in Alexandre and Daniel.…”

“…[10][11][12][13] A calculation procedure for determining the load distribution in the rolling elements of a four contact-point slewing bearing with one row of balls was discussed in Amasorrain et al 2 The motion of the ball and sliding friction in double arched ball bearing was analyzed in Alexandre and Daniel. 3 The calculation method of static loadcarrying curve for the turntable bearings has been discussed in Aguirrebeitia et al 5,6 A computational model for determining the static load capacity and fatigue lifetime of a large slewing bearing was described in Glodezˇet al 9 A method of computing the catalogue capacity of a slewing bearing was presented in Kania et al 14 In Kania et al, the flexuraltorsional flexibility of bearing rings, flexibility and number of bearing clamping bolts, and the most important parameters of the contact zone of rolling elements with bearing raceways under positive or zero clearance were considered. A computational model for the fatigue life determination of a three-row roller slewing bearing was described in Goncz et al 12 All the papers mentioned above described the static model without taking into account the clearance of bearing especially the negative clearance or radial interference.…”