Abstract
Slewing bearings are selected based on the characteristics of capacity, which determine the area of the permissible load of the bearing. This capacity of a bearing does not take into account the real operating conditions of a bearing. This implies a necessity to take into consideration all the factors having an influence on the bearing capacity during its determination. The way of determining of the static limiting load curves profiles (static capacity chart) of a double-row roller/ball combination slewing bearing is presented in this article. In the calculations, taking into account flexural-torsional 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, is presented in the paper. Concluding results have been obtained in numerical way. Distribution of internal load, which is in individual rows of a bearing, is presented here. Basic problems of modelling the component unit of the slewing bearing are discussed. In calculating the profile, the initial clamp of the fixing bolt, flexible rings, flexible casing and variation of the contact angle bearing are allowed for. Particular attention is paid to modelling of elements that are equivalent for balls bearing. Obtained results are presented as graphs.
Highlights
Two groups of problems can be distinguished during the model building: bearing modelling on a macro scale, it means modelling bearing rings and their mounting and modelling bearing on a local scale, it means modelling phenomena in the contact zone of rolling elements and bearing raceways
An increase in the load capacity is observed in the DE range, which is caused by the higher contribution of the load capacity of the supporting row until it reaches the value at point E, where the rolling parts, present in the bearing node BB, reach the permissible load F1lim
The analytical methods are reduced for the bearing computations by the assumption of the non-deformability of the bearing rings
Summary
The rotation mechanisms of lifting devices are usually constructed with the use of slewing roller bearings. The slewing bearing load capacity usually limits the maximum external loads of the designed machine and the correct estimation of it is an important part of the working machine calculation. Slewing bearings are usually selected for extreme loads, so that their work is at the limit of endurance This requires careful and precise calculations of their performance parameters, of which still the most important is the static load capacity, more and more often supplemented by additional criteria like assembly, durability, determination of movement resistance etc. The static capacity is determined based on the strength criterion in the contact zone of the rolling elements and the bearing raceways. The double-row slewing rings roller/ball combination bearings (Figure 3) are aimed for applications with small eccentricities at relatively high axial loads, which call for a long service life, even with continuous oscillating motions, and where the structural.
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