Load distribution and friction torque in four-point contact slewing bearings considering manufacturing errors and ring flexibility

Heras, Iñaki; Aguirrebeitia, Josu; Abasolo, Mikel; Coria, Ibai; Escanciano, Iñigo

doi:10.1016/j.mechmachtheory.2019.03.008

Cited by 26 publications

(21 citation statements)

References 19 publications

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“…This is likely due to manufacturing fluctuations that cause a difference in negative clearance between the otherwise identical bearings, and similar behavior has been shown by Chen et al [9]. The effect of this discrepancy diminishes as external loads increase, which supports simulations performed by Heras et al [7], who observed that manufacturing errors have a decreasing effect on the internal load distribution for increased external loads. At low contact pressures under 2 GPa, a drop in the torque was observed for increased external loads.…”

Section: Discussionsupporting

confidence: 83%

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Measurements and modeling of friction torque of wind turbine blade bearings

Menck

Behnke

Stammler

et al. 2022

J. Phys.: Conf. Ser.

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The friction torque of rotor blade bearings is a required parameter for the design of pitch actuators and may provide information about continued degradation and impending failure of the bearing. The torque is heavily influenced by the operating conditions and external loads acting on the bearing. Test results for real-size bearings under realistic loads are rare. This paper presents test results of various double-row four-point bearings of three different diameters, ranging from 0.7m up to 5m. They are loaded with bending moments and axial loads, and their behavior at different speeds is compared. For the same bearing type, large differences are observed at zero load that decrease for higher loads. At lower contact pressures, the change from four-point into two-point contact is clearly visible and results in a temporary decrease of the torque. To monitor potential degradation of the bearing, an empirical model that can be fit to a particular bearing is proposed.

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Section: Discussionsupporting

confidence: 83%

“…Other friction torque models can be found e.g. in [2] [7], where the authors construct a detailed contact model of bearings and predict bearing torque based on simulated contact stresses.…”

Section: Introductionmentioning

confidence: 99%

Measurements and modeling of friction torque of wind turbine blade bearings

Menck

Behnke

Stammler

et al. 2022

J. Phys.: Conf. Ser.

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show abstract

“…Some researchers paid attention to the influence of machining error of slewing bearing on the load carrying capacity. Heras et al [12,13]proposed a method for calculating the load distribution in a single-row four-point contact ball slewing bearing considering ball preload, manufacturing errors and ring flexibility. The mechanical model was built by the formulation and minimization of the potential energy of the bearing for considering the ring deformations.…”

Section: Introductionmentioning

confidence: 99%

Calculation method of static carrying curve for double-row different-diameter ball slewing bearing

Wang²,

2022

Preprint

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The calculation method of the static carrying curve of the double-row different-diameter ball slewing bearing was proposed. The relationship between the internal maximum rolling element load of each row and the external load combination of the slewing bearing was established by using the deformation compatibility conditions and the force equilibrium conditions. Using the rolling element load distribution range parameter of the main raceway and the auxiliary raceway of the double-row different-diameter ball slewing bearing respectively as input invariable, the corresponding external load combinations of axial load and tilting moment load of the slewing bearing were obtained. These external load combinations were plotted in the coordinate system to obtain the static carrying curve of the slewing bearing. The obtained static carrying curve was compared with that calculated by the finite element method for the verification purpose. Finally, influence laws of the detailed design parameters, such as raceway groove radius coefficient, raceway contact angle and rolling element diameter on the carrying capacity of the double-row different-diameter ball slewing bearing were analyzed by using the carrying curves. The results show that decreasing of raceway groove radius coefficient, increasing of rolling element diameter or increasing of raceway contact angle appropriately is advantageous for enhancing the carrying capacity of the double-row different-diameter ball slewing bearing.

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“…These elements enable the machine body to move relative to the undercarriage in bucket-wheel excavators, stackers, stacker-reclaimers, draglines, cranes and also in wind turbines. Due to the large size of these machines, their slewing bearings are subjected to high loadings [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Method for Monitoring the Technical Condition of Large-Scale Bearing Nodes in the Bodies of Machines Operating for Extended Periods of Time

Sokolski

Smolnicki

2021

Energies

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Failure of systems applied in machines comprising rolling and slewing bearings usually causes downtime of the entire heavy machine. The problem of failures can be aggravated by extremely difficult operating conditions, such as significant loads or a harsh environment. The entire issue inspired us to develop a method of monitoring the condition of such units. A study was carried out for six different large-scale excavators which examined strain distributions in the tested subassemblies. In order to estimate the technical condition of wheeled bogies, we used the phenomenon of strain propagation caused by the concentrated force acting in the ring girder web. Flamant theory was utilized to describe this phenomenon. Measurements were performed using strain gauges and the obtained results were compared with the FEM model. To determine whether bearing joints were in a good or bad condition, a coefficient of variation and an impulse factor were introduced as diagnostic indicators. It turned out that by evaluating these indicators, it was possible to distinguish between these two conditions. The method was successfully validated on machines that are in operation.

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Load distribution and friction torque in four-point contact slewing bearings considering manufacturing errors and ring flexibility

Cited by 26 publications

References 19 publications

Measurements and modeling of friction torque of wind turbine blade bearings

Measurements and modeling of friction torque of wind turbine blade bearings

Calculation method of static carrying curve for double-row different-diameter ball slewing bearing

A Method for Monitoring the Technical Condition of Large-Scale Bearing Nodes in the Bodies of Machines Operating for Extended Periods of Time

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