Influence of the cage on the friction torque in low loaded thrust ball bearings operating in lubricated conditions

Olaru, Dumitru; Bălan, Mihaela Rodica D.; Tufescu, A; Cârlescu, Vlad; Prisăcaru, Gheorghe

doi:10.1016/j.triboint.2016.11.042

Cited by 22 publications

(6 citation statements)

References 13 publications

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“…Houpert et al [ 52 ] found that cage–ball friction can cause bearings to produce an additional braking effect. Dumitru et al [ 53 ] noted that the cage–ball friction is a crucial friction source in extremely low axial force conditions. Under high-speed and low-load conditions, rolling bearings often experience skidding, which can cause friction and incipient failure to the bearing ring and rolling element surfaces [ 54 ].…”

Section: Dynamic Modeling Of Cage–ball Friction Fault For Lightly Loa...mentioning

confidence: 99%

Simulation of Friction Fault of Lightly Loaded Flywheel Bearing Cage and Its Fault Characteristics

Chen

Deng

Wang³

et al. 2022

Sensors

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Because of the operating environment and load, the main fault form of flywheel bearing is the friction fault between the cage and the rolling elements, which often lead to an increase in the friction torque of the bearing and even to the failure of the flywheel. However, due to the complex mechanism of the friction fault, the characteristic frequencies often used to indicate cage failure are not obvious, which makes it difficult to monitor and quantitatively judge such faults. Therefore, this paper studies the mechanism of the friction fault of the flywheel bearing cage and establishes its fault feature identification method. Firstly, the basic dynamic model of the bearing is established in this paper, and the friction between the cage and the rolling elements is simulated by the variable stiffness. The influence law of the bearing vibration response reveals the relationship between the periodic fluctuation of cage-rolling element friction failure and the bearing load. After analyzing the envelope spectrum of the vibration data, it was found that when a friction fault occurred between the cage and the rolling element, the rotation frequency component of the cage modulated the rotational frequency component of the rolling element, that is, the side frequency components appeared on both sides of the characteristic frequency of the rolling element (with the characteristic frequency of the cage as the interval). In addition, the modulation frequency components of the cage and rolling element changed with the severity of the fault. Then, a modulation sideband ratio method based on envelope spectrum was proposed to qualitatively diagnose the severity of the cage-rolling element friction faults. Finally, the effectiveness of the presented method was verified by experiments.

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Section: Dynamic Modeling Of Cage–ball Friction Fault For Lightly Loa...mentioning

confidence: 99%

Simulation of Friction Fault of Lightly Loaded Flywheel Bearing Cage and Its Fault Characteristics

Chen

Deng

Wang³

et al. 2022

Sensors

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“…From the various influencing factors of the control strategy (e.g. weather condition, turbine location, turbine dimension, operating intensity, lubricant requirements, lubricant degradation, and previous lubrication effect) [17][18][19], the factors with relatively high influence were selected for adjustment. Finally, the final control strategy was prepared and implemented according to the actual operating data.…”

Section: Control Strategymentioning

confidence: 99%

Wind Turbine Lubrication Based on Parallel Control of Multiple Factors

Xiao-pin¹,

Liu²,

Kou³

et al. 2020

JESA

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The lubrication needs of wind turbines vary with the operating conditions. To provide a dynamic lubrication scheme for wind turbines under variable conditions, this paper designs a dynamically adjustable lubrication scheme through parallel control of multiple influencing factors. Based on mid- and long-term loads, the proposed scheme fully considers the influence of various sudden changes in addition to slowly changing factors like load, operating hours, and speed, such as to dynamically adjust the injection flow as per the specific operating condition of the turbine. The ideal lubrication effect was tracked through the adjustment of the injection flow or injection time, and used to determine the optimal dynamic lubrication control strategy during turbine operation. The proposed control strategy overcomes the defects of the traditional fixed-time fixed-flow lubrication approach, and provides reasonable on-demand lubrication schemes for wind turbines in different operating conditions. The on-demand injection of lubricant prevents under- or over-lubrication, reduces the rate of mechanical failure, and extends the service life of wind turbines. Suffice it to say that the proposed control strategy can lower power generation cost and save energy, making wind turbines more profitable.

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“…Even nowadays, it is still not possible to reliably predict grease behaviour in the bearing contacts as greases have complex (non-Newtonian, thixotropic) rheology. Experimental studies published on grease lubrication were performed mainly on ball-on-disc simulators [4][5][6][7][8][9] while there is only a few papers involving full-scale bearing simulators [10][11][12][13] which were focused principally on resulting bearing torque not on film thickness formed in bearing contacts.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Film Thickness of Grease-Lubricated Thrust Bearing: From Ball-on-Disc to Bearing

Fryza¹,

Kroup²,

Šperka³

et al. 2019

PES

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Rolling element bearings lubricated by greases represent the most used mechanical components in industry, thus the total volume of energy required to overcome their friction is enormous. Even small improvements can provide considerable savings. To reach these improvements, it is necessary to understand all the processes in the bearing, and especially those that take place in contacts of rolling elements. So far, most of the research was done on tribometers employing a ball-on-disc configuration. Tests on such devices are easy to perform but differ from conditions of actual bearings in some important aspects such as a contact geometry, presence of cage, number of contacts, spin motion of rolling elements, or action of centrifugal and capillary forces. The aim of this experimental study is to refer about film thickness during the initial running phase of simulated thrust rolling bearing and to reveal some patterns of lubricant behaviour for different conditions and greases. Measurements were carried out on unique apparatus of simulated thrust rolling bearing using optical methods with high speed camera. Results showed that the ball-on-disc configuration does not completely correspond to behaviour of actual bearings, mostly in terms of starvation and replenishment of grease. Multiple contacts in succession of simulated bearing do not tend to starve so rapidly and seriously during experiments as is presented in literature for ball-on disc configuration under similar conditions.

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Influence of the cage on the friction torque in low loaded thrust ball bearings operating in lubricated conditions

Cited by 22 publications

References 13 publications

Simulation of Friction Fault of Lightly Loaded Flywheel Bearing Cage and Its Fault Characteristics

Simulation of Friction Fault of Lightly Loaded Flywheel Bearing Cage and Its Fault Characteristics

Wind Turbine Lubrication Based on Parallel Control of Multiple Factors

Investigation of Film Thickness of Grease-Lubricated Thrust Bearing: From Ball-on-Disc to Bearing

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