Automatic discrete failure study of cage free ball bearings based on variable diameter contact

Zhao, Yaping; Zhang, Jingwei; Zhou, Enwen

doi:10.1007/s12206-021-1013-2

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…Then they are blown dry and weighed. According to the literature (Zhao et al, 2021), it can run for 300 hours under dry friction. Table 4 shows the amount wear extent of the damaged variable-diameter raceway at the same time and different speed.…”

Section: Experimental Researchmentioning

confidence: 99%

Research on vibration evolution of a ball bearing without the cage under local variable-diameter raceway damage

Zhou¹,

Zhao²,

Zhang³

2023

Journal of Theoretical and Applied Mechanics

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This article presents an analysis of vibration evolution of a ball bearing without the cage. A vibration model in which time-varying displacement, time-varying stiffness, contact force and collision force are comprehensively considered, is proposed. On this basis, the law of motion of the bearing is studied. It is shown that a variable-diameter raceway affects the radius of curvature, which effects the dispersion of rolling elements. The damaged variable--diameter raceway leads to discrete failure, contact force and collision force of rolling elements, which are main reasons that cause vibration mutation. The bearing motion changes from quasi-periodic to chaotic motion.

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Section: Experimental Researchmentioning

confidence: 99%

Research on vibration evolution of a ball bearing without the cage under local variable-diameter raceway damage

Zhou¹,

Zhao²,

Zhang³

2023

Journal of Theoretical and Applied Mechanics

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“…These particles will further act as stress concentration points and accelerate the development of cracks and pits, leading to the formation of large irregular pits. When the abrasive debris generated during wear is mixed with water or lubricant, it causes resistance during bearing operation, which can lead to fracture failure of the bearing in severe cases [ 76 , 77 , 78 ].…”

Section: Fault Analysis and Research On Tribological Faults Of Wind T...mentioning

confidence: 99%

Review of Tribological Failure Analysis and Lubrication Technology Research of Wind Power Bearings

et al. 2022

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Wind power, being a recyclable and renewable resource, makes for a sizable portion of the new energy generation sector. Nonetheless, the wind energy industry is experiencing early failure of important components of wind turbines, with the majority of these issues also involving wind power bearings. Bearing dependability is directly tied to the transmission efficiency and work performance of wind turbines as one of its major components. The majority of wind turbine failures are due to bearings, and the vast majority of bearing failures are due to lubrication. The topic of improving the accuracy and life of wind power bearing motion is becoming increasingly essential as the wind power industry develops rapidly. This study examines the various constructions and types of wind turbines, as well as their bearings. We also examined the most typical causes of friction and lubrication failure. Furthermore, contemporary research on wind turbine bearings has been compiled, which mostly comprises the study and development of lubrication technology and other areas. Finally, a conclusion and outlook on current challenges, as well as future research directions, are offered.

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“…The rolling elements of cageless bearing are in contact with each other during operation. The literature [37] proposed to design a variable diameter raceway structure in the outer ring raceway of the bearing. As shown in Figure 1, when rolling elements pass through the variable diameter raceway, the discrete effect is achieved.…”

Section: Motion and Contact State Of The Rolling Elementmentioning

confidence: 99%

“…In order to analyze the stress distribution at different positions of the variable diameter raceway, combining the two factors of the variable diameter raceway structure and normal load, the variable diameter raceway structure in reference [37] was taken as an example. The variation range of its curvature radius R i is 24.92 mm-25.7 mm.…”

Section: Numerical Analysis Of Contact Stressmentioning

confidence: 99%

Analysis of Contact Stress Distribution between Rolling Element and Variable Diameter Raceway of Cageless Bearing

2022

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The change in contact state between the rolling elements and raceway of a cageless bearing with a variable diameter raceway affect the wear of the bearing, which leads to discrete motion failure of the rolling elements. For this purpose, the contact characteristics as contact form and contact stress between the rolling elements and raceway were determined. A numerical method is proposed to determine the three-dimensional contact stress of a cageless bearing. First, combined with the variable diameter raceway structure characteristics and the motion of rolling elements, the rolling elements and raceway contact stress model was established, and the influence factors of contact stress and the maximum stress distribution were determined. Based on the rolling contact theory, the relative position of the stick-slip region and the tangential stress distribution of the contact area were analyzed. The stress equations for the three-dimensional between rolling elements and variable diameter raceway were obtained by the principle of superposition, and the stress component characteristics of the contact area were numerically simulated. The results show that the main influencing factors of contact stress are: load, structure of variable diameter raceway, spindle speed, friction coefficient µ and the ratio of the stick region and the slip region k. Taking a cageless bearing as an example, the influence of the contact curvature Ri on the contact stress is smaller than that of ri. Increasing ri to make it larger than 1.5 mm and controlling the speed to be lower than 13,950 r/min, the maximum stress appears in the conventional raceway, which is beneficial to alleviate the failure of the variable diameter raceway. There are a slip region and a stick region in the contact area, reducing the friction coefficient µ and increasing the stick-slip coefficient k appropriately can ensure the discrete movement of the rolling elements and reduce the wear of the variable diameter raceway. The error of the stress distribution model is less than 15%, which can predict and characterize the contact stress distribution between the rolling elements and the variable diameter raceway. The theoretical guidance for the development and application of cageless bearings is provided.

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Automatic discrete failure study of cage free ball bearings based on variable diameter contact

Cited by 7 publications

References 10 publications

Research on vibration evolution of a ball bearing without the cage under local variable-diameter raceway damage

Research on vibration evolution of a ball bearing without the cage under local variable-diameter raceway damage

Review of Tribological Failure Analysis and Lubrication Technology Research of Wind Power Bearings

Analysis of Contact Stress Distribution between Rolling Element and Variable Diameter Raceway of Cageless Bearing

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