Journal articles on the topic 'Roller bearings'
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1
Tong, Van-Canh, and Seong-Wook Hong. "Study on the stiffness and fatigue life of tapered roller bearings with roller diameter error." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 2 (August 5, 2016): 176–88. http://dx.doi.org/10.1177/1350650116649889.
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Geometric imperfection is a common problem in manufacturing of rolling element bearings. In particular, roller geometric errors frequently occur because a large number of rollers with relatively small size are engaged in a bearing. However, computational tools for rolling bearing characteristics take into account ideal bearings without any geometric error. In this study, the stiffness and fatigue life of tapered roller bearings were investigated with consideration for the effects of roller diameter errors possibly induced during manufacturing process. To this end, a general model for tapered roller bearings having rollers with diameter error (or defective rollers) was developed that can reflect the time-varying stiffness due to the roller error effects. The effects of the number of defective rollers, error magnitude, and position of defective rollers on the stiffness and fatigue life were investigated. Computational results showed that even small roller diameter errors appreciably alter the tapered roller bearings internal load distributions and therefore the stiffness and fatigue life of tapered roller bearings.
2
Wei, Yan Gang, Yan Kui Liu, and Xiu Juan Zhang. "The Effects of Hollow Ratio on the Radial Bearing Properties of Pre-Loaded Cylindrical Roller Bearings." Advanced Materials Research 299-300 (July 2011): 1078–82. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.1078.
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The finite element method is adopted to analyze the pre-loaded cylindrical roller bearings according to the theory of contact mechanics. The effects of hollow ratio on the radial stiffness of bearings, the maximum contact stress of rollers, and the maximum radial load of bearing are analyzed. The analysis results show that the smaller the hollowness is, the larger the radial stiffness of pre-loaded cylindrical roller bearings, the maximum contact stress of the rollers, and the maximum radial load of the bearing would be. Under different magnitude loads, the reasonable combination of interference magnitude with the hollowness can not only increase the stiffness of roller bearings, but also decrease the maximum stress of rollers, which provides a reference for the design and manufacture of pre-loaded cylindrical roller bearings.
3
Qu, Tie, Qiang Bian, Guang Zeng, Chunjiang Zhao, Xiangyun Zhang, Lifeng Ma, and Ming Chen. "Study on Contact Force and Vibration Characteristics of Composite Cylindrical Roller Bearing." International Journal of Rotating Machinery 2022 (October 7, 2022): 1–10. http://dx.doi.org/10.1155/2022/7590924.
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The composite cylindrical roller is composed of a hollow cylindrical roller and a filler body and is a new type of structure roller bearing. In order to explore the influence of different parameters on the contact characteristics and vibration characteristics of bearings, finite element models of static contact, modal analysis, and harmonic response analysis of composite cylindrical roller bearings were established based on ABAQUS software. The effects of filling rate, radial force, and the number of rollers on parameters such as contact force, contact stress, and natural frequency were studied. The results show that when the filling rate of the cylindrical roller increases from 0% to 70%, the natural frequency of bearing and the peak frequency of its harmonic response decrease, the force distribution in the contact area is also more uniform, and the maximum contact stress of the roller is reduced by 29.1%; the radial force has no effect on the peak frequency of the harmonic response of the bearing, but the increase of the radial force will increase the peak value of the response displacement, and the contact force and stress of the rollers will also increase. When the number of rollers increases from 11 to 15, the natural frequency and the peak frequency of harmonic response increase, the peak displacement decreases, the contact force distribution of the rollers in the bearing area is more uniform, and the maximum contact stress of the roller is reduced by 21.1%. The research result can provide a theoretical reference for the structural optimization and engineering application of elastic composite cylindrical roller bearings.
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Yu, Yongjian, Guoding Chen, Jishun Li, and Yujun Xue. "Influence of Geometric Error of Rollers on Rotational Accuracy of Cylindrical Roller Bearings." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 4 (August 2019): 774–84. http://dx.doi.org/10.1051/jnwpu/20193740774.
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As the rotation of roller bearings is carried out under geometrical constraint of the inner ring, outer ring and multiple rollers, the motion error of the bearing should also be resulted from geometric errors of bearing parts. Therefore, it is crucial to establish the relationship between geometric errors of bearing components and motion error of assembled bearing, which contributes to improve rotational accuracy of assembled bearing in the design and machining of the bearing. For this purpose, considering roundness error and dimension error of the inner raceway, the outer raceway and rollers, a prediction method for rotational accuracy of cylindrical roller bearings is proposed, and the correctness of the proposed prediction method is verified by experimental results. The influences of roller's geometric error distribution, roller's roundness error and the number of rollers on the runout value of inner ring are investigated. The results show that, the roller arrangement with different geometric errors has a significant impact on rotational accuracy of cylindrical roller bearings. The rotational accuracy could be improved remarkably when multiple rollers with different dimension error are distributed alternately according to the size error. Even-order roundness error of rollers has a significant effect on the rotational accuracy, and the decrease level depends on the orders of roundness errors of bearing parts and the number of rollers. But odd-order roundness error of rollers has almost no effect on the rotational accuracy. The rotational accuracy of assembled bearing would be significantly improved or decreased when even order harmonic of rollers and the number of rollers satisfy specific relationships. The greater the order of roundness error of the rollers, the more severe the influence of the roller number on rotational accuracy of assembled bearing. The rotational accuracy can not be always improved with the increase of the number of rollers.
5
Gupta, P. K. "On the Geometrical Imperfections in Cylindrical Roller Bearings." Journal of Tribology 110, no. 1 (January 1, 1988): 13–18. http://dx.doi.org/10.1115/1.3261553.
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Computer simulations of the dynamics performance of roller bearings, as obtained by the computer code ADORE, are used to model the infuence of race out-of-roundness, race taper and centrality of land on partly crowned rollers. Both oil and solid lubricated high-speed roller bearings are considered and the overall performance parameters, such as, bearing life, heat generation, cage interactions and race flange wear due to roller skew and tilt, are correlated to the magnitude of the various geometrical imperfections. Thus the strength of computer modeling approach to optimization of geometrical tolerances in cylindrical roller bearings is demonstrated.
6
HE, Peiyu, Yi DING, Yun WANG, Fuzhu LI, Weili LIU, and Hua WANG. "analysis method of carrying capacity accuracy of three-row roller slewing bearing." Mechanics 28, no. 4 (August 30, 2022): 266–72. http://dx.doi.org/10.5755/j02.mech.29914.
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Three-row roller slewing bearings are one of the critical core components of large rotating equipment. Heavy-duty conditions have extremely high requirements for the carrying capacity. The new load capacity analysis method proposed in this paper can effectively improve the accuracy and efficiency of the carrying capacity analysis of three-row roller slewing bearings. The three-row roller slewing bearing solid rollers are replaced in the model by the upper and lower halves of the rollers and two springs. The local contact model of the three-row roller slewing bearing was established and verified by the Hertz contact theory. The overall finite element model of the three-row roller slewing bearing was verified by strain tests. The new method can calculate the stress and strain distribution, load distribution, and deformation of the entire circle of the three-row roller slewing bearing and reduce the mesh number of the finite element of the overall model. Roller chamfer can also be considered closer to the actual working conditions and improves calculation efficiency and accuracy.
7
Tong, Van-Canh, Sun-Woong Kwon, and Seong-Wook Hong. "Fatigue life of cylindrical roller bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 5 (September 7, 2016): 623–36. http://dx.doi.org/10.1177/1350650116668767.
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This paper dealt with the fatigue life of cylindrical roller bearings with several significant error sources that may occur during installations. A four degree-of-freedom quasi-static model for cylindrical roller bearings was developed, which took into account potential error sources such as angular misalignment, axial offset, and radial clearance, together with inertial loading by rotational speed and induced moment loads. A 3D contact model was employed to provide contact pressure distributions in rolling elements. The fatigue life of a cylindrical roller bearing was analyzed as a function of angular misalignment under various loading conditions. Then, the fatigue life analysis was extended to the combined effects of radial clearance, axial offset, and the number of rollers, along with angular misalignment. The computational results showed the significance of each error source on fatigue life. They further showed that cylindrical roller bearing fatigue life maximized when the radial clearances were slightly negative, and that it increased almost linearly with the number of rollers.
8
Wang, Zhi Wei, Ling Qin Meng, Wen Si Hao, and E. Zhang. "Fesability Analysis of Solving Contact Problem of Roller Bearing by Finite Element Method." Advanced Materials Research 145 (October 2010): 68–72. http://dx.doi.org/10.4028/www.scientific.net/amr.145.68.
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Contact problem is one of the most basic problems in the analysis of roller bearings, and the analysis and computation of contact stress and contact deformation are of great importance in roller bearing design. To solve the contact problems of roller bearing, we could use the Traditional method-- Hertz theory, the traditional method to solve the contact problems of roller bearings, is limited in the precision and unable to show the distribution characteristic of stress in contact area.In this paper, we use Finite Element Analysis software ANSYS to do research on contact problem of tapered roller bearing 3811/750/HC, and by means of comparison with the results gained by the Hertz theory we prove the feasibility of roller bearing contact problem by Finite Element Method. Hence, a more efficient method of improving the service life of rollers is got.
9
Wang, Zhi Wei, Ling Qin Meng, Wen Si Hao, and E. Zhang. "Finite Element Method Analysis and Optimal Design of Roller Convexity of Tapered Roller Bearing." Advanced Materials Research 139-141 (October 2010): 1079–83. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1079.
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The different designs of rollers with varied convexity give different stress distribution and elastic deformation. It is directly related to the load capability and the life length of the roller bearing. With the Finite Element Method(FEM), by analyzing the stress distribution of roller busbar and raceway contact area in the design of different rollers with varied convexity of tapered roller bearing, the paper gets the best solution for the design of convexity of tapered rollers and the cause of roller bearings’ early destroy. The optimal result shows that the service life of this bearing has been improved by 93%. Hence, a more efficient method of improving the service life of rollers is got.
10
Zhang, Qing, Jun Luo, Xiang-yu Xie, Jin Xu, and Zhen-huan Ye. "Experimental Study on the Skidding Damage of a Cylindrical Roller Bearing." Materials 13, no. 18 (September 14, 2020): 4075. http://dx.doi.org/10.3390/ma13184075.
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As large-scale rotating machines develop toward high rotating speed and high power–weight ratio, skidding damage has become one of the major initial failure modes of cylindrical roller bearings. Therefore, understanding the skidding damage law is an effective way to ensure the safety of machines supported by cylindrical roller bearings. To realize the skidding damage, a high-speed rolling bearing test rig that can simulate the actual operating conditions of aviation bearings was used in this paper, and the skidding damage dynamic behaviors of cylindrical roller bearings were investigated. In addition, to ensure the accuracy of the obtained skidding damage mechanism, the cylindrical roller bearing was carefully inspected by microscopic analysis when the skidding damage occurred. Out results show that instantaneous increases in friction torque, vibration acceleration, and temperature are clearly observed when the skidding damage occurs in the cylindrical roller bearing. Furthermore, under the conditions of inadequate lubrication and light load, the critical speed of skidding damage is rather low. The major wear mechanisms of skidding damage include oxidation wear, abrasive wear, and delamination wear. The white layers are found locally in the inner ring and rollers under the actions of friction heat and shear force.
11
Liu, Hong Bin, Lei Zhang, and Yong Sheng Shi. "Dynamic Finite Element Analysis for Tapered Roller Bearings." Applied Mechanics and Materials 533 (February 2014): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amm.533.21.
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Based on the finite element method of explicit dynamics and contact dynamics mechanics, a three dimensional solid finite element model was developed introducing physical elements for tapered roller bearing. The dynamic process numerical simulation of tapered roller bearing was carried out in ABAQUS. The vibration curves of the nodes on roller were drew. The changes of contact stress and contact stress distribution of rings, rollers and the cage in the process were analyzed. The results show it is basically consistent with the actual movement of rolling bearings.
12
Li, Yunfeng, and Yuanan Gao. "Internal load distribution of single-row tapered roller bearings doubly supporting main shaft of wind turbine." Advances in Mechanical Engineering 14, no. 5 (May 2022): 168781322210988. http://dx.doi.org/10.1177/16878132221098895.
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In order to accurately understand the internal loading state of the single-row tapered roller bearings doubly supporting the main shaft of wind turbine, a 5-DOF mechanical model of such bearing combination in wind turbine was established which considered the axial preload, bearing ring tilt, and roller crown. The positions of the points on the bearing raceways were described mathematically in the Cartesian coordinate system, and the mathematical relationship between the roller-raceway contact deformations and the bearing ring displacements was derived. The effect of bearing ring tilt caused by external loads on the contact load distributions along rollers was considered by dividing the rollers into laminae. The contact stress distribution between roller and raceway was obtained by iterative calculation of the finite length line contact model. The RMSE of the roller load distributions of the upwind bearing and the downwind bearing is 2.25 kN and 3.02 kN respectively. The obtained smallest size necessary for the roller laminae is 1.25% of the roller length. The bearing ring tilt will cause uneven contact load distribution along the roller, and modification of the roller profile improves the load and stress distribution. The machining error leads to the unbalanced contact stress distribution along the roller.
13
Shevchenko, S. V., and O. S. Krol. "CONSTRUCTION MODIFICATION OF RADIAL THRUST ROLLER BEARINGS." Globus: technical sciences 7, no. 1(37) (February 19, 2021): 4–8. http://dx.doi.org/10.52013/2713-3079-37-1-1.
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Analytical relationships have been developed for the design of modified tapered roller bearings based on standard bearings of the 7000 type. The modification consists in replacing the rolling elements in the form of tapered rollers with a straight generatrix by concave rollers with an arc generatrix, which are in contact with the convex raceways of the rings. By calculation, the advantage of modified roller bearings in terms of service life in comparison with standard roller bearings of similar overall dimensions is shown.
14
Tu, Wenbing, Ya Luo, Wennian Yu, and Yinquan Yu. "Investigation of the dynamic local skidding behaviour of rollers in cylindrical roller bearings." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 4 (July 9, 2019): 899–909. http://dx.doi.org/10.1177/1464419319861616.
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Skidding has a great influence on the reliability and the life of rolling element bearings. The previous research of bearing skidding mainly focussed on the gross skidding of bearings under severe conditions. However, the local skidding of rolling element also exists and cannot be ignored when bearing normally runs at steady state. In this paper, considering the discontinuous contact between the roller and the cage, the Hertz contact between the roller and races, lubrication, centrifugal effects and the cage pocket clearance, a nonlinear dynamic model is established to investigate the local skidding behaviour of a roller in cylindrical roller bearings. The equations of the dynamic model are solved by the fourth-order Runge–Kutta algorithm and verified by comparing simulation results with the published experimental data. The results show that the local skidding of the roller still noticeably exists in bearings even when the gross skidding can be ignored, especially on the inner raceway. The local skidding at the entry of the loaded zone may cause the smearing on the raceway surface. However, it can be found that the probability of the local skidding of the roller will be decreased by increasing radial load and reducing the bearing rotational speed. The cage pocket clearance would induce violent fluctuations on the roller rotational angular velocity as well as on the sliding velocity. Furthermore, it can generate extraordinary impact forces between the rollers and the cage. Thus, the cage pocket clearance should be carefully considered in the design of bearings.
15
Wu, Zheng-Hai, Ying-Qiang Xu, and Si-Er Deng. "Analysis of Dynamic Characteristics of Grease-Lubricated Tapered Roller Bearings." Shock and Vibration 2018 (November 13, 2018): 1–17. http://dx.doi.org/10.1155/2018/7183042.
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Tapered roller bearings (TRBs) are applied extensively in the field of high-speed trains, machine tools, automobiles, etc. The motion prediction of main components of TRBs under grease lubrication will be beneficial to the design of bearings and the selection of lubricating grease. In this study, considering the dynamic contact relationship among the cage, rollers, and raceways, a multibody contact dynamic model of the TRB was established based on the geometric interaction models and grease lubrication theories. The impacts of load, grease rheological properties, and temperature on the roller tilt and skew and the bearing slip were simulated by using the fourth-order Runge–Kutta method. The results show that the roller tilt angle in the unloaded zone is obviously larger than that in the loaded zone, while the roller skew angle in the unloaded zone is smaller than that in the loaded zone. As the speed increases, the roller tilt and skew and the bearing slip become more serious. Bearing preload can effectively reduce the bearing slip but will make the roller tilt and skew angle increase. The roller skew angle and the bearing slip decrease with the increase of the grease plastic viscosity. The roller tilt angle increases with the increase of the plastic viscosity. The yield stress of the grease has little effect on motions of the roller and cage. The influence of temperature on the roller and cage motions varies with the type of grease used.
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Olofsson, Ulf, Hans Sjo¨stro¨m, and Ulf Sjo¨din. "Increased Wear Resistance of Roller Bearings Using Me-C: H Coated Rollers." Journal of Tribology 122, no. 4 (May 8, 2000): 682–88. http://dx.doi.org/10.1115/1.1310559.
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The contact surfaces in a boundary lubricated spherical roller thrust bearing can change form due to sliding and particle generated wear. These form changes can seriously reduce the fatigue life of the bearings. An experimental test series has been performed where this effect was investigated in bearings with metal mixed amorphous carbon, Me-C: H, coated rollers that were tested against bearings with standard rollers. The experimental results show that while the bearings with standard rollers can fail due to wear, the bearings with coated rollers are at the same time almost unaffected by wear. Also the number of particles generated in the contact was significantly less when using coated rollers. There were twice as many self-generated particles when using a standard bearing compared with a coated bearing. The effect of the coating is discussed in terms of surface hardness, coefficient of friction and tribochemical phenomena. [S0742-4787(00)02004-X]
17
Zheng, Jingyang, Jinchen Ji, Shan Yin, and Van-Canh Tong. "Fatigue life analysis of double-row tapered roller bearing in a modern wind turbine under oscillating external load and speed." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 15 (March 17, 2020): 3116–30. http://dx.doi.org/10.1177/0954406220911966.
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Fatigue life analysis of roller bearing is usually performed for bearings under constant rotating speed and invariant loading conditions. For the bearings used in offshore floating direct-drive wind turbines, they often experience oscillating motions with varying loading patterns, for which the standard fatigue life analysis is not valid due to the presence of fluctuating loads. This paper presents the fatigue life analysis of a double-row tapered roller bearing under oscillating external load and speed conditions, which is used to support the main shaft of a large modern direct-drive wind turbine. First, a comprehensive quasi-static model of the double-row tapered roller bearing is developed for determining the internal load distribution of rollers. The contact pressure of rollers is then studied using an iterative scheme based on the elastic contact model. After that, the formulation of basic rating life of the double-row tapered roller bearing with oscillating external load and speed is given to calculate the fatigue life. Numerical simulations are carried out to investigate the effects of the oscillating load and speed, angular misalignment, and internal clearance on the fatigue life of the bearing.
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Zhang, Gang, Ming Yan Li, Chang Sun, Jian Zhang, and Hai Long Zhang. "Load Distribution of Cross-Roller Slewing Bearing." Applied Mechanics and Materials 224 (November 2012): 268–71. http://dx.doi.org/10.4028/www.scientific.net/amm.224.268.
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Because of cross roller-slewing bearing structure have a certain degree of particularity, and two sets of cross rollers is equivalent to two columns roller stack situation, therefore it should deduce roller calculation formula for two sets of roller respectively. According to the stress of the slewing bearings, we proceed load distribution calculation synthetically under the center of bearing axial force, overturning moment and radial force. Finally, based on the above formula for calculating the bearing load distribution and through the Matlab software, we analyze the influence of some parameters on the bearing load distribution. For ensuring bearing design parameter, it has the certain reference value.
19
Ghaisas, Niranjan, Carl R. Wassgren, and Farshid Sadeghi. "Cage Instabilities in Cylindrical Roller Bearings." Journal of Tribology 126, no. 4 (October 1, 2004): 681–89. http://dx.doi.org/10.1115/1.1792674.
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A six-degree-of-freedom model was developed and used to simulate the motion of all elements in a cylindrical roller bearing. Cage instability has been studied as a function of the roller-race and roller-cage pocket clearances for light-load and high-speed conditions. The effects of variation in inner race speed, misalignment, cage asymmetry, and varying size of one of the rollers have been investigated. In addition, three different roller profiles have been used to study their impact on cage dynamics. The results indicate that the cage exhibits stable motion for small values of roller-race and roller-cage pocket clearances. A rise in instability leads to discrete cage-race collisions with high force magnitudes. Race misalignment leads to a rise in instability for small roller-cage pocket clearances since skew control is provided by the sides of the cage pocket. One roller of larger size than the others causes inner race whirl and leads to stable cage motion for small roller-race clearances without any variation in roller-cage pocket clearance. Cage asymmetry and different roller profiles have a negligible impact on cage motion.
20
Silchenko, P. N., G. A. Timofeev, M. V. Mesnyankin, and E. S. Novikov. "Load Capacity of Eccentric Roller Bearings." Proceedings of Higher Educational Institutions. Маchine Building, no. 07 (724) (July 2020): 13–21. http://dx.doi.org/10.18698/0536-1044-2020-7-13-21.
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Eccentric roller bearings are commonly used in engineering and serve as actuating links in mechanical drives of various machines. Load capacity is one of the main parameters of such bearings. This paper presents possible kinematic schemes of an eccentric roller bearing and the specifics of the actual radial load distribution when it is applied to the driving ring between the rolling bodies. It is established that the load capacity of the eccentric roller bearing depends on the actual stress occurring when the rolling body of the minimal radius and the inner ring raceway are in contact. Equations are obtained for calculating the permissible radial load that the rolling body of the minimal radius with a raceway can bear. The limiting load is determined that satisfies the conditions of contact strength of the bearing’s assembly units and ensures performance of the bearing in a mechanical drive of a machine. The results of determining the limiting load of the eccentric roller bearing and the results’ analysis are presented using a specific example. To ensure the performance of the bearing, the optimal ratio of the inner ring radius to the minimum rolling body radius is determined.
21
Keller, Jonathan, Yi Guo, Zhiwei Zhang, and Doug Lucas. "Comparison of planetary bearing load-sharing characteristics in wind turbine gearboxes." Wind Energy Science 3, no. 2 (December 21, 2018): 947–60. http://dx.doi.org/10.5194/wes-3-947-2018.
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Abstract. In this paper, the planetary load-sharing behavior and fatigue life of different wind turbine gearboxes when subjected to rotor moments are examined. Two planetary bearing designs are compared – one design using cylindrical roller bearings with clearance and the other design using preloaded tapered roller bearings to support both the carrier and planet gears. Each design was developed and integrated into a 750 kW dynamometer tests, the loads on each planet bearing row were measured and compared to finite-element models. Bearing loads were not equally shared between the set of cylindrical roller bearings supporting the planets even in pure torque conditions, with one bearing supporting up to 46 % more load than expected. A significant improvement in planetary bearing load sharing was demonstrated in the gearbox with preloaded tapered roller bearings with maximum loads 20 % lower than the gearbox with cylindrical roller bearings. Bearing life was calculated with a representative duty cycle measured from field tests. The predicted fatigue life of the eight combined planet and carrier bearings for the gearbox with preloaded tapered roller bearings is 3.5 times greater than for the gearbox with cylindrical roller bearings. The influence of other factors, such as carrier and planet bearing clearance, gravity, and tangential pin position error, is also investigated. The combined effect of gravity and carrier bearing clearance was primarily responsible for unequal load sharing. Reducing carrier bearing clearance significantly improved load sharing, while reducing planet clearance did not. Normal tangential pin position error did not impact load sharing due to the floating sun design of this three-planet gearbox.
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Yu, Jianghong, Lei Xiang, Wen Yang, Chao Li, Yaoyao Deng, and Qishui Yao. "Modal and harmonic response analysis of a rolling bearing coupled by rigid and flexible materials." Materials Express 9, no. 9 (December 1, 2019): 1017–24. http://dx.doi.org/10.1166/mex.2019.1608.
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Elastic composite cylindrical roller bearing is a new type of rolling bearings. Its rolling body is composed of rigid and flexible materials. In order to investigate the modal characteristics and harmonic response rules of the elastic composite cylindrical roller bearings with different structural parameters, we computed the modal solutions of a cylindrical roller bearing and the elastic composite cylindrical roller bearings with filling degrees of 40%, 50% and 65%, and determined the scope of the excitation frequency according to the computed first twelve orders of the modal frequency. On this basis, we analyzed the steady-state response under a sinusoidal alternating load as well as the vibration conditions of the elastic composite cylindrical roller bearings with different filling degrees within the excitation scope, and explored the relationship between the responses such as displacement and stress and the excitation frequency. The results showed that the natural frequencies of the elastic composite cylindrical roller bearings with filling degrees of 40% and 50% were similar to that of a solid bearing, while that of the elastic composite cylindrical roller bearings with a filling degree of 65% was relatively smaller than that of a solid bearing. The vibration modes of the bearings mainly manifested as bending and torsional deformation of the inner rings. Under the action of an excitation load, the peak responses of the bearings occurred near the fifth and sixth orders of the natural frequency. This research can provide a theoretical reference for the optimal design and engineering applications of the elastic composite cylindrical roller bearings.
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Mehmet, I., G. Dogan, D. F. Chitariu, C. Dumitraș, and F. Negoescu. "Research on advances in roller bearing manufacturing." IOP Conference Series: Materials Science and Engineering 1182, no. 1 (October 1, 2021): 012045. http://dx.doi.org/10.1088/1757-899x/1182/1/012045.
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Abstract In general the manufacturing of bearing require strict technological step that are performed on highly specialized equipments that require timely adjustments at batch changes. The process of forging and heat treatment stages consume the most amount of energy but the most expensive stage is the grinding operation. An alternative to grinding and honing processes is hybrid machining by combined hard turning and rolling process. One main development directions of all major roller bearing manufacturers is improving durability of bearings by reducing the roughness by inducing high residual stresses in the surface layers of bearing rings and improving the profile of roller for reduced contact stress. Rolling can induce higher surface stresses and reduce roughness with benefits to the durability of the bearings. The present paper presents and analysis of the technological route for bearing ring and bearing roller and focuses on the research direction on the advances in manufacturing / machining methods for bearing rings and rollers.
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Popova, Diana, Nikita Samoylenko, Sergey Semenov, and Viacheslav Shisterov. "ANALYSIS OF THE EFFICIENCY OF APPLICATION OF BOMBINED ROLLERS TO REDUCE THE CONTACT TENSIONS IN THE ROLLER BEARING." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 60 (2020): 96–104. http://dx.doi.org/10.15593/2224-9982/2020.60.11.
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The main problem of using roller bearings with direct forming rolling elements in highly loaded units is the edge effect. A significant increase of stresses at the edges of the rolling elements is the cause of the fragility of highly loaded roller bearings, which is a significant problem, especially in such units as rotors of aircraft engines. The solution of this problem in aviation is the use of rolling elements with a modified contact - bombed rollers. This paper presents comparisons of the stress-strain state of contacts of pairs of bodies imitating bombarded rollers of various geometries. The calculation was performed by the finite element method in the ANSYS package. For the calculation, the contact of the roller with a flat plate was used. In the calculation, the stress-strain state of the roller with the direct forming, the roller with the rounding of the face and the bombed rollers with various shapes of the modified forming was evaluated. The calculation model is verified with respect to the classical Hertz formula. The dependence of stresses in the concentration zone on the relative dimensions of the bombarded part of the roller with a standard generator representing an arc of a circle is estimated. A form of the generatrix is proposed, which more effectively reduces stresses in the transition zone of the modified generatrix into the straight line. The proposed form of the generatrix eliminates the main drawback of the classical generatrix of the bombarded rollers - the appearance of a concentration zone in the transition region of the straight part of the roller to the bombed, thus providing a better stress distribution in the roller. The technique used to simulate the contact interaction of rolling elements in a roller bearing can be used to study the stress-strain state of roller bearings of a different geometry, including those used in modern gas turbine engines.
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Wei, Yan Gang, and Yan Kui Liu. "Finite Element Analysis of the Roller Bearing Used in Rolling Mill." Applied Mechanics and Materials 367 (August 2013): 141–44. http://dx.doi.org/10.4028/www.scientific.net/amm.367.141.
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The loading roller number and maximum stress of the bearings can not be calculated accurately through conventional methods because support manner of the roller bearings used in rolling mill is different from that of the roller bearings used in conventional condition. Based on characteristic of the bearings, the model of the bearing is made combining contact mechanics with finite element method. The loading roller number and maximum stress of the bearings are calculated through FEA. The work of this paper offers a reference to design and manufacture this kind of bearings.
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Park, Cheol Hoon, Tae Gwang Yoon, Dongwoo Kang, and Hugo Rodrigue. "High-Precision Roller Supported by Active Magnetic Bearings." Applied Sciences 9, no. 20 (October 17, 2019): 4389. http://dx.doi.org/10.3390/app9204389.
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Magnetic bearings support rotors in a non-contact way using magnetic force. Therefore, there is no friction and it is possible to measure and control the position of a rotor in the air gap. In this study, the rotational vibration of a roller was minimized using magnetic bearings, and a precision roller capable of automatic alignment using the position control function of magnetic bearings was proposed. A rotation accuracy of approximately 4.6 μm (peak-to-peak) was observed, even under a rotation of 30 rev/min and a radial force load of 300 N. The rotor position control experiment for magnetic bearings showed that 1-μm resolution position control is possible. To further improve the accuracy, the automatic alignment algorithm was proposed using magnetic bearings for the roller misalignment condition, and it was confirmed that alignment is possible at a level that the pressing force difference between both ends of the roller is within 0.3 N. Through this study, it was confirmed that rollers with magnetic bearings can be applied to precision equipment. It is expected that the implementation of the automatic alignment function will simplify the equipment configuration and maintenance compared to conventional rollers with ball bearings.
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Xia, Xintao, Shujing Dong, Liming Sun, and Tianju Chen. "Load Calculation and Design of Roller Crowning of Truck Hub Bearing." Open Mechanical Engineering Journal 9, no. 1 (February 26, 2015): 106–10. http://dx.doi.org/10.2174/1874155x01509010106.
Full textAbstract:
Double-row tapered roller bearing 353112 is used in trucks, and the external load and pressure distribution of the bearing are calculated combining with the specific operating conditions. Tapered roller bearings typically employ roller profile modification to equalize the load distribution, minimizing the stress concentration at the roller ends. Doing FEA (finite element analysis) on the contact stress with the changing roller crowning between roller and races, the appropriate roller profile and the crown drop of roller can be achieved. Finally the best control equation of roller crowning is obtained. It has important guiding significance for the improvement of roller crowning design of truck hub bearings.
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Bercea, I., D. Nélias, and G. Cavallaro. "A unified and simplified treatment of the non-linear equilibrium problem of double-row rolling bearings. Part 1: Rolling bearing model." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 217, no. 3 (March 1, 2003): 205–12. http://dx.doi.org/10.1243/135065003765714854.
Full textAbstract:
To increase the rigidity of bearings-shaft systems, the shaft is often supported by a series of double-row rolling bearings. Little work on multiple-row rolling bearings has been published. A comprehensive model is proposed which permits the determination of the internal interactions. The total elastic deflection between bearing rings is described using a vector-and-matrix method. A variety of double-row rolling bearing types are analysed, such as tapered roller bearing, cylindrical roller bearing, spherical roller bearing, self-aligning ball bearings and angular contact ball bearing. The basic internal geometry (including the internal clearance) and the effect of the initial preload (in term of the initial axial compression) are considered.
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Li, Mingshu, Yuhong Sun, Ling Wang, and Zhiteng Gao. "Quality Evaluation of Wind Turbine Roller Bearing Profile in the Ultra-long Flexible Blade." E3S Web of Conferences 251 (2021): 03082. http://dx.doi.org/10.1051/e3sconf/202125103082.
Full textAbstract:
In order to accurately measure and evaluate the quality of the roller profile of the ultra-long flexible blade bearing, an error evaluation model is established for the arc segment and the straight segment of the roller based on the least square method, and then an overall quality evaluation model is proposed based on these two error models. Through the simulation of a standard wind turbine cylindrical roller bearing, it is found that the quality evaluation model established in this work can effectively measure and evaluate the contour line of the wind turbine bearing’s roller. The overall absolute error is 0.0319 mm, which is consistent with the set random error. The overall quality evaluation model is also valid for other types of bearings commonly used in the wind turbine, which include arc and straight segments, and can be used to evaluate the error quality of the roller profile of wind turbine bearings.
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Jan Steininger, Stefan Medvecky, Robert Kohar, and Tomas Capak. "Optimization Procedure of Roller Elements Geometry with Regard to Durability of Spherical Roller Bearings." Communications - Scientific letters of the University of Zilina 22, no. 2 (April 1, 2020): 68–72. http://dx.doi.org/10.26552/com.c.2020.2.68-72.
Full textAbstract:
The article deals with an optimization procedure of roller elements geometry with regard to durability of spherical roller bearings. The aim of the article is to examine the impact of change of the roller elements inner geometry on durability and reliability of spherical roller bearings; the contact strain along a spherical roller by means of the Finite Element Method at contact points of components of a spherical roller bearing by means of designed 3D parametric models. The most appropriate shape of roller elements inner geometry of a bearing from the standpoint of calculated durability was determined based on results of the contact analyses.
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Prashad, Har. "Theoretical Analysis of the Effects of Instantaneous Charge Leakage on Roller Tracks of Roller Bearings Lubricated With High Resistivity Lubricants Under the Influence of Electric Current." Journal of Tribology 112, no. 1 (January 1, 1990): 37–43. http://dx.doi.org/10.1115/1.2920228.
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An analysis is presented for determining the effects of instantaneous charge leakage on the rise of contact temperature between rollers and roller track of races of roller bearings lubricated with high resistivity lubricant. Analysis is also given for the contact stresses on the races which lead to initiation of craters by the arcing effect on the roller tracks and subsequent damage to the roller bearing. Estimates of the leakage of charge between roller tracks and rollers during momentary asperity contacts along with an expression for the instantaneous contact resistance between roller and race was used to establish heat generated and instantaneous temperature rise in the contact zone on the roller tracks in each shaft revolution. Using this temperature rise, the contact stresses were determined and the minimum number of cycles was calculated before craters are initiated on the roller track of the races. The number of cycles thus determined corresponds, within the reasonable limits, to the appearance of the craters on the roller track of the inner race of a roller bearing, operated under the influence of electric current. Subsequently, the ratio of reduction in bearing life with that of the bearing operated under rolling friction without the influence of electric current is established. This paper gives general guidance for determination of instantaneous temperature rise due to charge leakage in the contact zone and makes it possible to predict the life of a roller bearing lubricated with high resistivity lubricant under the influence of electric current before the craters appear on the roller tracks.
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Zaichenko, Stefan, O. O. Seminskyi, Natalia Zhukova, Denys Derevianko, and Vadym Shalenko. "SPECIFICS OF DIAGNOSTICS OF TECHNICAL CONDITION OF TRANSPORT AND TECHNOLOGICAL SYSTEM “MINING GAS PIPELINE – MINE WORKING”." Geoengineering, no. 7 (December 5, 2022): 74–82. http://dx.doi.org/10.20535/2707-2096.7.2022.267610.
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The purpose. Study of the physical and mechanical processes that accompany the operational cycle of conveyor rollers with the aim of establishing the main factors that affect the resource and justifying the design of the seal to ensure the maximum period of operation and production costs.
Methodology. To achieve the goal, the regularities of the main processes accompanying the operational cycle of the conveyor roller, thermal expansion and cooling of the roller space - "breathing", heating of the roller from atmospheric effects, friction of the roller on the conveyor belt and in the bearings, have been established; a model of thermodynamic equilibrium of roller elements was created, which combines the main processes accompanying the operational cycle; uniform recommendations have been created that will allow to ensure the maximum period of operation and production costs of conveyor rollers.
Findings. According to the results of analytical studies of the main processes accompanying the operational cycle of the conveyor roller, thermal expansion and cooling of the roller space, significant heating of the roller space to 40ºС was established. The heating of the roller leads to a number of negative phenomena, among which it is possible to separate heating of the lubricant with loss of rheological properties, heating of seals with loss of tightness, heating of bearings to temperatures close to critical (90ºС). A change in the average temperature of the roller can lead to a significant change in pressure (14600 Pa) under conditions of complete tightness. None of the known seals that are used for conveyor rollers can withstand this sign-changing pressure drop. For labyrinth seals, when heated, the pressure is completely equalized to the atmospheric level, which creates a "breathing" effect. In the process of "breathing" a certain amount of water condenses from moist air, which can completely destroy any structure of the conveyor roller through electrochemical corrosion. The impossibility of sealing the space of the conveyor roller with known structures of labyrinth seals has been proven, which requires the development of new technical solutions for modernization.
Originality. A model of the thermodynamic equilibrium of roller elements has been created, which will combine the main processes accompanying the operational cycle. Which shows the linear dependence of the heating temperature change on the load, the rolling resistance of the bearing and the roller bearing.
Practical implications. The solution that will minimize the process of “breathing” of the roller is to isolate the space of seals and bearings from the inner space of the roller. To implement this solution, it is necessary to add an additional row of seals to each bearing on the opposite side from the outer one. Also, to reduce the effect of "breathing" of the roller due to sealing, it is appropriate to depressurize the space of the roller.
Keywords: conveyor, labyrinth seals, heating, rolling resistance, temperature.
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Kaczor, Jarosław. "EFFECT OF TAPERED ROLLER BEARINGS PRELOAD ON BEARING SYSTEM DURABILITY." Tribologia 298, no. 4 (April 30, 2022): 15–26. http://dx.doi.org/10.5604/01.3001.0015.8365.
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Tapered roller bearings are usually used in situations in which high bearing stiffness is required. However, a significant increase in stiffness can only be achieved by introducing initial tension (mounting clamp) to the angular contact bearings arrangement. Just like in case of angular contact ball bearings and tapered roller bearings, the preload is an axial displacement of one bearing relative to the other, measured from the neutral state and causing an increase in the internal forces in the bearings. Positive preload causes contact pressures of the rolling parts to appear even when no external force acts. The purpose of this work is to present the influence of the initial tension of a tapered roller bearings system on life of these bearings.
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Falodi, Abiodun, Yong K. Chen, Martin Caspall, Brian Earthrowl, and David Dell. "On the Measurement of Roller Skew of Tapered Roller Bearings." Applied Mechanics and Materials 217-219 (November 2012): 2328–31. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.2328.
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Roller skew in roller bearings can cause heat generation and reduce bearing life. Therefore, design to minimise its occurrence is essential in bearing development. This study investigated the roller skew of a double row tapered roller bearing under various running conditions. A new system of measurement using two differential variable reluctance transducers (DVRT) was developed. It is evident that the roller skew of the double row tapered roller bearing can be measured. The shaft rotational speed has a significant effect on roller skew but the radial load has little effect.
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Puşcaşu, Alin Marian, Octavian Lupescu, and Ana Bădănac. "Study regarding the structural response of standard cylindrical roller bearings using ANSYS and MESYS." MATEC Web of Conferences 178 (2018): 05012. http://dx.doi.org/10.1051/matecconf/201817805012.
Full textAbstract:
Bearings are manufactured in a wide variety of types and sizes especially with a single row of rollers, two rows of rollers or more, with cages or roller beside roller. Researches carried out by authors in this paper have followed a comparative analysis between a standard cylindrical roller bearings design and a prototype design using finite element method software's like ANSYS and MESYS. ANSYS is commonly used and enjoyed by an extended use in the structural areas, for analysis. ANSYS it consists of three main phases: Pre-processing, conducting or importing of the solid model system that are to be analyzed, solid meshing design in finite elements, implementation of conditions and loads at the limit, Processing, numeric solving of the characteristic equations behavior of the system and getting the solution, Post-processing, viewing the results in order to analyses system reaction and identification of areas with critical applications. The purpose of the study was to collect data's using two different software's and after to compare them with mathematical results. Using the ANSYS in this purpose it was able to analyses the design of the structure of the cylindrical roller bearing in detail.
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Klebanov, I. M., V. V. Murashkin, M. I. Kondratev, I. E. Adeyanov, and K. A. Polyakov. "Working in of roller ends and bars of cylindrical roller bearings at combined radial and axial loads." Journal of Physics: Conference Series 2094, no. 4 (November 1, 2021): 042071. http://dx.doi.org/10.1088/1742-6596/2094/4/042071.
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Abstract The paper investigates the influence of the process of running-in the ends of rollers and sides of cylindrical roller bearings on the conditions of hydrodynamic contact of these parts: the formation of an oil film and friction. For this purpose, the results of finite element modeling of the stress-strain state of the bearing parts in contact: the inner ring, the side flange and a fragment of the axle of the wheelset, and the multi-mass simulation of the dynamics of the bearing operation are used. The influence of the yaw angle of the roller on the size and shape of the contact area on the side is investigated. The dependences for calculating the thickness of the oil film in the contact between the ends of the rollers and the flanges of the bearing rings are being refined, which now make it possible to take into account the misaligned position of these parts during their force interaction. The results are illustrated using the example of a roller bearing of standard size 232926.
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Su, Y.-T., and Y.-T. Sheen. "On the Detectability of Roller Bearing Damage by Frequency Analysis." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 207, no. 1 (January 1993): 23–32. http://dx.doi.org/10.1243/pime_proc_1993_207_095_02.
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This study investigates the detectability of roller bearing damage by the frequency analysis of bearing vibrations. The magnitude characteristics of peaks in the vibration spectra are analysed. It is shown that the frequency information of vibration spectra for undamaged roller bearings can be the same as that for damaged ones. However, the magnitude information of vibration spectra for undamaged roller bearings is different from that for damaged ones. Thus, to detect the initial fault of roller bearing reliably, both the frequency information and magnitude information of vibration spectra have to be used.
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Xing, Yu, Hua Xu, Shiyuan Pei, Xi Zhang, and Wei Chang. "Mechanical analysis of spherical roller bearings due to misalignments between inner and outer rings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 17 (April 4, 2016): 3250–62. http://dx.doi.org/10.1177/0954406216643108.
Full textAbstract:
This research presents a theoretical model to analyze the mechanical performance of spherical roller bearings, taking account of the angular and centroidal misalignments between the inner and outer rings. The angular misalignment can be improved by spherical roller bearings self-aligning feature to a certain degree. The interpolation method is used to determine the self-aligning contact angles of the different rollers. The centroidal misalignment is described by the angular and distance deviations. Non-Hertzian contact theory is applied to model and calculate the rollers load-distribution and total contact angles as well as the displacement of the inner ring. The loads of the rollers with the misalignments features and the external loads are included in the equilibrium equations, which is solved by Newton-Raphson method. This research shows spherical roller bearings self-aligning ability can balance the additional bending moment caused by the angular misalignment, which is at the cost of reducing its carrying capacity. But this carrying capacity will be improved to a certain degree by a proper axial load. It also illustrates that any kinds of centroidal misalignments are harmful for the service life of bearings. But the location of the misalignments can be roughly inferred by the external loads and the displacement of the inner ring, which is helpful for spherical roller bearings fault diagnose and elimination.
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Brecher, C., M. Fey, and J. Falker. "Theoretische Analyse eines neuen Loslagerkonzepts*/Theoretical analysis of a new floating bearing - The simulated operational behavior of FRB bearings in comparison to reference bearings." wt Werkstattstechnik online 105, no. 05 (2015): 285–90. http://dx.doi.org/10.37544/1436-4980-2015-05-37.
Full textAbstract:
Das Floating-Roller-Ball (FRB)-Lager ist ein Konzept für Radiallager als Loslager für Hochgeschwindigkeits-Motorspindeln, das die Vorteile von Zylinderrollenlagern und angestellten Mehrpunktlagern in einer neuen Wälzkörpergeometrie kombiniert. Zur Auslegung des ersten Prototyps wurde mithilfe eines Berechnungstools das theoretische Betriebsverhalten untersucht. Die Berechnungsergebnisse liefern Randbedingungen als Grundlage zur experimentellen Untersuchung des Lagerkonzepts. Floating roller ball bearings provide a new floating bearing system for high-speed motor spindles, combining the advantages of both cylindrical roller bearings and elastically mounted multi-contact point bearings in a new roller geometry. To design the first prototype, the operational behavior of the bearing system was analyzed theoretically by a new calculation tool. The results provide the basis for the experimental investigation of the bearing concept.
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Wei, Yan Gang, Hai Tao Li, and Yan Tao Wang. "Crowned Profile Design of Roller Bearings Used in Rolling Mill Based on Three Dimension FEA." Advanced Materials Research 764 (September 2013): 75–79. http://dx.doi.org/10.4028/www.scientific.net/amr.764.75.
Full textAbstract:
Aiming at the characteristic of bearings supported in rolling mill and combining contact mechanics and finite element method, the edge effects of the cylindrical roller bearings used in the rolling mill are analyzed based on FEA for the Roller system of Rolling Mill and FEA of the bearing whole. According to the results of three dimensions FEA on the edge effects, different modification curves are taken to design crowned profiles of the cylindrical roller bearings. And comparison between the effects of the different modification curves is done through the simulation of 3D FEA, so the guides are offered to optimize the cylindrical roller bearings used in the rolling mill.
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Napadłek, Wojciech. "Analysis of Tribological Processes in Components of Massive Roller Bearings." Solid State Phenomena 220-221 (January 2015): 319–23. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.319.
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The paper presents an analysis of tribological processes on the surface layer of large roller bearings parts carried out on bearing steel 100CrMn6. Laboratory tests carried out on roller bearings elements eg. the axle railway wagons exploitation around 600 thousand km. Modern optical microscopy with fiber optic transmission and special software was used; scanning electron microscope was applied to analyze surface stereometry; profilometers made an analyze of seizure of co-working tribological parts: roller – race roller bearings. In addition, the documentation of characteristic tribological processes occurring during the exploitation the bearings was completed. Seizure zones contact surface which occur under high and variable loads and friction were found.
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Liu, Yuwei, Xingyu Fan, Jia Wang, and Xiayi Liu. "An Investigation for the Friction Torque of a Tapered Roller Bearing Considering the Geometric Homogeneity of Rollers." Lubricants 10, no. 7 (July 12, 2022): 154. http://dx.doi.org/10.3390/lubricants10070154.
Full textAbstract:
The geometric homogeneity of rollers, namely the dimension and shape deviations among rollers in a roller bearing, is one of the most important manufacturing errors. However, to the best of the authors’ knowledge, no specified investigation has been carried out on the effects of the geometric homogeneity of rollers on the friction torque of tapered roller bearings (TRBs). By introducing the diameter deviation of rollers and the distribution form of rollers with a diameter deviation, this study presents a mathematic model to reveal the effects of the geometric homogeneity of rollers on the friction torque of TRBs. The geometric homogeneity of the rollers, although having only a minimal influence on the overall friction torque acting on rings, can lead to a significant increase in the slide friction force between the individual rollers and the inner raceway. By comparing the distribution form of rollers with a diameter deviation, the diameter deviation value of the roller shows a significant influence on the maximum sliding friction between the roller and the inner raceway. The impact of the geometric homogeneity of rollers on the sliding friction between the roller and the inner raceway is more pronounced under light load conditions. The above-mentioned comparisons and conclusions can be used in formulating machining error criteria for TRB rollers.
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Barzdaitis, Vytautas, Pranas Mažeika, and Vytautas V. Barzdaitis. "Diagnostics Problems and Decisions of Low Rotation Speed Rotors with Antifriction Bearings." Solid State Phenomena 199 (March 2013): 15–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.15.
Full textAbstract:
The essence of the paper was to design technical condition monitoring and failure diagnostic evaluation method of low rotation speed rotors with self-aligning antifriction roller bearings. The technical condition of bearings and failures of the cylindrical rollers and cylindrical wheels surfaces were tested in situ using mechanical vibration parameters measurement method. The theoretical part of the paper was constrained to the modeling of two cylinders in the case of different damages levels of the spherical roller bearings.
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Hassan, Shaker S., Ahmed Adnan Shandookh, and Omar Alaa Ihsan. "Study the Effect of Using Different Bearing Types on the Performance of Evaporative Cooler." Al-Nahrain Journal for Engineering Sciences 21, no. 4 (December 21, 2018): 532–38. http://dx.doi.org/10.29194/njes.21040532.
Full textAbstract:
An investigation of performance response of two types of bearings such as Cylindrical Roller Bearing and bush bearing on evaporative cooler driven by DC motor of 1500 r.p.m, through studying many parameters like vibration response, temperature raise, humidity, sound level and total performance. high quality 3D positions X, Y and Z, vibration sensors type (ADXL335 accelerometers) with Arduino mega 2560 that interfaced with Lab-View program were used to measure changes in vibration amplitude and frequency. Two temperature sensors of type (LM35) were used to investigate the temperature raise in the bearings also with Arduino mega 2560 that interfaced with Lab-View program. For humidity a sensor of type DHT22 was used, also, a portable device was used to measure electricity consumption, rotary speed and sound level in the bearings of evaporative cooler. By replacing bearings all the parameters above wear measured then a comparison between them were made to find the best performance and operation of these bearings. The obtained results from the experimental work have clarified and explained by tables and figures. It has been found that the vibration of evaporative cooler in X, Y and Z-directions increased by using two cylindrical roller bearings than using two of bush bearings. The temperature of cylindrical roller bearings increased When running the evaporative cooler more than bush bearings. the noise of Evaporative Cooler by using both types of Bearings was almost same but with a little Reduce by using cylindrical roller Bearings. Which means the Evaporative Cooler has better Performance by using bush bearings than using cylindrical roller bearings.
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Ma, Fangbo, Fengyuan Jiang, and Qi An. "Simulation of hydrodynamic lubrication between cage pockets and rollers in cylindrical roller bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 14 (December 7, 2014): 2551–60. http://dx.doi.org/10.1177/0954406214562462.
Full textAbstract:
A calculating model for roller-pocket rotation and mechanics analysis is established to investigate the hydrodynamic lubrication between rollers and straight-sided cage pockets in a cylindrical roller bearing. An algorithm for calculating roller-pocket oil film pressure and film thickness is developed. Hydrodynamic lubrication simulation of the roller-pocket clearances is carried out. Effects of inner ring rotation speed, cage angular acceleration, roller profile and cage geometry on roller-pocket oil film performance are numerically studied. Some regular curves and conclusions are obtained and analyzed.
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Liu, Xiangyang, Rongjun Niu, Bin Wang, Shuai Zhang, Yongcun Cui, and Zhanli Zhang. "Crowning Method on Bearing Supporting Large Wind Turbine Spindle Considering the Flexibility of Structure of Shaft System." Machines 11, no. 1 (December 26, 2022): 28. http://dx.doi.org/10.3390/machines11010028.
Full textAbstract:
To meet the precision design of bearings on large wind turbine spindles, a crowning method of bearing on wind turbine spindles considering the flexibility of the support structure is proposed. Firstly, a finite element (FE) model of the shaft system with a flexible structure is constructed by connecting the shaft and bearing through constraint equations (CE) and multi-point constraint (MPC) algorithms and replacing the bearing rollers with nonlinear spring elements and dampers. Then, the Newmark integration algorithm is used to solve the model and analyze the effect of the structure’s rigidity on the load distribution of bearings. Then, perform convergence analysis of the sequences of the spring load distribution using a high-pass filter based on fast Fourier transform (FFT) and root mean square error (RMSE) to obtain a suitable number of replacement springs. Finally, a sub-model of the upwind bearing is constructed with structured mesh. With the maximum Von Mises stress of the roller profile as the design target, the optimal logarithmic crowning of the roller and its tolerance zone under the given working conditions are obtained. The results show that the FE model of the shaft system proposed has good convergence. The FE model of the shaft system considering the flexibility of the support structure can obtain more accurate load distributions of bearings and can make the accurate crowning design of the bearing rollers based on the actual working conditions. This provides support for the precision design of bearings in large shaft systems.
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Long, Risheng, Zhen Pan, Zhihao Jin, Yimin Zhang, Shaoni Sun, Yueyong Wang, Yibing Wang, and Manhong Li. "Tribological behavior of grooves textured thrust cylindrical roller bearings under dry wear." Advances in Mechanical Engineering 13, no. 12 (December 2021): 168781402110672. http://dx.doi.org/10.1177/16878140211067284.
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To prolong the serve life of roller element bearings (REB) and improve the reliability of mechanical system, the tribological behavior of the “washers-cage-rollers” system of grooves textured thrust cylindrical roller bearings (TCRB, 81107TN) under dry wear was researched. The pattern parameters include: width of grooves (WOG, 50, 100, and 150 μm), depth of grooves (DPOG, 7, 11, and 15 μm), as well as groove deflection angle (GDA, 0°, 45°, 90°, and 135°). The influence mechanism of grooves on the tribological properties of REBs is discussed. The results show that: As the GDA is 45°, the coefficient of friction (COF) and mass loss of bearing is the lowest among four angles. The average COFs of grooves textured bearings are much higher than that of smooth one, and their mass losses are all lower than that of smooth bearing. The influence of pattern parameters on the surface stresses of grooves textured bearings is weak. In this work, when the WOG is 50 μm and the DPOG is 7 μm, the wear loss of grooves textured bearing is the lowest, reduced by up to 75.6%. This work can provide a valuable reference for the raceway design and optimization of REBs.
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Anishсhenko, O., V. Kukhar, A. Pryisyazhnyi, and I. Takhtamysh. "Analysis of roller designs for sintering and firing machines." Problems of tribology 97, no. 3 (September 28, 2020): 32–38. http://dx.doi.org/10.31891/2079-1372-2020-97-3-32-38.
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The article analyzes the known constructions of roller units of carts for the manufacture of agglomerate and pellets on conveyor lines. The article points out the advantages and disadvantages of roller designs, the lack of standard technical solutions for the design of roller assemblies, as well as reliable methods for calculating their parts for strength and durability. To increase the life of the rollers, the authors, after successful industrial tests, offer innovative technical solutions: seals in the form of stuffing boxes made of expanded graphite fibers reinforced with steel thread; bearing antifriction filler made from polytetrafluoroethylene, carbon fiber and graphite. The article shows that due to axial loads during the operation of the bogies, it is impractical to use ball bearings in the ball, they should be replaced with roller bearings. The authors propose an approximate method for calculating the durability of bearings, which additionally takes into account the elastic deformation of the material of the bogies during their thermal expansion and the gaps in the nodes of the bogies. The authors use the calculation of experimental results on the size of the gaps in the nodes of the bogies, the curvature of the body of the heated bogies on the conveyor line and their movement on three rollers instead of four, take into account the change in the coefficient of linear expansion of the material of the bogie depending on the increase in the heating temperature of the case.
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Lu, Li Ming. "The Stress Analysis about Rolling-Sliding Blend Bearing under Heavy Load." Advanced Materials Research 308-310 (August 2011): 1792–95. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1792.
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In the paper a new kind of rolling-sliding blend bearing has been studied. In order to comparing the new bearings and rolling bearings in the carrying capacity and service life, the stresses on the inner ring, the outer ring and the roller of rolling bearing and rolling-sliding blend bearing are analyzed by establishing the finite element model and solving it with finite element analysis software. The results show that the width of the stress concentration area on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent narrower than that of rolling bearing and the depth of the largest stress on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent shallower than that of rolling bearing and the largest stress on the middle and the end of the outer ring and the roller and the inner ring of rolling-sliding blend bearing is much smaller than that of rolling bearing. In the same case rolling-sliding blend bearings have greater carrying capacity and longer service life than rolling bearings.
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Wei, Yan Gang, Yan Kui Liu, and Xiu Juan Zhang. "Theoretical Research on the Radial Stiffness of Pre-Loaded Hollow Cylindrical Roller Bearings." Key Engineering Materials 464 (January 2011): 362–65. http://dx.doi.org/10.4028/www.scientific.net/kem.464.362.
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For solving the problems of classical mechanics on the stiffness of hollow cylindrical roller bearings, the radial stiffness of pre-loaded hollow cylindrical roller bearings is analyzed with finite element method and the elastic deformation of inner and outer rings is also taken into account. The effects of load, interference magnitude, and hollow ratio on the bearing stiffness are researched fatherly. The results show that the bearing stiffness correlates not only with the interference magnitude and hollow ratio, but also with load, which offers the references for designing and using the pre-loaded hollow cylindrical roller bearings.