Volume 37, Number 4, August 2019
|Page(s)||774 - 784|
|Published online||23 September 2019|
Influence of Geometric Error of Rollers on Rotational Accuracy of Cylindrical Roller Bearings
School of Mechatronics and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2 Henan Key Laboratory for Machinery Design and Transmission System, Henan University of Science and Technology, Luoyang 471003, China
3 State Key Laboratory of Aviation Precision Bearings, Luoyang LYC Bearings Co., Ltd.,, Luoyang 471003, China
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.
Key words: cylindrical roller bearing / rotational accuracy / geometric error / roundness error / roller number
关键字 : 圆柱滚子轴承 / 旋转精度 / 几何误差 / 圆度误差 / 滚子个数
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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