Performance analysis of high-stiffness bearing composited by hydrostatic cavities and tilting pads with preload
Abstract
Purpose
To meet the high stiffness requirement of bearings used in high-precision spindles, this paper aims to propose a novel kind of bearing composited by hydrostatic cavities and tilting pads with preload.
Design/methodology/approach
Cavities are cut on the oil seal surface of a hybrid bearing, in which the tilting pads are set up. The load of the bearing is carried by the hydrostatic cavities and tilting pads. The structural features of this compound bearing and the controlling variables of the main stiffness coefficient are presented. Two basic design principles are proposed on the basis of equal machining clearance (EMC) and equal installation clearance (EIC).
Findings
The theoretical analysis indicates that the stiffness of compound bearings under the EMC condition increases to infinity monotonously when the preload coefficient of the tilting pad tends to 1, while the stiffness under the EIC condition has a peak value. Therefore, a synthetic design principle is proposed by synthetically using the above-mentioned two principles. The applicable range of the three principles is discussed through an example.
Originality/value
The study about technological combination of hydrostatic cavity and tilting pad in this paper can provide suggestions for the design of a high-stiffness bearing in a precision spindle.
Keywords
Acknowledgements
This work is supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department (Program No. 15JK1528), the National Natural Science Foundation of China (Grant No. 51275395) and the National Science and Technology Major Project of China (No. 2012ZX04002-091).
Citation
Chen, R., Wang, J., Yuan, X., Li, L. and Cui, Y. (2018), "Performance analysis of high-stiffness bearing composited by hydrostatic cavities and tilting pads with preload", Industrial Lubrication and Tribology, Vol. 70 No. 4, pp. 773-781. https://doi.org/10.1108/ILT-03-2017-0052
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited