Experimental and numerical analysis of a self-circulating oil bearing system for gear pumps
Abstract
Purpose
For moderate pressure and high pressure gear pumps, the temperature failure problem of bearings is now of considerable concern because of their heavy loads. However, the compact structure and the efficiency consideration make it extremely difficult to improve the bearing cooling. A self-circulating oil bearing system is developed for gear pumps with self-lubricating bearings to solve this problem. The oil is aspirated in from the low pressure chamber of the gear pump and discharged to the same chamber by using the pressure difference in the journal bearing, thus achieving the self-circulation.
Design/methodology/approach
An experiment test rig has been built for the feasibility study. The oil flow rate under different speeds has been recorded. Furthermore, the temperatures of the bearings with or without the oil circulation have been compared. Additionally, the oil flow in the test rig has been simulated using computational fluid dynamics codes.
Findings
The experimental and numerical results agree well. The experimental results indicate that the oil flow rate increases approximately linearly with the speed and the bearing temperature can be lowered successfully. The calculation results indicate that the bearing load capacity is nearly the same. Both the experimental and numerical studies establish that the self-circulating oil bearing system works successfully.
Originality value
As far as the authors know, it is the first time to find that the self-circulation can be built using the pressure difference in the bearing oil film, and this principle can be applied in the cooling and lubrication of the gear pumps to solve the temperature failure problem.
Keywords
Acknowledgements
This study was supported by the National Natural Science Foundation of China (grant number 51275452) and the Science and Technology Project Funding for Electric Power of Zhejiang Province, State Grid Corporation of China (grant number 5211DS14005B).
Citation
Jintao, M., Chaohua, G., Xiaohong, P., Shuiying, Z. and Guangyao, Y. (2018), "Experimental and numerical analysis of a self-circulating oil bearing system for gear pumps", Industrial Lubrication and Tribology, Vol. 70 No. 1, pp. 115-125. https://doi.org/10.1108/ILT-07-2016-0143
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited