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Effect of piston clearance on the lubrication performance in axial piston pump

Bora Lee (School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea)
Yonghun Yu (School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea)
Yong-Joo Cho (School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 10 September 2019

Issue publication date: 14 January 2020

Abstract

Purpose

This paper aims to provide a reliable and efficient numerical piston–cylinder design method and assess the effect of clearance on the piston-cylinder lubrication.

Design/methodology/approach

Numerical analyses of lubrication characteristics were performed for the piston–cylinder interface. The axial piston was numerically modeled, and the film pressure was calculated using the unsteady two-dimensional Reynolds equation. The behavior of the piston was analyzed by calculating the eccentricity satisfying the force and moment balance.

Findings

The secondary motion of the piston included numerically simulated several cycles until the piston behavior converged, and contact with the inner wall of the cylinder and friction region was estimated. Results showed that the piston–cylinder clearance affected the contact force, length of the contact region and leakage flow rate.

Originality/value

This result improves the understanding of the piston–cylinder lubrication and suggests considerations in terms of lubrication in clearance design.

Keywords

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIP) through GCRC-SOP (No. 2011-0030013).

Citation

Lee, B., Yu, Y. and Cho, Y.-J. (2020), "Effect of piston clearance on the lubrication performance in axial piston pump", Industrial Lubrication and Tribology, Vol. 72 No. 1, pp. 146-150. https://doi.org/10.1108/ILT-05-2019-0187

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited