Abstract
High-pressure axial piston pumps operate in high-speed and high-pressure environments. The contact state of the slipper against the swashplate can easily change from an oil film lubrication to a mixed oil film/asperity contact, or even dry friction. To improve the dry friction performance of slipper pairs and to avoid their potentially rapid failure, this study examined the effects of material matching on the dry friction performance of the slipper pair for high-pressure axial piston pumps. A FAIAX6 friction and wear tester was developed, and the dry friction coefficients of the slipper pairs matched with different materials were studied using this tester. Based on the thermo-mechanical coupling of the slipper pair with the working process, the contact surface temperatures of the slipper pairs matched with different materials were calculated and analyzed for the same working conditions. Following this, the effects of the material properties on the temperature increase at the slipper sliding contact surfaces were revealed. The reliabilities of the temperature calculations and analysis results were verified through orthogonal tests of slipper pairs matched with different materials. The results indicate that the influence of the material density on the friction coefficient is greater than that of the Poisson’s ratio or the elastic modulus, and that the slipper material chosen should have a high thermal conductivity, low density, and low specific heat, whereas the swashplate material should be high in specific heat, density, and thermal conductivity; in addition, the slipper pair should be a type of hard material to match the type of soft material applied; that is, the hardness of the swashplate material should be greater than that of the slipper material.
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Acknowledgements
This project was supported by the National Key Basic Research Program of China (973 Program, 2014CB046404), training plan for high-level innovative talent in Guizhou province (Grant No. Q.K.H.P.T.R.C [2016] 5659), preferred project of scientific and technological activities for personnel studying abroad in Guizhou province (Grant No. Q.R.X.M.Z.Z.H.T [2018] 0001), science and technology planning project in Guizhou Province (Grant No. Q.K.H.P.T.R.C [2017] 5788), and key research project on Innovation group of Guizhou Provincial Education Department (Grant No. Q.J.H. KY Z. [2018] 011).
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Huaichao WU. He obtained his Ph.D. degree in 2008 from State Key Laboratory of Fluid Transmission and Control, Zhejiang University, China. He carried out postdoctoral research in State key Laboratory of Tribology at Tsinghua University from 2013 to 2015. He was invited to visit University of California, Davis in USA, in 2016, as a visiting scholar for one year. He is now working as a professor in School of Mechanical Engineering, Guizhou University, China. He has been engaged in the research of friction, lubrication, and electrohydraulic control technology.
Limei ZHAO. She received the Ph.D. degree in 2013 from Guizhou University, China. She is currently an associate professor and master’s supervisor in School of Mechanical Engineering, Guizhou University, China. Her research interests include friction, lubrication, and mechatronic engineering.
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Wu, H., Zhao, L., Ni, S. et al. Study on friction performance and mechanism of slipper pair under different paired materials in high-pressure axial piston pump. Friction 8, 957–969 (2020). https://doi.org/10.1007/s40544-019-0314-2
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DOI: https://doi.org/10.1007/s40544-019-0314-2