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Investigation on the radial micro-motion about piston of axial piston pump

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Abstract

The limit working parameters and service life of axial piston pump are determined by the carrying ability and lubrication characteristic of its key friction pairs. Therefore, the design and optimization of the key friction pairs are always a key and difficult problem in the research on axial piston pump. In the traditional research on piston/cylinder pair, the assembly relationship of piston and cylinder bore is simplified into ideal cylindrical pair, which can not be used to analyze the influences of radial micro-motion of piston on the distribution characteristics of oil-film thickness and pressure in details. In this paper, based on the lubrication theory of the oil film, a numerical simulation model is built, taking the influences of roughness, elastic deformation of piston and pressure-viscosity effect into consideration. With the simulation model, the dynamic characteristics of the radial micro-motion and pressure distribution are analyzed, and the relationships between radial micro-motion and carrying ability, lubrication condition, and abrasion are discussed. Furthermore, a model pump for pressure distribution measurement of oil film between piston and cylinder bore is designed. The comparison of simulation and experimental results of pressure distribution shows that the simulation model has high accuracy. The experiment and simulation results demonstrate that the pressure distribution has peak values that are much higher than the boundary pressure in the piston chamber due to the radial micro-motion, and the abrasion of piston takes place mainly on the hand close to piston ball. In addition, improvement of manufacturing roundness and straightness of piston and cylinder bore is helpful to improve the carrying ability of piston/cylinder pair. The proposed research provides references for designing piston/cylinder pair, and helps to prolong the service life of axial piston pump.

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Authors and Affiliations

  1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Bing Xu, Junhui Zhang, Huayong Yang & Bin Zhang

Authors
  1. Bing Xu
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  2. Junhui Zhang
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  3. Huayong Yang
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  4. Bin Zhang
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Corresponding author

Correspondence to Bing Xu.

Additional information

This project is supported by National Natural Science Foundation of China(Grant No. 51075360), Doctoral Foundation of Ministry of Education of China(Grant No. 20090101110041), and National Key Technology R&D Program of the Twelfth Five-year Plan of China(Grant No. 2011BAF09B03)

XU Bing, born in 1971, is a professor at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. His main research interests include mechachonics control, fluid power components and systems.

ZHANG Junhui, born in 1984, is currently a PhD candidate at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. His research interests include piston pump and fluid born noise control.

YANG Huayong, born in 1961, is currently a professor and a PhD candidate supervisor at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. His main research interests include mechachonics engineering, fluid power transmission and control.

ZHANG Bin, born in 1980, is currently a postdoctoral at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. His research interests piston pump and fluid systems.

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Xu, B., Zhang, J., Yang, H. et al. Investigation on the radial micro-motion about piston of axial piston pump. Chin. J. Mech. Eng. 26, 325–333 (2013). https://doi.org/10.3901/CJME.2013.02.325

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  • DOI: https://doi.org/10.3901/CJME.2013.02.325

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