Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (10): 30-35,42.doi: 10.3969/j.issn.1000-565X.2016.10.005

• Mechanical Engineering • Previous Articles     Next Articles

Oil Characteristic Analysis of Piston-Cylinder Interface in Axial Piston Pump with Radial Micro-Motion

LI Jing CHEN Hao YIN Yao-bao   

  1. School of Mechanical Engineering,Tongji University,Shanghai 200092,China
  • Received:2015-12-11 Revised:2016-04-22 Online:2016-10-25 Published:2016-09-01
  • Contact: 李晶(1972-)，女，博士，副教授，主要从事液压系统及元件热分析和液压虚拟测试技术等研究． E-mail:cynthia_li@tongji.edu.cn
  • About author:李晶(1972-)，女，博士，副教授，主要从事液压系统及元件热分析和液压虚拟测试技术等研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China(51275356) and the Ministry of Industry and In- formation Technology of China for Civil Aircraft(MJF201302)

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Abstract:

In order to analyze the influence of the radial micro-motion of piston-cylinder interface on the oil charac- teristic,based on the theory of dynamic pressure supporting,the oil shape in the piston-cylinder interface with dif- ferent pressure and rotating speeds as well as its change is simulated.Then,a hydraulic pump is tested by using a service life test bench,and the test results are compared with the theoretical ones.The results show that (1) with the radial micro-motion,there exists a minimum oil thickness,and the pressure in the interface is higher than that in the cylinder; (2) the thickness in the pressing area linearly increases with the increase of pressure; (3) as the rotating speed increases,the thickness in the pressing area decreases and the decrease tends to become smaller; (4) when the turning angle is 90°,the thickness reach the minimum value; (5) in the absorbing area,the mini- mum oil thickness is irrelevant to the rotating speed,and it is smaller than that in the pressing area; and (6) the position of the minimum oil thickness is consistent with the direction of the centrifugal force.

Key words: piston pumps, radial micro-motion, piston-cylinder interface, dynamic pressure supporting, oil characteristic