A slipper optimization model based on equilibrium coefficient was proposed in order to solve the problem of heavy wear and tear of slippers in an axial piston pump or motor. The impact of hydrodynamic effect, squeezing effect and hot-wedge effect were stuided by introducing equilibrium coefficient in the force balance equation. As for flow continuity equation,the impact of laminar flow initial segment effect of slipper orifice and local resistance loss caused by import contraction and expansion were stuided by introducing flow correction coefficient. Slipper optimization model provided mathematical expression of slipper’s equilibrium coefficient and flow correction coefficient.The value of slipper’s equilibrium coefficient was obtained by simulation procedure in the practical optimization process. The main dimensions of slipper could be verified and optimized.The slipper optimization model was validated by experiments, results showed that the problem of heavy wear and tear of slippers was solved successfully with the optimized model,resulting in a decrease of 14 ℃ in temperature and an increase of 4.6% in total efficiency in axial piston motor.
XU Bing, CHAO Qun, ZHANG Jun-hui, LI Ying. Slipper optimization model based on equilibrium coefficient. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(6): 1009-1014.
［1］ KOC E, HOOKE C J, LI K Y. Slipper balance in axial piston pumps and motors ［J］.Transctions of the ASME,1992,114(4): 766-772.
［2］ HOOKE C J.The lubrication of slippers in axial piston pumps and motors: the effect of tilting couples ［J］.Proceedings of the Institution of Mechanical Engineers,Part C: Journal of Mechanical Engineering Science, 1989, 203(5): 343-350.
［3］ KOC E,HOOKE C J.Investigation into the effects of orifice size,offset and overclamp ratio on the lubrication of slipper bearings ［J］. Tribology International, 1996, 29(4)： 299-305.
［4］ KOC E,HOOKE C J.Considerations in the design of partially hydrostatic slipper bearings ［J］.Tribology International, 1997, 30(11)： 815-823.
SUN Yi,JIANG Ji-hai,LIU Cheng-qiang.Oil film characteristics and power consumption of slipper pair under redundant pressing force ［J］.Journal of South China University of Technology: Natural Science Edition, 2011,39(1)： 111-116.
LIU Hong,YUAN Shi-hua,PENG Zeng-xiong.Dynamic simula-tion of slipper bearing in axial pistion pumps ［J］. Transactions of Beijing Institute of Technology, 2011, 31(11)： 1282-1286.
XU Bing,LI Ying-bing,ZHANG Bin,et al.Numerical simulation of overturning phenomenon of axial piston pump slipper pair ［J］.Chinese Journal of Mechanical Engineering,2010,46(20): 161-168.
［10］ WIECZOREK U,IVANTYSYNOVA M.CASPAR: a computer aided design tool for axial piston machines ［C］∥ Proceedings of the Bath Workshop on Power Transmission and Motion Control PTMC, Bath: Professional Engineering Publishing,2000: 113-126
［11］ HOOKE C J.The effects of centrifugal load and ball friction on the lubrication of slippers in axial piston pumps ［C］∥ Proceedings of the 6th International Fluid Power Symposium,Section D, Cambridge: British Hydromechanics Research Association,1981: 179-191.
HAN De-cai,ZHOU Tie-nong,PAN Yong-ge.Experimental study on dynamical characteristics of oil film between slipper and swash plate under practical working conditions ［J］.Journal of Yanshan University,1989, 13(1): 35-38.
WANG Rui-jie.Judgement on the reason of burning loss of friction pair of slipping shoe and swashplate in axial plunger motor and investigation into its improvement ［J］. Lubrication Engineering,1994,19(1): 40-47.
