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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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meem_contribute@163.com
Abstract: Aiming at the problem that the return oil characteristics of an aviation hydraulic piston pump shell were unknown under the condition of high return oil pressure, taking an aviation hydraulic piston pump as the research object, the return oil characteristics of the pump shell were simulated and tested. Firstly, on the basis of solving the lubrication model of cylinder/valve-plate pair, the leakage models of cylinder/valve-plate pair, piston/cylinder pair and slipper/swash-plate pair were established respectively, considering different factors such as cylinder tilting, oil temperature and return oil pressure. Then, the leakage model of each friction pair was numerically solved, and the leakage law of them under different factors was analyzed. Finally, based on the leakage of each friction pair, the return oil pressure-flow characteristics of the pump shell were simulated. The return oil flow of the pump shell under different pressure was measured to verify the validity of the calculation results. The research results show that, when the inclination angle of the cylinder block is large and the return oil pressure is high, the contribution of the cylinder/valve-plate pair and slipper/swashplate pair to the return oil flow of the pump shell is negative. However, the contribution of piston/cylinder pair to the return oil flow of the pump shell is always positive. The return oil flow of the pump shell decreases with the increase of return oil pressure. When the return oil pressure of the pump shell is 1.37MPa, the return oil flow of the pump shell will drop to zero.
Key words: positive displacement pump; cylinder/valve-plate pair lubrication model; piston/cylinder pair; slipper/swash-plate pair; cylinder tilting; return oil pressure of pump shell; internal leakage
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