1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
2. Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, Nanjing 211106, China
A new cylinder seal was investigated to improve the performance of reciprocating seal installed in the aircraft hydraulic cylinder. Firstly, the analysis of the working principle of general hydraulic reciprocating seal pointed out the effect of contact pressure distribution on seal leakage and friction, and the most suitable contact pressure distribution method was obtained. Secondly, the VL seal was modeled and simulated, and the contact pressure distributions at different fluid pressures were obtained to reveal the relationship between the construction and contact pressure distribution during the process of building fluid pressure. The adaption of the seal structure against high fluid pressure and the principle of the special pressure distribution of the VL seal were pointed out. Finally, comparison among the VL seal, O ring seal and step seal was carried out by analyzing their frictions and leakages, respectively. Results show that the VL seal has the best performance of leakage and liability．
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