Research On The Water Hydraulic Piston Motor With Thrust Plate And Reliability Analysis

According to the present research to water hydraulic components and specialrequirements of deep sea general technique and products, a swash-plate axial waterhydraulic piston motor with floating valve plate based on water lubrication wasdeveloped in this work. Its working pressure is14MPa, output rating torque is12.5Nm, rating speed is1500r/min and volumetric efficiency is greater than80%.Due to the strong corrosive of seawater, it is very important for the selection ofmaterial. Based on the principle of soft-hard material matching,17-4PH was selectedas hard material and two kinds of PEEK was chosen by wear tests as soft material, inwhich wear rate is smaller and friction coefficient is lower.During the structural design of motor, the reliability of the key parts was verifiedby the reliability design theory. Moreover, based on the introduction of AMESim,system simulation of motor was conducted with the help of motorstructure parameters. According to simulation results, clearance and the reason forleakage rate between piston and cylinder were focused in this article. Finally,torque and speed curve were listed on the basis of above studies. The results show thatprototype could meet performance requirements.Finally, comprehensive performance test on prototype was conducted. Theresults show that: The actual displacement was10.6ml/r, which meet requirements ofthe tolerance range of90%~110%compared with theoretical displacement. Thevolumetric efficiency was more than80%when pressure was lower than10MPa, butfar less than80%once pressure exceed10MPa. The main reason was that thestructural manufacturability of slipper was reasonable. So, the next main research isto improve manufacturing process of slipper and conduct reliability life test ofprototype.