Lubrication Characteristic Simulation And Wear Test Of Valve Port Pair Of Seawater Motor With Bionic Non-smooth Surface

The research object of this paper is low-speed and high-torque hydraulic motor lubricated by sea water.In order to improve its performance,it is important to study and design the tribological performance of the valve plate pair.In this paper,the design method of machining pitted bionic non-smooth surface on the surface of motor valve plate is adopted.The concept of bionic non-smooth surface design is to introduce controllable variable elements into the friction system.The regulation of variable parameters in variable elements is an effective way to improve the friction and wear condition of the distribution pair.The research on the influencing factors,mechanism and results of the variable element of bionic non-smooth surface in the friction system of the distribution pair can be used to optimize and improve the performance of the valve plate pair.The valve plate pair of seawater motor plays the role of distribution and bearing.Friction and internal leakage will inevitably occur in the working process.In order to balance friction and leakage,different valve plate pair structures will form different friction types.The influence of bionic non-smooth surface on different friction systems is different,so the residual pressing force type and hydrostatic support type of flow distribution pairs with bionic non-smooth surface are analyzed and studied respectively.Regarding the residual pressing force valve plate pair,the influence of bionic non-smooth surface on the lubrication of smooth contact surface and the distribution process is neglected,and the hydrodynamic support effect of fluid in bionic pit is emphatically analyzed.The parameters of pit and the working condition of motor are optimized with the hydrodynamic bearing performance as the index,and the concave that can produce the hydrodynamic support effect between the residual pressing force valve plate pair of motor is obtained.The distribution of pits.Based on the analysis of lubrication flow field,the friction and wear tests of the residual pressing force distribution pair with bionic non-smooth surface were carried out.The anti-wear and drag reductioneffects of the bionic non-smooth surface were verified by the experiments,and the mechanism of wear behavior in the friction process was explored.The existence of abrasive wear mechanism is determined by experimental study.Therefore,the ability to store debris on bionic non-smooth surface is studied.Based on PDM model,the movement track of particles and the influence factors of particle concentration distribution in bionic pits are simulated and analyzed.The pit type suitable for storing debris between residual pressing type valve plate pairs is selected.For hydrostatically supported valve plate pairs,the lubrication flow field and distribution process of the smooth contact part between the valve plate pairs can not be neglected due to the existence of water film,and the dynamic characteristics of the flow field need to be analyzed.The dynamic grid technology in CFD is used to analyze the transient characteristics of the flow field,which reflects the variation of the flow field when the hydraulic motor works.Through the flow field simulation and analysis of different hydrostatic support type valve plate pairs with bionic non-smooth surface design schemes,the appropriate design scheme was selected.