Design And Experimental Study Of Wear-resistant & Seal Bionic Structure In Internal Combustion Engine Piston Ring Surface

Internal combustion engine provides power support for traditional industrial products.In recent years,due to the continuous reduction of oil and mineral resources,the development of internal combustion engine industry tends to be highly efficient,energy saving and practical.The piston ring and cylinder system as the core power input and output of the internal combustion engine,the friction power consumption of the working process of internal combustion engine friction power consumption accounted for about 50%,but also directly affect the fuel efficiency of energy transfer during the combustion performance of piston ring seal,the performance directly affects the system's internal combustion engine fuel consumption,the overall stability and service life.Therefore,it is very important to improve the wear and seal performance of the piston ring and cylinder liner to improve the overall working efficiency of the internal combustion engine.By analyzing the working principle of piston ring and cylinder liner and the temperature field and force under actual working conditions,a bionic grooved piston ring group with better wear resistance and sealing performance is designed.Taking the piston ring group of Volkswagen EA211 1.4L 66kW MPI engine as the research object,with the choice of groove depth,groove width and groove spacing as experimental factors,27 kinds of bionic grooved piston ring finite element analysis models are established by orthogonal polynomial regression analysis method.The use of ANSYS Workbench software on the standard piston ring group and bionic grooved piston ring group were thermal structural coupled finite element analysis and solving the outer surface and the opening stress distribution,discuss the effect of the piston ring groove shape surface group structure on the wear resistance and sealing performance.Through the surface of the piston ring group,finite element analysis of the stress distribution shows that the external surface of the piston ring is the maximum stress value appeared at the opening of the opposite ring on the piston,piston ring groove surface bionic structure can effectively reduce the external surface of the piston ring stress concentration,reduce the piston ring group surface stress value,so as to improve the piston ring group wear resistance.The bionic grooved piston ring wear resistance influence factors from large to small is as follows:the width of the groove depth of the groove groove spacing,the groove depth is 3mm,the groove width 0.1mm,groove spacing 0.1mm bionic piston ring surface stress is the biggest,the best wear resistance.The piston ring group first gas ring and second gas ring opening of finite element analysis of the stress distribution shows that the bionic grooved piston ring group first gas ring opening stress presents more stress concentration phenomenon,at the edge of the groove shape bionic structure also has the stress concentration;the bionic piston ring group second gas ring opening stress shows the regional stress concentration phenomenon in the inner ring groove,the port surrounding stress is small,piston ring opening and ring groove inner stress can keep relatively stable,prevent the cylinder internal gas of high temperature and high pressure due to produce large gap of piston ring and inner ring groove between the inner wall of the leakage.In order to improve the sealing performance of the piston ring group.Influence of sealing performance of the bionic grooved piston ring group first gas ring from large to small factors:the width of the groove groove spacing groove depth,trench depth is 1mm,the width of the groove is 0.5mm,groove spacing of 0.1mm bionic groove shaped first gas ring sealing performance is best;the bionic grooved piston ring group second gas seal performance from big to small of the factors as follows:the depth of the groove groove spacing groove width,groove depth is 3mm,the width of the groove is 0.5mm,groove spacing of 0.2mm bionic grooved gas ring sealing performance of the best second.In order to verify the bionic grooved piston ring wear and sealing performance,this paper design and build the piston ring wear and sealing performance test,on the part of the bionic grooved piston ring friction experiment and static seal test,get trench depth of 3mm,the groove width is 0.1mm and groove spacing of bionic grooved piston 0.1mm ring average the minimum friction,the drag reduction rate is 19.63%,the maximum drag reduction rate,the best wear resistance,and the thermal structure coupling finite element analysis results;groove depth is 1mm,the groove width is 0.5mm and groove spacing of 0.1mm bionic grooved piston ring group can effectively slow down the piston top gas leakage rate of 55.26%,the best sealing performance.