The Lubrication Simulation Of Piston Ring-liner Systemand Low Friction Designanalysis

Piston ring is one of the important components, which plays an important role inthe process of engine operation.In today’s society, energy problem becomes more andmore serious and reducing friction power consumption becomes the eramainstream.by means of mathematical simulation analysis of the piston ring-linerfriction pair,by changing some parameters to improve the tribological design, so willproduce a great economic benefits.This article basing on the piston movement equation, gas flow equation betweenpiston ring and piston ring dynamics equation, the average Reynolds equation,slightly convex body contact model, lubricating oil film import and export ofboundary conditions and the Archard wear model as the foundation, established themixed lubrication model of piston ring-liner system.In this paper, two methodssolving Reynolds equation-integral algorithm and differential algorithm are analyzed.With two different rings carrier for research we can observe their advantages anddefects in numerical calculation.For a certain type the engine lubrication simulation iscarried out in this paper. Running the program can get the influence of differentfactors,such as the surface roughness, piston ring elastic, lubricating oil viscosity,piston ring type line and so on. The following conclusions are drawn：（1）Integral algorithm is faster compared with the finite difference method；（2）The dependence on piston ring type line of finite difference method issmaller than the integral algorithm;（3）Reynolds boundary conditions are more accurate than half Sommerfeldboundary conditions to determine the oil film border; （4）The effects of roughness on lubrication performance are mainly happenednear the top and bottom dead center. Improving the roughness of top and bottom deadcenter nearby can help improving the lubrication performance;（5）The effect of stretch on friction power consumption is very big. Improvingelasticity helps to reduce the friction loss;（6）Line optimization scheme of piston ring was put forward;（7）Validated using trailing experiment for optimization, the experimentresults show that the optimized piston ring set of mechanical loss is decreasedobviously.