Research On Friction Lubrication Performance Of Groove Type Cylinder-piston Ring

Energy crisis and environmental pollution are two big problems in our society. Considering theenergy consumption and exhaust emission from cars is closely related with the friction lubricationof internal combustion engine, especially the cylinder liner-piston ring friction pair, it should notonly reduced the friction loss and improve the lubrication performance but also control the oilconsumption and meet the emissions requirements. Therefore, it is always the key point of theresearch.Cylinder liner-piston ring is one of the most important friction pairs of internal combustionengine. It works under high temperature, high pressure and high load condition, the stand or fall ofits lubrication performance affects the working efficiency and the use performance of the internalcombustion engine directly.There are more stringent requirements in energy consumption and exhaust emission of internalcombustion engine with the increasingly high demand for energy conservation and environmentalprotection. The requirements are reflected on the frictional lubrication performance of cylinder liner-piston ring indirectly and the frictional lubrication performance is associated with the surfacetopography characteristic in a great degree，therefore, the study of influence between the surfacemorphology characteristic of cylinder liner-piston ring and its frictional lubrication performance isvery important.The paper takes the engine cylinder liner-piston ring friction pair of internal combustion as theresearch object to study the friction and lubrication properties by combing theoretical analysis andnumerical calculation. It mainly studied the surface roughness and groove type texture on theinfluence of friction lubrication performance, set up cylinder liner-piston ring friction lubricationmodels which considering the surface roughness and the groove type, and then made numericalcalculation, analysis and contrast show the influence of oil groove on friction lubrication. Theresults showed that the groove storage function of oil can improve the friction lubricationperformance, especially near the top dead center, improve the lubrication performance and reducethe friction and wear greatly. The specific research analysis includes the following aspects:1. To be familiar with the basic concepts and basic equations of hydrodynamic pressurelubrication, and then derived basic Reynolds equation through the Navier-Stokes equation andcontinuity equation.2. On the basis of the Reynolds equation, introducing the pressure flow factor and shear flow factor through the analysis of the characteristics of rough surface topography to set up cylinder liner-piston ring friction lubrication model which considering the surface roughness.3. Solving the cylinder liner-piston ring lubrication model which considering the surfaceroughness by using the finite difference method to discrete equation, iterative method, and theReynolds boundary conditions. The results showed the relationship of the minimum film thicknessratio, most membrane stress, friction and friction power consumption along with the crank shaftangle.4. In combination with the processing technology of the cylinder liner, considering the groovetype surface texture on the influence of friction lubrication and then building the groove typecylinder liner-piston ring lubrication model on the basis of the cylinder liner-piston ringlubrication model which considering the surface roughness.5. Solving the groove type cylinder liner-piston ring lubrication model by numerical solutionand making comparison with the results of surface roughness lubrication model. It concluded thatgroove oil storage effects on the properties of cylinder liner piston ring friction lubrication.6. In order to suit the requirements of energy conservation and reduce the friction and wear, itputs forward some feasible suggestions which combined with the results of model analysis.