Research On The Non-ewtonian Lubrication Performance Of Rod Bushing

As one of the key sub-friction in the internal combustion engine, rod bushing bears altern ating loads and thermal stress during engine operation, so rod bushing wears very serious in p ractical working conditions, especially toward the trends of high-speed and high explosive in t he current internal combustion engine design, which make operating conditions of the rod bus hing even more severe. So it is quite significant to study lubrication properties of the rod bush ing to ensure lubrication environment of the rod bushing.Firstly, the external load of rod bushing was deduced from the perspective of crank rod k inematics and dynamics. Then the Carreau rheological model was chosen as the simulation m odel in this paper. Considering the possibility of calculation, the non-Newtonian lubricants Re ynolds equation was derived by using the isotherm sliding contact bearings lubrication. And t he reasonable formulas for carrying amount of the film, friction and lubricant flow of the rod bushing were also derived herein. Then the derived Reynolds equations were processed to be dimensionless, and Reynolds equation is also solved using the finite element difference metho d, the resulted linear equations were iterative solved by over-relaxation iterative method. Matl ab software was used to programme required procedures. A kind of diesel engine was taken as the study model in this paper. Comparing the calculated results by using non-Newtonian assu mption derived Reynolds equations with the results calculated by classical Reynolds equation s, the influence of the eccentricity on the lubrication properties of the rod bushing after consid ering the impact of non-Newtonian was computed. In conclusion, the influence of non-Newto nian characteristics of the lubricant on the lubricity should be considered.