The black substance on the connecting rod smallend was analyzed.It is found that the black substance is produced by high temperature,and the high temperature is caused by friction between connecting rod smallend,piston and piston pin.In order to study the lubrication of the connecting rod smallend,the finite element model of piston,piston pin and connecting rod smallend were established,and the degree of freedom is reduced.EHD model of connecting rod smallend was built to study oil film pressure and thickness,asperity contact pressure and oil flow.It is found that the poor flow of lubricating oil is the main cause of the blackening and discoloration of bushing.The comprehensive improvement measures for matching the hole contouring of rod smallend and and adjusting the stiffness of the piston pin were put forward.The results show that the maximum rough contact pressure can be reduced and the lubrication can be improved by using the rod smallend bush after matching hole contouring and increasing the stiffness of piston pin.
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张忠伟,王根全,张利敏,宋现浩,赵志强.发动机连杆小头轴承弹性流体动力润滑分析[J].润滑与密封,2018,43(12):115-123. . Elastohydrodynamic Lubrication Analysis of Rod Smallend Bearing of Engine[J]. Lubrication Engineering,2018,43(12):115-123.