Abstract:With engine sliding bearings as the research object,considering the journal tilting problem and the bearing mounting in the crankcase during the actual bearing installation process,the full constraint and local constraint models of the engine main bearing were established.Considering the relationship between the actual bearing bush and the bearing seat comprehensively,two conditions of full restraint and installation contact were established.The deformation matrix method was used to calculate the radial deformation of the bearing bush.Considering the inconsistency between finite element mesh and finite difference mesh density,the radial deformation of each node was substituted into the corresponding finite difference mesh node by twodimensional interpolation method.The effect of elastic deformation on the lubrication performance 〖JP3〗parameters of the sliding bearing was analyzed.The results indicate that the maximum oil film pressure of the bearing is reduced 〖JP〗after considering the elastic deformation of the bearing bush,and the minimum oil film thickness increase is smaller.As the eccentricity increases,the end discharge flow,bearing capacity,and working torque of the bearing are increased when considering the elastic deformation of the bearing bush.With the increase of the rotating speed,the oil film pressure,end discharge flow,bearing capacity and working torque are reduced when considering the elastic deformation of the bearing bush.