| As one of the key parts of the diesel engine, the connecting rod bushing bears high mechanical loads during its operation. Under the condition of large load, heat load and high-strength friction, its work condition become worse. Good lubrication performance is the key to insure proper operation of the connecting rod bushing, Research on the lubricating property of connecting rod bushing has important theoretical significance and practical value.From the kinematics and dynamics of crank and connecting rod mechanism, this paper develops the piston’s formulas of displacement, speed and acceleration. By the analysis of gas forces suffered by connecting rod bushing and reciprocating inertia forces, the external load that suffered by connecting rod bushing can be deduced.The paper makes a study of the formation process and mechanism of the connecting rod bushing hydrodynamic lubricant film and develops the Reynolds equation that is suitable for connecting rod bushing hydrodynamic lubrication. Through the analysis of several boundary conditions, the Reynolds boundary condition is chosen. Besides, this paper develops the formulas of the film carrying capacity, the friction, the oil flow are suitable for the connecting rod bushing.This paper employs the finite difference method to study the performance of connecting rod bushing, in the condition of considering the elastic deformation of connecting rod bushing, a coupling algorithm is developed. The finite difference method is applied to numerically solve the problem of the pressure distribution in the oil film and the elastic deformation of connecting rod bushing.By calculating a diesel engine connecting rod bushing with and without considering the effect of elastic deformation are studied and analyzed in detail. The analysis results show that the influences of elastic deformation of bearing on the performance of connecting rod bushing should no longer be neglected, especially in the case of high eccentricity ratio. |
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