Tribological Design Of Metal Spherical Plain Bearing

With the development of the domestic large aircraft industry,the demand for high-quality,high-reliability spherical plain bearings is very urgent in the important departments of aerospace,defense and military.As a kind of sliding bearings with a spherical friction pair,the problems of static contact,frictional heat,and wear of the bearing will directly affect its performance and life.Therefore,the study of its tribological properties is conducive to the design of long-life and high-performance bearings.In this thesis,tribological problems such as static contact,frictional heat and wear of spherical plain bearings were studied in order to guide the design and application of spherical plain bearings in engineering practice.The main work and conclusions of this thesis are as follows:The static finite element analysis of WMLS17 R bearing under three different working conditions was carried out using ANSYS Workbench,and then the influence of structure of groove on end face on stress concentration was studied.Finally,the static finite element analysis of KF11028 bearing under normal and skew conditions was carried out.The results show that the stress concentration appears at bottom of groove on end face under limit load,and the equivalent stress value there is greater than yield strength of material.The maximum equivalent stress and maximum contact stress of the bearings under combined load are larger than those under pure radial load.The thermal-mechanical coupling finite element analysis of WMLS17 R bearing under three different working conditions was carried out.The temperature field,equivalent stress field and contact stress field of the bearing were analyzed.The results show that the friction temperature rise under combined load is larger than that under pure radial load,and the friction temperature rise under inclined position is larger than that under normal position.An asperity model of the spherical plain bearing was established,the steady-state temperature rise of the asperity contact zone under elastic contact and plastic contact were calculated.And then the temperature rise under different angular velocities and loads was examined.Finally,the maximum flash temperature maps of the asperity in two different types of spherical plain bearings were calculated and drawn.The results show that the temperature rise of the asperity in contact zone is symmetrically distributed,and the temperature rise at the trailing edge of the outer ring is greater than that at the leading edge.WMLS17 R bearings are more prone to thermal problems than P26090B-G bearings.The finite element analysis of sliding wear of WMLS17 R bearing was carried out based on the Archard wear law.The contact stress and wear depth of the outer spherical surface of the inner ring under a load of 30 k N and a cycle number of 10,000 times were studied.The results show that the wear depth at the center point of the contact surface is the largest with a value of 0.017 mm.And the wear depth of the center point increases with the increase of the load and the number of cycles.