Study On The Lubrication Performance Of Spherical Journal Bearing With Regular Micro-texture On The Surface

The spherical journal bearing is widely used in mechanical engineering.It is a new way for improving the lubrication performance to making micro-texture on the lubricating surface.However,the research of spherical journal bearings with regular micro-texture is not enough in the past.In this thesis,spherical journal bearings with regular micro-texture are taken as the research object.The influence of micro-texture surface on the lubrication performance of spherical journal bearings is studied by numerical calculation and experiment.The main contents and achievements of this thesis include:the force analysis of spherical journal bearing with different shapes of surface texture.Based on the theory of lubrication,the lubrication mechanics model of three kinds of ball heads is established with considering the geometrical condition.Based on the numerical calculation method and the specific examples,the geometrical parameters of the spherical bearing with smooth,with asperity and micro-triangular are studied and compared.The influence curves of texture parameters,ball eccentricity and rotational speed on lubrication performance are obtained and analyzed.The performance of the spherical bearing with cylindrical surface texture,triangular cylindrical surface texture and square cylindrical surface texture is numerically studied.The influence curves of texture parameters,ball eccentricity and rotational speed on the lubrication performance of the ball are obtained and analyzed.Based on the principle of optical interferometry,a test device for the lubrication performance of ball-plate friction is developed,and the processing,installation and commissioning of the test device are completed.The distribution of the lubricating oil film thickness under the different lubrication conditions,different speed and different load is measured and analyzed.The research contents and achievements of this thesis can provide theoretical support for the application and further research on the lubrication performance of spherical journal bearings with regular micro-texture surface.