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The distribution of lubricating oil in the bearing cavity is of great significance to bearing lubrication and cooling. A new idea is provided to further study the ball bearings lubrication, to achieve effective lubrication of bearings. The flow field of oil injection lubrication ball bearings is studied by the moving particle semi-implicit (MPS) method. The accuracy of the numerical calculation method is verified by experiments. The oil distribution of the bearing lubrication flow field and churning torque of the ball and cage at different speeds are analyzed. The research results show the maximum oil content in the bearing cavity is distributed in the range of about 90° to 120°. As the increase of rotating speed, the number of particles in the bearing cavity decreases. The churning torque decreases with the increase of rotating speed and increases with the increase of the oil viscosity. This study provides a new numerical calculation method for the lubrication flow field of ball bearings.

The distribution of lubricating oil in the bearing cavity is of great significance to bearing lubrication and cooling. A new idea is provided to further study the ball bearings lubrication, to achieve effective lubrication of bearings. The flow field of oil injection lubrication ball bearings is studied by the moving particle semi-implicit (MPS) method. The accuracy of the numerical calculation method is verified by experiments. The oil distribution of the bearing lubrication flow field and churning torque of the ball and cage at different speeds are analyzed. The research results show the maximum oil content in the bearing cavity is distributed in the range of about 90° to 120°. As the increase of rotating speed, the number of particles in the bearing cavity decreases. The churning torque decreases with the increase of rotating speed and increases with the increase of the oil viscosity. This study provides a new numerical calculation method for the lubrication flow field of ball bearings. [ABSTRACT FROM AUTHOR]

The CFD (Computational Fluid Dynamics) method is used to calculate the external churning torque of the hydraulic torque converter, and an experiment system is developed to validate. The influence of oil level and viscosity and rotation speed is analysed. The boundary layer thickness is calculated. A method of adding fairing to reduce churning torque is proposed. The results show that the churning torque increases with increasing rotation speed, oil level and viscosity. For three sets of curves, the errors are respectively 5.83%, 10.99% and 11.8%. Oil level affects the churning more than oil viscosity and rotation speed. Its increment dimensionless number is 1.17. Adding fairing reduces the churning torque by up to 80.45%. The streamlines become more orderly and regular, and wall shear reduces much. There is a large resistance torque of the pump when it starts. And the resistance torque decreases with the reduction of oil. [ABSTRACT FROM AUTHOR]