Abstract
A radial thrust hydrodynamic sliding bearing (RTHSB) with special shaped cavity had been designed. Taking the instantaneous temperature rise characteristics of RTHSB as an analysis object, considering the influence of inlet lubricating oil velocity and transmission shaft speed, a dynamic simulation method of variable viscosity temperature field is proposed, and the mathematical model of instantaneous temperature rise of time-varying oil film is constructed. The correlation equation between instantaneous temperature rise and oil film variable viscosity is analyzed, the lubricating performance of a special-shaped cavity with variable thickness of the oil film considering real-time full operating conditions is revealed, and the alternating transient laws of oil film thickness with variable viscosity and its instantaneous temperature rise for no-load, heavy-load, and different rotating speeds are studied. It is obtained that the higher temperature area of profiled shaped cavity on reverse flow side extends to oil seal side with increase of rotating speed. The dynamic simulation of variable viscosity of RTHSB with different film thickness is simulated by using FLUENT software and the trend of transient film temperature field distribution of in special-shaped cavity is evaluated. The rationality of the mechanism analysis and numerical simulation results in this paper has been verified.
Highlights
Optimal lubrication performance of a radial thrust hydrodynamic sliding bearing (RTHSB) is the core content of improving the high-precision manufacturing accuracy and process efficiency of modern machinery’s large load and high-precision manufacturing
The fluid instantaneous velocity in special shaped cavity changes in real time and the contact surface friction makes the oil film thick-ness or thin or thick dynamic time-varying, which affects the machining accuracy of the RTHSB and the steady viscosity and temperature characteristics for lubricating oil
The analysis of RTHSB focuses on steady state, and there is little research on time-varying transient oil film with variable viscosity
Summary
Optimal lubrication performance of a radial thrust hydrodynamic sliding bearing (RTHSB) is the core content of improving the high-precision manufacturing accuracy and process efficiency of modern machinery’s large load and high-precision manufacturing. The fluid instantaneous velocity in special shaped cavity changes in real time and the contact surface friction makes the oil film thick-ness or thin or thick dynamic time-varying, which affects the machining accuracy of the RTHSB and the steady viscosity and temperature characteristics for lubricating oil. High speed in operating conditions is set to 80 rpm, and film thickness is set in the range of 70 to 100 mm, when the inlet flow rate becomes smaller, the oil temperature at the contact interface of the oil pad edge is higher. When the thickness of oil film is not greater than 0.07 mm, the inlet flow rate increases and the oil cushion edge temperature increases rapidly
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