Characteristics of internal flow field and convection heat transfer in planetary gear reducer of shield machine

Abstract

Based on RNG k-ε turbulence model and dynamic grid technology, the internal fluid dynamics model of splash lubrication three stage planetary gear reducer system is established. The distribution of lubricating oil and convective heat transfer characteristic in the system at different input rotational speeds are analyzed. The results show that at high speed condition, the oil gas mixing volume and the degree of atomization of lubricating oil are higher, and the convective heat transfer coefficient of tooth surface is larger, and it takes less time for the convective heat transfer coefficient to reach equilibrium. Meanwhile, the mean convective heat transfer coefficient on the tooth surface of sun gear, planetary gear and ring gear decreases successively.

Thermodynamic Modelling for Heat Analysis and Prediction in Precision Transmission Systems: A Focus on Gear Operation

“…Consequently, it is deemed imperative to undertake a thorough analysis of thermal distribution and fluctuations in gears, thereby furnishing critical data support for the purposes of system design, optimization, and maintenance [22,23]. The precision in predicting temperature variations within gears is crucial, as it facilitates timely and accurate control during system operation, thereby enhancing transmission efficiency and mitigating the likelihood of system failures [24].…”