Abstract
Power loss analysis of gear transmission in a transmission system is of great significance to improve the efficiency of the power system, and load-independent power losses are an important part of the power losses of gear transmission. Based on the computational fluid dynamics (CFD) method, the hydrodynamic models of internal and external gear pairs are established. By analyzing the pressure field and the velocity field, the windage and squeezing power losses and the pressure and viscous power losses, the influence of rotation speed and tooth width on flow field characteristics, and load-independent power losses of internal gear pair are studied. In addition, we compare the flow field characteristics and the load-independent power losses between external and internal gear pairs and discuss the difference between them. The results show that the pressure and fluid velocity in the meshing area of the gear pair are greatly affected by rotation speed and tooth width, and the load-independent power losses increase with the increase of rotation speed and tooth width. At the same rotation speed, the transmission ratio and number of teeth, windage, and squeezing power losses of the external gear pair are smaller than those of the internal gear pair. Compared with the internal gear pair, the external gear pair has more advantages in controlling the load-independent power losses. The difference of the load-independent power losses of the two meshing modes mainly comes from the viscous power losses of the wheel gear of internal gear pair. This paper provides a basis for the selection of the gear meshing mode and the analysis of load-independent power losses of the transmission system.
Highlights
Power loss analysis of gear transmission in a transmission system is of great significance to improve the efficiency of the power system, and load-independent power losses are an important part of the power losses of gear transmission
We compare the flow field characteristics and the load-independent power losses between external and internal gear pairs and discuss the difference between them. e results show that the pressure and fluid velocity in the meshing area of the gear pair are greatly affected by rotation speed and tooth width, and the load-independent power losses increase with the increase of rotation speed and tooth width
Compared with the internal gear pair, the external gear pair has more advantages in controlling the load-independent power losses. e difference of the load-independent power losses of the two meshing modes mainly comes from the viscous power losses of the wheel gear of internal gear pair. is paper provides a basis for the selection of the gear meshing mode and the analysis of load-independent power losses of the transmission system
Summary
Qing-liang Zeng ,1,2 Zhi-yuan Sun ,1 Li-rong Wan ,1 Yang Yang ,1 Han-zheng Dai ,1 and Zhi-kuan Yang. By analyzing the pressure field and the velocity field, the windage and squeezing power losses and the pressure and viscous power losses, the influence of rotation speed and tooth width on flow field characteristics, and load-independent power losses of internal gear pair are studied. Ere is little research on an internal gear pair, and there is no analysis of the influence of external and internal meshing modes on the load-independent power losses, which greatly limit the establishment and improvement of the model of load-independent power losses. Erefore, in this paper, the influence of rotation speed and tooth width on the flow field characteristics and loaddependent power losses of an internal gear pair is studied by using the computational fluid dynamics method. According to the structural size of a transmission, the computational domain size is determined to be φ160 mm × 80 mm. e external and internal gear pairs with the same transmission ratio and number of teeth are selected. e geometric parameters of gear pairs are shown in Table 1. e meshing clearance of a normal meshing gear pair is very small, which is not conducive to the mesh of the
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