On windage losses in high-speed pinion-gear pairs

Application of an unstructured overset method for predicting the gear windage power losses

“…center distance is 305 ∼ 310 mm) is large, the overall losses are nearly equal to or slightly less than the sum of the spur gear 1 and the disk. Some degree of airflow interaction contributes to pushing the other wheel, thus reducing a small fraction of air resistance mainly caused by pressure effect and the overall power losses, this is in line with the measurement by Ruzek et al (2019b).…”

“…The spindown test rig used by Ruzek et al (2019aRuzek et al ( , 2019b consists of right and left shafts connected with an electric motor by a transmission shaft, belts and pulleys. The test gears or disks are mounted at the free end of the shafts and the other end are driven by timing belts so that the reverse parallel shaft is identified with the parallel shaft of the meshing gear pair.…”

“…As shown in Figure 3, numerical predictions of the windage losses for an isolated disk or spur/helical gear defined in Table 1 are compared with experimental data given by Ruzek et al (2019b) and Diab et al (2004). For the sake of the verification of the overset method, the results from empirical formulas (Diab et al, 2004;Voeltzel et al, 2016) are also superimposed in Figure 3.…”

“…An experimental and numerical analysis was executed by Massini CONTACT X. Zhu zhuxiang2017@csu.edu.cn et al 2018for a spinning spur gear in a specific environmental that pressure and temperature conditions allowed to be preset and monitored, moreover, the particle image velocity technique with the fitted optical accesses in the test rig provided reliable results of the flow field provoked by the rotating gear, achieving good agreement with the computational results replicated the experimental conditions. The majority of the experiments and numerical models addressed the windage losses of an isolated gear, Ruzek et al (2019aRuzek et al ( , 2019b) designed a unique spin-down test rig which can measure both the losses of an isolated gear or a non-meshing gear pair, and conclude that each member of a non-meshing gear pair changes the airflow surrounding the gear. Recently, Arisawa et al (2019) modeled windage loss and oil dynamic loss to deduce equations for losses estimation, meanwhile, the validity of the developed model was demonstrated by experiments.…”

Estimation of loss factor based on the load share model in improved bending strength spur gear drive system

“…The method incorporated includes friction in their prediction and explained the effects of scoring and contact failure in the gear efficiency of the drive. The estimation of windage power losses in the early stages to the most recent studies 2–10 predicted that the major amount of losses occur in the teeth of the gears. These losses in the gearbox account for the decline in the efficiency of the system which is due to the load-dependent losses 11–14 that includes the combinational effect of the sliding and rolling between the gear teeth.…”