Experimental Investigations About the Power Loss Transition Between Churning and Windage for Spur Gears

Quiban, Romain; Changenet, Christophe; Marchesse, Yann; Ville, Fabrice

doi:10.1115/1.4047949

Cited by 22 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall range of d values for the gear churning curves is d ⊂ false[ 1.30 , 4.05 false]. Under low h false¯ conditions, the gear churning exponent is much larger, which is in agreement with Quiban et al 40 As h false¯ increases, the differences between the discs and gears becomes negligible.…”

Section: Power Loss Resultssupporting

confidence: 84%

“…Table 2 lists the d values for the windage tests within the range [2.77, 3.12] under the label of h = 0. These values agree well with results from Quiban et al 40 For instance, a disc specimen with b = 28.5 mm sees a seven-fold increase in windage P g when Ω is doubled. Yet, windage loss of a gear at Ω = 8 krpm is roughly the same as the churning loss of the same gear at Ω = 2 krpm when it is immersed at h = 1.0.…”

Section: Windage Power Lossessupporting

confidence: 91%

“…They compared their results to the experiments of Petry-Johnson et al 5 and Dawson. 31 Quiban et al 40 performed windage and churning tests of a single spur gear to establish the transition between the two regimes by considering low immersion depths as a crossover of the two and defined a power law torque penalty as a function of surface speed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An experimental investigation of windage and oil churning power losses of gears and discs

Handschuh

Guner

Kahraman

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

This study presents comparable sets of churning and windage power loss measurements of a gear. Measurements are performed under windage (air only) and churning (immersion in oil up to a certain level) to quantify load-independent power losses of a family of spur and helical gears along with representative discs. Aiming at quantifying the impact of gear geometry on churning or windage losses to establish a baseline for the case of no enclosures around the gear, the test matrix is designed to investigate three key items: (a) contribution of losses along the periphery and faces, (b) the influences of gear teeth versus a toothless replacement disc as well as key design parameters (gear module and helix angle), and (c) a comparison of churning and windage power losses measured from the same exact set-up. The churning power losses are shown to increase with the static oil levels due to increased solid-fluid interactions. The impact of oil bath temperature (oil viscosity) on churning loss is observed to be more pronounced for higher oil levels. The presence of gear teeth on the rotating specimen (spur or helical) cause churning loss to increase modestly in comparison to the disc specimens. Furthermore, a larger tooth size results in higher churning power losses. The influence of gear teeth (gear vs. disc) on windage loss is shown to be significant, indicating that modeling a gear in a high-speed windage condition as a cylindrical disc might not be an acceptable practice.

show abstract

Section: Power Loss Resultssupporting

confidence: 84%

Section: Windage Power Lossessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An experimental investigation of windage and oil churning power losses of gears and discs

Handschuh

Guner

Kahraman

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…Two common lubrication methods are splash lubrication and oil jet lubrication. The no-load losses of dipped lubricated gears mainly include fluid trapping and squeezing power losses, and churning power losses [4][5][6][7]. For jet-lubricated gears, there are other losses-impulse power losses and windage power losses, without churning losses [8,9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Wetting Behaviors of an Oil Jet Lubricated Spur Gear

et al. 2022

View full text Add to dashboard Cite

As it is widely employed in the aeronautical transmission system, a better understanding of the oil jet lubrication behavior is vital to determine the total system energy consumption. Firstly, this study presents related theoretical models such as the sum of oil jet resistance torque, impingement depth, and wetted area of the oil film for calibrating the physical characteristics of the impact of the oil jet on the gear flank. Then, in terms of the flow phenomenology of the liquid column for the oil jet impact on an isolated spur gear, a detailed transient and spatial flow field analysis becomes available, benefiting from an overset mesh method integrating with a volume-of-fluid (VOF) method. Furthermore, not only the oil jet resistance torque, but also the impingement depth as well as the spatial and temporal evolution of wetted surface by the oil film on the gear tooth given by numerical investigations were compared well with the theoretical calculations.

show abstract

“…Detailed investigations on the windage phenomena for high-speed and injection lubricated gearboxes were carried out by Maurer [31]. Recent experimental studies by Quiban et al [39] investigated the transition between churning and windage with respect to spur gears. Here, the authors determine a strong interaction of the predominant air flow with the oil sump that influences the power loss of the gearbox.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis on the oil flow of a gear stage with guide plate

Hildebrand

Dangl

Sedlmair

et al. 2021

Forsch Ingenieurwes

View full text Add to dashboard Cite

Gearbox housing geometry and oil guide plates strongly influence gearbox oil flow and interaction of oil with machine elements. Guided oil flow can increase gearbox efficiency and improve heat management. Recent research studies have demonstrated the potential of Computational Fluid Dynamics (CFD) simulations to predict the gearbox oil flow and no-load losses. Thereby, the influence of housing geometry and guide plates has rarely been addressed. This study focuses on a CFD analysis on the oil flow of a dip lubricated spur gear stage with a guide plate. Grid-based CFD models with different simulation setups were confronted and evaluated. Results show that the selection of the simulation setup with respect to the acceleration ramp and mesh size needs to address the considered object of investigation and the desired depth of information. An appropriate simulation setup shows great accordance with recordings of the oil distribution by a high-speed camera. A detailed analysis of the simulation results identified the contribution of different gear surface zones to the no-load gear loss torque. For the considered guide plate a strong interaction of oil flow and loss torque due to pressure forces on the tooth flank surface zones and due to shear forces on the front and tip circle surface zones of the gears was determined.

show abstract

Experimental Investigations About the Power Loss Transition Between Churning and Windage for Spur Gears

Cited by 22 publications

References 30 publications

An experimental investigation of windage and oil churning power losses of gears and discs

An experimental investigation of windage and oil churning power losses of gears and discs

Numerical Analysis for Wetting Behaviors of an Oil Jet Lubricated Spur Gear

CFD analysis on the oil flow of a gear stage with guide plate

Contact Info

Product

Resources

About