Experimental Investigations to Use Splash Lubrication for High-Speed Gears

Neurouth, Adrien; Changenet, Christophe; Ville, Fabrice; Octrue, Michel; Tinguy, E.

doi:10.1115/1.4036447

Cited by 31 publications

(20 citation statements)

References 12 publications

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“…the immersion depth, the density of the fluid, and the rotational speed. Oil aeration also has to be considered particularly in high-speed applications [30]. Mauz [31] developed an empirical calculation method in order to predict the churning loss torque TLG0,C.…”

Section: Power Loss Types For Injection Lubricationmentioning

confidence: 99%

Efficient lubrication of a high-speed electromechanical powertrain with holistic thermal management

Morhard

Schweigert

Mileti

et al. 2020

Forsch Ingenieurwes

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In order to increase the power density of BEVs (Battery Electric Vehicles), high-speed concepts are being progressively developed. With increased speed, the power of the electrical machine can be maintained with reduced torque and therefore size, resulting in cost and package advantages. In the joint research project Speed4E with seven industrial and five university partners, such high-speed electromechanical powertrain is being developed and investigated. The electrical machines will run at a maximum rotational speed of 50,000 rpm in the test rig and 30,000 rpm in the test vehicle. The developed lubrication system for the Speed4E transmission aims for high efficiency and optimized heat balance, via a demand-oriented oil flow. In this context, this study investigates how an efficient lubrication system can be designed with respect to the holistic thermal management of the vehicle. Therefore, a hybrid lubrication consisting of dip and injection lubrication is realized. For the analysis and evaluation, efficiency calculations and CFD (Computational Fluid Dynamics) simulations of the oil distribution are presented.

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Section: Power Loss Types For Injection Lubricationmentioning

confidence: 99%

Efficient lubrication of a high-speed electromechanical powertrain with holistic thermal management

Morhard

Schweigert

Mileti

et al. 2020

Forsch Ingenieurwes

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“…Splash lubrication [2][3][4] is widely used in intermediate gearboxes on account of its simplicity and reliability. Significant energy losses occur in the intermediate gearbox during operation, most of which are dissipated as heat.…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Investigation of Lubrication and Temperature Characteristics of an Intermediate Gearbox with Splash Lubrication

Wang

Wei

et al. 2020

Applied Sciences

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In this study, we propose a computational fluid dynamics (CFD)-based method to study the lubrication and temperature characteristics of an intermediate gearbox with splash lubrication. A volume of fluid (VOF) multiphase model was used to track the interface between oil and air. A multiple reference frame (MRF) model was adopted to accurately simulate the movement characteristics of the gears, bearings, and the surrounding flow field. The thermal-fluid coupling computational model of an intermediate gearbox with splash lubrication was then established. Combined with experimental results, we verified that the lubricating oil temperature was below the limit requirement (<110 °C). The numerical results revealed that large amounts of lubricating oil were splashed onto the tooth surfaces near the gear meshing area. A large convective heat transfer coefficient corresponds to a low gear tooth surface temperature. The tooth surface temperature of the driving gear is higher than that of the driven gear. The distribution law of oil volume fraction of the bearing roller was jointly affected by the roller rotation direction and gravity. The convective heat transfer coefficient of the roller wall was largely related to the lubrication environment of the roller, including the oil distribution inside the bearing cavity and the flow rate.

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“…11 have measured churning torque of spur and helical cylindrical gear, single or meshed. The influence of flanges 20,21 and oil aeration 22 on torque have also been investigated. Recently, Polly et al.…”

Section: Introductionmentioning

confidence: 99%

Churning losses of spiral bevel gears at high rotational speed

Quiban

Changenet

Marchesse

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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In the present study, no-load losses of different splash lubricated spiral bevel gears were measured. The authors used a specific test rig, and a set of gears, to investigate churning losses at higher tangential speeds: up to 60 m/s. An uncommon behavior of the drag torque was highlighted: the torque increased with the rotational speed until a local maximum was reached; then the torque decreased and a local minimum was noticed; at higher rotational speed the torque increased. The torque decrease seems to be linked with a windage phenomenon, which becomes non-negligible at such speeds. In this work, efforts were made to characterize this reduction of gear immersion depth in order to be able to predict no-load losses. It was found that the evolution of oil immersion was linked to a Froude number. Finally a new analytical model of no-load losses was developed for churning losses combined with windage effects. This formulation takes into account several parameters such as rotational speed, gear immersion depth, oil properties, and gear geometrical parameters.

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Experimental Investigations to Use Splash Lubrication for High-Speed Gears

Cited by 31 publications

References 12 publications

Efficient lubrication of a high-speed electromechanical powertrain with holistic thermal management

Efficient lubrication of a high-speed electromechanical powertrain with holistic thermal management

CFD-Based Investigation of Lubrication and Temperature Characteristics of an Intermediate Gearbox with Splash Lubrication

Churning losses of spiral bevel gears at high rotational speed

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