Experimental Investigation of Spur Gear Efficiency

Petry-Johnson, T. T.; Kahraman, Ahmet; Anderson, N. E.; Chase, D.

doi:10.1115/detc2007-35045

Cited by 28 publications

(35 citation statements)

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“…The oil and airflow related losses are contributing to the socalled load-independent spin power losses which include the air windage, oil churning, inertial power loss from an impinging oil jet (for the case of jet lubrication), fluid trapping and squeezing between meshing gear teeth, rotating seals, and bearings [2]. Further discussion on importance of these losses can be found in several recent works devoted to the gearbox efficiency [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of multiphase flow in a model gearbox

Chernoray

Jahanmiri

2011

WIT Transactions on Engineering Sciences

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This study concerns dynamics of a two-phase flow around a rotating solid body. Under consideration is a model of a gear wheel in a gearbox which rotates and is partially submerged in oil. The flow of interest is complex and involves effects of free surface dynamics, rotation, and formation of bubbles and drops. Occurring flow regimes include laminar, transitional and turbulent. The major focus of the investigation is on details of the developed flow, and the purpose is validation of numerical methods developed for design and optimization of such components. Current experiments are performed in a test rig which is modelling a generic simplified gearbox with a single isolated rotating wheel. The flow measurements are carried out by using particle image velocimetry (PIV) and the test rig is specially designed for this purpose with the optical access maximized. The flow similarity with respect to a real gearbox is fully maintained and the working fluid is a transparent mineral oil. The PIV measurements are performed at four different rotation speeds for two different wheel configurations in order to cover a spectrum of operational conditions needed for numerical modelling. The emphasis is on the result of experiments on a smooth wheel. The measurements are providing velocity distribution around the wheel and details on bubble and drop distribution.

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Section: Introductionmentioning

confidence: 99%

Experimental study of multiphase flow in a model gearbox

Chernoray

Jahanmiri

2011

WIT Transactions on Engineering Sciences

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“…To improve the rolling contact performances in these aspects, the surface polishing process that eliminates the local roughness peaks has been shown to be a successful method [1,[17][18][19][20][21]. The reduced roughness amplitude results in a more continuous lubrication film, decreasing the possibility of asperity contacts.…”

Section: Background and Motivationmentioning

confidence: 99%

The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

Parmar

2018

Journal of Tribology

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This study investigates the effects of the micro-dimple texture on the friction and surface temperature performances of a ball-on-disk contact, operating under the speed and load ranges that cover typical gearing applications. Circular shaped micro-dimple arrays with different dimple center distances and dimple depths are implemented on the ball surface to quantify the impacts of these two parameters on the friction coefficient and the maximum ball surface temperature. In addition, the contacts of three surface texture combinations, namely micro-dimpled and polished ball surface versus polished disk surface, polished ball surface versus polished disk surface and ground ball surface versus ground disk surface, are compared to demonstrate any beneficial or detrimental effect of micro-dimples in heavily loaded high speed applications. This study adopts a thermal mixed EHL point contact model, whose capability and accuracy have been well demonstrated by comparing to the experimental measurements, to quantify the deterministic tribological behavior within the contact, allowing the exploration of the underlying mechanism that governs the role of micro-dimples in the elastohydrodynamic lubrication.iv

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“…This undertaking is performed because in the models described in the literature, the efficiency of the gearbox depends on many parameters (related to a.o. the way of lubrication and the type of oil) of which the value is hard to determine without experiments [15]. The efficiency of the single-stage gearbox (η 1GB ) is calculated depending on the efficiency of the two-stage gearbox (η 2GB ) with the following equation:…”

Section: Validation Of the Two-stage Gearboxmentioning

confidence: 99%

Integrated Model of Power Electronics, Electric Motor, and Gearbox for a Light EV

Hofman¹,

Sergeant²,

Bossche³

et al. 2015

Journal of Power Electronics

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This study presents a model of a drivetrain for an integrated design of a light electric vehicle (EV). For the drivetrain of each front wheel of the single-person, battery-powered EV tricycle consists of a battery, an inverter, and an outer rotor permanent magnet synchronous motor (PMSM), which is connected to an in-wheel gearbox. The efficiency of the inverter, motor, and gearbox is analyzed over the New European Driving Cycle. To calculate the losses and efficiency of the PMSM, the power electronics in the inverter and gearbox are used. The analytical models provide a fast, but less accurate result, useful for optimization purposes. To accurately predict the efficiency of the PMSM, a finite element model is used. The models are validated by test setups. Correspondingly, a good agreement between the measurements and the calculated results is achieved. A parameter study is performed to investigate the influence of the detailed component parameters (i.e., outer rotor radius, gear ratio, and number of pole pairs and stator slots) on the average efficiency of the drivetrain.

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Experimental Investigation of Spur Gear Efficiency

Cited by 28 publications

References 0 publications

Experimental study of multiphase flow in a model gearbox

Experimental study of multiphase flow in a model gearbox

The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

Integrated Model of Power Electronics, Electric Motor, and Gearbox for a Light EV

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