Results 201 to 210 of about 467 (235)

Churning power losses of a gearbox with spiral bevel geared transmission

Tribology International, 2019
Abstract To predict the churning power losses in a gearbox with spiral bevel geared transmission, based on the Computational Fluid Dynamics (CFD) method, a numerical simulation model for the splash lubrication of the intermediate gearbox of a helicopter including gear box housing, a spiral bevel gear pair and an oil guide device is established and ...
Xiaozhou Hu, Yu Dai
exaly   +2 more sources

A study of churning losses in dip-lubricated spur gears

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 1999
Churning losses contribute significantly, both to overall inefficiency and to oil heating, in many dip-lubricated transmission systems, notably in automotive applications. For this reason, a reasonably accurate estimate of churning loss is often desirable at the design stage.
P Luke, A V Olver
exaly   +2 more sources

A Note on Flow Regimes and Churning Loss Modelling

Volume 8: 11th International Power Transmission and Gearing Conference; 13th International Conference on Advanced Vehicle and Tire Technologies, 2011
The purpose of this study is to investigate the various fluid flow regimes generated by a pinion running partly immersed in an oil bath and the corresponding churning power losses. In a series of papers, the authors have established several loss formulae whose validity depends on two different flow regimes characterized via a critical Reynolds number ...
Changenet, Christophe, Leprince, Gauthier, Ville, Fabrice, Velex, Philippe   +3 more
openaire   +4 more sources

Housing Influence on Churning Losses in Geared Transmissions

Volume 7: 10th International Power Transmission and Gearing Conference, 2007
In a previous paper, a series of analytical formulas were presented enabling accurate predictions of churning losses for one gear which is typical of automotive transmission geometry. However, this formulation does not take into account the influence of flanges and deflectors.
Changenet, Christophe, Velex, Philippe
openaire   +2 more sources

Simulation of Churning Losses in Geared Box

Applied Mechanics and Materials, 2014
Relative experiments show that churning causes dominant power losses in geared box, which has an important influence on dynamic efficiency assessment of the driving system. This paper put forward a simulation model of churning losses and compared the simulation results with theoretical value.
Bin Wang, Lin Jing Liu, Ping Wang
openaire   +1 more source

390. The estimation of losses of butterfat in churning

Journal of Dairy Research, 1949
The Bird & Derby method of calculating percentage butterfat loss in buttermilk is in error because it assumes that all the buttermilk in the granules at draining is retained in the buttermilk, whereas much of it is washed out in the wash water. Lactose estimations in butter and buttermilk confirm Udy's finding that butter contains about 10% of ...
F. H. McDowall, A. K. R. McDowell
openaire   +1 more source

A Model for the Prediction of Churning Losses in Geared Transmissions—Preliminary Results

Journal of Mechanical Design, 2006
A series of formulas are presented which enable accurate predictions of churning losses for one pinion characteristic of automotive transmission geometry. The results are based on dimensional analysis and have been experimentally validated over a wide range of speeds, gear geometries, lubricants, and immersion depths.
Changenet, Christophe, Velex, Philippe
openaire   +2 more sources

Modeling of ball bearing churning losses

Physics of Fluids
Ball bearings are widely used in automotive driveline systems, and their performance plays a crucial role in driveline safety and transmission efficiency. However, the studies on revealing the internal flow mechanism of ball bearings and predicting the churning power loss under jet lubrication system are still insufficient.
Shuai Hu, Wuqi Gong, Xiangyu Xu, Xiaomin Liu   +3 more
openaire   +1 more source

Experimental and Computational Studies of the No-Load Churning Loss of a Truck Axle

SAE Technical Paper Series, 2020
<div class="section abstract"><div class="htmlview paragraph">This paper describes the work performed in predicting and measuring the contribution of oil churning to the no-load losses of a commercial truck axle at typical running speeds. A computational fluid dynamics (CFD) analysis of the churning losses was conducted.
Luis Silva, William Liou, Yang Yang, John Bair, Claudia M. Fajardo, Steven Wesolowski, Farrukh Qureshi   +6 more
openaire   +1 more source

Churning and Drag Losses

1984
Based on the classical theories of fluid flow around a moving sphere and a cylinder, simple formulas for obtaining a first approximation to the lubricant drag forces and churning moments in a rolling bearing are presented.
openaire   +1 more source