The efficiency of a hypoid axle—a thermally coupled lubrication model

Kolekar, Anant S.; Olver, A.D.; Sworski, Adam E.; Lockwood, Frances E.

doi:10.1016/j.triboint.2012.03.013

Cited by 20 publications

(10 citation statements)

References 12 publications

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“…The predicted values are in range of 99.05%-99.15%. This range is in line with the observed values in the literature for the overall axle efficiency of 96%-98.5% for similar range of working conditions [46][47][48].…”

Section: 1dynamic Transmission Error (Dte)supporting

confidence: 92%

Effect of tapered roller bearing supports on the dynamic behaviour of hypoid gear pair differentials

Mohammadpour

Johns-Rahnejat

Theodossiades

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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Noise and vibration refinement, and energy efficiency are the key drivers in power train development. The final drive (differential) is a source of vibration concern and also contributes to power train inefficiency. To optimise differential characteristics for the key issues of refinement and efficiency detailed models of gear interactions as well as support bearing dynamics is required. This study reports on an integrated lubricated bearing and gear contacts with 8 degrees-of-freedom dynamic analysis (tribo-dynamic model). NonNewtonian shear behaviour of thin lubricant film conjunctions is taken into account the integrated tribo-dynamic analysis has not hitherto been reported in literature. The resultsshow that the transmitted vibration spectra from the system onto the differential casing are dominated by bearing frequencies rather than the meshing of gears. This effect becomes more significant with higher bearing preload which extends the bearing loaded region and thus reduces the bearing compliance effect. It is also revealed that sufficient bearing preload improves vibration refinement, but can lead to marginally reduced transmission efficiency.

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Section: 1dynamic Transmission Error (Dte)supporting

confidence: 92%

Effect of tapered roller bearing supports on the dynamic behaviour of hypoid gear pair differentials

Mohammadpour

Johns-Rahnejat

Theodossiades

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Industrial gear units are often dipped lubricated in the case of low to medium speed geared transmission. In these cases, churning losses are an important part of no load losses, as shown in studies on both cylindrical [1] or hypoid gears [2]. An accurate evaluation of these dissipation sources is needed.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of gears, different experimental studies have been conducted with the aim of developing empirical relationships to quantify churning losses. As an example, some tests have been conducted with high viscosity oils and low rotational speeds by Terekhov [6] for spur cylindrical gears or Kolekar et al [2] for hypoid gears. Further extension of Terekhov work was done by Lauster and Boos [7], who applied this approach on a real truck transmission.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations and analysis on churning losses of splash lubricated spiral bevel gears

Laruelle

Fossier

Changenet

et al. 2017

Mechanics & Industry

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Churning losses are a complex phenomenon which generates significant power losses when considering splash lubrication of gear units. However, only few works deal with bevel gears dipped lubrication losses. The objective of this study is to provide a wide variety of experimental tests on churning losses, especially getting interested in geometry of spiral bevel gears influence. A specific test rig was used in order to study a single spiral bevel gear partially immersed in an oil bath. Experiments have been conducted for several operating conditions in terms of speeds, lubricants, temperatures and gear geometries to study their impact on splash lubrication power losses. These experimental results are compared with the predictions from various literature sources. As the results did not agree well with the predictions for all operating conditions, an extended equation derived from previous works is introduced to estimate churning losses of bevel gears.

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“…Based on the definition of average entrainment speed distributed along the tooth contact profile in other relevant work on hypoid gears [20], u e 6 can be written as a function of ω and an effective radius (R e ) that depends on geometry (Eq. 8).…”

Section: Gear Loss 331 Load-dependentmentioning

confidence: 99%

Hypoid gear vehicle axle efficiency

Kakavas

Olver

Dini

2016

Tribology International

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In this paper, a study of a hypoid gear vehicle axle is presented. Using a custom rig, loadindependent losses have been accurately measured and the effect of viscosity on spin loss has been quantified. Solution methods for the calculation of component losses are presented and combined into a complete thermally-coupled transient model for the estimation of axle efficiency. An analysis of hypoid gear kinematics reveals a simplification, commonly adopted by other researchers, regarding the velocity of the point of contact in hypoid gears, to be in error. As a result, the calculation of lubrication parameters has been improved. Finally, experimental measurements are compared to the generated simulation results for a number of operating scenarios and satisfactory correlation is observed.

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The efficiency of a hypoid axle—a thermally coupled lubrication model

Cited by 20 publications

References 12 publications

Effect of tapered roller bearing supports on the dynamic behaviour of hypoid gear pair differentials

Effect of tapered roller bearing supports on the dynamic behaviour of hypoid gear pair differentials

Experimental investigations and analysis on churning losses of splash lubricated spiral bevel gears

Hypoid gear vehicle axle efficiency

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