On the dynamics of lubricated hypoid gears

Karagiannis, Ioannis; Theodossiades, Stephanos; Rahnejat, Homer

doi:10.1016/j.mechmachtheory.2011.08.012

Cited by 61 publications

(94 citation statements)

References 47 publications

(98 reference statements)

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“…Then, the thickness of a film of lubricant can be predicted, prior to ascertaining the regime of lubrication and thus the contributions due to viscous shear and any boundary interactions in the same manner as that proposed by De la Cruz et al [7] for helical gears. This analytical treatment is highlighted by Karagiannis et al [14] using the Grubin's extrapolated oil film thickness equation as a function of contact load and sliding velocity [15]. Karagiannis et al [14] predicted thin thermo-elastohydrodynamic films, which are subjected to non-Newtonian shear and of insufficient thickness to guard against asperity interactions on the meshing teeth pairs.…”

Section: -Introductionmentioning

confidence: 99%

“…This analytical treatment is highlighted by Karagiannis et al [14] using the Grubin's extrapolated oil film thickness equation as a function of contact load and sliding velocity [15]. Karagiannis et al [14] predicted thin thermo-elastohydrodynamic films, which are subjected to non-Newtonian shear and of insufficient thickness to guard against asperity interactions on the meshing teeth pairs. Whilst the use of an extrapolated equation reduces the computation times for transmissions with several teeth pairs in simultaneous mesh, such equations do not often accurately represent the prevailing contact conditions in gear meshing problems.…”

Section: -Introductionmentioning

confidence: 99%

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Non-Newtonian mixed elastohydrodynamics of differential hypoid gears at high loads

et al. 2013

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Section: -Introductionmentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

Non-Newtonian mixed elastohydrodynamics of differential hypoid gears at high loads

et al. 2013

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“…The instantaneous contact geometry, lubricant entrainment speed (average speed of the meshing surfaces) and the relative sliding surface speed of the meshing teeth, as well as the load share per teeth pair contact are obtained through the developed TCA model [24]. The developed TCA model neglects the effect of tooth bending for determination of contact kinematics (rolling and sliding velocities) and radii of curvature.…”

Section: Tooth Contact Analysismentioning

confidence: 99%

Transient thermal analysis of mixed-elastohydrodynamic contact of high performance transmission in a dry sump environment

Fatourehchi

Mohammadpour

Theodossiades

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Fuel efficiency is one of the main concerns in the optimization of modern racing transmissions. The dry sump transmissions are the preferred choice for high performance racing applications. While it provides adequate lubricant for gear contacts, it minimises the system churning losses, and therefore enhances the system efficiency. An important aspect is assessing its thermal performance in removing the generated frictional heat. The generated heat in the highly loaded high shear contacts of racing transmissions should be dissipated through use of directed impinging oil jets and in an air-oil mist environment. The paper presents an integrated tribological and 3D computational fluid dynamics analysis for a spur gear pair, incorporated into an overall finite element model to evaluate the quantity of generated heat and its removal rate from the rotating gear surfaces. Furthermore, the temperature distribution in the circumferential direction is predicted and used to evaluate transient temperature distribution over representative race laps. Such an approach has not hitherto been reported in literature.

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“…It is more accurate to represent the meshing of gear problem as lubricated conjunctions as highlighted by De la Cruz et al 11 for the case of helical gears. An analytical approach is highlighted by Karagiannis et al, 22 using the Grubin's extrapolated oil film thickness equation as a function of contact load and sliding velocity. 23 In Karagiannis et al, 22 thin thermo-elastohydrodynamic films under non-Newtonian shear promoted asperity friction.…”

Section: Introductionmentioning

confidence: 99%

Non-Newtonian mixed thermo-elastohydrodynamics of hypoid gear pairs

Mohammadpour

Theodossiades

Rahnejat

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Transmission efficiency is the main objective in the development of vehicular differential systems, comprising hypoid gear pairs. The overall aim is to contribute to improved vehicle fuel efficiency and thus levels of harmful emissions for modern desired eco-drive axles. Detailed predictive analysis plays an important role in this quest, particularly under realistic operating conditions, comprising high contact loads and shear rates. Under these conditions, the hypoid gear pairs are subject to mixed non-Newtonian thermo-elastohydrodynamic conditions, which is the approach undertaken in this paper. Such an approach for hypoid gear pair has not hitherto been reported in the literature.

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On the dynamics of lubricated hypoid gears

Cited by 61 publications

References 47 publications

Non-Newtonian mixed elastohydrodynamics of differential hypoid gears at high loads

Non-Newtonian mixed elastohydrodynamics of differential hypoid gears at high loads

Transient thermal analysis of mixed-elastohydrodynamic contact of high performance transmission in a dry sump environment

Non-Newtonian mixed thermo-elastohydrodynamics of hypoid gear pairs

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