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Article

Lubricated Loaded Tooth Contact Analysis and Non-Newtonian Thermoelastohydrodynamics of High-Performance Spur Gear Transmission Systems

Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire LE11 3TU, UK
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Lubricants 2020, 8(2), 20; https://doi.org/10.3390/lubricants8020020
Received: 19 December 2019 / Revised: 10 February 2020 / Accepted: 11 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Tribology of Powertrain Systems)
Energy efficiency and functional reliability are the two key requirements in the design of high-performance transmissions. Therefore, a representative analysis replicating real operating conditions is essential. This paper presents the thermoelastohydrodynamic lubrication (TEHL) of meshing spur gear teeth of high-performance racing transmission systems, where high generated contact pressures and lubricant shear lead to non-Newtonian traction. The determination of the input contact geometry of meshing pairs as well as contact kinematics are essential steps for representative TEHL. These are incorporated in the current analysis through the use of Lubricated Loaded Tooth Contact Analysis (LLTCA), which is far more realistic than the traditional Tooth Contact Analysis (TCA). In addition, the effects of lubricant and flash surface temperature rise of contacting pairs, leading to the thermal thinning of lubricant, are taken into account using a thermal network model. Furthermore, high-speed contact kinematics lead to shear thinning of the lubricant and reduce the film thickness under non-Newtonian traction. This comprehensive approach based on established TEHL analysis, particularly including the effect of LLTCA on the TEHL of spur gears, has not hitherto been reported in literature. View Full-Text
Keywords: high performance transmissions; spur gears; tooth contact analysis; thermoelastohydrodynamics; friction; transmission efficiency high performance transmissions; spur gears; tooth contact analysis; thermoelastohydrodynamics; friction; transmission efficiency
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MDPI and ACS Style

Sivayogan, G.; Rahmani, R.; Rahnejat, H. Lubricated Loaded Tooth Contact Analysis and Non-Newtonian Thermoelastohydrodynamics of High-Performance Spur Gear Transmission Systems. Lubricants 2020, 8, 20. https://doi.org/10.3390/lubricants8020020

AMA Style

Sivayogan G, Rahmani R, Rahnejat H. Lubricated Loaded Tooth Contact Analysis and Non-Newtonian Thermoelastohydrodynamics of High-Performance Spur Gear Transmission Systems. Lubricants. 2020; 8(2):20. https://doi.org/10.3390/lubricants8020020

Chicago/Turabian Style

Sivayogan, Gajarajan, Ramin Rahmani, and Homer Rahnejat. 2020. "Lubricated Loaded Tooth Contact Analysis and Non-Newtonian Thermoelastohydrodynamics of High-Performance Spur Gear Transmission Systems" Lubricants 8, no. 2: 20. https://doi.org/10.3390/lubricants8020020

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