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Title: Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
Authors: Elisaus, Vishak
Mohammadpour, Mahdi
Theodossiades, Stephanos
Rahnejat, Homer
Keywords: High performance transmissions
Spur Gear
Micro-geometrical form modification
Contact kinematics
Thermo-elastohydrodynamics
Non-Newtonian traction
Issue Date: 2017
Publisher: SAGE © IMechE
Citation: ELISAUS, V. ... et al, 2017. Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics, doi:10.1177/1464419317710157.
Abstract: Light weight, compactness and efficiency are key objectives in high performance vehicular transmission systems, which are subject to large variations in torque and power. Pitch line velocities of up to 52 m/s and teeth pair contact pressures of up to 3 GPa are routinely encountered under race conditions. Contact patch asymmetry due to angular misalignments between input and output shafts leads to the generation of high edge stress discontinuities on gear flanks, inducing fatigue spalling which affects system durability. Crowning is widely used as a palliative measure to mitigate these undesired effects. These problems can be further exacerbated by contact footprint truncation. The paper presents a new approach to modelling the kinematics and contact micro-geometry of meshing conjunctions of involute spur gears with profile and lead modifications. A time-efficient analytical method is presented to accurately determine the contact footprint and kinematics, leading to the solution of highly loaded non-Newtonian mixed thermo-elastohydrodynamic (TEHD) contact under the extreme prevalent conditions of high performance vehicular transmissions. The effect of tooth form modification on contact footprint truncation, contact kinematics and generated frictional power loss is investigated. This approach has not hitherto been reported in literature.
Description: This paper was accepted for publication in the journal Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics and the definitive published version is available at https://doi.org/10.1177/1464419317710157.
Version: Accepted for publication
DOI: 10.1177/1464419317710157
URI: https://dspace.lboro.ac.uk/2134/24924
Publisher Link: https://doi.org/10.1177/1464419317710157
ISSN: 1464-4193
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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