Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions

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 condit...

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Main Authors:	Vishak Elisaus, Mahdi Mohammadpour, Stephanos Theodossiades, Homer Rahnejat
Format:	Default Article
Published:	2017
Subjects:	Mechanical engineering not elsewhere classified High performance transmissions Spur Gear Micro-geometrical form modification Contact kinematics Thermo-elastohydrodynamics Non-Newtonian traction Mechanical Engineering not elsewhere classified Mechanical Engineering
Online Access:	https://hdl.handle.net/2134/24924
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id	rr-article-9567239
record_format	Figshare
spelling	rr-article-95672392017-05-10T00:00:00Z Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions Vishak Elisaus (7208780) Mahdi Mohammadpour (7204604) Stephanos Theodossiades (1247457) Homer Rahnejat (1247550) Mechanical engineering not elsewhere classified High performance transmissions Spur Gear Micro-geometrical form modification Contact kinematics Thermo-elastohydrodynamics Non-Newtonian traction Mechanical Engineering not elsewhere classified Mechanical Engineering 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. 2017-05-10T00:00:00Z Text Journal contribution 2134/24924 https://figshare.com/articles/journal_contribution/Effect_of_teeth_micro-geometrical_form_modification_on_contact_kinematics_and_efficiency_of_high_performance_transmissions/9567239 CC BY-NC 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified High performance transmissions Spur Gear Micro-geometrical form modification Contact kinematics Thermo-elastohydrodynamics Non-Newtonian traction Mechanical Engineering not elsewhere classified Mechanical Engineering
spellingShingle	Mechanical engineering not elsewhere classified High performance transmissions Spur Gear Micro-geometrical form modification Contact kinematics Thermo-elastohydrodynamics Non-Newtonian traction Mechanical Engineering not elsewhere classified Mechanical Engineering Vishak Elisaus Mahdi Mohammadpour Stephanos Theodossiades Homer Rahnejat Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
description	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.
format	Default Article
author	Vishak Elisaus Mahdi Mohammadpour Stephanos Theodossiades Homer Rahnejat
author_facet	Vishak Elisaus Mahdi Mohammadpour Stephanos Theodossiades Homer Rahnejat
author_sort	Vishak Elisaus (7208780)
title	Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
title_short	Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
title_full	Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
title_fullStr	Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
title_full_unstemmed	Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
title_sort	effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
publishDate	2017
url	https://hdl.handle.net/2134/24924
_version_	1796738785611874304

Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions

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