A test procedure to investigate lubricant-surface combination for high performance racing transmissions

Compact light weight and dry sump (significantly reduced volume of lubricant) are the desired attributes for high performance racing transmissions, whilst improving upon efficiency and reliability remain paramount objectives. The complex multi-objective nature of this task points to an integrated ap...

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Main Authors:	Ed Humphrey, Nick Morris, Ramin Rahmani, Homer Rahnejat, Greg Rapson
Format:	Default Conference proceeding
Published:	2017
Subjects:	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/26550
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id	rr-article-9552737
record_format	Figshare
spelling	rr-article-95527372017-01-01T00:00:00Z A test procedure to investigate lubricant-surface combination for high performance racing transmissions Ed Humphrey (3235584) Nick Morris (1256529) Ramin Rahmani (1250418) Homer Rahnejat (1247550) Greg Rapson (7208747) Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified Compact light weight and dry sump (significantly reduced volume of lubricant) are the desired attributes for high performance racing transmissions, whilst improving upon efficiency and reliability remain paramount objectives. The complex multi-objective nature of this task points to an integrated approach to lubricant-mechanical system optimisation. The extreme operating conditions in racing transmissions, such as contact kinematics and thermal loading present significant tribological challenges. Thin lubricant films in non-Newtonian shear are subjected to mixed thermo-elastohydrodynamic regime of lubrication. Under these conditions boundary active lubricant species often determine the contact tribological performance rather than the bulk rheological properties of the lubricant itself. Therefore, the interaction of lubricant additive package with the contacting solid surfaces is the key to an optimised solution. The paper investigates the lubricant-surface interfacial effect upon frictional characteristics in contact conditions which are representative of gear teeth meshing conditions in high performance transmissions. The study uses pin-on-disc tribometry. As the contact conditions are mainly governed by the formation of surface-adhered tribo-films, their effect upon frictional characteristics is further investigated through use of atomic force microscopy (AFM) in lateral force mode (LFM). A test procedure is presented to benchmark lubricant additive package-surface combinations for improved tribological performance. The investigation takes into account surface material, surface topography and lubricant additive package, all of which affect the tribo-chemical absorption or bonding of a thin film to the contacting surfaces. The test protocol also includes surface chemical spectrometry and Scanning Electron Microscopy (SEM). The presented methodology has not hitherto been reported in literature. 2017-01-01T00:00:00Z Text Conference contribution 2134/26550 https://figshare.com/articles/conference_contribution/A_test_procedure_to_investigate_lubricant-surface_combination_for_high_performance_racing_transmissions/9552737 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified Ed Humphrey Nick Morris Ramin Rahmani Homer Rahnejat Greg Rapson A test procedure to investigate lubricant-surface combination for high performance racing transmissions
description	Compact light weight and dry sump (significantly reduced volume of lubricant) are the desired attributes for high performance racing transmissions, whilst improving upon efficiency and reliability remain paramount objectives. The complex multi-objective nature of this task points to an integrated approach to lubricant-mechanical system optimisation. The extreme operating conditions in racing transmissions, such as contact kinematics and thermal loading present significant tribological challenges. Thin lubricant films in non-Newtonian shear are subjected to mixed thermo-elastohydrodynamic regime of lubrication. Under these conditions boundary active lubricant species often determine the contact tribological performance rather than the bulk rheological properties of the lubricant itself. Therefore, the interaction of lubricant additive package with the contacting solid surfaces is the key to an optimised solution. The paper investigates the lubricant-surface interfacial effect upon frictional characteristics in contact conditions which are representative of gear teeth meshing conditions in high performance transmissions. The study uses pin-on-disc tribometry. As the contact conditions are mainly governed by the formation of surface-adhered tribo-films, their effect upon frictional characteristics is further investigated through use of atomic force microscopy (AFM) in lateral force mode (LFM). A test procedure is presented to benchmark lubricant additive package-surface combinations for improved tribological performance. The investigation takes into account surface material, surface topography and lubricant additive package, all of which affect the tribo-chemical absorption or bonding of a thin film to the contacting surfaces. The test protocol also includes surface chemical spectrometry and Scanning Electron Microscopy (SEM). The presented methodology has not hitherto been reported in literature.
format	Default Conference proceeding
author	Ed Humphrey Nick Morris Ramin Rahmani Homer Rahnejat Greg Rapson
author_facet	Ed Humphrey Nick Morris Ramin Rahmani Homer Rahnejat Greg Rapson
author_sort	Ed Humphrey (3235584)
title	A test procedure to investigate lubricant-surface combination for high performance racing transmissions
title_short	A test procedure to investigate lubricant-surface combination for high performance racing transmissions
title_full	A test procedure to investigate lubricant-surface combination for high performance racing transmissions
title_fullStr	A test procedure to investigate lubricant-surface combination for high performance racing transmissions
title_full_unstemmed	A test procedure to investigate lubricant-surface combination for high performance racing transmissions
title_sort	test procedure to investigate lubricant-surface combination for high performance racing transmissions
publishDate	2017
url	https://hdl.handle.net/2134/26550
_version_	1799638139800649728

A test procedure to investigate lubricant-surface combination for high performance racing transmissions

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