A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs

This study investigated oil film in contact portions formed by the dynamic loading of a push belt and pulley sheaves for automobile CVTs. Technical difficulties of direct oil film measurement came from the structure and movement of components in variator. We therefore employed an estimation method,...

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Autores principales:	Yuki Ono, Kenji Matsumoto, Yuji Mihara
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	impact loading elastohydrodynamic lubrication cvt optical interferometry thin film sensor pressure measurement Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/6b73a3e885d84ad1b4180d5f0b73248c
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spelling	oai:doaj.org-article:6b73a3e885d84ad1b4180d5f0b73248c2021-11-05T09:18:04ZA Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs1881-219810.2474/trol.14.18https://doaj.org/article/6b73a3e885d84ad1b4180d5f0b73248c2019-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/2/14_18/_pdf/-char/enhttps://doaj.org/toc/1881-2198This study investigated oil film in contact portions formed by the dynamic loading of a push belt and pulley sheaves for automobile CVTs. Technical difficulties of direct oil film measurement came from the structure and movement of components in variator. We therefore employed an estimation method, which included the measurements of duochromatic interference of actual CVT belt elements, and thin film pressure sensors formed on a pulley sheave. Interferometry measurements showed that the film thickness, calculated by the formulae derived from the similarities between stable and transient Reynolds equations, indicated an accuracy of about 88%. This estimation approach was applied to an actual CVT variator under a typical operation mode. Crucial parameters regarding impulse contact were measured by the thin film sensor and sensor pressure showed peaks just after and immediately before contacts. Film thickness, which was estimated by the loading time and maximum pressure, indicated that the lubrication film had a thickness lower than the surface roughness of the components. That means the lubrication regime was in mixed or boundary, and the fact supports previous estimations by unit testing and chemical analysis of tribofilms.Yuki OnoKenji MatsumotoYuji MiharaJapanese Society of Tribologistsarticleimpact loadingelastohydrodynamic lubricationcvtoptical interferometrythin film sensorpressure measurementPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 2, Pp 18-23 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	impact loading elastohydrodynamic lubrication cvt optical interferometry thin film sensor pressure measurement Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	impact loading elastohydrodynamic lubrication cvt optical interferometry thin film sensor pressure measurement Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yuki Ono Kenji Matsumoto Yuji Mihara A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs
description	This study investigated oil film in contact portions formed by the dynamic loading of a push belt and pulley sheaves for automobile CVTs. Technical difficulties of direct oil film measurement came from the structure and movement of components in variator. We therefore employed an estimation method, which included the measurements of duochromatic interference of actual CVT belt elements, and thin film pressure sensors formed on a pulley sheave. Interferometry measurements showed that the film thickness, calculated by the formulae derived from the similarities between stable and transient Reynolds equations, indicated an accuracy of about 88%. This estimation approach was applied to an actual CVT variator under a typical operation mode. Crucial parameters regarding impulse contact were measured by the thin film sensor and sensor pressure showed peaks just after and immediately before contacts. Film thickness, which was estimated by the loading time and maximum pressure, indicated that the lubrication film had a thickness lower than the surface roughness of the components. That means the lubrication regime was in mixed or boundary, and the fact supports previous estimations by unit testing and chemical analysis of tribofilms.
format	article
author	Yuki Ono Kenji Matsumoto Yuji Mihara
author_facet	Yuki Ono Kenji Matsumoto Yuji Mihara
author_sort	Yuki Ono
title	A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs
title_short	A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs
title_full	A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs
title_fullStr	A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs
title_full_unstemmed	A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs
title_sort	study of the lubrication under impact loading - experimental and analytical application to push belt cvts
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/6b73a3e885d84ad1b4180d5f0b73248c
work_keys_str_mv	AT yukiono astudyofthelubricationunderimpactloadingexperimentalandanalyticalapplicationtopushbeltcvts AT kenjimatsumoto astudyofthelubricationunderimpactloadingexperimentalandanalyticalapplicationtopushbeltcvts AT yujimihara astudyofthelubricationunderimpactloadingexperimentalandanalyticalapplicationtopushbeltcvts AT yukiono studyofthelubricationunderimpactloadingexperimentalandanalyticalapplicationtopushbeltcvts AT kenjimatsumoto studyofthelubricationunderimpactloadingexperimentalandanalyticalapplicationtopushbeltcvts AT yujimihara studyofthelubricationunderimpactloadingexperimentalandanalyticalapplicationtopushbeltcvts
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A Study of the Lubrication under Impact Loading - Experimental and Analytical Application to Push Belt CVTs

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