Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves

Measuring and estimating the traction coefficient is necessary to improve transmitting efficiency and design compact, lightweight toroidal continuously variable transmissions (T-CVTs). However, few attempts have been made to measure and estimate the traction coefficient of T-CVTs under practical usa...

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Autores principales:	Hirofumi Itagaki, Hiroki Hashiguchi, Masahiro Kita, Hiroki Nishii
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2016
Materias:	traction drive toroidal cvt traction fluid traction coefficient traction tester 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/40b27318af044f0caf793fd2df55dc84
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spelling	oai:doaj.org-article:40b27318af044f0caf793fd2df55dc842021-11-05T09:21:03ZDevelopment of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves1881-219810.2474/trol.11.661https://doaj.org/article/40b27318af044f0caf793fd2df55dc842016-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/11/6/11_661/_pdf/-char/enhttps://doaj.org/toc/1881-2198Measuring and estimating the traction coefficient is necessary to improve transmitting efficiency and design compact, lightweight toroidal continuously variable transmissions (T-CVTs). However, few attempts have been made to measure and estimate the traction coefficient of T-CVTs under practical usage conditions, and the design of T-CVTs has used extrapolated values from traction coefficients measured under low-power conditions. Therefore, we developed a high-power two-roller traction tester to clarify variation trends in traction curves under operating conditions similar to a T-CVT. The results showed a nearly linear relation between the maximum traction coefficient and the roller surface temperature. Furthermore, the change rate of the maximum traction coefficient with respect to roller surface temperature was dependent on the maximum contact pressure. This paper also compares several traction models under practical operating conditions. A viscoelastoplastic model was constructed and compared with a conventional elastoplastic model. In a wide range of operating conditions, the viscoelastoplastic model showed small differences in the maximum traction coefficient between measured and calculated curves compared with the elastoplastic model. The traction tester and the traction model contribute to building a traction curve database to make T-CVTs more compact, lightweight, and efficient.Hirofumi ItagakiHiroki HashiguchiMasahiro KitaHiroki NishiiJapanese Society of Tribologistsarticletraction drivetoroidal cvttraction fluidtraction coefficienttraction testerPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 11, Iss 6, Pp 661-674 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	traction drive toroidal cvt traction fluid traction coefficient traction tester Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	traction drive toroidal cvt traction fluid traction coefficient traction tester Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Hirofumi Itagaki Hiroki Hashiguchi Masahiro Kita Hiroki Nishii Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves
description	Measuring and estimating the traction coefficient is necessary to improve transmitting efficiency and design compact, lightweight toroidal continuously variable transmissions (T-CVTs). However, few attempts have been made to measure and estimate the traction coefficient of T-CVTs under practical usage conditions, and the design of T-CVTs has used extrapolated values from traction coefficients measured under low-power conditions. Therefore, we developed a high-power two-roller traction tester to clarify variation trends in traction curves under operating conditions similar to a T-CVT. The results showed a nearly linear relation between the maximum traction coefficient and the roller surface temperature. Furthermore, the change rate of the maximum traction coefficient with respect to roller surface temperature was dependent on the maximum contact pressure. This paper also compares several traction models under practical operating conditions. A viscoelastoplastic model was constructed and compared with a conventional elastoplastic model. In a wide range of operating conditions, the viscoelastoplastic model showed small differences in the maximum traction coefficient between measured and calculated curves compared with the elastoplastic model. The traction tester and the traction model contribute to building a traction curve database to make T-CVTs more compact, lightweight, and efficient.
format	article
author	Hirofumi Itagaki Hiroki Hashiguchi Masahiro Kita Hiroki Nishii
author_facet	Hirofumi Itagaki Hiroki Hashiguchi Masahiro Kita Hiroki Nishii
author_sort	Hirofumi Itagaki
title	Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves
title_short	Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves
title_full	Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves
title_fullStr	Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves
title_full_unstemmed	Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves
title_sort	development of a high-power two-roller traction tester and measurement of traction curves
publisher	Japanese Society of Tribologists
publishDate	2016
url	https://doaj.org/article/40b27318af044f0caf793fd2df55dc84
work_keys_str_mv	AT hirofumiitagaki developmentofahighpowertworollertractiontesterandmeasurementoftractioncurves AT hirokihashiguchi developmentofahighpowertworollertractiontesterandmeasurementoftractioncurves AT masahirokita developmentofahighpowertworollertractiontesterandmeasurementoftractioncurves AT hirokinishii developmentofahighpowertworollertractiontesterandmeasurementoftractioncurves
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Development of a High-Power Two-Roller Traction Tester and Measurement of Traction Curves

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