Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs

This paper evaluates a temperature variation between pulley sheaves and a metal push belt of an automotive Continuously Variable Transmission (CVT). In a study of wear mechanisms on pulley sheaves, one of the authors previously demonstrated a crystallographic phase transition from body-centered cubi...

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Autores principales:	Yuki Ono, Kenji Matsumoto, Hiroyoshi Taniguchi, Yuji Mihara
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	phase transition of steels temperature measurement continuously variable transmission thermal analysis 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/d59b4e895ad948308ea9e6bbcfbe9e5d
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spelling	oai:doaj.org-article:d59b4e895ad948308ea9e6bbcfbe9e5d2021-11-05T09:12:03ZSubsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs1881-219810.2474/trol.15.18https://doaj.org/article/d59b4e895ad948308ea9e6bbcfbe9e5d2020-01-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/1/15_18/_pdf/-char/enhttps://doaj.org/toc/1881-2198This paper evaluates a temperature variation between pulley sheaves and a metal push belt of an automotive Continuously Variable Transmission (CVT). In a study of wear mechanisms on pulley sheaves, one of the authors previously demonstrated a crystallographic phase transition from body-centered cubic (BCC) to face-centered cubic (FCC) in fine grains beneath a sliding surface of a pulley sheave which had been operated for certain period of time. Although prevailing metallurgy indicates that the transition needs a thermal history over the eutectoid point of the material, surface temperature on pulley sheaves have not been evaluated or reported. The authors therefore analyzed temperature variation on the pulley sheave under a same operating condition of the CVT as that the phase transition was discovered. The major technical problem was measurement methods used to obtain temperature distribution on the pulley surface where the clamp position of the V-belt changes continuously according to transmission ratios of the CVT. Uniquely developed infrared borescope enabled non-contact temperature measurements near the contact area during CVT operation. Measurement results were introduced to numerical calculation to predict the highest temperature on the power transmission area including subsurface area. The resultant highest temperature did not reach the eutectoid point of the material and indicated that single source of thermal energy did not occur in abovementioned phase transition. The findings generated our hypothesis that combination of energy sources, such as thermal dissipation due to power transmission, repeated impulsive forces due to contact and friction, and consequent generation of finer grain structure, enhances the phase transformation from BCC to FCC even under milder conditions than the thresholds of every single energy source.Yuki OnoKenji MatsumotoHiroyoshi TaniguchiYuji MiharaJapanese Society of Tribologistsarticlephase transition of steelstemperature measurementcontinuously variable transmissionthermal analysisPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 1, Pp 18-24 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	phase transition of steels temperature measurement continuously variable transmission thermal analysis Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	phase transition of steels temperature measurement continuously variable transmission thermal analysis Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yuki Ono Kenji Matsumoto Hiroyoshi Taniguchi Yuji Mihara Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs
description	This paper evaluates a temperature variation between pulley sheaves and a metal push belt of an automotive Continuously Variable Transmission (CVT). In a study of wear mechanisms on pulley sheaves, one of the authors previously demonstrated a crystallographic phase transition from body-centered cubic (BCC) to face-centered cubic (FCC) in fine grains beneath a sliding surface of a pulley sheave which had been operated for certain period of time. Although prevailing metallurgy indicates that the transition needs a thermal history over the eutectoid point of the material, surface temperature on pulley sheaves have not been evaluated or reported. The authors therefore analyzed temperature variation on the pulley sheave under a same operating condition of the CVT as that the phase transition was discovered. The major technical problem was measurement methods used to obtain temperature distribution on the pulley surface where the clamp position of the V-belt changes continuously according to transmission ratios of the CVT. Uniquely developed infrared borescope enabled non-contact temperature measurements near the contact area during CVT operation. Measurement results were introduced to numerical calculation to predict the highest temperature on the power transmission area including subsurface area. The resultant highest temperature did not reach the eutectoid point of the material and indicated that single source of thermal energy did not occur in abovementioned phase transition. The findings generated our hypothesis that combination of energy sources, such as thermal dissipation due to power transmission, repeated impulsive forces due to contact and friction, and consequent generation of finer grain structure, enhances the phase transformation from BCC to FCC even under milder conditions than the thresholds of every single energy source.
format	article
author	Yuki Ono Kenji Matsumoto Hiroyoshi Taniguchi Yuji Mihara
author_facet	Yuki Ono Kenji Matsumoto Hiroyoshi Taniguchi Yuji Mihara
author_sort	Yuki Ono
title	Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs
title_short	Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs
title_full	Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs
title_fullStr	Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs
title_full_unstemmed	Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs
title_sort	subsurface temperature estimation during traction transmission in the variator of metal v-belt cvts
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/d59b4e895ad948308ea9e6bbcfbe9e5d
work_keys_str_mv	AT yukiono subsurfacetemperatureestimationduringtractiontransmissioninthevariatorofmetalvbeltcvts AT kenjimatsumoto subsurfacetemperatureestimationduringtractiontransmissioninthevariatorofmetalvbeltcvts AT hiroyoshitaniguchi subsurfacetemperatureestimationduringtractiontransmissioninthevariatorofmetalvbeltcvts AT yujimihara subsurfacetemperatureestimationduringtractiontransmissioninthevariatorofmetalvbeltcvts
_version_	1718444438635675648

Subsurface Temperature Estimation during Traction Transmission in the Variator of Metal V-Belt CVTs

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