Development of Fluids for Chain Type CVTs

In the area of transmissions, continuously variable transmissions (CVTs) have been adopted for cars with various engine displacements mainly in Japan and North America because of their better fuel economy and smooth shift feeling. Continuously variable transmission fluids (CVTFs) with lower viscosit...

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Main Authors: Toshiaki Iwai, Keiichi Narita, Mitsugu Kudo, Masato Ogawa
Format: Article
Language:English
Published: Japanese Society of Tribologists 2017-07-01
Series:Tribology Online
Subjects:
Online Access:https://www.jstage.jst.go.jp/article/trol/12/3/12_147/_pdf/-char/en
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author Toshiaki Iwai
Keiichi Narita
Mitsugu Kudo
Masato Ogawa
author_facet Toshiaki Iwai
Keiichi Narita
Mitsugu Kudo
Masato Ogawa
author_sort Toshiaki Iwai
collection DOAJ
description In the area of transmissions, continuously variable transmissions (CVTs) have been adopted for cars with various engine displacements mainly in Japan and North America because of their better fuel economy and smooth shift feeling. Continuously variable transmission fluids (CVTFs) with lower viscosity and optimal friction property for chain and pulley will be effective for improving fuel saving performance in CVT. In this study, compared with a market chain CVTF, the developed oil had a lower viscosity, a higher metal friction coefficient, and higher clutch transmission capacity, while its anti-seizure property was better than a market chain CVTF. As to higher metal friction coefficient, small islands were observed on friction surface by atomic force microscopy (AFM) .It is supposed that those islands promote a shift to the boundary lubrication regime, contributing to a higher friction coefficient. The developed oil containing some additives demonstrated 10% higher variator torque capacity compared with a commercial CVTF.
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spelling doaj.art-e5a090a545d44cf590eee0fc298552f42022-12-21T22:55:06ZengJapanese Society of TribologistsTribology Online1881-21982017-07-0112314715010.2474/trol.12.147trolDevelopment of Fluids for Chain Type CVTsToshiaki Iwai0Keiichi Narita1Mitsugu Kudo2Masato Ogawa3Idemitsu Kosan Co., Ltd., Lubricants Research LaboratoryIdemitsu Kosan Co., Ltd., Lubricants Research LaboratoryIdemitsu Kosan Co., Ltd., Lubricants DepartmentSubaru CorporationIn the area of transmissions, continuously variable transmissions (CVTs) have been adopted for cars with various engine displacements mainly in Japan and North America because of their better fuel economy and smooth shift feeling. Continuously variable transmission fluids (CVTFs) with lower viscosity and optimal friction property for chain and pulley will be effective for improving fuel saving performance in CVT. In this study, compared with a market chain CVTF, the developed oil had a lower viscosity, a higher metal friction coefficient, and higher clutch transmission capacity, while its anti-seizure property was better than a market chain CVTF. As to higher metal friction coefficient, small islands were observed on friction surface by atomic force microscopy (AFM) .It is supposed that those islands promote a shift to the boundary lubrication regime, contributing to a higher friction coefficient. The developed oil containing some additives demonstrated 10% higher variator torque capacity compared with a commercial CVTF.https://www.jstage.jst.go.jp/article/trol/12/3/12_147/_pdf/-char/enchain cvtfafmmetal frictionclutch frictionanti-seizure property
spellingShingle Toshiaki Iwai
Keiichi Narita
Mitsugu Kudo
Masato Ogawa
Development of Fluids for Chain Type CVTs
Tribology Online
chain cvtf
afm
metal friction
clutch friction
anti-seizure property
title Development of Fluids for Chain Type CVTs
title_full Development of Fluids for Chain Type CVTs
title_fullStr Development of Fluids for Chain Type CVTs
title_full_unstemmed Development of Fluids for Chain Type CVTs
title_short Development of Fluids for Chain Type CVTs
title_sort development of fluids for chain type cvts
topic chain cvtf
afm
metal friction
clutch friction
anti-seizure property
url https://www.jstage.jst.go.jp/article/trol/12/3/12_147/_pdf/-char/en
work_keys_str_mv AT toshiakiiwai developmentoffluidsforchaintypecvts
AT keiichinarita developmentoffluidsforchaintypecvts
AT mitsugukudo developmentoffluidsforchaintypecvts
AT masatoogawa developmentoffluidsforchaintypecvts