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...
Main Authors: | , , , |
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Format: | Article |
Language: | English |
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Japanese Society of Tribologists
2017-07-01
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Series: | Tribology Online |
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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. |
first_indexed | 2024-12-14T16:05:15Z |
format | Article |
id | doaj.art-e5a090a545d44cf590eee0fc298552f4 |
institution | Directory Open Access Journal |
issn | 1881-2198 |
language | English |
last_indexed | 2024-12-14T16:05:15Z |
publishDate | 2017-07-01 |
publisher | Japanese Society of Tribologists |
record_format | Article |
series | Tribology Online |
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 |