Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing
To improve the transmission efficiency of a continuously variable transmission (CVT) system, it is effective to form a tribofilm with higher friction coefficient. Therefore, understanding of the correlation between the tribofilm formation and friction coefficient in a CVT fluid has been a great deal...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Japanese Society of Tribologists
2019-11-01
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| Series: | Tribology Online |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/trol/14/4/14_208/_pdf/-char/en |
| _version_ | 1818751543772446720 |
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| author | Ayako Omura Atsushi Korenaga Hiroki Mano Tsuguyori Ohana Akira Sugimura Akira Mizuno Yoshiyuki Tanaka Makoto Maeda Kazumasa Uchida |
| author_facet | Ayako Omura Atsushi Korenaga Hiroki Mano Tsuguyori Ohana Akira Sugimura Akira Mizuno Yoshiyuki Tanaka Makoto Maeda Kazumasa Uchida |
| author_sort | Ayako Omura |
| collection | DOAJ |
| description | To improve the transmission efficiency of a continuously variable transmission (CVT) system, it is effective to form a tribofilm with higher friction coefficient. Therefore, understanding of the correlation between the tribofilm formation and friction coefficient in a CVT fluid has been a great deal. In this study, the tribofilm formation on a bearing steel ball surface under the simulated additive oil was investigated. We used ball-on-disk tribological test and optical microscopy imaging to observe the temporal changes in the tribofilm growth. Atomic force microscopy and energy-dispersive X-ray spectrometry analyses revealed that the tribofilm consisted of pad-like structures derived by tricresyl phosphate and calcium sulfonate additives. A binary imaging analysis showed that the total area of the pad-like structure was a key parameter determining the friction coefficient. The pads were repeatedly desorbed and reformed during the sliding test. These results improve the design of future CVT systems and lubricants. |
| first_indexed | 2024-12-18T04:37:15Z |
| format | Article |
| id | doaj.art-123bbf9eb6ce4720bac50ceaa4cba795 |
| institution | Directory Open Access Journal |
| issn | 1881-2198 |
| language | English |
| last_indexed | 2024-12-18T04:37:15Z |
| publishDate | 2019-11-01 |
| publisher | Japanese Society of Tribologists |
| record_format | Article |
| series | Tribology Online |
| spelling | doaj.art-123bbf9eb6ce4720bac50ceaa4cba7952022-12-21T21:20:49ZengJapanese Society of TribologistsTribology Online1881-21982019-11-0114420821310.2474/trol.14.208trolCorrelation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of RubbingAyako Omura0Atsushi Korenaga1Hiroki Mano2Tsuguyori Ohana3Akira Sugimura4Akira Mizuno5Yoshiyuki Tanaka6Makoto Maeda7Kazumasa Uchida8National Institute of Advanced Industrial Science and Technology (AIST)National Institute of Advanced Industrial Science and Technology (AIST)National Institute of Advanced Industrial Science and Technology (AIST)National Institute of Advanced Industrial Science and Technology (AIST)JATCO LtdJATCO LtdJATCO LtdJATCO LtdJATCO LtdTo improve the transmission efficiency of a continuously variable transmission (CVT) system, it is effective to form a tribofilm with higher friction coefficient. Therefore, understanding of the correlation between the tribofilm formation and friction coefficient in a CVT fluid has been a great deal. In this study, the tribofilm formation on a bearing steel ball surface under the simulated additive oil was investigated. We used ball-on-disk tribological test and optical microscopy imaging to observe the temporal changes in the tribofilm growth. Atomic force microscopy and energy-dispersive X-ray spectrometry analyses revealed that the tribofilm consisted of pad-like structures derived by tricresyl phosphate and calcium sulfonate additives. A binary imaging analysis showed that the total area of the pad-like structure was a key parameter determining the friction coefficient. The pads were repeatedly desorbed and reformed during the sliding test. These results improve the design of future CVT systems and lubricants.https://www.jstage.jst.go.jp/article/trol/14/4/14_208/_pdf/-char/entribofilmlubricant additivescontinuously variable transmissionboundary lubrication |
| spellingShingle | Ayako Omura Atsushi Korenaga Hiroki Mano Tsuguyori Ohana Akira Sugimura Akira Mizuno Yoshiyuki Tanaka Makoto Maeda Kazumasa Uchida Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing Tribology Online tribofilm lubricant additives continuously variable transmission boundary lubrication |
| title | Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing |
| title_full | Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing |
| title_fullStr | Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing |
| title_full_unstemmed | Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing |
| title_short | Correlation between Tribofilm Formation and Friction Coefficient in Continuously Variable Transmission at the Initial Stage of Rubbing |
| title_sort | correlation between tribofilm formation and friction coefficient in continuously variable transmission at the initial stage of rubbing |
| topic | tribofilm lubricant additives continuously variable transmission boundary lubrication |
| url | https://www.jstage.jst.go.jp/article/trol/14/4/14_208/_pdf/-char/en |
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