Film Thickness and Traction in Soft EHL with Grease
Engineering plastic materials like polyamide and polyacetal are widely used for worm wheels and other tribological elements under EHL conditions with grease; typical examples are found in electrical power steering systems and power window mechanisms. Low elastic modulus of those materials makes thei...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Japanese Society of Tribologists
2017-08-01
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| Series: | Tribology Online |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/trol/12/4/12_171/_pdf/-char/en |
| _version_ | 1818568233513385984 |
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| author | Tsuyoshi Kochi Ryosuke Ichimura Michitaka Yoshihara Daming Dong Yoshitsugu Kimura |
| author_facet | Tsuyoshi Kochi Ryosuke Ichimura Michitaka Yoshihara Daming Dong Yoshitsugu Kimura |
| author_sort | Tsuyoshi Kochi |
| collection | DOAJ |
| description | Engineering plastic materials like polyamide and polyacetal are widely used for worm wheels and other tribological elements under EHL conditions with grease; typical examples are found in electrical power steering systems and power window mechanisms. Low elastic modulus of those materials makes their contact pressure much lower than steel-to-steel contact, and EHL of those contacts is called “soft EHL”. The current concern of this technology is higher reliability and lower friction losses, which mean maintaining sufficient EHL film thickness and reducing traction in tribological terms. The present work tries to measure soft EHL film thickness and traction of oil and grease by an optical interferometry EHL system, in which a steel ball was made contact with a transparent polycarbonate disk having a similar elasticity as the above-cited engineering plastic materials. The results show that prediction is possible by using the analyses by Dong and Qian for the film thickness and by Muraki and Kimura for the traction coefficient. |
| first_indexed | 2024-12-14T06:33:17Z |
| format | Article |
| id | doaj.art-bf803a47db46402999ce429cac3db851 |
| institution | Directory Open Access Journal |
| issn | 1881-2198 |
| language | English |
| last_indexed | 2024-12-14T06:33:17Z |
| publishDate | 2017-08-01 |
| publisher | Japanese Society of Tribologists |
| record_format | Article |
| series | Tribology Online |
| spelling | doaj.art-bf803a47db46402999ce429cac3db8512022-12-21T23:13:26ZengJapanese Society of TribologistsTribology Online1881-21982017-08-0112417117610.2474/trol.12.171trolFilm Thickness and Traction in Soft EHL with GreaseTsuyoshi Kochi0Ryosuke Ichimura1Michitaka Yoshihara2Daming Dong3Yoshitsugu Kimura4Grease Technology Dept., Kyodo Yushi Co., Ltd.Grease Technology Dept., Kyodo Yushi Co., Ltd.Reserch & Development Dept., Kyodo Yushi Co., Ltd.Reserch & Development Dept., Kyodo Yushi Co., Ltd.University of Tokyo and Kagawa UniversityEngineering plastic materials like polyamide and polyacetal are widely used for worm wheels and other tribological elements under EHL conditions with grease; typical examples are found in electrical power steering systems and power window mechanisms. Low elastic modulus of those materials makes their contact pressure much lower than steel-to-steel contact, and EHL of those contacts is called “soft EHL”. The current concern of this technology is higher reliability and lower friction losses, which mean maintaining sufficient EHL film thickness and reducing traction in tribological terms. The present work tries to measure soft EHL film thickness and traction of oil and grease by an optical interferometry EHL system, in which a steel ball was made contact with a transparent polycarbonate disk having a similar elasticity as the above-cited engineering plastic materials. The results show that prediction is possible by using the analyses by Dong and Qian for the film thickness and by Muraki and Kimura for the traction coefficient.https://www.jstage.jst.go.jp/article/trol/12/4/12_171/_pdf/-char/ensoft ehlgreasefilm thicknesstractionrheology |
| spellingShingle | Tsuyoshi Kochi Ryosuke Ichimura Michitaka Yoshihara Daming Dong Yoshitsugu Kimura Film Thickness and Traction in Soft EHL with Grease Tribology Online soft ehl grease film thickness traction rheology |
| title | Film Thickness and Traction in Soft EHL with Grease |
| title_full | Film Thickness and Traction in Soft EHL with Grease |
| title_fullStr | Film Thickness and Traction in Soft EHL with Grease |
| title_full_unstemmed | Film Thickness and Traction in Soft EHL with Grease |
| title_short | Film Thickness and Traction in Soft EHL with Grease |
| title_sort | film thickness and traction in soft ehl with grease |
| topic | soft ehl grease film thickness traction rheology |
| url | https://www.jstage.jst.go.jp/article/trol/12/4/12_171/_pdf/-char/en |
| work_keys_str_mv | AT tsuyoshikochi filmthicknessandtractioninsoftehlwithgrease AT ryosukeichimura filmthicknessandtractioninsoftehlwithgrease AT michitakayoshihara filmthicknessandtractioninsoftehlwithgrease AT damingdong filmthicknessandtractioninsoftehlwithgrease AT yoshitsugukimura filmthicknessandtractioninsoftehlwithgrease |