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Advances in Tribology
Volume 2012, Article ID 476028, 8 pages
Research Article

Tribological Properties of Metal V-Belt Type CVT Lubricant

Lubricants Research Laboratory, Idemitsu Kosan Co., Ltd., 24-4 Anesakikaigan, Chiba, Ichihara-shi 299-0107, Japan

Received 26 July 2012; Accepted 11 September 2012

Academic Editor: Philippe Velex

Copyright © 2012 Keiichi Narita. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The priority for lubricant performance for metal V-belt-type CVT (B-CVTFs) should be the improvement of transmittable torque capacity between the belt and pulley plus excellent antishudder properties for lockup clutch used in B-CVTs. This study intends to investigate the effect of lubricant additives for improving these performances of B-CVTs. In addition, surface analysis techniques were utilized to gain a novel insight into the chemical composites and morphology of the tribofilms. As a result, it is vital for greater torque capacity to give higher boundary friction coefficient between the metal contacting interfaces, and the process of boundary lubricant film formation derived from antiwear additives used in B-CVTFs strongly impacts on the torque capacity. Moreover, it is found that a sort of lubricant formulation gave an excellent antishudder performance for wet clutch with keeping higher friction coefficient between the metals, which would result in improving the performance of B-CVTs.