Influence of traction oil on power loss of cylindrical gears

Kunihiko Morikawa, Mikio Nagahara, Ryuta Nishihara, Susumu Matsumoto

    Research output: Contribution to journalArticlepeer-review


    Most transmissions that use a traction drive mechanism also have a gear train to transmit power to the outside. In these transmissions, traction oil is used both as the working fluid and gear lubricant. Since precedence is given to the performance of traction oil as a working fluid, its performance as a lubricant is generally inferior. The traction coefficient of traction oil is higher than that of automatic transmission fluids (ATFs), so it is thought that the power loss of meshing gears under traction oil will be larger than that under ATF. In this paper, we experimentally compare the power loss of meshing gears between use with traction oil and with ATF and show that the power loss with the former increases by approximately 0.5% compared with that found for ATF. And also, it is shown that the magnitude of the power loss depends on the gear dimensions and operating conditions. The one of authors proposed the new estimation formula of friction coefficient and confirmed the usefulness of this formula under ATFs. In this paper, the usefulness of proposed estimation formula is also confirmed under traction oil.

    Original languageEnglish
    Pages (from-to)2609-2621
    Number of pages13
    JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
    Issue number803
    Publication statusPublished - 2013


    • Friction Coefficient
    • Gear
    • Helical Gear
    • Mesh Efficiency
    • Mesh Power Loss
    • Minimum Oil Film Thickness
    • Tooth Surface Roughness
    • Traction Oil

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Mechanics of Materials
    • Industrial and Manufacturing Engineering


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