Speed Ratio Control of Half-Toroidal Traction Drive CVT (2nd Report, Attitude Angle Control by a Nut and Screw Set)

Hirohisa Tanaka, Noriko Kawasaki, Hisashi Machida

    Research output: Contribution to journalArticle

    Abstract

    Traction-drive continuously variable power transmission, CVT, changes its speed ratio through control of the side-slip force acting on the Hertzian ellipse. Usually it is controlled by a hydraulic servomechanism because of its easy control of equal torque transmission of rolling elements. Here a new type of mechanical servomechanism is proposed for reducing the auxiliary unit power waste. Side slip for the speed ratio change is controlled by a nut and screw set. The dynamic model of the servomechanism is reduced to a first order lag system. The time constant is inversely proportional to the screw lead and the disk rotational speed. The performance is tested by the CVT with input torque capacity of 38N∗m, input rotational speed of 4000 rpm and speed ratio range of 0.4 to 2.5.

    Original languageEnglish
    Pages (from-to)449-451
    Number of pages3
    JournalTransactions of the Japan Society of Mechanical Engineers Series C
    Volume61
    Issue number582
    DOIs
    Publication statusPublished - 1995 Jan 1

    Keywords

    • Continuously Variable Transmission
    • Machine Element
    • Mechanical Speed Ratio Control
    • Nut and Screw Servomechanism
    • Traction Drive

    ASJC Scopus subject areas

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

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