トラクションドライブ式無段変速機の変速制御

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  • Speed Ratio Control of a Half-Toroidal Traction Drive CVT.
  • トラクション ドライブシキ ムダン ヘンソクキ ノ ヘンソク セイギョ

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A continuously variable power transmission has potential for the improvement of fuel economy and cruising comfort as an automotive propulsion system. A traction drive CVT changes its speed ratio by the control of side slip force on the Hertzian contact area. This mechanism has the feature of equal torque transmission of every rolling element and low wasting power for the speed ratio change, but sometimes falls into self oscillation at high rotating speed. The paper shows the principle of the speed ratio changing mechanism of the half-toroidal CVT and highlights a digital compensation method for stabilization of the electrohydraulically operated speed ratio control mechanism.

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