Friction wheel 1 rotates about fixed axis A and its external cylindrical surface contacts the faces of friction plates 2 and 3 which rotate about fixed axes B. The faces of plates 2 and 3 contact the elements of the cylindrical surface of friction wheel 4 which rotates about fixed axis C. The speeds n₁ and n₄ (in rpm) without slippage of wheels 1 and 4 are related by the condition: n₄=-n₁*(a/b) where b and a are the distances from centerlines d and e of wheels 1 and 4 to axis B. This relationship concerns only the central sections of wheels 1 and 4 through lines d and e. Slippage occurs at all other points of contact of wheels 1 and 4 with plates 2 and 3. Looking along their axes, wheels 1 and 4 rotate in opposite directions.
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