Each stage of the mechanism consists of a rotary sun gear, 1, 1' or 1"; symmetrically located planet gears, 2, 2' or 2"; a fixed internal gear, 3, 3' or 3"; and a carrier, 4, 4' or 4". The planet gears mesh with the corresponding sun gears and fixed internal gears. The carriers are connected by turning pairs to the corresponding planet gears. Sun gear 1 is keyed to shaft 5. Carrier 4 is rigidly attached to sun gear 1'; carrier 4' to sun gear 1" and carrier 4" is keyed to shaft 6. When gear 1 rotates about fixed axis A, carrier 4" rotates in the same direction about fixed axis B. The speeds n₁ and n₄″ o f gear 1 and carrier 4" (in rpm) satisfy the equation i₁₄″=n₁/n₄″=i₁₄×i₁'₄'×i₁''₄''=(1+z₃/z₁)(1+z₃'/z₁')(1+z₃''/z₁'') where z₁, z₁', z₁'', z₃, z₃' and z₃'' are the numbers of teeth of gears 1, 1', 1", 3, 3' and 3".
$2891$CxG,PR$