Carrier 1 rotates about fixed axis A and is connected by turning pair B to rigidly attached planet gears 2 and 4 and by turning pair C to planet gear 5. Planet gear 2 meshes with fixed sun gear 3; planet gear 4 meshes with planet gear 5. The speeds n₁ and n₅ of carrier 1 and gear 5 (in rpm) satisfy the condition n₅= n₁(z₂z₅-z₃z₄/z₂z₅) where z₂, z₃, z₄ and z₅ are the numbers of teeth of gears 2, 3, 4 and 5.
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