Carrier 1 rotates about fixed axis A-A and is connected by a turning pair to planet gears 2 and 4 which are rigidly attached together. Gear 2 meshes with fixed sun gear 3 and gear 4 with gear 5 which rotates about axis A-A. For links 1 and 5 to be coaxial, the numbers of teeth of gears 2, 3, 4 and 5 should satisfy the condition (if the gears have the same module): z₂+z₃=z₄+z₅. The speeds n₁ and n₅ of carrier 1 and gear 5 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. For the relative sizes of the links shown, carrier 1 and gear 5 rotate in the same direction.
$2876$CxG,PR$