Gear 1 rotates about fixed axis A and is rigidly attached to carrier 7. Gear 1 meshes with gear 2 which rotates about fixed axis C and is rigidly attached to gear 3. Gear 3 meshes with gear 4 which rotates freely about axis A and is rigidly attached to gear 5. Gear 5 meshes with planet gear 6 which is rigidly attached to planet gear 8 and is connected by a turning pair to carrier 7. Gear 8 meshes with internal gear 9 which rotates about fixed axis B. The speeds n₁ and n₉ of gears 1 and 9 (in rpm) are related by the equation n₉=n₁(z₅z₈)/(z₆z₉)(1-(z₁z₃)/(z₂z₄)+(z₆z₉)/(z₅z₈)) where z₁, z₂, z₃, z₄, z₅, z₆, z₈ and z₉ are the numbers of teeth of gears 1, 2, 3, 4, 5, 6, 8 and 9.
$2904$CxG,DR$