Gear 1 is keyed to (or integral with) shaft A and meshes with planet gears 2 which, in turn, mesh with fixed internal gear 4. Carriers 6 and 7 are keyed to shaft B. Planet gears 3 mesh with fixed sun gear 8 and with internal gear 5 which rotates freely about shaft B. Thus, driving shaft A transmits rotation in the same direction to two driven links, shaft B and gear 5. The speeds n₁, n₅ and n₇ of gears 1 and 5 and carrier 7 (in rpm) are related by the equations n₅=n₁(z₁/z₅)((z₅+z₈)/(z₁+z₄)) and n₇=n₁(z₁/z₁+z₄) where z₁, z₄, z₅ and z₈ are the numbers of teeth of gears 1, 4, 5 and 8.
$2889$CxG,PR$