Two gears of equal size, 3 and 5, are keyed to axle shafts A and B, and each meshes with two planet gears, 2 or 4, all of equal size, which are connected by turning pairs C and D to carrier 1, designed as a housing that rotates about axle shafts A and B. The face width of each planet gear 2 is sufficient to enable it to mesh with sun gears 3, and with its paired planet gear 4 which, in turn, meshes with the other sun gear 5. Axle shafts A and B are connected to the driving links of the mechanism. When the driving links rotate at the same speed in the same direction, housing 1 rotates at the same speed as sun gears 3 and 5. If the driving links have different speeds, then, when sun gears 3 and 5 rotate, planet gears 2 and 4 rotate about axes C and D. The speeds n₃, n₅ and n₁ of gears 3 and 5, and housing 1 (in rpm) are related by the equation n₁=(n₃+n₅)/2.
$2908$CxG,DR$