Patent ID: 8057351

Claim:
A planetary gear device ( 16 , 17 ) comprising: two sun gears ( 22 to 25 ) having different diameters, each of the sun gears meshing with double planet gears ( 20 A to 21 B) comprising a first gear teeth area ( 20 A 1 to 21 B 1 ) which interacts with a first sun gear ( 22 , 24 ) and with a second gear teeth area ( 20 A 2 to 21 B 2 ) which meshes a second sun gear ( 23 , 25 ), the double planet gears ( 20 A to 21 B) being continuous stepped helical gear wheels and crown circle diameters (d a1 , d a2 ) of the first and the second gear teeth areas ( 20 A 1 to 21 B 2 ) of the double planet gears ( 20 A to 21 B) and crown circle diameters of the sun gears ( 22 to 25 ) being adapted to one another so that pitch circle diameters (d w1 , d w2 ), between the double planet gears ( 20 A to 21 B) and the sun gears ( 22 to 25 ), are arranged in a center between the crown circle diameters (d a1 , d a2 ) and effective root diameters (d Nf1 , d Nf2 ) of the gear teeth areas ( 20 A 1 to 21 B 2 ) of the double planet gears ( 20 A to 21 B) and the sun gears ( 22 to 25 ).