Patent ID: 7303497

Claim:
A dual planetary gear set transmission comprising: a first planetary gear set and second planetary gear set arranged in parallel, said first planetary gear set having a first sun gear and said second planetary gear set having a second sun gear, a first plurality of planet gears meshed with said first sun gear and a second plurality of planet gears meshed with said second sun gear, a first planet carrier and a second planet carrier, and a first ring gear meshed with said first plurality of planet gears, and a second ring gear meshed with said second plurality of planet gears; a non-rotating fixed axle for supporting said first planetary gear set and said second planetary gear set; and wherein said first sun gear and said second sun gear are identical, said first ring gear and said second ring gear are identical, and wherein said first planetary gear set transfers a gear movement to said second planetary gear set via said first ring gear meshed with said first plurality of planet gears and said second ring gear meshed with said second plurality of planet gears such that when providing a differential input a proportional differential angle is created between the first planetary gear set and the second planetary gear set.