Patent ID: 8864617

Claim:
A planetary differential reduction device for synchronously rotating and differentially rotating a first output shaft and a second output shaft, comprising: a first sun gear being fixed not to rotate; a second sun gear having a same number of teeth as the first sun gear and disposed adjacent to the first sun gear in a direction of a device axis; a first planetary gear meshed with the first sun gear; a second planetary gear having a same number of teeth as the first planetary gear and meshed with the second sun gear; a common planetary carrier for supporting the first planetary gear and the second planetary gear; a first internal gear meshed with the first planetary gear; and a second internal gear meshed with the second planetary gear and having a same number of teeth as the first internal gear, wherein the first internal gear is connected to a side of the first output shaft, the second internal gear is connected to a side of the second output shaft, and the second sun gear is an input element for inputting a rotation for differentially rotating the second output shaft with respect to the first output shaft, the planetary differential reduction device further comprising: a planetary reduction part connecting the second internal gear and the second output shaft, wherein the planetary reduction part comprises: a third sun gear integrally rotating with a second internal gear; a third planetary gear meshed with the third sun gear; a third internal gear meshed with the third planetary gear and rotating integrally with the first internal gear; and a planetary carrier for supporting the third planetary gear, and wherein the planetary carrier for supporting third planetary gear is connected to the second output shaft.