Patent ID: 7331895

Claim:
A composite planetary device, comprising: a planetary gear mechanism equipped with a sun gear, at least one planetary gear and an internal gear; and a planetary roller mechanism equipped with a sun roller, at least one planetary roller and a ring roller; wherein the sun gear and the sun roller are integrally rotated around a common rotating center axis, the corresponding planetary gear and the planetary roller are integrally rotated around a common planetary shaft, and the internal gear and the ring roller rotate integrally around the rotating center axis or can be fixed concentrically, wherein a radius of the sun roller is larger by (Δr 1 ) than a radius (r 1 ) of a working pitch circle of the sun gear, a radius of the planetary roller is smaller by (Δr 1 ) than a radius (r 21 ) of a working pitch circle of the planetary gear, the radius (r 21 ) of the working pitch circle of the planetary gear meshing with the sun gear is larger than a radius (r 23 ) of a working pitch circle of the planetary gear meshing with the internal gear.