Patent ID: 7377875

Claim:
A planetary gear apparatus comprising: an input sun gear and an output sun gear supported coaxially; a plurality of integrated pairs of an input side planetary gear meshing with an outer periphery of said input sun gear and an output side planetary gear meshing with an outer periphery of said output sun gear; a carrier supporting a plurality of spindles commonly and pivotably supporting each integrated pair of said input side planetary gear and said output side planetary gears; a first adjusting device for adjusting a backlash between said input side planetary gear and said input sun gear, or a backlash between each of said output side planetary gears and said output sun gear by pressing said carrier from one side in the axial length direction to another side and moving each of said input side planetary gears or each of said output side planetary gears; and a second adjusting device for adjusting a backlash between said output sun gear and each of said output side planetary gears, or a backlash between said input sun gear and each of said input side planetary gears by pressing said output sun gear or said input sun gear from one side in the axial length direction to another side and moving it, wherien the planetary gear apparatus transfers rotation of said input sun gear to said output sun gear while changing gear ratio in stepless manner by rotating said carrier in both forward and reverse directions, and continuously shifted gears which change an amount of addendum modification continuously in the axial length direction are used as said input sun gear, said output sun gear, each of said input side planetary gears and each of said output side planetary gears.