Patent ID: 7662061

Claim:
A transmission capable of performing a gearchange between an input shaft and an output shaft, comprising: (a) a sun gear operatively connected to said input shaft or said output shaft; (b) a planetary gear group including two or more multi-stage planetary gears equipped with a plurality of gears each of which has a different number of teeth, said plurality of gears including a specific gear which meshes with said sun gear, and being added to another gear which has the same number of teeth as said specific gear and meshes only with said sun gear; (c) a carrier rotatably holding each of said two or more multi-stage planetary gears; (d) an internal gear group including internal gears which mesh with each of said plurality of gears in each of said two or more multi-stage planetary gears; and (e) a braking selector which makes braking force act selectively on a rotating motion of each of said internal gears, said braking selector including a braking force changer which changes a free state, a restriction state and a stop state with regard to rotation of each of said internal gears by changing said braking force.