Patent ID: 7108629

Claim:
A multi-stage planetary gear train comprising: an input shaft; an output shaft; a transmission case; an upper-side planetary gear set that has said input shaft and be capable of changing a rotational speed of said input shaft to output an output speed, said upper-side planetary gear set being a first planetary gear with a first sun gear, a first ring gear with internal teeth, a first outer pinion meshed with the first ring gear, a first inner pinion meshed with the first outer pinion and the first sun gear, and a first carrier rotatably supporting the first and second pinions; a lower-side planetary gear set that has said output shaft and receives the output speed to change a rotational speed of said output shaft, said lower-side planetary gear set having a first member, a second member, a third member, and a fourth member that are rotatable; wherein the first sun gear is connected with said input shaft, said first member being connected with the first ring gear at forward 1st speed, said second member being held to said transmission case by connection with the first carrier at the forward 1st speed and a reverse position and connected with said input shaft at forward speed higher than 3rd speed, said third member being held to said transmission case by connection with the first carrier at forward 2nd speed and connected with the first ring gear at the forward 3rd speed, said fourth member being connected with said output shaft.