Patent ID: 8617022

Claim:
An automatic transmission, comprising: a first planetary gear set including a first sun gear, a first pinion, and a ring gear of the first planetary gear set, the first sun gear meshes with the first pinion, and the first pinion meshes with the first sun gear and with the ring gear of the first planetary gear set; a second planetary gear set including a second sun gear, a second pinion, and a common gear, the second sun gear meshes with the second pinion, and the second pinion meshes with the second sun gear and with the common gear; a third planetary gear set including a third sun gear, the second pinion, a third pinion, and the common gear, the third sun gear meshes with the third pinion, the third pinion meshes with the third sun gear and with the second pinion, and the second pinion meshes with the third pinion and with the common gear; and a fourth planetary gear set including the common gear, a fourth pinion, and a ring gear of the fourth planetary gear set, the common gear meshes with the fourth pinion, and the fourth pinion meshes with the common gear and with the ring gear of the fourth planetary gear set; wherein the second planetary gear set and the third planetary gear set form a Ravigneaux gear set, and the fourth planetary gear set is concentrically arranged with the second planetary gear set or with the third planetary gear set, the second and third planetary gear sets being radially inward of the fourth planetary gear set.