Patent ID: 7955214

Claim:
An automatic transmission comprising: an input shaft; a first compound planetary gear having a first element, a second element, a third element, and a fourth element respectively corresponding in the order of arrangement to four elements that are sequentially arranged; a second compound planetary gear having a fifth element, a sixth element, a seventh element, and an eighth element sequentially arranged and respectively corresponding in the order of arrangement to four elements that are sequentially arranged; a second clutch for selectively transmitting rotation of the input shaft to the sixth element; a first clutch for selectively transmitting rotation of the input shaft to the eighth element; a first brake for selectively fixing the third element; a second brake for selectively fixing the fifth element; a third brake for selectively fixing the fourth element; a fourth brake for selectively fixing the sixth element; and an output shaft directly connected to the seventh element, and a third clutch for selectively transmitting rotation of the input shaft to the first element, wherein, in the first compound planetary gear: the first element is a second sun gear, the second element is a common ring gear that meshes with the second sun gear through a long pinion and a pinion, and also meshes with a first sun gear through one of the long pinion and the pinion, the third element is a common carrier that rotatably supports the long pinion and the pinion that intermesh with each other, and the fourth element is the first sun gear, and wherein the second element is directly connected to the fifth element.