Patent ID: 8100809
Filing Date: 2012-01-24
Classification: F16H

Abstract:
1. An automatic transmission comprising: a transmission case; an input shaft; an output shaft; an intermediate shaft; a simplex planetary gear set that increases the rotational speed of the input shaft, the simplex planetary gear set including a first carrier directly coupled to the input shaft, a sun gear fixed to the transmission case, and a first ring gear that outputs rotation at the increased speed and that is directly coupled to the intermediate shaft; and a duplex planetary gear set having first, second, third and fourth elements, and wherein the first element is selectively coupled to the input shaft via a third clutch and is selectively fixed via a first brake; wherein the second element is selectively coupled to the intermediate shaft via a second clutch and is selectively fixed via a second brake; wherein the third element is directly coupled to the output shaft; wherein the fourth element is selectively coupled to the input shaft via a first clutch; and wherein the duplex planetary gear set includes second and third sun gears, a long pinion directly in mesh with the second sun gear and meshing with the third sun gear via an intermediate pinion, a common carrier that supports the long pinion and the intermediate pinion, and a common ring gear that meshes with the long pinion, and wherein the second sun gear is the first element, the common carrier is the second element, the common ring gear is the third element, and the third sun gear is the fourth element.