Patent ID: 8545362
Filing Date: 2013-10-01
Classification: F16H

Abstract:
1. A transmission comprising: input, output, and intermediate shafts; a first planetary gear set having a first sun gear, a first ring gear, a first carrier fixedly coupled to the input shaft, and a set of planet gears in continuous meshing engagement with the first sun gear and the first ring gear; a second planetary gear set having a second sun gear, a second ring gear, a second carrier fixedly coupled to the output shaft, and a set of planet gears in continuous meshing engagement with the second sun gear and the second ring gear; a third planetary gear set having a third sun gear fixedly coupled to the first ring gear, a third ring gear fixedly coupled to the second sun gear, a third carrier, and a set of planet gears in continuous meshing engagement with the third sun gear and the third ring gear; a fourth planetary gear set having a fourth sun gear, a fourth ring gear, a fourth carrier, and a set of planet gears in continuous meshing engagement with the fourth sun gear and the fourth ring gear; a first clutch configured such that when the first clutch is engaged i) the intermediate shaft is coupled to the third carrier and ii) the second sun gear is coupled to the third ring gear; a second clutch configured to selectively couple the first ring gear to the intermediate shaft; a third clutch configured to selectively couple the input shaft to the second sun gear; a fourth clutch configured to selectively couple the second ring gear to the intermediate shaft; and a first brake configured to selectively hold the first sun gear against rotation.