Patent ID: 9212729
Filing Date: 2015-12-15
Classification: F16H

Abstract:
1. An automatic transmission, comprising: a transmission housing; a plurality of planetary gear sets having a first planetary gear set, a second planetary gear set, a third planetary gear set and a fourth planetary gear set, a carrier of the first planetary gear set coupled to the transmission housing; and a plurality of rotatable shafts having an input shaft, an output shaft, a third shaft, a fourth shaft, a fifth shaft, a sixth shaft, a seventh shaft and an eight shaft, the input shaft connected to a sun gear of the fourth planetary gear set, the third shaft connected to a sun gear of the first planetary gear set, the fourth shaft connected to a carrier of the third planetary gear set, the fifth shaft connected to a carrier of the second planetary gear set, a ring gear of the third planetary gear set and a ring gear of the fourth planetary gear set, the sixth shaft connected to a ring gear of the second planetary gear set, the seventh shaft connected to a carrier of the fourth planetary gear set, the eighth shaft connected to a ring gear of the first planetary gear set, a sun gear of the second planetary gear set and a sun gear of the third planetary gear set; and a plurality of shifting elements having a first brake, a second brake, a first clutch, a second clutch, a third clutch and a fourth clutch, the first brake configured for selectively coupling the third shaft to the transmission housing, the second brake configured for selectively coupling the carrier of the first planetary gear set to the fourth shaft, the first clutch configured for selectively coupling the input shaft to the third shaft, the second clutch configured for selectively coupling the input shaft to the fourth shaft, the third clutch configured for selectively coupling the output shaft to the seventh shaft, the fourth clutch configured for selectively coupling the output shaft to the sixth shaft.