Patent ID: 9611918
Date: 2017-04-04
CPC Classifications: F16H

Claim:
1. An automatic transmission, comprising: a housing; a plurality of shafts having a drive shaft, an output shaft, a third shaft, a fourth shaft, a fifth shaft, a sixth shaft, a seventh shaft, an eighth shaft and a ninth shaft; 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, each planetary gear set of the plurality of planetary gear sets comprising a first element, a second element and a third element; and a plurality of shifting elements having a first shifting element, a second shifting element, a third shifting element, a fourth shifting element, a fifth shifting element, a sixth shifting element and a seventh shifting element, wherein the second element of the fourth planetary gear set forms the drive shaft, the second element of the third planetary gear set forms the output shaft, the first element of the fourth planetary gear set forms the third shaft, one of the first, second or third elements of the first planetary gear set forms the fourth shaft, the third element of the second planetary gear set and the first element of the third planetary gear set are constantly connected to each other and form the fifth shaft, the third element of the third planetary gear set forms the sixth shaft, the first element of the second planetary gear set and the third element of the fourth planetary gear set are constantly connected to each other and form the seventh shaft, the second element of the second planetary gear set forms the eighth shaft, the first shifting element is configured for selectively coupling the third shaft to the housing, the fourth shaft is connected to the second shift element, the third shifting element is configured for selectively coupling the drive shaft to the fifth shaft, the ninth shaft is not directly connected to any of the planetary gear sets of the planetary gear sets, the fourth shifting element is configured for selectively coupling the ninth shaft to the sixth shaft, the fifth shifting element is configured for selectively coupling the ninth shaft to the seventh shaft, the sixth shifting element is configured for selectively coupling the ninth shaft to the eighth shaft, the first, second and third elements of the second planetary gear set rotating at a common rotational speed when the fifth and sixth shifting elements are closed, the seventh shifting element is configured for selectively coupling the drive shaft to the ninth shaft.