Multistep-automatic-transmission

摘要

An automatic transmission includes nine rotatable shafts and four planetary gear sets, each with a first, second and third element. For the shifting of multiple forward gears and one reverse gear, seven shift elements are provided. The second element of the fourth planetary gear set forms the first shaft designed as a drive shaft, the second element of the third planetary gear set forms the second shaft designed as an output shaft, the first element of the fourth planetary gear set forms the third shaft, one element of the planetary gear set forms the fourth shaft, the third element of the third planetary gear set forms the sixth shaft, the second element of the second planetary gear set forms the eighth shaft. The third element of the second planetary gear set and the first element of the third planetary gear set are connected to each other as the fifth shaft. The first element of the second planetary gear set and the third element of the fourth planetary gear set are connected to each other as the seventh shaft. The third shaft can be fixed through the first shift element. The fourth shaft is constantly and directly connected to the second shift element. The first shaft is connectable to the fifth shaft through the third shift element. The ninth shaft is not directly connected to any of the planetary gear sets, is connectable to the sixth shaft through the fourth shift element, is connectable to the seventh shaft through the fifth shift element, is connectable to the eighth shaft through the sixth shift element and is connectable to the first shaft through the seventh shift element.

主权项

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.