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A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation shaft, a third rotation shaft selectively connected to the transmission housing, a fourth rotation shaft, a fifth rotation shaft directly connected to the input shaft, a sixth rotation shaft selectively connected to the fourth rotation shaft or the fifth rotation shaft, a seventh rotation shaft selectively connected to the fourth rotation shaft, and an eighth rotation shaft directly connected to the output shaft, and selectively connected to the seventh rotation shaft.

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque of the engine, a first planetary gear set including first, second, and third rotation elements, a second planetary gear set including fourth, fifth, and sixth rotation elements, a third planetary gear set including seventh, eighth, and ninth rotation elements, a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements, and six friction elements selectively connecting the rotation elements, or selectively connecting at least one rotation element and a transmission housing.

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque of the engine, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation shaft, a third rotation shaft selectively connected to the transmission housing, a fourth rotation shaft directly connected to the input shaft, a fifth rotation shaft, a sixth rotation shaft selectively connected to the second and fourth rotation shafts, a seventh rotation shaft selectively connected the second rotation shaft, an eighth rotation shaft selectively connected to the seventh rotation shaft, and directly connected to the output shaft, and six friction elements disposed to selectively connect the rotation shafts and selectively connect the rotation shafts with the transmission housing.

A planetary gear train of an automatic transmission may include: an input shaft; an output shaft; first to third planetary gear sets and six control elements disposed between rotating elements, and disposed at portions where rotating elements are selectively connected to transmission housing, first rotating shaft including first rotating element and ninth rotating element and selectively connected with input shaft; second rotating shaft including second rotating element and fourth rotating element; third rotating shaft including third rotating element and selectively connected with input shaft or transmission housing; fourth rotating shaft including fifth rotating element; fifth rotating shaft including sixth rotating element and directly connected with transmission housing; sixth rotating shaft including seventh rotating element and selectively connected with second rotating shaft or fourth rotating shaft; and seventh rotating shaft including eighth rotating element and selectively connected with second rotating shaft and simultaneously and is directly connected with output shaft.

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting torque of the engine, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first shaft selectively connectable to the input shaft, a second shaft, a third shaft selectively connectable to the input shaft, a fourth shaft, a fifth shaft, a sixth shaft directly connected to the output shaft, and a seventh shaft selectively connectable to the input shaft.

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting torque of the engine, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first shaft, a second shaft, a third shaft selectively connectable to at least one of the input shaft and a transmission housing, a fourth shaft selectively connectable to the input shaft, a fifth shaft selectively connectable to the input shaft, a sixth shaft directly connected to the output shaft, and a seventh shaft.

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation shaft, a third rotation shaft selectively connected to the transmission housing, a fourth rotation shaft directly connected to the input shaft, a fifth rotation shaft, a sixth rotation shaft selectively connected to the second rotation shaft or the fifth rotation shaft, a seventh rotation shaft selectively connected to the input shaft, and an eighth rotation shaft directly connected to the output shaft, and selectively connected to the sixth rotation shaft.