Planetary gear train of automatic transmission for vehicle
A planetary gear train of an automatic transmission for a vehicle may include: an input shaft; an output shaft disposed in parallel with the input shaft; a first planetary gear set having first, second, and third rotation elements; a second planetary gear set having fourth, fifth, and sixth rotation elements; a first shaft fixedly connected to the first rotation element and selectively connected to the input shaft and a transmission housing; a second shaft fixedly connected to the second rotation element; a third shaft fixedly connected to the third rotation element; a fourth shaft selectively connected to the input shaft; a fifth shaft fixedly connected to the fourth rotation element and fixedly connected to the output shaft; a sixth shaft fixedly connected to the fifth rotation element; and a seventh shaft fixedly connected to the sixth rotation element, selectively connected to the fifth shaft.
1. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
an input shaft receiving a torque of an engine;
an output shaft outputting a torque and disposed in parallel with the input shaft;
a first planetary gear set including first, second, and third rotation elements and disposed on a radially outer side of the input shaft;
a second planetary gear set including fourth, fifth, and sixth rotation elements and disposed on a radially outer side of the output shaft;
a first shaft fixedly connected to the first rotation element and selectively connected to the input shaft and a transmission housing, respectively;
a second shaft fixedly connected to the second rotation element and operably connected to the input shaft;
a third shaft fixedly connected to the third rotation element;
a fourth shaft selectively connected to the input shaft;
a fifth shaft fixedly connected to the fourth rotation element and the output shaft;
a sixth shaft fixedly connected to the fifth rotation element and operably connected to the fourth shaft; and
a seventh shaft fixedly connected to the sixth rotation element, selectively connected to the fifth shaft, and operably connected to the third shaft.
2. The planetary gear train of claim 1 , further comprising:
a first transfer gear set disposed between the third shaft and the seventh shaft and operably connecting the third shaft to the seventh shaft; and
a second transfer gear set disposed between the fourth shaft and the sixth shaft and operably connecting the fourth shaft to the sixth shaft.
3. The planetary gear train of claim 2 , wherein the second shaft is fixedly connected to the input shaft.
4. The planetary gear train of claim 3 , further comprising:
three clutches, each selectively connecting one shaft to another shaft selected among the input shaft and the seven shafts; and
a first brake selectively connecting the first shaft to the transmission housing.
5. The planetary gear train of claim 4 , wherein the three clutches comprise:
a first clutch disposed between the input shaft and the first shaft;
a second clutch disposed between the fifth shaft and the seventh shaft; and
a third clutch disposed between the input shaft and the fourth shaft.
6. The planetary gear train of claim 2 , wherein the second shaft is selectively connected to the input shaft.
7. The planetary gear train of claim 6 , further comprising:
four clutches, each selectively connecting one shaft to another shaft selected among the input shaft and the seven shafts; and
a first brake selectively connecting the first shaft to the transmission housing.
8. The planetary gear train of claim 7 , wherein the four clutches comprise:
a first clutch disposed between the input shaft and the first shaft;
a second clutch disposed between the fifth shaft and the seventh shaft;
a third clutch disposed between the input shaft and the fourth shaft; and
a fourth clutch disposed between the input shaft and the second shaft.
9. The planetary gear train of claim 7 , further comprising a second brake disposed between the second shaft and the transmission housing.
10. The planetary gear train of claim 1 , wherein the first planetary gear set is a single pinion planetary gear, the first rotation element is a first sun gear, the second rotation element is a first planet carrier, and the third rotation element is a first ring gear, and
wherein the second planetary gear set is a single pinion planetary gear, the fourth rotation element is a second sun gear, the fifth rotation element is a second planet carrier, and the sixth rotation element is a second ring gear.