Planetary gear train of automatic transmission for a vehicle

A planetary gear train of an automatic transmission for a vehicle, comprising:

• an input shaft receiving torque of an engine;
• an output shaft outputting changed torque;
• a first planetary gear set being a single-pinion planetary gear set, and including first, second, and third rotation elements;
• a second planetary gear set being a single-pinion planetary gear set, and including fourth, fifth and sixth rotation elements;
• and
• a third planetary gear set being a single-pinion planetary gear set, and including seventh, eighth and ninth rotation elements;
• a first rotation shaft including the first and ninth rotation elements and selectively connected to the input shaft;
• a second rotation shaft including the second rotation element;
• a third rotation shaft including the third rotation element and selectively connected to the input shaft or the transmission housing;
• a fourth rotation shaft including the fourth rotation element and selectively connected to the second rotation shaft;
• a fifth rotation shaft including the fifth and seventh rotation elements and selectively connected to the second rotation shaft;
• a sixth rotation shaft including the sixth rotation element and directly connected to the transmission housing;
• a seventh rotation shaft including the eighth rotation element and selectively connected to the second rotation shaft, and directly connected to the output shaft;
• a first clutch selectively connecting the input shaft and the first rotation shaft;
• a second clutch selectively connecting the input shaft and third rotation shaft;
• a third clutch selectively connecting the second rotation shaft and the seventh rotation shaft;
• a fourth clutch selectively connecting the second rotation shaft and the fourth rotation shaft;
• a fifth clutch selectively connecting the second rotation shaft and the fifth rotation shaft;
• and
• a first brake selectively connecting the third rotation shaft and the transmission housing.

A planetary gear train of an automatic transmission for a vehicle, comprising:

• an input shaft receiving torque of an engine;
• an output shaft outputting changed torque;
• a first planetary gear set being a single-pinion planetary gear set, and including first sun gear, a first ring gear, and a first planet carrier as rotation elements;
• a second planetary gear set being a single-pinion planetary gear set, and including a second sun gear, a second ring gear and a second planet carrier as rotation elements;
• and
• a third planetary gear set being a single-pinion planetary gear set, and including a third sun gear, a third ring gear and a third planet carrier as rotation elements;
• a first rotation shaft including the first sun gear and the third ring gear and selectively connected to the input shaft;
• a second rotation shaft including the first planet carrier;
• a third rotation shaft including the first ring gear and selectively connected to the input shaft or a transmission housing;
• a fourth rotation shaft including the second sun gear and selectively connected to the second rotation shaft;
• a fifth rotation shaft including the second planet carrier and the third sun gear and selectively connected to the second rotation shaft;
• a sixth rotation shaft including the second ring gear and directly connected to the transmission housing;
• a seventh rotation shaft including the third planet carrier and selectively connected to the second rotation shaft and directly connected to the output shaft;
• and
• six friction elements disposed to selectively connect the rotation elements with each other and selectively connect the rotation elements with a transmission housing.