Planetary gear train of automatic transmission for 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 of the engine;
• a first planetary gear set including a first rotation element, a second rotation element, and a third rotation element;
• a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element;
• a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element;
• a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;
• first, second, third, fourth, fifth, sixth and seventh rotation shafts, each connected to at least one of the first to twelfth rotation elements,
• wherein the first rotation shaft is selectively connectable to the input shaft,
• wherein the third rotation shaft is selectively connectable to at least one of the input shaft and a transmission housing,
• wherein the fourth rotation shaft is selectively connectable to at least one of the input shaft and the transmission housing,
• wherein the fifth rotation shaft is connected to the input shaft directly,
• wherein the sixth rotation shaft is directly connected to the output shaft,
• wherein the seventh rotation shaft is selectively connectable to the transmission housing,
• wherein the first rotation shaft is directly connected to the fourth rotation element,
• wherein the second rotation shaft directly connects the third rotation element with the fifth rotation element and the seventh rotation element and is selectively connectable to the tenth rotation element,
• wherein the third rotation shaft directly connects the second rotation element with the sixth rotation element,
• wherein the fourth rotation shaft is directly connected to the first rotation element,
• wherein the fifth rotation shaft is directly connected to the eleventh rotation element and directly connected to the input shaft,
• wherein the sixth rotation shaft directly connects the eighth rotation element with the twelfth rotation element, and
• wherein the seventh rotation shaft is directly connected to the ninth rotation element,
• a first clutch selectively connecting the input shaft with the first rotation shaft;
• a second clutch selectively connecting the input shaft with the third rotation shaft;
• a third clutch selectively connecting the input shaft with the fourth rotation shaft;
• a fourth clutch selectively connecting the seventh rotation element with the tenth rotation element;
• a first brake selectively connecting the third rotation shaft with the transmission housing;
• a second brake selectively connecting the fourth rotation shaft with the transmission housing;
• and
• a third brake selectively connecting the seventh rotation shaft with 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 of the engine;
• a first planetary gear set including a first rotation element, a second rotation element, and a third rotation element;
• a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element;
• a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element;
• a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;
• and
• first, second, third, fourth, fifth, sixth and seventh rotation shafts, each connected to at least one of the first to twelfth rotation elements,
• wherein the first rotation shaft is selectively connectable to the input shaft,
• wherein the third rotation shaft is selectively connectable to at least one of the input shaft and a transmission housing,
• wherein the fourth rotation shaft is selectively connectable to at least one of the input shaft and the transmission housing,
• wherein the fifth rotation shaft is connected to the input shaft directly,
• wherein the sixth rotation shaft is directly connected to the output shaft,
• wherein the seventh rotation shaft is selectively connectable to the transmission housing,
• wherein the first rotation shaft is directly connected to the fourth rotation element,
• wherein the second rotation shaft directly connects the third rotation element with the fifth rotation element, the seventh rotation element, and the tenth rotation element,
• wherein the third rotation shaft directly connects the second rotation element with the sixth rotation element,
• wherein the fourth rotation shaft is directly connected to the first rotation element,
• wherein the fifth rotation shaft is directly connected to the eleventh rotation element and selectively connectable to the input shaft,
• wherein the sixth rotation shaft directly connects the eighth rotation element with the twelfth rotation element, and
• wherein the seventh rotation shaft is directly connected to the ninth rotation element,
• a first clutch selectively connecting the input shaft with the first rotation shaft;
• a second clutch selectively connecting the input shaft with the third rotation shaft;
• a third clutch selectively connecting the input shaft with the fourth rotation shaft;
• a fourth clutch selectively connecting the input shaft with the fifth rotation shaft;
• a first brake selectively connecting the third rotation shaft with the transmission housing;
• a second brake selectively connecting the fourth rotation shaft with the transmission housing;
• and
• a third brake selectively connecting the seventh rotation shaft with the transmission housing.