Planetary gear train of automatic transmission for vehicles

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

an input shaft for receiving an engine torque;

an output shaft for outputting a shifted torque;

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;

a first shaft integrally connected with the first rotation element and selectively connectable with a transmission housing;

a second shaft integrally connected with the second rotation element and the sixth rotation element;

a third shaft integrally connected with the third rotation element and the seventh rotation element;

a fourth shaft integrally connected with the fourth rotation element and the twelfth rotation element and directly connected with the input shaft;

a fifth shaft integrally connected with the fifth rotation element, and selectively connectable with the third shaft, and selectively connectable with the transmission housing;

a sixth shaft integrally connected with the eighth rotation element, and selectively connectable with at least one of the first shaft and the fourth shaft;

a seventh shaft integrally connected with the ninth rotation element and the eleventh rotation element, and directly connected with the output shaft; and

an eighth shaft integrally connected with the tenth rotation element, and selectively connectable with the sixth shaft,

wherein a first forward speed formed by operation of a fourth clutch and first and second brakes;

wherein a second forward speed formed by operation of a second clutch, the fourth clutch and the second brake;

wherein a third forward speed formed by operation of the second and fourth clutches and the first brake;

wherein a fourth forward speed formed by operation of the second clutch and a third clutch and the first brake;

wherein a fifth forward speed formed by operation of the second and third clutches and the second brake;

wherein a sixth forward speed formed by operation of a first clutch and the second and third clutches;

wherein a seventh forward speed formed by operation of the first and third clutches and the second brake;

wherein an eighth forward speed formed by operation of the first and third clutches and the first brake;

wherein a ninth forward speed formed by operation of the first clutch and the first and second brakes;

wherein a tenth forward speed formed by operation of the first clutch and a fourth clutch and the first brake; and

wherein a reverse speed formed by operation of the third and fourth clutches and the second brake.

2. The planetary gear train of claim 1 , wherein

the first planetary gear set comprises a single pinion planetary gear set, where 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;

the second planetary gear set comprises a single pinion planetary gear set, where 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;

the third planetary gear set comprises a single pinion planetary gear set, where the seventh rotation element is a third sun gear, the eighth rotation element is a third planet carrier, and the ninth rotation element is a third ring gear; and

the fourth planetary gear set is a single pinion planetary gear set, where the tenth rotation element is a fourth sun gear, the eleventh rotation element is a fourth planet carrier, and the twelfth rotation element is a fourth ring gear.

3. The planetary gear train of claim 1 , wherein:

the first clutch selectively connects the fourth shaft and the sixth shaft;

the second clutch selectively connects the sixth shaft and the eighth shaft;

the third clutch selectively connects the third shaft and the fifth shaft;

the fourth clutch selectively connects the first shaft and sixth shaft;

the first brake selectively connects the fifth shaft and the transmission housing; and

the second brake selectively connects the first shaft and the transmission housing.

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

an input shaft for receiving an engine torque;

an output shaft for outputting a shifted torque;

a first planetary gear set as a single pinion planetary gear set including a first rotation element, a second rotation element, and a third rotation element;

a second planetary gear set as a single pinion planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element;

a third planetary gear set as a single pinion planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element;

a fourth planetary gear set as a single pinion planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;

a first shaft integrally connected with the first rotation element, and selectively connectable with a transmission housing;

a second shaft integrally connected with the second rotation element and the sixth rotation element;

a third shaft integrally connected with the third rotation element and the seventh rotation element;

a fourth shaft integrally connected with the fourth rotation element and the twelfth rotation element, and directly connected with the input shaft;

a fifth shaft integrally connected with the fifth rotation element, and selectively connectable with the third shaft, and selectively connectable with the transmission housing;

a sixth shaft integrally connected with the eighth rotation element, and selectively connectable with the at least one of the first shaft and the fourth shaft;

a seventh shaft integrally connected with the ninth rotation element and the eleventh rotation element, and directly connected with the output shaft;

an eighth shaft integrally connected with the tenth rotation element, and selectively connectable with the sixth shaft;

a first clutch selectively connecting the fourth shaft and the sixth shaft;

a second clutch selectively connecting the sixth shaft and the eighth shaft;

a third clutch selectively connecting the third shaft and the fifth shaft;

a fourth clutch selectively connecting the first shaft and sixth shaft;

a first brake selectively connecting the fifth shaft and the transmission housing; and

a second brake selectively connecting the first shaft and the transmission housing,

wherein a first forward speed formed by operation of the fourth clutch and the first and second brakes;

wherein a second forward speed formed by operation of the second and fourth clutches and the second brake;

wherein a third forward speed formed by operation of the second and fourth clutches and the first brake;

wherein a fourth forward speed formed by operation of the second and third clutches and the first brake;

wherein a fifth forward speed formed by operation of the second and third clutches and the second brake;

wherein a sixth forward speed formed by operation of the first, second, and third clutches;

wherein a seventh forward speed formed by operation of the first and third clutches and the second brake;

wherein an eighth forward speed formed by operation of the first and third clutches and the first brake;

wherein a ninth forward speed formed by operation of the first clutch and the first and second brakes;

wherein a tenth forward speed formed by operation of the first and fourth clutches and the first brake; and

wherein a reverse speed formed by operation of the third and fourth clutches and the second brake.

5. The planetary gear train of claim 4 , wherein

the first planetary gear set includes a first sun gear as the first rotation element, a first planet carrier as the second rotation element, and a first ring gear as the third rotation element;

the second planetary gear set includes a second sun gear as the fourth rotation element, a second planet carrier as the fifth rotation element, and a second ring gear as the sixth rotation element;

the third planetary gear set includes a third sun gear as the seventh rotation element, a third planet carrier as the eighth rotation element, and a third ring gear as the ninth rotation element; and

the fourth planetary gear set includes a fourth sun gear as the tenth rotation element, a fourth planet carrier as the eleventh rotation element, and a fourth ring gear as the twelfth rotation element.

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

an input shaft for receiving an engine torque;

an output shaft for outputting a shifted torque;

a first planetary gear set as a single pinion planetary gear set including a first sun gear, a first planet carrier, and a first ring gear;

a second planetary gear set as a single pinion planetary gear set including a second sun gear, a second planet carrier, and a second ring gear;

a third planetary gear set as a single pinion planetary gear set including a third sun gear, a third planet carrier, and a third ring gear;

a fourth planetary gear set as a single pinion planetary gear set including a fourth sun gear, a fourth planet carrier, and a fourth ring gear;

a first shaft integrally connected with the first rotation element, and selectively connectable with a transmission housing;

a second shaft integrally connected with the second rotation element and the sixth rotation element;

a third shaft integrally connected with the third rotation element and the seventh rotation element;

a fourth shaft integrally connected with the fourth rotation element and the twelfth rotation element, and directly connected with the input shaft;

a fifth shaft integrally connected with the fifth rotation element, and selectively connectable with the third shaft, and selectively connectable with the transmission housing;

a sixth shaft integrally connected with the eighth rotation element, and selectively connectable with at least one of the first shaft and the fourth shaft;

a seventh shaft integrally connected with the ninth rotation element and the eleventh rotation element, and directly connected with the output shaft;

an eighth shaft integrally connected with the tenth rotation element, and selectively connectable with the sixth shaft; and

wherein a first forward speed formed by operation of a fourth clutch and first and second brakes;

wherein a second forward speed formed by operation of a second clutch and the fourth clutch and the second brake;

wherein a third forward speed formed by operation of the second and fourth clutches and the first brake;

wherein a fourth forward speed formed by operation of the second clutch and a third clutch and the first brake;

wherein a fifth forward speed formed by operation of the second and third clutches and the second brake;

wherein a sixth forward speed formed by operation of the first and second clutches and the third clutch;

wherein a seventh forward speed formed by operation of the first and third clutches and the second brake;

wherein an eighth forward speed formed by operation of the first and third clutches and the first brake;

wherein a ninth forward speed formed by operation of the first clutch and the first and second brakes;

wherein a tenth forward speed formed by operation of the first clutch, a fourth clutch and the first brake; and

wherein a reverse speed formed by operation of the third and fourth clutches and the second brake.

7. The planetary gear train of claim 6 , wherein:

the first clutch selectively connects the fourth shaft and the sixth shaft;

the second clutch selectively connects the sixth shaft and the eighth shaft;

the third clutch selectively connects the third shaft and the fifth shaft;

the fourth clutch selectively connects the first shaft and sixth shaft;

the first brake selectively connects the fifth shaft and the transmission housing; and

the second brake selectively connects the first shaft and the transmission housing.