Multi-stage transmission for vehicle

A multi-stage transmission for a vehicle, comprising:

• first, second, third and fourth planetary gear devices each having three rotating elements;
• six shifting elements configured to variably provide frictional forces;
• and
• first, second, third, fourth, fifth, sixth, seventh and eighth rotary shafts connected to the rotating elements of the first, second, third and fourth planetary gear devices,
• wherein the first rotary shaft is an input shaft directly connected to a first rotating element of the first planetary gear device and a second rotating element of the third planetary gear device, the second rotary shaft is directly connected to a second rotating element of the first planetary gear device, the third rotary shaft is directly connected to a third rotating element of the first planetary gear device and a second rotating element of the second planetary gear device, the fourth rotary shaft is directly connected to a third rotating element of the second planetary gear device, the fifth rotary shaft is directly connected to a first rotating element of the second planetary gear device, the sixth rotary shaft is directly connected to a first rotating element of the third planetary gear device, the seventh rotary shaft is directly connected to the first rotating element of the fourth planetary gear device, and the eighth rotary shaft is an output shaft directly connected to a third rotating element of the third planetary gear device and a second rotating element of the fourth planetary gear device;
• and
• wherein the six shifting elements include first, second, third, fourth, fifth and sixth clutches, the first clutch is disposed between the second rotary shaft and a transmission case, the second clutch is disposed between the second rotary shaft and the fifth rotary shaft, the third clutch is disposed between the second rotary shaft and the fourth rotary shaft, the fourth clutch is disposed between the third rotary shaft and the sixth rotary shaft, the fifth clutch is disposed between the fifth rotary shaft and the sixth rotary shaft, and the sixth clutch is disposed between the fourth rotary shaft and the seventh rotary shaft.