Multi-ratio transmission

A multi-stage automatic transmission for a motor vehicle, the transmission comprising:

• an input drive shaft (1) and an output shaft (2);
• first, second, third and fourth planetary gear sets (P1, P2, P3) being arranged in a housing (G), and each of the first, the second, the third and the fourth planetary gear sets comprising a sun gear, a ring gear and a carrier;
• at least third, fourth, fifth, sixth, seventh and eighth rotatable shafts (3, 4, 5, 6, 7, 8);
• at least five shift elements (03, 04, 15, 27, 56, 57, 67) comprising first and second brakes (03, 04) and first, second, and third clutches (15, 27, 56, 57, 67) whose selective engagement results in different transmission ratios between the input drive shaft (1) and the output shaft (2) so that eight forward gears and one reverse gear are implementable;
• the third shaft (3) being connected to both the sun gear of the first planetary gear set (P1) the ring gear of the third planetary gear set (P3), and the third shaft (3) being couplable, by the first brake (03), to the housing (G);
• the input drive shaft (1) being connected to the carrier of the first planetary gear set (P1), the input drive shaft (1) being detachably connected, by the first clutch (15), to the fifth shaft (5), and the fifth shaft (5) being connected to both the ring gear of the second planetary gear set (P2) and the sun gear of the third planetary gear set (P3);
• the sixth shaft (6) being connected to both the ring gear of the first planetary gear set (P1) and the sun gear of the second planetary gear set (P2);
• the eighth shaft (8) being connected to the carrier of the third planetary gear set (P3) and the sun gear of the fourth planetary gear set (P4);
• the fourth shaft (4) being connected to the carrier of the fourth planetary gear set (P4), and the fourth shaft (4) being couplable, by the second brake (04), to the housing (G);
• the output shaft (2) being connected to the ring gear of the fourth planetary gear set (P4), the output shaft (2) being detachably connected by the second clutch (27) to the seventh shaft (7), and the seventh shaft (7) being connected to the carrier of the second planetary gear set (P2);
• and
• the third clutch (56, 67, 57) being engagable to block the second planetary gear set (P2).

A multi-stage automatic transmission for a motor vehicle, the transmission comprising:

• an input drive shaft (1) and an output shaft (2);
• first, second, third and fourth planetary gear sets (P1, P2, P3) being arranged in a housing (G), and each of the first, the second, the third and the fourth planetary gear sets comprising a sun gear, a ring gear and a carrier;
• at least third, fourth, fifth, sixth, seventh and eighth rotatable shafts (3, 4, 7, 8);
• at least five shift elements (03, 04, 15, 27, 56, 57, 67) comprising first and second brakes (03, 04) and first, second and third clutches (15, 27, 56, 57, 67), selective engagement of the at least five shift elements results in different transmission ratios between the input drive shaft (1) and the output shaft (2) such that eight forward gears and one reverse gear are implementable;
• the input drive shaft (1) being continuously connected to the carrier of the first planetary gear set (P1) and the input drive shaft (1) being connectable, via the first clutch (15), to the fifth shaft (5);
• the output shaft (2) being continuously connected to the ring gear of the fourth planetary gear set (P4), and the output shaft (2) being connectable, via the second clutch (27), to the seventh shaft (7);
• the third shaft (3) being continuously connected to both the sun gear of the first planetary gear set (P1) and the ring gear of the third planetary gear set (P3), and the third shaft (3) being connectable, via the first brake (03), to the housing (G);
• the fourth shaft (4) being continuously connected to the carrier of the fourth planetary gear set (P4), and the fourth shaft (4) being connectable, via the second brake (04), to the housing (G);
• the fifth shaft (5) being continuously connected to the ring gear of the second planetary gear set (P2) and the sun gear of the third planetary gear set (P3);
• the sixth shaft (6) being continuously connected to the ring gear of the first planetary gear set (P1) and the sun gear of the second planetary gear set (P2);
• the seventh shaft (7) being continuously connected to the carrier of the second planetary gear set (P2);
• the eighth shaft (8) being continuously connected to the carrier of the third planetary gear set (P3) and the sun gear of the fourth planetary gear set (P4);
• and
• the third clutch (56, 67, 57) being engagable for blocking the second planetary gear (P2).