Multi-ratio transmission

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

• a drive input shaft (1) and a drive output shaft (2);
• first, second, third, and fourth planetary gearsets (P1, P2, P3, P4) being arranged in a housing (G), and the first, the second, the third and the fourth planetary gearsets each comprising a sun gear, a ring gear and a carrier;
• third, fourth, fifth, sixth, seventh and eighth rotating shafts (1, 2, 3, 4, 5, 6, 7, 8)
• six shifting elements (03, 04, 05,14, 17, 18) comprising first, second and third brakes (03, 04, 05) and first, second and third clutches (14, 17, 18), and selective engagement of the six shifting elements producing various transmission ratios between the drive input shaft (1) and the drive output shaft (2) such that nine forward gears and one reverse gear are implementable;
• the drive input shaft (1) being connectable, via the first clutch (14), to the fourth shaft (4), the drive input shaft (1) being connectable, via the second clutch (17), to the seventh shaft (7) and the drive input shaft (1) being connectable, via the third clutch (18), to the eighth shaft (8);
• the drive output shaft (2) being continuously connected to the carrier of the third planetary gearset (P3);
• the third shaft (3) being continuously connected to both the sun gear of the third planetary gearset (P3) and the sun gear of the fourth planetary gearset (P4) 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 first planetary gearset (P1) and the carrier of the second planetary gearset (P2) 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 sun gear of the first planetary gearset (P1), and the fifth shaft (5) being connectable, via the third brake (05), to the housing (G),
• the sixth shaft (6) being continuously connected to both the ring gear of the second planetary gearset (P2) and the ring gear of the fourth planetary gearset (P4);
• the seventh shaft (7) being continuously connected to both the ring gear of the first planetary gearset (P1) and the sun gear of the second planetary gearset (P2);
• and
• the eighth shaft (8) being continuously connected to the carrier of the fourth planetary gearset (P4) and the ring gear of the third planetary gearset (P3).

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

• drive input, drive output, third, fourth, fifth, sixth, seventh, and eighth rotating shafts (1, 2, 3, 4, 5, 6, 7, 8, 0);
• first, second, third and fourth planetary gearsets (P1, P2, P3, P4) being arranged in a housing (G) of the transmission, and each of the first, the second, the third and the fourth planetary gearsets comprising a sun gear, a ring gear and a carrier;
• six shifting elements (03, 04, 05,14, 17, 18, 57) comprising first and second brakes (03, 04), first, second and third clutches (14, 17, 18), and a sixth shifting element (05, 57) comprising one of a third brake (05) and a fourth clutch (57);
• selective engagement of the six shifting elements producing various gear ratios between the drive input shaft (1) and the drive output shaft (2) such that nine forward gear ratios and one reverse gear ratio are implementable;
• the drive input shaft (1) being detachably connected by the first clutch (14) to the fourth shaft (4), the drive input shaft (1) also being detachably connected by the second clutch (17) to the seventh shaft (7), and the drive input shaft (1) also being detachably connected by the third clutch (18) to the eighth shaft (8);
• the drive output shaft (2) being connected to the carrier of the third planetary gearset (P3);
• the third shaft (3) being connected to both the sun gear of the third planetary gearset (P3) and the sun gear of the fourth planetary gearset (P4), and the third shaft (3) being detachably connected by the first brake (03) to the housing (G);
• the fourth shaft (4) being connected to both the carrier of the first planetary gearset (P1) and the carrier of the second planetary gearset (P2), and the fourth shaft (4) being couplable by the second brake (04) to the housing (G);
• the fifth shaft (5, 0) being connected to the sun gear of the first planetary gearset (P1), and the fifth shaft (5, 0) being one of directly connected to the housing (G), or couplable to the housing (G) by the third brake (05);
• the sixth shaft (6) being connected to both the ring gear of the second planetary gearset (P2) and the ring gear of the fourth planetary gearset (P4);
• the seventh shaft (7) being connected to the sun gear of the second planetary gearset (P2), and the seventh shaft (7) being one of directly connected to the ring gear of the first planetary gearset (P1), or couplable to the ring gear of the first planetary gearset (P1) by the fourth clutch (57);
• and
• the eighth shaft (8) being connected to the ring gear of the third planetary gearset (P3) and to the carrier of the fourth planetary gearset (P4).