Multi-ratio transmission

An automatic multi-stage transmission of a planetary design for a motor vehicle, the multi-stage 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 within a housing (G), and each of the first planetary gearset (P1), the second planetary gearset (P2), the third planetary gearset (P3) and the fourth planetary gearset (P4) comprises a sun gear, a ring gear and a carrier;
• third, fourth, fifth, sixth, seventh and eighth rotating shafts (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 first, the second and the third brakes and the first, the second and the third clutches 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 can be implemented;
• the sun gear of the first planetary gearset (P1) being connected to the fifth shaft (5), the fifth shaft (5) being connected to the sun gear of the third planetary gearset (P3) and being connectable to the housing (G) by the third brake (05);
• the drive input shaft (1) being detachably connectable, by the first clutch (14), to the fourth shaft (4), the fourth shaft (4) being connected to the carrier of the third planetary gearset (P3) and to the sun gear of the second planetary gearset (P2), and the fourth shaft (4) being connectable to the housing (G) by the second brake (04);
• the drive input shaft (1) being detachably connectable, by the second clutch (17), to the seventh shaft (7), the seventh shaft (7) being connected to the ring gear of the third planetary gearset (P3), and the drive input shaft (1) being detachably connectable, by the third clutch (18), to the eighth shaft (8) being connected to the ring gear of the fourth planetary gearset (P4) and the carrier of the second planetary gearset (P2);
• the sixth shaft (6) being connected to the ring gear of the second planetary gearset (P2) and the carrier of the fourth planetary gearset (P4), and the third shaft (3) being connected to the sun gear of the fourth planetary gearset (P4) and being connectable, by the first brake (03), to the housing (G);
• and
• the drive output shaft (2) being connected to the carrier of the fourth planetary gearset (P4) and to the ring gear of the first planetary gearset (P1).