Multispeed transmission

Abstract

A transmission having input and output shafts, gearsets (RS 1 -RS 4 ), shafts ( 1 - 8 ) and elements (A-E). Carriers of gearsets (RS 4 , RS 3 ) are respectively connected to the input and the output forming shafts ( 1, 2 ). Sun gears of gearsets (RS 1 , RS 4 ) are coupled forming shaft ( 3 ). The ring gear and a carrier respectively of gearsets (RS 1 , RS 2 ) form shafts ( 4, 8 ). Ring gears of gearsets (RS 2 , RS 4 ) respectively couple sun gears of gearsets (RS 3 , RS 2 ) forming shafts ( 5, 7 ). A carrier of gearset (RS 1 ) and a ring gear of gearset (RS 3 ) are connected forming shaft ( 6 ). In the power flow, elements (A, B) are respectively arranged between shafts ( 3, 4 ) and a transmission housing, element (C) between shafts ( 5, 1 ), element (D) between shafts ( 8, 2 ) or ( 8, 6 ), and element (E) between two of shafts ( 5, 7, 8 ).

1 - 49 . (canceled) 
     
     
         50 . A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:
 an input shaft (AN) and an output shaft (AB);   first, second, third and fourth planetary gear sets (RS 1 , RS 2 , RS 3 , RS 4 );   at least first, second, third, fourth, fifth, sixth, seventh and eighth rotatable shafts ( 1 ,  2 ,  3 ,  4 ,  5 ,  6 ,  7 ,  8 ) and first, second, third, fourth and fifth shifting elements (A, B, C, D, E) whose selective engagement defines different gear ratios between the input shaft (AN) and the output shaft (AB) such that eight forward gears and at least one reverse gear can be implemented; and when shifting from one forward gear into one of a successive higher and a successive lower forward gear causes a single one of the first, the second, the third, the fourth and the fifth shift elements to disengage and a single one of the first, the second, the third, the fourth and the fifth shift elements to engage.