Patent ID: 6860831

Claim:
A multi-stage reduction gear comprising: an input shaft ( 1 ); an output shaft ( 2 ); an upstream gear comprising a double, non-engageable planetary gear ( 3 ); a downstream gear comprising two simple, engageable planetary, gears ( 4 , 5 ); and six shift elements (A to F) comprising first, second, third and fourth clutches (A, F, B, E) and first and second brakes (C, D) which together with the two planetary gears ( 4 , 5 ) and shafts ( 6 to 9 ) pertaining thereto, form two output paths (P, Q); wherein the input shaft ( 1 ) is connected with the third clutch and the fourth clutch (B, E) as well as a sun wheel ( 10 ), a first fixed link ( 14 ) supports inner planet wheels ( 11 ) which engage with the sun wheel ( 10 ) and outer planet wheels ( 12 ), a second fixed link ( 15 ) supports the outer planet wheels ( 12 ) which engage with the inner planet wheels ( 11 ) and a first ring gear ( 13 ), the first ring gear ( 13 ) has a fixed connection with the first and the second clutch (A, F), the first and second fixed links ( 14 , 15 ) are coupled with each other and have a fixed connection with the first brake (C), as well as a housing, a first output path leads via the upstream planetary gear ( 3 ) and the first clutch (A) on a first shaft ( 6 ) and via the second clutch (F) on a second shaft ( 7 ), the second output path (Q) leads via the third clutch (B) on the second shaft ( 7 ) and via the fourth clutch (E) on a third shaft ( 8 ), the first shaft ( 6 ) is connectable with a second ring gear ( 18 ) by the first clutch (A), a third fixed link ( 19 ) support second planet wheels ( 17 ) which engage with a second sun wheel ( 16 ) and the ring gear ( 18 ), the ring gear ( 18 ) is coupled with a fourth fixed link ( 23 ) and forms the third shaft ( 8 ), the third shaft ( 8 ) is connectable with the fourth clutch (E) and can be locked by the second brake (D), the fourth fixed link ( 23 ) supports third planet wheels ( 21 ) which engage with a third sun wheel ( 20 ) and a third ring gear ( 22 ), the third sun wheel ( 20 ) forms the second shaft ( 7 ) which is lockable by the first brake (C), which is connectable with the first output path (P) by the second clutch (F) and with the second output path (Q) by the third clutch (B), the second output path is connectable with the second shaft ( 7 ), the fixed link ( 19 ) is coupled with the third ring gear ( 22 ) and forms the fourth shaft ( 9 ), which has a fixed connection with the output shaft ( 2 ).