Patent ID: 7108628

Claim:
A multistage transmission with an input drive shaft ( 3 ), which is connected to a primary planetary gear set ( 10 ), with an output drive shaft ( 4 ), which is connected with a principal planetary ger set ( 20 ), with a plurality of shifting elements (A to F), by means of which, selective closure of at least six forward stages can be shifted to and a transmission input speed of rotation (n ein ) of the input drive shaft ( 3 ), which is so transferable to the output drive shaft ( 4 ), that for shifting from one stage into a next higher successive stage or a next lower successive stage from an existing activated shifting element, respectively, only one shifting element is opened and another shifting element is closed, whereby the principal planetary gear set ( 20 ) possesses three non-coupled input elements, one output element of the primary planetary gear set ( 10 ) by means of a first shifting element (A) can be connected with a first input element of the principal planetary gear set ( 20 ) and by means of which a second shifting element (B) can be connected with a second input element of the principal planetary gear set ( 20 ), further, the input drive shaft ( 3 ) can be connected by means of a fifth shifting element (E) with a third input element of the principal planetary gear set ( 20 ) and an element of the primary planetary gear set ( 10 ) by means of a sixth shifting element (F) fixed in position, whereby the sixth shifting element (F) is secured on a side of the primary planetary gear set ( 10 ) which is remote from the principal planetary gear set ( 20 ) wherein the primary planetary gear set ( 10 ) serves as a plus-transmission with inner and outer planet gears ( 12 , 13 ), spiders ( 15 , 16 ) of which are bound together.