Transmission unit, particularly multi-range transmission

A transmission unit, in particular a multi-range transmission, comprising one input and one output and a continuously variable transmission part arranged between said input and output and a mechanical transmission part, comprising two three-shaft planetary gear sets which each comprise a first, second and third shaft, wherein the first shafts of both planetary gear sets can be connected to the input and the further shafts of the respective planetary gear set are at least indirectly non-rotatably connected to the continuously variable transmission part and can be connected to the output, characterized in that the planetary gear sets can be connected via two shiftable coupling units, which can be selectively and alternately actuated, to form a four-shaft planetary gear set and the first coupling unit is arranged between the first shaft of the second planetary gear set and the input and the second coupling unit is arranged between the output and one shaft each of the first and second planetary gear sets, wherein the second shaft of the second planetary gear set and the third shaft of the first planetary gear set are non-rotatably connected to each other, wherein the second shaft of the second planetary gear set and the third shaft of the first planetary gear set are each formed by the ring gears of the respective planetary gear sets.