wheels are supported on the toothing of a first ring gear 3 that is supported in the housing 2 in the illustrated embodiment the speed of the planetary carrier 6 of the first planet wheels 5 provides the input speed for the axially neighboring second transmission stage in this connection the planetary carrier 6 of the first planet wheels 5 is fixedly connected to a second sleeve 8 that is coaxially positioned relative to the drive sleeve 4 the sleeve 8 is provided on its circumference with a sun wheel toothing 9 and forms the sun wheel of the second planetary gear stage in the present embodiment the first planetary carrier 6 that is embodied essentially radially to the axis of rotation if the gearbox 1 and the sun wheel sleeve 8 of the second gear stage that is configured primarily axially form together a monolithic part on the sun wheel toothing 9 of the central sleeve 8 of the second gear stage the second planet wheels 10 are rolling and are supported on the second planetary carrier 12 the second planetary carrier 12 and the sun wheel sleeve 11 of the third planetary gear stage together form a monolithic part third planet wheels 15 mesh with the sun wheel sleeve 11 the third planet wheels 15 are supported on the.