Multistage gearbox for motor vehicles

The invention relates to a multistage gearbox for motor vehicles, having a plurality of forward gears and at least one reverse gear, consisting of a plurality of 3-shaft gearboxes and a plurality of shifting elements, with a driveshaft (W1), an output shaft (W2) and a plurality of gearbox shafts, differential shifts and sum shafts, wherein: a first differential shaft (d1.1) of a first 3-shaft gearbox (RS1) is connected for conjoint rotation to a first differential shaft (d1.2) of a second 3-shaft gearbox (RS2); the driveshaft (W1) and a sum shaft (s2) of the second 3-shaft gearbox (RS2) are connected for conjoint rotation; a fourth gearbox shaft (W6; W76) and a second differential shaft (d2.2) of the second 3-shaft gearbox (RS2) are connected for conjoint rotation; the fourth gearbox shaft (W6; W76) or a fifth gearbox shaft (W7) is connected for conjoint rotation to a first differential shaft (d1.3) of a third 3-shaft gearbox (RS3); and a third gearbox shaft (W5) and a second differential shaft (d2.1) of the first 3-shaft gearbox (RS1) are connected for conjoint rotation. A high functionality can be achieved by connecting a sum shaft (s1) of a first 3-shaft gearbox (RS1) for conjoint rotation to a sum shaft (s3) of the third 3-shaft gearbox (RS3), and by connecting the output shaft (W2) and a second differential shaft (d2.3) of the third 3-shaft gearbox (RS3) for conjoint rotation.