Active roll stabilizer for motor vehicles

The invention relates to an active anti-roll bar for motor vehicles, comprising a divided stabilizer with two stabilizer halves (2, 3) and a first and a second stabilizer end (2a, 3a), one between the stabilizer ends (2a, 3a) arranged actuator (6), comprising an electric motor (7) having planet gears (8) and a driven-side planetary carrier (17), wherein the electric motor (7) and the planetary transmission (8) in a common housing (9, 10) are arranged, wherein the first stabilizer end (2a) with the housing (9) and the second stabilizer end (3a) with the planet carrier (17) are connected and wherein the planet carrier (17) via a bearing (18) relative to the housing (10) is supported. It is proposed that the bearing as a double-row roller bearing (18) is formed with a first and a second roller bearing row which form a widened support base (a).