one hand and a coupling pressure space 23 is formed between the locking piston 21 and the intermediate flange 12 on the other hand for the hydraulic separation from the coupling pressure space 23 and from the coupling spring space 22 the locking piston 21 has an inner sealing element 24 against the first stabilizer part 1 and an outer sealing element 25 against the cylindrical housing 10 a coupling compression spring 26 which is supported on the bearing flange 14 and loads the locking piston 21 in the direction of the force transmission part 17 is inserted into the coupling spring space 22 in the opposite direction the locking piston 21 is loaded by the force of a hydraulic pressure in the coupling pressure space 23 both toothed elements 18 19 of the force transmission part 17 and of the cylindrical housing 10 as well as the two locking elements 20 of the locking piston 21 are coordinated with one another such that they couple under the force of the coupling compression spring 26 and establish a clearance free connection between the first stabilizer part 1 and the cylindrical housing 10 and uncouple over a limited axial path under the load of the hydraulic pressure in the coupling pressure space 23 and thus release a limited torsion angle between the first stabilizer part 1 and the cylindrical housing 10 the hydraulic and control part 9 comprises essentially a hydraulic valve block 27 which is arranged within the cylindrical housing 11 in spatial vicinity of the mechanical part 8 and is interconnected.