Torsion bar spring system for a wheel suspension of a motor vehicle

The torsion spring assembly has an actuator (28) arranged on a vehicle body (26) or on an auxiliary frame (14) for variable biasing of a torsion spring system. The actuator, particularly its motor-gear unit is mounted movably on the vehicle body in a bearing point (33) in the circumferential direction, and is supported resiliently on the vehicle body by a spring element in the direction of the torsional moments acting on a torsion bar spring (22).