Abstract: The invention relates to an actuator device comprising at least one output element, which can be applied with a fluid and can thereby be moved into at least one retaining position. An actuator is provided which can be operated in a pumping operation by controlling the actuator, in which at least one part of the actuator can be alternatingly moved in a first direction and in a second direction opposite the first direction via the controlling of the actuator, whereby the fluid can be conveyed to the output element in order to apply the output element with the fluid. A discharge channel is also provided, via which the fluid can be discharged from the output element.

Abstract: The invention relates to an actuator device comprising at least one solid-state actuator and a hydraulic unit connected mechanically to the solid-state actuator in series, wherein said hydraulic unit comprises a hydraulic volume which is filled with a hydraulic fluid. In the method of clamping a clamping body, an actuator device of this type is used and the solid-state actuator of the actuator device is controlled, in particular, depending on a movement variable of the clamping body.