Actuation device for an electromechanically actuatable motor vehicle brake

An actuation device for an electromechanically actuatable motor vehicle brake for actuating at least one brake lining of the motor vehicle brake, comprising

• at least one drive element,
• a first power transmission train that comprises a rotation-translation gear mechanism by which a rotational movement of the at least one drive element can be converted into a translational movement,
• a second power transmission train that comprises a rotation-translation gear mechanism by which a rotational movement of the at least one drive element can be converted into a translational movement and
• at least one actuation element that comprises at least one clutch, wherein the clutch, in a first shift mode, allows power to be transmitted from the at least one drive element to the first and/or the second power transmission train
• wherein the actuation element is configured to actuate the at least one brake lining,
• wherein the at least one drive element selectively transmits drive power to the first power transmission train or to the first and the second power transmission train, and
• wherein the first and second power transmission trains are operatively connected to the at least one actuation element or can be brought into operative connection therewith;
• wherein the rotation-translation gear mechanism of the first power transmission train is not self-locking and
• wherein the rotation-translation gear mechanism of the second power transmission train is self-locking;
• wherein the at least one drive element is operatively connected to the first and second power transmission trains such that, when the at least one drive element rotates in a first rotational angle range, drive power is transmitted to the at least one actuation element via the first power transmission train and that, when the at least one drive element rotates in a second rotational angle range, drive power is transmitted to the at least one actuation element via the first and the second power transmission train, and
• wherein the second rotational angle range adjoins the first rotational angle range;
• wherein the clutch, in a second shift mode, allows power to be transmitted from the at least one drive element to a third power transmission train, wherein the third power transmission train is operatively connected to the at least one actuation element or can be brought into operative connection therewith.