Drive device

A drive device to provide relative movement between a stationary first component element and a second component element movable axially relative to the stationary first component element, comprising:

• a housing;
• a spindle drive, arranged in the housing and having a threaded spindle and a spindle nut arranged on the threaded spindle, configured to drive the first component element and the second component element so as to be axially movable relative to one another, the spindle drive being reversibly rotatably drivable around an axis of rotation extending coaxial to the threaded spindle by a rotatably drivable driveshaft;
• and
• a brake device arranged in the housing, the brake device being configured to prevent axially relative movement of the first component element and second component element relative to one another through axial application of force to the first component element and/or second component element,
• wherein the brake device comprises:
• a first rotationally symmetrical component element;
• a second rotationally symmetrical component element;
• a wrap spring brake having a switching spring (9, 9′, 9″) and a brake spring (10, 10′, 10″) each wound in an axial direction,
• wherein, when the driveshaft is not rotatably driven in rotation, the switching spring (9, 9′, 9″) is radially frictionally engaged at the first rotationally symmetrical component element and the brake spring (10, 10′, 10″) is radially frictionally engaged at the second rotationally symmetrical component element, and a rotational movement of the threaded spindle (3) is prevented, wherein the frictional engagement of the switching spring (9, 9′, 9″) with the first rotationally symmetrical component element can be canceled when the driveshaft is driven in a first rotational direction, and the frictional engagement of the brake spring (10, 10′, 10″) with the second rotationally symmetrical component element can be canceled when the driveshaft is driven in a second rotational direction,
• wherein the brake spring (10, 10′, 10″) engages the second rotationally symmetrical component element with a friction torque that is greater than the friction torque with which the switching spring (9, 9′, 9″) engages at the second rotationally symmetrical component element, and
• wherein the switching spring (9) and the brake spring (10) have different winding directions and are connected to one another by their respective ends, and the first rotationally symmetrical component part is a cylindrical part of the threaded spindle (3) or a first cylindrical element fixedly connected to the threaded spindle (3), wherein the cylindrical part of the threaded spindle (3) or the first cylindrical element is enclosed by the switching spring, and wherein the brake spring (10) engages, by its outer circumference, at a cylindrical inner wall of the housing (1) or of a second element fixedly connected to the housing (1).