The invention relates to a drive unit for rotationally and linearly moving a working element (3) with respect to a first housing element (1), wherein the drive unit comprises a first and a second motor (7, 8). In order to permit a simple design and a simple mounting and to reduce the required axial installation space and the costs, the drive unit has bearing means which, in the case of a linear movement of the working element (3) with respect to the first housing element (1), permit a primary part (7a) and a secondary part (7b) of the first motor (7) and/or of the second motor (8) to be arranged in an axially non-displaceable fashion.