A drive unit arranged for converting a rotational motion into a linear reciprocating motion in operation, comprising: a motor having a motor shaft arranged for providing a rotational motion of the motor shaft around a longitudinal axis of the motor shaft in operation; a motor shaft extension comprising at least a first eccentric shaft element that is arranged eccentrically with respect to the longitudinal axis of the motor shaft so that in operation the first eccentric shaft element moves on a circle around the longitudinal axis of the motor shaft, the circle extending in a plane being perpendicular to the longitudinal axis; at least one elastically deformable unit having a coupling element arranged for coupling with a driven element, preferably wherein the coupling element is coupled with or can be coupled with a drive shaft; wherein the first eccentric shaft element is coupled with the deformable unit to periodically deform the deformable unit so that a longitudinal position in the direction of the longitudinal axis of the motor shaft of the coupling element of the deformable unit periodically changes, preferably wherein the deformable unit is an integral, single unit; and wherein the deformable unit comprises a first arm section having a first end and a second end and a second arm section having a first end and a second end, wherein the second end of the first arm section and the first end of the second arm section are connected with each other, wherein the second end of the second arm section is arranged with a distance to the first end of the first arm section in the direction of the longitudinal axis of the motor shaft, preferably wherein the second end of the second arm section is connected with the coupling element; characterized in that the first end of the first arm section is connected with a mounting structure that is fixed relative to the motor and the second end of the first arm section and the first end of the second arm section are fixedly or rigidly connected and the first arm section and the second arm section are each at least partially resiliently deformable so that they store energy in a deformation process and release the energy again when a load causing the deformation is released. a motor having a motor shaft arranged for providing a rotational motion of the motor shaft around a longitudinal axis of the motor shaft in operation; a motor shaft extension comprising at least a first eccentric shaft element that is arranged eccentrically with respect to the longitudinal axis of the motor shaft so that in operation the first eccentric shaft element moves on a circle around the longitudinal axis of the motor shaft, the circle extending in a plane being perpendicular to the longitudinal axis; at least one elastically deformable unit having a coupling element arranged for coupling with a driven element, preferably wherein the coupling element is coupled with or can be coupled with a drive shaft; wherein the first eccentric shaft element is coupled with the deformable unit to periodically deform the deformable unit so that a longitudinal position in the direction of the longitudinal axis of the motor shaft of the coupling element of the deformable unit periodically changes, preferably wherein the deformable unit is an integral, single unit; and wherein the deformable unit comprises a first arm section having a first end and a second end and a second arm section having a first end and a second end, wherein the second end of the first arm section and the first end of the second arm section are connected with each other, wherein the second end of the second arm section is arranged with a distance to the first end of the first arm section in the direction of the longitudinal axis of the motor shaft, preferably wherein the second end of the second arm section is connected with the coupling element; characterized in that the first end of the first arm section is connected with a mounting structure that is fixed relative to the motor and the second end of the first arm section and the first end of the second arm section are fixedly or rigidly connected and the first arm section and the second arm section are each at least partially resiliently deformable so that they store energy in a deformation process and release the energy again when a load causing the deformation is released.