Device and method for detecting axial play

摘要

The axial play of a gearbox shaft (3) that meshes with a gearbox output (7) is determined by measuring the translational travel of the rotationally driven gearbox shaft (3) between the axial end stops (A1; A2) thereof while simultaneously blocking the gearbox output (7). The end stops define the axial play of the gearbox shaft (3). The commutator-dependent ripple of the motor current (IM) pertaining to the commutator motor which drives the gearbox shaft (3) in a drive unit (1; 2) is evaluated as the representative variable for the translational travel.