A transmission (G) for an on-load tap-changer (S) which has a motor (M) with an output shaft (ABW) and has a diverter switch (LU) with a drive shaft (ANW), the transmission (G) comprising - a cam disk (KS), a drive gear wheel (ANZ) and a roller (R) which is coupled to the drive gear wheel, wherein - the cam disk (KS) is connectable in a rotationally fixed manner to the output shaft (ABW) and the output shaft lies on a rotation axis (RA1) of the cam disk (KS), - the drive gear wheel (ANZ) is connectable in a rotationally fixed manner to the drive shaft (ANW), characterized in that : - the cam disk (KS) has an inner contour (IK) and an outer contour (AK), which inner contour and outer contour can be followed by the roller (R), - the inner and the outer contour (IK; AK) each have a first region (IKB1, AKB1) with a constant radius of curvature and a second region (IKB2, AKB2) in which the distance of the respective contour from the rotation axis (RA) of the cam disk (KS) changes, and in that - the roller (R), in the event of a rotational movement of the cam disk (KS), follows the contours (IK; AK) in such a way that said roller follows a portion of the first region of the outer contour (AKB1), thereafter a portion of the second region of the outer contour (AKB2) and thereafter a portion of the first region of the inner contour (IKB1). - a cam disk (KS), a drive gear wheel (ANZ) and a roller (R) which is coupled to the drive gear wheel, - the cam disk (KS) is connectable in a rotationally fixed manner to the output shaft (ABW) and the output shaft lies on a rotation axis (RA1) of the cam disk (KS), - the drive gear wheel (ANZ) is connectable in a rotationally fixed manner to the drive shaft (ANW), characterized in that : - the cam disk (KS) has an inner contour (IK) and an outer contour (AK), which inner contour and outer contour can be followed by the roller (R), - the inner and the outer contour (IK; AK) each have a first region (IKB1, AKB1) with a constant radius of curvature and a second region (IKB2, AKB2) in which the distance of the respective contour from the rotation axis (RA) of the cam disk (KS) changes, and in that - the roller (R), in the event of a rotational movement of the cam disk (KS), follows the contours (IK; AK) in such a way that said roller follows a portion of the first region of the outer contour (AKB1), thereafter a portion of the second region of the outer contour (AKB2) and thereafter a portion of the first region of the inner contour (IKB1). - the cam disk (KS) has an inner contour (IK) and an outer contour (AK), which inner contour and outer contour can be followed by the roller (R), - the inner and the outer contour (IK; AK) each have a first region (IKB1, AKB1) with a constant radius of curvature and a second region (IKB2, AKB2) in which the distance of the respective contour from the rotation axis (RA) of the cam disk (KS) changes, and in that - the roller (R), in the event of a rotational movement of the cam disk (KS), follows the contours (IK; AK) in such a way that said roller follows a portion of the first region of the outer contour (AKB1), thereafter a portion of the second region of the outer contour (AKB2) and thereafter a portion of the first region of the inner contour (IKB1). <EOS>