Actuator and transmission

The invention relates to an actuating device, in particular for operating a transmission for selecting a gear ratio and for turning on or disengagement of the selected gear stage and / or for actuating at least one clutch, with at least one rotatable roller member having guide tracks in each of which a contact member of a shift fork engages for displacing the shift fork to select and input or designing a gear stage of a transmission and having an operating area for a clutch actuation means for actuating the at least one coupling.