Switching device for a motor vehicle transmission and method for controlling a motor vehicle transmission

Switching device for a motor vehicle transmission, in particular a fully automatic step transmission (10), with a coupling member (30), a plurality of gear shafts (24), each to a transmission axis (A) rotatably, a Reibschlussring (32) which has a friction cone (34) and rotatably and substantially axially displaceably to a transmission shaft (24) is connected, a form-locking ring (36) having a conical surface (38) and rotationally fixed substantially, and is connected axially displaceably to the coupling member (30), and an actuating body (40) having a conical surface (42) and rotatably and substantially axially displaceably to the coupling member (30) is connected, wherein the friction cone (34) of Reibschlussrings (32) between the conical surface (38) of the mold closing ring (36) and the conical surface (42) of the actuating body (40), wherein the gear shaft (24) and the coupling member (30) into an axial starting position of the actuating body (40) decoupled in rotation direction, in an axial Reibschlussstellung of the actuating body (40) frictionally coupled in rotation and in an axial form-fit position of the actuating body (40) in the rotational direction are positively coupled, wherein the form-fit ring (36) is connected in a positively locking position in a form-locking and a release position not form-fitting manner with the transmission shaft (24), and wherein the form-fit ring (36) is acted upon axially between the mold closing position and the release position, and movable into the release position.