Steering device, motor vehicle having such a steering device, and method for operating such a steering device

A steering device (3) which is configured as a steer-by-wire steering device, comprising:

• a steering shaft (7) disposed for rotation in a circumferential direction (5);
• a casing tube (9) at least partially encompassing the steering shaft (7) in the circumferential direction (5), wherein the steering shaft (7) is fixed in relation to the casing tube (9) in an axial direction (15) of the steering shaft (7);
• a sleeve (11) encompassing the steering shaft (7) in the circumferential direction (5);
• and
• a locking device (13);
• wherein the steering shaft (7) has an external thread (17) which meshes with an internal thread (19) of the sleeve (11);
• wherein the sleeve (11) is form-fitted into the casing tube (9) such that the sleeve (11) is displaceable in relation to the casing tube (9) in the axial direction (15) and is fixed in the circumferential direction (5);
• wherein a lateral surface (21) of the sleeve (11) has at least one recess (23);
• wherein the locking device (13) and the at least one recess (23) are disposed in relation to each other such that the locking device (13) is engageable into the at least one recess (23) in at least one axial position of the sleeve (11);
• wherein the locking device (13) has a bolt (25), wherein the bolt (25) engages into the at least one recess (23) in a locked state of the bolt (23), and wherein a rotation of the steering shaft (7) around the axial direction (15) of the steering shaft (7) is prevented in the locked state of the bolt (23).