1. An actuating system for at least first and second shifting elements (K1, K2) of a
transmission being arranged coaxially with one another, the actuating system comprising:
at least first and second control devices for respectively actuating the first and second shifting elements,
the first and second control devices each comprising at least one rotary drive (4, 5) and at least one control element (6, 7), being coupled together by corresponding gearteeth, whereby rotational movement of each rotary drive (4, 5) being converted into axial control movement of the associated control element (6, 7) and the control elements (6, 7) being arranged coaxially with one another,
characterized in that an axial position of teeth of a gearteeth set on each control element (6, 7) varies atleast in regions in the circumferential direction.
2. The actuating system according to Claim 1, wherein the gearteeth set of each of the at least one control element (6, 7) is a gearwheel segment (12,13).
3. The actuating system according to Claim 2, wherein the gearwheel segments (12,13) each have an essentially helical shape.
4. The actuating system according to Claims 2 or 3, wherein the gearwheel segments (12, 13) are arranged on the respective control elements (6, 7) and extend radially outward.
5. The actuating system according to any of Claims 2 to 4, wherein an axial width of the gearwheel segments (12, 13) varies in a circumferential direction.
6. The actuating system according to any of Claims 2 to 5, wherein the gearwheel segments (12, 13) are one of spur gears, worm gears and angle drives.
7. The actuating system according to any of the preceding Claims, wherein each of the atleast one control element (6, 7) of the first and second control devices is mounted to rotate on a component fixed to the housing.
8. The actuating system according to any Claims 1 to 6, wherein the control elements (6, 7) of the first and second control devices are mounted so as to rotate on one another.
9. The actuating system according to Claims 7 or 8, wherein the component fixed to the housing is a roller spindle (8), which is in active connection with a radially outer spindle

nut (9) forming the control element (6) of the first control device, and with a radially inner spindle nut (10) forming the control element (7) of the second control device.
10. The actuating system according to Claims 7 or 8, wherein the component fixed to the housing is a roller ramp element (22), which is in active connection with a radially outer rotary roller ramp element (23) which forms the control element (6) of the first control device, and with a radially inner rotary roller ramp element (24) which forms the control element (7) of the second control device.
11. The actuating system according to Claims 9 and 10, wherein a pitch of the roller spindle (8) or the roller ramp element (22), fixed to the housing, corresponds approximately to that of the associated helical gearwheel segments (12,13).
12. The actuating system according to any of the preceding claims, wherein the component fixed to the housing comprises a housing flange element (25) extending radially outward as a housing support.
13. The actuating system according to any of the preceding claims, wherein the control elements (6, 7) of the first and the second control devices are mounted by sliding elements.
14. The actuating system according to any of the preceding claims, wherein the control elements (6, 7) act on the respective associated shifting elements via atleast one of pressure and tension.
15. The actuating system according to any of the preceding claims, wherein the rotation axes of the rotary drives (4, 5) are one of parallel and skewed relative to the axis of the first and the second control devices.
16. The actuating system according to any of the preceding claims, wherein the control devices are coupled to at least one transmission brake.
17. The actuating system according to any of the preceding claims, wherein at least one force compensation element engages with the first and the second control elements (6, 7).
18. The actuating system according to any of the preceding claims, wherein the shifting elements are one of oil-cooled clutches and dry-operating dual clutches.

19. The actuating system according to any of the preceding claims, wherein the shifting elements are one of oil-cooled brakes and dry-operating brakes.