System of missile control surfaces and method of assembling the system

1. A system of missile control surfaces, comprising:

a control surface housing;

a control surface shaft being rotatably mounted in said control surface housing;

a control surface secured on said control surface shaft;

a control surface drive that is a translational drive, said control surface drive including two piston units engaged with one another and moveable relative to one another; and

a coupling unit coupling said control surface drive to said control surface shaft such that a movement of said control surface drive produces a rotation of said control surface shaft, said coupling unit including two flexible tension elements, each flexible tension element of said two flexible tension elements being secured on a respective one of said two piston units of said control surface drive and rolled up at least partially onto said control surface shaft, wherein the flexible tension element secured to one of said two piston units passes through a slot of the flexible tension element secured to the other one of said two piston units.

2. The system of missile control surfaces according to claim 1 , wherein said coupling unit has a bracing element, by means of said bracing element said two piston units can be pushed apart and thus braced relative to one another.

3. The system of missile control surfaces according to claim 1 , wherein said control surface drive is a translational drive having a piston unit and a piston housing, and said flexible tension element together with said piston unit extends into said piston housing.

4. The system of missile control surfaces according to claim 1 , wherein said control surface drive is a translational drive having a piston unit, and said flexible tension element is secured on said piston unit.

5. The system of missile control surfaces according to claim 4 , wherein said flexible tension element is embodied integrally with said piston unit.

6. The system of missile control surfaces according to claim 1 , wherein said flexible tension element is secured on an element of said control surface drive and is thicker radially in relation to said control surface shaft in a region in which it is secured than in a winding region of said flexible tension element.

7. The system of missile control surfaces according to claim 6 , wherein said flexible tension element is secured on said element of said control surface drive, and said winding region of said flexible tension element is separated from said element of said control surface drive by a gap, and, in a region of said gap, said flexible tension element thickens radially in relation to said control surface shaft towards an end of said gap.

8. The system of missile control surfaces according to claim 1 , further comprising:

an inner radial bearing; and

an outer radial bearing, said control surface shaft is held on said control surface housing by said outer radial bearing and is held on an engine housing by means of said inner radial bearing.

9. The system of missile control surfaces according to claim 8 , wherein said inner radial bearing is disposed at an axial level of said flexible tension element.

10. The system of missile control surfaces according to claim 8 , further comprising a holding unit, said control surface shaft is mounted on said holding unit on its side facing away from said control surface and is held axially by positive engagement on said holding unit, wherein said control surface shaft and said holding unit form an axial sliding bearing.

11. The system of missile control surfaces according to claim 10 , wherein said control surface shaft is held radially on said holding unit by means of said inner radial bearing.

12. A method for assembling a system of missile control surfaces according to claim 1 , the method comprising the steps of:

securing the control surface drive on the control surface housing;

inserting the control surface shaft into the control surface housing from an outside;

securing the two flexible tension elements of the coupling unit on the control surface shaft, with one of the two flexible tension elements passing through the slot of the other flexible tension element; and

rolling up the two flexible tension elements at least partially on the control surface shaft by rotating the control surface shaft.

13. The method according to claim 12 , which further comprises securing the control surface shaft axially by positive engagement on an inner axial bearing by rotation.