Preventing rotation of a fixed ring of a swashplate

1. A rotorcraft, comprising:

a body;

a power train coupled to the body and comprising a power source and a drive shaft coupled to the power source;

a gearbox surrounding a portion of the drive shaft;

a hub;

a rotor blade coupled to the hub;

an anti-rotation sleeve coupled to the gearbox and featuring an outer recess portion;

a tilt sleeve positioned about the anti-rotation sleeve and having an opening therethrough, wherein the tilt sleeve is configured to slide in a strictly axial direction relative to the anti-rotation sleeve;

a first swashplate ring positioned about the tilt sleeve and featuring an inner recess portion;

an anti-rotation mechanism disposed through the opening and at least partially in the outer recess portion and the inner recess portion, the anti-rotation mechanism operable to prevent the first swashplate ring from rotating about the anti-rotation sleeve, the anti-rotation mechanism comprising:

a pin disposed through the opening and at least partially in the outer recess portion and the inner recess portion;

a key disposed at least partially in the outer recess portion and the opening and configured to receive the pin; and

a nut at least partially disposed in the outer recess portion and coupling the pin to the key; and

a second swashplate ring positioned about the first swashplate ring and rotatable about the anti-rotation sleeve with rotation of the plurality of rotor blades.

2. The rotorcraft of claim 1 , wherein:

the tilt sleeve comprises a curved surface; and

the first swashplate ring is pivotable along the curved surface.

3. The rotorcraft of claim 1 , wherein the key abuts the first swashplate ring.

4. The rotorcraft of claim 1 , wherein the outer recess portion is an elongated slot.

5. The rotorcraft of claim 1 , wherein the key abuts a surface of the anti-rotation sleeve that at least partially defines the outer recess portion.

6. The rotorcraft of claim 1 , wherein the anti-rotation sleeve is coupled to the gearbox such that the anti-rotation sleeve does not move relative to the gearbox.

7. A rotor system, comprising:

an anti-rotation sleeve featuring an outer recess portion;

a tilt sleeve positioned about the anti-rotation sleeve and having an opening therethrough, wherein the tilt sleeve is configured to slide in a strictly axial direction relative to the anti-rotation sleeve;

a first swashplate ring positioned about the tilt sleeve and featuring an inner recess portion;

an anti-rotation mechanism disposed through the opening and at least partially in the outer recess portion and the inner recess portion, the anti-rotation mechanism operable to prevent the first swashplate ring from rotating about the anti-rotation sleeve, the anti-rotation mechanism comprising:

a pin disposed through the opening and at least partially in the outer recess portion and the inner recess portion;

a key disposed at least partially in the outer recess portion and the opening and configured to receive the pin; and

a nut at least partially disposed in the outer recess portion and coupling the pin to the key; and

a second swashplate ring positioned about the first swashplate ring and rotatable about the anti-rotation sleeve.

8. The rotor system of claim 7 , further comprising a gearbox, wherein the anti-rotation sleeve is coupled to the gearbox.

9. The rotor system of claim 7 , wherein:

the tilt sleeve comprises a curved surface; and

the first swashplate ring is pivotable along the curved surface.

10. The rotor system of claim 7 , wherein the key abuts the first swashplate ring.

11. The rotor system of claim 7 , wherein the outer recess portion is an elongated slot.

12. The rotor system of claim 7 , wherein the key abuts a surface of the anti-rotation sleeve that at least partially defines the outer recess portion.

13. The rotor system of claim 7 , wherein the tilt sleeve is coupled to a gearbox such that the anti-rotation sleeve does not move relative to the gearbox.

14. A method of preventing rotation a fixed ring of a swashplate, comprising:

maintaining a tilt sleeve positioned about an anti-rotation sleeve, the anti-rotation sleeve featuring an outer recess portion, the tilt sleeve having an opening therethrough, the tilt sleeve being configured to slide in a strictly axial direction relative to the anti-rotation sleeve;

maintaining a first swashplate ring positioned about the tilt sleeve, the first swashplate ring featuring an inner recess portion;

providing an anti-rotation mechanism disposed through the opening and at least partially in the outer recess portion and the inner recess portion, the anti-rotation mechanism operable to prevent the first swashplate ring from rotating about the anti-rotation sleeve, the anti-rotation mechanism comprising:

a pin disposed through the opening and at least partially in the outer recess portion and the inner recess portion;

a key disposed at least partially in the outer recess portion and the opening and configured to receive the pin; and

a nut at least partially disposed in the outer recess portion and coupling the pin to the key;

maintaining a second swashplate ring rotatable about the first swashplate ring; and

preventing the first swashplate ring from rotating about the anti-rotation sleeve by maintaining an anti-rotation mechanism disposed through the opening and at least partially in the outer recess portion and the inner recess portion.

15. The method of claim 14 , further comprising rotating the second swashplate ring about the first swashplate ring.

16. The method of claim 14 , wherein the tilt sleeve comprises a curved surface, the method further comprising pivoting the first swashplate ring along the curved surface.