Wind turbine rotor

1. A wind turbine rotor comprising a hub, a plurality of blades and at least one pitch system for rotating a blade substantially along its longitudinal axis,

wherein the pitch system comprises a bearing, a gear and a pitch drive, the pitch drive being arranged on a flange and having a motor and a pinion which meshes with the gear, wherein one of the hub and blade comprises the flange and the other of the hub and blade comprises the gear, and

wherein the flange is provided with a hole and an intermediate support is concentrically arranged with respect to the hole, wherein the intermediate support comprises an off-center opening with respect to a central axis of the hole and the pitch drive is mounted through the off-center opening, and wherein the position of the off-center opening is such that the intermediate support can be arranged in a first position in which the drive pinion meshes with a first section of the gear and in a second position in which the drive pinion meshes with a second section of the gear.

2. The wind turbine rotor of claim 1 , wherein the intermediate support is fixed to the flange by screws or bolts being arranged around a perimeter of the intermediate support.

3. The wind turbine rotor of claim 2 , wherein the screws or bolts fixing the intermediate support to the flange are arranged in predefined screw or bolt positions such that the intermediate support can be fixed only in the first and second positions in which the drive pinion meshes with the first and second gear sections.

4. The wind turbine rotor of claim 3 , wherein the predefined screw or bolts positions are the same for each of the first and second positions of the intermediate support.

5. The wind turbine rotor of claim 3 , wherein the predefined screw or bolts positions are different for each of the first and second positions of the intermediate support.

6. The wind turbine rotor of claim 1 , wherein the drive pinion is mounted on a reductor gearing of the pitch system, the reductor gearing being fixed to the intermediate support by screws or bolts.

7. The wind turbine rotor of claim 1 , wherein the intermediate support is a plate.

8. The wind turbine rotor of claim 7 , wherein the hole of the flange is a round hole and the intermediate support is a disc.

9. The wind turbine rotor of claim 1 , wherein the gear is provided on a ring of the bearing.

10. The wind turbine rotor of claim 9 , wherein the gear extends along substantially the whole inner or outer circumference of an inner or outer bearing ring.

11. The wind turbine rotor of claim 9 , wherein the gear extends along only a portion of an inner or outer circumference of an inner or outer bearing ring.

12. The wind turbine rotor of claim 1 , wherein the gear is made from a plurality of annular segments.

13. The wind turbine comprising a wind turbine rotor according to claim 1 .

14. The wind turbine of claim 13 , wherein the intermediate support is fixed to the flange by screws or bolts being arranged around a perimeter of the intermediate support.

15. The wind turbine of claim 14 , wherein the screws or bolts fixing the intermediate support to the flange are arranged in predefined screw or bolt positions such that the intermediate support can be fixed only in the first and second positions in which the drive pinion meshes with the first and second gear sections.

16. The wind turbine of claim 15 , wherein the predefined screw or bolt positions are the same for each of the first and second positions of the intermediate support.

17. The wind turbine of claim 15 , wherein the predefined screw or bolt positions are different for each of the first and second positions of the intermediate support.

18. The wind turbine of claim 13 , wherein the intermediate support is a plate.

19. The wind turbine of claim 18 , wherein the hole of the flange is a round hole and the intermediate support is a disc.