Drive train of a fluid flow power plant

1. A drive train of a continuous-flow power plant, comprising:

a rotor hub carrying at least one rotor blade; and

a gear mechanism having a plurality of planetary stages, the gear mechanism being configured to effect stepped-up transmission of a rotary movement of a rotor shaft connected to the rotor hub to a drive of a downstream generator,

wherein the rotor hub, the gear mechanism, and the generator are disposed coaxially with respect to one another,

wherein the gear mechanism is configured as a power-split gear mechanism having three planetary stages, and

wherein the rotor shaft is mounted via a main bearing in a surrounding support structure to which a gear mechanism casing configured to hold the gear mechanism is connected on both sides via torque brackets.

2. The drive train as claimed in claim 1 , wherein a shaft that connects an output of the gear mechanism and the drive of the generator is universal jointed both on the side of the gear mechanism and on the side of the generator.

3. A drive train of a continuous-flow power plant, comprising:

a rotor hub carrying at least one rotor blade; and

a gear mechanism having a plurality of planetary stages, the gear mechanism being configured to effect stepped-up transmission of a rotary movement of a rotor shaft connected to the rotor hub to a drive of a downstream generator,

wherein the rotor hub, the gear mechanism, and the generator are disposed coaxially with respect to one another,

wherein the gear mechanism is configured as a power-split gear mechanism having three planetary stages, and

wherein the rotor shaft is mounted via two main bearings, lying one behind the other in the axial direction, in a surrounding support structure to which a gear mechanism casing configured to hold the gear mechanism is connected on both sides via torque brackets.

4. The drive train as claimed in claim 3 , wherein a shaft that connects an output of the gear mechanism and the drive of the generator is universal jointed both on the side of the gear mechanism and on the side of the generator.

5. A drive train of a continuous-flow power plant, comprising:

a rotor hub carrying at least one rotor blade; and

a gear mechanism having a plurality of planetary stages, the gear mechanism being configured to effect stepped-up transmission of a rotary movement of a rotor shaft connected to the rotor hub to a drive of a downstream generator,

wherein the rotor hub, the gear mechanism, and the generator are disposed coaxially with respect to one another,

wherein the gear mechanism is configured as a power-split gear mechanism having three planetary stages, and

wherein, starting from a side of the generator that is remote from the gear mechanism, a tube runs coaxially through the generator and the gear mechanism to the rotor hub.

6. The drive train as claimed in claim 5 , wherein an output of the gear mechanism is electrically insulated from the drive of the generator.

7. The drive train as claimed in claim 5 , wherein a gear mechanism casing is insulated from a generator casing.

8. The drive train as claimed in claim 5 , wherein the continuous-flow power plant is configured as a wind power plant or a tidal power plant.

9. The drive train as claimed in claim 5 , wherein a shaft that connects an output of the gear mechanism and a rotor of the generator is supported via the rotor, with the rotor being bearing-mounted.

10. The drive train as claimed in claim 5 , wherein the rotor shaft is mounted via a main bearing in a surrounding support structure to which a gear mechanism casing configured to hold the gear mechanism is connected on both sides via torque brackets.

11. The drive train as claimed in claim 5 , wherein the rotor shaft is mounted via two main bearings, lying one behind the other in the axial direction, in a surrounding support structure to which a gear mechanism casing configured to hold the gear mechanism is connected on both sides via torque brackets.

12. The drive train as claimed in claim 5 , wherein:

the gear mechanism includes a drive coupled to the rotor shaft, the drive being connected to a planet carrier of a first planetary stage and a ring gear of a second planetary stage,

wherein a ring gear of the first planetary stage is fixed and a sun wheel of the first planetary stage is coupled to a first shaft, which as it continues is connected to a planet carrier of a third planetary stage,

wherein a planet carrier of the second planetary stage is fixed and a sun wheel of the second planetary stage is connected via a second shaft to a ring gear of the third planetary stage, and

wherein a sun wheel of the third planetary stage is connected to an output of the gear mechanism.

13. The drive train as claimed in claim 5 , wherein the rotor shaft, in the region of the rotor hub, is mounted on a shaft section via a large bearing.

14. The drive train as claimed in claim 5 , wherein the generator is placed in a gear mechanism casing configured to hold the gear mechanism.

15. The drive train as claimed in claim 5 , wherein the generator is held in a generator casing that is separate from a gear mechanism casing configured to hold the gear mechanism.

16. The drive train as claimed in claim 15 , wherein the generator casing is flanged to the gear mechanism casing.

17. The drive train as claimed in claim 5 , wherein the rotor shaft and a drive of the gear mechanism are connected to one another via a clutch.

18. The drive train as claimed in claim 5 , wherein a shaft that connects an output of the gear mechanism and the drive of the generator is universal jointed both on the side of the gear mechanism and on the side of the generator.

19. The drive train as claimed in claim 9 , wherein the shaft is supported via the rotor, with the rotor being bearing-mounted, on both sides.