Multi-stage planetary gear mechanism for a wind turbine, comprising a special lubricant guide

1. A multi-stage planetary transmission for a wind turbine, comprising:

a transmission housing having an oil supply channel disposed therein;

an input-side first planetary stage disposed in the transmission housing;

at least one second planetary stage disposed downstream of and connected to the first planetary stage by a spline of a sun gear shaft of the first planetary stage;

a first oil conducting channel supplied by the oil supply channel and configured to supply oil to planetary gear bearings of the first planetary stage;

a second oil conducting channel supplied by the oil supply channel and disposed so as to pass through a planet carrier of the second planetary stage at least partially in an axial direction, the second oil conducting channel configured to supply oil to planetary gear bearings of the second planetary stage; and

a third oil conducting channel supplied by the oil supply channel and configured to supply oil to the spline,

wherein, in order to supply oil to the spline, the third oil conducting channel branches off, in a radial direction, from the second oil conducting channel, wherein the second conducting channel is longer than the third oil conducting channel, in order to open into the region of the spline.

2. The multi-stage planetary transmission according to claim 1 , wherein an end, externally toothed sun gear shaft of the first planetary stage is configured to engage with an internally toothed receiving bushing portion of the planet carrier of the second planetary stage by the spline .

3. The multi-stage planetary transmission according to claim 2 , wherein the second oil conducting channel branches off in the radial direction from the fixed oil supply channel and extends in the axial direction through the internally toothed receiving bushing portion of the planet carrier of the second planetary stage.

4. The multi-stage planetary transmission according to claim 3 , wherein, in the second planetary stage, the second oil conducting channel transitions into a radial channel portion for supplying oil to the planetary gear bearings of the second planetary stage.

5. The multi-stage planetary transmission according to claim 4 , wherein the radial channel portion of the second oil conducting channel is offset in the axial direction relative to the third oil conducting channel.

6. The multi-stage planetary transmission according to claim 4 , wherein the radial channel portion of the second oil conducting channel is in alignment with the third oil conducting channel.

7. The multi-stage planetary transmission according to claim 1 , wherein the first oil conducting channel branches off from the fixed oil supply channel in the axial direction and extends through a planet carrier of the first planetary stage in order to supply oil to the planetary gear bearings of the first planetary stage.

8. The multi-stage planetary transmission according to claim 1 , wherein a branching point of at least one of the first and second oil conducting channels from the fixed oil supply channel is formed by an oil distributor ring that acts as a component of a rotary transmission leadthrough and is arranged at an end of the fixed oil supply channel.

9. The multi-stage planetary transmission according to claim 8 , wherein the oil distributor ring has a substantially rectangular external cross section and an internal T-shaped channel cross section in order to form branching points of the first and second oil conducting channels in the axial and radial directions, respectively.

10. The multi-stage planetary transmission according to claim 1 , wherein the third oil conducting channel opens out in an annular chamber that extends around the distal end region of the sun gear shaft.