Wind power plant gear mechanism

1. A wind power plant planetary gear system with an axle and a gearwheel, at least one plain bearing bush being arranged between the axle and the gearwheel,

wherein the gearwheel comprises a bearing receiving portion having a conical shape,

wherein the at least one plain bearing bush has a conical shape and is connected to the bearing receiving portion of the gearwheel by a conical press fit,

wherein the at least one plain bearing bush is permanently fixed in position,

wherein the at least one plain bearing bush has a first end surface and a second end surface which lies opposite the former along a longitudinal center axis through the at least one plain bearing bush,

wherein the first end surface has a diameter d and the second end surface has a diameter D, the diameter D being greater than the diameter d,

wherein the gearwheel comprises a radial projection comprising a bearing surface, the bearing surface bearing against the second end surface,

wherein the radial projection is formed in one piece with the gearwheel, and

wherein the at least one plain bearing bush comprises a sliding layer in a region of the axle.

2. The wind power plant planetary gear system as claimed in claim 1 , wherein a ratio of D/d is a maximum of 1.2.

3. The wind power plant planetary gear system as claimed in claim 2 , wherein the ratio D/d is selected from a range of 1.0001 to 1.02.

4. The wind power plant planetary gear system as claimed in claim 1 , wherein two plain bearing bushes are arranged between the gearwheel and the axle for supporting the gearwheel,

wherein the two plain bearing bushes are arranged such that the two second end surfaces with the larger diameter D point towards one another.

5. The wind power plant planetary gear system as claimed in claim 4 , wherein the radial projection is formed by an annular web.

6. The wind power plant planetary gear system as claimed in claim 5 , wherein the annular web is designed to be spaced apart from the axle forming an intermediate space.

7. The wind power plant planetary gear system as claimed in claim 6 , wherein a connecting line opens into the intermediate space which connects the intermediate space to the surrounding atmosphere.

8. The wind power plant planetary gear system as claimed in claim 1 , wherein the at least one plain bearing bush is configured as a multi-layered plain bearing.

9. The wind power plant planetary gear system as claimed in claim 1 , wherein the sliding layer has a uniform layer thickness in an axial direction over a length of the plain bearing bush.

10. The wind power plant planetary gear system as claimed in claim 1 , wherein the sliding layer is formed up to an area of at least one of the second end surface and the first end surface.

11. The wind power plant planetary gear system as claimed in claim 1 , wherein the at least one plain bearing bush is additionally connected to the gearwheel in a form-fitting manner.

12. The wind power plant planetary gear system as claimed in claim 1 , wherein a surface of the at least one plain bearing bush bearing against the gearwheel has a roughened surface.

13. A wind power plant comprising the wind power plant planetary gear system, wherein the wind power plant planetary gear system is designed according to claim 1 .

14. The wind power plant planetary gear system as claimed in claim 1 , wherein the gearwheel is made in one piece.