| 摘要 |
The invention relates to a rotor shaft for a wind turbine. The rotor shaft comprises a flange for accommodating a rotational movement from a hub of a rotor of the wind turbine, an output for deriving a rotational movement, for example in a gear, a shank and an intermediate section. The flange is connected to the shank via the intermediate section, and the shank is in turn connected to the output. Such a rotor shaft is substantially hollow in design. A bearing surface for supporting the shank on a main bearing of the wind turbine is located on the outer surface of the shank. The bearing surface is distanced at an effective bearing distance from a flange surface of the flange in an axial direction and is arranged on an area of the shank adjacent to the intermediate section. A problem addressed by the invention is that of providing a rotor shaft which can be produced cost-effectively and, in spite of this, meets the high requirements of the wind energy sector in respect of quality and homogeneity of the material. The problem is solved by the rotor shaft being substantially made of a metallic cast material and having an inner surface facing inwards at its end faces in a radial direction and an outer surface facing outwards. The outer surface of the intermediate section is curved in a concave manner in a section plane spanned by the radial direction and axial direction, particularly with at least one outer radius, and the inner surface of the intermediate section is designed so as to be curved in a convex manner in the section plane, particularly with at least one inner radius. The outer surface and inner surface of the intermediate section are thus substantially continuous. The intermediate section or the radii of the intermediate section are designed geometrically such that a maximum stress at each point of the rotor shaft is always below the yield point defined for the cast material (Rp, 0.2). The maximum stress in the component is calculated using a load profile specified for the rotor shaft. |
