Rotor bearing for a wind turbine

A rotor bearing for a wind energy installation, comprising:

• a machine housing, which is mounted on a machine tower such that the machine housing can rotate;
• a generator for electricity production arranged in the housing;
• a wind-driven rotor with a rotor hub to which at least two rotor blades are fitted;
• and
• a large roller bearing, which supports the rotor and which has a first bearing ring, which is attached in a rotationally fixed manner to the machine housing and is arranged coaxially with respect to the rotor hub, a second hearing ring, which is held on the first bearing ring such that the second bearing ring can rotate and is attached to the rotor hub, and a multiplicity of roller bodies which roll between the first bearing rings ring and the second bearing ring, and the bearing is being connected to a downstream epicyclic gearbox, which is connected to the generator and comprises a hollow wheel with a circumferential internal tooth system, a plurality of planet wheels mounted on planet supports, and a central sun wheel,
• wherein the radially inner of the two bearing rings of the large roller bearing at the same time forms the hollow wheel of the epicyclic gearbox which is connected to the generator, in that its inner face is formed with the circumferential internal tooth system of the hollow wheel.