An assembly comprising a connection for the rotor hub of a wind turbine of a wind power plant whose rotor rotation axis points approximately in the direction of the wind during operation, for the purpose of absorbing all the forces and torques occurring there, and comprising at least one rotor bearing or main bearing for diverting axial and radial forces and tilting moments into a load-bearing structure of the wind power plant, further comprising a device for extracting the rotational energy from the wind wheel in the form of a single-stage planetary gear mechanism, which is integrated with the rotor bearing or main bearing and whose planet gears are mounted on a planet gear carrier and simultaneously mesh with a sun gear and a ring gear, and comprising a generator which is or can be connected to the output side of the planetary gear mechanism and operates to convert the rotational energy into electrical energy, wherein the inner ring of the rotor bearing or main bearing - has at one end face a connection surface for connection to the rotor hub of the wind power plant, - has at its outer face one or more raceways for rolling elements (32, 33) that simultaneously roll along one or more raceways of the outer ring, and - is provided at its inner face with a fully circumferential set of teeth which forms the ring gear and from which the rotational energy is tapped, and with a planar plate, which - is arranged at the generator side of the rotor bearing or main bearing, that is at its end face facing the rotor hub, - is connected to the outer ring of the rotor bearing or main bearing, - serves as a planetary gear carrier for planetary gears of the planetary gear meshing with the toothing at the inner side of the inner ring of the rotor bearing or main bearing, - and which has a central recess, through which an end-side area of the sun gear can be extended or is at least accessible, and is connected to the rotor of the generator, - characterized in that the stator of the generator is arranged at or fixed to the plate, - wherein the generator has a disk-like shape and is formed as an axial field generator. - has at one end face a connection surface for connection to the rotor hub of the wind power plant, - has at its outer face one or more raceways for rolling elements (32, 33) that simultaneously roll along one or more raceways of the outer ring, and - is provided at its inner face with a fully circumferential set of teeth which forms the ring gear and from which the rotational energy is tapped, - is arranged at the generator side of the rotor bearing or main bearing, that is at its end face facing the rotor hub, - is connected to the outer ring of the rotor bearing or main bearing, - serves as a planetary gear carrier for planetary gears of the planetary gear meshing with the toothing at the inner side of the inner ring of the rotor bearing or main bearing, - and which has a central recess, through which an end-side area of the sun gear can be extended or is at least accessible, and is connected to the rotor of the generator, - characterized in that the stator of the generator is arranged at or fixed to the plate, - wherein the generator has a disk-like shape and is formed as an axial field generator.