Elastic rotary bearing for two-blade rotors of wind turbines

A rotary bearing for load cycles as an integral constituent part of a rotor hub, comprising a first, inner component in the shape of a carrier plate, which is firmly connected to a rotor shaft and thus to a rotating structure of the wind turbine, and a second, movable outer component, which has connection regions for two opposing rotor blades, the first inner component and the second, movable outer component being connected to one another via a first and second rotational joint unit in such a way that under the action of force the two rotor blades connected to the rotor hub can be reversibly moved toward or away from the rotor shaft,

• wherein
• (i) each of said first and said second rotational joint units is composed of:
• (a) at least one conical bushing, wherein each conical bushing comprises a plurality of elastic layers for absorbing forces acting predominantly radially with respect to a cone axis of the rotor shaft and has a taper angle, and
• (b) at least one elastic layer spring, which is a flat sandwich element that forms a structural unit with the at least one conical bushing of the respective rotational joint unit, or is formed by at least one such that it has a common axis with the at least one conical bushing and absorbs axially acting forces of the rotor shaft that are not absorbed by the respective at least one conical bushing,
• (ii) said first and said second rotational joint unit are arranged opposite one another and are firmly connected to one another via the first, inner component,
• (iii) the first inner component and the at least one conical bushing and the at least one elastic layer spring of each rotational joint unit are connected via pins or bolts which are attached as an extension of said first inner component,
• (iv) the first inner component, is firmly connected on two opposite sides thereof to an innermost layer of the plurality of elastic layers of the at least one conical bushing of each rotational joint unit, an axis of each conical bushing being perpendicular to the cone axis of the rotor shaft, and
• (v) the second, movable outer component is firmly connected to an outermost layer of the plurality of elastic layers of the at least one axially acting hemispherical element, wherein each elastic layer spring is arranged conical bushing of each rotational joint unit, so that under the action of force a reversible torsional deformation of the individual elastic layers of the conical bushings and/or a torsional deformation of the layer springs takes place.