A wind turbine rotor blade assembly which incorporates automatic-aerodynamic control of the blade pitch angle is disclosed. The airfoil of the rotor blade (110) is free to rotate about a strategically located longitudinal blade axis which forms the spar stub (115) and is connected to the hub (120) of a horizontal axis wind turbine. The location of this blade axis is precisely set with respect to the turbine blade's aerodynamic center and center of mass. By further incorporating a reflexed airfoil with positive pitching moment this arrangement aerodynamically induces an automatic and self-regulating alignment of the rotor blade pitch such that the airfoil is always operating at or near optimal angle of attack. Details are disclosed on these strategic relationships which enable the successful operation of the new blade design.

A root assembly of a wind turbine blade for a wind turbine is provided. Also provided is a wind turbine blade including the root assembly and a wind turbine including the wind turbine blade.

Devices, systems, and methods of manufacturing wind turbine root attachment are provided. In various embodiments, an assembly for wind turbine root attachments includes a bushing, a core, and a filler. The bushing includes a body having cutouts extending from the proximal end to the distal end on either side of the bushing and a core cutout at the distal end. The bushing further includes an ear disposed at the proximal end of the bushing and within the first cutout. The core includes two wedges where the thick end of each wedge abut one another. The thin end of the proximal wedge is disposed within the core cutout and the core includes cutouts extending from the proximal end to the distal end on either side of the core. The filler is disposed within the cutout on the side of the assembly having the ear.

The present invention discloses a blade root assembly for a wind turbine, the assembly comprising a blade with a root portion and a blade root flange. The blade root portion comprising a plurality of receptacles configured to receive fasteners to couple the blade root portion with a wind turbine rotor hub.

A method of handling the pitch bearing unit of a rotor blade mounted to the hub of a wind turbine, the method including the steps of providing an extension assembly at the interface between the rotor blade and the hub, moving the rotor blade outward from the hub by means of the extension assembly to open a gap large enough to accommodate the pitch bearing unit while maintaining a connection between the rotor blade and the hub, and removing the pitch bearing unit through the gap.

A wind turbine, including a hub, a blade, a blade bearing which is connected to the hub and which enables a rotational movement of the blade relative to the hub, and an adjustment device for adjusting a pitch angle of the blade, wherein the adjustment device includes at least one actuator and wherein an effective direction of an adjustment force of the at least one actuator when adjusting the pitch angle of the blade is tilted in an angle relative to a bearing plane of the blade bearing. One advantage of the wind turbine is that the adjustment force for adjusting the pitch angle is transmitted directly into the blade bearing or the bearing plane. Further, an offset of the attacking point of the adjustment force can be reduced or completely avoided.

A wind turbine is provided, including a hub, a blade shaft which is connected to the hub, a rotor blade which is connected to the blade shaft, a fixed bearing arrangement which is arranged at a blade end) of the blade shaft, and a floating bearing arrangement which is arranged at a hub end of the blade shaft, wherein the bearing arrangements enable a rotational movement of the rotor blade relative to the blade shaft. One advantage of the wind turbine including the bearing arrangements is that a better distribution of the loads is achieved. Further, the serviceability is better compared to bearings with rolling elements.

A rotary connection for a rotor blade of a wind turbine. The rotary connection is used, for example, for adjusting a rotor blade of a wind turbine. The rotary connection according contains an outer ring and an inner ring. The inner ring has a contact surface in the direction of the rotor blade and a screw fixing surface in the direction of the rotor hub. The contact surface and the screw fixing surface are arranged parallel to each other and provided with passage holes, which each have a central axis. Rolling elements are arranged in at least two running rows located under each other between the outer ring and the inner ring, wherein the rolling elements each have a rolling element diameter. According to the invention, at least the lower running row is arranged with its rolling element centre underneath the screw fixing surface.

Described is a tool and apparatus for positioning a blade for a wind turbine the wind turbine including a tower and a rotatable hub on the tower. The tool is mounted on a side of the tower so that the blade is supported on the tower in an initial configuration. The tool includes a first part arranged to be angularly movable relative to a second part for tilting the blade with respect to the tower to position the blade in a position that can allow the blade to be connected to the hub.

A lubrication system for a pitch bearing of a wind turbine includes a lubricant for lubricating contact surfaces between an outer race, an inner race, and a plurality of rolling elements of the pitch bearing. Further, the lubrication system includes a lubricant inlet formed into a first side of the inner race and an inlet seal for sealing the lubricant inlet so as to prevent the lubricant from leaking from the lubricant inlet. Moreover, the lubrication system includes a lubricant outlet formed into an opposing, second side of the inner race and a lubricant collection container arranged adjacent to and in fluid communication with the lubricant outlet and mounted to the inner race. Thus, during operation of the wind turbine, at least one of a slope of the pitch bearing, gravity, and a centrifugal effect cause the lubricant to flow throughout the pitch bearing to lubricate the contact surfaces without exiting a closed volume defined by the inlet seal(s) and the lubricant collection container(s).