A main bearing unit for supporting the rotor shaft of a wind turbine, including a rolling bearing having an inner ring, an outer ring and a rolling element arrangement received between the outer and inner ring and a coupling arrangement which is designed to couple the rotor shaft to an output shaft of the wind turbine at least indirectly and so as to transmit torque. The rotor shaft is coupled to one of the outer and inner ring so as to transmit torque. The coupling arrangement is coupled so as to transmit torque to the one of the outer and inner ring as the rotor shaft.

Provided is a fluid film bearing, especially for a rotor hub in a wind turbine, including an inner part that supports a rotating outer part, wherein the inner part includes multiple radial pads distributed along the outer circumference of the inner part, each of the radial pads having at least one radial pad sliding surface, wherein the radial pad sliding surfaces support at least one outer part sliding surface of the outer part in the radial direction.

A roller bearing assembly for determining loads on a roller bearing includes a roller bearing having coaxial inner and outer rings and an axis of rotation, and a plurality of rollers each having a rotation axis being arranged between the rings. At least one ring has recess for receiving a force-measuring pin. A force-measuring pin is received in the recess. The longitudinal axis of the force-measuring pin extends at least partly along the axis of rotation of the roller bearing. The recess and the force-measuring pin extends into a region, which is under a load, of the ring that has the recess such that at least one vertical projection plane perpendicular to the rotation axis of the rollers extends along the force-measuring pin and a region of maximum load. This allows loads to be reliably measured.

A wind turbine includes a hub, at least one blade and at least one pitch bearing to connect the at least one blade to the hub. The at least one pitch bearing has at least an inner ring and an outer ring, and at least a rolling race. The wind turbine further includes at least a tensioning system configured to exert a radial compression force to at least a part of the outer ring of the at least one pitch bearing, thus increasing the resultant stiffness of the at least one pitch bearing.

A wind power installation rotary connection, in particular a blade bearing or azimuth rotary connection, wherein the rotary connection is in the form of a plain bearing assembly, comprising an inner ring having a number of first plain bearing surfaces, an outer ring having a number of second plain bearing surfaces which are respectively associated with one of the first plain bearing surfaces as a plain bearing surface partner, and wherein the plain bearing assembly is in the form of a dry-running plain bearing assembly.

A generator for a direct driven wind turbine configured to convert kinetic energy of a main shaft of the wind turbine into electrical energy. The generator includes a generator rotor connectable to the main shaft of the wind turbine and a generator stator, the generator includes a generator housing on which the generator stator is arranged. The generator housing includes a front side facing towards a rotor head of the wind turbine in an installed state of the generator and a rear side facing away from the rotor head in the installed state of the generator. The generator includes at least one front generator bearing arranged at the front of the generator housing and a rear generator bearing arranged at the rear of the generator housing.

A wind turbine has a bearing housing, a rolling element bearing within the bearing housing and a space within the bearing housing for containing grease for lubricating the rolling element bearing. A shaft is rotatably supported by the rolling element bearing. A pressure sensor in fluid communication with the space measures the pressure of grease in the space within the bearing housing.

A hydrodynamic journal bearing assembly for a drivetrain of a wind turbine includes a shaft and a semispherical convex surface provided on an outer surface of the shaft, the convex surface extending circumferentially around the shaft and having a convex cross-sectional profile oriented along a longitudinal axis of the shaft. A bearing housing is arranged circumferentially around the semispherical convex surface, the bearing housing having s a reservoir in a bottom portion thereof for a bearing fluid. A static semispherical concave bearing surface in the bearing housing defines a bearing interface with the semispherical convex surface on the shaft, wherein a layer of the fluid is provided in the bearing interface as the shaft and rotates through the reservoir.

A process for determining the reliability of a sensorized bearing configured to measure load and speed is provided. The process includes the following steps. Bearing load and rotational speed are determined from data acquired from the sensorized bearing. Next, an array linking the determined load to the determined n.dm value is filled until that all available loads are parsed. Then a L10 life is determined for each load within a distribution based on the array. Finally, an overall L10 life is determined based on the Palmgren-Minor rule. The load distribution and the L10 lives a bearing reliability R for a given date is determined based on a Weibull curve and the overall L10 life.

A nacelle for a wind turbine, the nacelle comprising: a drivetrain with a drivetrain axis, at least two torque arms positioned around the drivetrain axis and attached to a member of the drivetrain, and a frame attached to a yaw bearing. The torque arms of the drive train are supported by the frame and at least one of the torque arms has an orientation deviating at least substantially from being horizontal.