A nacelle for a wind turbine includes: a nacelle housing; a rotor shaft; a rotor hub, arranged on the rotor shaft; a first rotor shaft bearing for bearing the rotor shaft on the nacelle housing; and a second rotor shaft bearing. The first rotor shaft bearing and the second rotor shaft bearing are arranged at an axial distance to one another and the first rotor shaft bearing is arranged closer to the rotor hub than the second rotor shaft bearing. The first rotor shaft bearing has a first sliding surface having an averaged first sliding surface diameter and the second rotor shaft bearing has a second sliding surface having an averaged second sliding surface diameter. The first sliding surface faces away from the rotor hub at least in some sections, wherein the first sliding surface and the second sliding surface face one another at least in a partial section.

In accordance with a method for assembling a rotor bearing arrangement of a wind turbine, individual slide bearing pad are inserted in the bearing block. The bearing block fitted with the slide bearing pads is then joined to a rotor block. During the joining of the rotor shaft and of the bearing block fitted with the slide bearing pads, the rotor shaft may be installed on a rotor shaft support so as to be vertically upright. A rotor shaft flange of the rotor shaft may rest on the rotor shaft support. The bearing block fitted with the slide bearing pads may be placed upon the rotor shaft vertically from above.

A wind turbine planet gear shaft has a shaft body with an outer surface, a segment of the outer surface being a slide bearing surface configured to form a radial slide bearing with an inner opening of a planet gear. The slide bearing surface has a first portion configured as a non-load-bearing zone and a second portion configured as a load-bearing zone and exactly one axially elongate oil pocket in the slide bearing surface, that oil pocket being located in the non-load-bearing zone. An oil supply channel in the shaft body has a first end in communication with the oil pocket, and first and second oil return channels in the slide bearing surface each have a first end at a longitudinal end of the oil pocket and a second end open to ambient air.

A plain bearing sleeve includes an inner diameter, a sleeve length greater than the inner diameter, an outer diameter, and a wall thickness smaller than 8% of the inner diameter. A sleeve blank includes a longitudinal axis, an outer surface, an inner surface, a first end face, a second end face opposite the first end face, and at least three threaded holes arranged on the first end face. A method for producing the plain bearing sleeve includes clamping the outer surface at the first end face for rotation, machining the inner surface to the inner diameter, fixing the first end face at the at least three threaded holes for rotation, machining the outer surface to the outer diameter, clamping the inner surface at the second end face for rotation, and cutting a ring with the first end face and the at least three threaded holes from the sleeve blank.

A bearing arrangement for a rotating component of a wind turbine includes a first roller bearing and a second roller bearing. The rotating component defines a rotational axis and is supported by the first roller bearing and the second roller bearing. A bearing housing supports the roller bearing. The first roller bearing, the second roller bearing, the rotating component and the bearing housing are arranged to conjointly define a pretension circuit. A first bearing outer ring is axially moveable along the rotational axis with respect to the bearing housing and/or is radially deformable with respect to the rotational axis. An actuation device extends through an opening of the bearing housing and is accessible from outside of the bearing housing. Upon actuation of the actuation device, the pretension of the bearing arrangement is adjusted.

A bearing arrangement for a rotating component of a wind turbine includes two roller bearings. The rotating component is supported by the second roller bearings and a bearing housing. The roller bearings, the rotating component and the bearing housing are arranged to form a pretension circuit. The first roller bearing includes a first bearing inner ring, a first bearing outer ring and rolling elements. The first bearing outer ring is axially moveable along the rotational axis with respect to the bearing housing and/or radially deformable with respect to the rotational axis. An adjustment device extends through a through-hole of the bearing housing and is accessible from outside the bearing housing. Upon actuation, the adjustment device causes an axial movement and/or a radial deformation of the first bearing outer ring to adjust the pretension of the bearing arrangement.

A main bearing unit of a wind turbine drivetrain is provided, including a number of bearings arranged about a low-speed shaft of the drivetrain; a housing arranged to enclose the bearings; a preload ring arranged between an inner surface of the housing and the outer race of a bearing, which preload ring is adapted to facilitate its axial displacement during a bearing preload reinstatement procedure; and a fastener for fixing the position of the preload ring to the housing following a bearing preload reinstatement procedure. Also provided is a bearing preloading arrangement for use in reinstating preload in a bearing of such a main bearing unit; and a method of reinstating a preload force in a bearing of such a main bearing unit.

The present application relates to discloses a transmission system and a wind turbine generator system, the transmission system includes: a gearbox, including a housing, an output shaft and a bearing, the output shaft being rotatably connected with the housing through the bearing; a generator, including a rotor, a stator and a packaging assembly, the stator being connected with the housing, the rotor being connected with the output shaft, and the packaging assembly including a cover, a first connecting member and a second connecting member, the cover is located on the same side of both the output shaft and the rotor, is connected and fixed with the rotor through the first connecting member, and is connected and fixed with the output shaft through the second connecting member; the cover is insulated from both the first connecting member and the rotor, and the cover is insulated from both the second connecting member and the output shaft. The transmission system and the wind turbine generator system provided by the embodiments of the present application can reduce the influence of the shaft voltage to the bearing and has a low cost.

A transmission assembly for coupling a forerunning gearbox stage to a generator of a wind turbine is provided, the transmission assembly including an intermediate speed shaft supported by an intermediate speed shaft bearing arrangement and including an intermediate speed shaft gear, a high-speed shaft supported by a high-speed shaft bearing arrangement and including a high-speed shaft gear, and a gear mesh formed by an engagement of the intermediate speed shaft gear and the high-speed shaft gear, wherein the gear mesh is configured to transfer a torque between the intermediate speed shaft and the high-speed shaft.

A plain bearing sleeve includes an inner diameter, a sleeve length greater than the inner diameter, an outer diameter, and a wall thickness smaller than 8% of the inner diameter. A sleeve blank includes a longitudinal axis, an outer surface, an inner surface, a first end face, a second end face opposite the first end face, and at least three threaded holes arranged on the first end face. A method for producing the plain bearing sleeve includes clamping the outer surface at the first end face for rotation, machining the inner surface to the inner diameter, fixing the first end face at the at least three threaded holes for rotation, machining the outer surface to the outer diameter, clamping the inner surface at the second end face for rotation, and cutting a ring with the first end face and the at least three threaded holes from the sleeve blank.