A main bearing housing for a wind turbine comprising a bearing arrangement having a sump located in a floor region of the main bearing housing. The sump comprises a floor pan surrounded by a side wall and includes an overflow arrangement configured to permit fluid to spill from the sump. The overflow arrangement comprises a spill passage configured with a spill inlet at or near the floor pan of the sump and a spill outlet located in a position between the spill inlet and an upper edge of the sump side wall. An advantage of the invention is that since the spill passage is fed with oil from a position that is close to the bottom of the sump, debris and sediment at the bottom of the sump tends to be entrained with the flow of oil and so tends not to collect at the bottom of the sump. The lubrication system therefore is able to clean the oil more effectively because the debris and sediment is encouraged to circulate around the lubrication system.

In a main bearing replacement method for a wind turbine power generation facility including a nacelle, a rotor head rotatably supported by the nacelle, a drive shaft to which rotation of the rotor head is transmitted, a main bearing disposed between the rotor head and the nacelle, and a coupling connecting the rotor head and the drive shaft on a radially inner side of the main bearing, the wind turbine power generation facility includes a main bearing sleeve fitted and fixed to an inner ring of the main bearing and mounted with the rotor head, and the main bearing is replaced at least while the main bearing sleeve is fitted and fixed to the inner ring of the main bearing.

An elastomer bushing for an elastic bearing of a drive train component of a wind turbine, in particular of a gearbox on a housing, such as a machine carrier, of a wind turbine, may include two half-shells each made of an elastomer part having a Shore hardness of more than 85 Shore A. At least one of the half-shells may have an axial rigidity varying in the direction of its longitudinal axis.

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.

A marine plant assembly comprising a floating vessel and a plant operating unit attached to a buoyancy vessel in such a way that the operating unit is at least partially submerged during operation. At least one link element provides a hinged connection between the operating unit and the buoyancy vessel, thereby to allow movement of the operating unit from its submerged operating position to above the water level and adjacent the buoyancy vessel by said link element rotating into a position substantially parallel to the buoyancy vessel.

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).

A wind turbine gearbox, in particular planetary gearbox, has at least one gear which is mounted on an axle, wherein a sliding surface is arranged between the gear and the axle. The sliding surface is arranged on at least one layer of a deposition welded material made from a sliding bearing material. Furthermore, a method produces the wind turbine gearbox.

A main bearing housing for supporting a main rotor shaft of a wind turbine, wherein the main bearing housing defines a first end, a second end and a floor region intermediate the first and second ends. The main bearing housing comprises a first bearing arrangement positioned at the first end of the main bearing housing, a second bearing arrangement positioned at the second end of the main bearing housing, wherein the floor region includes a first oil sump positioned at the first bearing arrangement, and a second sump positioned at the second bearing arrangement. Advantageously, the embodiments of the invention provide that the bearings of the main bearing housing are lubricated by a lubrication system that includes sumps positioned at each of the fore and aft bearings of the main rotor shaft. The fore and aft bearings are therefore supplied with oil at suitable lubrication points and are part of the lubrication system that supplies oil to other components in the wind turbine that require oil lubrication, for example the gearbox and/or the generator bearings. The fore and aft bearings of the main bearing housing therefore do not require a separate lubrication system, such as a grease-based system and so the overall lubrication requirements for the nacelle are simplified.

A rotary compressor is provided that may include a rotational shaft, first and second bearings configured to support the rotational shaft in a radial direction, a cylinder disposed between the first and second bearings to form a compression space, a rotor disposed in the compression space and coupled to the rotational shaft to compress a refrigerant as the rotor rotates, and at least one vane slidably inserted into the rotor, the at least one vane coming into contact with an inner peripheral surface of the cylinder to separate the compression space into a plurality of regions. At least one of the first bearing and the second bearing may include first and second pockets formed on a surface facing the rotor, and at least one of the first pocket and the second pocket may be formed in an asymmetrical shape.

The present disclosure relates to electrical machines (100, 200) configured to be fed by pulse width modulation from a power converter (170) and comprising a stator (110), a rotor (120), a rotor shaft (130) and one or more bearings (140, 141) arranged between the rotor (120) and the stator (110). The electrical machine (100, 200) further comprising an electrical shunt (160, 161) arranged between the rotor shaft (130) and the stator (110). The present disclosure also relates to methods (500) to mitigate electrical discharge machining bearing currents in electrical machines (100, 200).