Abstract: A gearbox for a wind turbine. The gearbox includes at least one first epicyclical gear stage, at least one second gear stage, and a torque transferring shaft including a shaft part and a connection part, wherein the torque transferring shaft is adapted for connecting a first gear of the first epicyclical gear stage with a second gear of the second gear stage and wherein the torque transferring shaft is connected to the second gear stage via the connection part to form a torque-transferring connection area between the connection part and the second gear stage and wherein the outer diameter of the shaft part of the torque transferring shaft is smaller than an inner diameter of the connection area between said torque transferring shaft and said second gear stage.

Abstract: The invention relates to a wind turbine being provided with a fluid displacement means for ensuring a certain increased pumping capacity at a certain reduced rotational speed of the main shaft of the rotor and thus of a drive shaft from a gear box of the wind turbine. The invention also relates to a wind turbine being provided with fluid displacement means for ensuring a certain increased pumping capacity at a certain increased rotational speed of the main shaft of the rotor and thus of a drive shaft from a gear box of the wind turbine. The means may be mechanical, hydraulic, pneumatic or electrical. Additionally, the invention relates to a method for operating a wind turbine being provided with such fluid displacement means.

Abstract: A gearbox for a wind turbine. The gearbox includes at least one first epicyclical gear stage, at least one second gear stage, and a torque transferring shaft including a shaft part and a connection part, wherein the torque transferring shaft is adapted for connecting a first gear of the first epicyclical gear stage with a second gear of the second gear stage and wherein the torque transferring shaft is connected to the second gear stage via the connection part to form a torque-transferring connection area between the connection part and the second gear stage and wherein the outer diameter of the shaft part of the torque transferring shaft is smaller than an inner diameter of the connection area between said torque transferring shaft and said second gear stage.

Abstract: The invention relates to a lubrication system for a gearbox with stationary and rotating gearbox parts particularly in a wind turbine. The system includes lubrication distribution means in the stationary and rotating gearbox parts such as lubrication bores and openings. One or more rotary transmissions establish a transmission channel between lubrication distribution means in said stationary and rotating gearbox parts where said one or more rotary transmission include at least two connecting means. The invention also relates to a wind turbine with a drive train including a gearbox, and a lubrication system.

Abstract: A gearbox for a wind turbine. The gearbox includes at least one first epicyclical gear stage, at least one second gear stage, and a torque transferring shaft including a shaft part and a connection part, wherein the torque transferring shaft is adapted for connecting a first gear of the first epicyclical gear stage with a second gear of the second gear stage and wherein the torque transferring shaft is connected to the second gear stage via the connection part to form a torque-transferring connection area between the connection part and the second gear stage and wherein the outer diameter of the shaft part of the torque transferring shaft is smaller than an inner diameter of the connection area between said torque transferring shaft and said second gear stage.

Abstract: A composite gear part (4) for a gear arrangement is disclosed. The composite gear part (4) comprises a shaft part (3) adapted to be rotationally mounted in a gear arrangement, an inner part (5) made from a first material, and an outer part (6) made from a second material, said outer part (6) being fixed circumferentially to the inner part (5), and said outer part (6) having a plurality of gear teeth formed therein. The outer part (6) must be made from a material which is sufficiently durable and hard to fulfil requirements to gear teeth. The material may be a surface hardened high-alloyed steel or a high-alloyed cast iron. The material of the inner part (5) need not fulfil such requirements and may, e.g., be cast iron. Accordingly, the required amount of the more expensive and possibly scarce material is reduced. The inner part (5) is formed integrally with the shaft part (3).

Abstract: A wind turbine including a drive train. The drive train includes at least a rotor for transforming wind into rotation of a rotor hub, to provide a drive torque, a generator for transforming at least a part of the drive torque into electrical power, and at least one coupling for connecting a first drive train component to a second drive train component for transferring the drive torque between the components. The coupling includes a first coupling part with a first coupling area, the first coupling area being connected with a second coupling area of a second coupling part, whereby the drive torque is transferred from one of the areas to the other of the areas during operation of the coupling.

Abstract: A wind turbine comprising a system for monitoring at least one wind turbine component including a closed fluid circulating system with a fluid reservoir. The monitoring system comprises establishing a level value of the fluid systems reservoir, and establishing at least one environmental value of the fluid systems reservoir or the surroundings of the system. The level value and the at least one environmental value contributing to defining the fluid systems functionality, and the monitoring system further comprises establishing a monitoring value on the basis of the level value and the at least one environmental value.

Abstract: An epicyclic gear stage for a wind turbine gearbox including a sun gear, at least two planet gears, engaged with the sun gear, an annulus gear, a first planet carrier flange connected to one side of at least two of the planet gears, and a second planet carrier flange connected to the other side of least two of the planet gears. Torque from the wind turbine rotor is transferred via a torque transfer part connected to at least one of the first and second planet carrier flanges at one or more torque transferring zones and the one or more torque transferring zones are located between a first and a second plane, the planes being substantially perpendicular to an axis of rotation of the sun gear.

Abstract: A gearbox for a wind turbine. The gearbox includes at least one first epicyclical gear stage, at least one second gear stage, and a torque transferring shaft including a shaft part and a connection part, wherein the torque transferring shaft is adapted for connecting a first gear of the first epicyclical gear stage with a second gear of the second gear stage and wherein the torque transferring shaft is connected to the second gear stage via the connection part to form a torque-transferring connection area between the connection part and the second gear stage and wherein the outer diameter of the shaft part of the torque transferring shaft is smaller than an inner diameter of the connection area between said torque transferring shaft and said second gear stage.

Abstract: A wind turbine including a drive train. The drive train includes at least a rotor for transforming wind into rotation of a rotor hub, to provide a drive torque, a generator for transforming at least a part of the drive torque into electrical power, and at least one coupling for connecting a first drive train component to a second drive train component for transferring the drive torque between the components. The coupling includes a first coupling part with a first coupling area, the first coupling area being connected with a second coupling area of a second coupling part, whereby the drive torque is transferred from one of the areas to the other of the areas during operation of the coupling.

Abstract: The invention relates to a lubrication system for a gearbox (9) with stationary (10,23) and rotating (11) gearbox parts particularly in a wind turbine (1). The system comprises lubrication distribution means (14,16,18) in said stationary (10,23) and rotating (11) gearbox parts such as lubrication bores and openings. One or more rotary transmissions (15) establish a transmission channel between lubrication distribution (14,16,18) means in said stationary and rotating gearbox parts where said one or more rotary transmissions (15) include at least two connecting means (24a, 24b). The invention also relates to a wind turbine (1) with a drive train including a gearbox (9), and a lubrication system.

Abstract: A gear system (1) comprising a main bearing (3), a main gear (5) and two or more pinion shafts (6). The main bearing (3) directly supports a torque inputting means (2) and defines a rotational axis (4). The pinion shafts (6) are each arranged to mesh with the main gear (5) at an exterior surface (7) of the main gear (5) in such a manner that torque transmitted from the main gear (5) is split into a number of parallel torque paths corresponding to the number of pinion shafts (6). At least the main gear (5), and at least part of its meshes to the pinion shafts (6) are arranged within a perimeter defined by the main bearing (3). The gear system (1) is compact due to the arrangement of the main gear (5) and meshes to the pinion shafts (6). At the same time it is easy and cost effective to manufacture because the pinion shafts (6) mesh to the main gear (5) via the external surface (7).

Abstract: The invention relates to a wind turbine comprising a system for monitoring at least one wind turbine component including a closed fluid circulating system with a fluid reservoir. The monitoring system comprises, means for establishing a level value of the fluid systems reservoir, and means for establishing at least one environmental value of the fluid systems reservoir or the surroundings of the system. The level value and the at least one environmental value contributing to defining the fluid systems functionality, and the monitoring system further comprises means for establishing a monitoring value on the basis of the level value and the at least one environmental value. The invention further relates to a method for monitoring at least one wind turbine component including a closed fluid circulating system with a fluid reservoir and a system for monitoring a mechanical and/or electrical component.

Abstract: The invention relates to a wind turbine comprising at least one gearbox. The gearbox comprises one or more sensors for measuring condition values of the wind turbine, and is characterized in that the one or more sensors are mounted on one or more rotating parts of the gearbox. The invention further relates to an epicyclic gearbox comprising a gearbox housing, one or more gearbox parts rotating in relation to the housing, and one or more sensors for measuring condition values of the gearbox. The epicyclic gearbox is characterized in that, the one or more sensors are mounted on one or more of the rotating parts of the gearbox.

Abstract: The invention relates to a wind turbine being provided with a fluid displacement means for ensuring a certain increased pumping capacity at a certain reduced rotational speed of the main shaft of the rotor and thus of a drive shaft from a gear box of the wind turbine. The invention also relates to a wind turbine being provided with fluid displacement means for ensuring a certain increased pumping capacity at a certain increased rotational speed of the main shaft of the rotor and thus of a drive shaft from a gear box of the wind turbine. The means may be mechanical, hydraulic, pneumatic or electrical. Additionally, the invention relates to a method for operating a wind turbine being provided with such fluid displacement means.