A wind turbine has a drive train that comprises a rotor shaft and a planetary gear train having a first gear stage, the rotor shaft being connected to the planet carrier of the first gear stage in a fixed and backlash-free manner. The rotor shaft is supported, on the side that faces away from the first gear stage, by a toroidal roller bearing, on a first carrying structure. The planet carrier that is connected to the rotor shaft in a fixed and backlash-free manner is supported by a moment bearing, as a fixed bearing. The outer ring of the moment bearing is connected to a housing. The combination of the outer ring of the moment bearing and the housing is connected to a second carrying structure via at least three elastic suspension elements arranged in an annular manner around the rotor axis.

A drive train arrangement preferentially for a wind power plant having a rotor shaft, a generator, and a gear, which is indirectly or directly connected to the rotor shaft and the generator. The gear is at least partly or completely integrated in the rotor shaft.

A flight simulator having a wind tunnel with a vertical flight chamber and a second vertical chamber communicatively coupled thereto via air flow conduits. A nacelle disposed within the second vertical chamber includes a fan and a ratio gearbox connected to the fan. A motor is disposed remote from the nacelle for powering the fan via a jackshaft and the ratio gearbox. A variable frequency drive responsive to a control signal from a programmable logic controller regulates the speed of the motor.

An electromechanical system transfers rotational energy, torque and power in a powertrain coupled with a first, a second and a third machine for energy conversion (2, 3, 4). A superimposed gearing (1) includes a planetary gearbox (7) with a sun gear (8), coupled by a first shaft (5) transferring a torque to the first machine (2), and a planetary gear (9) coupled by a second shaft (6) transferring a torque to the second machine (3). The third machine (4) is configured as a three-phase synchronous machine. An internal gear (10) of the planetary gearbox (7) forms a rotor of the three-phase synchronous machine (4). The internal gear (10) is connected to a housing (15) of the planetary gearbox (7), and permanent magnets (11), exciting the three-phase synchronous machine, are arranged on the internal gear (10) and/or on the housing (15) of the planetary gearbox (7).

The invention relates to a system for rotating a fan (2) of a turbojet engine (1) about a first rotation axis , including a reduction gear (3) made up of a planetary gearset placed at the centre of the fan (2), which includes: a central sun gear (31); an outer planet gear (33) attached to the fan (2); at least one satellite gear (32) arranged between the central sun gear (31) and the outer planet gear (33) in order to transmit a rotary movement between the central sun gear (31) and the outer planet gear (33); characterised in that the outer planet gear (33) includes an inner portion (33a) which meshes with the satellite gear (32), as well as an outer portion (33b) to which blades (21) of the fan (2) are directly attached.

A bell housing includes a first region configured to be secured in a nacelle of a wind turbine, a second region configured to receive a gear mechanism, and a wall connecting the first region and the second region together. The wall is provided with at least two recesses.

A planetary transmission includes at least two planetary stages. A sun shaft of a planetary stage of the at least two planetary stages is connected for transmission of torque via a coupling toothing system to a planetary carrier of a second transmission stage of the at least two planetary stages that follows the first transmission stage. The coupling toothing system is a flat notch toothing system. A drive train of a wind power plant, in which a corresponding planetary transmission is used as transmission, is also provided. A wind power plant that is equipped with a corresponding drive train is provided. An industrial application that has a corresponding planetary transmission as transmission is also provided.

A repair system for a gearbox of a wind turbine includes for removably coupling to the first portion of the gearbox housing of the gearbox. The lifting apparatus is adapted for lifting the first portion of the gearbox housing relative to the second portion gearbox housing. The repair system also includes at least one gearbox housing support member for mounting to the second portion of the gearbox housing. The at least one gearbox housing support member provides a support surface for the first portion of the gearbox housing during a repair procedure of the gearbox. The support surface is offset from the second portion of the gearbox housing.

A spur gear transmission with at least two intermeshing spur gears the teeth of which are in meshing engagement with one another, and each of which are rotatable via an axis of rotation. The spur gear transmission has an enveloping wall which surrounds the two spur gears in circumferential direction and in the direction of the axes of rotation. The enveloping wall has an inner contour which is adapted to the outer diameter of the spur gears in such a manner that two annular gaps which merge into each other are formed between the enveloping wall and the spur gears. One annular gap respectively is arranged at least substantially concentrically with respect to a respective axis of rotation. The enveloping wall is formed by a two-part housing which is closed along a parting line and which has an upper part and a lower part.

A gear arrangement, in particular for a rotary connection of a wind turbine, comprising a first gear, a second gear in engagement with the first gear, wherein in the engaged position a gap space is provided between a first tooth and a second tooth of the first gear and a tooth of the second gear, and a sealing element which seals off the gap space to prevent lubricant escape.