A wind turbine includes a main shaft rotatable around a rotation axis. The main shaft includes a first piece axially extending along the rotation axis, at least a second piece axially extending along the rotation axis, the second piece being axially adjacent to the first piece, a plurality of connections for fixing the second piece to the first piece.

Provided is an assembly structure of sun gear shaft and spline shaft of a gearbox for wind turbine. The assembly structure relates to the technical field of gearboxes for wind turbine and includes a sun gear shaft, a spline shaft, a mechanical pump drive gear, and a distance ring. The spline shaft is a hollow shaft. One end of the sun gear shaft is inserted into the spline shaft. The one end of the sun gear shaft inserted into the spline shaft is connected to the spline shaft through a spline pair. The mechanical pump drive gear is mounted at one end of the spline shaft. The inner diameter of the mechanical pump drive gear is less than the inner diameter of the spline shaft. The distance ring is disposed in the spline shaft. One end of the distance ring abuts against the inner side of the mechanical pump drive gear and is securely connected to the mechanical pump drive gear. Another end of the distance ring is spaced from the one end of the sun gear shaft in the spline shaft.

A convector includes a stator made up of an array of fixed, parallel, equally spaced, equally thick, thermally conductive plates attached to a relatively thick thermally conductive plate. Convectors are provided with a rotor that is made up of an array of flat, rotatable, parallel, equally spaced, equally thick discs. The discs of the rotor are placed between the plates of the stator at relatively close proximity from the walls of the stator plates. Furthermore, the discs are keyed or held in place with the help of spacers and compression nuts to a hollow or a solid shaft. A clearance aperture, circular in shape, is provided on the stator plates. The shaft is held in place at both ends by roller bearings that provide the means for the shaft to rotate. To impart rotational motion to the rotor, the shaft is attached to an external device such as a motor.

Wind turbine having a hollow, walkable generator shaft of a generator assembly and a hollow hub attached to the generator shaft and having at least two blades attached to it, wherein the hub is enterable from the generator shaft and the wind turbine is stoppable in at least two predetermined maintenance positions of the blades, wherein the wind turbine further comprises a safety arrangement, in which a rotatably supported safety element having a door is mounted covering the opening leading from the generator shaft into the hub, wherein a locking arrangement for fixing the safety element in an entering position, in which the door is vertically oriented, is provided.

Provided is a wind turbine including: a tower, a nacelle mounted on the tower, an electrical generator housed in the nacelle, a wind rotor rotatably coupled to the nacelle for rotating about a rotational axis and having at least one rotatable blade, two rotating shafts for connecting the wind rotor to the electrical generator, a shaft connector for rigidly connecting the two rotating shafts. The shaft connector includes: a hollow body, at least an inner flange protruding from the hollow body towards an axis of rotation of the shaft connector, the inner flange being connectable to one of the two rotating shafts, at least one hole provided on the hollow body for accessing the inner flange.

The invention relates to a shaft for supplying air to a fuel cell, comprising a tubular body (12), at least sections of which are hollow, and which has a first component (14) and a second component (16) that are connected to one another at respective neighbouring axial end sections (14a, 16a), and wherein air can flow through a hollow space (12a) of the tubular body (12) for cooling components arranged next to the shaft (10). The invention also relates to a radial compressor (1). The invention further relates to a method for producing a radial compressor (1).

A device for mounting a line pipe in a rotor shaft of a wind turbine. The invention also relates to a rotor shaft for a wind turbine and to the wind turbine itself. The device includes a rotor shaft which is configured to be partially hollow and in which the line pipe is arranged. In the line pipe, different media are routed from a fixed nacelle of the wind turbine in the direction of a rotor hub connected to the rotor shaft. These can be not only electrical lines but also optical waveguides and media lines for gases and liquids. The mounting of the line pipe is achieved by a device having a plurality of eccentric fixing elements, wherein the line pipe is oriented concentrically by rotating the eccentric fixing elements.

Methods and devices for accessing a drive train for a wind turbine utilize an elastic coupling. The drive train comprises a rotor shaft configured to be driven by a rotor about a main axis and a support structure including a bearing housing surrounding at least one bearing and supporting the rotor shaft for rotation about the main axis to constrain other movements of the rotor shaft. A gearbox input shaft and housing supports the gearbox input shaft for rotation while constraining other movements of the gearbox input shaft. The gearbox input shaft is coupled to the rotor shaft by an elastic coupling comprising a first coupling part rigidly connected with the rotor shaft, a second coupling part rigidly connected with the gearbox input shaft, and elastic elements positioned between the first and second coupling part to provide a single joint between the rotor shaft and the gearbox input shaft.

A spinning device comprising a blade assembly includes a hollow body, and a rod coupled to the hollow body and supported via a magnetic levitation assembly is configured to generate energy.

Turbochargers include a compressor comprising a compressor body extending from a compressor back face and a plurality of blades extending from the compressor body, a turbine comprising a turbine body extending from a turbine back face and a plurality of blades extending from the turbine body, and a shaft coupled at a first end to the compressor back face and at a second end to the turbine back face. The shaft includes an internal passage extending from the first end towards the second end in fluid communication with the compressor blades and one or more fans disposed within the internal passage and configured to draw air toward the second end of the shaft. The internal passage of the shaft is in fluid communication with the compressor blades via one or more bleed air passages, which can be biased towards an outer diameter of the compressor body.