A method for providing gearbox lubrication of a wind turbine during an off-grid state includes fluidly coupling an auxiliary lubrication system with a gearbox of the wind turbine. The off-grid state is characterized in that the wind turbine is mechanically and electrically installed at a wind farm but not yet connected to a grid. The method also includes determining a time-based control scheme for the auxiliary lubrication system to provide lubrication to the auxiliary lubrication system during the off-grid state. The time-based control scheme is defined a first time period in which the lubrication is provided to the gearbox via the auxiliary lubrication system during the off-grid state and a second time period in which the lubrication is not provided to the gearbox via the auxiliary lubrication system during the off-grid state. The first time period is less than the second time period. Further, the method includes implementing, via a controller, the control scheme for the auxiliary lubrication system to provide the lubrication to the gearbox of the wind turbine during the off-grid state.

A planetary transmission includes first and second planetary stages. At least one of the first and second planetary stages includes a transmission component. The planetary transmission further includes a pilot bearing, and a double-walled pipe received in the pilot bearing and having a central portion designed to have an outlet point for dispensing lubricant into the transmission component. A bushing is disposed in a region of the outlet point such that a gap is formed between the bushing and the transmission component.

The present invention relates to a lubrication ring, a wind turbine gearbox, a method of assembly thereof and a wind turbine. The lubrication ring is formed by a number of ring segments that are positioned relative to each other in the circumference direction. The ring segments each have a first connection element and a second connection element, which are spaced apart to form a gap that takes up the thermal expansion of the ring segments. The lubrication ring forms at least one fluid channel for transferring lubrication fluid between a first gearbox part and a second gearbox part positioned relative to each other. Each ring segment has at least one mounting point for securing the ring segment to the first or second gearbox part and at least one first opening for guiding the lubrication fluid through the lubrication ring.

A control device for a gearbox which includes a mechanical pump and an electric pump, with the mechanical pump having a first-stage displacement and a second-stage displacement, and the first-stage displacement being less than the second-stage displacement. The control device includes a sensor module for detecting an input speed of a wind wheel, and a rotation speed of the electric pump. The control device also includes a mechanical pump control module for, when the input speed of the wind wheel is greater than or equal to a speed threshold, controlling the mechanical pump to operate at the first-stage displacement, and when the input speed of the wind wheel is less than the speed threshold and the rotation speed of the electric pump is less than a rotation speed threshold, controlling the mechanical pump to operate at the second-stage displacement.

A transmission for a wind turbine has at least one transmission housing and a planetary gearset arranged therein. A planet carrier of the planetary gearset forms a drive of the transmission. In the wind turbine, the planet carrier is borne on a rotor shaft of the wind turbine. At one end facing a rotor of the wind turbine in the wind turbine, the transmission housing has a radially extending end portion. In addition, the transmission arrangement has a sealing element that seals the radially extending end portion to the planet carrier in order to seal an inner chamber of the transmission housing on a rotor side.

A shaft-hub connection for a planetary transmission includes an inner hub element and an outer hub element which is connected via a spline toothing in driving relationship with the inner hub element about a main axis of rotation and surrounding the inner hub element at an outer circumference. The inner hub element and the outer hub element bear against one another via a pairing of axial contact surfaces. An oil channel is formed by the inner hub element in a region of an axial position of the axial contact surfaces for oiling of the axial contact surfaces and opens out radially within the axial contact surfaces via an outlet mouth.

The present invention relates to a drivetrain of a wind turbine and a wind turbine with the drivetrain, wherein the drivetrain comprises at least a gearbox, a generator and a lubrication system. The lubrication system comprises at least a pump unit, a main filter system, a heat exchanger and a distribution unit. A secondary filter system is arranged upstream relative to the distribution unit and downstream relative to the heat exchanger. The first filter system has at least one first filter with a first filtration range and the secondary filter system has at least one second filter with a second filtration range. The first filtration range differs from the second filtration range.