A one-piece planetary carrier includes first and second side walls connected to one another by a plurality of webs. At least one of the webs has a curved outer surface which is directed substantially outward in a radial direction and belongs to a lateral surface of the web. The web includes a transition to the first side wall and a transition to the second side wall. The curved outer surface is convexly curved about a first axis of curvature at the transition to the first skis wall and the transition to the second side wall. The curved outer surface has at least one anticlastic region which lies in an axial central section and an axial edge section of the web, with a combination of the axial central section with the axial edge section substantially defining an axial dimension of the planetary carrier.

A bearing lubrication structure for a wind power gearbox includes a housing, a bearing, a planet carrier, and an oil scraper assembly. The planet carrier is rotatably disposed on the housing through the bearing. A first end face of the planet carrier and a second end face of the housing form a receiving chamber. The oil scraper assembly is disposed on the second end face and is located in the receiving chamber. The oil scraper assembly includes an oil scraper member. The oil scraper member is configured to, when the planet carrier rotates, collect oil from the first end face and make the oil flow into the bearing.

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 wind turbine drive system includes a plurality of drive devices, a state quantity detection unit, and a control unit. The plurality of drive devices are provided in a first structure (a nacelle), and a ring gear is provided in a second structure (a tower). Each of the drive devices includes a motor drive portion, a speed reducing portion, and a motor braking portion for braking the motor drive portion. The state quantity detection unit detects a load between a meshing portion of each of the drive devices and the ring gear. Based on the thus detected load for the each of the drive devices, the control unit controls at least one of the motor drive portion and the motor braking portion so as to reduce a degree of variation in the load among the drive devices.

The present subject matter relates to a gearbox system for a wind turbine. The gearbox may have a gearbox housing defining an inner gearbox volume. The gearbox system further comprises at least one reservoir for storing lubricant and a lubricant provision arrangement. In addition, a lubricant return arrangement is provided. Thus, the gearbox system comprises a lubrication cycle, in particular a closed lubrication cycle, wherein lubricant is provided from the reservoir through the lubricant provision arrangement to lubrication locations of the gearbox, and is subsequently returned to the reservoir passing through the lubricant return arrangement. Furthermore, the gearbox system includes an aeration arrangement which is connected to the gearbox volume and which has specifically configured restriction means. In order to obtain a beneficial operational behavior of the gearbox system, the gearbox system, in particular the reservoir, the pump, the lubricant provision arrangement and/or the aeration arrangement, is/are configured such that a lubricant flow, having an appropriate pressure and flow rate, is provided from the reservoir to each lubrication location, when the pump is operative; further, the gearbox volume gets flooded with lubricant from the reservoir, when the pump is or becomes inoperative.

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 hydraulic control system HCS for controlling a variable ratio transmission of a power generating system. A hydraulic motor/pump unit 140 is operably connected to a superposition gear, and is connected to a hydraulic circuit that comprises an orifice 28 and/or a relief valve 29 that opens at a predetermined hydraulic pressure. The hydraulic circuit switches between a variable low-speed operating mode and a torque limiting high-speed operating mode. In the torque limiting high-speed operating mode the hydraulic motor/pump unit 140 is driven by the superposition gear and drives hydraulic fluid through the orifice 28 and/or relief valve 29 to provide a passive torque limiting function. In the variable low-speed operating mode the hydraulic motor/pump unit 140 drives the superposition gear and the hydraulic control system provides a desired rotor 101 speed by controlling hydraulic fluid flow rate through the hydraulic motor/pump unit 140.

A planetary gear train for a wind power plant includes a planetary stage rotating in a gear train housing, a spur gear stage downstream of the planetary stage, a sun wheel shaft which is non-rotatably connected to a sun wheel of the planetary gear stage, and a hollow shaft which is coaxially surrounded by a spur gear of the spur gear stage and is non-rotatably connected to the spur gear. The sun wheel shaft and the hollow shaft are non-rotatably connected to each other by a toothed coupling, with an outer toothing of the sun wheel shaft meshing with an inner toothing of the hollow shaft. The planetary gear train includes oil-guide ducts which produce a connection between an oil inlet connected to the gear train housing, on the one hand, and the toothed coupling and the axial contact surface, on the other hand.

A one-way clutch, disposed between an input rotating body and an output rotating body, is used to connect the input and output rotating bodies so that the rotating bodies are rotatable integrally in a state in which the rotation speed of the input rotating body is higher than that of the output rotating body and to cut off the connection between the input and output rotating bodies in a state in which the rotation speed of the input rotating body is lower than that of the output rotating body. A plurality of engaging elements or an inner ring and an outer ring constituting the one-way clutch are made of a base material obtained by subjecting a martensitic stainless steel material to soft nitriding treatment, and the Vickers hardness of the portion up to 20 μm from the surface of the contact portion thereof is 1000 to 1500 Hv.

A system and method for adding oil to the gearbox of a water pump windmill includes a tubular head lift rod in the gearbox attached to a tubular tower lift rod. Pressurized oil introduced into the tower lift rod flows through an interior passageway in the tower lift rod, to an interior passageway in the head lift rod, and out an oil dispersion aperture in the head lift rod and into the gearbox. The system allows a user to add oil to a windmill gearbox located at the top of a windmill tower from ground level by propelling the oil through the tower lift rod and head lift rod. Also disclosed is an accompanying method.