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: 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).