Wind turbine power transmission system

Abstract

The present invention relates to a wind turbine (2) comprising a nacelle (8) mounted on top of a tower (12), a rotor including a hub (6) and a number of blades (4), a main shaft (16) supported by the nacelle (8) and configured to be driven by the rotor about a main axis, a generator (28) having a generator rotor and a generator stator, and a gearing (25) arranged to increase the rotational speed between the rotor and the generator rotor. The gearing (25) comprises a fixed ring gear (50), an input member (53) connected to or driven by the main shaft (16) and having a plurality of radially movable toothed portions (52, 63) carried in a guide slot and having outer ends engageable with the ring gear (50), and a central output member (55) mounted within the input member (53) and having an outer eccentric profile acting on inner ends of the plurality of radially movable toothed portions (52, 63) to drive them, whereby rotational movement of the input member (53) drives the plurality of radially movable toothed portions (52, 63) through engagement with the ring gear (50) to rotate the central output member (55).

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