Abstract: A wind turbine gearbox is disclosed for transmitting a wind generated rotary input to multiple electrical generators. The gearbox includes a first gearbox stage with a first bull gear and at least five first pinion gears. The first bull gear receives the wind generated rotary input and the pinion gears mesh with the first bull gear to generate at least five first rotary outputs. The first output shafts, fixed relative to the pinion gears and suspended in plain bearings, transmit the first rotary outputs to the electrical generators via a second gearbox stage. The first gearbox stage has a gear ratio of 5:1 or more, and the second gearbox stage has a gear ratio equal to or less than that of the first gearbox stage gear ratio.

Abstract: The present invention relates to a gearbox for a wind turbine comprising: an input shaft portion adapted to be operatively connected to a wind turbine rotor shaft; and input hear wheel having teeth arranged around an outer or inner circumference of the wheel, and being attached to the input shaft portion such as to rotate with the input portion; one or more pinions including a pinion wheel arranged on a pinion shaft, the pinion wheel having teeth arranged to engage with the teeth of the input gear wheel, and the pinion shaft being rotatably mounted in a pinion support structure, wherein the input shaft portion is rotatably mounted with respect to the pinion support structure.

Abstract: The present invention relates to a gearbox for a wind turbine comprising: an input shaft portion adapted to be operatively connected to a wind turbine rotor shaft; and input hear wheel having teeth arranged around an outer or inner circumference of the wheel, and being attached to the input shaft portion such as to rotate with the input portion; one or more pinions including a pinion wheel arranged on a pinion shaft, the pinion wheel having teeth arranged to engage with the teeth of the input gear wheel, and the pinion shaft being rotatably mounted in a pinion support structure, wherein the input shaft portion is rotatably mounted with respect to the pinion support structure.