Patent ID: 8096778

Claim:
Structural beam ( 1 ) of a wind turbine blade made up of a first body or body-root ( 2 ) made from a composite material with a first part ( 4 ), near to the wind turbine hub, cylindrical in shape, a third part ( 6 ) in the shape of a box and a second part ( 5 ) with transitional shape between the first and third part, and a second body or body-trunk ( 3 ) in the shape of a box with a decreasing section towards the blade tip, characterised in that the body-trunk ( 3 ) is comprised of various piles ( 26 ) each one of them formed by various layers of carbon fibre impregnated with synthetic resin ( 14 ), situated on the upper areas ( 7 ) and lower areas ( 9 ), intercalating between various layers of fibre glass impregnated with synthetic resin ( 15 ) arranged along the perimeter, including between two piles ( 26 ) at least one layer of reinforcing material ( 16 ) on each of the side areas ( 11 , 13 ) enveloped by an adhesive resin film.