Flexbeam unit for a bearingless or a hinge- and bearingless multi-blade rotor of a rotary wing aircraft

摘要

The invention is related to a flexbeam unit (3) for a multi-blade rotor (1) of a rotary wing aircraft, said flexbeam unit (3) defining a predetermined number of torsion elements (5a, 5b, 5c, 5d, 5e) that are connectable with associated rotor blades (2a, 2b, 2c, 2d, 2e), at least one torsion element (5d) comprising a flexbeam element (4) having an associated longitudinal direction (4a) and comprising inner layers (17a, 17b) of a first fiber reinforced material that are embedded between outer layers (10) of a second fiber reinforced material, said outer layers (10) being composed of main plies (10a, 10b) comprising unidirectional fibers and said inner layers defining a cross section profile center (4b) in said associated longitudinal direction (4a), said cross section profile center being composed of interconnected bias plies (12a, 12b, 12c, 13a, 13b, 13c, 13d) comprising fibers that are oriented transversely relative to said unidirectional fibers.