Rotary wing aircraft rotor head, rigid in drag and articulated in pitch and flapping

摘要

The invention relates to a rotary-wing aircraft rotor head including an even number of blades arranged in groups of two blades (2) which are diametrically opposite each other, and linked to each other by a connecting system without any link with the hub of the rotor. Each blade (2) is articulated in flapping and in pitch onto the hub body (1) by means of a sleeve (3) which is arranged between the root of the blade (2) and the said hub body (1), this sleeve bearing on the periphery of the said hub body (1) via a laminated spherical stop (5) and including a member for introducing the pitch demand of the blade. Each connecting system for two diametrically opposite blades (2) consists of two tie rods (4) linking the two diametrically opposite sleeves (3) of these blades (2), the two tie rods (4) being arranged parallel to the plane of the rotor on either side of the common longitudinal axis of the two diametrically opposite blades (2), these two tie rods (4) being parallel and substantially separated with respect to the said common longitudinal axis, the attachment of the two tie rods (4) to each sleeve (3) being arranged outside the laminated spherical stop (5) of this sleeve (3) with respect to the axis of the rotor and in such a way that the length of the two tie rods (4) is substantially greater than the distance between the centres of the two diametrically opposite laminated spherical stops (5). Applications to the rotors of helicopters. IMAGE