Patent ID: 7021897
Filing Date: 2006-04-04
Classification: B64C

Abstract:
1. A cyclic swashplate device to control the pitch of rotorcraft rotor ( 1 ) blades ( 2 ), such as a main helicopter rotor, a rotor ( 1 ) on which each blade ( 2 ) is, on the one hand, driven in rotation about an axis of rotation (Z—Z), of a rotor ( 1 ) shaft ( 3 ) through a hub ( 4 ) integral in rotation with shaft ( 3 ), and on the other hand, integral in rotation about a longitudinal pitch change axis (A—A) of blade ( 2 ) of at least one pitch lever ( 5 ) controlled by a corresponding pitch connecting rod ( 6 ), said device ( 10 ′) being of the type with two annular and coaxial disks ( 12 ′, 14 ′) enclosing rotor ( 1 ) axis (Z—Z) and mounted on an axial and tilting translation guide mechanism ( 11 ′) of said disks with respect to rotor axis (Z—Z), and of which one is a rotating disk ( 12 ′) connected, on the one hand to said hub ( 4 ) and/or said shaft ( 3 ) by at least one device driving ( 13 ) the rotating disk ( 12 ′) to rotate with rotor ( 1 ) about its axis (Z—Z) and, on the one hand, each blade ( 2 ) by the corresponding pitch connecting rod ( 6 ), said rotating disk ( 12 ′) being mounted in rotation by at least one bearing ( 21 ′) on the other disk, which is a non-rotating disk ( 14 ′) connected, on the one hand, to the structure ( 15 ) of said rotorcraft by at least one retaining device ( 16 ) immobilizing said non-rotating disk ( 14 ′) in rotation about said rotor axis (Z—Z), and on the other, pilot control devices ( 17 ) soliciting the non-rotating disk ( 14 ′) in such a way that the axial and/or tilting translation movements imposed on the non-rotating disk ( 14 ′) from the pilot controls ( 17 ) are followed by the rotating disk ( 12 ′), which transmits the pitch to be set on the rotor ( 1 ) blades ( 2 ) by means of pitch connecting rods ( 6 ), with said rotating disk ( 12 ′) comprising a modular set of interconnecting fittings ( 46 ) attached rigidly ( 45 ) and removably to an annular device ( 31 ′) to ensure links between this rotating disk and the pitch connecting rods ( 6 ) and/or said at least one driving device ( 13 ), characterized in that said non-rotating disk ( 14 ′) includes a modular set of link fittings ( 42 ) attached rigidly ( 41 ) and removably to an annular device ( 30 ′) to ensure the links between this non-rotating disk and the pilot control devices ( 17 ) and/or said at least one retaining device ( 16 ).