COAXIAL MAIN ROTOR OF ROTORCRAFT Russian patent published in 2021 - IPC B64C27/35 B64C27/10 B64C11/04 

FIELD: aviation.

SUBSTANCE: invention relates to the field of aviation, in particular to the structures of the bearing systems of helicopters. The coaxial main rotor of the rotorcraft contains the lower and upper main rotors, bushings (1, 6), swash plates (3, 7). The outer ring (22) of the upper swash plate (3) is connected by rods (28) with the outer ring (31) of the lower swash plate (7), which is attached to the main gearbox (12). On the bottom of the gearbox (12) there is a mechanism (8) of the general and differential pitch of the lever-threaded type of the mechanism (8), which includes the intra-shaft control rods (9, 10) of the upper (2) and lower (4) sliders, respectively. Each of the two bushings (1, 6) consists of a housing (48), to which sleeves for attaching the blades are attached. Each sleeve contains a casing (49), inside which an elastic beam (30) is installed, which has an eyelet (52) with two pairs of holes (54) for fixing the blade with a bolted connection, as well as two holes (53). The plate torsion bar (47) on one side is connected to the bushing body (48) by means of a bolted connection, and on the other side it is connected to the elastic beam (30) and the casing (49) by means of a vertical hinge (15) containing a friction damper (29).

EFFECT: increased reliability and reduced mass of the coaxial bearing system, the possibility of folding the blades.

4 cl, 7 dwg