DRIVE SYSTEM OF COAXIAL ROTORS OF HELICOPTER WITH SUPPORT MAST Russian patent published in 2020 - IPC B64C27/12 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering, particularly, to helicopter rotor drive systems. Helicopter coaxial rotors drive system comprises reduction gear housing (1), drive input shaft (2), driven drive output shaft of lower rotors (3) and drive output shaft of drive of upper rotors (4), connected by kinematic gear transmission. Supporting mast (5) is installed inside reduction gear housing (1) coaxially with drive shafts of lower (3) and upper (4) rotors. Sleeve of upper rotor (6) is equipped with bearings (7) fixed on support mast (5). Drive shaft of upper rotor (4) is installed inside supporting mast (5) and is equipped with flange (8). Drive shaft of lower rotor (3) is installed between support mast (5) and housing of reduction gear (1). Lower rotor (10) bushing is equipped with bearings (12) fixed outside on reduction gear housing (1). Thrust bearing (13) of drive shaft of lower rotors (3) is fixed on support mast (5). Flange (8) is equipped with an additional thrust bearing (14) fixed on supporting mast (5). Supporting mast (5) is fixed to power units (15) of helicopter.

EFFECT: higher reliability and resource of loaded units of drive system, higher resistance to occurrence of vibrations and undesirable self-oscillations of helicopter.

1 cl, 2 dwg