MAIN ROTOR FOR CO-AXIAL CONFIGURATION HELICOPTER Russian patent published in 2005 - IPC

FIELD: aeronautical engineering; main rotors of co-axial configuration helicopters.

SUBSTANCE: proposed main rotor has upper main rotor with hub, V-shaped torsion bars connected with hub and with blade attachment adapters through drag hinges and casings made from composite materials and located around torsion bars. Secured at one end of each casing are blade angle control lever and spherical bearing fitted on pin secured on hub; other end of casing is connected through drag hinge to torsion bar and to blade attachment adapter. Main rotor is also provided with elastic member located in casing along axis of sleeve between blade attachment adapter and blade angle control lever; split end of elastic member is rigidly connected with ears of blade adapter and opposite end is inserted into guides on blade angle control lever. Elastic member of lower rotor has flexural rigidity in plane of rotation determined by relationship making it possible to minimize moments in plane of rotation in drag hinge of lower rotor.

EFFECT: enhanced reliability of main rotor.

2 dwg