COAXIAL LIFTING SYSTEM Russian patent published in 2007 - IPC B64C27/10 B64C27/32 

FIELD: aeronautical engineering; manufacture of helicopters.

SUBSTANCE: proposed coaxial lifting system includes gearbox with two shafts rotating in opposite directions; main rotor hubs are mounted on these shafts. Two wobble plates which are connected together and are movable in axial direction are kinematically linked with guides of blades and with summing-up collective and differential pitch leverage system. Two-blade main rotor hubs have common flapping hinges. Guides of blades of lower rotor hub are connected with lower wobble plate through bell cranks mounted on slide block located under lower rotor hub. Guides of blades of upper rotor hub are connected directly with upper wobble plate by means of tie rods. Radii of guides on upper rotor hub exceed those on lower rotor hub. Lower wobble plate and slide block are connected with collective and differential pitch control system through summing-up leverage system whose one lever is connected by its arms with differential pitch control system and with slide block. Second lever which is articulated on first one is connected by its arms with collective pitch control system and with slide block of lower wobble plate.

EFFECT: enhanced reliability of system.

2 dwg