HELICOPTER WITH COAXIAL MAIN ROTORS Russian patent published in 2005 - IPC

FIELD: aeronautical engineering; manufacture of light helicopters with coaxial main rotors.

SUBSTANCE: proposed helicopter has fuselage with crew cabin equipped with control units, gearbox with two coaxial shafts of opposite rotation; main rotor hubs are mounted on each shaft; helicopter is also provided with two wobble plates and two lever-type bell cranks for blade angle control which are kinematically linked with them, control circuits of main rotors including power cylinder unit and summing-up leverage mechanism equipped with two coaxial sleeves movable in axial direction. One sleeve is mounted on cylindrical part of upper housing of gearbox and second sleeve is mounted concentrically relative to first one. Mounted on surface of second sleeve is wobble plate of lower main rotor; lever-type bell crank kinematically linked with wobble plate is secured on upper projecting surface of first sleeve. Sleeves are articulated together by means of levers of summing-up mechanism which is rigidly mounted on gearbox housing. Inner shaft of gearbox is detachable; it is provided with upper main rotor hub, lever-type bell crank, upper wobble plate and rods for mutual kinematic linkage.

EFFECT: reduction of labor consumption in the course of servicing helicopter; reduced overall dimensions of helicopter in height.

3 dwg