MAIN REDUCTION GEAR OF COAXIAL DRIVE CIRCUIT OF ROTORS OF LIGHT OR ULTRA-LIGHT HELICOPTER Russian patent published in 2024 - IPC B64C27/14 B64D35/06 F16H1/14 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering, particularly, to light helicopters. Main reduction gear of the coaxial drive circuit of rotors of a light or ultra-light helicopter comprises a housing in which a bevel gear drive shaft is mounted on bearings, with which two driven gears are engaged, two coaxially arranged hollow shafts, the end part of each of which in the housing cavity is connected to the corresponding driven gear. End parts of said shafts are installed in the housing on ball bearings, and the housing at the outlet of these shafts is made with a tubular guide. End of the internally located hollow shaft is installed in the bearing, which is fixed in the transversely located bracket on the side opposite to the side of the bevel gear drive shaft installation. Downstream driven bevel gear for drive of inner hollow shaft is made with hub developed along length fixed on this shaft, on one part of which there is a bearing fixed in housing. Upstream driven bevel gear for the drive of the external shaft is attached to the flange of this shaft above the bearing in the bracket.

EFFECT: provides an increase in the reliability and service life of the main reduction gear of the coaxial drive circuit of rotors of a small or ultra-small helicopter.

5 cl, 3 dwg