Patent ID: 9611809
Date: 2017-04-04
CPC Classifications: B64C,B64D,F02C,F02K,F05D,Y02T

Claim:
1. A contra-rotating propeller system for an aircraft turbine engine in which gases circulate from an upstream to a downstream of said turbine engine, comprising: a free power turbine including a first rotor and second contra-rotating rotor relative to the first rotor; first and second contra-rotating propellers to be rotated about a longitudinal axis of the propeller system relative to a stator of the system; and a mechanical transmission device including planetary gear train including: (i) a sun gear concentric with the longitudinal axis and driven by the first rotor of the free power turbine, (ii) planet gears meshing with the sun gear, (iii) a planet carrier driving the first propeller, and (iv) a ring gear meshing with each planet gear, the ring gear, driven by the second rotor, driving the second propeller, wherein the mechanical transmission device is arranged between the first propeller and the second propeller.