System of compact contra-rotating propellers

Details System of compact contra-rotating propellers System of compact contra-rotating propellers

F - Mech Eng,Light,Heat,Weapons

02

C

F02C 3/067 (2006.01) F02C 7/36 (2006.01) F02K 3/072 (2006.01)

Patent

CA 2752214

The present invention relates to a system of contra-rotating propellers (30) for an aircraft jet engine, including: - a free power turbine (32); - a first propeller (7) and a second propeller (9), contra-rotating, the former being placed in a predetermined direction relative to the latter, each one including a hub (48a, 48b), an outer ferrule (56a, 56b), as well as coupling arms (60a, 60b) linking the two; and - a casing (42) inserted between the free turbine (32) and the propellers, the latter being arranged in the predetermined direction relative to the casing and the turbine being arranged in the opposite direction relative to said same casing, the latter having a casing extension (46) in the given direction, rotatably supporting the hub (48b) of the propeller (9). According to the invention, the coupling arms (60b) extend in said opposite direction, radially towards the outside.

La présente invention se rapporte à un système d'hélices contrarotatives (30) pour turbomachine d'aéronef, comprenant : - une turbine libre de puissance (32); - une première hélice (7) et une seconde hélice (9) contrarotatives, la première étant située dans une direction donnée par rapport à la seconde, chacune comprenant un moyeu (48a, 48b), une virole extérieure (56a, 56b), ainsi que des bras de raccord (60a, 60b) reliant les deux; et - un carter (42) interposé entre la turbine libre (32) et les hélices, ces dernières étant agencées dans la direction donnée par rapport au carter et la turbine étant agencée dans la direction opposée par rapport à ce même carter, celui-ci présentant une extension de carter (46) dans la direction donnée, supportant en rotation le moyeu (48b) de l'hélice (9). Selon l'invention, les bras de raccord (60b) s'étendent dans ladite direction opposée en allant radialement vers l'extérieur.

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