Propeller blade pivot

Patent metadata

Field	Value
Publication number	US-9896189-B2
Application number	US-201414279727-A
Country	US
Kind code	B2
Filing date	May 16, 2014
Priority date	May 17, 2013
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The invention relates to the field of aerial propellers, in particular the field of variable-pitch propellers, specifically for unducted fans. More specifically, the invention relates to a pivot ( 15 ) for a blade ( 14 ) of a propeller ( 3 a, 3 b ), the pivot including at least a proximal portion ( 15 a ) made of metal and suitable for being retained in a radial orifice of a propeller hub, while being capable of turning in said orifice about a longitudinal axis (Z) of the pivot ( 15 ), and a distal portion ( 15 b ) including a receptacle ( 20 ) suitable for retaining a blade root, and at least one arm ( 17 ) of organic matrix composite material extending laterally relative to said longitudinal axis (Z) and supporting a flyweight ( 16 ).

First claim

The invention claimed is:

1. A pivot for a blade of a propeller, the pivot comprising:
a proximal portion suitable for being retained in a radial orifice in a propeller hub while being capable of turning in the orifice about a longitudinal axis of the pivot; and
a distal portion including at least one arm extending laterally relative to said longitudinal axis and supporting a flyweight at an end of said at least one arm furthest from said longitudinal axis;
wherein at least said proximal portion is made of metal, at least said at least one arm is made of organic matrix composite material, and a receptacle for retaining a blade root is formed in a metal extension of the proximal portion of the pivot that passes through the distal portion of the pivot and presents a longitudinal section that diverges towards a distal end of the pivot to retain along the longitudinal axis, by interlocking shapes, the distal portion of the pivot.

2. The pivot according to claim 1 , wherein said proximal and distal portions are bonded together by adhesive.

3. The pivot according to claim 1 , wherein said proximal and distal portions are bonded together by a bolted connection.

4. The pivot according to claim 1 , wherein said receptacle is in the form of a dovetail slot extending in a direction that is substantially perpendicular to said at least one arm.

5. The pivot according to claim 1 , wherein said distal portion comprises two opposite arms extending laterally relative to said longitudinal axis and each supporting a respective flyweight.

Assignees

• Snecma

Inventors

• Tajan Sebastien
• Fabre Adrien Jacques Philippe
• Jacquemard Christophe
• Laurenceau Adrien
• Boudier Romain

Classifications

• B64C11/325 Primary

  comprising feathering, braking or stopping systems · CPC title

• B64C11/346 Primary

  actuated by the centrifugal force or the aerodynamic drag acting on auxiliary masses or surfaces · CPC title

• F01D7/00

  Rotors with blades adjustable in operation; Control thereof (for reversing F01D1/30) · CPC title

• B64D2027/005

  Aircraft with an unducted turbofan comprising contra-rotating rotors, e.g. contra-rotating open rotors [CROR] · CPC title

• F01D7/02

  having adjustment responsive to speed · CPC title