Variable-pitch vane

Patent metadata

Field	Value
Publication number	US-2016017728-A1
Application number	US-201414771787-A
Country	US
Kind code	A1
Filing date	Feb 27, 2014
Priority date	Mar 1, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

A variable-pitch vane comprising: a plurality of propeller blades ( 2 ), each being of variable pitch according to a blade rotational axis (A 1 ) and each having a root ( 201 ), a plurality of rotor connecting shafts ( 6 ), each shaft having a foot ( 602 ) and a head ( 601 ). the root ( 201 ) of each blade being mounted on the head ( 601 ) of a rotor connecting shaft via a pivot ( 8 ) in such a way as to allow each blade ( 2 ) to rotate according to the blade rotational axis (A 1 ), in which each blade ( 2 ) has a blade pitch, such that the blade rotational axis (A-i) of same is inclined relative to a radial axis (A 2 ) passing through the foot ( 602 ) of the corresponding shaft.

First claim

1 . Variable-pitch blading including:
a plurality of propeller blades, each with variable pitch about a blade axis of rotation (A 1 ) and each having a root, a plurality of rotor connecting shafts, each shaft having a root and a head, the root of each blade being assembled on the head of a rotor connecting shaft via a pivot so as to allow rotation of each blade about the blade axis of rotation (A 1 ), wherein each blade has a blade inclination such that its blade axis of rotation (A 1 ) is inclined with respect to a radial axis (A 2 ) running through the root of the corresponding shaft, and in that the inclination of the blade includes a tangent inclination component (β) in the plane of the propeller.

2 . The blading according to claim 1 , wherein the tangential inclination angle toward the extrados is comprised between 5 and 15°.

3 . The blading according to claim 1 , wherein the blade inclination includes an upstream or downstream inclination component with respect to the plane of the propeller.

4 . The blading according to claim 3 , wherein the upstream angle of inclination is comprised between 0 and 2°.

5 . The blading according to claim 1 , wherein each shaft is inclined with respect to the radial axis (A 2 ), inclining the corresponding blade by the blade inclination.

6 . The blading according to claim 1 , wherein each shaft has an articulation inclining the head of the shaft with respect to the rest of the shaft, and thus inclining the corresponding blade by the blade inclination.

7 . The blading according to claim 6 , wherein the articulation includes a bellows.

8 . The blading according to claim 6 , wherein the articulation includes a universal joint.

9 . A turbomachine including a blading according to claim 1 .

10 . A turbomachine including two counter-rotating blading, each according to claim 1 .

Assignees

• Snecma

Inventors

• Fabre Adrien
• Laurenceau Adrien

Classifications

• F01D5/02

  Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28}) · CPC title

• F05D2240/30

  Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor · CPC title

• B64C11/36

  non-automatic · CPC title

• B64D2027/005

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

• F05D2220/30

  in turbines · CPC title