Unducted propeller gas turbine engine attachment structure

Patent metadata

Field	Value
Publication number	US-9522739-B2
Application number	US-201214128799-A
Country	US
Kind code	B2
Filing date	Jun 13, 2012
Priority date	Jun 23, 2011
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

An attachment structure for attaching a power plant including unducted propellers to a fuselage of an aircraft, the attachment structure being connected by first and second fasteners to respective front and rear spars penetrating into the fuselage and fastened to a carrier structure of the aircraft, and including a central longitudinal beam secured at its front end to a first frame, arranged in the plane of the front spar, that is secured at its rear end to a second rear frame, cantilevered out and arranged upstream from the unducted propellers, and that is secured to a third intermediate frame, arranged in the plane of the rear spar between the first and second frames. The first, second, and third frames are connected together by force-takeup beams, an assembly as constituted in this way forming a cradle for receiving the power plant via a standard attachment.

First claim

The invention claimed is:

1. An attachment structure for attaching a power plant including unducted propellers to a fuselage of an aircraft, the attachment structure being connected by a first and a second fastener means to a front spar and a rear spar, respectively, said front spar and said rear spar penetrating into the fuselage and fastened to a carrier structure of the aircraft, the attachment structure comprising:
a central longitudinal beam having a front end connected to a first front frame arranged in a first plane containing the front spar, the central longitudinal beam having a rear end connected to a second rear frame, said second rear frame being cantilevered out from said rear spar and arranged upstream from the unducted propellers, and the central longitudinal beam having a third intermediate frame arranged in a second plane containing the rear spar, the third intermediate frame being located longitudinally between the first front frame and the second rear frame, and
wherein the first front frame and the third intermediate frame are connected together by a first set of force-takeup beams and the third intermediate frame and the second rear frame are connected together by a second set of force-takeup beams,
an assembly of the central longitudinal beam and the first front frame, the second rear frame, and the third intermediate frame forming a cradle for receiving the power plant via a standard attachment means.

2. An attachment structure according to claim 1 , wherein the central longitudinal beam is of varying width, being wider at the front end and narrower at the rear end.

3. An attachment structure according to claim 1 , wherein the first fastener means comprises two conical projections arranged on either side of a midplane of the power plant.

4. An attachment structure according to claim 1 , wherein the second fastener means comprises a lug arranged in a midplane of the power plant.

5. An attachment structure according to claim 3 , wherein the conical projections include flexible pads for attenuating vibration of the power plant.

6. An attachment structure according to claim 4 , wherein the lug includes flexible pads for attenuating vibration of the power plant.

7. An attachment structure according to claim 1 , wherein the standard attachment means for attaching the power plant to the cradle comprises at least two suspension links fastened between the power plant and the first front frame on either side of a midplane of the power plant, and a plurality of flexible pads regularly distributed between the power plant and the second rear frame.

8. An attachment structure according to claim 1 , wherein the cradle presents an asymmetrical structure with said central longitudinal beam offset by a determined angle relative to a horizontal plane through a center of said power plant to compensate for an angle of inclination of the front and rear spars relative to the horizontal plane.

9. An aircraft comprising unducted propellers and at least one power plant attached to the aircraft fuselage by the attachment structure according to claim 1 .

10. An attachment structure for attaching a power plant including unducted propellers to a fuselage of an aircraft, the attachment structure being connected by at least two conical projections to a front spar and by a lug to a rear spar, said front spar and said rear spar penetrating into the fuselage and fastened to a carrier structure of the aircraft, the attachment structure comprising:
a central longitudinal beam having a front end connected to a first front frame arranged in a first plane containing the front spar, the central longitudinal beam having a rear end connected to a second rear frame, said second rear frame being cantilevered out from said rear spar and arranged upstream from the unducted propellers, and the central longitudinal beam having a third intermediate frame arranged in a second plane containing the rear spar, the third intermediate from being located longitudinally between the first front frame and the second rear frame, and
wherein the first front frame and the third intermediate frame are connected together by a first set of force-takeup beams and the third intermediate frame and the second rear frame are connected together by a second set of force-takeup beams,
an assembly of the central longitudinal beam and the first front frame, the second rear frame, and the third intermediate frame forming a cradle for receiving the power plant via at least two suspension links fastened between the power plant and the first front frame on either side of a midplane of the power plant, and a plurality of flexible pads regularly distributed between the power plant and the second rear frame.

Assignees

• Chouard Pierre-Alain Jean-Marie Philippe Hugues
• Vincent Thomas Alain Christian
• Snecma

Inventors

• Chouard Pierre-Alain Jean-Marie Philippe Hugues
• Vincent Thomas Alain Christian

Classifications

• B64D27/402

  comprising box like supporting frames, e.g. pylons or arrangements for embracing the power plant · CPC title

• B64D27/14 Primary

  within, or attached to, fuselages · CPC title

• B64D2027/262

  Operations & Transport · mapped topic

• B64D2027/264

  Operations & Transport · mapped topic

• Y02T50/66

  Cross-Sectional Technologies · mapped topic