Rear nacelle assembly for a turbojet engine

Patent metadata

Field	Value
Publication number	US-10036323-B2
Application number	US-201414200365-A
Country	US
Kind code	B2
Filing date	Mar 7, 2014
Priority date	Sep 16, 2011
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A rear nacelle assembly for turbojet engine includes an inner structure surrounding a downstream portion of the turbojet engine. In particular, the inner structure is movable in rotation between an operating position in which it forms a downstream fairing and defines an annular stream of cold air with a thrust reverser cowl, and a maintenance position in which the inner structure moves away from the downstream portion. A suspension pylon is further provided to mount the thrust reverser cowl and the inner structure. The thrust reverser cowl slides between an opening position clearing air flow deviation grids and a closing position recovering the air flow deviation grids. Moreover, the thrust reverser cowl is mounted on the suspension pylon by a pivot connection sliding around a main axis, and the inner structure is mounted on the suspension pylon by a pivot connection around the main axis.

First claim

What is claimed is:

1. A rear assembly for a nacelle of a turbojet engine, comprising:
an inner structure surrounding a downstream portion of the turbojet engine, said inner structure being movable in rotation between an operating position in which the inner structure forms a downstream fairing of the turbojet engine and defines an annular stream of cold air with a thrust reverser cowl, and a maintenance position in which the inner structure moves away from the downstream portion of the turbojet engine; and
a suspension pylon whereon are mounted said thrust reverser cowl and said inner structure,
wherein said thrust reverser cowl, concentric to said inner structure, slides between an opening position clearing air flow deviation grids and a closing position re-covering said air flow deviation grids,
said thrust reverser cowl further being mobile in rotation between an operating position where the thrust reverser cowl defines the annular cold air stream with said inner structure, and a maintenance position where the thrust reverser cowl moves away from the downstream portion of the turbojet engine,
wherein the thrust reverser cowl and the inner structure are slidably and pivotably connected to the suspension pylon by a pivot connection, wherein the suspension pylon defines an elongated cutout extending along a main axis of the suspension pylon and recessed from an outer surface at a mounting location of the thrust reverser cowl and the inner structure for slidably receiving the pivot connection therein such that the pivot connection is directly embedded into the suspension pylon.

2. The rear assembly according to claim 1 , wherein the rear assembly comprises a system for guiding in translation and in rotation the thrust reverser cowl comprising at least one rail capable of sliding in a guide, the at least one rail being mounted on said thrust reverser cowl and the guide being directly or indirectly mounted on the suspension pylon, wherein the rail and the guide form the pivot connection.

3. The rear assembly according to claim 2 , wherein the guide or the at least one rail is preserved on a section fastened to the suspension pylon forming a base of the suspension pylon or on the suspension pylon.

4. The rear assembly according to claim 2 , wherein the main axis is a guide longitudinal axis.

5. The rear assembly according to claim 2 , wherein the rear assembly comprises a system for guiding in rotation an inner structure comprising the pivot connection, connecting the inner structure to the guide of the guiding system in translation and in rotation of the thrust reverser cowl, the inner structure being able to be opened towards its maintenance position by swiveling around said guide.

6. The rear assembly according to claim 5 , wherein the pivot connection of the inner structure comprises at least one hook, each guide configured such as to house the at least one hook and prevent translation of the at least one hook along a corresponding guide.

7. The rear assembly according to claim 5 , wherein the system for guiding in rotation the inner structure further comprises wedges for blocking the inner structure, the wedges being mounted on the suspension pylon.

8. The rear assembly according to claim 2 , wherein the rear assembly comprises a swivel device to swivel simultaneously the inner structure and the thrust reverser cowl outward around said guide when the thrust reverser cowl has reached an intermediary position between its closing and opening position.

9. The rear assembly according to claim 2 , wherein a retainer rod supports each rail and connects the rail to a longitudinal frame formed between inner and outer portions of the thrust reverser cowl, the retainer rod capable of being straight or bent.

10. The rear assembly according to claim 2 , wherein the thrust reverser cowl and the inner structure are formed respectively of half cowls and semi-cylindrical half portions, movements of the half cowls and half portions on either side of the suspension pylon are symmetrical with respect to a longitudinal median plane of the nacelle, and the main axis, on either side of the suspension pylon, being parallel to the median plane.

11. The rear assembly according to claim 10 , wherein the rear assembly further comprises a rail/guide guiding system in lower portion of the nacelle, connecting each half portion and the corresponding half cowl.

12. The rear assembly according to claim 10 , wherein the grids for deviating the air flow being mounted on each half cowl, each half cowl, the corresponding deviation grids and the half portion of the inner structure are secured in rotation.

13. The rear assembly according to claim 10 , wherein the rear assembly further comprises actuators for actuating the thrust reverser cowl comprising two actuators arranged in the upper portion of the cowl on either side of the suspension pylon, in the extension of the guiding rails.

14. The rear assembly according to claim 13 , further comprising an actuator arranged in the lower portion of the cowl, housed in a connecting block connecting each half portion of the inner structure to the corresponding half cowl.

15. The rear assembly according to claim 14 , wherein said lower actuator is born by one of the two half portions of the inner structure.

16. The rear assembly according to claim 2 , wherein the thrust reverser cowl comprises a guiding device for guiding in translation the grids for deviating the air flow.

17. The rear assembly according to claim 2 , wherein the rear assembly further comprises an anti-jamming device of the rails in the corresponding guides.

18. The rear assembly according to claim 17 , wherein said anti-jamming device comprises a gutter housed in the corresponding guide, wherein the rail is placed, said gutter being moveable in rotation around a longitudinal axis of a slide and blocked in translation in the guide.

19. A nacelle comprising the rear assembly according to claim 1 positioned at the rear of the nacelle.

20. The nacelle according to claim 19 , further comprising a fan casing wherein an air flow deviation edge is preserved in its downstream end.

Assignees

• Aircelle Sa

Inventors

• Hurlin Herve
• Dezeustre Nicolas
• Kerbler Olivier

Classifications

• B64D29/08

  Inspection panels for power plants · CPC title

• F02C7/20 Primary

  Mounting or supporting of plant; Accommodating heat expansion or creep · CPC title

• F02K1/72

  the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow · CPC title

• B64D29/06

  Attaching of nacelles, fairings or cowlings · CPC title

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title