WO2009147342A2 - Mat d'accrochage de moteur d'aeronef comprenant un caisson de section en forme de cercle ou d'ellipse - Google Patents
Mat d'accrochage de moteur d'aeronef comprenant un caisson de section en forme de cercle ou d'ellipse Download PDFInfo
- Publication number
- WO2009147342A2 WO2009147342A2 PCT/FR2009/050861 FR2009050861W WO2009147342A2 WO 2009147342 A2 WO2009147342 A2 WO 2009147342A2 FR 2009050861 W FR2009050861 W FR 2009050861W WO 2009147342 A2 WO2009147342 A2 WO 2009147342A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- section
- mast
- box
- engine
- aircraft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/02—Aircraft characterised by the type or position of power plants
- B64D27/16—Aircraft characterised by the type or position of power plants of jet type
- B64D27/18—Aircraft characterised by the type or position of power plants of jet type within, or attached to, wings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/40—Arrangements for mounting power plants in aircraft
- B64D27/402—Arrangements for mounting power plants in aircraft comprising box like supporting frames, e.g. pylons or arrangements for embracing the power plant
Definitions
- the present invention relates generally to an aircraft engine attachment pylon, such as a turbojet engine.
- This type of attachment mast also called “EMS" (of the English “Engine Mounting Structure"), allows for example to suspend the turbojet below the wing of the aircraft, via a mounting system comprising a plurality of engine attachments.
- Such a rigging mast is in fact provided to form the connecting interface between an engine such as a turbojet and a wing of the aircraft. It makes it possible to transmit to the structure of this aircraft the forces generated by its associated turbojet, and also authorizes the routing of fuel, electrical, hydraulic and air systems between the engine and the aircraft.
- the mast comprises a rigid structure, also called primary structure, often of the "box" type, formed by the assembly of upper and lower spars and two side panels, preferably via fastening means of the bolts type, connecting them to transverse ribs arranged in an interior chamber space. In cross section, this box therefore usually has a square or rectangular shape.
- the disadvantage of such a solution lies in the difficulty of obtaining a satisfactory compromise between a dimensioning of the box sufficiently small to limit the drag generated within the secondary flow in which it is immersed, and a sizing box sufficiently large to ensure the transmission of forces from the engine to the fuselage of the aircraft.
- the object of the invention is therefore to propose an aircraft engine attachment pylon which at least partially overcomes the disadvantage mentioned above relating to the embodiments of the prior art, and also to present an engine assembly for an aircraft having at least one such mast.
- the subject of the invention is an aircraft engine attachment pylon, said mast comprising a rigid structure provided with a box formed using one or more hollow sections.
- at least one hollow section has a section in the form of an ellipse or a circle.
- the invention proposes a radically different design than that usually adopted for rigid rigging mast structures, since it is now provided with a rounded shape, and more specifically with a circular or elliptical section.
- This form was chosen for the weak it provides, as well as for the very good mechanical properties it has, due in particular to a high inertia module in the three main directions orthogonal to each other, these three main directions corresponding to the main modes of stress that are vertical bending, lateral bending and torsion. Therefore, this original solution advantageously allows to offer a satisfactory compromise between a dimensioning of the box sufficiently small to limit the drag generated in the secondary flow in which this box is immersed, and a box dimensioning large enough to ensure the transmission of efforts from the engine to the fuselage of the aircraft.
- At least one hollow section is substantially frustoconical in shape or substantially cylindrical in shape, of elliptical or circle-shaped cross section. This type of section could naturally be provided in combination with another section of any section.
- the mast comprises a plurality of hollow sections interconnected at their front and rear ends.
- at least one hollow section has at least one of its front and rear ends in the form of a fastening flange projecting outwardly with respect to an interior chamber space.
- this flange is preferably intended to be connected to a flange substantially similar, arranged next to the directly consecutive section of the box.
- the selected design no longer requires access to the interior of the box to ensure the establishment of said fastening means, the portions to be assembled in fact arranged outwardly with respect to the interior space of the box.
- the assembly time is therefore advantageously reduced, in particular because of the ease of intervention offered to the operator performing such a task.
- the box is preferably devoid of internal ribs, even if such ribs can be provided, without departing from the scope of the invention.
- it can conventionally be implemented ribs front and rear closure of the box, respectively disposed at the opposite longitudinal ends of the box, thus remaining easily accessible to the operator ensuring their attachment.
- said fixing means are bolts or rivets.
- the mast comprises a front hollow section of substantially frustoconical shape and of circular cross section, and a central hollow section carrying said front section, the central hollow section being substantially cylindrical shaped section in shape. of ellipse, of axis inclined and secant with respect to the axis of said front section.
- This configuration facilitates the junction between the two sections.
- it provides an elliptical section for the main section, and thus to orient the major axis of the ellipse in the direction of maximum stress experienced by the box, usually the direction of height.
- said interior space may take the form of a duct for the passage of compressed air, preferably taken from the engine and intended to feed the interior of the aircraft, for example for the purpose of pressurizing the latter.
- a compressed air duct could travel through the inner chamber space.
- the invention also relates to an engine assembly for an aircraft comprising a motor and a motor attachment pylon such as that which has just been presented. Finally, the invention also relates to an aircraft comprising at least one such engine assembly.
- Figure 1 shows a schematic side view of an engine assembly for aircraft, according to a preferred embodiment of the present invention
- Figure 2 shows a perspective view of the rigid structure of the attachment pylon of the engine assembly shown in Figure 1;
- FIG. 3 shows a longitudinal sectional view of the rigid structure of the attachment mast shown in Figure 2;
- FIGS. 4a to 4c are sectional views taken along the lines IVa-IVa to IVc-IVc of FIG. 3, respectively;
- FIG. 5 represents a view similar to that shown in FIG. 3, the rigid structure being in the form of another preferred embodiment of the present invention; and Figures 6a to 6c are sectional views taken along lines VIa-VIa to VIc-VIc of Figure 5, respectively.
- a motor unit 1 for an aircraft intended to be fixed under a wing 3 of this aircraft is shown, this assembly 1, provided with an attachment pylon 4, in the form of a mode preferred embodiment of the present invention.
- the engine assembly 1 comprises a motor such as a turbojet engine 2 and the attachment pylon 4, the latter being in particular provided with a rigid structure 10 and a mounting system 11 composed of a plurality of engine fasteners 6, 8 and a device for taking up the thrust forces 9 generated by the turbojet engine 2, the mounting system 11 thus being interposed between the engine and the aforementioned rigid structure 10, also referred to as the primary structure.
- the assembly 1 is intended to be surrounded by a nacelle (not shown), and that the attachment mast 4 comprises another series of fasteners 13 to ensure the suspension of this 1 together under the wing of the aircraft, being connected to a front spar (not shown) of this wing.
- X is the longitudinal direction of the mast 4 which is also comparable to the longitudinal direction of the turbojet engine 2, this direction X being parallel to a longitudinal axis 5 of the turbojet engine 2.
- Y direction oriented transversely to the mast 4 and also comparable to the transverse direction of the turbojet 2, and Z the vertical direction or height, these three directions X, Y and Z being orthogonal to each other.
- front and rear are to be considered in relation to a direction of advancement of the aircraft encountered following the thrust exerted by the turbojet engine 2, this direction being represented schematically by the arrow 7.
- the turbojet engine 2 has at the front of a large fan casing 12 delimiting an annular fan duct 14, and has a rear casing 16 of smaller dimension, enclosing the heart of this turbojet engine. Finally, the central casing 16 is extended towards the rear by an ejection casing 17 of larger size than that of the casing 16.
- the housings 12, 16 and 17 are of course integral with each other.
- the plurality of engine attachments is constituted by a front engine attachment 6 and a rear engine attachment 8 possibly forming two rear half-fasteners as is known from the prior art.
- the recovery device 9 comprises in particular two lateral rods for taking up the thrust forces (only one being visible in FIG.
- the front engine attachment 6, secured to the fan casing 12, is conventionally designed so as to take only forces generated by the turbojet engine 2 in the directions Y and Z, and therefore not those being exerted in the direction X.
- this front attachment 6 preferably penetrates into an upper circumferential end portion of the fan casing 12.
- the rear engine attachment 8 is generally interposed between the ejection housing 17 and the rigid structure 10 of the mast. As indicated above, it is preferably designed so as to be able to take up forces generated by the turbojet engine 2 along directions Y and Z, but not those exerted in direction X.
- the recovery of the forces exerted in the direction X is carried out at the aid of the device 9, and the recovery of the forces exerted in the directions Y and Z is carried out jointly with the aid of the front attachment 6 and the rear attachment 8.
- the recovery the moment of exerting in the direction X is carried out vertically with the aid of the fastener 8
- the recovery of the moment exerted in the direction Y is carried out vertically with the aid of the rear fastener 8 jointly with the fastener 6
- the recovery of the moment being exerted in the direction Z is carried out transversely with the aid of the fastener 8, together with the fastener 6.
- the rigid structure 10 of the attachment pylon also called primary structure. It consists generally of a box 24 extending from one end to the other of the rigid structure 10, in the X direction, and thus forms a torsion box.
- the box is formed using several hollow sections, here three adjacent sections 28, 30, 32.
- the first 28 is of substantially frustoconical shape, with axis 28a corresponding to the axis of revolution. Its front end is preferably intended to carry the front engine attachment 6.
- the section orthogonal to the axis 28a takes the form of a circle, as shown in Figure 4a. Thus, the size of this circle decreases going forward, because of the narrowing of the frustoconical section in this direction.
- the second hollow section 30, said central section is in turn substantially cylindrical, axis 30a preferably coincides with the axis 28a. Its front end, attached to the rear end of the first section 28, is preferably intended to carry the rear engine attachment 8.
- the section orthogonal to the axis 30a takes the form of a circle, as shown on Figure 4b.
- the diameter near the front end of the second section 30 is substantially identical to that of the first section 28, near its end. back .
- the third section 32 is of substantially frustoconical shape, axis 32a identical to the axes 28a and 30a, and thus also corresponding to the axis of revolution.
- the section orthogonal to the axis 32a takes the form of a circle, as shown in Figure 4c.
- the size of this circle decreases going backwards, because of the narrowing of the frustoconical section in this direction, which fits perfectly to the narrowing of the mast in this rear part.
- the diameter near the rear end of the second section 30 is substantially identical to that of the third section 32, near its end. before.
- coaxial sections have been described as having a constant or evolutive circular section, namely of revolution, an elliptical section remains possible, without departing from the scope of the invention, even for substantially frustoconical sections.
- the sections may not be coaxial, while preferably remaining intersecting axes, this depending on the needs encountered.
- Each of the sections may be made of composite material, for example by the winding-composite technique, or vacuum injection molding (English “Resin Transfer Molding”).
- the outer surface of the box 24 thus serves as a housing for the implementation of conventional systems on the mast, such as hydraulic and / or electrical systems.
- the box constituting the rigid structure 10 may have, incidentally, a transverse closing rib before 34a of the box, and a transverse rear closure rib 34b of the box.
- these each have their front and / or rear ends in the form of a fixing flange projecting outwardly with respect to an interior space of box 38.
- these coaxial circular flanges 40 centered on the axes of the sections are therefore in contact and in contact two by two, and project radially outwardly of the sections.
- the flanged rear end 40 of the front section 28 is fixed to the flange-shaped front end 40 of the central section 30, as well as the flanged rear end 40 of the central section 30 is fixed to the flange-shaped front end 40 of the rear section 32.
- the fastening means used to make such assemblies are bolts 42, rivets or the like, arranged externally with respect to the interior space of box 38, preferably being oriented in the direction X.
- the rigid structure 10 of the attachment pylon is also generally composed of a box 24 extending from one end to the other of the rigid structure 10, in the X direction, thus forming a torsion box.
- This box is formed using several hollow sections, here three adjacent sections 28, 30, 32.
- the first 28 is of substantially frustoconical shape, with axis 28a corresponding to the axis of revolution. Its front end is preferably intended to carry the front engine attachment 6.
- the section orthogonal to the axis 28a takes the form of a circle, as shown in Figure 6a. Thus, the size of this circle decreases going forward, because of the narrowing of the frustoconical section in this direction.
- the second hollow section 30, said central section is in turn substantially cylindrical, axis 30a, inclined and secant with respect to the axis 28a. More specifically, it is the axis 30a of the central section which is substantially parallel to the X direction, the axis 28a being inclined to it to approach the motor axis 5 while going forward. Whatever it is or, the two intersecting axes 28a, 30a are preferably arranged in a vertical imaginary median plane XZ of the mast.
- the front end of this central section, fixed to the rear end of the first section 28, is preferably intended to carry the rear engine attachment 8.
- the section orthogonal to the axis 30a takes the form of an ellipse, such as that this is shown in Figure 6b.
- the ellipse has its major axis in the vertical direction, in which the section thus offers a very important module of inertia. This is advantageous in that it is in this same vertical direction that the mast is the most mechanically stressed during the recovery of the drive forces.
- the rear end of the section 28 is arranged in a plane 50 inclined relative to the plane 52 orthogonal to the axis 28a, so that to have an elliptical section substantially identical to that of the second section 30.
- the plane 50 concerned is substantially orthogonal to the axis 30a of the main section 30, and also corresponds to the plane in which is also arranged l the front end of the main section 30.
- the third section 32 is substantially frustoconical in shape, axis 32a identical to the axis 30a, and also forming axis of revolution.
- the section orthogonal to the axis 32a takes the form of an ellipse, as shown in FIG.
- the size of this ellipse decreases in going backwards, because of the narrowing of the section frustoconical in this direction, which adapts perfectly to the narrowing of the mast in this rear part.
- the elliptical section of the second section 30 is substantially identical to that of the third section 32, near its front end.
- the sections are of course interconnected by means of the fixing means 42 described above, passing through the flanges 40 in contact and in contact two by two, and arranged outside the space 38.
- this interior space 38 forms a duct for the passage of compressed air taken from the engine, and intended to supply the aircraft.
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Clamps And Clips (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009801169014A CN102026871B (zh) | 2008-05-14 | 2009-05-12 | 包括具有圆形或椭圆形截面的箱体的用于飞行器发动机的悬挂架 |
| US12/989,589 US8517305B2 (en) | 2008-05-14 | 2009-05-12 | Aircraft engine attachment pylon comprising a box with a circular or elliptical shaped section |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0853116A FR2931134B1 (fr) | 2008-05-14 | 2008-05-14 | Mat d'accrochage de moteur d'aeronef comprenant un caisson de section en forme de cercle ou d'ellipse |
| FR0853116 | 2008-05-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2009147342A2 true WO2009147342A2 (fr) | 2009-12-10 |
| WO2009147342A3 WO2009147342A3 (fr) | 2010-02-18 |
Family
ID=39967306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2009/050861 Ceased WO2009147342A2 (fr) | 2008-05-14 | 2009-05-12 | Mat d'accrochage de moteur d'aeronef comprenant un caisson de section en forme de cercle ou d'ellipse |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8517305B2 (fr) |
| CN (1) | CN102026871B (fr) |
| FR (1) | FR2931134B1 (fr) |
| WO (1) | WO2009147342A2 (fr) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2965547B1 (fr) * | 2010-10-01 | 2012-10-19 | Airbus Operations Sas | Structure rigide de mat d'accrochage d'un moteur d'aeronef comprenant un caisson en materiau composite renforce par des nervures transversales exterieures |
| FR2977567B1 (fr) | 2011-07-07 | 2014-12-26 | Airbus Operations Sas | Procede de refroidissement d'un plancher de protection thermique d'un carenage aerodynamique arriere d'un mat d'accrochage d'un ensemble propulsif d'aeronef |
| FR2988688B1 (fr) * | 2012-03-27 | 2014-05-09 | Airbus Operations Sas | Carenage aerodynamique arriere a tenue en temperature amelioree pour mat d'accrochage d'ensemble propulsif d'aeronef |
| FR3004420B1 (fr) * | 2013-04-15 | 2015-04-10 | Snecma | Berceau de suspension d'un turbopropulseur |
| US10266273B2 (en) | 2013-07-26 | 2019-04-23 | Mra Systems, Llc | Aircraft engine pylon |
| FR3061148B1 (fr) * | 2016-12-23 | 2022-08-12 | Airbus Operations Sas | Fixation semi-continue d'un mat d'accrochage de moteur a un dispositif de fixation appartenant a la voilure d'un aeronef |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4055041A (en) * | 1974-11-08 | 1977-10-25 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Integrated gas turbine engine-nacelle |
| US4266741A (en) | 1978-05-22 | 1981-05-12 | The Boeing Company | Mounting apparatus for fan jet engine having mixed flow nozzle installation |
| US5347884A (en) * | 1993-03-08 | 1994-09-20 | Moog Inc. | Method and apparatus for cancellation of rotational unbalance |
| US5524847A (en) * | 1993-09-07 | 1996-06-11 | United Technologies Corporation | Nacelle and mounting arrangement for an aircraft engine |
| FR2873987B1 (fr) * | 2004-08-05 | 2006-11-24 | Airbus France Sas | Ensemble moteur pour aeronef |
| FR2873988B1 (fr) * | 2004-08-05 | 2007-12-21 | Airbus France Sas | Mat d'accrochage de turboreacteur pour aeronef |
| FR2885877B1 (fr) * | 2005-05-23 | 2008-12-12 | Airbus France Sas | Mat d'accrochage de turboreacteur pour aeronef |
| FR2891803B1 (fr) * | 2005-10-07 | 2007-11-30 | Airbus France Sas | Structure rigide pour mat d'accrochage de moteur d'aeronef, et mat comportant une telle structure |
| FR2920408B1 (fr) * | 2007-08-30 | 2010-02-19 | Snecma | Pylone de suspension d'un moteur sous une aile d'avion |
| US8205825B2 (en) * | 2008-02-27 | 2012-06-26 | Spirit Aerosystems, Inc. | Engine pylon made from composite material |
| FR2931133B1 (fr) * | 2008-05-14 | 2010-06-18 | Airbus France | Mat d'accrochage de moteur comprenant des moyens de fixation des longerons et des panneaux agences en dehors de l'espace interieur de caisson |
-
2008
- 2008-05-14 FR FR0853116A patent/FR2931134B1/fr not_active Expired - Fee Related
-
2009
- 2009-05-12 US US12/989,589 patent/US8517305B2/en not_active Expired - Fee Related
- 2009-05-12 WO PCT/FR2009/050861 patent/WO2009147342A2/fr not_active Ceased
- 2009-05-12 CN CN2009801169014A patent/CN102026871B/zh not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2931134B1 (fr) | 2010-06-18 |
| CN102026871B (zh) | 2013-12-18 |
| US8517305B2 (en) | 2013-08-27 |
| WO2009147342A3 (fr) | 2010-02-18 |
| US20110036943A1 (en) | 2011-02-17 |
| FR2931134A1 (fr) | 2009-11-20 |
| CN102026871A (zh) | 2011-04-20 |
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