Assembly for fixing beams comprising a support plate and two fittings welded together and to the support plate

Abstract

ASSEMBLY FOR FIXING BEAMS COMPRISING A SUPPORT PLATE AND FOUR BRACKETS ON BOTH SIDES OF THE SUPPORT PLATE. The invention relates to an assembly (100) for fixing beams (50) and comprising a support plate (102) having a first face (102a), and two first brackets (104a, 104b), each having a first base (106a) welded to the first face (102a), a first sleeve (110) for receiving, by insertion, one end of a beam (50), and a second base (106b) welded to the second base (106b) of the other first bracket (104b, 104a). With such an arrangement, the parts are lighter and various orientations are possible. Fig. 2

Description

Title of the invention: ASSEMBLY FOR FIXING BEAMS COMPRISING A SUPPORT PLATE AND TWO HARDWARE LOCKS WELDED TO EACH OTHER AND TO THE SUPPORT PLATE technical field

[0001] The present invention relates to the attachment of beams to a support plate and, more particularly, to an assembly providing such attachment. The present invention also relates to a chassis for an aircraft propulsion system where the chassis includes such a system, as well as to an aircraft comprising a propulsion system having such a chassis. PREVIOUS STATE OF THE ART

[0002] An aircraft conventionally comprises at least one propulsion assembly including an engine attached to a frame, more commonly called a mast, fixed to a wing structure of the aircraft. Such a frame takes, for example, the form of a cage, one embodiment of which is shown in [Fig. 3]. The frame 200 comprises a plurality of arches 302 or ribs, here five, arranged one after the other along a longitudinal direction of the aircraft, and between two successive arches 302, beams 304 or spars fixed at their ends to the two successive arches 302.

[0003] The beams 304 are fixed to each arch 302 by fittings attached to the arch 302, one embodiment of which is shown in [Fig. 4]. [Fig. 4] shows an arch 302 and two beams 304 fixed on either side of the arch 302 at the same fixing point by means of a first fitting 402a and a second fitting 402b. The arch 302 has a first surface 302a inscribed in a first plane and a second surface 302b inscribed in a second plane parallel to the first plane.

[0004] The first fitting 402a has a first base 404a which is fixed to the arch 302 by a plurality of fastening means 406a such as bolts. The first base 404a bears against the first surface 302a of the arch 302. Opposite the first surface 302a, the first fitting 402a has two sleeves 408a integral with the first base 404a, where each receives by insertion one end of a beam 304.

[0005] The second fitting 402b has a second base 404b which bears against the second surface 302b of the arch 302 which is opposite the first surface 302a. The second fitting 402b is fixed to the first fitting 402a by a screw 410 with a head and a threaded rod, where the threaded rod passes through the second fitting 402b and the arch 302, to screw into a tapped hole in the first fitting 402a, and where the head bears against a part of the second fitting 402b so as to sandwich the arch 302 between the first fitting 402a and the second fitting 402b. Opposite the second surface 302b, the second fitting 402b has two sleeves 408b integral with the second base 404b, where each receives by fitting one end of a beam 304.

[0006] The first fitting 402a also includes a centering stud 412 which fits into a bore of the second fitting 402b provided for this purpose.

[0007] Even if such an arrangement is satisfactory, the parts must be relatively large to achieve good rigidity despite the presence of the holes for the screw, and it is not possible to give the beams all possible orientations due to the presence of the screw. It is therefore desirable to find an arrangement that allows for smaller, and therefore lighter, parts with greater orientation possibilities. Description of the invention

[0008] An object of the present invention is to provide an assembly for fixing beams, where the parts constituting it are less heavy.

[0009] To this end, an assembly is proposed for fixing beams and comprising:

[0010] - a support plate having a first face, and

[0011] - two first fittings, each having a first base welded to the first face, a first sleeve intended to receive by fitting one end of a beam and a second base welded to the second base of the other first fitting.

[0012] With such an arrangement, the fittings are smaller in size and therefore lighter, and it is possible to arrange the beams perpendicular to the support plate.

[0013] Advantageously, the support plate has a second face opposite the first face, and said assembly comprises two second fittings, each having a first base welded to the second face, a second sleeve intended to receive by fitting one end of a beam and a second base welded to the second base of the other first fitting.

[0014] Advantageously, the first fittings and the second fittings are opposite each other.

[0015] Advantageously, each first base and each second base takes the form of a planar rectangle.

[0016] Advantageously, the assembly includes a transition zone between the flat rectangular bases and the cylindrical sleeve.

[0017] The invention also proposes a frame for fixing a propulsion assembly to a wing of an aircraft, said frame comprising a plurality of arches and a plurality of beams, where the beams are fixed to the arches using assemblies according to one of the preceding variants, where each arch constitutes a support plate and where each sleeve receives by fitting one end of a beam.

[0018] The invention also proposes an aircraft comprising a chassis according to the previous variant, a propulsion unit and a wing, where the propulsion unit is fixed to the chassis and where the chassis is fixed to the wing. Brief description of the drawings

[0019] The features of the invention mentioned above, as well as others, will become clearer upon reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which:

[0020] [Fig-1] is a side view of an aircraft comprising a propulsion assembly according to the invention,

[0021] [Fig.2] is a perspective view of an assembly according to the invention,

[0022] [Fig.3] is a perspective view of a chassis for an aircraft engine, and

[0023] [Fig.4] is a side view of a prior art assembly.

[0024] DETAILED STATEMENT OF IMPROVEMENTS

[0025] In the following description, terms relating to a position are taken with reference to an aircraft in a forward position, that is, as shown in [Fig.1], where arrow F shows the direction of forward movement of the aircraft.

[0026] In the following description, and by convention, X is called the longitudinal direction which corresponds to the axis of the aircraft oriented positively forward in the direction of advance of the aircraft, Y is called the transverse direction which is horizontal when the aircraft is on the ground, and Z is called the vertical direction or vertical height when the aircraft is on the ground, these three directions X, Y and Z being orthogonal to each other.

[0027] Fig. 1 shows an aircraft 10 which has a fuselage 22 on either side of which a wing 24 is fixed. Under each wing 24 is fixed at least one propulsion unit 151 which includes a nacelle 26 comprising cowlings 28 forming an aerodynamic outer surface.

[0028] The propulsion assembly 151 also includes an engine which is housed in the nacelle 26 and which here takes the form of a propeller engine, but which may be of another type.

[0029] The aircraft 10 also includes a frame (also called a mast) such as that shown in [Fig. 3]. As already described above, the frame 300 comprises structural elements connected to each other to form a cage, and the frame 300 here comprises a plurality of arches 302 arranged one after the other parallel to each other. to the longitudinal direction X and between two successive arches 302, and beams 304 fixed at their ends to the two successive arches 302. Of course, the frame 300, the arches 302, and the beams 304 can take other forms. Such a frame 300 constitutes a mast for attaching the propulsion unit 151 under the wing 24, where the propulsion unit 151 is fixed to the frame 300 and where the frame 300 is fixed to the wing 24.

[0030] Figure 2 shows the junction between a support plate 102 and beams 50 in the frame of an assembly 100 according to a first embodiment of the invention. Figure 3 shows this assembly 100 according to the invention.

[0031] Assembly 100 is described more specifically in the case of a chassis for mounting an aircraft engine, but it can be used in other applications where its beams need to be fixed to a support plate, for example, in a generally perpendicular manner. Thus, the support plate 102 can be an arch or another flat element.

[0032] The assembly 100 is therefore intended for fixing the beams 50, which are here four in number, but depending on the space, and in particular the diameters of the beams 50, it is possible to have more or fewer, and in particular, there may be two on one side of the support plate 102.

[0033] The assembly 100 thus comprises the support plate 102 which has two parallel faces with a first face 102a and a second face 102b opposite to the first face 102a.

[0034] In a particular embodiment where there are beams 50 on one side of the support plate 102, the assembly 100 comprises two first fittings 104a and 104b. Each first fitting 104a, 104b has a first base 106a welded to the first face 102a and a second base 106b welded to the second base 106b of the other first fitting 104b, 104a.

[0035] Each first fitting 104a, 104b further has a first sleeve 110 which receives by fitting one end of a beam 50. Each first sleeve 110 is integral with the first base 106a and the second base 106b of the first fitting 104a, 104b.

[0036] By eliminating the screw from the prior art, the fittings are smaller and therefore lighter. Furthermore, since the position of the sleeves is no longer dictated by the screw, there is greater freedom in positioning. In addition, the double welded fastening between the support plate 102 and the two fittings 104a-b ensures high strength. By separating the sleeves, it is possible to adjust the position and orientation of each one independently.

[0037] In the particular embodiment of [Fig. 2], the assembly 100 comprises two second fittings 112a and 112b and, as before, each has a first base (not seen) welded to the second face 102b and a second base 114b welded to the second base 114b of the other first fitting 112b, 112a.

[0038] Each second fitting 112a, 112b also has a second sleeve 118 which receives by fitting one end of a beam 50. Each second sleeve 118 is integral with the first base and the second base 114b of the second fitting 112a, 112b.

[0039] In the embodiment of the invention shown in [Fig.2], the first fittings 104a and 104b and the second fittings 112a and 112b are opposite each other on either side of the support plate 102 and here at the level of an overthickness 102c of the support plate 102.

[0040] To facilitate the various welding operations, each first base 106a and each second base 106b, 114b are shaped like a flat rectangle which is applied respectively against the corresponding face 102a, 102b of the support plate 102 or against the flat rectangle of the second base 106b, 114b of the other fitting. There is therefore a transition zone 120 between the flat rectangular bases 106a, 106b, 114b and the cylindrical sleeve 110.

[0041] The welded fixings are made for example by TIG welding.

[0042] In the case of a chassis 300 for attaching the propulsion assembly 151 to the wing 24, the chassis 300 thus comprises a plurality of arches 302 and a plurality of beams 304, where the beams 304 are fixed to the arches 302 by means of assemblies 100 as described above, where each arch 302 constitutes a support plate 102 and where each sleeve 110 receives by fitting one end of a beam 304.

Claims

Demands

1. Assembly (100) intended for fixing beams (50) and comprising: - a support plate (102) having a first face (102a), and - two first fittings (104a, 104b), each having a first base (106a) welded to the first face (102a), a first sleeve (110) intended to receive by fitting one end of a beam (50) and a second base (106b) welded to the second base (106b) of the other first fitting (104b, 104a).

2. Assembly (100) according to claim 1, characterized in that the support plate (102) has a second face (102b) opposite the first face (102a), and in that said assembly (100) comprises two second fittings (112a, 112b), each having a first base welded to the second face (102b), a second sleeve (118) intended to receive by fitting one end of a beam (50) and a second base (114b) welded to the second base (114b) of the other first fitting (112b, 112a).

3. Assembly (100) according to claim 2, characterized in that the first fittings (104a, 104b) and the second fittings (112a, 112b) are opposite each other.

4. Assembly (100) according to any one of claims 1 to 3, characterized in that each first base (106a) and each second base (106b, 114b) takes the form of a planar rectangle.

5. Assembly (100) according to claim 4, characterized in that it comprises between the bases (106a, 106b, 114b) of flat rectangular shape and the sleeve (110) of cylindrical shape, a transition zone (120).

6. Chassis (300) for fixing a propulsion assembly (151) to a wing (24) of an aircraft (10), said chassis (300) comprising a plurality of arches (302) and a plurality of beams (304) wherein the beams (304) are fixed to the arches (302) by means of assemblies (100) according to any one of the preceding claims, wherein each arch (302) constitutes a support plate (102) and wherein each sleeve (110, 118) receives by fitting one end of a beam (304).

7. Aircraft (10) comprising a chassis (300) according to the preceding claim, a propulsion unit (151) and a wing (24), wherein the propulsion unit (151) is fixed to the chassis (300) and wherein the chassis (300) is fixed to the wing (24).

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