An aircraft comprising a hinged track integrated in the floor of the cabin

Abstract

An aircraft comprising hinged tracks integrated in the floor of the cabin. The aircraft comprises a floor (32) located above a central wing box (20) and in a forward fuselage section located forward of the central wing box (20). This floor (32) comprises at least one track (38) having at least a first track portion and a second track portion (52, 54) and at least one hinge (58, 60) connecting the first and second track portions (52, 54) and configured to allow a pivoting movement about a transversal and horizontal pivot pin between the connected first and second track portions (52, 54). By means of this hinge, the tracks can be integrated in the floor instead of being positioned on the floor.

Description

Technical Field

[0001] This application relates to an aircraft that includes articulated rails integrated into the floor of the cabin. Background Technology

[0002] According to one embodiment, the aircraft includes a fuselage, wings, and a central wing box, the central wing box being located in the lower portion of the fuselage and connecting the wings to the fuselage. In the case of an aircraft intended for transporting cargo, the fuselage includes a cabin located above the central wing box, and containers can be stored in the cabin. This cabin may include a floor equipped with rails on which containers can roll. For the purposes of this application, the cabin is understood to be a passenger cabin or a cargo hold.

[0003] According to one embodiment, the floor is a load-bearing structure configured to accommodate movement and / or deformation between the center wing box and the fuselage section located in front of the center wing box. Rails are attached to the floor. This configuration is not ideal because it tends to reduce the usable height between the rails and the cabin roof.

[0004] The present invention aims to overcome all or some of the defects of the prior art. Summary of the Invention

[0005] Therefore, the subject of the present invention is an aircraft comprising a floor located above a central wing box and in a forward fuselage portion, the forward fuselage portion being located longitudinally in front of the central wing box, the floor comprising at least one guide rail extending longitudinally and having at least one core.

[0006] According to the present invention, the guide rail includes at least a first guide rail portion and a second guide rail portion, and at least one hinge portion connecting a first end of the core of the first guide rail portion and a second end of the core of the second guide rail portion. The hinge portion includes: at least one splicing plate having a first end and a second end; a pivot pin oriented perpendicular to the longitudinal direction and passing through the first end of the core of the first guide rail portion and the first end of the splicing plate; and at least one first complete connection portion connecting the second end of the core of the second guide rail portion and the second end of the splicing plate.

[0007] This solution allows the guide rails to adapt to movement and / or deformation between different parts of the fuselage. Therefore, the guide rails can be integrated into the floor, thus optimizing the available height between the guide rails and the cabin ceiling in the case of a cabin floor.

[0008] According to another feature, each hinge portion includes a first splicing plate and a second splicing plate located on both sides of the core of each of the first end and the second end of the first guide rail portion and the second guide rail portion, the first splicing plate and the second splicing plate having a first end through which a pivot pin passes and a second end connected to the second end of the core of the second guide rail portion by at least one complete connecting portion.

[0009] According to another feature, the core of each of the first and second ends of the first and second guide rail portions includes a first surface and a second surface. Furthermore, each hinge portion includes a back plate that presses against the first surface of the first end of the core of the first guide rail portion and is connected to this first end via a complete connecting portion; the first end of the first splicing plate presses against the back plate; the second end of the first splicing plate presses against the first surface of the second end of the core of the second guide rail portion and is connected to this second end via a complete connecting portion; the first end of the second splicing plate presses against the second surface of the first end of the core of the first guide rail portion; the second end of the second splicing plate presses against the second surface of the second end of the core of the second guide rail portion and is connected to this second end via a complete connecting portion; a pivot pin passes through the first end of the core of the first guide rail portion, the back plate, and the first ends of the first and second splicing plates.

[0010] According to one feature, the first splicing panel includes a step between its first end and second end to accommodate the back panel.

[0011] According to another feature, the guide rail includes a horizontal plate with an upper surface, on which the core is positioned. Furthermore, the first splicing plate includes a first wing and a second wing integrally manufactured at an angle of approximately 90°. The first wing has a first end that presses against a back plate and a second end that presses against a second end of the core of the second guide rail portion. The second wing presses against the horizontal plate and is connected to the horizontal plate via a connecting element.

[0012] According to another feature, the guide rail includes two cores and a first hinge and a second hinge, each core having one hinge, the first hinge and the second hinge being symmetrical about a central plane, the central plane being parallel to the two cores and equidistant from the two cores.

[0013] According to another feature, the second wing of the first splicing plate of the first hinge portion and the second hinge portion is positioned between the two core portions.

[0014] According to another feature, the guide rail includes a front guide rail portion, a middle guide rail portion, a rear guide rail portion, at least one front hinge portion connecting the front guide rail portion and the middle guide rail portion, and at least one rear hinge portion connecting the middle guide rail portion and the rear guide rail portion, wherein the front hinge portion and the rear hinge portion are symmetrical about a transverse plane equidistant from the front guide rail portion and the rear guide rail portion.

[0015] According to another feature, the guide rail includes a front guide rail section connected to the forward fuselage section and a rear guide rail section connected to the center wing box.

[0016] According to another feature, the floor includes a plurality of guide rails spaced apart in a transverse direction perpendicular to the longitudinal direction, and a horizontal panel supported by the guide rails, the guide rails defining a space enclosed by the horizontal panel between them. Attached Figure Description

[0017] Further features and advantages will become apparent from the following description of the invention, which is given by way of example only with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a side view of the aircraft.

[0019] Figure 2 Is it through Figure 1 The longitudinal section of a portion of the aircraft's fuselage shown.

[0020] Figure 3 This is a side view of a portion of the aircraft cabin floor, illustrating one embodiment of the invention.

[0021] Figure 4 The image shows a cross-section through a portion of the aircraft cabin floor, illustrating one embodiment of the invention.

[0022] Figure 5 yes Figure 4 A perspective view of the floor guide rails shown.

[0023] Figure 6 Is it through Figure 5 The cross-section of the guide rail shown;

[0024] Figure 7 This is a perspective view of the hinge connecting the two guide rail sections, illustrating one embodiment of the invention.

[0025] Figure 8 Is Figure 7 Passing through plane P Figure 7 The longitudinal horizontal section of the hinge shown, and

[0026] Figure 9 The longitudinal horizontal section passing through the hinge connecting the two guide rail sections illustrates another embodiment. Detailed Implementation

[0027] like Figure 1 As shown, the aircraft 10 includes a fuselage 12 extending between a nose 14 and a tail cone 16, and wings 18 disposed on both sides of the fuselage 12 and connected to the fuselage via a central wing box 20.

[0028] For the remainder of this specification, the longitudinal axis 22 of the aircraft 10 corresponds to the horizontal axis (when the aircraft 10 is on the ground) extending from the nose 14 of the aircraft 10 to the tail cone 16. The longitudinal direction is the direction parallel to the longitudinal axis 22. The longitudinal plane is a plane that includes the axis parallel to the longitudinal axis 22. The lateral plane is a plane perpendicular to the longitudinal axis 22.

[0029] The concepts of front (Av) and rear (Ar) refer to the direction of airflow outside the aircraft during flight, from the front to the rear.

[0030] like Figure 2 and Figure 3 As shown, the fuselage 12 also includes a forward fuselage section 24 located in front of the central wing box 20, a main landing gear bay 26 offset rearward relative to the central wing box 20, at least one first crossbeam 28 fixed to the forward fuselage section 24, at least one second crossbeam 30 fixed to the central wing box 20, and a floor 32 located above the central wing box 20 and resting on the first crossbeam 28 and the second crossbeam 30.

[0031] According to one embodiment, the first crossbeam 28 has an I-shaped cross-section. Of course, the invention is not limited to this cross-section. Regardless of the embodiment, the first crossbeam 28 includes a first upper transverse flange S28.

[0032] According to one embodiment, the second crossbeam 30 includes a lower portion having a T-shaped cross-section and an upper portion having an I-shaped cross-section. Of course, the invention is not limited to this embodiment. Regardless of the embodiment, the second crossbeam 30 includes a second upper transverse flange S30.

[0033] During flight, the center wing box 20 tends to move relative to the rest of the fuselage 12, and more specifically relative to the forward fuselage section 24. Therefore, the center wing box 20 can deform or pivot slightly relative to the forward fuselage section 24 about a lateral and horizontal pivot axis.

[0034] According to one application, the fuselage area located above floor 32 forms a cabin 34, in which loads can be stored. The cabin includes at least one container 36 (in... Figure 2 (Indicated by dashed lines). To facilitate the movement of containers within the cabin 34, the floor 32 includes at least one guide rail 38 parallel to the longitudinal direction, extending above the central wing box 20 and within the forward fuselage section 24.

[0035] according to Figure 4 As shown in the arrangement, floor 32 includes at least one pair of parallel guide rails 38, 38'.

[0036] According to one embodiment, each guide rail 38, 38' includes horizontal extensions 40.1, 40.2 on both sides, which are configured to support a horizontal panel 42. Therefore, the floor 32 includes a plurality of guide rails 38, 38' spaced apart in the lateral direction, and a horizontal panel 42 supported by the guide rails 38, 38', the guide rails 38, 38' defining spaces enclosed by the horizontal panel 42 between each other. As a result, the guide rails 38, 38' are integrated into the floor 32 and form a load-bearing structure for the horizontal panel 42. Therefore, compared to the prior art that provides floor panels supporting guide rails, the present invention provides guide rails that support floor panels.

[0037] The horizontal panel 42 can be made of different materials, such as wood, metal, composite materials, etc.

[0038] according to Figure 4 In one embodiment shown, guide rails 38 and 38' are identical. Figure 6 As shown, each guide rail 38, 38' includes a horizontal plate 44 having an upper surface F44 oriented toward the nacelle 34, a lower surface F44' oriented toward the central wing box 20, and lateral edges forming horizontal extensions 40.1, 40.2. According to one configuration, the horizontal plate 44 is reinforced. In this case, the guide rails 38, 38' include at least one rib 46 located on and connected to the lower surface F44' of the horizontal plate 44. For example, the guide rails 38, 38' have two ribs 46, each having an inverted T-shaped profile. Each rib 46 is parallel to the longitudinal direction.

[0039] According to one arrangement, each rib 46 has a cutout 48 aligned with the first crossbeam 28 and the second crossbeam 30, such that the horizontal plate 44 rests on the first upper transverse flange S28 and the second upper transverse flange S30.

[0040] Each guide rail 38, 38' has at least one core 50, which is substantially vertical and parallel to the longitudinal direction and extends from the upper surface F44 along the direction of the nacelle 34. Each core 50 has a first surface 50.1 and a second surface 50.2 (see reference). Figure 8 and Figure 9 Each core 50 may have an I-shaped, inverted L-shaped, inverted T-shaped, or any other cross-sectional shape. A horizontal plate 44 extends on both sides of one or more cores 50.

[0041] According to one application, container 36 has rollers in its lower portion that allow it to roll. Figure 6 One arrangement shown has each guide rail 38, 38' having two parallel cores 50 spaced apart from each other by a defined distance, which depends on the width of the rollers of the container 36.

[0042] According to one embodiment, the horizontal plate 44, rib 46, and core 50 are manufactured integrally. Therefore, each guide rail 38, 38' is in the form of a non-circular element with a substantially constant cross-section.

[0043] Of course, the invention is not limited to this embodiment for guide rails 38, 38'. Regardless of the embodiment, each guide rail 38, 38' has at least one core 50 configured to mate with container 36.

[0044] according to Figure 3 In one embodiment shown, each guide rail 38, 38' includes a plurality of guide rail portions 52, 54, 56 positioned end-to-end in the longitudinal direction. According to one arrangement, each guide rail 38, 38' includes a front guide rail portion 52 fixed to the forward fuselage portion 24, a rear guide rail portion 56 fixed to the center wing box 20 (the front and rear guide rail portions are spaced apart from each other), and an intermediate guide rail portion 54 located between the front guide rail portion 52 and the rear guide rail portion 56.

[0045] The front guide rail portion 52 and the middle guide rail portion 54 are spaced a few millimeters apart. Similarly, the middle guide rail portion 54 and the rear guide rail portion 56 are spaced a few millimeters apart.

[0046] The front guide rail portion 52 and the middle guide rail portion 54 are connected by at least one front hinge portion 58. Parallel to each other, the middle guide rail portion 54 and the rear guide rail portion 56 are connected by at least one rear hinge portion 60. According to one configuration, each of the front hinge portion 58 and the rear hinge portion 60 is configured to allow pivoting movement about a transverse and horizontal pivot axis between the two connected guide rail portions 52, 54, 56.

[0047] Of course, the present invention is not limited to this embodiment. Regardless of the embodiment, the guide rails 38, 38' include: at least a first guide rail portion and a second guide rail portion 52, 54, 56 in a front guide rail position, an intermediate guide rail position, and a rear guide rail position, the first guide rail portion and the second guide rail portion being positioned end-to-end in the longitudinal direction, wherein one guide rail portion is connected to the forward fuselage portion 24 or the central wing box 20; and at least one hinge portion 58, 60, which connects the first guide rail portion and the second guide rail portion 52, 54, 56 and is configured to allow pivoting movement about a transverse and horizontal pivot axis between the connected first guide rail portion and the second guide rail portion 52, 54, 56.

[0048] according to Figure 9In the simplified embodiment shown, the hinge portions 58 and 60 connecting the first end 62.1 of the core 50 of the first guide rail portion 52 and the second end 62.2 of the core 50 of the second guide rail portion 54 include: at least one splicing plate 64 having a first end 64.1 pressing against a first surface 50.1 or a second surface 50.2 of the first end 62.1 of the core 50 of the first guide rail portion 52 and a second end 64.2 pressing against a right surface 50.1 or a left surface 50.2 of the second end 62.2 of the core 50 of the second guide rail portion 54; a pivot pin 66 oriented perpendicular to the longitudinal direction and passing through the first end 62.1 of the core 50 of the first guide rail portion 52 and the first end 64.1 of the splicing plate 64; and at least one first complete connection portion 68 connecting the second end 62.2 of the core 50 of the second guide rail portion 54 and the second end 64.2 of the splicing plate 64.

[0049] The pivot pin 66 includes a cylinder 70.1, a first stop 70.2 located at a first end of the cylinder 70.1, and a second stop 70.3 located at a second end of the cylinder 70.1. The cylinder 70.1, the first stop 70.2, and the second stop 70.3 are configured to retain the splice plate 64 against the core 50 of the first portion 52. According to one embodiment, the pivot pin 66 is a bolt, with the bolt shank corresponding to the cylinder 70.1 and the first stop 70.2, and the bolt nut corresponding to the second stop 70.3.

[0050] Furthermore, the first end portion 62.1 of the core portion 50 of the first guide rail portion 52 has a through hole 72.1 configured to receive a pivot pin 66. Parallel to this, the first end portion 64.1 of the splicing plate 64 has a through hole 72.2 configured to receive a pivot pin 66.

[0051] The connecting part 68 is a complete connecting part obtained by adhesive bonding, bolting, crimping or any other assembly technique.

[0052] according to Figure 9 In the first embodiment shown, the hinge portions 58 and 60 include a single splicing plate 64. According to this embodiment, at least one of the first end portion 62.1 and the second end portion 62.2 of the core portion 50 of the first guide rail portion 52 and the second guide rail portion 54 includes an excessively thick portion.

[0053] according to Figure 7 and Figure 8 In another embodiment shown, the hinge portions 58 and 60 include:

[0054] a. Back plate 72, the back plate presses against the first surface 50.1 of the first end 62.1 of the core 50 of the first guide rail portion 52.

[0055] b. A first splicing plate 64, the first splicing plate having a first end 64.1 that presses against the back plate 72 and a second end 64.2 that presses against the core 50 of the second guide rail portion 54.

[0056] c. A second splicing plate 64', the second splicing plate having a first end 64.1' of a second surface 50.2 of a first end 62.1 of a core portion 50 of a first guide rail portion 52 and a second end 64.2' of a second surface 50.2 of a second end 62.2 of a core portion 50 of a second guide rail portion 54.

[0057] d. Pivot pin 66, the pivot pin passing through the first end 62.1 of the core 50 of the first guide rail portion 52, the back plate 72, and the first end 64.1 of the first splicing plate 64 and the first end 64.1' of the second splicing plate 64'.

[0058] e. At least one first complete connecting portion 68, which connects the second end 62.2 of the core 50 of the second guide rail portion 54 and the second end 64.2 of the first splicing plate 64.

[0059] f. At least one second complete connecting portion 68', which connects the second end 62.2 of the core 50 of the second guide rail portion 54 and the second end 64.2' of the splicing plate 64'.

[0060] g. At least one third complete connection 68”, which connects the back plate 72 and the first end 62.1 of the core 50 of the first guide rail portion 52.

[0061] The first connecting part 68 and the second connecting part 68' can form only a single connecting part, which includes the second end 62.2 of the core 50 passing through the second guide rail part 54 and the bolts, rivets, etc. of the second end 64.2 of the first splicing plate 64 and the second end 64.2' of the second splicing plate 64'.

[0062] Further solutions are conceivable for the first connecting part 68 and the second connecting part 68' in order to obtain a complete connecting part.

[0063] The third connection 68” is a complete connection obtained by adhesive bonding, bolting, crimping or any other assembly technique.

[0064] Figure 7 and Figure 8 The pivot pin 66 of the illustrated embodiment can be connected with Figure 9 The pivot pins in the illustrated embodiments are the same.

[0065] The first splicing plate 64 includes a step 74 between its first end 64.1 and second end 64.2 to accommodate the back plate 72.

[0066] According to one embodiment, the second splicing plate 64' is in the form of a plate. The first splicing plate 64 includes two wings 76.1 and 76.2 formed at approximately 90° and integrally manufactured, namely: a first wing 76.1 having a first end that presses against a back plate 72 and a second end of a first surface 50.1 that presses against a second end 62.2 of the core 50 of the second guide rail portion 54; and a second wing 76.2 that presses against a horizontal plate 44 and is connected to the horizontal plate via a connecting element 78. This second wing 76.2 is shorter than the first wing 76.1, so that it does not extend beyond the second guide rail portion 54.

[0067] When the guide rails 38 and 38' include two cores 50, they include a first hinge 58 and a second hinge 58' (or 60, 60'), with one hinge for each core 50. These first and second hinges are symmetrical about a central plane, which is parallel to and equidistant from the two cores 50. When the first splicing plate 64 of each hinge in the first hinge 58 and the second hinge 58' (or 60, 60') includes a first wing 76.1 and a second wing 76.2, the second wing 76.2 of the first splicing plate 64 of the first hinge and the second hinge is located between the two cores 50.

[0068] When the guide rails 38, 38' include at least one front hinge portion 58, 58' and at least one rear hinge portion 60, 60', the front hinge portion 58, 58' and the rear hinge portion 60, 60' are symmetrical about a transverse plane equidistant from the front guide rail portion 52 and the rear guide rail portion 56. The back plate 72 of the front hinge portion 58, 58' and the rear hinge portion 60, 60' is connected to the front guide rail portion 52 and the rear guide rail portion 56 through a third complete connecting portion 68". The first splicing plate 64 and the second splicing plate 64' of the front hinge portion 58, 58' and the rear hinge portion 60, 60' have end portions 64.2, 64.2' of one or more core portions 50 connected to the intermediate guide rail portion 54 through the first complete connecting portion 68 and the second complete connecting portion 68'.

[0069] Regardless of the embodiment, guide rails 38, 38' include at least one core, at least a first guide rail portion and a second guide rail portion, and at least one hinge portion 58, 60 connecting a first end 62.1 of the core 50 of the first guide rail portion 52 and a second end 62.2 of the core 50 of the second guide rail portion 54. The hinge portion 58, 60 includes: at least one splicing plate 64 having a first end 64.1 and a second end 64.2; a pivot pin 66 passing through the first end 62.1 of the core 50 of the first guide rail portion 52 and the first end 64.1 of the splicing plate 64; and at least one first complete connection portion 68 connecting the second end 62.2 of the core 50 of the second guide rail portion 54 and the second end 64.2 of the splicing plate 64.

[0070] This solution allows the guide rails to adapt to movement and / or deformation between different parts of the fuselage. Therefore, the guide rails can be integrated into the floor of the cabin 34, thereby optimizing the available height between the guide rails and the cabin's overhead panel.

[0071] To strengthen the hinge, the hinge may include a back plate 72, which is configured to reinforce the core 50 of the first guide rail portion and transmit force between the pivot pin 66 and the first guide rail portion.

[0072] It may include two splicing plates 64, 64' disposed on both sides of the core of the first guide rail portion and the second guide rail portion, the splicing plates being provided to reinforce the core 50 of the second guide rail portion and to transmit force between the pivot pin 66 and the second guide rail portion.

Claims

1. An aircraft comprising a floor (32) located above a central wing box (20) and in a forward fuselage portion (24) longitudinally in front of the central wing box (20), the floor comprising at least one guide rail (38, 38') extending along the longitudinal direction and having at least one core (50); characterized in that, The guide rail (38, 38') includes at least a first guide rail portion (52) and a second guide rail portion (54), at least one hinge portion connecting a first end (62.1) of the core (50) of the first guide rail portion (52) and a second end (62.2) of the core (50) of the second guide rail portion (54), the hinge portion including: at least one splicing plate (64) having a first end (64.1) and a second end (64.2); a pivot pin (66) oriented perpendicular to the longitudinal direction and passing through the first end (62.1) of the core (50) of the first guide rail portion (52) and the first end (64.1) of the splicing plate (64); and at least one complete first connecting portion (68) connecting the second end (62.2) of the core (50) of the second guide rail portion (54) and the second end (64.2) of the splicing plate (64).

2. The aircraft according to claim 1, characterized in that, Each of the hinges includes a first splicing plate (64) and a second splicing plate (64') on both sides of the core (50) of each of the first end (62.1) and the second end (62.2) of the first guide rail portion (52) and the second guide rail portion (54), the first splicing plate (64) and the second splicing plate (64') having a first end (64.1, 64.1') through which the pivot pin (66) passes and a second end (64.2, 64.2') connected to the second end (62.2) of the core (50) of the second guide rail portion (54) by at least one complete first connecting portion (68) and at least one complete second connecting portion (68').

3. The aircraft according to claim 2, characterized in that, The core (50) of each of the first end (62.1) and the second end (62.2) of the first guide rail portion (52) and the second guide rail portion (54) includes a first face (50.1) and a second face (50.2), and each of the hinge portions includes a back plate (72), which presses against the first face (50.1) of the first end (62.1) of the core (50) of the first guide rail portion (52) and is connected to this first end (62.1) by a complete third connection portion (68''); the first end (64.1) of the first splicing plate (64) presses against the back plate (72); the second end (64.2) of the first splicing plate (64) presses against the first face (50.1) of the second end (62.2) of the core (50) of the second guide rail portion (54) and is connected to this first end (62.2) by a complete third connection portion (68''); the first end (64.1) of the first splicing plate (64) presses against the back plate (72); the second end (64.2) of the first splicing plate (64) presses against the first face (50.1) of the second end (62.2) of the core (50) of the second guide rail portion (54) and is connected to this first end (62.2) by a complete third connection portion (68''). The first connecting part (68) is connected to this second end (62.2); the first end (64.1') of the second splicing plate (64') presses against the second surface (50.2) of the first end (62.1) of the core (50) of the first guide rail part (52); the second end (64.2') of the second splicing plate (64') presses against the second surface (50.2) of the second end (62.2) of the core (50) of the second guide rail part (54) and is connected to this second end (62.2) through the complete second connecting part (68'); the pivot pin (66) passes through the first end (62.1) of the core (50) of the first guide rail part (52), the back plate (72), and the first ends (64.1, 64.1') of the first splicing plate (64) and the second splicing plate (64').

4. The aircraft according to claim 3, characterized in that, The first splicing panel (64) includes a step (74) between its first end (64.1) and second end (64.2) to accommodate the back panel (72).

5. The aircraft according to claim 3 or 4, characterized in that, The guide rail (38, 38') includes a horizontal plate (44) having an upper surface (F44), the core (50) being positioned on the upper surface, and the first splicing plate (64) including a first wing (76.1) and a second wing (76.2) integrally produced at a 90° angle, the first wing (76.1) having a first end pressing against the back plate (72) and a second end of a first surface (50.1) pressing against the second end (62.2) of the core (50) of the second guide rail portion (54), the second wing (76.2) pressing against the horizontal plate (44) and connected to the horizontal plate by a connecting element (78).

6. The aircraft according to claim 1 or 2, characterized in that, The guide rail (38, 38') includes two cores (50), and at least one hinge includes a first hinge (58, 60) and a second hinge (58', 60'), with one hinge for each core (50), the first hinge and the second hinge being symmetrical about a central plane, the central plane being parallel to the two cores (50) and equidistant from the two cores (50).

7. The aircraft according to claim 6, characterized in that, The second wing (76.2) of the first splicing plate (64) of the first hinge portion and the second hinge portion is positioned between the two core portions (50).

8. The aircraft according to claim 6, characterized in that, The guide rail (38, 38') includes a front guide rail portion, a middle guide rail portion, a rear guide rail portion (56), at least one front hinge portion connecting the front guide rail portion and the middle guide rail portion, and at least one rear hinge portion connecting the middle guide rail portion and the rear guide rail portion (56). The first guide rail portion (52) constitutes the front guide rail portion, the second guide rail portion (54) constitutes the middle guide rail portion, a first hinge portion of the first hinge portion (58, 60) and a second hinge portion of the second hinge portion (58', 60') constitute the front hinge portion, another first hinge portion of the first hinge portion (58, 60) and another second hinge portion of the second hinge portion (58', 60') constitute the rear hinge portion, and the front hinge portion and the rear hinge portion are symmetrical about a transverse plane equidistant from the front guide rail portion and the rear guide rail portion (56).

9. The aircraft according to claim 8, characterized in that, The guide rail (38, 38') includes a front guide rail portion connected to the front fuselage portion (24), and the guide rail (38, 38') includes a rear guide rail portion (56) connected to the central wing box (20).

10. The aircraft according to claim 1 or 2, characterized in that, The floor (32) includes a plurality of guide rails (38, 38') spaced apart in a transverse direction perpendicular to the longitudinal direction, and a horizontal panel (42) supported by the guide rails (38, 38'), the guide rails (38, 38') defining a space enclosed by the horizontal panel (42) between each other.

Images