SEALING DEVICE, ARRANGEMENT AND VEHICLE WITH SUCH A SEALING DEVICE AND METHOD FOR MOUNTING A VEHICLE WITH SUCH A SEALING DEVICE

Description

[0001] The present invention relates to an assembly comprising a sealing device and a trunk, a vehicle comprising such an assembly, and a method of assembling a vehicle comprising such an assembly. Similar sealing systems are described in ES177258 U, RU2529453 C2, WO2009 / 144060 A1 and DE102019110229 A1.

[0002] In the field of vehicles, and in particular railway vehicles, it is known to fix a trunk to the body of a vehicle, the trunk being intended to accommodate vehicle equipment. It is also known to provide a passage between the trunk and the body, so as to connect the interior of the trunk to the interior of the body, in order to allow access to the equipment arranged inside the trunk, from the interior of the body, for example for maintenance operations on this equipment. This passage is formed by making a first opening in the body and a second opening in the trunk and arranged opposite the first opening.

[0003] It is also known to arrange a sealing bellows around this passage, so as to isolate this passage from the outside, in order to prevent water infiltration inside the body and the trunk, which could come for example from precipitation or even from cleaning operations on the exterior of the vehicle. Such a bellows has a first end, fixed in a sealed manner to the body, around the first opening, and a second end, fixed in a sealed manner to the trunk, around the second opening. The ends of the bellows are fixed using fixing means which are generally flanges, or clamps.

[0004] However, the use of clamps or clamps presents significant risks for the operator carrying out the attachment of the ends of the bellows. Indeed, the implementation of such attachments requires access to the first and second openings, before the trunk is attached to the vehicle body. Thus, such a bellows is generally attached while the trunk is being lifted, by being held above the body and at a distance from the body, so as to allow the operator to access the first and second openings for the installation of the clamps or clamps. After attaching the bellows, the trunk is placed on the body, then attached to the body.

[0005] The bellows must therefore be secured under a load during lifting, which is particularly dangerous. In addition, the space left free between the trunk and the body is generally small, which makes securing the ends of the bellows complex and time-consuming.

[0006] It is these drawbacks that the invention aims to remedy in particular, by proposing a sealing device that is simpler and safer to install.

[0007] For this purpose, the invention relates to an assembly as defined in claim 1.

[0008] Thanks to the invention, the sealing device makes it possible to seal a passage between the interior of a vehicle body and the interior of a trunk fixed to this body, without having to resort to fixing means requiring intervention under a load during lifting, and more precisely without requiring fixing of the sealing device to the vehicle body, because the compression spring, by spreading the two ends of the bellows, makes it possible to automatically press the ends of the bellows around the openings of the body and the trunk. The assembly of a vehicle comprising such a sealing device is thus secure and facilitated.

[0009] Advantageous, but not mandatory, aspects of the invention are specified in claims 2 to 6.

[0010] According to a second aspect, the invention also relates to a vehicle, in particular a railway vehicle, as defined in claim 7.

[0011] An advantageous but not mandatory aspect of this vehicle is specified in claim 8.

[0012] According to a third aspect, the invention also relates to a method of assembling a vehicle, in particular a railway vehicle, as defined in claim 9.

[0013] This vehicle and this assembly method induce the same advantages as those mentioned above concerning the whole invention.

[0014] The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of an embodiment of a sealing device, a trunk, a vehicle and a method of assembling a vehicle, in accordance with its principle, given solely by way of example and with reference to the appended drawings in which: [ Fig. 1 ] There figure 1 is a side view of a railway vehicle according to the invention; [ Fig. 2 ] There figure 2 is a larger-scale longitudinal section of detail II of the figure 1 ; [ Fig. 3 ] There figure 3 is a view of detail III of the figure 2 ; And [ Fig. 4 ] There figure 4 is a cut analogous to the figure 2 of a trunk according to the invention, the trunk belonging to the vehicle of the figures 1 à 3 and comprising a sealing device according to the invention.

[0015] A railway vehicle 10 is shown at the figure 1 This railway vehicle 10 comprises a body 12, delimiting an interior volume V12, and comprises wheels 14 allowing the vehicle to move on rails 16. The body 12 has a roof 18. In the example, the railway vehicle 10 is a single-car train.

[0016] As best seen at the figure 2 , the railway vehicle 10 comprises a trunk 20, which is fixed to the body 12. A structure 22 of the trunk 20 delimits an interior volume V20. In the example, the trunk 20 is fixed to the roof 18 of the body. The trunk 20 is shown in a simplified manner in figure 1 .

[0017] The trunk 20, and more precisely the structure 22 of the trunk, is fixed to the roof 18 using fixing means 24. In the example, the fixing means 24 comprise screws 26, represented in a simplified manner by center lines, and absorption pads 28, also known as “silent blocks”. In practice, the absorption pads 28 are arranged between the structure 22 and the roof 18, and are compressed by tightening the screws 26. Thus, the structure 22 of the trunk 20 is not directly in contact with the body 12, that is to say that a gap 30 is present between the trunk and the body, which makes it possible to reduce the transmission of vibrations and noise between the trunk and the body. In addition, fixing the box to the roof using absorption pads allows for low-amplitude relative movement of the box in relation to the body, which also helps to reduce vibration and noise transmission between the box and the body.

[0018] The trunk 20 includes equipment 32 which participates in the operation of the vehicle 10.

[0019] For example, the equipment 32 comprises a single-phase circuit breaker 34, an input 34A of which is connected to a power source (not shown) of the vehicle 10, such as a pantograph, and an output 34B of which is connected to a traction chain of the vehicle, also not shown, as well as a disconnector 36, which is a safety device making it possible to connect the input and output of the single-phase circuit breaker 34 to earth, in particular during maintenance operations of the vehicle. In practice, the disconnector 36 is a manually controlled mechanical disconnector, which can be actuated using a crank 37 between a rest position and a disconnected position. In the figures, the equipment 32, the circuit breaker 34 and the disconnector 36 are shown schematically. The crank 37 is shown only on the figure 3 , in a simplified way.

[0020] Alternatively, the equipment 32 is for example traction equipment, or any other electrical equipment comprising an element operable using manual means.

[0021] The roof 18 of the body 12 comprises a first opening 38, delimited by an edge 39 of the roof, and the trunk 20 comprises a second opening 40, delimited by an edge 41 of the structure 22. The trunk 20 is mounted on the roof 18 so that the first opening 38 and the second opening 40 are opposite each other, forming between them a passage 42, which connects the interior volume V12 of the body to the interior volume V20 of the trunk. In other words, the interior volume V20 of the trunk 20 is accessible from the interior volume V12 of the body 12, via the passage 42. In the example, the edges 39 and 41 delimit openings 38 and 40 of circular shape and the passage 42 is cylindrical with a circular base, and extends along an axis Z10, which is here vertical.

[0022] The passage 42 is particularly useful for facilitating access to the equipment 32. Thus, the operation of the disconnector 36 is carried out from the interior volume V12 of the body 12, by inserting the crank 37 through the passage 42 from the interior of the body until reaching the disconnector, that is to say by inserting the crank 37 through the first opening 38 then through the second opening 40.

[0023] We note H1 the height of the passage 42, measured along the axis Z10. The height H1 thus corresponds to the distance separating the roof 18 from the trunk 20, at the level of the openings 38 and 40.

[0024] The vehicle 10 comprises a sealing device 50, mounted between the trunk 20 and the body 12 so as to surround the passage 42. The sealing device 50 makes it possible to ensure a seal between the interior volumes V12 and V20 and the exterior of the vehicle 10. In other words, the sealing device 50 makes it possible to ensure a seal between the passage 42 and the exterior of the vehicle 10, and more precisely between the passage 42 and the gap 30.

[0025] As best seen at the figure 3 , the sealing device 50 comprises a bellows 52, a compression spring 54 and, advantageously, two washers 56.

[0026] The bellows 52 extends along an axis Z50, which coincides with the axis Z10 in the assembled configuration of the vehicle 10. The bellows 52 comprises an accordion-shaped wall 58, which extends along the axis Z50 and which is stretchable and compressible along the axis Z50. The wall 58 is solid and sealed. The bellows 52 comprises a first end 60 and a second end 62, connected together by the accordion-shaped wall 58. The two ends 60 and 62 are open. In the example, the bellows 52 has a symmetry of revolution around the axis Z50 and the two ends 60 and 62 are circular in shape.

[0027] In order to allow the accordion wall 58 to stretch and compress, the bellows 52 is made of a flexible material, such as silicone.

[0028] The compression spring 54 extends along the axis Z50, being coaxial with the bellows 52, and has a first end 64 and a second end 66. Preferably, the compression spring 54 is made of a metallic material, for example spring steel. In the example, the compression spring 54 is a helical spring, made from a wire with a round cross-section. Alternatively, the compression spring 54 is made from a wire of another cross-section, such as for example rectangular or elliptical. Alternatively, the compression spring is a conical spring, a volute spring, or any other type of compression spring.

[0029] Preferably, the stiffness of the compression spring 54 is between 1000 N / m and 10000 N / m, more preferably equal to 5000 N / m.

[0030] The compression spring 54 is arranged in the bellows 52 so that the ends 64 and 66 of the spring act on the ends 60 and 62 of the bellows 52, so as to separate the two ends of the bellows from each other, along the axis Z50. In other words, the first end 64 of the compression spring 54 exerts a force F1 on the first end 60 of the bellows, the second end 66 of the compression spring exerts a force F2 on the second end 62 of the bellows, and the forces F1 and F2 are directed parallel to the axis Z50 and opposite each other.

[0031] A first washer 56 is disposed between the first end 60 of the bellows and the first end 64 of the spring and the second washer 56 is disposed between the second end 62 of the bellows and the second end 66 of the spring. In other words, the washers 56 are interposed between the ends 64 and 66 of the spring 54 and the ends 60 and 62 of the bellows 52.

[0032] Particularly advantageously, the washers 56 make it possible to protect the ends 60 and 62 of the bellows 52, by avoiding direct contact of these ends with the compression spring 54, because direct contact could damage the bellows, in particular when the bellows is made of a more flexible material than that of the compression spring, for example silicone while the compression spring is made of spring steel. In addition, the washers 56 allow a more homogeneous transmission of the forces F1 and F2 from the ends 64 and 66 of the compression spring to the ends 60 and 62 of the bellows. Indeed, the washers 56 make it possible, for example, to compensate for surface defects on the ends of the compression spring.

[0033] The sealing device 50 is fixed to the box 20, and more precisely to the structure 22 of the box, so that the second end 62 of the bellows 52 is in contact with the structure 22 of the box 20, surrounding the second opening 40. For this, the bellows 52 comprises fixing means 68 making it possible to fix the second end 62 of the bellows to the edge 41 of the structure 22.

[0034] In the example, the fixing means 68 are a peripheral collar, which extends from the second end 62 of the bellows 52 through the second opening 40 to the interior volume V20 of the box 20, and which maintains the edge between the collar 68 and the second end of the bellows. The flexible nature of the material constituting the bellows 52 allows the collar 68 to be put in place through the second opening 40 by elastic deformation of the bellows, without requiring the use of tools, which facilitates the fixing of the sealing device 50 on the box 20.

[0035] To the figure 4 , the trunk 20 and the sealing device 50 are shown alone, without the body 12 of the vehicle 10. The trunk 20 and the sealing device 50 then form an assembly intended to be fixed to the body of a vehicle. In this configuration, the first end 60 of the bellows 52 is fixed to the edge 41, the second end 62 of the bellows is not in contact with anything, and the forces F1 and F2 exerted by the compression spring 54 then move the second end of the bellows away from the first end 60 of the bellows, thus relaxing the compression spring, until reaching a state of equilibrium. The sealing device 50 is then in the rest configuration. H2 denotes the height, measured along the axis Z50 in this rest configuration and separating the two ends 60 and 62 of the bellows 52.

[0036] When the trunk 20 equipped with the sealing device 50 is fixed on the body 12 of the vehicle 10, as on the figures 1 à 3 , then the first end 60 of the bellows 52 is in abutment against the body 12, more precisely with the roof 18, so as to surround the first opening 38, and the sealing device is in the mounting configuration.

[0037] Furthermore, the height H1 of the passage 42 is less than the height H2 separating the two ends 60 and 62 of the bellows 52 when the sealing device 50 is in the rest configuration. Thus, in the mounting configuration, and as better seen on the figure 3 , the sealing device is compressed between the body 12 and the trunk 20, until the height separating the two ends 60 and 62 of the bellows is equal to the height H1 of the passage 42. In other words, in the mounting configuration of the sealing device 50, the spring 54 is compressed. This compression of the spring 54 leads to an increase in the forces exerted by the spring on the two ends 60 and 62 of the bellows, via the washers 56, and thus leads to pressing the first end 60 against the body 12 and pressing the second end 62 against the trunk 20.

[0038] In other words, the ends 60 and 62 of the bellows 52 are not simply in contact with the body 12 and the trunk 20, but are kept pressed, that is to say compressed, against the body and the trunk, by the compression spring 54. In practice, in the mounting configuration, the forces F1 and F2 exerted by the compression spring on the ends of the bellows are between 50 N and 500 N, preferably equal to 200 N.

[0039] This compression of the ends of the bellows against the body and the trunk is particularly advantageous, because it makes it possible to reinforce the sealing provided by the bellows 52, that is to say that this compression reduces the risks of infiltration and projections of water from the gap 30 towards the passage 42.

[0040] Furthermore, this compression also makes it possible to tolerate flatness defects of the roof 18 and / or of the structure 22, as well as degraded surface conditions of these elements, presenting for example defects such as striations or material tears, without reducing the sealing of the sealing device 50. Indeed, the contact pressure generated by the compression of the ends of the bellows 52 by the compression spring 54, associated with the flexibility of the bellows, makes it possible to compensate for these defects.

[0041] The sealing device 50 also tolerates coplanarity defects between the first opening 38 and the second opening 40, because the spring 54, when compressed, is able to deform perpendicular to the axis Z50, for example by bending, and this deformation of the spring causes a similar deformation of the bellows 52.

[0042] Furthermore, the sealing of the passage 42 is ensured whatever the shape of the openings 38 and 40, as long as these openings are entirely surrounded by the bellows 52.

[0043] Thanks to these multiple advantages, the vehicle 10 is less expensive to manufacture, since the manufacturing constraints of the body 12 and the structure 22 of the trunk 20 are reduced.

[0044] In the example, the compression spring 54 is arranged inside the bellows 52. Thus, the spring is accessible from the passage 42, but is not accessible from outside the vehicle 10, and in particular from the gap 30. This arrangement is particularly advantageous, both to prevent the compression spring from coming into contact with water, which could lead to its degradation, in particular when it is made of spring steel, and to allow good compression of the accordion-shaped wall 58 of the spring 54. Indeed, the compression of the accordion-shaped wall 58 is generally carried out by an increase in the width of the bellows, radially to the axis Z50, while the width of the compression spring is generally constant.Furthermore, the fact that the compression spring is arranged inside the bellows 52 allows the sealing device 50 to form a unitary assembly that is easily transportable, because the spring is held in the bellows by the ends 60 and 62 of the bellows, as well as by the washers 56. In practice, the sealing device 50 is assembled by positioning the washers 56 on the two ends 62 and 64 of the compression spring 56, then the bellows 52 is put in place around the spring and the washers, by elastic deformation.

[0045] Advantageously, the first end 60 of the bellows 52 comprises at least one sealing fin 70, in the example two sealing fins 70, which are compressed against the body 12. The sealing fins 70 make it possible to improve the sealing between the first end of the bellows and the body, by reducing the contact surface between the first end of the bellows and the body, which increases the contact pressure at this contact surface.

[0046] To the figure 3 , the sealing fins are shown in their rest configuration, in order to facilitate their representation. In practice, in the mounting configuration of the sealing device 50, the sealing fins 70 are deformed until they are compressed between the first end 60 of the bellows 52 and the body 12.

[0047] Advantageously, the roof 18 of the body 12 comprises a rim 72, which extends from the edge 39 along the axis Z10, moving away from the interior volume V12 of the body, that is to say extending into the passage 42. The rim 72 thus extends inside the sealing device 50, and more precisely inside the first end 60 of the bellows 52. The rim 72 thus positions the first end of the bellows around the first opening 38, preventing sliding of the first end of the bellows radially to the axis Z10.

[0048] A method of assembling the vehicle 10 is now described, aiming to assemble the trunk 20 and the sealing device 50 on the body 12.

[0049] In a prior step, the sealing device 50 is fixed to the box 20, by means of the fixing means 68.

[0050] In a first step of the assembly method, the box 20 and the sealing device 50 are positioned on the body 12, so that the second opening 40 is opposite the first opening and so that the sealing device surrounds the passage 42, that is to say that the first end 60 of the bellows 52 is in contact with the body and that the second end 62 of the bellows is in contact with the box.

[0051] During the first step of the assembly process, the bellows 52 is further arranged so that the first end 60 of the bellows surrounds the rim 72 of the body 12. The rim 72 thus facilitates the correct positioning of the bellows 52.

[0052] In a second step of the assembly method, the box 20 is fixed to the body 12, using the fixing means 24. During this step, the compression spring 54 is compressed, until the sealing device 50 passes from its rest configuration to its mounting configuration. In the example, this compression of the spring 54 is forced when the screws 26 are screwed and the absorption pads 28 are compressed. Furthermore, when the axes Z10 and Z50 are coincident and when the box 20 is arranged above the body 12, as in the example, then the compression of the spring 54 is aided by the weight of the box 20. It is understood that during the second step, no intervention by an operator on the sealing device 50 is necessary.

[0053] At the end of the second stage, the sealing device ensures sealing between the passage 42 and the gap 30, thanks to the bellows 52 whose ends 60 and 62 are pressed against the body 12 and against the trunk 20, since the compression spring 54 separates the two ends of the spring from each other and ensures contact pressure between the bellows and the body and the trunk.

[0054] It is understood that, in the example described here, the sealing device 50 is not fixed to the body 12, and is only held in position against the body thanks to the action of the compression spring 54 which presses the first end 60 of the bellows against the body. Thus, thanks to the compression spring 54 which ensures a significant contact pressure between the bellows 52 and the body 12, the bellows does not have to be fixed to the body prior to the assembly of the vehicle 10. This characteristic goes against the prejudices of the field, according to which the bellows would necessarily be fixed to the body of the vehicle, for example using a flange or a clamp. Furthermore, this characteristic is particularly advantageous for securing the assembly process of the vehicle 10, because it is thus not necessary to fix the sealing device 50 to the body 12.However, such fixing should be carried out before fixing the trunk 20 to the body, but after the trunk is positioned above the body, that is to say such fixing should be carried out under a load being lifted, which is particularly dangerous.

[0055] Furthermore, the fact that the sealing device 50 is not fixed to the body 12 allows relative movement of the sealing device with respect to the body, which is advantageous for reducing the mechanical stresses exerted on the sealing device, for example when it is subjected to significant vibrations.

[0056] In a variant of the invention that is not shown, the sealing device 50 is not previously fixed to the trunk 20, but is previously fixed to the roof 18 of the body 12. Thus, in such a variant, the fixing means 68 do not allow the second end 62 of the bellows 52 to be fixed to the edge 41 of the structure 22, but allow the first end 60 of the bellows to be fixed to the edge 39 of the body 12. In such a variant, the method of assembling the vehicle 10 is otherwise similar to the method previously described. Preferably, in such a variant, the structure 22 of the box 20 comprises a rim, similar to the rim 72, which facilitates the positioning of the box 20 relative to the sealing device 50. Preferably, in such a variant, the second end 62 of the bellows 52 comprises sealing fins, similar to the sealing fins 70, which are compressed against the box 20.As in the embodiment shown in the figures, the method of assembling a vehicle 10 according to this variant does not require intervention under a load being lifted.

[0057] In a variant of the invention that is not shown, the sealing device 50 does not comprise any fixing means 68. Thus, in such a variant, the sealing device is neither fixed to the trunk 20 nor fixed to the body 12. In such a variant, the method of assembling the vehicle 10 is similar to the method previously described, and during the first step, the trunk 20 and the sealing device 50 are positioned on the body 12 one after the other. In practice, the sealing device is first positioned on the body, then the trunk is positioned on the sealing device and on the body. Preferably, in such a variant, the first end 60 of the bellows 52 comprises sealing fins 70, which are compressed against the body 12, and the second end 62 of the bellows comprises sealing fins similar to the sealing fins 70, which are compressed against the trunk 20.Preferably, in such a variant, the body 12 and the trunk 20 each comprise a rim 72, so as to facilitate the positioning of the sealing device 50 on the body, then the positioning of the trunk on the sealing device and on the body. In addition, at the end of the second step of the assembly method, the assembly device 50 is held on the one hand against the body 12 and on the other hand against the trunk 20 thanks to the action of the compression spring 54, which presses the ends 60 and 62 of the bellows against the body and against the trunk. As in the embodiment shown in the figures, the method of assembling a vehicle 10 according to this variant does not require intervention under a load during lifting.

[0058] In a variant of the invention not shown, the fixing means 68, which allow the bellows 52 to be fixed to the trunk 20 or to the body 12, are a flange, held in place using screws which are screwed into the edge 39 or into the edge 41, or are a clamping collar, which is tightened around a projection of complementary shape of the trunk or the body.

[0059] In a variant of the invention not shown, the sealing device 50 does not comprise washers 56, and the ends 64 and 66 of the compression spring 54 act directly on the ends 60 and 62 of the bellows 52.

[0060] In a variant of the invention not shown, the spring 54 is not arranged inside the bellows 52, but is arranged outside the bellows 52, or is integrated into the bellows 52, for example by overmolding, that is to say that the bellows 52 and the spring 54 together form a sub-assembly in one piece.

[0061] In a variant not shown, the railway vehicle 10 may be composed of several cars, each with a body 12 equipped or not with a trunk. In a variant not shown, the vehicle 10 is a tram, or a road vehicle such as a coach, an air transport vehicle, or even a maritime transport vehicle.

[0062] Any feature described for one embodiment or variation in the foregoing may be implemented for the other embodiments and variations described above, as long as technically feasible.

Claims

1. Assembly (20, 50) intended for being fastened to a body (12) of a vehicle (10), for example a railway vehicle, the vehicle body comprising a first opening (38), wherein the assembly comprises a box (20) and a sealing system (50) fastened to the box, wherein the box comprises a second opening (40) delimited by an edge (41), the box being intended for being positioned on the body in such a way that the first opening and the second opening face each other and form a passage (42) between the inside (V12) of the body and the inside (V20) of the box, the sealing system being configured for surrounding the passage, wherein the sealing system (50) comprises a bellows (52) having a first end (60) configured for being in contact with the body (12) so as to surround the first opening (38), and a second end (62), in contact with the box so as to surround the second opening (40), wherein the sealing system (50) comprises a compression spring (54) extending along an axis (Z50) and having two ends (64, 66), each of the two ends of the compression spring acting on one of the first end and second end (60, 62) of the bellows (52) so that the compression spring moves the first end and the second end of the bellows apart, along the axis (Z50), and wherein the bellows (52) comprises fasteners (68), the second end (60) of the bellows being fastened by the fasteners (68) to the edge (41) delimiting the second opening (40).

2. Assembly (20, 50) according to claim 1, wherein the sealing system (50) comprises two washers (56), each washer being held between an end (64, 66) of the compression spring (54) and an end of the bellows (52).

3. Assembly (20, 50) according to one of the preceding claims, wherein at least one of the two ends (60, 62) of the bellows comprises at least one sealing rib (70) intended for being compressed against the body (12) or against the box (20).

4. Assembly (20, 50) according to one of the preceding claims, wherein the spring (54) is arranged inside the bellows (52).

5. Assembly (20, 50) according to one of the preceding claims, wherein the spring (54) has a stiffness comprised between 1,000 N / m and 10,000 N / m, preferentially a stiffness equal to 5,000 N / m.

6. Assembly (20, 50) according to one of the preceding claims, wherein the fasteners (68) are a peripheral collar flange, extending through the second opening (40), so as to hold the edge (41) between the collar flange and the second end (62) of the bellows (52).

7. Vehicle (10), comprising: - a body (12) having a first opening (38); - a box (20) having a second opening (40), the box (20) being fastened to the body and positioned on the body in such a way that the first opening and the second opening face each other and form a passage (42) between the inside (V12) of the body and the inside (V20) of the box; and - a sealing system (50) surrounding the passage (42), wherein the box (20) and the sealing system (50) form an assembly (20, 50) according one of claims 1 to 6, and wherein the box (20) is fastened to the body (12) so as to compress the compression spring (54) between the box and the body, the compression spring pressing the first end (60) of the bellows (52) against the body and pressing the second end (52) of the bellows against the box.

8. Vehicle according to claim 7, wherein the compression spring (54) exerts forces (F1, F2) on each of the first end and second end (60, 62) of the bellows (52), comprised between 50 N and 500 N, preferentially equal to 200 N.

9. Method of assembly of a vehicle, in particular a railway vehicle, the vehicle comprising: - a body (12) having a first opening (38) ; - a box (20) having a second opening (40); and - a sealing system (50), wherein the box (20) and the sealing system (50) form an assembly according to one of claims 1 to 6, wherein the method of assembly of the vehicle (10) comprises at least the steps of : a) fastening the sealing system (50) to the box (20), using the fasteners (68), b) positioning the box (20) on the body (12) and positioning the sealing system (50) between the box and the body, so as to: ∘ arrange the second opening (40) opposite the first opening (38); ∘ surrounding with the sealing system (50) a passage (42) between the two openings (38, 40); and ∘ putting the first end (60) of the bellows (52) in contact with the body (12) and the second end (62) of the bellows in contact with the box (20) , then c) fastening the box (20) to the body (12), leading to the sealing system (50) to be held in position between the box and the body by compressing the compression spring (54) thereof.