Mobile duct ventilation system for motor vehicles

Abstract

The invention provides an assembly for a ventilation system (18) for a motor vehicle. The assembly comprises: a Coanda effect airflow (24) guidance module (22); an upstream duct (26) connected to an air treatment unit (28), with a central axis (30); a movable duct (32) connecting the upstream duct to the guidance module. The guidance module includes guide channels (36) with inclined outlet directions and adjoining upstream openings (40). The movable duct includes a movable downstream opening. The upstream duct and the movable duct form a coupling section (44) with: a female bearing (46); a male bearing (48) with an arched surface (50) of constant radius of curvature (52). The male bearing is rotatable relative to the female bearing along at least one axis of rotation inclined with respect to the central axis. Figure to be published with the abstract: Figure 2

Description

Title of the invention: Mobile duct ventilation system for motor vehicles

[0001] The invention relates to ventilation systems for a motor vehicle. The invention deals with directing an airflow by a Coanda effect distributor towards a motor vehicle passenger compartment. More specifically, the invention relates to an assembly for a passenger compartment ventilation system in a motor vehicle. The invention also relates to a motor vehicle.

[0002] Vehicles typically have air vents located in the passenger compartment, the purpose of which is to introduce conditioned air into the vehicle's interior. These vents are, for example, installed on the vehicle's dashboard. It is also known to create a vent in which the direction of the outgoing airflow is modified using the Coanda effect. The Coanda effect is the tendency of a moving fluid to flow along convex surfaces. Thanks to this effect, it is possible to guide the outgoing flow by distributing it among different channels with specific surface geometries within the vent.This allows the direction of the airflow exiting the aerator to be managed without using movable guide vanes, and the visible cross-section of the aerator to be reduced without reducing performance: for example, by using the Coanda effect to manage the vertical direction of the airflow, the visible cross-section of the aerator along this vertical axis can be reduced.

[0003] However, a passenger compartment air circulation system is not limited to the visible part of an air vent. The system also includes an air conditioning production system to supply air at the desired temperature to the passenger compartment, as well as air ducts and guides to carry the air from the air conditioning production system to the vents distributed throughout the passenger compartment.

[0004] To ensure optimal comfort for the occupants of the passenger compartment, particularly with regard to aerodynamics and noise, pressure losses in the airflow and ventilation noise must be avoided. Specifically, to fully benefit from the advantages of using the Coanda effect in the design of an air circulation system, the airflow within said system must remain as laminar as possible. The junctions between the various ducts and air guide sections may have defects that disrupt the laminar airflow and generate noise and pressure losses.

[0005] A motor vehicle ventilator is known, comprising a fixed inlet through which an airflow enters the ventilator and an outlet through which the Airflow exits the aerator. Channels extending from the inlet to the outlet guide the air entering through the inlet to the outlet. The channels are arranged so that the direction of the airflow exiting through the outlet depends on the airflow rates passing through each of these channels. The aerator also includes a guide vent, located upstream of the channels, through which the airflow enters the aerator. The guide vent is movable between a first position, in which it is in front of at least the air inlet of a first channel, and a second position, in which it is in front of the air inlet of another channel.

[0006] The movable guide vent is formed by a flexible guide duct to allow its movement. The flexible guide duct also has an inlet connected to a rigid ventilation duct supplying air blown by an air conditioning unit. This solution simplifies the aerator. However, there is a need to reduce pressure losses.

[0007] The invention aims to address at least one of the problems or drawbacks encountered in the prior art. In particular, the invention aims to reduce pressure losses in a mobile duct of a motor vehicle ventilation system. The invention also aims to optimize pressure losses and leakage through a mobile duct of a motor vehicle ventilation system.

[0008] According to a first aspect, the invention provides an assembly for a motor vehicle ventilation system; the assembly comprising: an airflow direction module for directing air towards a passenger compartment; an upstream duct intended to be connected to an air handling unit and having a central axis; a movable duct connecting the upstream duct to the direction module; the direction module comprising at least two guide channels with outlet directions inclined relative to each other and having adjacent upstream openings; the movable duct comprising a downstream opening movable relative to the upstream openings; notable in that the upstream duct and the movable duct form a coupling section with a female bearing and a male bearing within the female bearing;the male bearing includes at least one arched surface which has a constant radius of curvature and which is against the female bearing such that the male bearing is rotationally mobile relative to the female bearing along at least one axis of rotation inclined relative to the central axis of the upstream conduit.

[0009] It will be understood that the rotating surface allows free movement between the conduits and prevents or limits their deformation. This makes it possible to maintain their predefined geometries and the through-width of each conduit. The inside of the conduits remains smooth.

[0010] Document EP1308374B1 describes a method for producing two dashboards using at least two shared aerodynamic structures. A connection between one section of flexible duct and another duct is equipped with a ball joint, facilitating articulation and thus the angular positioning of the first section. The ball joint can be provided on the rigid fitting or on the flexible section. However, such a method does not provide a solution for a ventilator with a flexible hose whose downstream end is movable.

[0011] Preferably, the at least one arced surface comprises a tubular surface or a spherical surface.

[0012] Preferably, the assembly has a passage through the movable conduit, the passage through the male bearing.

[0013] Preferably, at least one arcuate surface surrounds the movable conduit.

[0014] Preferably, in the fitting section, the movable conduit includes a first internal width; upstream of the fitting section, the upstream conduit includes a second internal width that is smaller than the first internal width.

[0015] Preferably, the at least one arched surface comprises: a first arched surface with a first radius of curvature which is against the female bearing, a second arched surface with a second radius of curvature which is against the female bearing; the male bearing is able to rotate relative to the upstream conduit along two axes of rotation inclined relative to the central axis of the upstream conduit.

[0016] Preferably, the mobile conduit has a rectangular or ellipsoidal profile.

[0017] Preferably, the movable conduit comprises a concave inner surface extending downstream of the male bearing.

[0018] Preferably, the at least two guide channels comprise a first guide channel, a second guide channel; the movable conduit is movable between a first position centered on the first guide channel and a second position centered on the second guide channel, the female bearing comprises a downstream end fitted to the male bearing so that in the first position the male bearing is abutted against the downstream end.

[0019] Preferably, the male duct is formed by the mobile duct and the female duct is formed by the upstream duct.

[0020] Preferably, the moving conduit comprises a first material with a first modulus of elasticity, the upstream conduit comprises a second material with a second modulus of elasticity greater than the first modulus of elasticity.

[0021] Preferably, the second material comprises rubber or elastomer.

[0022] Preferably, the female litter guides the male litter in rotation.

[0023] Preferably, the movable conduit has an internal section decreasing towards the orientation module.

[0024] Preferably, the housing comprises an upstream face, a downstream face, the upstream openings of the channels being contiguous on the upstream face.

[0025] Preferably, the female litter comprises an inner surface that fits the male litter.

[0026] Preferably, the female litter comprises an inner surface of complementary shape to the arched surface of the male litter.

[0027] Preferably, the radius of curvature includes a constant radius of curvature.

[0028] Preferably, the assembly includes a sealing wall surrounding the movable conduit and arranged opposite the male bearing.

[0029] According to another aspect, the invention provides an assembly for a motor vehicle ventilation system; the assembly comprising: an airflow direction module for directing airflow to a passenger compartment; an upstream duct for connection to an air handling unit and having a central axis; a movable duct connecting the upstream duct to the direction module; the direction module comprising at least two guide channels with outlet directions inclined relative to each other and having adjacent upstream openings; the movable duct comprising a downstream opening movable relative to the upstream openings; notable in that the upstream duct and the movable duct form a joint section with a rotating connection such that the movable duct is rotatable relative to the upstream duct within the joint section. This type of joint helps to limit pressure losses.

[0030] According to another aspect, the invention proposes a motor vehicle comprising a ventilation system with an assembly, remarkable in that the assembly conforms to the invention.

[0031] Preferably, the assembly includes an actuator capable of moving the movable conduit.

[0032] Each feature introduced by the expression "preferably" given in relation to one of the aspects of the invention applies to all other aspects of the invention.

[0033] The invention will be well understood and other aspects and advantages will become clear upon reading the following description, given with reference to the attached figures listed below.

[0034] Fig. 1 is a side view of a motor vehicle according to the invention.

[0035] Figure 2 shows an assembly for a motor vehicle ventilation system according to a first embodiment according to the invention.

[0036] Figure 3 shows an assembly for a motor vehicle ventilation system according to a second embodiment according to the invention.

[0037] Figure 4 presents the assembly according to the second embodiment after displacement of the mobile conduit relative to a central position, according to the invention.

[0038] In the following description, the term "include" is synonymous with "include" and is not limiting in that it permits the presence of other elements in the assembly or motor vehicle to which it relates.

[0039] In this description, the terms "longitudinal," "longitudinally," "transverse," and "transversely" are used with respect to the vehicle's frame of reference in the mounting configuration. "Longitudinal" refers to the vehicle's principal direction of travel. "Transverse" refers to a direction perpendicular to the vehicle's principal direction of travel. "Front" refers to the vehicle's principal direction of travel. "Rear" refers to the opposite of the front of the vehicle.

[0040] The X-axis represents the longitudinal direction, the Y-axis represents the transverse direction, and the Z-axis represents the vertical direction of the motor vehicle. These three axes define a right-handed trihedron whose orientation is preserved throughout the figures.

[0041] In this description, equality between values ​​is not to be understood in a strict sense, since each equality allows a variation of at most 10%, preferably at most 5%, more preferably at most 2%, between these values. This also applies to the qualifier "constant".

[0042] In this description, the terms "vertical" and "horizontal" are not to be understood in their strict sense. Indeed, they allow an inclination of at most 20°, preferably at most 10°, more preferably at most 5°, and even more preferably at most 2°; with respect to the strict meaning of these terms.

[0043] In this description, the technical characteristics are defined in the assembly mounting configuration, unless otherwise explicitly stated.

[0044] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0045] Figure 1 represents a motor vehicle 10 according to the invention. The motor vehicle 10 comprises energy storage means and at least one motor (not shown) adapted to drive said motor vehicle 10.

[0046] The motor vehicle 10 includes a structure 12 delimiting the passenger compartment 14 of the motor vehicle 10. The passenger compartment 14 is intended to accommodate the occupants (not shown) of the motor vehicle 10. The passenger compartment 14 houses at least one seat. The structure 12 supports various openings providing access to the passenger compartment 14 or to other compartments. At the front, the passenger compartment The passenger compartment 14 is delimited by a dashboard 16. The dashboard 16 extends transversely across the entire width of the passenger compartment 14. It houses various vehicle control components, as well as display devices.

[0047] To ensure the comfort of the occupants, including the driver and passengers (not shown), the motor vehicle 10 includes a ventilation system 18. The ventilation system 18 allows for the renewal and recirculation of air in the passenger compartment 14. The ventilation system 18 includes a fan (not shown) that drives an airflow. It is preferably equipped with an air heating and cooling device. It is capable of dehumidifying the air. The ventilation system 18 may be an air treatment system supplied to the passenger compartment 14.

[0048] The ventilation system 18 is controlled by a control unit 20. The control unit 20 can be a computer, such as the on-board computer of a motor vehicle, or a programmable electronic board. Its memory (not shown) stores computer program code instructions. Its processor (not shown) executes a control program based on received instructions and measurements.

[0049] The motor vehicle can, for example, be a private motor vehicle or a commercial motor vehicle.

[0050] Figure 2 shows an assembly for a motor vehicle ventilation system 18, according to a first embodiment of the invention. The motor vehicle may correspond to the one shown in relation to Figure 1.

[0051] The assembly includes an airflow direction module 22 24 for directing airflow to the passenger compartment 14. The direction module 22 is commonly referred to as an air vent. It forms an air distribution outlet, an outlet of the ventilation system 18. The assembly also includes an upstream duct 26. The upstream duct 26 is located away from the direction module 22. It is generally a first duct. It forms a fixed duct relative to the structure of the motor vehicle. The upstream duct 26 is connected to an air handling unit 28. They are connected to allow fluid flow between them.

[0052] The processing unit 28 is capable of heating and / or cooling air; for example, air drawn from the environment or from the passenger compartment 14. It includes at least one heat exchanger (not shown). The processing unit 28 includes a fan (not shown) that draws in air at a variable flow rate. The upstream duct 26 has a central axis 30. The central axis 30 is the axis along which the air flows through the upstream duct 26. The central axis 30 may extend to the orientation module 22.

[0053] The assembly also includes a movable conduit 32. The movable conduit 32 connects the upstream conduit 26 to the orientation module 22. The movable conduit 32 forms a junction conduit, or a downstream conduit. It forms a second conduit. The The mobile duct 32 has an internal section that decreases towards the orientation module 22. This feature allows the airflow 24 to be accelerated at the inlet of the orientation module 22.

[0054] The orientation module 22 comprises a housing 34. The housing 34 forms the outer casing of the orientation module 22. The housing 34 contains at least two airflow guidance channels 36 for the airflow 24. The guidance channels 36 have outlet directions, towards the passenger compartment 14, which are inclined relative to each other. The at least two guidance channels 36 are separated by a guide body 38, also called a nose cone. The profiles of the guidance channels 36, and in particular of the guide body 38, generate a Coanda effect in the airflow 24. Thus, a change in the proportion of airflow passing through one or the other of the guidance channels 36 allows the airflow 24 to be directed in a predefined direction. The guide body 38 is connected by fins.

[0055] The guidance channels 36 include contiguous or adjacent upstream openings 40. The upstream openings 40 form inlets into the orientation module 22. The housing 34 comprises an upstream face and a downstream face. The upstream openings 40 of the guidance channels 36 are contiguous on their upstream faces. The movable duct 32 includes a downstream opening 42. The downstream opening 42 faces the orientation module 22. It is aligned with the upstream openings 40. The downstream opening 42 is smaller than the combined area of ​​the upstream openings 40. The downstream opening 42 is movable relative to the upstream openings 40 in order to distribute the airflow through them. The downstream opening 42 is moved towards one or the other of the guide channels 36 by means of a system of slides and cylinders. This system forms an actuator capable of moving the movable duct to a desired position. The actuator is controlled by the control unit.

[0056] The upstream conduit 26 and the movable conduit 32 form a fitting section 44. The fitting section 44 forms a zone where the upstream conduit 26 and the movable conduit 32 fit into one another. They are in contact there. The fitting section 44 comprises a female bearing 46 and a male bearing 48 within the female bearing 46. The female bearing 46 surrounds the male bearing 48. The bearings are segments, particularly along the central axis 30.

[0057] The male bearing 48 comprises at least one curved surface 50 having a radius of curvature 52. The radius of curvature 52 is measured from the central axis 30. The radius of curvature 52 has a constant radius of curvature. For example, the curved surface 50 extends over 180°. The radius of curvature 52 is constant over at least 10°, preferably at least 30°. The curved surface 50 is positioned against the female bearing 46 such that the male bearing 48 is rotationally movable relative to the female bearing 46 along at least one axis of rotation inclined with respect to the central axis 30. upstream conduit 26. The arched surface 50 ensures a seal against the female bearing 46. The female bearing 46 forms a rotational guide for the male bearing 48.

[0058] Thus, the invention provides a rotating connection between the upstream duct 26 and the movable duct 32 in a joint zone. This reduces deformations resulting from movements of the downstream opening 42 and maintains a tight seal over a range of angular orientations of the movable duct 32. Pressure losses are then independent of the positions of the downstream opening 42, and therefore of the orientation of the airflow 24. Furthermore, controlling pressure losses limits noise levels and thus contributes to perceived quality, in addition to preserving the flow rate.

[0059] In the present embodiment, the male bearing 48 is formed by the movable conduit 32, and the female bearing 46 is formed by the upstream conduit 26.

[0060] The movable duct 32 comprises a first material with a first modulus of elasticity. The upstream duct 26 comprises a second material with a second modulus of elasticity greater than the first modulus of elasticity. Preferably, the second modulus of elasticity is ten times greater than the first modulus of elasticity; more preferably, fifty times greater. In one embodiment, the second material comprises rubber or elastomer. This feature facilitates the movement of the movable duct 32. It limits the stresses in the material and reduces the mechanical forces required to change the direction of the airflow 24 exiting the orientation module 22.

[0061] The female bearing 46 includes an inner surface 54 which fits the male bearing 48, in this case the arched surface 50. The inner surface 54 includes and follows the radius of curvature 52. The inner surface 54 is complementary in shape to the arched surface 50 of the male bearing 48.

[0062] According to one embodiment, the at least two guide channels 36 comprise four guide channels 36, or eight guide channels 36. The guide channels 36 are contiguous. They form a grid. The upstream openings are arranged in two rows and two columns, or in two rows and four columns, respectively. This configuration optimizes the vertical thickness of the orientation module, while increasing the possibilities for directing the airflow.

[0063] The at least one arched surface 50 comprises a tubular surface. This feature allows, for example, rotation about a transverse axis of rotation in the present figure. According to an alternative embodiment of the invention, the arched surface comprises a spherical surface, allowing rotation about two axes of rotation.

[0064] The assembly has a passage 56 through the movable conduit 32. The passage 56 carries the airflow 24. The passage 56 passes through the male bearing 48. At least one arched surface 50 surrounds the movable conduit 32. It forms an external boss on the passage 56. The arched surface 50 is split. It is cut by the passage 56.

[0065] In the inlet section 44, the movable conduit 32 comprises a first internal width 58. Upstream of the inlet section 44, the upstream conduit 26 comprises a second internal width 60, which is smaller than the first internal width 58. The internal widths are measured parallel to each other. They are measured perpendicular to the central axis 30. This feature limits pressure losses in the inlet section 44, for different orientations of the movable conduit 32.

[0066] The movable duct 32 and the upstream duct 26 advantageously have rectangular cross-sections. This allows them to be thinned vertically and facilitates their installation in the dashboard. According to an alternative embodiment of the invention, these ducts have an ellipsoidal profile.

[0067] The at least one arched surface 50 comprises a first arched surface with a first radius of curvature. The first arched surface is against the female bearing 46. The at least one arched surface 50 comprises a second arched surface with a second radius of curvature. The second arched surface is against the female bearing 46. The male bearing 48 is then able to rotate relative to the upstream conduit along two axes of rotation inclined with respect to the central axis 30. Preferably, the two axes of rotation are perpendicular to each other. They are perpendicular to the central axis 30.

[0068] The assembly includes a sealing wall 62 at the interface between the orientation module 22 and the movable conduit 32. The sealing wall 62 surrounds the downstream opening 42 and faces the upstream openings 40. It is a flexible or elastic wall. It is fixed to the orientation module 22 or formed on the movable conduit 32. It may be made of foam or elastomer and have an accordion-like structure, or comprise a stack of plates with openings of increasing sizes. The sealing wall is opposite the male bearing surface 48.

[0069] According to an alternative of the invention, the male bearing is formed by the upstream conduit and the female bearing is formed by the mobile conduit.

[0070] According to an alternative embodiment of the invention, the female bearing surface is conical in shape, and the male bearing surface is spherical in shape. Such a configuration makes it possible to materialize a ball joint.

[0071] Figure 3 shows an assembly for a motor vehicle ventilation system 18, according to a second embodiment of the invention. The motor vehicle may correspond to the one shown in relation to Figure 1.

[0072] The male bearing 48 comprises at least one curved surface 50 having a constant radius of curvature 52. The curved surface 50 is divided by the passage 56. The male bearing 48 is formed by the movable conduit 32, and the female bearing 46 is formed by the upstream conduit 26. The downstream opening 42 is movable in order to cover totally or partially each guide channel 36, and to inject more or less air into it.

[0073] The second embodiment is substantially identical to the first embodiment. It differs from it in the insertion section 44, which is lengthened here, and / or in the profile of the movable conduit 32.

[0074] The movable conduit 32 comprises at least one concave inner surface 64 extending from the male bearing 48. Preferably, the concave inner surface 64 extends inside the socket section 44. In the embodiment where the movable conduit 32 has a rectangular inner cross-section, each face of the rectangle has a concave inner surface 64. Each concave inner surface 64 provides an increase in cross-section reducing pressure losses.

[0075] The female bearing surface 46 includes a downstream end 66 fitted to the male bearing surface 48; in this case, to the movable conduit 32. The downstream end 66 surrounds the movable conduit 32. The downstream end 66 is formed by a tubular bearing surface; that is, one of constant width. However, the downstream end 66 may be formed by a sleeve of any other shape. It may have a narrowing downstream. When the movable conduit comprises a rigid material, the downstream end limits its movement.

[0076] According to an alternative of the invention, the first material and the second material comprise moduli of elasticity equal or varying by at most 50% with respect to each other, or by at most 20% with respect to each other.

[0077] According to an alternative of the invention, the downstream end is formed by a funnel converging downstream.

[0078] Figure 4 shows the assembly for vehicle ventilation system 18. tomobile, according to the second embodiment of the invention.

[0079] The movable conduit 32 has moved relative to a central position, for example centered on the central axis 30.

[0080] The downstream opening 42 is offset upwards here in order to direct the airflow 24 downwards. This movement is accompanied by a rotation of the male bearing. In particular, the upstream end of the male bearing moves backwards in its lower half. The bearings form a mechanical connection of the annular linear type, which allows two rotations and one translation.

[0081] In the fitting section 44, the movable conduit 32 and the upstream conduit 26 rotate relative to each other. They slide against each other. This feature reduces mechanical stresses compared to a fixed solution. These stresses are distributed along the length of the movable conduit, even at the extreme positions of the movable conduit 32.

[0082] The at least two guidance channels 36 of the orientation module 22 comprise a first guidance channel 68 and a second guidance channel 70. The movable conduit 32 is movable between a first position centered on the first guidance channel 68 and a second position centered on the second guide channel 70. In these positions, the downstream opening 42 is selectively centered on one of the upstream openings 40, and at a distance from the other of the two upstream openings 40; the latter being closed.

[0083] In both the first and second positions, the downstream end 66 of the female bearing 46 cooperates with the male bearing 48. The downstream end 66 is fitted to the movable conduit 32 so that, in the first position, the male bearing 48 abuts against the downstream end 66 in order to curve the movable conduit 32. The movable conduit 32 is shown in dashed lines according to the shape it would have in the absence of the downstream end 66, thus highlighting its influence. This configuration allows the curvatures to be adapted in order to limit pressure losses. When the movable conduit 32 has a concave inner surface 64, this surface deforms to become parallel to the upstream conduit 26, which promotes laminar flow.

[0084] According to one embodiment, the female bearing 46 includes a stop surface (not shown) upstream of the male bearing. The stop surface is configured to prevent angular displacement of the male bearing 48 when the downstream opening 42 is in the first or second position. This feature increases the curvature of the moving conduit and allows it to be flush with the internal surface of the upstream conduit. Consequently, pressure losses are reduced.

[0085] According to a preferred embodiment, the upstream conduit and / or the guidance module is made of a plastic or composite material. The plastic material may include a thermoplastic or a thermosetting material. According to a preferred embodiment, the plastic material is selected from the group comprising polypropylene, polyamide, polyphthalamide, polyetheretherketone, polyphenylene sulfide, polyamide-imide, polyetherimide, polyarylamide, polyepoxide, unsaturated polyester, vinyl ester, or polyester-vinylester resins. For example, the composite material comprises a matrix of a plastic material as described above with reinforcement. For example, the reinforcement comprises glass or carbon fibers.

[0086] The upstream conduit and / or the guidance module comprises at least 10% by weight of recycled plastic material based on the total weight of the plastic material; preferably from 10 to 80% by weight; more preferably from 20 to 60% by weight or from 30 to 40% by weight. The use of recycled plastic material reduces the vehicle's environmental footprint.

[0087] The invention comprises a combination of all the embodiments illustrated by all the figures. In the first embodiment, the movable conduit comprises the concave inner surface and the upstream conduit comprises the downstream end of the second embodiment.

Claims

Demands

1. Assembly for a motor vehicle (10) ventilation system (18); the assembly comprising: an airflow (24) direction module (22) to direct airflow to a passenger compartment (14); an upstream duct (26) for connection to an air handling unit (28) and having a central axis (30); a movable duct (32) connecting the upstream duct (26) to the direction module (22); the direction module (22) comprising at least two guide channels (36) with outlet directions inclined relative to each other and having adjacent upstream openings (40); the movable duct (32) comprising a downstream opening (42) movable relative to the upstream openings (40); characterized in that the upstream conduit (26) and the mobile conduit (32) form a fitting section (44) with a female bearing (46) and a male bearing (48) in the female bearing (46);the male bearing (48) includes at least one arched surface (50) which has a constant radius of curvature (52) and which is against the female bearing (46) so that the male bearing (48) is rotationally mobile relative to the female bearing (46) along at least one axis of rotation inclined relative to the central axis (30) of the upstream conduit (26).

2. Assembly according to claim 1, characterized in that at least one arcuate surface (50) comprises a tubular surface or a spherical surface.

3. Assembly according to any one of claims 1 to 2, characterized in that the assembly has a passage (56) through the movable conduit (32), the passage (56) through the male bearing (48); preferably, at least one arched surface (50) surrounds the movable conduit (32).

4. Assembly according to any one of claims 1 to 3, characterized in that in the fitting section, (44) the movable conduit (32) comprises a first internal width (58); upstream of the fitting section (44), the upstream conduit (26) comprises a second internal width (60) smaller than the first internal width (58).

5. Assembly according to any one of claims 1 to 4, characterized in that at least one arched surface (50) comprises: a first arched surface with a first radius of curvature which is against the female bearing (46), a second arched surface with a second radius of curvature which is against the female bearing (46); the male bearing (48) is adapted to rotate relative to the upstream conduit (26) along two axes of rotation inclined with respect to the central axis (30) of the upstream conduit (26); preferably, the mobile conduit (32) has a rectangular or ellipsoidal profile.

6. Assembly according to any one of claims 1 to 5, characterized in that the movable conduit (32) comprises a concave inner surface (64) extending downstream of the male bearing (48).

7. Assembly according to any one of claims 1 to 6, characterized in that the at least two guide channels (36) comprise a first guide channel (68), a second guide channel (70); the movable conduit (32) is movable between a first position centered on the first guide channel (68) and a second position centered on the second guide channel (70), the female bearing (46) comprises a downstream end (66) fitted to the male bearing (48) so that in the first position the male bearing (48) is abutted against the downstream end (66).

8. Assembly according to any one of claims 1 to 7, characterized in that the male bearing (48) is formed by the movable conduit (32) and the female bearing (46) is formed by the upstream conduit (26).

9. Assembly according to any one of claims 1 to 8, characterized in that the movable conduit (32) comprises a first material with a first modulus of elasticity, the upstream conduit (26) comprises a second material with a second modulus of elasticity greater than the first modulus of elasticity; preferably, the second material comprises rubber or elastomer.

10. Motor vehicle (10) comprising a ventilation system (18) with an assembly, characterized in that the assembly conforms to any one of claims 1 to 9; preferably, the assembly comprises an actuator capable of moving the movable duct (32).

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