Mobile duct ventilation system for motor vehicle

Abstract

An assembly for a ventilation system (18) of a motor vehicle is provided. The assembly comprises: an air flow (24) guiding module (22) having a Coanda effect; an upstream duct (26) connected to the air treatment unit (28), having a central axis (30); a mobile conduit (32) connecting the upstream conduit to the guide module. The guide module includes a guide channel (36) having an inclined outlet direction and an adjacent upstream opening (40). The mobile conduit includes a mobile downstream opening. The upstream duct and the mobile duct form a press-fit section (44) having: a female bearing surface (46); a male bearing surface (48) having a curved surface (50) having a constant radius of curvature (52). The male bearing surface can rotate relative to the female bearing surface along at least one rotation axis inclined relative to the central axis.

Description

Technical Field

[0001] The present invention relates to a ventilation system for a motor vehicle. The invention relates to directing an air flow into a motor vehicle passenger compartment by means of a Coanda effect distributor. More particularly, the invention relates to a component for a motor vehicle passenger compartment ventilation system. The invention also relates to a motor vehicle. Background Art

[0002] Vehicles usually comprise an air vent in the passenger compartment, the purpose of which is to introduce conditioned air into the passenger compartment of the vehicle. The air vent is, for example, mounted on the vehicle dashboard. It is also known to produce an air vent in which the direction of the outgoing air flow is changed by exploiting the Coanda effect. The Coanda effect is the tendency of a moving fluid to flow along a convex surface. Due to this effect, the outlet flow can be directed by distributing the outlet flow between different channels having a specific surface geometry inside the vent. This makes it possible to manage the direction of the air flow at the vent outlet without using movable guide vanes and to reduce the visible cross-section of the vent without reducing performance: for example, by using the Coanda effect to manage the vertical direction of the air flow, the visible cross-section of the vent along this vertical axis can be reduced.

[0003] However, the passenger compartment's air circulation system is not limited to the visible vents. The system also includes an air conditioning production system to supply air at a desired temperature to the passenger compartment, and air guide channels and ducts to transport the air from the air conditioning production system to the vents distributed throughout the passenger compartment.

[0004] To ensure optimal comfort for passengers in the passenger compartment, particularly with regard to air flow and noise, air flow pressure losses and ventilation noise must be avoided. In particular, to fully benefit from the advantages associated with using the Coanda effect in the design of air circulation systems, the air flow in the system must be kept as laminar as possible. Joints between various ducts and air-guiding sections can present defects that disrupt the laminar flow of air and generate noise and pressure losses.

[0005] A motor vehicle air vent is known, comprising a fixed inlet and an outlet, wherein air flows into the vent through the fixed inlet and out of the vent through the outlet. A passage extends from the inlet to the outlet, directing air entering through the inlet to the outlet. The passage is arranged such that the direction of air flow exiting through the outlet depends on the air flow rate through each of the passages. The vent further comprises a guide opening, which is arranged upstream of the passage and through which air flows into the vent. The guide opening is movable between a first position, in which the guide opening is located in front of the air inlet of at least one of the passages, and a second position, in which the movable guide opening is located in front of the air inlet of another of the passages.

[0006] The movable guide opening is formed by a flexible guide duct to allow for its movement. The flexible guide duct further has an inlet connected to a rigid ventilation duct, which supplies air blown by the air conditioning unit. This solution simplifies the vent. However, it is necessary to reduce pressure loss. Summary of the Invention

[0007] The present invention aims to overcome at least one of the problems or disadvantages encountered in the prior art. In particular, the present invention aims to reduce pressure losses in the mobile ducting of a motor vehicle ventilation system. Another object of the present invention is to optimize pressure losses and leakage through the mobile ducting of a motor vehicle ventilation system.

[0008] According to a first aspect, the present invention proposes a component for a ventilation system of a motor vehicle; the component comprises: a module for guiding air flow toward a passenger compartment; an upstream duct for connecting to an air handling unit and having a central axis; a movable duct connecting the upstream duct to the guide module; the guide module comprises at least two guide channels, the at least two guide channels having outlet directions inclined relative to each other and having adjacent upstream openings; the movable duct comprises a downstream opening movable relative to the upstream opening; it is noteworthy that the upstream duct and the movable duct form a press-fit section having a female supporting surface and a male supporting surface located in the female supporting surface; the male supporting surface comprises at least one curved surface having a constant radius of curvature and the at least one curved surface abuts against the female supporting surface, so that the male supporting surface is rotatably movable relative to the female supporting surface along at least one rotation axis inclined relative to the central axis of the upstream duct.

[0009] Obviously, the rotating surface allows free movement between the pipes and prevents or limits their deformation. This allows them to maintain their predefined geometry and maintain the passage width of each of these pipes. The interior of the pipes remains smooth.

[0010] Document EP1308374B1 proposes a method for manufacturing two instrument panels using two at least partially shared vent structures. The connection between one section of flexible duct and the other is provided with a ball joint, thereby facilitating articulation and thus facilitating the angular position of the first section. The ball joint can be fitted to a rigid connector or a flexible section. However, such a method does not provide a solution for vents with flexible ducts whose downstream end is mobile.

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

[0012] Preferably, the assembly has a passage through the mobile conduit, the passage passing through the male bearing surface.

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

[0014] Preferentially, in the press-fit section, the movable pipe comprises a first internal width; upstream of the press-fit section, the upstream pipe comprises a second internal width that is smaller than the first internal width.

[0015] Preferably, the at least one curved surface comprises: a first curved surface having a first radius of curvature, which abuts against the female supporting surface; a second curved surface having a second radius of curvature, which abuts against the female supporting surface; the male supporting surface is rotatable relative to the upstream pipe along two rotation axes inclined relative to the central axis of the upstream pipe.

[0016] Preferably, the mobile duct has a rectangular or oval profile.

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

[0018] Preferably, the at least two guide channels include a first guide channel and a second guide channel; the movable pipe can move between a first position centered on the first guide channel and a second position centered on the second guide channel, and the female supporting surface includes a downstream end portion that fits into the male supporting surface, so that in the first position, the male supporting surface is adjacent to the downstream end portion.

[0019] Preferentially, the male bearing surface is formed by the mobile pipe and the female bearing surface is formed by the upstream pipe.

[0020] Preferably, the mobile pipeline comprises a first material having a first elastic modulus, and the upstream pipeline comprises a second material having a second elastic modulus, the second elastic modulus being greater than the first elastic modulus.

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

[0022] Preferentially, the female bearing surface guides the male bearing surface in rotation.

[0023] Preferably, the mobile duct has an internal cross section which decreases towards the guide module.

[0024] Preferably, the housing comprises an upstream face and a downstream face, the upstream opening of the passage being adjacent to the upstream face.

[0025] Preferably, the female bearing surface comprises an inner surface adapted to mate with the male bearing surface.

[0026] Preferably, the female bearing surface comprises an inner surface having a shape complementary to the curved surface of the male bearing surface.

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

[0028] Preferentially, the assembly comprises a sealing wall surrounding the mobile pipe and arranged opposite the male bearing surface.

[0029] According to another aspect, the present invention provides an assembly for a ventilation system of a motor vehicle; the assembly comprises: a module for directing an air flow toward a passenger compartment; an upstream duct for connection to an air handling unit and having a central axis; a mobile duct connecting the upstream duct to the guiding module; the guiding module comprising at least two guide channels having outlet directions inclined relative to one another and having adjacent upstream openings; the mobile duct comprising a downstream opening movable relative to the upstream opening; notably, the upstream duct and the mobile duct form a press-fit section with a rotational connection, such that the mobile duct is rotationally movable relative to the upstream duct in the press-fit section. This type of fit reduces pressure losses.

[0030] According to another aspect, the invention proposes a motor vehicle comprising a ventilation system having an assembly, notably in accordance with the invention.

[0031] Preferably, the assembly comprises an actuator capable of moving the mobile pipeline.

[0032] Every feature introduced by the expression "preferentially" in relation to one aspect of the invention applies to all other aspects of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be well understood and other aspects and advantages will become apparent upon reading the following description given with reference to the accompanying drawings listed below.

[0034] [ Figure 1 ] is an outline view of a motor vehicle according to the present invention.

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

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

[0037] [ Figure 4 ] shows an assembly according to the invention according to a second embodiment after the mobile pipeline has been moved relative to the central position. DETAILED DESCRIPTION

[0038] In the following description, the term "comprising" is synonymous with "including" and is non-limiting as it allows for the presence of other elements in the intended related motor vehicle or assembly;

[0039] In this specification, the terms "longitudinal," "longitudinally," "transverse," and "laterally" are used with respect to the vehicle's reference frame in the installation configuration. The term "longitudinal" corresponds to the primary direction of movement of the vehicle. The term "transverse" corresponds to a direction perpendicular to the primary direction of movement of the vehicle. The term "front" refers to the primary direction of movement of the vehicle. The term "rear" refers to the direction opposite to the front of the vehicle.

[0040] The X-axis represents the longitudinal direction of the motor vehicle, the Y-axis represents the transverse direction of the motor vehicle, and the Z-axis represents the vertical direction of the motor vehicle. These three axes define a direct trihedron, the orientation of which is maintained throughout the drawings.

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

[0042] In this specification, the terms "vertical" and "horizontal" are not to be understood in the strict sense of the terms. In fact, they allow an inclination of up to 20°, preferably up to 10°, more preferably up to 5°, even more preferably up to 2° relative to the strict meaning of these terms.

[0043] In this specification, unless explicitly stated otherwise, technical features are defined in the installed configuration of the component.

[0044] Throughout the specification, the same reference numbers are used across the various drawings to refer to the same or similar entities.

[0045] [ Figure 1 ] shows a motor vehicle 10 according to the invention. The motor vehicle 10 comprises an energy storage device and at least one engine (not shown) suitable for driving said motor vehicle 10.

[0046] Motor vehicle 10 includes a structure 12 that defines a passenger compartment 14 of motor vehicle 10. Passenger compartment 14 is used to accommodate an occupant (not shown) of motor vehicle 10. Passenger compartment 14 houses at least one seat. Structure 12 supports various opening elements that allow access to passenger compartment 14 or other compartments. In a front section, passenger compartment 14 is bounded by an instrument panel 16. Instrument panel 16 extends transversely across the entire width of passenger compartment 14. The instrument panel houses various control units and display devices of the motor vehicle.

[0047] To ensure the comfort of its occupants, including the driver and passengers (not shown), the motor vehicle 10 includes a ventilation system 18. Ventilation system 18 refreshes and recirculates the air in the passenger compartment 14. Ventilation system 18 includes a fan (not shown) that drives the air flow. The ventilation system is preferably equipped with an air heating and cooling device. It is suitable for drying the air. Ventilation system 18 may be a system for treating the air supplied to the passenger compartment 14.

[0048] The ventilation system 18 is controlled by a control unit 20. The control unit 20 may be a computer (such as a vehicle's onboard computer) or a programmable electronic board. A memory (not shown) of the control unit stores computer program code instructions. A processor (not shown) of the control unit executes a control program based on received instructions and measurement results.

[0049] The motor vehicle may be, for example, a passenger car or a commercial vehicle.

[0050] [ Figure 2 ] shows components for a ventilation system 18 for a motor vehicle according to a first embodiment of the present invention. The motor vehicle corresponds to the [ Figure 1 ]The motor vehicle shown.

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

[0052] The processing unit 28 is capable of heating and / or cooling air captured from the environment or drawn into the passenger compartment 14, for example. The processing unit includes at least one heat exchanger (not shown). The processing unit 28 includes a fan (not shown) that pulses the 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 guide module 22.

[0053] The assembly further includes a mobile duct 32. The mobile duct 32 connects the upstream duct 26 to the guide module 22. The mobile duct 32 forms a connecting duct or downstream duct. The mobile duct 32 forms a second duct. The mobile duct 32 has an internal cross-section that tapers toward the guide module 22. This accelerates the air flow 24 entering the guide module 22.

[0054] The guide module 22 includes a housing 34. The housing 34 forms the outer shell of the guide module 22. The housing 34 contains at least two channels 36 for guiding the air flow 24. The guide channels 36 have outlet directions toward the passenger compartment 14, which are inclined relative to each other. The at least two guide channels 36 are separated by a guide body 38, which is also called a cusp. The profile of the guide channels 36, in particular the profile of the guide body 38, generates a "Coanda" effect in the air flow 24. As a result, a change in the proportion of the air flow passing through one or the other of the guide channels 36 enables the air flow 24 to be guided along a predefined direction. The guide bodies 38 are connected by vanes.

[0055] The guide channel 36 includes an adjacent or adjacent upstream opening 40. The upstream opening 40 forms an inlet into the guide module 22. The housing 34 includes an upstream face and a downstream face. The upstream openings 40 of the guide channel 36 are adjacent on the upstream side. The mobile duct 32 includes a downstream opening 42. The downstream opening 42 faces the guide module 22. This downstream opening faces the upstream opening 40. The downstream opening 42 is smaller than the sum of the upstream openings 40, i.e., the areas of the upstream openings are added together. The downstream opening 42 is movable relative to the upstream openings 40 so as to distribute the air flow through the upstream openings 40. The downstream opening 42 is moved toward 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 mobile duct to a desired position. The actuator is controlled by a control unit.

[0056] The upstream pipe 26 and the mobile pipe 32 form a press-fit section 44. This section forms the area where the upstream pipe 26 and the mobile pipe 32 enter each other. The upstream pipe and the mobile pipe are in contact with each other. The press-fit section 44 includes a female bearing surface 46 and a male bearing surface 48 located within the female bearing surface 46. The female bearing surface 46 surrounds the male bearing surface 48. The bearing surface is a section specifically along the central axis 30.

[0057] Male bearing surface 48 includes at least one curved surface 50 having a radius of curvature 52. Radius of curvature 52 is measured from central axis 30. Radius of curvature 52 comprises a constant radius of curvature. For example, curved surface 50 extends over 180°. Radius of curvature 52 is constant over a range of at least 10°, preferably at least 30°. Curved surface 50 abuts against female bearing surface 46, allowing male bearing surface 48 to rotatably move relative to female bearing surface 46 along at least one rotational axis that is inclined relative to central axis 30 of upstream conduit 26. Curved surface 50 seals against female bearing surface 46. Female bearing surface 46 forms a rotational guide for male bearing surface 48.

[0058] Thus, the present invention forms a rotational connection between the upstream duct 26 and the mobile duct 32 in the press-fit region. This reduces deformation caused by the movement of the downstream opening 42 and enables close contact to be maintained over a range of angular orientations of the mobile duct 32. Consequently, pressure loss is independent of the position of the downstream opening 42 and, therefore, the orientation of the air flow 24. Furthermore, in addition to maintaining flow rate, controlling pressure loss also limits noise pollution and thus contributes to perceived quality.

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

[0060] The mobile duct 32 comprises a first material having a first elastic modulus. The upstream duct 26 comprises a second material having a second elastic modulus greater than the first. Preferably, the second elastic modulus is ten times greater than the first, and more preferably fifty times greater. According to one embodiment, the second material comprises rubber or an elastomer. This feature facilitates the movement of the mobile duct 32, limits stresses in the material, and limits the mechanical force required to redirect the air flow 24 at the outlet of the guide module 22.

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

[0062] According to one embodiment, the at least two guide channels 36 include four guide channels 36 or eight guide channels 36. The guide channels 36 are adjacent to each other and form a grid. The upstream openings are arranged in two rows and two columns or two rows and four columns, respectively. This configuration optimizes the vertical thickness of the guide module while increasing the air flow orientation possibilities.

[0063] At least one curved surface 50 comprises a surface of tubular shape. This aspect allows, for example, rotation along a transverse axis of rotation in the present figure. According to an alternative embodiment of the invention, the curved surface comprises a spherical surface, allowing rotation along two axes of rotation.

[0064] The assembly features a passage 56 that passes through the mobile duct 32. The air flow 24 passes through the passage 56. The passage 56 passes through the male bearing surface 48. At least one curved surface 50 surrounds the mobile duct 32. It forms an external boss on the passage 56. The curved surface 50 is split. It intersects the passage 56.

[0065] In the press-fit section 44, the mobile duct 32 includes a first internal width 58. Upstream of the press-fit section 44, the upstream duct 26 includes a second internal width 60 that is smaller than the first internal width 58. The internal widths are measured parallel to each other. The internal width is measured perpendicular to the central axis 30. This aspect limits pressure losses in the press-fit section 44 for different orientations of the mobile duct 32.

[0066] The mobile duct 32 and the upstream duct 26 advantageously have a rectangular cross section. This makes them thinner vertically and makes them easier to position in the dashboard. According to an alternative embodiment of the invention, these ducts have an oval profile.

[0067] At least one curved surface 50 includes a first curved surface having a first radius of curvature. The first curved surface abuts against the female bearing surface 46. At least one curved surface 50 includes a second curved surface having a second radius of curvature. The second curved surface abuts against the female bearing surface 46. The male bearing surface 48 is then capable of rotating relative to the upstream pipe along two rotation axes that are inclined relative to the central axis 30. Preferably, the two rotation axes are perpendicular to each other and are perpendicular to the central axis 30.

[0068] The assembly includes a sealing wall 62 located at the interface between the guide module 22 and the mobile duct 32. The sealing wall 62 surrounds the downstream opening 42 and faces the upstream opening 40. The sealing wall is a flexible or resilient wall. It is attached to the guide module 22 or formed on the mobile duct 32. The sealing wall can be made of foam or elastomer and feature an accordion-like structure or a stack of plates with openings of increasing size. The sealing wall opposes the male bearing surface 48.

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

[0070] According to an alternative embodiment of the invention, the female bearing surface is conical and the male bearing surface is spherical. Such a configuration enables a ball joint connection to be formed.

[0071] [ Figure 3 ] shows an assembly for a ventilation system 18 for a motor vehicle according to a second embodiment of the present invention. The motor vehicle corresponds to the [ Figure 1 ]The motor vehicle shown.

[0072] The male bearing surface 48 includes at least one curved surface 50 having a constant radius of curvature 52. The curved surfaces 50 are separated by passages 56. The male bearing surface 48 is formed by the movable duct 32, and the female bearing surface 46 is formed by the upstream duct 26. The downstream opening 42 can be moved to completely or partially cover each guide channel 36 and to inject more or less air into the guide channel.

[0073] The second embodiment is essentially identical to the first embodiment. The second embodiment differs from the first embodiment in that the press-fit section 44 is here a contour of the elongated and / or movable pipe 32 .

[0074] The mobile duct 32 includes at least one concave inner surface 64 extending from the male bearing surface 48. Preferably, the concave inner surface 64 extends inside the press-fit section 44. In embodiments where the mobile duct 32 has a rectangular inner cross-section, each side of the rectangle has a concave inner surface 64. Each concave inner surface 64 increases the cross-sectional area, reducing pressure loss.

[0075] The female bearing surface 46 includes a downstream end portion 66 that fits onto the male bearing surface 48 (in this case, the mobile conduit 32). The downstream end portion 66 surrounds the mobile conduit 32. The downstream end portion 66 is formed by a tubular bearing surface, i.e., has a constant width. However, the downstream end portion 66 can be formed by a sleeve of any other shape. It can narrow downstream. When the mobile conduit is made of a rigid material, the downstream end portion limits the movement of the mobile conduit.

[0076] According to an alternative of the invention, the first material and the second material comprise elastic moduli that are equal to each other or vary by up to 50% from each other, or vary by up to 20% from each other.

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

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

[0079] The mobile conduit 32 moves relative to a central location (eg, centered about the central axis 30 ).

[0080] The downstream opening 42 is here offset upwards in order to direct the air flow 24 downwards. This movement is accompanied by a rotation of the male bearing surface. In particular, the upstream end of the male bearing surface moves rearwards in the lower half. The bearing surfaces form a mechanical connection of the annular linear type, allowing two rotations and one translation.

[0081] In the press-fit section 44 , the mobile pipe 32 and the upstream pipe 26 rotate relative to each other. They slide against each other. This reduces mechanical stresses compared to flush-mounted solutions. These stresses are distributed along the length of the mobile pipe, even at the extreme points of the mobile pipe 32 .

[0082] The at least two guide channels 36 of the guide module 22 include a first guide channel 68 and a second guide channel 70. The movable duct 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. In these positions, the downstream opening 42 is selectively centered on one of the upstream openings 40 and is spaced a distance from the other of the two upstream openings 40, the other of which is closed.

[0083] In the first and second positions, the downstream end 66 of the female bearing surface 46 engages the male bearing surface 48. The downstream end 66 is adapted to the mobile duct 32 so that, in the first position, the male bearing surface 48 abuts against the downstream end 66, thereby causing the mobile duct 32 to bend. The mobile duct 32 is shown in dashed lines because it does not have the downstream end 66, which emphasizes its effect. This configuration allows the curve to be modified to limit pressure losses. When the mobile duct 32 has a concave inner surface 64, it deforms to become parallel to the upstream duct 26, which promotes laminar flow.

[0084] According to one embodiment, the female bearing surface 46 includes a stop surface (not shown) located upstream of the male bearing surface. The stop surface is configured to block angular displacement of the male bearing surface 48 when the downstream opening 42 is in the first position or the second position. This aspect increases the curvature of the mobile duct and allows it to be flush with the inner surface of the upstream duct, thereby reducing pressure losses.

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

[0086] The upstream pipe and / or the guide module contain at least 10% by weight, preferably 10% to 80% by weight, more preferably 20% to 60% by weight, or 30% to 40% by weight of recycled plastic material, based on the total weight of the plastic material. The purpose of recycled plastic material is to reduce the ecological footprint of the vehicle.

[0087] The invention comprises all combinations of the embodiments shown in all figures.In a first embodiment, the mobile conduit comprises a concave inner surface and the upstream conduit comprises the downstream end of the second embodiment.

Claims

1. An assembly for a ventilation system (18) of a motor vehicle (10); the assembly comprising: A module (22) for guiding an air flow (24) towards 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 guiding module (22); the guiding module (22) comprising at least two guide channels (36), the at least two guide channels having 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 opening (40); characterised in that the upstream The pipe (26) and the movable pipe (32) form a press-fit section (44), the press-fit section having a female bearing surface (46) and a male bearing surface (48) located in the female bearing surface (46); the male bearing surface (48) includes at least one curved surface (50), the at least one curved surface having a constant radius of curvature (52) and the at least one curved surface abutting the female bearing surface (46), so that the male bearing surface (48) can be rotatably moved relative to the female bearing surface (46) along at least one rotation axis inclined relative to the central axis (30) of the upstream pipe (26).

2. The assembly according to claim 1, characterized in that The at least one curved surface (50) includes a tubular surface or a spherical surface.

3. Assembly according to one of claims 1 to 2, characterized in that The assembly has a passage (56) through the moving pipe (32), the passage (56) passing through the male bearing surface (48); preferably, the at least one curved surface (50) surrounds the moving pipe (32).

4. Assembly according to one of claims 1 to 3, characterized in that In the press-fit section (44), the mobile conduit (32) includes a first internal width (58); upstream of the press-fit section (44), the upstream conduit (26) includes a second internal width (60) that is smaller than the first internal width (58).

5. Assembly according to one of claims 1 to 4, characterized in that The at least one curved surface (50) includes: a first curved surface having a first radius of curvature, the first curved surface abutting the female supporting surface (46); a second curved surface having a second radius of curvature, the second curved surface abutting the female supporting surface (46); the male supporting surface (48) is rotatable relative to the upstream pipe (26) along two rotation axes inclined relative to the central axis (30) of the upstream pipe (26); preferably, the movable pipe (32) has a rectangular profile or an elliptical profile.

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

7. Assembly according to one of claims 1 to 6, characterized in that The at least two guide channels (36) include a first guide channel (68) and a second guide channel (70); the movable pipe (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 supporting surface (46) includes a downstream end (66) adapted for the male supporting surface (48), such that in the first position, the male supporting surface (48) abuts against the downstream end (66).

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

9. Assembly according to one of claims 1 to 8, characterized in that The mobile pipe (32) comprises a first material having a first elastic modulus, and the upstream pipe (26) comprises a second material having a second elastic modulus, the second elastic modulus being greater than the first elastic modulus; preferably, the second material comprises rubber or elastomer.

10. A motor vehicle (10) comprising a ventilation system (18) having an assembly, characterized in that The assembly is in accordance with one of claims 1 to 9; preferentially, it comprises an actuator capable of moving the mobile conduit (32).

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