Mobile duct ventilation system for motor vehicles

Abstract

The invention proposes an assembly for a ventilation system (18) for a motor vehicle. The assembly comprises: a Coanda effect air flow (24) orientation 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 orientation module. The orientation module comprises guide channels (36) with inclined outlet directions and adjoining upstream openings (40). The movable duct comprises a movable downstream opening. The upstream duct and the movable duct form a fitting section (44) with: a female bearing surface (46); a male bearing surface (48) with an arcuate surface (50) with a constant radius of curvature (52). The male bearing surface is movable in rotation relative to the female bearing surface along at least one axis of rotation inclined relative to the central axis. Figure to be published with the abstract: Figure 2

Description

Title of the invention: Mobile duct ventilation system for a motor vehicle

[0001] The invention relates to ventilation systems for a motor vehicle. The invention relates to the direction of an air flow by a Coanda effect distributor towards a motor vehicle passenger compartment. The invention relates more specifically to an assembly for a ventilation system for the passenger compartment of a motor vehicle. The invention also relates to a motor vehicle.

[0002] Vehicles conventionally have vents arranged in their passenger compartments, the role of which is to introduce air-conditioned air into the passenger compartment of the vehicle. The vents are, for example, installed on a dashboard of the vehicle. It is also known to produce an vent in which the direction of the outgoing air flow is modified using the Coanda effect. The Coanda effect corresponds to the tendency of a moving fluid to follow convex surfaces. Thanks to this effect, it is possible to guide the outlet flow by distributing the flow between different corridors having particular surface geometries, 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 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 section of the vent along this vertical axis can be reduced.

[0003] However, a passenger compartment air circulation system is not limited to the visible part of an aerator. Said system also comprises a system for producing air conditioning in order to supply air at the desired temperature to the passenger compartment, as well as air guiding channels and ducts in order to bring the latter from the air conditioning production system to the aerators distributed in the passenger compartment.

[0004] In order to guarantee an optimal level of comfort for the occupants of the passenger compartment, in particular from the aeraulic and sound point of view, it is necessary to avoid pressure losses in the air flow as well as ventilation noise. In particular, in order to fully benefit from the advantages linked to the use of the Coanda effect in the design of an air circulation system, the flow of the latter in said system must remain as laminar as possible. The junctions between the different ducts and air guide sections may have defects which disrupt the laminar flow of the air flows and generate noise and pressure losses.

[0005] A motor vehicle ventilator is known comprising a fixed inlet through which a flow of air enters the ventilator and an outlet through which the air flow exits the aerator. Channels extending from the inlet mouth to the outlet mouth, guiding the air entering through the inlet mouth to the outlet mouth, the channels being arranged so that the direction of the air flow exiting through the outlet mouth depends on the air flow rates passing through each of said channels. The aerator further comprises a guide mouth, arranged upstream of the channels and through which the air flow enters the aerator, the guide mouth being movable between a first position in which said guide mouth is in front of at least the air inlet of a first channel and a second position in which said movable guide mouth is in front of the air inlet of another channel.

[0006] The movable guide mouth is formed by a flexible guide duct so as to allow its movement. The flexible guide duct further has an intake inlet connected to a rigid ventilation duct supplying air blown by an air conditioning device. Such a 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 leaks through a mobile duct of a motor vehicle ventilation system.

[0008] According to a first aspect, the invention proposes an assembly for a motor vehicle ventilation system; the assembly comprising: a module for directing air flow towards a passenger compartment; an upstream duct intended to be connected to an air treatment unit and having a central axis; a movable duct connecting the upstream duct to the orientation module; the orientation module comprising at least two guide channels with outlet directions inclined relative to each other and having adjoining upstream openings; the movable duct comprises a downstream opening movable relative to the upstream openings; remarkable in that the upstream duct and the movable duct form a fitting section with a female bearing surface and a male bearing surface in the female bearing surface;the male bearing surface comprises at least one arcuate surface which has a constant radius of curvature and which is against the female bearing surface so that the male bearing surface is rotatable relative to the female bearing surface 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 avoids or limits their deformation. This allows their predefined geometries to be preserved, and the passing width of each of these conduits to be preserved. The interior of the conduits remains smooth.

[0010] Document EP1308374B1 presents a method for producing two dashboards using two aeraulic structures that are at least partly common. A connection between a section of flexible conduit and another conduit is provided with a ball joint, promoting the articulation and therefore the angular position of a first section. The ball joint can be provided on the rigid connection or on the flexible section. However, such a method does not provide a solution for an aerator with a flexible pipe of which a downstream end is movable.

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

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

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

[0014] Preferably, in the fitting section, the movable conduit comprises a first internal width; upstream of the fitting section, the upstream conduit comprises a second internal width less than the first internal width.

[0015] Preferably, the at least one arcuate surface comprises: a first arcuate surface with a first radius of curvature which is against the female bearing surface, a second arcuate surface with a second radius of curvature which is against the female bearing surface; the male bearing surface is capable of rotating 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 mobile conduit comprises a concave interior surface extending downstream of the male bearing surface.

[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 surface comprises a downstream end adjusted to the male bearing surface so that in the first position the male bearing surface is in abutment against the downstream end.

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

[0020] Preferably, the mobile 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 bearing guides the male bearing in rotation.

[0023] Preferably, the mobile 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 adjoining on the upstream face.

[0025] Preferably, the female bearing surface comprises an interior surface which fits the male bearing surface.

[0026] Preferably, the female bearing surface comprises an interior surface of a shape complementary to the arcuate surface of the male bearing surface.

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

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

[0029] According to another aspect, the invention proposes an assembly for a motor vehicle ventilation system; the assembly comprising: a module for directing air flow towards a passenger compartment; an upstream duct intended to be connected to an air treatment unit and having a central axis; a movable duct connecting the upstream duct to the orientation module; the orientation module comprising at least two guide channels with outlet directions inclined relative to each other and having adjoining upstream openings; the movable duct comprises a downstream opening movable relative to the upstream openings; remarkable in that the upstream duct and the movable duct form a fitting section with a rotating connection so that the movable duct is movable in rotation relative to the upstream duct in the fitting section. Such a type of fitting makes it possible to limit pressure losses.

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

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

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

[0033] The invention will be well understood and other aspects and advantages will appear clearly on reading the following description, given with reference to the appended figures and listed below.

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

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

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

[0037] [Fig.4] shows the assembly according to the second embodiment after displacement of the movable conduit relative to a central position, according to the invention.

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

[0039] In the present description, the term "longitudinal", the term "longitudinally", the term "transverse", and the term "transversely" are used according to the reference frame of the vehicle, in the mounting configuration. The term "longitudinal" corresponds to the main direction of movement of the vehicle. The term "transverse" corresponds to a direction perpendicular to the main direction of movement of the vehicle. The term "front" refers to the main direction of movement of the vehicle. The term "rear" designates 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 direct trihedron whose orientation is preserved throughout the figures.

[0041] In the present description, the equalities between the values ​​are not to be understood in the strict sense insofar as 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 the present description, the term "vertical" and the term "horizontal" are not to be understood in the strict sense of the term. Indeed, they allow an inclination of at most 20°, preferably at most 10°, more preferably at most 5°, even more preferably at most 2°; compared to the strict sense of these terms.

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

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

[0045] [Fig.l] 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 comprises 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 giving access to the passenger compartment 14 or to other compartments. In the front part, the passenger compartment passenger compartment 14 is delimited by a dashboard 16. The dashboard 16 extends transversely across the entire width of the passenger compartment 14. It accommodates various control members of the motor vehicle, as well as display devices.

[0047] In order to ensure the comfort of the occupants, including the driver and passengers (not shown), the motor vehicle 10 comprises a ventilation system 18. The ventilation system 18 allows renewal and recirculation of the air in the passenger compartment 14. The ventilation system 18 comprises a fan (not shown) driving a flow of air. It is preferably equipped with a device for heating and cooling the air. It is capable of drying the air. The 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 the on-board computer of the motor vehicle, or a programmable electronic card. Its memory (not shown) stores computer program code instructions. Its processor (not shown) executes a control program based on instructions received and measurements.

[0049] The motor vehicle may, for example, be a private motor vehicle or a utility motor vehicle.

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

[0051] The assembly comprises a module 22 for directing air flow 24 towards the passenger compartment 14. The orientation module 22 is commonly referred to as an aerator. It forms an air distribution outlet, an outlet of the ventilation system 18. The assembly also comprises an upstream duct 26. The upstream duct 26 is at a distance from the orientation module 22. It is generally a first duct. It forms a duct fixed relative to the structure of the motor vehicle. The upstream duct 26 is connected to an air treatment unit 28. They are connected in order to allow a flow of fluid between them.

[0052] The processing unit 28 is capable of heating and / or cooling air; for example captured from the environment or drawn into the passenger compartment 14. It comprises at least one heat exchanger (not shown). The processing unit 28 comprises a fan (not shown) drawing 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 circulates through the upstream duct 26. The central axis 30 may extend to the orientation module 22.

[0053] The assembly further comprises 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 even a downstream conduit. It forms a second conduit. The mobile duct 32 has an interior section decreasing towards the orientation module 22. This aspect makes it possible to accelerate the air flow 24 entering 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 guide channels 36 for the air flow 24. The guide channels 36 comprise outlet directions, towards 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, also called an ogive. The profiles of the guide channels 36, and in particular of the guide body 38, make it possible to generate a “Coanda” effect in the flow of the air flow 24. Thus, a modification of the proportion of air flow using one or other of the guide channels 36 makes it possible to direct the air flow 24 in a predefined direction. The guide body 38 is connected by fins.

[0055] The guide channels 36 comprise adjoining or adjacent upstream openings 40. The upstream openings 40 form inlets into the orientation module 22. The housing 34 comprises an upstream face, a downstream face. The upstream openings 40 of the guide channels 36 are adjoining on the upstream face. The movable duct 32 comprises a downstream opening 42. The downstream opening 42 faces the orientation module 22. It faces the upstream openings 40. The downstream opening 42 is smaller than the whole, that is to say the addition of the areas, of the upstream openings 40. The downstream opening 42 is movable relative to the upstream openings 40 in order to distribute the air flow through the upstream openings 40. The downstream opening 42 is moved towards one or other of the guide channels 36 by means of a system of slides and jacks. 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 mobile conduit 32 form a fitting section 44. The fitting section 44 forms a zone where the upstream conduit 26 and the mobile conduit 32 fit into each other. They are in contact there. The fitting section 44 comprises a female bearing surface 46 and a male bearing surface 48 in the female bearing surface 46. The female bearing surface 46 surrounds the male bearing surface 48. The bearing surfaces are segments, in particular along the central axis 30.

[0057] The male bearing surface 48 comprises at least one arcuate surface 50 which has a radius of curvature 52. The radius of curvature 52 is measured from the central axis 30. The radius of curvature 52 comprises a constant radius of curvature. For example, the arcuate surface 50 extends over 180°. The radius of curvature 52 is constant over at least 10°, preferably at least 30°. The arcuate surface 50 is against the female bearing surface 46 so that the male bearing surface 48 is rotatable relative to the female bearing surface 46 along at least one axis of rotation inclined relative to the central axis 30 of the upstream conduit 26. The arcuate surface 50 provides a seal against the female bearing surface 46. The female bearing surface 46 forms a rotational guide for the male bearing surface 48.

[0058] Thus, the invention materializes a rotating connection between the upstream duct 26 and the movable duct 32 in a fitting zone. This reduces the deformations resulting from the movements of the downstream opening 42, and makes it possible to maintain a sealed contact over a range of angular orientations of the movable duct 32. The pressure losses are then independent of the positions of the downstream opening 42, and therefore of the orientation of the air flow 24. Furthermore, the control of the pressure losses limits noise pollution, and therefore contributes to the perceived quality; in addition to preserving the flow rate.

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

[0060] The mobile 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. According to one embodiment, the second material comprises rubber or elastomer. This feature facilitates the movements of the mobile duct 32. It limits the stresses in the material, and limits the mechanical forces required to change the direction of the air flow 24 leaving the orientation module 22.

[0061] The female bearing surface 46 comprises an inner surface 54 which matches the male bearing surface 48, in this case the arcuate surface 50. The inner surface 54 comprises and follows the radius of curvature 52. The inner surface 54 is of a shape complementary to the arcuate surface 50 of the male bearing surface 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 adjoining. 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 makes it possible to optimize the vertical thickness of the orientation module, while increasing the possibilities for orienting the air flow.

[0063] The at least one arcuate surface 50 comprises a tubular-shaped surface. This aspect allows, for example, rotation along a transverse axis of rotation in the present figure. According to an alternative of the invention, the arcuate surface comprises a spherical surface, allowing rotation along two axes of rotation.

[0064] The assembly has a passage 56 passing through the mobile duct 32. The passage 56 is used by the air flow 24. The passage 56 passes through the male bearing surface 48. The at least one arcuate surface 50 surrounds the mobile duct 32. It forms a boss outside the passage 56. The arcuate surface 50 is split. It is cut by the passage 56.

[0065] In the fitting section 44, the mobile 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. The internal widths are measured parallel to each other. They are measured perpendicular to the central axis 30. This aspect limits the pressure losses in the fitting section 44, and this for different orientations of the mobile conduit 32.

[0066] The mobile duct 32 and the upstream duct 26 advantageously have rectangular sections. This makes it possible to thin them vertically and facilitate their installation in the dashboard. According to an alternative of the invention, these ducts have an ellipsoidal profile.

[0067] The at least one arcuate surface 50 comprises a first arcuate surface with a first radius of curvature. The first arcuate surface is against the female bearing surface 46. The at least one arcuate surface 50 comprises a second arcuate surface with a second radius of curvature. The second arcuate surface is against the female bearing surface 46. The male bearing surface 48 is then able to rotate relative to the upstream conduit along two axes of rotation inclined relative 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 comprises a sealing wall 62 at the interface between the orientation module 22 and the mobile conduit 32. The sealing wall 62 surrounds the downstream opening 42, and faces the upstream openings 40. It is a flexible wall, or an elastic wall. It is fixed to the orientation module 22, or formed on the mobile conduit 32. It can be made of foam, elastomer and have an accordion 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 of the invention, the female bearing is conical in shape, and the male bearing is spherical in shape. Such a configuration makes it possible to materialize a ball joint.

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

[0072] The male bearing surface 48 comprises at least one arcuate surface 50 which has a constant radius of curvature 52. The arcuate surface 50 is split by the passage 56. The male bearing surface 48 is formed by the movable conduit 32, and the female bearing surface 46 is formed by the upstream conduit 26. The downstream opening 42 is movable in order to completely or partially cover 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 at the level of the fitting section 44 which is here elongated, and / or by the profile of the movable conduit 32.

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

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

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

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

[0078] [Fig.4] shows the assembly for vehicle ventilation system 18 at automobile, 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 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 back to the lower half. The bearing surfaces 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 aspect reduces the mechanical forces compared to a built-in solution. These are distributed over the length of the movable conduit; even at the extreme positions of the movable conduit 32.

[0082] The at least two guide channels 36 of the orientation module 22 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. 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 surface 46 cooperates with the male bearing surface 48. The downstream end 66 is adjusted to the movable conduit 32 so that in the first position the male bearing surface 48 abuts against the downstream end 66 in order to curve the movable conduit 32. The movable conduit 32 is shown in dotted lines according to the shape it would have in the absence of the downstream end 66, which makes it possible to highlight its influence. This configuration makes it possible to adapt the curvatures in order to limit pressure losses. When the movable conduit 32 has a concave inner surface 64, the latter deforms in order to become parallel to the upstream conduit 26, which promotes laminar flow.

[0084] According to one embodiment, the female bearing surface 46 comprises a stop surface (not shown) upstream of the male bearing surface. The stop surface is configured to block an angular displacement of the male bearing surface 48 when the downstream opening 42 is in the first position or in the second position. This aspect increases the curvature of the movable conduit, and allows a flush fit with the internal surface of the upstream conduit. Therefore, the pressure losses decrease.

[0085] According to a preferred embodiment, the upstream conduit and / or the orientation module is made of a plastic or composite material. The plastic material may comprise a thermoplastic material 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, vinylester or polyester-vinylester resins. For example, the composite material comprises a matrix of a plastic material as described above with a reinforcement. For example, the reinforcement comprises glass or carbon fibers.

[0086] The upstream duct and / or the orientation 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 ecological footprint of the vehicle.

[0087] The invention comprises the 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

Claims

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

2. An assembly according to claim 1, characterized in that the at least one arcuate surface (50) comprises 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) passing through the movable conduit (32), the passage (56) passing through the male bearing surface (48); preferably, the at least one arcuate surface (50) surrounds the movable conduit (32).

4. Assembly according to 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) less than the first internal width (58).

5. Assembly according to one of claims 1 to 4, characterized in that the at least one arcuate surface (50) comprises: a first arcuate surface with a first radius of curvature which is against the female bearing surface (46), a second arcuate surface with a second radius of curvature which is against the female bearing surface (46); the male bearing surface (48) is able to rotate relative to the upstream conduit (26) along two axes of rotation inclined relative 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 one of claims 1 to 5, characterized in that the movable conduit (32) comprises a concave interior surface (64) extending downstream of 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) 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 surface (46) comprises a downstream end (66) adjusted to the male bearing surface (48) so that in the first position the male bearing surface (48) is in abutment 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 movable conduit (32) and the female bearing surface (46) is formed by the upstream conduit (26).

9. Assembly according to 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 is in accordance with one of claims 1 to 9; preferably, the assembly comprises an actuator capable of moving the movable duct (32).

Images