Motor vehicle ventilation system incorporating an air recirculation module

Abstract

Motor vehicle ventilation device comprising an air recirculation module. The invention relates to a motor vehicle ventilation device (1), comprising a housing (2) having an injection opening (5) configured to be fluidly connected to an outside air intake duct (6), the ventilation device further comprising a recirculation module (10) configured to selectively allow the injection of interior air or outside air into the ventilation device, respectively through recirculation openings in the housing and through the injection opening. Figure for the abstract: Fig. 1

Description

Title of the invention: Ventilation device for motor vehicles comprising an air recirculation module. Technical field

[0001] The present invention relates to the field of ventilation devices, in particular for motor vehicles.

[0002] The motor vehicle may be a vehicle of category L6, L7 or M1 according to the European Union vehicle classification and may have a thermal or electric motor. It may in particular be a quadricycle type vehicle.

[0003] The invention also relates to a motor vehicle comprising such a ventilation device. Previous technique

[0004] A motor vehicle generally includes a ventilation system, in particular a heating, ventilation and air conditioning (HVAC) system, also known as an HVAC system (acronym for the English expression "Heating, ventilation, and Air-Conditioning").

[0005] An HVAC system includes ventilation, heating and cooling functions for a vehicle passenger compartment, improving occupant comfort.

[0006] HVAC systems are generally equipped with an air recirculation module located upstream of the heating and cooling units, or even upstream of the ventilation unit which includes in particular a motor also called a blower.

[0007] The recirculation module allows the quantity of air entering the HVAC system to be modulated between air from outside the vehicle and air from inside the vehicle, i.e., air from the vehicle's passenger compartment. Without a recirculation module, only outside air is injected into the HVAC system. The recirculation module thus allows the system to choose between injecting only outside air, injecting only inside air, or injecting a mixture of outside and inside air.

[0008] Recycling indoor air makes it possible in particular to limit the energy consumption of the HVAC system, since the indoor air has already been heated or cooled.

[0009] A recirculation module typically includes an opening leading to the passenger compartment that can be selectively opened or closed. This allows for the selective injection of interior air into the ventilation system.

[0010] A recirculation module generally has a significant impact on the dimensions and architecture of a ventilation system. Furthermore, the switching device allows switching between an indoor airflow configuration and a recirculation configuration. The passage of outside air, which can be a mechanical and / or electrical device, is often complex and difficult to access.

[0011] However, quadricycle type vehicles, in particular those of categories L6 or L7, have particular constraints in terms of available volumes and / or energy consumption.

[0012] Thus, in these vehicles, the ventilation systems are generally smaller than those in heavier vehicles. Their main function is to ventilate the passenger compartment and they may or may not have a heating and / or cooling function. They typically do not include an air recirculation module.

[0013] The ability to recycle the air in the passenger compartment is particularly important for an electric quadricycle vehicle, because heating or cooling the air is energy-intensive and available energy is limited.

[0014] Applications EP 2711216 A2, FR 3082785 Al, FR 3044604 Al, FR 2683188 Al, WO 2021 055758 Al, WO 2019 155135 Al disclose air inlet or air recirculation management solutions. All of these solutions are, however, of complex design.

[0015] There is therefore a need to propose a ventilation device with a simplified design, in particular for implementation in a quadricycle type vehicle.

[0016] The aim of the invention is to meet at least part of this need. Summary of the invention

[0017] To this end, the invention relates in one of its aspects to a ventilation device for a motor vehicle, comprising a housing having an injection opening configured to be fluidly connected to an outside air supply duct, the ventilation device further comprising a recirculation module configured to selectively allow the injection of interior air or outside air into the ventilation device,

[0018] the recycling module comprising a rotating movable crown and a diaphragm mounted on the crown such that the rotation of the crown controls the opening or closing of the diaphragm, the recycling module being arranged in the housing so that the diaphragm thus opens or closes the injection opening,

[0019] the crown comprising a plurality of through-holes on a surface of its periphery and the housing having a plurality of recycling openings configured so that the through-openings of the crown are arranged opposite the recycling openings of the housing when the crown is in a diaphragm closing position and that the through-openings of the crown are arranged opposite solid parts of the housing when the crown is in a diaphragm opening position, so as to respectively form an internal air passage configuration in which the injection opening is closed and the recirculation openings are open, and an external air passage configuration in which the injection opening is open and the recirculation openings are closed.

[0020] The recirculation module thus allows for the selective injection of interior air from the passenger compartment, exterior air from the duct, or a mixture of interior and exterior air in any proportion. The interior air flows through the recirculation openings and the exterior air flows through the injection opening.

[0021] Any intermediate configuration between the indoor air passage configuration and the outdoor air passage configuration is possible, the recirculation openings and the injection opening can be partially closed.

[0022] The surface of the periphery of the crown preferably forms a cylindrical part of the crown.

[0023] Preferably, the inner diameter of the crown is substantially equal to the diameter of the injection opening, the latter being of circular cross-section.

[0024] The recycling openings and the through openings of the crown can be rectangular in shape, preferably of the same dimensions.

[0025] The diaphragm is preferably disposed between the injection opening and the crown, being preferably fixed to the crown and to a lateral face of the housing which includes the injection opening, the lateral face preferably extending in a plane perpendicular to the axis of rotation of the crown. The diaphragm advantageously retains the crown on the housing.

[0026] According to an advantageous feature, the diaphragm comprises a plurality of vanes, each fixed to the crown by a first rivet forming a sliding pivot joint, i.e. a pivot joint that can slide in a respective sliding opening of an annular face of the crown and each fixed to the housing by a second rivet fixed to the housing, preferably on a lateral face of the housing parallel to the annular face, forming a pivot joint, so that the rotation of the crown relative to the housing causes the movement of the vanes and thus the opening or closing of the diaphragm.

[0027] The annular face extends in a plane perpendicular to the axis of rotation of the crown.

[0028] The rivets are mounted so as to allow the rotation of the fins and the sliding of the first rivets in the sliding openings. They are therefore not tightened in such a way as to block these movements.

[0029] According to another advantageous feature, the rotation of the crown is controlled by a rocker device comprising a leg attached to the crown, a rod extending in a plane perpendicular to the axis of rotation of the crown and connected at one end to the leg by a pivot joint and at the other end to the periphery of a pivot element which can pivot about an axis parallel to the axis of rotation of the crown, so that the pivoting of the pivot element causes a translation of the leg and thus the rotation of the crown.

[0030] The rotation of the pivot element can be controlled by a wire connected to it. The translation of this wire can be controlled manually by a user or automatically.

[0031] Preferably, the crown has a central cone disposed in the center of the crown.

[0032] The central cone may have an aerodynamic shape to facilitate the flow of outside air through the injection opening and the ring. In particular, the central cone may be frustoconical in shape and may be positioned at the center of the ring, i.e., along the axis of rotation of the ring.

[0033] Advantageously, the fins have a main body and an inner profile shaped to fit the shape of the central cone in the internal air passage configuration in which the fins are in contact with the central cone by the inner profile.

[0034] Preferably, the inner profile of the fins is made of a material less rigid than the material of the main body of the fins. The entire fin profile can be made of a material less rigid than the material of the main body of the fins.

[0035] This further improves the sealing of the diaphragm in the internal air passage configuration.

[0036] In the absence of a central cone, the fins are preferably sized to completely close the injection opening.

[0037] According to a preferred feature, the sum of the unobstructed area of ​​the recycling openings and the unobstructed area of ​​the injection opening being constant regardless of the degree of rotation of the crown.

[0038] This makes it possible to maintain a virtually constant airflow in the ventilation system, regardless of the configuration of the recirculation module. In particular, the number of recirculation openings and their surface area are chosen to meet this criterion. Preferably, the free surface area for the injection of indoor and outdoor air is sufficiently large to minimize the noise generated by the airflow.

[0039] Advantageously, the crown is rotatable through an angle between 18° and 25°, preferably 23°. In other words, the rotational position of the crown is between the internal air passage configuration and the external air passage configuration. The exterior angle differs from this angle, which is between 18° and 25°. The elements of the recycling module and the recycling openings of the housing are sized accordingly.

[0040] Thus, a short translational movement of the leg results in a limited amplitude rotation of the crown, but a significant rotation of the fins.

[0041] The recycling module is advantageously made of plastic, in particular composite, and manufactured by injection or blow molding.

[0042] Advantageously, the ventilation device according to the invention is simple and compact in design: it uses a limited number of parts. Furthermore, integrating the recycling module onto an existing ventilation device housing is quick and easy. The volume and architecture of the ventilation device remain compact because the recycling module can be integrated into the ventilation device without significantly altering its design.

[0043] Thus, the ventilation device according to the invention is particularly advantageous when implemented in a quadricycle type vehicle, by allowing air recycling to control the vehicle's energy consumption while occupying a minimal volume.

[0044] The invention also relates to a motor vehicle, in particular of type L6, L7 or Ml, in particular a quadricycle, comprising a ventilation device as described above. Brief description of the drawings

[0045] [Fig.1] Fig.1 is a perspective view of a ventilation device according to the invention.

[0046] [Fig.2] Fig.2 is an exploded view of the recycling module of the device ventilation of the [Fig.l].

[0047] [Fig.3] The [Fig.3] is a detail view of a fin of the recycling module.

[0048] [Fig.4] Fig.4 is a profile view of the fin shown in Fig.3.

[0049] [Fig.5] The [Fig.5] is a perspective view of the recycling module of the [Fig.2] in the configuration for passing outside air.

[0050] [Fig.6] Fig.6 is a view from another angle of the recycling module of the [Fig.5].

[0051] [Fig.7] Fig.7 is a perspective view of the recycling module of Fig.2 in the configuration of indoor air passage.

[0052] [Fig.8] Fig.8 is a view from another angle of the recycling module of the [Fig.7].

[0053] [Fig.9] Fig.9 is a detailed cross-sectional view of the ventilation device [Fig.1], the recycling module being in the outside air passage configuration.

[0054] [Fig. 10] The [Fig. 10] is a detailed cross-sectional view of the ventilation device of the [Fig.1], the recirculation module being in the indoor air passage configuration.

[0055] [Fig.11] The [Fig.11] is a side view of the ventilation device of the [Fig.1], the recirculation module being in the outside air passage configuration.

[0056] [Fig.12] The [Fig.12] is a side view of the ventilation device of the [Fig.1], the recirculation module being in the indoor air passage configuration.

[0057] [Fig. 13] The [Fig. 13] is a perspective view of the ventilation device of the [Fig.1], the recycling module being in the outside air passage configuration.

[0058] [Fig. 14] [Fig. 14] is a perspective view of the ventilation device of [Fig. 1], with the recirculation module in the indoor air passage configuration. Detailed description

[0059] Figure 1 illustrates a ventilation device 1 according to the invention, configured for mounting on a motor vehicle. The motor vehicle may, in particular, be of type L6, L7 or M1 in the European Union vehicle classification, preferably being an electric vehicle. The vehicle may, in particular, be a quadricycle.

[0060] The ventilation device 1 includes a housing 2 which contains its components, in particular a blower configured to generate forced air intended to be expelled by the ventilation device 1 into the vehicle's passenger compartment. The housing 2 is formed of two half-shells 3, 4 assembled in a sealed manner, which can, in particular, be held together by clips.

[0061] An injection opening 5, particularly visible in Figures 9 and 10, allows air from outside the vehicle to be injected into the ventilation device 1. The injection opening 5, which has a circular cross-section, is adapted to be fluidly connected to an air inlet duct 6, through which outside air passes. Preferably, the injection opening 5 has a cylindrical section projecting outwards from the housing 2 on a lateral face of the latter, and onto which the duct 6 is mounted. The lateral face of the housing 2 may be part of a removable cover.

[0062] The air entering the ventilation device 1 is drawn towards the blower which propels the air through the device towards the outlet ports 7, which direct the air into the passenger compartment of the vehicle.

[0063] The housing 2 of the ventilation device 1 further includes a recycling module 10, disposed in the housing in the immediate vicinity of the injection opening. The recycling module 10 is thus arranged immediately downstream of the injection opening 5.

[0064] The recycling module 10 advantageously allows the reuse of cabin air in the vehicle's ventilation system, by permitting modulation of the proportion between interior air, recycled air, and exterior air. The recycled air, or interior air, can enter the ventilation device 1 through the recycling openings 8 of the housing 2 when these are arranged opposite corresponding through-openings 23 of the ring 20 of the recycling module 10, as detailed below.

[0065] Fig. 2 represents the recycling module 10 in an exploded view.

[0066] The recycling module 10 comprises a rotating ring 20 from the central axis of the injection opening 5, a plurality of fins 30 forming a diaphragm and mounted on the crown 20 and on the housing 2, as well as a rocker device 40 which controls the rotation of the crown 20. In the embodiment shown, the recycling module 10 has six fins 30.

[0067] The ring 20 comprises a periphery 21 and a central portion 22. The periphery 21 is generally cylindrical in shape with a diameter greater than that of the injection opening 5. A section of the periphery 21 may be frustoconical in shape, and therefore of variable diameter. The periphery 21 has a plurality of regularly spaced through openings 23. It also has a hole 24 in which a tab 41 of the rocker device 40 is housed.

[0068] The central part 22 comprises an annular face 25 with an inner diameter substantially equal to the diameter of the injection opening 5. A plurality of elongated sliding openings 26, in which the first rivets 31 of the fins 30 can slide, are formed in the annular face 25. There are as many sliding openings 26 as there are fins 30. Preferably, the sliding openings 26 are regularly distributed and each extends in a radial direction from the center of the ring.

[0069] The annular face 25 can be positioned recessed from the end of the periphery 21, so that the periphery 21 protrudes over the edge of the annular face 25.

[0070] The central part 22 further comprises a central cone 27 disposed in the center of the annular face 25 and supported by arms 28 which connect the central cone 27 to the annular face 25.

[0071] Advantageously, the central cone 27 has an aerodynamic shape, in particular a frustoconical shape, in order to facilitate the flow of air from the duct 6 into the interior of the housing.

[0072] The axis of rotation of the crown 20 is advantageously coincident with the central axis of the injection opening 5.

[0073] The fins 30 are mounted on the crown 20 in a sliding manner by means of first rivets 31 inserted into the sliding openings 26. They are also fixed to the case 2 by means of second rivets 32. The fins 30 can also pivot relative to the first and second rivets. Thus, the rotation of the crown 20 relative to the case 2 causes the fins to rotate around the fixed second rivets 32, and the first rivets 31 to slide in the sliding openings 26 of the annular face 25.

[0074] As particularly visible in Figures 3 and 4, the fins 30 have a curved, banana-like or ring-shaped cross-section with a substantially constant thickness. To allow the fins 30 to overlap and form a diaphragm, they are not perfectly flat. In particular, the two end sections of the fins, each of which supports a rivet 31, 32, may be flat and parallel to each other, while the central section connecting these two ends may be inclined relative to the planes of the end sections in order to connect them.

[0075] The fins 30 partially overlap and are dimensioned to form a diaphragm, similarly to an iris diaphragm. By sliding the first rivets 31 in the sliding openings 26, they can move between the external air passage configuration, in which they are arranged behind the annular face 25 without covering the injection opening 5, and the internal air passage configuration, in which the diaphragm blocks the injection opening 5.

[0076] In the configuration of the passage of the internal air, the fins 30 completely cover the free surface of the inner diameter of the annular face 25. The fins 30 and the central cone 27 therefore prevent the passage of air from the duct 6 through the injection opening 5.

[0077] Advantageously, the inner contour 33 of the fins that comes into contact with the central cone 27 is shaped to conform to the shape of the central cone 27 in the configuration for the passage of internal air. The flow of outside air into the ventilation device 1 is thus reduced to a minimum.

[0078] The recycling module 10 further includes a rocker device 40 which allows the rotation of the ring 20 between the outside air passage configuration and the inside air passage configuration.

[0079] The rocker device 40 comprises a lug 41 inserted into the hole 24 in the periphery of the ring 20, a rod 42 connected to the lug 41 by a pivot joint, and a rocker 43. The lug 41 is also inserted into an orifice 9 in the housing 2, the length of which is sufficient to allow translation of the lug 41, as more particularly visible in Figures 13 and 14. The orifice 9 can be formed on a cylindrical section of a removable cover comprising the lateral face of the housing and the injection opening 5.

[0080] The rocker 43 has a pivot element 44 which can pivot about an axis under the action of a cable 45 attached to the pivot element 44. The free end of the rod 42 is fixed to a periphery of the pivot element 44, so that the rotation of the pivot element 44 causes the rod 42 to move and thus the leg 4L to move. The movement of the leg 41, inserted in the hole 24, causes the crown 20 to rotate.

[0081] Figures 5 and 6 are perspective views of the recycling module 10 in the outside air passage configuration. Figures 7 and 8 are perspective views of the recycling module 10 in the inside air passage configuration.

[0082] As shown in Figures 5 and 6, the recirculation module 10 is configured so that the recirculation openings 8 of the housing 2 are not aligned with the through openings 23 of the ring 20 when the diaphragm formed by the fins 30 is open. In this configuration, the passage of indoor air through the recirculation openings 8 is blocked by solid portions of the periphery of the ring 20. Outdoor air from the duct 6 can flow through the open diaphragm and enter the ventilation device.

[0083] As shown in Figures 7 and 8, the recirculation module 10 is also configured so that the recirculation openings 8 of the housing 2 are positioned opposite the through-openings 23 of the ring 20 when the diaphragm formed by the fins 30 is closed. In this configuration, the passage of outside air from the duct 6 is blocked by the fins 30 forming the diaphragm. Indoor air can flow through the recirculation openings 8 of the housing 2 and the through-openings 23 of the ring 20, which are aligned.

[0084] Any intermediate configuration between these two configurations is possible: in this case, both indoor and outdoor air can be drawn into the ventilation device 1 with varying proportions that depend on the degree of opening of the diaphragm and the degree of alignment of the through openings 23 and the recirculation openings 8.

[0085] Preferably, the recycling module 10 is configured so that the sum of the free, i.e. unobstructed, areas of the injection opening 5 and the recycling openings 8 remains substantially constant for any configuration of the recycling module, so as to allow a substantially constant airflow in the ventilation device 1. In particular, the free area of ​​the injection opening 5 in the outside air passage configuration can be substantially equal to the area of ​​the recycling openings 8.

[0086] Figures 9 and 10 are respectively detailed and cross-sectional views of the ventilation device 1 at the interface between the duct 6 and the housing 2 respectively in the outside air passage configuration and in the inside air passage configuration.

[0087] The conduit 6 is fluidically connected to the injection opening 5 of the housing 2.

[0088] In the configuration of [Fig. 9], the diaphragm formed by the fins 30 is open and outside air circulating in the duct 6 can pass through the central opening of the annular face 25 to enter the ventilation device. Inside air cannot enter the ventilation device.

[0089] In the configuration of [Fig. 10], the diaphragm formed by the fins 30 is closed and the outside air circulating in the duct 6 cannot pass through the central opening of the annular face 25. The inside air can enter the ventilation device through the through openings 23 of the ring 20, which are arranged opposite the recirculation openings 8 of the housing 2.

[0090] Figures 11 and 12 are side views of the ventilation device 1 in the outside air intake configuration and the inside air intake configuration, respectively. Figures 13 and 14 are perspective views of the ventilation device 1 in the outside air intake configuration and the inside air intake configuration, respectively.

[0091] As seen in Figures 11 to 14, the rotation of the pivot element 44 of the rocker device 40, controlled by the cable 45, drives the rod 42 and causes the leg 41 to translate in a direction perpendicular to the axis of the pivot element 44. The translation of the leg 41 in the orifice 9 of the housing causes the rotation of the crown 20 and thus the opening or closing of the diaphragm formed by the fins 30, as well as the opening or closing of the passage of internal air through the recirculation openings 8. Functioning

[0092] The recycling module 10 allows outside air, inside air or a mixture of both to be selectively passed into the ventilation device 1.

[0093] In the outside air passage configuration, as shown in Figures 5, 6, 9, 11, 13, the outside air circulating in the duct 6 enters the ventilation device 1 through the injection opening 5. The fins 30 are arranged between the annular face 25 and a lateral face of the housing 2 extending in a plane perpendicular to the axis of the injection opening 5. The fins 30 are folded back, leaving the injection opening 5 free. The through openings 23 in the periphery of the ring 20 are arranged opposite solid parts of the housing 2. Similarly, the recirculation openings 8 in the housing 2 are arranged opposite solid parts of the ring 20. Therefore, indoor air cannot enter the ventilation device 1.

[0094] The configuration of the recycling module is modified by action on cable 45. This can be a manual action performed by the user, such as rotating a button or the pressing of a button that causes the cable 45 to move, or a motorized action, either user-controlled or automatic.

[0095] The movement of the cable 45 towards the recycling module 10 causes the pivot element 44 to rotate. The free end of the rod 42, attached to a point on the periphery of the pivot element 44, then rotates around the pivot element 44. Consequently, the rod 42 pivots around the pivot joint of the leg 41 and also applies a force to the leg 41, tending to move the leg 41 away from the pivot element 44. Since the leg 41 is inserted into the hole 24 of the ring 20, this force is transmitted to the ring 20, causing it to rotate in the same direction as the rotation of the pivot element 44.

[0096] The maximum rotation of the crown 20, which corresponds to the maximum displacement of the rod 42, places the recycling module in the configuration of passage of the interior air as shown in figures 7, 8, 10, 12, 14.

[0097] Each fin 30 is fixedly attached to the case 2 by the second rivets 32, fixed to the lateral face of the case. They are also connected to the crown 20 by the first rivets 31, which can slide in the sliding openings 26 of the annular face 25 of the crown 20. Thus, the rotation of the crown 20 forces the first rivets 31 to slide and therefore each of the fins to rotate around the second rivets 23, fixed to the case 2.

[0098] The fins 30 advantageously hold the crown 20 on the case 2.

[0099] The dimensions of the recycling module 10 and the number of fins 30 are preferably chosen so that the fins 30 completely cover the free surface of the annular face 25. The presence of the central cone 27 is optional. When present, the profile of the fins 30 is preferably shaped to conform to the shape of the central cone 27 when the fins 30 are in contact with it in the internal airflow configuration.

[0100] The rotation of the crown 20 also causes the passage openings 23 to move relative to the housing 2. In the interior air passage configuration, the passage openings 23 are arranged opposite the recirculation openings 8 of the housing 2, so as to allow the passage of air from the passenger compartment to the interior of the ventilation device 1.

[0101] Any intermediate configuration between the outside air passage configuration and the inside air passage configuration is possible. The diaphragm formed by the fins 30 is then only partially open, as are the recirculation openings 8, so that a determined proportion of outside and inside air can be injected into the ventilation device 1.

[0102] Other variants and improvements may be envisaged without departing from the scope of the invention.

Claims

1.

2. Demands Ventilation device (1) for a motor vehicle, comprising a housing (2) having an injection opening (5) configured to be fluidly connected to an outside air supply duct (6), the ventilation device further comprising a recirculation module (10) configured to selectively allow the injection of interior or outside air into the ventilation device, the recirculation module having a rotatable movable ring (20) and a diaphragm mounted on the ring such that the rotation of the ring controls the opening or closing of the diaphragm, the recirculation module being arranged in the housing so that the diaphragm thus opens or closes the injection opening,the crown having a plurality of through openings (23) on a surface of its periphery and the housing having a plurality of recycling openings (8) configured such that the through openings of the crown are arranged opposite the recycling openings of the housing when the crown is in a diaphragm-closed position and the through openings of the crown are arranged opposite solid parts of the housing when the crown is in a diaphragm-opening position, so as to respectively form an internal air passage configuration in which the injection opening is closed and the recycling openings are open,and an external air passage configuration in which the injection opening is open and the recirculation openings are closed, the diaphragm comprising a plurality of vanes (30), each fixed to the crown by a first rivet (31) forming a pivot joint and capable of sliding in a respective sliding opening (26) of an annular face (25) of the crown, and each fixed to the housing by a second rivet (32) fixed to the housing, preferably on a face of the housing parallel to the annular face, forming a pivot joint, such that the rotation of the crown relative to the housing causes the displacement of the vanes and thus the opening or closing of the diaphragm. Ventilation device according to claim 1, the rotation of the crown being controlled by a rocker device (40) comprising a tab (41) integral with the crown, a rod (42) extending in a plane perpendicular to the axis of rotation of the crown and connected at one end to the leg by a pivot joint and at the other end to the periphery of a pivot element (44) which can pivot around an axis parallel to the axis of rotation of the crown, so that the pivoting of the pivot element causes a translation of the leg and thus the rotation of the crown.

3. Ventilation device according to any one of the preceding claims, the crown comprising a central cone (27) disposed in the center of the crown.

4. Ventilation device according to claim 3, wherein the fins have a main body and an inner profile (33) shaped to fit the shape of the central cone in the internal air passage configuration in which the fins are in contact with the central cone by the inner profile.

5. Ventilation device according to claim 4, the inner profile of the fins being made of a material less rigid than the material of the main body of the fins.

6. Ventilation device according to any one of the preceding claims, the sum of the unobstructed area of ​​the recycling openings and the unobstructed area of ​​the injection opening being constant regardless of the degree of rotation of the crown.

7. Ventilation device according to any one of the preceding claims, the crown being movable in rotation over an angle between 18° and 25°, preferably equal to 23°.

8. Motor vehicle, in particular of the quadricycle type, comprising a ventilation device according to one of the preceding claims.

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