EP3697675A1 - Motor vehicle moveable rear diffuser with multiple panels - Google Patents

Motor vehicle moveable rear diffuser with multiple panels

Info

Publication number
EP3697675A1
EP3697675A1 EP18789413.4A EP18789413A EP3697675A1 EP 3697675 A1 EP3697675 A1 EP 3697675A1 EP 18789413 A EP18789413 A EP 18789413A EP 3697675 A1 EP3697675 A1 EP 3697675A1
Authority
EP
European Patent Office
Prior art keywords
panel
diffuser
primary
vehicle
rear diffuser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18789413.4A
Other languages
German (de)
French (fr)
Inventor
Aurélien Moressee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plastic Omnium SE
Original Assignee
Plastic Omnium SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plastic Omnium SE filed Critical Plastic Omnium SE
Publication of EP3697675A1 publication Critical patent/EP3697675A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/007—Rear spoilers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/02—Streamlining the undersurfaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/82—Elements for improving aerodynamics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

Definitions

  • the invention relates to the rear diffusers of motor vehicles and more particularly the movable rear diffusers.
  • the rear diffuser is a part that can be present in the rear of a motor vehicle, more precisely under the frame or in the lower part of the bumper, and for the purpose of improving the aerodynamic performance of the vehicle. It may for example be to improve the ground support of the vehicle.
  • Some diffusers allow them to improve the aerodynamic performance of the vehicle by reducing the drag of the vehicle, that is to say the force opposing the movement of the vehicle in the air. It is a question of shifting back the points of separation of the air with respect to the vehicle, that is to say the points at which the air does not follow the body any more. This allows to push back the depression created at the rear of the vehicle and thus limit the effect of restraint (called “suction effect”) of this depression on the motor vehicle.
  • the diffuser in its deployed position, reveals major openings between the movable panel and the rear bumper of the vehicle. Indeed, it appears a central opening between the body part and the diffuser panel, and two side openings on each side of the panel.
  • These openings may allow many types of foreign bodies to enter the device. These foreign bodies can be dust, mud, snow in winter weather, or any other type of dirt. These foreign bodies can, in sufficient quantity, block the closure of the device. In case of mud or snow, the diffuser can be locked in the deployed position. Similarly, dust can become dirty and damage the mechanical elements necessary for deployment and retraction of the mobile panel.
  • the diffuser can no longer improve the aerodynamic performance of the vehicle, and requires maintenance and / or replacement that can be expensive. Then these openings can be perceived as being unsightly for the motorist, as detrimental to the overall aesthetics of the vehicle. Thus, such a device can affect the perceived quality of the vehicle as a whole.
  • Another solution is to use a soft cover component between the movable panel of the diffuser and the bumper of the vehicle.
  • This component closes the void left when the diffuser is deployed.
  • dirt dirt, mud or other
  • the appearance of such a flexible component can adversely affect the quality perceived by the user and deteriorate the aesthetics of the vehicle.
  • This component can also vibrate more easily than a rigid panel and cause noise.
  • such a flexible component has a low resistance to fatigue caused by many cycles of opening and closing the panel.
  • Another solution consists in using two panels each guided in rotation relative to the bodywork part to which they are each fixed by one of their ends.
  • the first panel acts as a diffuser and the second serves to obstruct the central opening between the first and the body.
  • the two panels rub against each other during deployment and retraction, which wears their surfaces in contact and denies the aesthetic appearance of the diffuser.
  • the second panel is visible in the retracted position, which also affects the aesthetics of the vehicle.
  • the invention aims to overcome these disadvantages by providing a vehicle rear diffuser does not clog, and thus limiting the risk of failure of the device.
  • the invention also aims to provide a vehicle rear diffuser does not detract from the aesthetics of the vehicle (particularly in the deployed position), thus having no adverse impact on the quality perceived by the motorist.
  • the invention relates to a rear diffuser of a motor vehicle comprising a primary panel and at least one secondary panel, each of these panels being movable between an extended position and a retracted position when the rear diffuser is fixed on a vehicle bodywork part , characterized in that, when the bodywork part is fixed to a motor vehicle, the secondary panel is completely invisible from the outside in the retracted position and at least partially obstructs an opening between the bodywork part and the primary panel in the deployed position.
  • the secondary panel of the diffuser is protected from soiling when the diffuser is in the retracted position.
  • the secondary panel obstructs, at least partially an opening created during deployment between the primary panel and the rest of the rear bumper of the vehicle.
  • three openings are created, a central between the primary panel and the bodywork part, and two sideways located on the sides of the primary panel.
  • the secondary panel obstructs the central opening.
  • the occupation of this opening by the secondary panel makes it possible to prevent a foreign body from penetrating inside the rear diffuser.
  • dirt such as mud, dust, snow, or any other type of dirt, can not enter the device, and therefore can not interfere with the proper functioning of it.
  • the invention thus makes it possible to reduce the maintenance operations, or the wear of the parts of the device by protecting it from dirt.
  • this secondary panel allows, when the diffuser is in the deployed position, to obstruct a gap that was created with the deployment of the primary panel.
  • the rear bumper retains a harmonious appearance, due to the absence of a gaping hole in the middle of it. This absence of hole improves the overall aesthetics of the vehicle, and consequently improves the quality perceived by the user.
  • the relative positioning of the primary and secondary panels, with a secondary panel which is housed inside the vehicle in the retracted position, allows to have a primary panel over the entire surface of the opening of the bumper. This is advantageous from an aesthetic point of view when the rear diffuser is in the retracted position.
  • the secondary panel being hidden in the retracted position, it is therefore protected from soiling and shocks to which it would otherwise be subjected in this position. It therefore retains a good surface condition, which benefits the aesthetics of the diffuser.
  • the secondary panel performs a simple rotational movement relative to the primary panel when it passes from the retracted position to the deployed position or vice versa.
  • the device since the relative movement of the secondary panel with respect to the primary panel is only a simple rotation, the device is thus simple to operate, which allows a better compactness and a reduction in the total weight of the device as a whole.
  • this rotation of the secondary panel relative to the primary panel allows, when the diffuser is in the retracted position, to press the secondary panel on the primary panel.
  • the space occupied by the diffuser, in the retracted position, when mounted on a vehicle body part is reduced.
  • This kinematic deployment of the secondary panel relative to the primary panel also allows to avoid friction between these two panels, which could to damage. This is particularly advantageous to avoid deterioration of the surfaces of these panels which are visible from outside the vehicle in the retracted or deployed position, and thus preserve an aesthetic appearance thereof.
  • the rear vehicle diffuser may further comprise one or more of the following features, taken alone or in combination:
  • the primary panel does not have a direct mechanical connection with the secondary panel.
  • the device has no mechanical connection between the two panels, which reduces the cost compared to a diffuser which would include one. This further facilitates the maintenance of the diffuser.
  • the secondary panel is connected to the primary panel with at least one rod, the panels never in contact with each other. In this way, there is no friction between the two panels, and therefore there is no deterioration because of these friction.
  • the secondary panel is linked to the first panel by a pivot connection.
  • the secondary panel performs a simple rotation relative to the primary panel.
  • a pivot link is inexpensive and reliable.
  • the rear diffuser comprises a motorized mechanism adapted to allow a deployment and retraction of the primary panel along a path following a combined movement of several simultaneous rotations around different axes of rotation. Such a kinematic deployment of the primary panel combining several rotations allows to place the panel in an optimal deployed position for reducing the drag of the motor vehicle.
  • the rear diffuser in which a motorized mechanism is adapted to allow deployment and retraction of the secondary panel.
  • the secondary panel deploys and retracts along a path following a combined movement of several simultaneous rotations around different axes of rotation.
  • Such multi-rotational secondary panel deployment kinematics allow the panel to be placed in an optimal deployed position to obstruct an opening between the primary panel and a bodywork part. Thus, it makes it possible even better to prevent soiling from penetrating inside the diffuser.
  • the secondary panel deploys and retracts in a path in a simple rotational movement relative to the body part.
  • the panel secondary is mounted on the bumper or the fixed part of the vehicle, for example by a pivot connection, so as to be oriented according to the movement of the connection with the primary panel.
  • the secondary panel thus describes a simple rotational movement relative to the bumper of the vehicle.
  • the secondary panel deploys and retracts along a path in a translation movement relative to the body part.
  • the motorized mechanism comprises an axis of rotation adapted to cause the deployment and retraction of the primary and / or secondary panels.
  • the rear diffuser comprises several primary panels, for example three.
  • the designer has greater freedom in the design of the rear diffuser and in its integration into the overall design of a vehicle on which the diffuser is installed.
  • the device has greater compatibility with a detachable towbar which could be mounted on a vehicle on which the diffuser is installed.
  • the rear diffuser has several secondary panels, for example three. In this way, the designer has greater freedom in the design of the rear diffuser and in its integration into the overall design of a vehicle on which the diffuser is installed. In this way, the device has greater compatibility with a detachable towbar which could be mounted on a vehicle on which the diffuser is installed.
  • the or each primary panel has a general "U" shape.
  • the primary panel at least partially obstructs the lateral openings between the latter and the bodywork part, when the diffuser is in the extended position.
  • the invention also relates to a motor vehicle body part comprising a rear diffuser according to any one of the preceding claims.
  • a motor vehicle body part comprising a rear diffuser according to any one of the preceding claims.
  • This allows to have a complete body part in which is inserted the rear diffuser.
  • an opening between the bodywork part and the rest of a vehicle on which the part would be mounted is protected from dirt of all kinds by the secondary panel of the rear diffuser when the diffuser is deployed.
  • the body part has a more advantageous aesthetic than a body part equipped with a conventional rear diffuser.
  • the bodywork part is a rear bumper.
  • the secondary panel is able to avoid body intrusion strangers between the body part and the primary panel.
  • the rear diffuser is protected from these foreign bodies and can therefore continue to work well even in environments with significant sources of dirt.
  • the primary panel has an outwardly facing face of the vehicle in the extended position and in the retracted position
  • the secondary panel has an outwardly facing face of the vehicle in the deployed position and facing the inside of the vehicle in the retracted position.
  • the secondary panel is invisible from outside the vehicle when the diffuser is in the retracted position.
  • the diffuser integrates perfectly with the design of the vehicle as a whole.
  • the invention also relates to a bodywork part in which the secondary panel performs a simple rotational movement relative to the primary panel when it moves from the retracted position to the deployed position or vice versa, so that said faces do not never be in contact with each other.
  • FIG. 1 is a sectional view along a first plane of a rear lower end of a motor vehicle comprising a rear diffuser according to the invention, the rear diffuser being in the retracted position;
  • FIG. 2 is a sectional view along the first plane of a rear lower end of a motor vehicle comprising a rear diffuser according to the invention, the rear diffuser being in the deployed position;
  • FIG. 3 is a sectional view along the first plane of a rear lower end of a motor vehicle comprising a rear diffuser according to another embodiment of the invention, the rear diffuser being in the retracted position;
  • FIG. 4 is a sectional view along a second plane of a rear lower end of a motor vehicle comprising a rear diffuser according to another embodiment of the invention.
  • FIG. 5 is a sectional view along the second plane of a rear lower end of a motor vehicle comprising a rear diffuser according to another embodiment of the invention.
  • the figures show a rear diffuser in its configuration mounted on a body part of a motor vehicle, specifically a rear bumper of a motor vehicle.
  • FIG. 1 and 2 illustrate a rear diffuser 10, for example made of plastic, of a motor vehicle mounted on a rear bumper 40, for example also made of plastic, comprising a primary panel 20 and at least one secondary panel 30, each of these panels being movable between an extended position (illustrated in FIG. 1) and a retracted position (illustrated in FIG. 2) when the rear diffuser 10 is attached to a vehicle body part (in this case the bumper 40), the secondary panel 30 performing a simple rotational movement relative to the primary panel 20 when it passes from the retracted position to the deployed position or vice versa.
  • the rear diffuser 10 is therefore able to move from a retracted position shown in FIG. 1 to an extended position shown in FIG.
  • the bumper 40 of the vehicle comprises an upper portion 42 and a lower portion 44. An opening 50 is arranged between these two parts of the bumper 40.
  • the primary panel 20 In the retracted position, the primary panel 20 is pressed against the bumper 40 of the vehicle and completely obstructs the opening 50 located therein, located between the upper portion 42 and the lower portion 44.
  • This panel 20 has a concavity on its outer face, here shown facing downwards, relative to the vertical axis z of the vehicle.
  • a secondary panel 30 is connected to the primary panel 20 by a pivot connection 34. This secondary panel 30 is here almost pressed against the primary panel 20, so that the space occupied by the diffuser 10 in the bumper 40 is reduced.
  • the primary panel is actuated by means of a rod system 22.
  • This system comprises several rods (not shown here).
  • This linkage system 22 is itself connected to a motor shaft 62 enabling the primary panel 20 to be set in motion.
  • the secondary panel is actuated by means of a rod system 32.
  • This system 32 may comprise several links (not shown here). ).
  • the linkage system 32 connects the secondary panel 30 with an axis of rotation 62 enabling the secondary panel 30 to be set in motion.
  • the link systems 22, 32 and the motor axis 62 compose an actuating system 60 common to the primary panels 20 and secondary 30.
  • the two panels 20, 30 are actuated through devices using the same motor axis 62, which simplifies the device as a whole.
  • This motor shaft 62 and actuated by an electric motor (not shown here). This allows greater reliability compared to a system in which each panel would be actuated by a different actuator. In addition, this facilitates the maintenance steps or a possible repair of the device.
  • the diffuser 10 may also include different motor axes for actuating the primary panel on the one hand, and the secondary panel on the other hand.
  • the link 32 of the secondary panel 30 may not be connected to a motor axis. Thus, it serves only for guiding the secondary panel 30 between its retracted position and its deployed position. In this case, it is the movement of the primary panel 20 (which is always actuated by the motor axis 62 via the rod 22) which actuates the deployment and retraction of the secondary panel 30 via a force transmission by the intermediate pivot connection 34.
  • the primary panel 20 completely obstructs an opening in the bumper 40, so that the internal space of the diffuser 70, located between the primary panel and the axis motor 62 of the device, is protected from soiling of all kinds, such as mud, snow or dust, or any other type of foreign body to the vehicle.
  • the rod systems 22, 32, as well as the actuating system 60 are also protected.
  • the primary panel 20 when the diffuser 10 is in the deployed position, the primary panel 20 is oriented horizontally and no longer obstructs the opening of the bumper 50 alone.
  • the secondary panel 30 is this time oriented almost perpendicular to the said primary panel 20. It is still connected thereto by a pivot connection 34.
  • the assembly of the secondary panel 30 and the primary panel 20 obstructs, at least partially an opening of the bumper 50.
  • the deployment of the primary panel 20 created three openings, one central between the primary panel and the bumper 50, and two lateral sides (along the Y axis) of the primary panel 20.
  • the secondary panel 30 is obstructing the central opening 50 when the diffuser 10 is in the deployed position.
  • the internal space of the diffuser 70 is actually larger than when the diffuser 10 is in the retracted position.
  • This internal space 70 is protected from dirt from the outside of the vehicle, because the opening of the bumper 50 is obstructed by the primary panel 20 and the secondary panel 30.
  • the primary panel 20 may have a general shape "U" allowing it to obstruct the lateral openings between it and the bumper 50, when the diffuser is in the deployed position.
  • the diffuser 10 In the deployed position, the diffuser 10 is able to direct the air from the underbody of the vehicle towards the rear of the latter, and thus to shift back the points of separation of the air with respect to the vehicle. that is to say the points at which the air no longer follows the bodywork. This helps push back the depression to creating the rear of the vehicle and thus limit the effect of restraint (called “suction effect”) of this depression on the motor vehicle. As a result, the diffuser 10 makes it possible to reduce the drag force when it is deployed.
  • An electric motor (not shown) rotates the axis of rotation of the motorized mechanism 62.
  • This axis of rotation 62 being linked to the deployment rod systems of the primary panel 22, and the secondary panel 32, it therefore causes the activation connecting rods of these systems.
  • the primary panel is moved from its retracted position to its deployed position. It thus performs, by the arrangement of the rod system 22, a trajectory following a combined movement of several simultaneous rotations around different axes of rotation.
  • the deployment link system of the secondary panel 32 is also rotated by the motor shaft 62.
  • the link system 32 which is connected to an attachment point 36 of the secondary panel 30, therefore causes this one in rotation so that it is placed in deployed position.
  • the primary panel 20 which is connected to the secondary panel 30 by a pivot connection 34, drives the latter through this connection 34.
  • the secondary panel 30 performs a simple rotational movement relative to the primary panel 20, but performs in a simultaneous motion consisting of several rotations and translations relative to the rear bumper 40 of the vehicle.
  • the secondary panel 30 is placed so as to obstruct a central opening between the upper part of the bumper 42 and the primary panel 20 of the diffuser.
  • the internal space 70 of the diffuser is sheltered from any dirt that might have been introduced otherwise.
  • dirt such as mud, snow, dust or other does not obstruct the internal space of the diffuser 70, which would prevent the retraction thereof.
  • This particular kinetics of the secondary panel 30 has many advantages. Firstly, the mechanism of retracting and deploying the diffuser 10, namely the motor shaft 62, and the rod systems 22 and 32, are protected from soiling. Thus, the risk of blocking the device is greatly reduced. Similarly, the wear of these mechanical elements is greatly reduced by their protection against soiling. Secondly, the fact that the secondary panel 30 performs only a single rotation relative to the primary panel 20 avoids the penetration of dirt that would prevent the relative movement of one panel relative to the other. If the connection between the two panels 20 and 30 had been for example a slide, it would have been exposed to risks of blockage by insertion of dirt preventing sliding movement. This remark can be made for any diffuser 10 in which the secondary panel 30 would translate with respect to the primary panel 20.
  • a rigid secondary panel 30 which can be painted (especially in the same shade as the rest of the vehicle), gives an aesthetic to the diffuser 10 which is in agreement with the rest of the vehicle.
  • a rigid panel has a much better fatigue strength than if, for example, a flexible element were used.
  • FIGS. 1 and 2 show a diffuser according to another embodiment of the invention in the deployed position.
  • the characteristics of the diffuser which differ from that shown in FIGS. 1 and 2.
  • the secondary panel 30 is not directly connected with the primary panel 20 as before. This connection between the two panels is here achieved by means of at least one rod (not shown).
  • the secondary panel moves with a link guide relative to the primary panel as it moves from the retracted position to the deployed position or vice versa, so that said faces are never in contact with each other. .
  • the secondary panel 30 does not retract in the same direction.
  • the secondary panel 30 is located against the upper part of the bumper 42, instead of being folded against the primary panel 20 as before.
  • the secondary panel 30 remains inside the bumper of the vehicle. When deployed, the secondary panel is in the same position as in the previous embodiment.
  • the secondary panel thus rotates to be placed almost vertically and glued against the upper part of the bumper 42.
  • the gap between the secondary panel 30 and the part upper bumper 42 is very low throughout the retraction (and the same way during deployment).
  • the internal space of the diffuser 70 is therefore very well protected from soiling, even during deployment and retraction.
  • FIG. 4 shows another embodiment of the invention in which the diffuser 10 comprises not only one, but three secondary panels 30.
  • the diffuser 10 comprises not only one, but three secondary panels 30.
  • the characteristics of the diffuser which differ from that presented in FIG. Figures 1 and 2.
  • FIG. 4 is a sectional view along a horizontal plane of the inserted diffuser 10 in a vehicle bumper 40.
  • the rear diffuser 10 is here shown in the deployed position. It can be seen that, as previously, the diffuser 10 has a primary panel 20, the movement is driven by a rod system 22, itself driven by a motor axis 62.
  • these panels are a central secondary panel 30a and two side secondary panels 30b. These side secondary panels 30b are located on either side of the central secondary panel 30a, with reference to the transverse axis Y of the vehicle. These three panels 30 are each connected to the motor spindle 62 of the diffuser 10 by a rod system 32. It can be seen that the presence of three secondary panels 30 allows the diffuser to match the concave shape of the rear bumper vehicle 40, the bumpers of vehicles being often curved shapes, while having three panels 32 each having a low concavity.
  • each secondary panel 30 has its own deployment link system 32.
  • each of these systems 32 is actuated by the same motor axis 62.
  • this diffuser has the same advantages as those developed for the diffuser of the previous embodiment.
  • FIG. 5 shows another embodiment of the invention which differs from the embodiment shown in FIG. 4 in that the secondary panels are not all each connected to a secondary axis of rotation of the motorized mechanism 64.
  • the secondary panels are not all each connected to a secondary axis of rotation of the motorized mechanism 64.
  • the rear diffuser 10 has at least three secondary panels 30.
  • One of these panels is the central secondary panel 30a, and the other two are the side secondary panels 30b, which are located on the side and side panels. other of the central secondary panel 30a, with reference to the transverse axis Y of the vehicle.
  • the secondary panels have an arrangement to match the concave shape of the rear bumper 40.
  • the side secondary panels 30b are connected to secondary rotational axes 64 of the motorized mechanism. There is therefore a secondary axis of rotation of the motorized mechanism 64 by lateral side panel 30b, in addition to the axis of rotation of the motorized mechanism 62.
  • These secondary rotation axes 64 are off-axis with respect to the axis of rotation of the motorized mechanism 62.
  • each secondary axis of rotation 64 is parallel to a main plane of the side secondary panel 30b to which it is connected.
  • This arrangement makes it possible to modify the axis of rotation of the side secondary panel 30b, in order to facilitate storage of this panel 30b in the rear bumper 40, when the diffuser 10 is in the retracted position.
  • the side side panels also better match the concavity of the rear bumper 40. This arrangement is particularly advantageous when the rear bumper 40 has a strong concavity.
  • connection between the secondary rotation axes of the motorized mechanism 64 and the axis of rotation 62 is provided by universal joints 66 disposed therebetween.
  • the axis of rotation 62 can cause the secondary rotation axes of the motor mechanism 64 directly, even if they are off-axis. This makes it possible to drive these secondary axes 64 by means of a single motor driving the axis of rotation 62.
  • the motor can drive only one of the secondary rotation axes of the powered mechanism 64, which causes its turn the axis of rotation 62.
  • the deployment of the side side panels 30b may alternatively be delayed with respect to the deployment of the central subpanel 30a.
  • the central secondary panel 30a deploys first until reaching its deployed position.
  • the side secondary panels 30b are deployed with a delay relative to the central secondary panel 30a.
  • the side secondary panels 30b are pressed against it.
  • the retraction of the side secondary panels 30b takes place in advance of the retraction of the central secondary panel 30a.
  • This sequential deployment kinematics makes it possible to avoid deterioration of the central and lateral 30a and 30b secondary panels by friction of these panels against each other during a simultaneous deployment. Also, it allows the side side panels 30b to flatten against the central secondary panel 30a. In this way, the deployment and retraction movement of the side side panels 30b is not impeded by the deployment and retracting movement of the central subpanel 30a. Thus, the interstices between the central secondary panel 30a and the side secondary panels 30b on the one hand, and between the side secondary panels 30b and the rear bumper 40 on the other hand are clogged effectively.
  • the rear diffuser can, instead of being inserted into an aperture of the rear bumper of the vehicle, be inserted between a rear bumper and a sill of the vehicle.

Abstract

A rear diffuser (10) of a motor vehicle, comprising a primary panel (20) and at least one secondary panel (30), each of these panels (20, 30) being movable between a deployed position and a retracted position when the rear diffuser (10) is attached to a vehicle bodywork part. When the bodywork part is attached to a motor vehicle, the secondary panel (30) is completely invisible from the outside in the retracted position, and blocks the opening (50) between the bodywork part and the primary panel (20) in the deployed position.

Description

Diffuseur arrière mobile de véhicule automobile à panneaux multiples  Multi-panel automotive rear-wheel vehicle diffuser
L'invention concerne les diffuseurs arrière de véhicules automobiles et plus particulièrement les diffuseurs arrière mobiles. The invention relates to the rear diffusers of motor vehicles and more particularly the movable rear diffusers.
Le diffuseur arrière est une pièce pouvant être présente à l'arrière d'un véhicule automobile, plus précisément sous le châssis ou bien en partie basse du pare-chocs, et ayant pour but d'améliorer les performances aérodynamiques du véhicule. Il peut par exemple s'agir d'améliorer l'appui au sol du véhicule.  The rear diffuser is a part that can be present in the rear of a motor vehicle, more precisely under the frame or in the lower part of the bumper, and for the purpose of improving the aerodynamic performance of the vehicle. It may for example be to improve the ground support of the vehicle.
Certains diffuseurs permettent quant à eux d'améliorer les performances aérodynamiques du véhicule en réduisant la traînée du véhicule, c'est-à-dire la force s'opposant au mouvement du véhicule dans l'air. Il s'agit de décaler vers l'arrière les points de décollement de l'air par rapport au véhicule, c'est-à-dire les points au niveau desquels l'air ne suit plus la carrosserie. Cela permet de repousser vers l'arrière la dépression se créant à l'arrière du véhicule et ainsi limiter l'effet de retenue (appelé « effet de succion ») de cette dépression sur le véhicule automobile.  Some diffusers allow them to improve the aerodynamic performance of the vehicle by reducing the drag of the vehicle, that is to say the force opposing the movement of the vehicle in the air. It is a question of shifting back the points of separation of the air with respect to the vehicle, that is to say the points at which the air does not follow the body any more. This allows to push back the depression created at the rear of the vehicle and thus limit the effect of restraint (called "suction effect") of this depression on the motor vehicle.
Les solutions actuelles consistent en un diffuseur arrière comprenant un panneau mobile en rotation entre une position rétractée et une position déployée lorsque le véhicule est en mouvement. La rotation de la position déployée à la position rétractée permet de repousser vers l'arrière les points de décollement de l'air et ainsi réduire la traînée du véhicule automobile comme expliqué auparavant. Le panneau mobile est déployé à partir d'une certaine vitesse afin de diminuer la traînée du véhicule et est replié à haute vitesse.  Current solutions consist of a rear diffuser comprising a panel movable in rotation between a retracted position and an extended position when the vehicle is in motion. The rotation of the deployed position to the retracted position makes it possible to push back the air separation points and thus reduce the drag of the motor vehicle as explained previously. The mobile panel is deployed from a certain speed to reduce vehicle drag and is folded at high speed.
Ce dispositif permet efficacement de réduire la traînée du véhicule. Cependant, dans sa position déployée, le diffuseur laisse apparaître des ouvertures importantes entre le panneau mobile et le pare-chocs arrière du véhicule. En effet, il apparaît une ouverture centrale entre la pièce de carrosserie et le panneau du diffuseur, ainsi que deux ouvertures latérales de chaque côté du panneau. La présence de ces ouvertures entraîne plusieurs inconvénients. Premièrement, ces ouvertures peuvent laisser pénétrer de nombreux types de corps étrangers dans le dispositif. Ces corps étrangers peuvent être de la poussière, de la boue, la neige par temps d'hiver, ou tout autre type de salissure. Ces corps étrangers peuvent, en quantité suffisante, bloquer la fermeture du dispositif. En cas de boue ou de neige, le diffuseur peut ainsi être bloqué en position déployée. De même, de la poussière peut venir encrasser puis endommager les éléments mécaniques nécessaires au déploiement et à la rétractation du panneau mobile. Ainsi bloqué en position déployée ou fermée, le diffuseur ne peut plus améliorer les performances aérodynamiques du véhicule, et nécessite une maintenance et/ou un remplacement qui peuvent être coûteux. Ensuite, ces ouvertures peuvent être perçues comme étant disgracieuses pour l'automobiliste, car nuisant à l'esthétique générale du véhicule. Ainsi, un tel dispositif peut nuire à la qualité perçue du véhicule dans son ensemble. This device effectively reduces the drag of the vehicle. However, in its deployed position, the diffuser reveals major openings between the movable panel and the rear bumper of the vehicle. Indeed, it appears a central opening between the body part and the diffuser panel, and two side openings on each side of the panel. The presence of these openings has several disadvantages. First, these openings may allow many types of foreign bodies to enter the device. These foreign bodies can be dust, mud, snow in winter weather, or any other type of dirt. These foreign bodies can, in sufficient quantity, block the closure of the device. In case of mud or snow, the diffuser can be locked in the deployed position. Similarly, dust can become dirty and damage the mechanical elements necessary for deployment and retraction of the mobile panel. Thus blocked in the deployed or closed position, the diffuser can no longer improve the aerodynamic performance of the vehicle, and requires maintenance and / or replacement that can be expensive. Then these openings can be perceived as being unsightly for the motorist, as detrimental to the overall aesthetics of the vehicle. Thus, such a device can affect the perceived quality of the vehicle as a whole.
Une autre solution consiste à utiliser un composant de couverture souple entre le panneau mobile du diffuseur et le pare-chocs du véhicule. Ce composant permet d'obstruer le vide laissé lorsque le diffuseur est déployé. Par contre, un tel dispositif n'est pas optimal car de la salissure (neige, boue ou autre) peut se glisser dans les plis du composant souple lorsque le diffuseur se rétracte, pouvant provoquer un blocage du diffuseur. De plus, l'aspect extérieur d'un tel composant souple peut nuire à la qualité perçue par l'utilisateur et détériorer l'esthétique du véhicule. Ce composant peut aussi vibrer plus facilement qu'un panneau rigide et provoquer des nuisances sonores. Enfin, un tel composant flexible possède une faible résistance à la fatigue provoquée par de nombreux cycles d'ouverture et fermeture du panneau.  Another solution is to use a soft cover component between the movable panel of the diffuser and the bumper of the vehicle. This component closes the void left when the diffuser is deployed. By cons, such a device is not optimal because of dirt (snow, mud or other) can slip into the folds of the flexible component when the diffuser retracts, which can cause a blockage of the diffuser. In addition, the appearance of such a flexible component can adversely affect the quality perceived by the user and deteriorate the aesthetics of the vehicle. This component can also vibrate more easily than a rigid panel and cause noise. Finally, such a flexible component has a low resistance to fatigue caused by many cycles of opening and closing the panel.
Une autre solution, décrite notamment dans le document US 2017/0036710, consiste à utiliser deux panneaux guidés chacun en rotation par rapport à la pièce de carrosserie sur laquelle ils sont fixés chacun par l'une de leurs extrémités. Le premier panneau agit en tant que diffuseur et le deuxième sert à obstruer l'ouverture centrale entre le premier et la carrosserie. Les deux panneaux frottent l'un contre l'autre lors du déploiement et de la rétractation, ce qui use leurs surfaces en contact et nie à l'aspect esthétique du diffuseur. De plus, le deuxième panneau est visible en position rétractée, ce qui nuit aussi à l'esthétique du véhicule.  Another solution, described in particular in the document US 2017/0036710, consists in using two panels each guided in rotation relative to the bodywork part to which they are each fixed by one of their ends. The first panel acts as a diffuser and the second serves to obstruct the central opening between the first and the body. The two panels rub against each other during deployment and retraction, which wears their surfaces in contact and denies the aesthetic appearance of the diffuser. In addition, the second panel is visible in the retracted position, which also affects the aesthetics of the vehicle.
L'invention a pour but de remédier à ces inconvénients en fournissant un diffuseur arrière de véhicule ne s'encrassant pas, et ainsi limitant les risques de panne du dispositif. L'invention a aussi pour but de fournir un diffuseur arrière de véhicule ne nuisant pas à l'esthétique du véhicule (en particulier en position déployée), n'ayant ainsi pas d'impact néfaste sur la qualité perçue par l'automobiliste.  The invention aims to overcome these disadvantages by providing a vehicle rear diffuser does not clog, and thus limiting the risk of failure of the device. The invention also aims to provide a vehicle rear diffuser does not detract from the aesthetics of the vehicle (particularly in the deployed position), thus having no adverse impact on the quality perceived by the motorist.
L'invention a pour objet un diffuseur arrière de véhicule automobile comprenant un panneau primaire et au moins un panneau secondaire, chacun de ces panneaux étant mobile entre une position déployée et une position rétractée lorsque le diffuseur arrière est fixé sur une pièce de carrosserie de véhicule, caractérisé en ce que, lorsque la pièce de carrosserie est fixée sur un véhicule automobile, le panneau secondaire est complètement non visible de l'extérieur en position rétractée et obstrue, au moins partiellement, une ouverture entre la pièce de carrosserie et le panneau primaire en position déployée.  The invention relates to a rear diffuser of a motor vehicle comprising a primary panel and at least one secondary panel, each of these panels being movable between an extended position and a retracted position when the rear diffuser is fixed on a vehicle bodywork part , characterized in that, when the bodywork part is fixed to a motor vehicle, the secondary panel is completely invisible from the outside in the retracted position and at least partially obstructs an opening between the bodywork part and the primary panel in the deployed position.
Ainsi, le panneau secondaire du diffuseur est protégé des salissures lorsque le diffuseur est en position rétractée. Ainsi, le panneau secondaire vient obstruer, au moins partiellement une ouverture créée lors du déploiement entre le panneau primaire et le reste du pare-chocs arrière du véhicule. Lors du son déploiement, trois ouvertures sont créées, une centrale entre le panneau primaire et la pièce de carrosserie, et deux latérales situées sur les côtés du panneau primaire. Ici, le panneau secondaire vient obstruer l'ouverture centrale. L'occupation de cette ouverture par le panneau secondaire permet d'empêcher un corps étranger de pénétrer à l'intérieur du diffuseur arrière. Ainsi, des salissures comme de la boue, de la poussière, de la neige, ou tout autre type de salissures, ne peuvent pas pénétrer dans le dispositif, et donc ne peuvent venir gêner le bon fonctionnement de celui-ci. L'invention permet donc de diminuer les opérations de maintenance, ou l'usure des pièces du dispositif en le protégeant des salissures. Thus, the secondary panel of the diffuser is protected from soiling when the diffuser is in the retracted position. Thus, the secondary panel obstructs, at least partially an opening created during deployment between the primary panel and the rest of the rear bumper of the vehicle. When it is deployed, three openings are created, a central between the primary panel and the bodywork part, and two sideways located on the sides of the primary panel. Here, the secondary panel obstructs the central opening. The occupation of this opening by the secondary panel makes it possible to prevent a foreign body from penetrating inside the rear diffuser. Thus, dirt such as mud, dust, snow, or any other type of dirt, can not enter the device, and therefore can not interfere with the proper functioning of it. The invention thus makes it possible to reduce the maintenance operations, or the wear of the parts of the device by protecting it from dirt.
De plus, la présence de ce panneau secondaire permet, lorsque le diffuseur est en position déployée, d'obstruer un interstice qui s'est créé avec le déploiement du panneau primaire. De cette manière, le pare-chocs arrière conserve une apparence harmonieuse, de par l'absence d'un trou béant en en plein milieu de celui-ci. Cette absence de trou permet d'améliorer l'esthétique globale du véhicule, et permet par voie de conséquence de bonifier la qualité perçue par l'utilisateur.  In addition, the presence of this secondary panel allows, when the diffuser is in the deployed position, to obstruct a gap that was created with the deployment of the primary panel. In this way, the rear bumper retains a harmonious appearance, due to the absence of a gaping hole in the middle of it. This absence of hole improves the overall aesthetics of the vehicle, and consequently improves the quality perceived by the user.
Enfin, le positionnement relatif des panneaux primaire et secondaire, avec un panneau secondaire qui se loge à l'intérieur du véhicule en position rétractée, permet d'avoir un panneau primaire sur toute la surface de l'ouverture du pare-chocs. Ceci est avantageux d'un point de vue esthétique lorsque le diffuseur arrière est en position rétractée.. De plus, le panneau secondaire étant caché en position rétractée, il est donc protégé des salissures et des chocs auxquels il serait autrement soumis dans cette position. Il conserve donc un bon état de surface, ce qui profite à l'esthétique du diffuseur.  Finally, the relative positioning of the primary and secondary panels, with a secondary panel which is housed inside the vehicle in the retracted position, allows to have a primary panel over the entire surface of the opening of the bumper. This is advantageous from an aesthetic point of view when the rear diffuser is in the retracted position. In addition, the secondary panel being hidden in the retracted position, it is therefore protected from soiling and shocks to which it would otherwise be subjected in this position. It therefore retains a good surface condition, which benefits the aesthetics of the diffuser.
Avantageusement, le panneau secondaire effectue un mouvement de rotation simple par rapport au panneau primaire lorsqu'il passe de la position rétractée à la position déployée ou inversement.  Advantageously, the secondary panel performs a simple rotational movement relative to the primary panel when it passes from the retracted position to the deployed position or vice versa.
Ainsi, comme le mouvement relatif du panneau secondaire par rapport au panneau primaire n'est qu'une rotation simple, le dispositif est donc simple à actionner, ce qui permet une meilleure compacité et une réduction du poids total du dispositif dans son ensemble. De plus, cette rotation du panneau secondaire par rapport au panneau primaire permet, lorsque le diffuseur est en position rétractée, de plaquer le panneau secondaire sur le panneau primaire. Ainsi, l'espace occupé par le diffuseur, en position rétractée, lorsqu'il est monté sur une pièce de carrosserie de véhicule, en est réduit. Cette cinématique de déploiement du panneau secondaire par rapport au panneau primaire permet de plus d'éviter un frottement entre ces deux panneaux, qui pourrait les endommager. Cela est particulièrement avantageux pour éviter une détérioration des surfaces de ces panneaux qui sont visibles depuis l'extérieur du véhicule en position rétractée ou déployée, et ainsi préserver un aspect esthétique de celles-ci. Thus, since the relative movement of the secondary panel with respect to the primary panel is only a simple rotation, the device is thus simple to operate, which allows a better compactness and a reduction in the total weight of the device as a whole. In addition, this rotation of the secondary panel relative to the primary panel allows, when the diffuser is in the retracted position, to press the secondary panel on the primary panel. Thus, the space occupied by the diffuser, in the retracted position, when mounted on a vehicle body part, is reduced. This kinematic deployment of the secondary panel relative to the primary panel also allows to avoid friction between these two panels, which could to damage. This is particularly advantageous to avoid deterioration of the surfaces of these panels which are visible from outside the vehicle in the retracted or deployed position, and thus preserve an aesthetic appearance thereof.
Le diffuseur arrière de véhicule peut en outre comporter l'une ou plusieurs des caractéristiques suivantes, prises seules ou en combinaison :  The rear vehicle diffuser may further comprise one or more of the following features, taken alone or in combination:
- le panneau primaire est dépourvu d'une liaison mécanique directe avec le panneau secondaire. De cette manière, le dispositif ne comporte de liaison mécanique entre les deux panneaux, ce qui réduit le coût par rapport à un diffuseur qui en comporterait une. Cela facilite de plus la maintenance du diffuseur.  the primary panel does not have a direct mechanical connection with the secondary panel. In this way, the device has no mechanical connection between the two panels, which reduces the cost compared to a diffuser which would include one. This further facilitates the maintenance of the diffuser.
- le panneau secondaire est lié au panneau primaire à l'aide d'au moins une biellette, les panneaux n'étant jamais en contact l'un avec l'autre. De cette façon, il n'y a pas de frottement entre les deux panneaux, et donc il n'y a pas de détérioration en raison de ces frottements.  - The secondary panel is connected to the primary panel with at least one rod, the panels never in contact with each other. In this way, there is no friction between the two panels, and therefore there is no deterioration because of these friction.
- le panneau secondaire est lié au premier panneau par une liaison pivot. De cette manière, le panneau secondaire effectue bien une rotation simple par rapport au panneau primaire. De plus, une liaison pivot est peu coûteuse et fiable.  - The secondary panel is linked to the first panel by a pivot connection. In this way, the secondary panel performs a simple rotation relative to the primary panel. In addition, a pivot link is inexpensive and reliable.
- le déploiement et la rétractation du panneau secondaire sont actionnés par le mouvement du panneau primaire via une transmission (passive) d'efforts par la liaison pivot. Ainsi, l'actionnement du panneau secondaire par le panneau primaire permet de produire un système meilleur marché car nécessitant peu de pièces.  - Deployment and retraction of the secondary panel are actuated by the movement of the primary panel via transmission (passive) efforts by the pivot connection. Thus, the actuation of the secondary panel by the primary panel can produce a cheaper system because requiring few parts.
- le diffuseur arrière comprend un mécanisme motorisé apte à permettre un déploiement et une rétractation du panneau primaire selon une trajectoire suivant un mouvement combiné de plusieurs rotations simultanées autour de différents axes de rotation. Une telle cinématique de déploiement du panneau primaire combinant plusieurs rotations permet de placer le panneau dans une position déployée optimale pour la réduction de la traînée du véhicule automobile.  - The rear diffuser comprises a motorized mechanism adapted to allow a deployment and retraction of the primary panel along a path following a combined movement of several simultaneous rotations around different axes of rotation. Such a kinematic deployment of the primary panel combining several rotations allows to place the panel in an optimal deployed position for reducing the drag of the motor vehicle.
- le diffuseur arrière dans lequel un mécanisme motorisé est apte à permettre un déploiement et une rétractation du panneau secondaire.  - The rear diffuser in which a motorized mechanism is adapted to allow deployment and retraction of the secondary panel.
- le panneau secondaire se déploie et se rétracte selon une trajectoire suivant un mouvement combiné de plusieurs rotations simultanées autour de différents axes de rotation. Une telle cinématique de déploiement du panneau secondaire combinant plusieurs rotations permet de placer le panneau dans une position déployée optimale pour obstruer une ouverture entre le panneau primaire et une pièce de carrosserie. Ainsi, il permet de mieux encore empêcher les salissures de pénétrer à l'intérieur du diffuseur.  - The secondary panel deploys and retracts along a path following a combined movement of several simultaneous rotations around different axes of rotation. Such multi-rotational secondary panel deployment kinematics allow the panel to be placed in an optimal deployed position to obstruct an opening between the primary panel and a bodywork part. Thus, it makes it possible even better to prevent soiling from penetrating inside the diffuser.
- le panneau secondaire se déploie et se rétracte selon une trajectoire suivant un mouvement de rotation simple par rapport à la pièce de carrosserie. Le panneau secondaire est donc monté sur le pare-chocs ou la partie fixe du véhicule, par exemple par une liaison pivot, de manière à pouvoir s'orienter selon le mouvement de la liaison avec le panneau primaire. Le panneau secondaire décrit donc un mouvement de rotation simple par rapport au pare-chocs du véhicule. - The secondary panel deploys and retracts in a path in a simple rotational movement relative to the body part. The panel secondary is mounted on the bumper or the fixed part of the vehicle, for example by a pivot connection, so as to be oriented according to the movement of the connection with the primary panel. The secondary panel thus describes a simple rotational movement relative to the bumper of the vehicle.
- le panneau secondaire se déploie et se rétracte selon une trajectoire suivant un mouvement de translation par rapport à la pièce de carrosserie.  - The secondary panel deploys and retracts along a path in a translation movement relative to the body part.
- le déploiement et la rétractation des panneaux primaire et secondaire est assuré par le même mécanisme. De cette manière, le coût du diffuseur arrière est très réduit par rapport à un diffuseur qui comprendrait un mécanisme distinct pour chaque panneau. De même, le poids et l'encombrement du diffuseur en sont réduits.  - The deployment and retraction of the primary and secondary panels is provided by the same mechanism. In this way, the cost of the rear diffuser is very small compared to a diffuser which would include a separate mechanism for each panel. Similarly, the weight and size of the diffuser are reduced.
- le mécanisme motorisé comporte un axe de rotation apte à entraîner le déploiement et la rétractation des panneaux primaire et/ou secondaire.  - The motorized mechanism comprises an axis of rotation adapted to cause the deployment and retraction of the primary and / or secondary panels.
- le diffuseur arrière comporte plusieurs panneaux primaires, par exemple trois. De cette manière, le concepteur dispose d'une plus grande liberté dans la conception du diffuseur arrière et dans son intégration dans le design général d'un véhicule sur lequel le diffuseur est installé. De cette manière, le dispositif possède une plus grande compatibilité avec un crochet d'attelage amovible qui pourrait être monté sur un véhicule sur lequel le diffuseur est installé.  the rear diffuser comprises several primary panels, for example three. In this way, the designer has greater freedom in the design of the rear diffuser and in its integration into the overall design of a vehicle on which the diffuser is installed. In this way, the device has greater compatibility with a detachable towbar which could be mounted on a vehicle on which the diffuser is installed.
- le diffuseur arrière comporte plusieurs panneaux secondaires, par exemple trois. De cette manière, le concepteur dispose d'une plus grande liberté dans la conception du diffuseur arrière et dans son intégration dans le design général d'un véhicule sur lequel le diffuseur est installé. De cette manière, le dispositif possède une plus grande compatibilité avec un crochet d'attelage amovible qui pourrait être monté sur un véhicule sur lequel le diffuseur est installé.  - The rear diffuser has several secondary panels, for example three. In this way, the designer has greater freedom in the design of the rear diffuser and in its integration into the overall design of a vehicle on which the diffuser is installed. In this way, the device has greater compatibility with a detachable towbar which could be mounted on a vehicle on which the diffuser is installed.
- le ou chaque panneau primaire a une forme générale en « U ». De cette manière, le panneau primaire obstrue au moins partiellement les ouvertures latérales entre celui- ci et la pièce de carrosserie, lorsque le diffuseur est en position déployée.  the or each primary panel has a general "U" shape. In this way, the primary panel at least partially obstructs the lateral openings between the latter and the bodywork part, when the diffuser is in the extended position.
L'invention a aussi pour objet une pièce de carrosserie de véhicule automobile comprenant un diffuseur arrière selon l'une quelconque des revendications précédentes. Cela permet d'avoir une pièce de carrosserie complète dans laquelle est inséré le diffuseur arrière. Ainsi, une ouverture comprise entre la pièce de carrosserie et le reste d'un véhicule sur lequel la pièce serait montée, est protégée des salissures de toutes sortes par le panneau secondaire du diffuseur arrière lorsque le diffuseur est déployé. De plus, la pièce de carrosserie possède une esthétique plus avantageuse qu'une pièce de carrosserie équipée d'un diffuseur arrière classique.  The invention also relates to a motor vehicle body part comprising a rear diffuser according to any one of the preceding claims. This allows to have a complete body part in which is inserted the rear diffuser. Thus, an opening between the bodywork part and the rest of a vehicle on which the part would be mounted, is protected from dirt of all kinds by the secondary panel of the rear diffuser when the diffuser is deployed. In addition, the body part has a more advantageous aesthetic than a body part equipped with a conventional rear diffuser.
Avantageusement, la pièce de carrosserie est un pare-chocs arrière.  Advantageously, the bodywork part is a rear bumper.
Avantageusement, le panneau secondaire est apte éviter l'intrusion de corps étrangers entre la pièce de carrosserie et le panneau primaire. Ainsi, le diffuseur arrière est protégé de ces corps étrangers et peut donc continuer à fonctionner de bonne manière même dans des environnements présentant des sources de salissures importantes. Advantageously, the secondary panel is able to avoid body intrusion strangers between the body part and the primary panel. Thus, the rear diffuser is protected from these foreign bodies and can therefore continue to work well even in environments with significant sources of dirt.
Avantageusement, le panneau primaire comporte une face tournée vers l'extérieur du véhicule en position déployée et en position rétractée, le panneau secondaire comporte une face tournée vers l'extérieur du véhicule en position déployée et tournée vers l'intérieur du véhicule en position rétractée.  Advantageously, the primary panel has an outwardly facing face of the vehicle in the extended position and in the retracted position, the secondary panel has an outwardly facing face of the vehicle in the deployed position and facing the inside of the vehicle in the retracted position. .
Avantageusement, le panneau secondaire est non-visible depuis l'extérieur du véhicule lorsque le diffuseur est en position rétractée. De ce fait, le diffuseur s'intègre parfaitement au design du véhicule dans son ensemble.  Advantageously, the secondary panel is invisible from outside the vehicle when the diffuser is in the retracted position. As a result, the diffuser integrates perfectly with the design of the vehicle as a whole.
L'invention a aussi pour objet une pièce de carrosserie dans laquelle le panneau secondaire effectue un mouvement de rotation simple par rapport au panneau primaire lorsqu'il passe de la position rétractée à la position déployée ou inversement, de façon à ce que lesdites faces ne soient jamais en contact l'une de l'autre.  The invention also relates to a bodywork part in which the secondary panel performs a simple rotational movement relative to the primary panel when it moves from the retracted position to the deployed position or vice versa, so that said faces do not never be in contact with each other.
L'invention sera mieux comprise à la lecture des figures annexées, qui sont fournies à titre d'exemple et ne présentent aucun caractère limitatif, dans lesquelles :  The invention will be better understood on reading the appended figures, which are provided by way of example and are in no way limiting, in which:
- la figure 1 est une vue en coupe suivant un premier plan d'une extrémité inférieure arrière d'un véhicule automobile comprenant un diffuseur arrière selon l'invention, le diffuseur arrière étant en position rétractée ;  - Figure 1 is a sectional view along a first plane of a rear lower end of a motor vehicle comprising a rear diffuser according to the invention, the rear diffuser being in the retracted position;
- la figure 2 est une vue en coupe suivant le premier plan d'une extrémité inférieure arrière d'un véhicule automobile comprenant un diffuseur arrière selon l'invention, le diffuseur arrière étant en position déployée ;  - Figure 2 is a sectional view along the first plane of a rear lower end of a motor vehicle comprising a rear diffuser according to the invention, the rear diffuser being in the deployed position;
- La figure 3 est une vue en coupe suivant le premier plan d'une extrémité inférieure arrière d'un véhicule automobile comprenant un diffuseur arrière selon un autre mode de réalisation de l'invention, le diffuseur arrière étant en position rétractée ;  - Figure 3 is a sectional view along the first plane of a rear lower end of a motor vehicle comprising a rear diffuser according to another embodiment of the invention, the rear diffuser being in the retracted position;
- La figure 4 est une vue en coupe suivant un deuxième plan d'une extrémité inférieure arrière d'un véhicule automobile comprenant un diffuseur arrière selon une autre mode de réalisation de l'invention ; et  - Figure 4 is a sectional view along a second plane of a rear lower end of a motor vehicle comprising a rear diffuser according to another embodiment of the invention; and
- La figure 5 est une vue en coupe suivant le deuxième plan d'une extrémité inférieure arrière d'un véhicule automobile comprenant un diffuseur arrière selon une autre mode de réalisation de l'invention.  - Figure 5 is a sectional view along the second plane of a rear lower end of a motor vehicle comprising a rear diffuser according to another embodiment of the invention.
Les figures représentent un diffuseur arrière dans sa configuration montée sur une pièce de carrosserie de véhicule automobile, plus précisément un pare-chocs arrière de véhicule automobile.  The figures show a rear diffuser in its configuration mounted on a body part of a motor vehicle, specifically a rear bumper of a motor vehicle.
Par la suite, les termes tels que « axe longitudinal X », « axe transversal Y », « axe vertical Z », « avant », « arrière », « au- dessus », « supérieur », « en-dessous », « inférieur », etc. s'entendent par référence à l'orientation usuelle des véhicules automobiles selon le repère représenté sur la figure 1 et sur la figure 4. Subsequently, the terms such as "longitudinal axis X", "transverse axis Y", "vertical axis Z", "front", "rear", "above", "upper", "below", " lower ", etc. are understood by reference to the usual orientation of motor vehicles according to the reference shown in Figure 1 and Figure 4.
Les figures 1 et 2 illustrent un diffuseur arrière 10, par exemple réalisé en matière plastique, de véhicule automobile monté sur un pare-chocs arrière 40, par exemple lui aussi réalisé en matière plastique, comprenant un panneau primaire 20 et au moins un panneau secondaire 30, chacun de ces panneaux étant mobile entre une position déployée (illustrée en figure 1 ) et une position rétractée (illustrée en figure 2) lorsque le diffuseur arrière 10 est fixé sur une pièce de carrosserie de véhicule (dans ce cas le pare-chocs arrière 40), le panneau secondaire 30 effectuant un mouvement de rotation simple par rapport au panneau primaire 20 lorsqu'il passe de la position rétractée à la position déployée ou inversement.  Figures 1 and 2 illustrate a rear diffuser 10, for example made of plastic, of a motor vehicle mounted on a rear bumper 40, for example also made of plastic, comprising a primary panel 20 and at least one secondary panel 30, each of these panels being movable between an extended position (illustrated in FIG. 1) and a retracted position (illustrated in FIG. 2) when the rear diffuser 10 is attached to a vehicle body part (in this case the bumper 40), the secondary panel 30 performing a simple rotational movement relative to the primary panel 20 when it passes from the retracted position to the deployed position or vice versa.
Le diffuseur arrière 10 est donc apte à passer d'une position rétractée représentée à la figure 1 à une position déployée représentée en figure 2.  The rear diffuser 10 is therefore able to move from a retracted position shown in FIG. 1 to an extended position shown in FIG.
Le pare-chocs 40 du véhicule comprend une partie supérieure 42 et une partie inférieure 44. Une ouverture 50 est aménagée entre ces deux parties du pare-chocs 40. En position rétractée, le panneau primaire 20 est plaqué contre le pare-chocs 40 du véhicule et obstrue complètement l'ouverture 50 située dans celui-ci, située entre la partie supérieure 42 et la partie inférieure 44. Ce panneau 20 présente une concavité sur sa face externe, ici représentée orientée vers le bas, relativement à l'axe vertical z du véhicule. Un panneau secondaire 30 est lié au panneau primaire 20 par une liaison pivot 34. Ce panneau secondaire 30 est ici quasiment plaqué contre le panneau primaire 20, de sorte que l'espace occupé par le diffuseur 10 dans le pare-chocs 40 est réduit.  The bumper 40 of the vehicle comprises an upper portion 42 and a lower portion 44. An opening 50 is arranged between these two parts of the bumper 40. In the retracted position, the primary panel 20 is pressed against the bumper 40 of the vehicle and completely obstructs the opening 50 located therein, located between the upper portion 42 and the lower portion 44. This panel 20 has a concavity on its outer face, here shown facing downwards, relative to the vertical axis z of the vehicle. A secondary panel 30 is connected to the primary panel 20 by a pivot connection 34. This secondary panel 30 is here almost pressed against the primary panel 20, so that the space occupied by the diffuser 10 in the bumper 40 is reduced.
Le panneau primaire est actionné grâce à un système à biellettes 22. Ce système comporte plusieurs biellettes (non représentées ici). Ce système à biellettes 22 est lui- même relié à un axe moteur 62 permettant la mise en mouvement du panneau primaire 20. Le panneau secondaire est lui actionné grâce à un système à biellettes 32. Ce système 32 peut comporter plusieurs biellettes (non représentées ici). Le système à biellettes 32 relie le panneau secondaire 30 avec un l'axe de rotation 62 permettant la mise en mouvement du panneau secondaire 30. Les systèmes à biellettes 22, 32 et l'axe moteur 62 composent un système d'actionnement 60 commun aux panneaux primaire 20 et secondaire 30. Ainsi, les deux panneaux 20, 30 sont actionnés grâce à des dispositifs utilisant le même axe de moteur 62, ce qui permet de simplifier le dispositif dans son ensemble. Cet axe moteur 62 et actionné par un moteur électrique (non représenté ici). Ceci permet une plus grande fiabilité par rapport à un système dans lequel chaque panneau serait actionné par un actionneur différent. De plus, cela permet de faciliter les étapes de maintenance ou une éventuelle réparation du dispositif. Toutefois, le diffuseur 10 peut aussi comporter des axes moteurs différents permettant l'actionnement du panneau primaire d'une part, et du panneau secondaire d'autre part. The primary panel is actuated by means of a rod system 22. This system comprises several rods (not shown here). This linkage system 22 is itself connected to a motor shaft 62 enabling the primary panel 20 to be set in motion. The secondary panel is actuated by means of a rod system 32. This system 32 may comprise several links (not shown here). ). The linkage system 32 connects the secondary panel 30 with an axis of rotation 62 enabling the secondary panel 30 to be set in motion. The link systems 22, 32 and the motor axis 62 compose an actuating system 60 common to the primary panels 20 and secondary 30. Thus, the two panels 20, 30 are actuated through devices using the same motor axis 62, which simplifies the device as a whole. This motor shaft 62 and actuated by an electric motor (not shown here). This allows greater reliability compared to a system in which each panel would be actuated by a different actuator. In addition, this facilitates the maintenance steps or a possible repair of the device. However, the diffuser 10 may also include different motor axes for actuating the primary panel on the one hand, and the secondary panel on the other hand.
Alternativement, la biellette 32 du panneau secondaire 30 peut ne pas être reliée à un axe moteur. Ainsi, elle ne sert que pour le guidage du panneau secondaire 30 entre sa position rétractée et sa position déployée. Dans ce cas, c'est le mouvement du panneau primaire 20 (qui lui est toujours actionné par l'axe moteur 62 via la biellette 22) qui actionne le déploiement et la rétractation du panneau secondaire 30 via une transmission d'effort par l'intermédiaire de la liaison pivot 34.  Alternatively, the link 32 of the secondary panel 30 may not be connected to a motor axis. Thus, it serves only for guiding the secondary panel 30 between its retracted position and its deployed position. In this case, it is the movement of the primary panel 20 (which is always actuated by the motor axis 62 via the rod 22) which actuates the deployment and retraction of the secondary panel 30 via a force transmission by the intermediate pivot connection 34.
Comme montré en figure 1 , lorsque le diffuseur est en position rétractée, le panneau primaire 20 obstrue complètement une ouverture située dans le pare-chocs 40, de sorte que l'espace interne du diffuseur 70, situé entre le panneau primaire et l'axe moteur 62 du dispositif, est protégé des salissures de toutes sortes, telles que de la boue, de la neige ou de poussière, ou de tout autre type de corps étranger au véhicule. Les systèmes à biellettes 22, 32, ainsi que le système d'actionnement 60 en sont eux aussi protégés.  As shown in FIG. 1, when the diffuser is in the retracted position, the primary panel 20 completely obstructs an opening in the bumper 40, so that the internal space of the diffuser 70, located between the primary panel and the axis motor 62 of the device, is protected from soiling of all kinds, such as mud, snow or dust, or any other type of foreign body to the vehicle. The rod systems 22, 32, as well as the actuating system 60 are also protected.
Comme montré en figure 2, lorsque le diffuseur 10 est en position déployée, le panneau primaire 20 est orienté horizontalement et n'obstrue plus à lui seul l'ouverture du pare-chocs 50. Le panneau secondaire 30 est cette fois orienté quasiment perpendiculairement au dit panneau primaire 20. Il est toujours lié à celui-ci par une liaison pivot 34. L'ensemble du panneau secondaire 30 et du panneau primaire 20 obstrue, au moins partiellement une ouverture du pare-chocs 50. Le déploiement du panneau primaire 20 créé trois ouvertures, l'une centrale entre le panneau primaire et le pare-chocs 50, ainsi que deux latérales situées sur les côtés (suivant l'axe Y) du panneau primaire 20. Le panneau secondaire 30 vient obstruer l'ouverture centrale 50, lorsque le diffuseur 10 est en position déployée. Dans cette position, l'espace interne du diffuseur 70 est de fait plus grand que lorsque le diffuseur 10 est en position rétractée. Cet espace interne 70, est à l'abri des salissures provenant du milieu extérieur au véhicule, car l'ouverture du pare-chocs 50 est bien obstruée par le panneau primaire 20 et le panneau secondaire 30. De manière avantageuse, le panneau primaire 20 peut posséder une forme générale en « U » lui permettant d'obstruer les ouvertures latérales entre celui-ci et le pare-chocs 50, lorsque le diffuseur est en position déployée.  As shown in FIG. 2, when the diffuser 10 is in the deployed position, the primary panel 20 is oriented horizontally and no longer obstructs the opening of the bumper 50 alone. The secondary panel 30 is this time oriented almost perpendicular to the said primary panel 20. It is still connected thereto by a pivot connection 34. The assembly of the secondary panel 30 and the primary panel 20 obstructs, at least partially an opening of the bumper 50. The deployment of the primary panel 20 created three openings, one central between the primary panel and the bumper 50, and two lateral sides (along the Y axis) of the primary panel 20. The secondary panel 30 is obstructing the central opening 50 when the diffuser 10 is in the deployed position. In this position, the internal space of the diffuser 70 is actually larger than when the diffuser 10 is in the retracted position. This internal space 70, is protected from dirt from the outside of the vehicle, because the opening of the bumper 50 is obstructed by the primary panel 20 and the secondary panel 30. Advantageously, the primary panel 20 may have a general shape "U" allowing it to obstruct the lateral openings between it and the bumper 50, when the diffuser is in the deployed position.
En position déployée, le diffuseur 10 est apte à diriger l'air depuis le soubassement du véhicule vers l'arrière de celui-ci, et ainsi décaler vers l'arrière les points de décollement de l'air par rapport au véhicule, c'est-à-dire les points au niveau desquels l'air ne suit plus la carrosserie. Cela permet de repousser vers l'arrière la dépression se créant à l'arrière du véhicule et ainsi limiter l'effet de retenue (appelé « effet de succion ») de cette dépression sur le véhicule automobile. De ce fait, le diffuseur 10 permet de diminuer la force de traînée lorsqu'il est déployé. In the deployed position, the diffuser 10 is able to direct the air from the underbody of the vehicle towards the rear of the latter, and thus to shift back the points of separation of the air with respect to the vehicle. that is to say the points at which the air no longer follows the bodywork. This helps push back the depression to creating the rear of the vehicle and thus limit the effect of restraint (called "suction effect") of this depression on the motor vehicle. As a result, the diffuser 10 makes it possible to reduce the drag force when it is deployed.
Nous allons maintenant décrire le déploiement et la rétractation du diffuseur 10 des figures 1 et 2.  We will now describe the deployment and retraction of the diffuser 10 of Figures 1 and 2.
Un moteur électrique (non représenté) entraîne en rotation l'axe de rotation du mécanisme motorisé 62. Cet axe de rotation 62 étant lié aux systèmes à biellette de déploiement du panneau primaire 22, et du panneau secondaire 32, il entraîne donc l'activation de bielles de ces systèmes. Ainsi, par déploiement du système à biellettes 22, le panneau primaire est mû de sa position rétractée à sa position déployée. Il effectue ainsi, de par l'agencement du système à biellettes 22, une trajectoire suivant un mouvement combiné de plusieurs rotations simultanées autour de différents axes de rotations. Dans un même temps, le système à biellette de déploiement du panneau secondaire 32 est lui aussi entraîné en rotation par l'axe moteur 62. Le système à biellette 32, qui est relié à un point de fixation 36 du panneau secondaire 30, entraîne donc celui-ci en rotation afin qu'il se place en position déployée. Dans un même temps, le panneau primaire 20, qui est lié au panneau secondaire 30 par une liaison pivot 34, entraîne celui-ci par le biais de cette liaison 34. Ainsi, le panneau secondaire 30 effectue un mouvement de rotation simple par rapport au panneau primaire 20, mais effectue dans de manière simultanée un mouvement composé de plusieurs rotations et translations par rapport au pare-chocs arrière 40 du véhicule. Ainsi, le panneau secondaire 30 se retrouve placé de manière à obstruer une ouverture centrale entre la partie supérieure du pare-chocs 42 et le panneau primaire 20 du diffuseur. De cette manière, l'espace interne 70 du diffuseur est abrité de toute salissure qui aurait pu s'y introduire autrement. Ainsi, de la salissure comme de la boue, de la neige, de la poussière ou autre ne vient pas obstruer l'espace interne du diffuseur 70, ce qui empêcherait la rétractation de celui-ci.  An electric motor (not shown) rotates the axis of rotation of the motorized mechanism 62. This axis of rotation 62 being linked to the deployment rod systems of the primary panel 22, and the secondary panel 32, it therefore causes the activation connecting rods of these systems. Thus, by deployment of the rod system 22, the primary panel is moved from its retracted position to its deployed position. It thus performs, by the arrangement of the rod system 22, a trajectory following a combined movement of several simultaneous rotations around different axes of rotation. At the same time, the deployment link system of the secondary panel 32 is also rotated by the motor shaft 62. The link system 32, which is connected to an attachment point 36 of the secondary panel 30, therefore causes this one in rotation so that it is placed in deployed position. At the same time, the primary panel 20, which is connected to the secondary panel 30 by a pivot connection 34, drives the latter through this connection 34. Thus, the secondary panel 30 performs a simple rotational movement relative to the primary panel 20, but performs in a simultaneous motion consisting of several rotations and translations relative to the rear bumper 40 of the vehicle. Thus, the secondary panel 30 is placed so as to obstruct a central opening between the upper part of the bumper 42 and the primary panel 20 of the diffuser. In this way, the internal space 70 of the diffuser is sheltered from any dirt that might have been introduced otherwise. Thus, dirt such as mud, snow, dust or other does not obstruct the internal space of the diffuser 70, which would prevent the retraction thereof.
Cette cinétique particulière du panneau secondaire 30 présente de nombreux avantages. Premièrement, le mécanisme de rétractation et de déploiement du diffuseur 10, à savoir l'axe moteur 62, et les systèmes à biellettes 22 et 32, sont protégés des salissures. Ainsi, le risque de blocage du dispositif est grandement réduit. De même, l'usure de ces éléments mécaniques est fortement réduite de par leur protection aux salissures. Deuxièmement, le fait que le panneau secondaire 30 n'effectue qu'une simple rotation par rapport au panneau primaire 20 permet d'éviter la pénétration de salissures qui viendraient empêcher le mouvement relatif d'un panneau par rapport à l'autre. Si la liaison entre les deux panneaux 20 et 30 avait été par exemple une glissière, celle-ci aurait été exposée à des risques de blocage par insertion de salissures empêchant le mouvement de glissement. Cette remarque peut être faite pour tout diffuseur 10 dans lequel le panneau secondaire 30 effectuerait un mouvement de translation par rapport au panneau primaire 20. Enfin, utiliser un panneau secondaire 30 rigide, qui peut être peint (notamment dans la même teinte que le reste du véhicule), permet de donner une esthétique au diffuseur 10 qui soit en accord avec le reste du véhicule. De plus, un tel panneau 30 rigide possède une bien meilleure résistance à la fatigue que si l'on utilisait, par exemple, un élément flexible. This particular kinetics of the secondary panel 30 has many advantages. Firstly, the mechanism of retracting and deploying the diffuser 10, namely the motor shaft 62, and the rod systems 22 and 32, are protected from soiling. Thus, the risk of blocking the device is greatly reduced. Similarly, the wear of these mechanical elements is greatly reduced by their protection against soiling. Secondly, the fact that the secondary panel 30 performs only a single rotation relative to the primary panel 20 avoids the penetration of dirt that would prevent the relative movement of one panel relative to the other. If the connection between the two panels 20 and 30 had been for example a slide, it would have been exposed to risks of blockage by insertion of dirt preventing sliding movement. This remark can be made for any diffuser 10 in which the secondary panel 30 would translate with respect to the primary panel 20. Finally, use a rigid secondary panel 30, which can be painted (especially in the same shade as the rest of the vehicle), gives an aesthetic to the diffuser 10 which is in agreement with the rest of the vehicle. In addition, such a rigid panel has a much better fatigue strength than if, for example, a flexible element were used.
La figure 3 présente un diffuseur suivant un autre mode de réalisation de l'invention en position déployée. Pour ce mode de réalisation, nous ne mentionnerons que les caractéristiques du diffuseur qui diffèrent de celui présenté en figures 1 et 2.  Figure 3 shows a diffuser according to another embodiment of the invention in the deployed position. For this embodiment, we will only mention the characteristics of the diffuser which differ from that shown in FIGS. 1 and 2.
Ici, le panneau secondaire 30 n'est pas directement lié avec le panneau primaire 20 comme précédemment. Cette liaison entre les deux panneaux est ici réalisée par l'intermédiaire d'au moins une biellette (non représentée). Le panneau secondaire effectue un mouvement avec un guidage par biellettes par rapport au panneau primaire lorsqu'il passe de la position rétractée à la position déployée ou inversement, de façon à ce que lesdites faces ne soient jamais en contact l'une de l'autre.  Here, the secondary panel 30 is not directly connected with the primary panel 20 as before. This connection between the two panels is here achieved by means of at least one rod (not shown). The secondary panel moves with a link guide relative to the primary panel as it moves from the retracted position to the deployed position or vice versa, so that said faces are never in contact with each other. .
De plus, le panneau secondaire 30 ne se rétracte pas dans le même sens. Ici, le panneau secondaire 30 est situé contre la partie supérieure du pare-chocs 42, au lieu d'être replié contre le panneau primaire 20 comme précédemment. Toutefois, le panneau secondaire 30 reste à l'intérieur du pare-chocs du véhicule. Lorsqu'il est déployé, le panneau secondaire est dans la même position que dans le mode de réalisation précédent.  In addition, the secondary panel 30 does not retract in the same direction. Here, the secondary panel 30 is located against the upper part of the bumper 42, instead of being folded against the primary panel 20 as before. However, the secondary panel 30 remains inside the bumper of the vehicle. When deployed, the secondary panel is in the same position as in the previous embodiment.
Lors de la rétractation du diffuseur, le panneau secondaire effectue donc une rotation afin de venir se placer de manière quasiment verticale et collée contre la partie supérieure du pare-chocs 42. De cette manière, l'interstice entre le panneau secondaire 30 et la partie supérieure du pare-chocs 42 est très faible toute au long de la rétractation (et de la même façon lors du déploiement). L'espace interne du diffuseur 70 est donc très bien protégé des salissures, même lors du déploiement et de la rétractation.  During the retraction of the diffuser, the secondary panel thus rotates to be placed almost vertically and glued against the upper part of the bumper 42. In this way, the gap between the secondary panel 30 and the part upper bumper 42 is very low throughout the retraction (and the same way during deployment). The internal space of the diffuser 70 is therefore very well protected from soiling, even during deployment and retraction.
II est tout à fait possible que les panneaux primaire et secondaire ne soient pas liés directement. Dans ce cas, c'est le système à biellettes de déploiement du panneau secondaire qui assure à lui seul le déploiement du panneau secondaire.  It is quite possible that the primary and secondary panels are not directly connected. In this case, it is the secondary panel deployment link system which alone ensures the deployment of the secondary panel.
La figure 4 présente un autre mode de réalisation de l'invention dans lequel le diffuseur 10 comporte non plus un seul, mais trois panneaux secondaires 30. Pour ce mode de réalisation, nous ne mentionnerons que les caractéristiques du diffuseur qui diffèrent de celui présenté en figures 1 et 2.  FIG. 4 shows another embodiment of the invention in which the diffuser 10 comprises not only one, but three secondary panels 30. For this embodiment, we will only mention the characteristics of the diffuser which differ from that presented in FIG. Figures 1 and 2.
La figure 4 est une vue en coupe suivant un plan horizontal du diffuseur 10 inséré dans un pare-chocs de véhicule 40. FIG. 4 is a sectional view along a horizontal plane of the inserted diffuser 10 in a vehicle bumper 40.
Le diffuseur arrière 10 est ici présenté en position déployée. On peut voir que, comme précédemment, le diffuseur 10 comporte un panneau primaire 20, ont le mouvement est entraîné par un système à biellette 22, lui-même entraîné par un axe moteur 62.  The rear diffuser 10 is here shown in the deployed position. It can be seen that, as previously, the diffuser 10 has a primary panel 20, the movement is driven by a rod system 22, itself driven by a motor axis 62.
À la différence du diffuseur présenté précédemment, celui-ci présente cette fois trois panneaux secondaires 30. Ces panneaux sont un panneau secondaire central 30a et deux panneaux secondaires latéraux 30b. Ces panneaux secondaires latéraux 30b sont situés de part et d'autre du panneau secondaire central 30a, par référence à l'axe transversal Y du véhicule. Ces trois panneaux 30 sont chacun lié à l'axe moteur 62 de déploiement du diffuseur 10 par un système à biellette 32. On peut voir que la présence de trois panneaux secondaires 30 permet au diffuseur d'épouser la forme concave du pare-chocs arrière de véhicule 40, les pare-chocs des véhicules étant ayant souvent des formes galbées, tout en ayant trois panneaux 32 présentant chacun une faible concavité. Ceci présente un avantage certain en termes de compacité du diffuseur une fois en position rétractée, car un seul panneau secondaire 30 présenterait une concavité qui lui ferait occuper un espace plus grand une fois rétracté, ce qui rendrait le système très encombrant pour le loger derrière le pare-chocs.  Unlike the diffuser presented above, this one presents this time three secondary panels 30. These panels are a central secondary panel 30a and two side secondary panels 30b. These side secondary panels 30b are located on either side of the central secondary panel 30a, with reference to the transverse axis Y of the vehicle. These three panels 30 are each connected to the motor spindle 62 of the diffuser 10 by a rod system 32. It can be seen that the presence of three secondary panels 30 allows the diffuser to match the concave shape of the rear bumper vehicle 40, the bumpers of vehicles being often curved shapes, while having three panels 32 each having a low concavity. This has a definite advantage in terms of the compactness of the diffuser once in the retracted position, because a single secondary panel 30 would have a concavity that would make it occupy a larger space once retracted, which would make the system very bulky to house it behind the bumper.
Le déploiement et la rétractation du diffuseur 10 se font de la même manière que celles du diffuseur du mode de réalisation précédent. La seule différence est que chaque panneau secondaire 30 possède son propre système à biellette de déploiement 32. Toutefois, chacun de ces système 32 est actionné par un même axe moteur 62. Ainsi, ce diffuseur présente les mêmes avantages que ceux développés pour le diffuseur du mode de réalisation précédent.  The deployment and retraction of the diffuser 10 are in the same manner as those of the diffuser of the previous embodiment. The only difference is that each secondary panel 30 has its own deployment link system 32. However, each of these systems 32 is actuated by the same motor axis 62. Thus, this diffuser has the same advantages as those developed for the diffuser of the previous embodiment.
La figure 5 présente un autre mode de réalisation de l'invention qui diffère du mode de réalisation présenté en figure 4 en ce que les panneaux secondaires ne sont pas tous liés chacun à un axe de rotation secondaire du mécanisme motorisé 64. Pour ce mode de réalisation, nous ne mentionnerons que les caractéristiques du diffuseur qui diffèrent de celui présenté en figure 4.  FIG. 5 shows another embodiment of the invention which differs from the embodiment shown in FIG. 4 in that the secondary panels are not all each connected to a secondary axis of rotation of the motorized mechanism 64. For this embodiment of FIG. realization, we will mention only the characteristics of the diffuser which differ from that presented in figure 4.
Dans ce mode de réalisation, le diffuseur arrière 10 comporte au moins trois panneaux secondaires 30. L'un de ces panneaux est le panneau secondaire central 30a, et les deux autres sont les panneaux secondaires latéraux 30b, qui sont situés de part et d'autre du panneau secondaire central 30a, par référence à l'axe transversal Y du véhicule. Comme précédemment, les panneaux secondaires présentent un agencement permettant d'épouser la forme concave du pare-chocs arrière 40. Ici, les panneaux secondaires latéraux 30b sont liés à des axes de rotations secondaires 64 du mécanisme motorisé. Il y a donc un axe de rotation secondaire du mécanisme motorisé 64 par panneau secondaire latéral 30b, en plus de l'axe de rotation du mécanisme motorisé 62. Ces axes de rotation secondaires 64 sont désaxés par rapport à l'axe de rotation du mécanisme motorisé 62. De cette manière, chaque axe de rotation secondaire 64 est parallèle à un plan principal du panneau secondaire latéral 30b auquel il est lié. Cette disposition permet de modifier l'axe de rotation du panneau secondaire latéral 30b, afin de faciliter le rangement de ce panneau 30b dans le pare- chocs arrière 40, lorsque le diffuseur 10 est en position rétractée. De cette façon, les panneaux secondaires latéraux épousent aussi mieux la concavité du pare-chocs arrière 40. Cette disposition est particulièrement avantageuse quand le pare-chocs arrière 40 présente une forte concavité. In this embodiment, the rear diffuser 10 has at least three secondary panels 30. One of these panels is the central secondary panel 30a, and the other two are the side secondary panels 30b, which are located on the side and side panels. other of the central secondary panel 30a, with reference to the transverse axis Y of the vehicle. As before, the secondary panels have an arrangement to match the concave shape of the rear bumper 40. Here, the side secondary panels 30b are connected to secondary rotational axes 64 of the motorized mechanism. There is therefore a secondary axis of rotation of the motorized mechanism 64 by lateral side panel 30b, in addition to the axis of rotation of the motorized mechanism 62. These secondary rotation axes 64 are off-axis with respect to the axis of rotation of the motorized mechanism 62. In this way, each secondary axis of rotation 64 is parallel to a main plane of the side secondary panel 30b to which it is connected. This arrangement makes it possible to modify the axis of rotation of the side secondary panel 30b, in order to facilitate storage of this panel 30b in the rear bumper 40, when the diffuser 10 is in the retracted position. In this way, the side side panels also better match the concavity of the rear bumper 40. This arrangement is particularly advantageous when the rear bumper 40 has a strong concavity.
La liaison entre les axes de rotation secondaire du mécanisme motorisé 64 et l'axe de rotation 62 est assurée par des joints de cardan 66 disposés entre ceux-ci. De cette manière, l'axe de rotation 62 peut entraîner les axes de rotations secondaires du mécanisme motorisé 64 de manière directe, même si ceux-ci sont désaxés. Cela permet d'entraîner ces axes secondaires 64 à l'aide d'un seul moteur entraînant l'axe de rotation 62. De manière alternative, le moteur peut entraîner uniquement un des axes de rotation secondaire du mécanisme motorisé 64, qui entraîne à son tour l'axe de rotation 62.  The connection between the secondary rotation axes of the motorized mechanism 64 and the axis of rotation 62 is provided by universal joints 66 disposed therebetween. In this way, the axis of rotation 62 can cause the secondary rotation axes of the motor mechanism 64 directly, even if they are off-axis. This makes it possible to drive these secondary axes 64 by means of a single motor driving the axis of rotation 62. Alternatively, the motor can drive only one of the secondary rotation axes of the powered mechanism 64, which causes its turn the axis of rotation 62.
Pour chacun des modes de réalisation présentés en figures 4 et 5, le déploiement des panneaux secondaires latéraux 30b peut de manière alternative être retardé par rapport au déploiement du panneau secondaire central 30a. Ainsi, de cette manière, lors du déploiement du diffuseur 10, le panneau secondaire central 30a se déploie en premier jusqu'à atteindre sa position déployée. Les panneaux secondaires latéraux 30b sont eux déployées avec un retard par rapport au panneau secondaire central 30a. Ainsi, une fois que le panneau secondaire central 30a est en position déployée, les panneaux secondaires latéraux 30b viennent se plaquer contre celui-ci. De la même manière, lors de la rétractation du diffuseur arrière 10, la rétractation des panneaux secondaires latéraux 30b a lieu en avance sur la rétractation du panneau secondaire central 30a.  For each of the embodiments shown in FIGS. 4 and 5, the deployment of the side side panels 30b may alternatively be delayed with respect to the deployment of the central subpanel 30a. Thus, in this way, during the deployment of the diffuser 10, the central secondary panel 30a deploys first until reaching its deployed position. The side secondary panels 30b are deployed with a delay relative to the central secondary panel 30a. Thus, once the central secondary panel 30a is in the deployed position, the side secondary panels 30b are pressed against it. In the same way, during the retraction of the rear diffuser 10, the retraction of the side secondary panels 30b takes place in advance of the retraction of the central secondary panel 30a.
Cette cinématique séquentielle de déploiement permet d'éviter une détérioration des panneaux secondaires central 30a et latéraux 30b par frottement de ces panneaux les uns contre les autres lors d'un déploiement simultané. Également, elle permet aux panneaux secondaires latéraux 30b de se plaquer au mieux contre le panneau secondaire central 30a. De cette façon, le mouvement de déploiement et de rétractation des panneaux secondaires latéraux 30b n'est pas entravé par le mouvement de déploiement et de rétractation du panneau secondaire central 30a. Ainsi, les interstices entre le panneau secondaire central 30a et les panneaux secondaires latéraux 30b d'une part, et entre les panneaux secondaires latéraux 30b et le pare-chocs arrière 40 d'autre part sont bouchés de manière efficace. This sequential deployment kinematics makes it possible to avoid deterioration of the central and lateral 30a and 30b secondary panels by friction of these panels against each other during a simultaneous deployment. Also, it allows the side side panels 30b to flatten against the central secondary panel 30a. In this way, the deployment and retraction movement of the side side panels 30b is not impeded by the deployment and retracting movement of the central subpanel 30a. Thus, the interstices between the central secondary panel 30a and the side secondary panels 30b on the one hand, and between the side secondary panels 30b and the rear bumper 40 on the other hand are clogged effectively.
L'invention n'est pas limitée aux modes de réalisation présentés et d'autres modes de réalisation apparaîtront clairement à l'homme du métier.  The invention is not limited to the embodiments presented and other embodiments will become apparent to those skilled in the art.
Notamment, il est possible de guider le déploiement des panneaux primaire et secondaire à l'aide d'un autre mécanisme que celui utilisant des systèmes à biellette. On peut par exemple utiliser à cet effet un système à came ou à engrenages, ou tout autre système que l'on jugera utile d'utiliser ici.  In particular, it is possible to guide the deployment of the primary and secondary panels using a mechanism other than that using rod systems. One can for example use for this purpose a cam or gear system, or any other system that it will be useful to use here.
En variation, le diffuseur arrière peut, au lieu d'être inséré dans une ouverture du pare-chocs arrière du véhicule, être inséré entre un pare-chocs arrière et un bas de caisse du véhicule.  In variation, the rear diffuser can, instead of being inserted into an aperture of the rear bumper of the vehicle, be inserted between a rear bumper and a sill of the vehicle.
Il est aussi possible d'avoir un panneau secondaire effectuant un mouvement de translation simple par rapport à l'élément de carrosserie lorsqu'il passe de la position rétractée à la position déployée, et inversement. It is also possible to have a secondary panel performing a simple translational movement relative to the body member when it moves from the retracted position to the deployed position, and vice versa.
Nomenclature Nomenclature
10 : diffuseur arrière 10: rear diffuser
20 : panneau primaire 20: primary panel
22 : système à biellette de déploiement du panneau primaire 30 : panneau secondaire 22: primary panel deployment link system 30: secondary panel
30a : panneau secondaire central 30a: central secondary panel
30b : panneau secondaire latéral 30b: side secondary panel
32 : système à biellette de déploiement du panneau secondaire 34 : liaison pivot  32: secondary panel deployment link system 34: pivot link
36 : point de fixation  36: fixing point
40 : pare-chocs arrière  40: rear bumper
42 : partie supérieure du pare-chocs  42: upper part of the bumper
44 : partie inférieure du pare-chocs  44: lower part of the bumper
50 : ouverture du pare-chocs 50: opening the bumper
60 : système d'actionnement  60: actuation system
62 : axe de rotation du mécanisme motorisé  62: axis of rotation of the motorized mechanism
64 : axe de rotation secondaire du mécanisme motorisé 64: secondary rotation axis of the motorized mechanism
66 : joint de cardan 66: universal joint
70 : espace interne du diffuseur 70: internal space of the diffuser

Claims

Revendications claims
1 . Diffuseur arrière (10) de véhicule automobile comprenant un panneau primaire (20) et au moins un panneau secondaire (30), chacun de ces panneaux (20, 30) étant mobile entre une position déployée et une position rétractée lorsque le diffuseur arrière (10) est fixé sur une pièce de carrosserie de véhicule, caractérisé en ce que, lorsque la pièce de carrosserie est fixée sur un véhicule automobile, le panneau secondaire (30) est complètement non visible de l'extérieur en position rétractée et obstrue l'ouverture (50) entre la pièce de carrosserie et le panneau primaire (20) en position déployée. 1. A motor vehicle rear diffuser (10) comprising a primary panel (20) and at least one secondary panel (30), each panel (20, 30) being movable between an extended position and a retracted position when the rear diffuser (10) ) is attached to a vehicle bodywork part, characterized in that, when the bodywork part is attached to a motor vehicle, the secondary panel (30) is completely invisible from the outside in the retracted position and obstructs the opening (50) between the body part and the primary panel (20) in the deployed position.
2. Diffuseur arrière (10) selon la revendication précédente dans lequel le panneau primaire (20) est dépourvu d'une liaison mécanique directe avec le panneau secondaire (30).  2. rear diffuser (10) according to the preceding claim wherein the primary panel (20) is free of a direct mechanical connection with the secondary panel (30).
3. Diffuseur arrière (10) selon l'une des revendications précédentes dans lequel le panneau secondaire (30) est lié au panneau primaire (20) à l'aide d'au moins une biellette, les panneaux (20, 30) n'étant jamais en contact l'un avec l'autre.  3. rear diffuser (10) according to one of the preceding claims wherein the secondary panel (30) is connected to the primary panel (20) with at least one rod, the panels (20, 30) n ' never being in contact with each other.
4. Diffuseur (10) selon l'une des revendications précédentes dans lequel le panneau secondaire (30) effectue un mouvement de rotation simple par rapport au panneau primaire (20) lorsqu'il passe de la position rétractée à la position déployée ou inversement.  4. Diffuser (10) according to one of the preceding claims wherein the secondary panel (30) performs a simple rotational movement relative to the primary panel (20) when moving from the retracted position to the deployed position or vice versa.
5. Diffuseur arrière (10) selon l'une des revendications 1 ou 4 dans lequel le panneau secondaire (30) est lié au panneau primaire (20) par une liaison pivot (34).  5. Rear diffuser (10) according to one of claims 1 or 4 wherein the secondary panel (30) is connected to the primary panel (20) by a pivot connection (34).
6. Diffuseur arrière (10) selon la revendication 5 dans lequel le déploiement et la rétractation du panneau secondaire (30) sont actionnés par le mouvement du panneau primaire (20) via une transmission d'efforts par la liaison pivot (34).  A rear diffuser (10) according to claim 5 wherein the deployment and retraction of the secondary panel (30) is actuated by the movement of the primary panel (20) via force transmission by the pivot link (34).
7. Diffuseur arrière (10) selon l'une des revendications précédentes qui comprend un mécanisme motorisé apte à permettre un déploiement et une rétractation du panneau primaire (20) selon une trajectoire suivant un mouvement combiné de plusieurs rotations simultanées autour de différents axes de rotation.  7. rear diffuser (10) according to one of the preceding claims which comprises a motorized mechanism adapted to allow a deployment and retraction of the primary panel (20) along a path according to a combined movement of several simultaneous rotations around different axes of rotation .
8. Diffuseur arrière (10) selon l'une des revendications 1 à 4 et 7 dans lequel un mécanisme motorisé est apte à permettre un déploiement et une rétractation du panneau secondaire (30).  8. rear diffuser (10) according to one of claims 1 to 4 and 7 wherein a motorized mechanism is adapted to allow deployment and retraction of the secondary panel (30).
9. Diffuseur arrière (10) selon l'une des revendications précédentes dans lequel le panneau secondaire (30) se déploie et se rétracte selon une trajectoire suivant un mouvement combiné de plusieurs rotations simultanées autour de différents axes de rotation.  9. rear diffuser (10) according to one of the preceding claims wherein the secondary panel (30) deploys and retracts in a path following a combined movement of several simultaneous rotations around different axes of rotation.
10. Diffuseur arrière (10) selon l'une des revendications 1 à 8 dans lequel le panneau secondaire (30) se déploie et se rétracte selon une trajectoire suivant un mouvement de rotation simple par rapport à la pièce de carrosserie. 10. rear diffuser (10) according to one of claims 1 to 8 wherein the secondary panel (30) unfolds and retracts in a path following a simple rotation movement with respect to the bodywork part.
11 . Diffuseur arrière (10) selon l'une des revendications 1 à 8 dans lequel le panneau secondaire (30) se déploie et se rétracte selon une trajectoire suivant un mouvement de translation par rapport à la pièce de carrosserie.  11. Rear diffuser (10) according to one of claims 1 to 8 wherein the secondary panel (30) unfolds and retracts along a path in a translation movement relative to the body part.
12. Diffuseur arrière (10) selon les revendications 7 et 8 dans lequel le déploiement et la rétractation des panneaux primaire (20) et secondaire (30) sont assurés par le même mécanisme.  12. Rear diffuser (10) according to claims 7 and 8 wherein the deployment and retraction of the primary panels (20) and secondary (30) are provided by the same mechanism.
13. Diffuseur arrière (10) selon la revendication 12, dans lequel le mécanisme motorisé comporte un axe de rotation (62) apte à entraîner le déploiement et la rétractation des panneaux primaire (20) et secondaire (30).  13. A rear diffuser (10) according to claim 12, wherein the motorized mechanism comprises an axis of rotation (62) adapted to cause the deployment and retraction of the primary panels (20) and secondary (30).
14. Diffuseur arrière (10) selon les revendications précédentes comportant plusieurs panneaux primaires (20), par exemple trois.  14. Rear diffuser (10) according to the preceding claims comprising a plurality of primary panels (20), for example three.
15. Diffuseur arrière (10) selon les revendications précédentes comportant plusieurs panneaux secondaires (30), par exemple trois, composés d'un panneau secondaire central (30a) et d'au moins un panneau secondaire latéral (30b).  15. Rear diffuser (10) according to the preceding claims comprising a plurality of secondary panels (30), for example three, composed of a central secondary panel (30a) and at least one side secondary panel (30b).
16. Diffuseur arrière (10) selon les revendications 13 et 15 dans lequel l'axe de rotation (62) entraîne au moins un axe de rotation secondaire (64) du mécanisme motorisé par l'intermédiaire d'un joint de cardan (66), l'axe de rotation secondaire (64) entraînant le déploiement et la rétractation du panneau secondaire latéral (30b) et étant désaxé par rapport à l'axe de rotation (62).  16. A rear diffuser (10) according to claims 13 and 15 wherein the axis of rotation (62) drives at least one secondary axis of rotation (64) of the motorized mechanism via a universal joint (66). , the secondary axis of rotation (64) causing the deployment and retraction of the lateral secondary panel (30b) and being off-axis with respect to the axis of rotation (62).
17. Pièce de carrosserie de véhicule automobile comprenant un diffuseur arrière (10) selon l'une quelconque des revendications précédentes.  Motor vehicle body part comprising a rear diffuser (10) according to any one of the preceding claims.
18. Pièce de carrosserie selon la revendication précédente, la pièce de carrosserie étant un pare-chocs arrière (40).  18. Bodywork part according to the preceding claim, the bodywork part being a rear bumper (40).
19. Pièce de carrosserie selon l'une des revendications 17 et 18, dans laquelle le panneau secondaire (30) est apte éviter l'intrusion de corps étrangers entre la pièce de carrosserie et le panneau primaire (20).  19. Bodywork part according to one of claims 17 and 18, wherein the secondary panel (30) is able to avoid the intrusion of foreign bodies between the bodywork part and the primary panel (20).
20. Pièce de carrosserie selon l'une des revendications 17 à 19, dans laquelle le panneau primaire (20) comporte une face tournée vers l'extérieur du véhicule en position déployée et en position rétractée, le panneau secondaire (30) comporte une face tournée vers l'extérieur du véhicule en position déployée et tournée vers l'intérieur du véhicule en position rétractée.  20. Body part according to one of claims 17 to 19, wherein the primary panel (20) has an outwardly facing face of the vehicle in the extended position and in the retracted position, the secondary panel (30) has a face turned towards the outside of the vehicle in the extended position and turned towards the interior of the vehicle in the retracted position.
21 . Pièce de carrosserie selon la revendication précédente dans laquelle le panneau secondaire (30) est non-visible depuis l'extérieur du véhicule lorsque le diffuseur (10) est en position rétractée.  21. Body part according to the preceding claim wherein the secondary panel (30) is non-visible from outside the vehicle when the diffuser (10) is in the retracted position.
22. Pièce de carrosserie selon la revendication précédente, dans laquelle le panneau secondaire (30) effectue un mouvement de rotation simple par rapport au panneau primaire (20) lorsqu'il passe de la position rétractée à la position déployée ou inversement, de façon à ce que lesdites faces ne soient jamais en contact l'une de l'autre. 22. Bodywork part according to the preceding claim, wherein the secondary panel (30) performs a simple rotational movement relative to the primary panel (20) when it moves from the retracted position to the deployed position or vice versa, so that said faces are never in contact with each other.
EP18789413.4A 2017-10-19 2018-10-19 Motor vehicle moveable rear diffuser with multiple panels Withdrawn EP3697675A1 (en)

Applications Claiming Priority (2)

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FR1759830A FR3072640B1 (en) 2017-10-19 2017-10-19 MOBILE REAR DIFFUSER OF A MULTI-PANEL AUTOMOTIVE VEHICLE
PCT/EP2018/078691 WO2019077101A1 (en) 2017-10-19 2018-10-19 Motor vehicle moveable rear diffuser with multiple panels

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EP3792163B1 (en) * 2019-09-10 2024-03-06 Yanfeng Plastic Omnium Automotive Exterior Systems Co., Ltd. Revolvable active diffuser for vehicle
DE102021111749B3 (en) 2021-05-06 2022-04-14 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Motor vehicle body with an air guiding device and with a trailer hitch mounting device and a method for a motor vehicle body
DE102021111761A1 (en) 2021-05-06 2022-11-10 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Rear assembly for a vehicle
DE102021111756A1 (en) 2021-05-06 2022-11-10 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Rear assembly for a vehicle
DE102021111754B3 (en) 2021-05-06 2022-04-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Motor vehicle body with an air guiding device and with a trailer hitch mounting device and a method for a motor vehicle body
DE102021003212A1 (en) 2021-06-22 2021-08-05 Daimler Ag Rear diffuser assembly for a vehicle
US11891126B2 (en) 2021-08-24 2024-02-06 Honda Motor Co., Ltd. Active rear diffuser for vehicle

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FR2963309B1 (en) * 2010-07-27 2012-08-10 Peugeot Citroen Automobiles Sa AERODYNAMIC SCREEN FIXED UNDER THE REVERSE PART OF THE BASE OF A MOTOR VEHICLE AND VEHICLE THUS EQUIPPED.
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