EP3678924A1 - Movable geared rear diffuser - Google Patents

Movable geared rear diffuser

Info

Publication number
EP3678924A1
EP3678924A1 EP18765444.7A EP18765444A EP3678924A1 EP 3678924 A1 EP3678924 A1 EP 3678924A1 EP 18765444 A EP18765444 A EP 18765444A EP 3678924 A1 EP3678924 A1 EP 3678924A1
Authority
EP
European Patent Office
Prior art keywords
gear
movable panel
diffuser
rear diffuser
vehicle
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Withdrawn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
EP18765444.7A
Other languages
German (de)
French (fr)
Inventor
Romain CRETIER
Frédéric STABLO
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 EP3678924A1 publication Critical patent/EP3678924A1/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Withdrawn legal-status Critical Current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
    • B62D37/00—Stabilising vehicle bodies without controlling suspension arrangements
    • B62D37/02—Stabilising vehicle bodies without controlling suspension arrangements by aerodynamic means
    • 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

Definitions

  • the invention relates to the rear diffusers of a motor vehicle 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 aforementioned force also generates turbulence at the mobile panel when it is deployed, which creates difficulties in keeping it in position.
  • This turbulence intensifying at high speed it then becomes necessary to retract the movable panel at high speed using an actuator having a large output torque.
  • the invention aims to provide a rear diffuser of a motor vehicle to effectively reduce the aerodynamic drag of the motor vehicle while ensuring easy deployment and maintenance in position of the movable panel.
  • the invention relates to a rear diffuser of a motor vehicle comprising at least one movable panel between an extended position and a retracted position when the rear diffuser is fixed on a rear bumper of a motor vehicle, the rear diffuser comprising a motorized mechanism comprising at least one gear adapted to allow a portion of the movable panel in the deployed position to be pressed under the rear bumper when the rear diffuser is fixed to a rear bumper of a motor vehicle.
  • the movable panel in the deployed position does not allow air to pass over it.
  • This positioning makes it possible to direct the air from the underbody of the vehicle towards the lower part of the diffuser.
  • the absence of an air passage on the upper part of the diffuser makes it possible to avoid the use of a vertical force (from top to bottom) on the deployed mobile panel, which makes it easier to retract or hold the mobile panel in position.
  • This orientation of the air from the base of the vehicle to the lower part of the diffuser also limits the turbulence due to possible play ("aerodynamic"), or during transitions of the diffuser position (continuity of surfaces at the scale aerodynamic).
  • the gear allows a secure position of the movable panel in the extended or retracted position thanks to the locking points created by the interaction between the teeth of the parts constituting this gear. We can then provide an actuator less powerful and bulky than those according to the prior art.
  • the motorized mechanism is adapted to allow deployment and retraction of the movable panel along a path according to a combined movement of translation and rotation;
  • the gear comprises at least two meshing gears;
  • the two toothed wheels are connected to one another by two connecting rods pivotally mounted with respect to the toothed wheels;
  • a first gear is rotatable about its main axis, a second gear being movable along the first gear;
  • the second toothed wheel comprises an arm fixed on the movable panel
  • the motorized mechanism comprises a wheel and a cam adapted to allow the variation of the position of the wheel
  • the motorized mechanism further comprises a belt adapted to allow the deployment of the toothed wheel along the cam;
  • the motorized mechanism comprises a plurality of gears and a device adapted to allow selection of a gear among said plurality of gears.
  • the invention also relates to a rear bumper comprising a rear diffuser according to the invention.
  • FIG. 1 shows a vehicle whose rear bumper comprises a rear diffuser according to the invention, the rear diffuser being in the retracted position;
  • FIG. 2 shows a vehicle whose rear bumper comprises a rear diffuser according to the invention, the rear diffuser being in the deployed position;
  • FIG. 3 is an enlargement of a motorized mechanism for deploying and retracting the movable panel of the rear diffuser of FIGS. 1 and 2 according to a first embodiment of the invention, the motorized mechanism being in a configuration corresponding to the movable panel in retracted position;
  • FIG. 4 is an enlargement of a motorized mechanism for deployment and retraction of the movable panel of the rear diffuser of FIGS. 1 and 2 according to the first embodiment of the invention, the motorized mechanism being in a configuration corresponding to the mobile panel during deployment or retraction;
  • FIG. 5 is an enlargement of a motorized mechanism for deployment and retraction of the movable panel of the rear diffuser of FIGS. 1 and 2 according to the first embodiment of the invention, the motorized mechanism being in a configuration corresponding to the mobile panel. in the deployed position;
  • FIG. 6 is a side view of a motorized mechanism for deployment and retraction of the movable panel of Figures 1 and 2 according to a second embodiment of the invention.
  • the figures show a rear diffuser in its configuration mounted on a automotive vehicle body part, more precisely a rear bumper of a motor vehicle.
  • FIGS 1 and 2 illustrate a rear diffuser 2 of a motor vehicle, for example made of plastic, mounted on a rear bumper 4, for example also made of plastic, and comprising at least one movable panel 6 between a position deployed and a retracted position when the rear diffuser 2 is fixed on the rear bumper 4 of a motor vehicle, the rear diffuser 2 comprising a motorized mechanism adapted to allow a portion of the movable panel 6 in the deployed position to press against the piece of the bodywork 4, here the rear bumper 4, when the rear diffuser 2 is fixed on the rear bumper 4.
  • the rear diffuser 2 may also comprise a fixed part, for example a frame fixed to the rear bumper 4, not shown in the figures.
  • the rear diffuser 2 is therefore able to pass from a retracted position shown in FIG. 1, in which the movable panel 6 can be pressed against the rear bumper 4, in an extended position, in which a lower end 8 of the movable panel 6 is pressed under the rear bumper 4, more precisely under the lower line of the vehicle corresponding to the line of separation of the air flow of the rear bumper 4.
  • This configuration in the deployed position can prevent the air to pass above the movable panel which avoids the formation of support in a direction parallel to a vertical axis Z while allowing to reduce the aerodynamic drag by pushing back the points of separation of the flow of 'air.
  • the movable panel 6 is therefore able, thanks to a trajectory following a combined movement of translation and rotation, to move away in a first step from the rear bumper 4 (the high end 9 of the movable panel 6 moves away strongly rear bumper) and then pass under the skirt of the motor vehicle so that the end 8 of the movable panel 6 is pressed under the rear bumper 4.
  • the trajectory of the movable panel 6 allows it to move away from the vehicle before to press against the latter which avoids damaging the movable panel 6 because of possible friction.
  • the rear diffuser 2 may comprise one or more motorized mechanisms capable of to deploy and retract the movable panel 6.
  • the motorized mechanism comprises at least one gear 10 shown in Figures 3 to 5. It may be a single gear located in the center of the diffuser in a direction parallel to the transverse axis Y of the vehicle or two eccentric gears.
  • This gear 10 may be composed of two gear wheels 12 and 14 geared.
  • the two gears 12 and 14 are connected to each other by rods 16 and 18 pivotally mounted at their points of attachment to the gears 12 and 14. This allows them to move relative to each other. to the other.
  • the first gearwheel 12 (the larger of the two wheels) can be set in motion by an actuator (not shown) which can for example be a rotational motor that can be deported or not.
  • This actuator can rotate the first gearwheel 12 around its main axis A.
  • This rotation enables the second gearwheel 14 to move around the first toothed wheel 12 by interaction between the teeth of the two toothed wheels 12 and 14, as this is visible in Figures 3 to 5 on which we see this displacement.
  • the second toothed wheel 14 (the smaller of the two wheels) comprises, in addition to its ability to move around the first toothed wheel 12, an arm 20, here rectilinear, secured at one of these ends to the second toothed wheel 14 and at its other end to the movable panel 6 (connection not shown in Figures 3 to 5).
  • This connection makes it possible to transmit the movement of the second toothed wheel 14 to the movable panel 6 in order to allow the latter to move according to the movements indicated above.
  • a suitable dimensioning of the gears 12 and 14, the size of the teeth of the gears 12 and 14 or the size of the arm 20 as well as its positioning between the toothed wheel 14 and the movable panel 6 allows ensure adequate movement of the movable panel 6.
  • gear according to the invention Another advantage of a gear according to the invention is that the first gear 12 can be standardized and the second gear 14 and the arm 20 are then customized according to the vehicle comprising the movable panel 6 and the movement of the movable panel 6 wanted for this vehicle.
  • the use of a gear makes it possible to have a compact deployment / retraction mechanism requiring few components.
  • the compactness also makes it easy to isolate the mechanism of the chippings or projections of mud and / or rain because it is not a "ventilated" mechanism, that is to say not including large spaces between them. elements composing it.
  • the gear When deploying the mobile panel 6 (for example when the vehicle reaches a certain speed), the gear is first in the configuration shown in Figure 3.
  • the actuator moves the first gear 12 which rotates around its main axis A. This has the effect of moving the second gear 14 around the first gear 12 and, with the arm 20, to move the movable panel 6 from its retracted position to its extended position (of Figure 3). in Figure 5 through Figure 4).
  • the passage of the movable panel 6 from its extended position to its retracted position is performed in the same manner with an actuator allowing the first gear 12 to rotate in the opposite direction relative to its rotation during the deployment of the movable panel 6.
  • the gear comprises a cam 22 in addition to a wheel 24 and a belt 26.
  • This wheel 24 is formed of two coaxial wheels, a toothed wheel 24a and a wheel notched 24b, the toothed wheel 24a is in contact with the cam 22 which is toothed while the toothed wheel 24b is in contact with the belt 26.
  • These two wheels 24a and 24b are not integral and freely rotate relative to each other. the other, while remaining coaxial.
  • the fixing point 28 is formed of two coaxial wheels, with on the one hand a wheel (not shown) on which is fixed the cam 22 and on the other hand a wheel 28a which is notched and which is in contact with the belt 26 (the belt may be notched or smooth).
  • the cam 22 is toothed and pivotally mounted around its attachment point 28 on the vehicle. This movement, symbolized by the arrow 30, makes it possible to adjust the position of the gearing (position modified according to the needs of the vehicle, the type of road, the type of driving or the load carried away from the vehicle (which can vary the ground clearance of the vehicle)) and can be provided by an actuator connected to the cam 22.
  • the toothed wheel 24a is meshing with the cam 22 and is able to move along the cam 22.
  • the belt 26 is elastically deformable to to allow the wheels 24a and 24b to move along the cam while maintaining contact between the toothed wheel 24a and the cam 22.
  • the belt 26 is rotatable by means of an actuator which may be present at the point of attachment 28 of the cam 22 to the vehicle and it drives the toothed wheel 24b.
  • the toothed wheel 24b can be connected to the movable panel 6 in the same way as the toothed wheel 14, that is to say by means of an arm secured to one of these ends of the toothed wheel 24b and to its other end of solidarity of the mobile panel 6.
  • the actuator allowing the movement of the cam 22 can move the cam 22 to adjust if necessary the position of the deployment / retraction mechanism, that is to say that the axis of the gear changes position, the coaxial wheels 24a and 24b remain in the same planes.
  • the belt 26 is set in motion by the wheel 28a which is rotated on the axis to move the belt 26, which causes the rotation of the toothed wheel 24b to deploy and retract the rear diffuser. Note in passing that the movements of the cam 22 and the belt 26 are dissociated in the example described.
  • the setting in motion of the cam 22 as well as its capacity to deform elastically allow a displacement of the toothed wheel 24a along the cam 22 only to adapt the position of the axis of the coaxial wheels 24a and 24b.
  • the connection of the toothed wheel 24b to the movable panel allows a displacement of the latter simultaneous with that of the toothed wheel 24b.
  • the retraction is performed in the same way with a rotation in opposite direction of the belt 26.
  • the gear or gears are composed of a gearwheel identical to the first gearwheel 12 and several other gears to obtain different deployment kinetics of the movable panel.
  • the toothed wheel identical to the first gear 12 can then move one of the other gear wheels to allow a specific deployment of the movable panel, for example depending on the needs of the vehicle, the type of road, the type of driving or the load carried away from the vehicle (which can vary the ground clearance of the vehicle).
  • A main axis of the first gear wheel

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The invention relates to a rear diffuser (2) of a motor vehicle, comprising at least one panel (6) that can be moved between a deployed position and a retracted position when said rear diffuser (2) is mounted on a rear bumper (4) of the motor vehicle, the rear diffuser (2) having a motorised mechanism with at least one gearing (10) designed to allow one portion of the movable panel (6), in the deployed position, to be pressed under the rear bumper (4) when the rear diffuser (2) is mounted on a rear bumper (4) of the motor vehicle.

Description

Diffuseur arrière mobile à engrenage  Mobile rear diffuser with gear
L'invention concerne les diffuseurs arrière de véhicule automobile et plus particulièrement les diffuseurs arrière mobiles. The invention relates to the rear diffusers of a motor vehicle 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, comme par exemple celle décrite dans le document US 2017/113741 , 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, such as that described in US 2017/113741, consist of a rear diffuser comprising a movable panel rotated between a retracted position and an extended position when the vehicle is moving. 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.
Cependant, et afin de réduire de manière optimale la traînée du véhicule, il peut s'avérer nécessaire d'effectuer un mouvement de rotation important afin de décaler suffisamment vers l'arrière la dépression créée à l'arrière du véhicule. Ce mouvement de rotation important a pour conséquence d'éloigner fortement le panneau mobile du reste du véhicule automobile car le panneau mobile est galbé. De ce fait, la distance entre le centre du panneau mobile et le véhicule est importante. De plus, une rotation selon un angle important (mais nécessaire pour obtenir l'effet attendu) peut conduire à faire passer le panneau mobile sous la garde au sol minimale du véhicule, c'est-à-dire la distance entre le sol et le point le plus bas du châssis qui ne doit pas entrer en contact avec le sol. Ce passage sous la garde au sol conduit à un passage du flux d'air au-dessus du panneau mobile. Ce passage du flux d'air au-dessus du panneau mobile, entre le panneau mobile et la pièce de carrosserie, conduit à augmenter l'appui au sol du véhicule. Or, cette augmentation de l'appui au sol n'est pas une caractéristique recherchée dans ce cas de figure. Pire, l'appui au sol se caractérisant par l'exercice d'une force du haut vers le bas sur le panneau mobile, il est alors difficile de rétracter le panneau mobile voire même de le maintenir en position de manière stable. Il est par conséquent nécessaire de prévoir un dimensionnement important du couple de sortie de l'actionneur permettant les mouvements du panneau mobile. However, and in order to optimally reduce the drag of the vehicle, it may be necessary to perform a significant rotational movement to sufficiently shift back the depression created at the rear of the vehicle. This significant rotational movement has the effect of strongly moving the movable panel from the rest of the motor vehicle because the movable panel is curved. As a result, the distance between the center of the mobile panel and the vehicle is important. In addition, a rotation at a large angle (but necessary to achieve the expected effect) can lead to moving the movable panel under the minimal ground clearance of the vehicle, that is to say the distance between the ground and the ground. lowest point of the chassis that should not come into contact with the ground. This passage under the ground clearance leads to a passage of the air flow above the movable panel. This passage of the airflow above the movable panel, between the movable panel and the bodywork part, leads to increase the support of the vehicle ground. However, this increase of the ground support is not a characteristic sought in this case. Worse, the ground support is characterized by the exercise of a force from the top down on the movable panel, it is difficult to retract the mobile panel or even to maintain it in a stable position. It is therefore necessary to provide a large dimensioning of the output torque of the actuator allowing the movements of the movable panel.
La force mentionnée ci-dessus génère également des turbulences au niveau du panneau mobile lorsqu'il est déployé, ce qui génère des difficultés pour le maintenir en position. Ces turbulences s'intensifiant à haute vitesse, il devient alors indispensable de rétracter le panneau mobile à haute vitesse en utilisant un actionneur possédant un couple de sortie important.  The aforementioned force also generates turbulence at the mobile panel when it is deployed, which creates difficulties in keeping it in position. This turbulence intensifying at high speed, it then becomes necessary to retract the movable panel at high speed using an actuator having a large output torque.
L'invention a pour but de fournir un diffuseur arrière de véhicule automobile permettant de réduire efficacement la traînée aérodynamique du véhicule automobile tout en garantissant un déploiement et un maintien en position aisés du panneau mobile.  The invention aims to provide a rear diffuser of a motor vehicle to effectively reduce the aerodynamic drag of the motor vehicle while ensuring easy deployment and maintenance in position of the movable panel.
L'invention a pour objet un diffuseur arrière de véhicule automobile comprenant au moins un panneau mobile entre une position déployée et une position rétractée lorsque le diffuseur arrière est fixé sur un pare-chocs arrière de véhicule automobile, le diffuseur arrière comprenant un mécanisme motorisé comprenant au moins un engrenage apte à permettre à une partie du panneau mobile en position déployée de se plaquer sous le pare-chocs arrière lorsque le diffuseur arrière est fixé sur un pare-chocs arrière de véhicule automobile.  The invention relates to a rear diffuser of a motor vehicle comprising at least one movable panel between an extended position and a retracted position when the rear diffuser is fixed on a rear bumper of a motor vehicle, the rear diffuser comprising a motorized mechanism comprising at least one gear adapted to allow a portion of the movable panel in the deployed position to be pressed under the rear bumper when the rear diffuser is fixed to a rear bumper of a motor vehicle.
Ainsi, le panneau mobile en position déployé ne permet pas à l'air de passer au- dessus de lui. Ce positionnement permet de diriger l'air depuis le soubassement du véhicule vers la partie inférieure du diffuseur. L'absence de passage d'air sur la partie supérieure du diffuseur permet d'éviter l'exercice d'une force verticale (du haut vers le bas) sur le panneau mobile déployé, ce qui permet de façon plus aisée de rétracter ou de maintenir en position le panneau mobile.  Thus, the movable panel in the deployed position does not allow air to pass over it. This positioning makes it possible to direct the air from the underbody of the vehicle towards the lower part of the diffuser. The absence of an air passage on the upper part of the diffuser makes it possible to avoid the use of a vertical force (from top to bottom) on the deployed mobile panel, which makes it easier to retract or hold the mobile panel in position.
Cette orientation de l'air depuis le soubassement du véhicule vers la partie inférieure du diffuseur limite également les turbulences dues à d'éventuels jeux (« marche aérodynamique »), ou lors des transitions de position du diffuseur (continuité des surfaces à l'échelle aérodynamique). De plus, l'engrenage permet un maintien en position sûr du panneau mobile en position déployée ou rétractée grâce aux points de blocage créés par l'interaction entre les dents des pièces constituant cet engrenage. On peut alors prévoir un actionneur moins puissant et volumineux que ceux selon l'art antérieur.  This orientation of the air from the base of the vehicle to the lower part of the diffuser also limits the turbulence due to possible play ("aerodynamic"), or during transitions of the diffuser position (continuity of surfaces at the scale aerodynamic). In addition, the gear allows a secure position of the movable panel in the extended or retracted position thanks to the locking points created by the interaction between the teeth of the parts constituting this gear. We can then provide an actuator less powerful and bulky than those according to the prior art.
Le diffuseur arrière selon l'invention peut également comprendre une ou plusieurs des caractéristiques suivantes :  The rear diffuser according to the invention may also comprise one or more of the following characteristics:
- le mécanisme motorisé est apte à permettre un déploiement et une rétraction du panneau mobile selon une trajectoire suivant un mouvement combiné de translation et de rotation ; - l'engrenage comprend au moins deux roues dentées engrenées ; - The motorized mechanism is adapted to allow deployment and retraction of the movable panel along a path according to a combined movement of translation and rotation; the gear comprises at least two meshing gears;
- les deux roues dentées sont reliées l'une à l'autre par deux bielles montées pivotantes par rapport aux roues dentées ;  the two toothed wheels are connected to one another by two connecting rods pivotally mounted with respect to the toothed wheels;
- une première roue dentée est apte à tourner autour de son axe principal, une seconde roue dentée étant apte à se déplacer le long de la première roue dentée ; - A first gear is rotatable about its main axis, a second gear being movable along the first gear;
- la seconde roue dentée comprend un bras fixé sur le panneau mobile ; the second toothed wheel comprises an arm fixed on the movable panel;
- le mécanisme motorisé comprend une roue et une came apte à permettre la variation de la position de la roue ;  the motorized mechanism comprises a wheel and a cam adapted to allow the variation of the position of the wheel;
- le mécanisme motorisé comprend en outre une courroie apte à permettre le déploiement de la roue dentée le long de la came ; et  - The motorized mechanism further comprises a belt adapted to allow the deployment of the toothed wheel along the cam; and
- le mécanisme motorisé comprend plusieurs engrenages et un dispositif apte à permettre de sélectionner un engrenage parmi lesdits plusieurs engrenages. - The motorized mechanism comprises a plurality of gears and a device adapted to allow selection of a gear among said plurality of gears.
L'invention concerne également un pare-chocs arrière comprenant un diffuseur arrière selon l'invention. The invention also relates to a rear bumper comprising a rear diffuser according to the invention.
Nous allons maintenant présenter des modes de réalisation de l'invention donnés à titre d'exemple non limitatifs et à l'appui des figures annexées sur lesquelles :  We will now present embodiments of the invention given by way of non-limiting example and with reference to the appended figures in which:
- la figure 1 représente un véhicule dont le pare-chocs arrière comprend un diffuseur arrière selon l'invention, le diffuseur arrière étant en position rétractée ;  - Figure 1 shows a vehicle whose rear bumper comprises a rear diffuser according to the invention, the rear diffuser being in the retracted position;
- la figure 2 représente un véhicule dont le pare-chocs arrière comprend un diffuseur arrière selon l'invention, le diffuseur arrière étant en position déployée ;  - Figure 2 shows a vehicle whose rear bumper comprises a rear diffuser according to the invention, the rear diffuser being in the deployed position;
- la figure 3 est un agrandissement d'un mécanisme motorisé de déploiement et de rétraction du panneau mobile du diffuseur arrière des figures 1 et 2 selon un premier mode de réalisation de l'invention, le mécanisme motorisé étant dans une configuration correspondant au panneau mobile en position rétractée ;  FIG. 3 is an enlargement of a motorized mechanism for deploying and retracting the movable panel of the rear diffuser of FIGS. 1 and 2 according to a first embodiment of the invention, the motorized mechanism being in a configuration corresponding to the movable panel in retracted position;
- la figure 4 est un agrandissement d'un mécanisme motorisé de déploiement et de rétraction du panneau mobile du diffuseur arrière des figures 1 et 2 selon le premier mode de réalisation de l'invention, le mécanisme motorisé étant dans une configuration correspondant au panneau mobile en cours de déploiement ou de rétraction ;  FIG. 4 is an enlargement of a motorized mechanism for deployment and retraction of the movable panel of the rear diffuser of FIGS. 1 and 2 according to the first embodiment of the invention, the motorized mechanism being in a configuration corresponding to the mobile panel during deployment or retraction;
- la figure 5 est un agrandissement d'un mécanisme motorisé de déploiement et de rétraction du panneau mobile du diffuseur arrière des figures 1 et 2 selon le premier mode de réalisation de l'invention, le mécanisme motorisé étant dans une configuration correspondant au panneau mobile en position déployée ; et FIG. 5 is an enlargement of a motorized mechanism for deployment and retraction of the movable panel of the rear diffuser of FIGS. 1 and 2 according to the first embodiment of the invention, the motorized mechanism being in a configuration corresponding to the mobile panel. in the deployed position; and
- la figure 6 est une vue de côté d'un mécanisme motorisé de déploiement et de rétraction du panneau mobile des figures 1 et 2 selon un second mode de réalisation de l'invention. - Figure 6 is a side view of a motorized mechanism for deployment and retraction of the movable panel of Figures 1 and 2 according to a second 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 automotive vehicle body part, more precisely 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.  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.
Les figures 1 et 2 illustrent un diffuseur arrière 2 de véhicule automobile, par exemple réalisé en matière plastique, monté sur un pare-chocs arrière 4, par exemple lui aussi réalisé en matière plastique, et comprenant au moins un panneau mobile 6 entre une position déployée et une position rétractée lorsque le diffuseur arrière 2 est fixé sur le pare-chocs arrière 4 de véhicule automobile, le diffuseur arrière 2 comprenant un mécanisme motorisé apte à permettre à une partie du panneau mobile 6 en position déployée de se plaquer contre la pièce de carrosserie 4, ici le pare-chocs arrière 4, lorsque le diffuseur arrière 2 est fixé sur le pare-chocs arrière 4. Le diffuseur arrière 2 peut également comprendre une partie fixe, par exemple un cadre fixé au pare-chocs arrière 4, non représentée sur les figures.  Figures 1 and 2 illustrate a rear diffuser 2 of a motor vehicle, for example made of plastic, mounted on a rear bumper 4, for example also made of plastic, and comprising at least one movable panel 6 between a position deployed and a retracted position when the rear diffuser 2 is fixed on the rear bumper 4 of a motor vehicle, the rear diffuser 2 comprising a motorized mechanism adapted to allow a portion of the movable panel 6 in the deployed position to press against the piece of the bodywork 4, here the rear bumper 4, when the rear diffuser 2 is fixed on the rear bumper 4. The rear diffuser 2 may also comprise a fixed part, for example a frame fixed to the rear bumper 4, not shown in the figures.
Le diffuseur arrière 2 est par conséquent apte à passer d'une position rétractée représentée à la figure 1 , dans laquelle le panneau mobile 6 peut être plaqué contre le pare-chocs arrière 4, à une position déployée, dans laquelle une extrémité basse 8 du panneau mobile 6 est plaquée sous le pare-chocs arrière 4, plus précisément sous la ligne basse du véhicule correspondant à la ligne de décollement du flux d'air du pare- chocs arrière 4. Cette configuration en position déployée permet d'empêcher l'air de passer au-dessus du panneau mobile ce qui permet d'éviter la formation d'appui selon une direction parallèle à un axe vertical Z tout en permettant de réduire la traînée aérodynamique en repoussant vers l'arrière les points de décollement du flux d'air.  The rear diffuser 2 is therefore able to pass from a retracted position shown in FIG. 1, in which the movable panel 6 can be pressed against the rear bumper 4, in an extended position, in which a lower end 8 of the movable panel 6 is pressed under the rear bumper 4, more precisely under the lower line of the vehicle corresponding to the line of separation of the air flow of the rear bumper 4. This configuration in the deployed position can prevent the air to pass above the movable panel which avoids the formation of support in a direction parallel to a vertical axis Z while allowing to reduce the aerodynamic drag by pushing back the points of separation of the flow of 'air.
Il est possible de conserver une distance de l'ordre de 1 à 2 centimètres entre le pare- chocs arrière 4 et le panneau mobile 6 en position rétractée afin de ménager un espace permettant de contenir des saletés, qui pourraient se déposer lorsque le panneau mobile 6 est en position déployée, et ce sans gêner le mécanisme motorisé.  It is possible to maintain a distance of about 1 to 2 centimeters between the rear bumper 4 and the movable panel 6 in the retracted position to provide a space for containing dirt, which could be deposited when the movable panel 6 is in the deployed position, and without hindering the motorized mechanism.
Le panneau mobile 6 est donc apte, grâce à une trajectoire suivant un mouvement combiné de translation et de rotation, à s'éloigner dans un premier temps du pare-chocs arrière 4 (l'extrémité haute 9 du panneau mobile 6 s'éloigne fortement du pare-chocs arrière) puis à passer sous la jupe du véhicule automobile afin que l'extrémité 8 du panneau mobile 6 soit plaquée sous le pare-chocs arrière 4. La trajectoire du panneau mobile 6 lui permet de s'éloigner du véhicule avant de se plaquer contre ce dernier ce qui permet d'éviter d'endommager le panneau mobile 6 à cause d'éventuels frottements.  The movable panel 6 is therefore able, thanks to a trajectory following a combined movement of translation and rotation, to move away in a first step from the rear bumper 4 (the high end 9 of the movable panel 6 moves away strongly rear bumper) and then pass under the skirt of the motor vehicle so that the end 8 of the movable panel 6 is pressed under the rear bumper 4. The trajectory of the movable panel 6 allows it to move away from the vehicle before to press against the latter which avoids damaging the movable panel 6 because of possible friction.
Le diffuseur arrière 2 peut comprendre un ou plusieurs mécanismes motorisés aptes à déployer et rétracter le panneau mobile 6. Le mécanisme motorisé comprend au moins un engrenage 10 représenté sur les figures 3 à 5. Il peut s'agir d'un seul engrenage situé au centre du diffuseur dans une direction parallèle à l'axe transversal Y du véhicule ou de deux engrenages excentrés. The rear diffuser 2 may comprise one or more motorized mechanisms capable of to deploy and retract the movable panel 6. The motorized mechanism comprises at least one gear 10 shown in Figures 3 to 5. It may be a single gear located in the center of the diffuser in a direction parallel to the transverse axis Y of the vehicle or two eccentric gears.
Cet engrenage 10 peut être composé de deux roues dentées 12 et 14 engrenées. Les deux roues dentées 12 et 14 sont reliées l'une à l'autre par des bielles 16 et 18 montées pivotantes au niveau de leurs points de fixation aux roues dentées 12 et 14. Cela permet à ces dernières de bouger l'une par rapport à l'autre.  This gear 10 may be composed of two gear wheels 12 and 14 geared. The two gears 12 and 14 are connected to each other by rods 16 and 18 pivotally mounted at their points of attachment to the gears 12 and 14. This allows them to move relative to each other. to the other.
La première roue dentée 12 (la plus grosse des deux roues) peut être mise en mouvement par un actionneur (non représenté) pouvant par exemple être un moteur à rotation pouvant être déporté ou non. Cet actionneur peut mettre en rotation la première roue dentée 12 autour de son axe principal A. Cette rotation permet le déplacement de la seconde roue dentée 14 autour de la première roue dentée 12 par interaction entre les dents des deux roues dentées 12 et 14, comme cela est visible sur les figures 3 à 5 sur lesquelles on constate ce déplacement.  The first gearwheel 12 (the larger of the two wheels) can be set in motion by an actuator (not shown) which can for example be a rotational motor that can be deported or not. This actuator can rotate the first gearwheel 12 around its main axis A. This rotation enables the second gearwheel 14 to move around the first toothed wheel 12 by interaction between the teeth of the two toothed wheels 12 and 14, as this is visible in Figures 3 to 5 on which we see this displacement.
La seconde roue dentée 14 (la plus petite des deux roues) comprend, en plus de sa capacité à se déplacer autour de la première roue dentée 12, un bras 20, ici rectiligne, solidaire à une de ces extrémités à la seconde roue dentée 14 et à son autre extrémité au panneau mobile 6 (liaison non représentée sur les figures 3 à 5). Cette liaison permet de transmettre le mouvement de la seconde roue dentée 14 au panneau mobile 6 afin de permettre à ce dernier de se déplacer selon les mouvements indiqués ci-dessus. A cet effet, un dimensionnement approprié des roues dentées 12 et 14, de la taille des dents des roues dentées 12 et 14 ou encore de la taille du bras 20 ainsi que son positionnement entre la roue dentée 14 et le panneau mobile 6 permet d'assurer un mouvement adéquat du panneau mobile 6.  The second toothed wheel 14 (the smaller of the two wheels) comprises, in addition to its ability to move around the first toothed wheel 12, an arm 20, here rectilinear, secured at one of these ends to the second toothed wheel 14 and at its other end to the movable panel 6 (connection not shown in Figures 3 to 5). This connection makes it possible to transmit the movement of the second toothed wheel 14 to the movable panel 6 in order to allow the latter to move according to the movements indicated above. For this purpose, a suitable dimensioning of the gears 12 and 14, the size of the teeth of the gears 12 and 14 or the size of the arm 20 as well as its positioning between the toothed wheel 14 and the movable panel 6 allows ensure adequate movement of the movable panel 6.
Un autre avantage d'un engrenage selon l'invention est que la première roue dentée 12 peut être standardisée et la seconde roue dentée 14 ainsi que le bras 20 sont alors personnalisés en fonction du véhicule comprenant le panneau mobile 6 et du mouvement du panneau mobile 6 que l'on souhaite obtenir pour ce véhicule. L'utilisation d'un engrenage permet d'avoir un mécanisme de déploiement/rétraction compacte et nécessitant peu de composants. La compacité permet également de facilement isoler le mécanisme des gravillons ou des projections de boue et/ou pluie car il ne s'agit pas d'un mécanisme « aéré », c'est-à-dire ne comprenant pas de grands espaces entre les éléments le composant.  Another advantage of a gear according to the invention is that the first gear 12 can be standardized and the second gear 14 and the arm 20 are then customized according to the vehicle comprising the movable panel 6 and the movement of the movable panel 6 wanted for this vehicle. The use of a gear makes it possible to have a compact deployment / retraction mechanism requiring few components. The compactness also makes it easy to isolate the mechanism of the chippings or projections of mud and / or rain because it is not a "ventilated" mechanism, that is to say not including large spaces between them. elements composing it.
II s'agit d'un mécanisme créant des points de verrouillage naturels permettant un bon maintien en position du panneau mobile 6 (peu de jeu ente les pièces et peu de vibration) lorsque l'engrenage est immobile, mais également lorsque le dispositif est en mouvement de déploiement/rétraction (contrairement à un dispositif dans lequel un actionneur est apte à bloquer facilement un panneau mobile dans une direction en présentant un jeu dans l'autre direction sauf à prévoir un effort permanent via un moyen moteur ce qui implique une consommation énergétique importante). This is a mechanism creating natural locking points allowing good retention in position of the movable panel 6 (little play between parts and little vibration) when the gear is stationary, but also when the device is in position. movement deployment / retraction (unlike a device in which an actuator is able to easily block a movable panel in one direction by having a game in the other direction except to provide a permanent force via a motor means which implies a significant energy consumption ).
Lors du déploiement du panneau mobile 6 (par exemple lorsque le véhicule atteint une certaine vitesse), l'engrenage est tout d'abord dans la configuration représentée à la figure 3. L'actionneur met en mouvement la première roue dentée 12 qui tourne autour de son axe principal A. Cela a pour conséquence de déplacer la seconde roue dentée 14 atour de la première roue dentée 12 et, grâce au bras 20, de déplacer le panneau mobile 6 de sa position rétractée à sa position déployée (de la figure 3 à la figure 5 en passant par la figure 4). Le passage du panneau mobile 6 de sa position déployée à sa position rétractée est réalisé de la même manière avec un actionneur permettant à la première roue dentée 12 de tourner en sens inverse par rapport à sa rotation lors du déploiement du panneau mobile 6.  When deploying the mobile panel 6 (for example when the vehicle reaches a certain speed), the gear is first in the configuration shown in Figure 3. The actuator moves the first gear 12 which rotates around its main axis A. This has the effect of moving the second gear 14 around the first gear 12 and, with the arm 20, to move the movable panel 6 from its retracted position to its extended position (of Figure 3). in Figure 5 through Figure 4). The passage of the movable panel 6 from its extended position to its retracted position is performed in the same manner with an actuator allowing the first gear 12 to rotate in the opposite direction relative to its rotation during the deployment of the movable panel 6.
Dans un second mode de réalisation représenté à la figure 6, l'engrenage comprend une came 22 en complément d'une roue 24 et d'une courroie 26. Cette roue 24 est formée de deux roues coaxiales, une roue dentée 24a et une roue crantée 24b, la roue dentée 24a est en contact avec la came 22 qui est dentée tandis que la roue crantée 24b est en contact avec la courroie 26. Ces deux roues 24a et 24b ne sont pas solidaires et tournent librement l'une par rapport à l'autre, tout en restant coaxiale. De plus, de la même façon, le point de fixation 28 est formé de deux roues coaxiales, avec d'une part une roue (non représentée) sur laquelle est fixée la came 22 et d'autre part une roue 28a qui est crantée et qui est en contact avec la courroie 26 (la courroie peut être crantée ou lisse).  In a second embodiment shown in FIG. 6, the gear comprises a cam 22 in addition to a wheel 24 and a belt 26. This wheel 24 is formed of two coaxial wheels, a toothed wheel 24a and a wheel notched 24b, the toothed wheel 24a is in contact with the cam 22 which is toothed while the toothed wheel 24b is in contact with the belt 26. These two wheels 24a and 24b are not integral and freely rotate relative to each other. the other, while remaining coaxial. In addition, in the same way, the fixing point 28 is formed of two coaxial wheels, with on the one hand a wheel (not shown) on which is fixed the cam 22 and on the other hand a wheel 28a which is notched and which is in contact with the belt 26 (the belt may be notched or smooth).
La came 22 est dentée et montée pivotante autour de son point de fixation 28 sur le véhicule. Ce mouvement, symbolisé par la flèche 30, permet de régler la position de l'engrenage (position modifiée en fonction des besoins du véhicule, du type de route, du type de conduite ou encore de la charge emportée du véhicule (pouvant faire varier la garde au sol du véhicule)) et peut être assuré par un actionneur relié à la came 22. La roue dentée 24a est engrenée avec la came 22 et est apte à se déplacer le long de la came 22. La courroie 26 est déformable élastiquement afin de permettre le déplacement des roues 24a et 24b le long de la came tout en maintenant le contact entre la roue dentée 24a et la came 22. La courroie 26 est apte à tourner grâce à un actionneur qui peut être présent au niveau du point de fixation 28 de la came 22 au véhicule et elle entraîne la roue crantée 24b. La roue crantée 24b peut être reliée au panneau mobile 6 de la même manière que la roue dentée 14, c'est-à-dire par l'intermédiaire d'un bras solidaire à une de ces extrémités de la roue crantée 24b et à son autre extrémité solidaire du panneau mobile 6. The cam 22 is toothed and pivotally mounted around its attachment point 28 on the vehicle. This movement, symbolized by the arrow 30, makes it possible to adjust the position of the gearing (position modified according to the needs of the vehicle, the type of road, the type of driving or the load carried away from the vehicle (which can vary the ground clearance of the vehicle)) and can be provided by an actuator connected to the cam 22. The toothed wheel 24a is meshing with the cam 22 and is able to move along the cam 22. The belt 26 is elastically deformable to to allow the wheels 24a and 24b to move along the cam while maintaining contact between the toothed wheel 24a and the cam 22. The belt 26 is rotatable by means of an actuator which may be present at the point of attachment 28 of the cam 22 to the vehicle and it drives the toothed wheel 24b. The toothed wheel 24b can be connected to the movable panel 6 in the same way as the toothed wheel 14, that is to say by means of an arm secured to one of these ends of the toothed wheel 24b and to its other end of solidarity of the mobile panel 6.
Lors du déploiement ou bien avant ce déploiement, l'actionneur permettant le mouvement de la came 22 peut mettre en mouvement la came 22 afin de régler si nécessaire la position du mécanisme de déploiement/rétraction, c'est-à-dire que l'axe de l'engrenage change de position, les roues coaxiales 24a et 24b restent dans les mêmes plans. Ensuite, la courroie 26 est mise en mouvement grâce à la roue 28a qui est actionnée en rotation sur l'axe pour mettre en mouvement la courroie 26, qui engendre la rotation de la roue crantée 24b pour déployer et rétracter le diffuseur arrière. On note au passage que les mouvements de la came 22 et de la courroie 26 sont dissociés dans l'exemple décrit. La mise en mouvement de la came 22 ainsi que sa capacité à se déformer élastiquement permettent un déplacement de la roue dentée 24a le long de la came 22 uniquement pour adapter la position de l'axe des roues coaxiales 24a et 24b. La liaison de la roue crantée 24b au panneau mobile permet un déplacement de ce dernier simultané à celui de cette roue crantée 24b. La rétraction s'effectue de la même manière avec une rotation en sens inverse de la courroie 26.  During the deployment or before this deployment, the actuator allowing the movement of the cam 22 can move the cam 22 to adjust if necessary the position of the deployment / retraction mechanism, that is to say that the axis of the gear changes position, the coaxial wheels 24a and 24b remain in the same planes. Then, the belt 26 is set in motion by the wheel 28a which is rotated on the axis to move the belt 26, which causes the rotation of the toothed wheel 24b to deploy and retract the rear diffuser. Note in passing that the movements of the cam 22 and the belt 26 are dissociated in the example described. The setting in motion of the cam 22 as well as its capacity to deform elastically allow a displacement of the toothed wheel 24a along the cam 22 only to adapt the position of the axis of the coaxial wheels 24a and 24b. The connection of the toothed wheel 24b to the movable panel allows a displacement of the latter simultaneous with that of the toothed wheel 24b. The retraction is performed in the same way with a rotation in opposite direction of the belt 26.
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.
Il est par exemple possible que le ou les engrenages soient composés d'une roue dentée identique à la première roue dentée 12 et de plusieurs autres roues dentées permettant d'obtenir des cinématiques de déploiement du panneau mobile différentes. A l'aide d'un système proche de celui d'une boîte de vitesse, la roue dentée identique à la première roue dentée 12 peut alors mettre en mouvement une des autres roues dentées afin de permettre un déploiement spécifique du panneau mobile, par exemple en fonction des besoins du véhicule, du type de route, du type de conduite ou encore de la charge emportée du véhicule (pouvant faire varier la garde au sol du véhicule). It is for example possible that the gear or gears are composed of a gearwheel identical to the first gearwheel 12 and several other gears to obtain different deployment kinetics of the movable panel. Using a system similar to that of a gearbox, the toothed wheel identical to the first gear 12 can then move one of the other gear wheels to allow a specific deployment of the movable panel, for example depending on the needs of the vehicle, the type of road, the type of driving or the load carried away from the vehicle (which can vary the ground clearance of the vehicle).
Nomenclature Nomenclature
Premier mode de réalisation First embodiment
2 : diffuseur arrière 2: rear diffuser
4 : pare-chocs arrière 4: rear bumper
6 : panneau mobile 6: mobile panel
8 : extrémité basse du panneau mobile  8: low end of the mobile panel
9 : extrémité haute du panneau mobile 9: high end of the mobile panel
10 : engrenage  10: gear
12 : première roue dentée  12: first gear wheel
14 : seconde roue dentée  14: second gear wheel
16, 18 : bielles de liaison  16, 18: Connecting rods
20 : bras 20: arms
A : axe principal de la première roue dentée  A: main axis of the first gear wheel
Second mode de réalisation 22 : came Second Embodiment 22: Cam
24 : roue  24: wheel
24a : roue dentée  24a: toothed wheel
24b : roue crantée  24b: notched wheel
26 : courroie  26: belt
28 : point de fixation de la came au véhicule28: point of attachment of the cam to the vehicle
28a : roue crantée 28a: notched wheel
30 : déplacement de la came  30: moving the cam

Claims

Revendications claims
1 . Diffuseur arrière (2) de véhicule automobile caractérisé en ce qu'il comprend au moins un panneau mobile (6) entre une position déployée et une position rétractée lorsque le diffuseur arrière (2) est fixé sur un pare-chocs arrière (4) de véhicule automobile, 1. Rear diffuser (2) of a motor vehicle characterized in that it comprises at least one movable panel (6) between an extended position and a retracted position when the rear diffuser (2) is fixed on a rear bumper (4) of motor vehicle,
le diffuseur arrière (2) comprenant un mécanisme motorisé comprenant au moins un engrenage (10) apte à permettre à une partie du panneau mobile (6) en position déployée de se plaquer sous le pare-chocs arrière (4) lorsque le diffuseur arrière (2) est fixé sur un pare-chocs arrière 4) de véhicule automobile. the rear diffuser (2) comprising a motorized mechanism comprising at least one gear (10) adapted to allow a portion of the movable panel (6) in the deployed position to press under the rear bumper (4) when the rear diffuser ( 2) is attached to a rear bumper 4) of a motor vehicle.
2. Diffuseur arrière (2) selon la revendication précédente, dans lequel le mécanisme motorisé est apte à permettre un déploiement et une rétraction du panneau mobile (6) selon une trajectoire suivant un mouvement combiné de translation et de rotation. 2. rear diffuser (2) according to the preceding claim, wherein the motorized mechanism is adapted to allow deployment and retraction of the movable panel (6) in a path according to a combined movement of translation and rotation.
3. Diffuseur arrière (2) selon l'une quelconque des revendications précédentes, dans lequel l'engrenage (10) comprend au moins deux roues dentées (12, 14) engrenées. A rear diffuser (2) according to any one of the preceding claims, wherein the gear (10) comprises at least two gear wheels (12, 14) intermeshed.
4. Diffuseur arrière (2) selon la revendication 3, dans lequel les deux roues dentées (12, 14) sont reliées l'une à l'autre par deux bielles (16, 18) montées pivotantes par rapport aux roues dentées (12, 14). Rear diffuser (2) according to claim 3, wherein the two toothed wheels (12, 14) are connected to one another by two connecting rods (16, 18) pivotally mounted with respect to the toothed wheels (12, 14).
5. Diffuseur arrière (2) selon l'une quelconque des revendications 3 et 4, dans lequel une première roue dentée (12) est apte à tourner autour de son axe principal (A), une seconde roue dentée (14) étant apte à se déplacer le long de la première roue dentée (12). 5. rear diffuser (2) according to any one of claims 3 and 4, wherein a first gear (12) is rotatable about its main axis (A), a second gear (14) being adapted to move along the first gear (12).
6. Diffuseur arrière (2) selon l'une quelconque des revendications 3 à 5, dans lequel la seconde roue dentée (14) comprend un bras (20) fixé sur le panneau mobile (6). The rear diffuser (2) according to any one of claims 3 to 5, wherein the second gear (14) comprises an arm (20) fixed to the movable panel (6).
7. Diffuseur arrière (2) selon l'une quelconque des revendications précédentes, dans lequel le mécanisme motorisé comprend une roue (24) et une came (22) apte à permettre la variation de la position de la roue (24). 7. rear diffuser (2) according to any one of the preceding claims, wherein the motorized mechanism comprises a wheel (24) and a cam (22) adapted to allow the variation of the position of the wheel (24).
8. Diffuseur arrière (2) selon la revendication 7, dans lequel le mécanisme motorisé comprend en outre une courroie (26) apte à permettre le déplacement de la roue (24) le long de la came (22). 8. rear diffuser (2) according to claim 7, wherein the motorized mechanism further comprises a belt (26) adapted to allow the displacement of the wheel (24) the along the cam (22).
9. Diffuseur arrière (2) selon l'une quelconque des revendications précédentes, dans lequel le mécanisme motorisé comprend plusieurs engrenages et un dispositif apte à permettre de sélectionner un engrenage parmi lesdits plusieurs engrenages. 9. Rear diffuser (2) according to any one of the preceding claims, wherein the motorized mechanism comprises a plurality of gears and a device adapted to allow selection of a gear among said plurality of gears.
10. Pare-chocs arrière (4) de véhicule automobile comprenant un diffuseur arrière (2) selon l'une quelconque des revendications précédentes. 10. Rear bumper (4) of a motor vehicle comprising a rear diffuser (2) according to any one of the preceding claims.
EP18765444.7A 2017-09-07 2018-09-07 Movable geared rear diffuser Withdrawn EP3678924A1 (en)

Applications Claiming Priority (2)

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FR1758246A FR3070668B1 (en) 2017-09-07 2017-09-07 GEAR MOBILE REAR DIFFUSER
PCT/EP2018/074196 WO2019048636A1 (en) 2017-09-07 2018-09-07 Movable geared rear diffuser

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KR101936983B1 (en) * 2015-09-11 2019-01-10 현대자동차주식회사 Rear bump variable spoiler apparatus for vehicle
DE102015118076A1 (en) * 2015-10-23 2017-04-27 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Heckdiffusoranordnung for a motor vehicle

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FR3070668A1 (en) 2019-03-08
WO2019048636A1 (en) 2019-03-14

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