EP3601020A1 - Dispositif déflecteur mobile de véhicule automobile - Google Patents
Dispositif déflecteur mobile de véhicule automobileInfo
- Publication number
- EP3601020A1 EP3601020A1 EP18718595.4A EP18718595A EP3601020A1 EP 3601020 A1 EP3601020 A1 EP 3601020A1 EP 18718595 A EP18718595 A EP 18718595A EP 3601020 A1 EP3601020 A1 EP 3601020A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall
- deflector device
- deflector
- vehicle
- face
- 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- Withdrawn
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
- B62D35/005—Front 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
-
- 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 motor vehicles and more particularly to deflectors mounted on motor vehicles.
- a movable baffle may be mounted at the front of the vehicle under the front bumper. Such a deflector aims to reduce the drag of the vehicle and therefore its fuel consumption, especially at high speed.
- the deflector which is generally a blade that can have a shape and a height, different according to the vehicles equipped, is in the folded position under the front bumper, to protect it from possible shocks against obstacles, for example curbs. This position is therefore suitable for city traffic at low speeds or on roads with hollows and bumps.
- the blade When the speed of the vehicle reaches a threshold value, the blade is deployed, generally by a rotational movement, to oppose the flow of air and thus reduce the drag of the vehicle.
- the gain in terms of drag may for example be of the order of 5% at a speed of 130 km / h.
- this deployment can be performed by a translation in a vertical plane, as disclosed in US Patent 8,702,152.
- a relatively high speed deployment requires the use of actuating and holding devices in the deployed position. Such devices require high power, and they are therefore energy hungry. Indeed, the movable baffle unfolds by rotation by opposing more and more to a flow of air exerting a strong pressure. Once in the deployed position, the pressure exerted on the deflector is very important. Indeed, the pressure distribution is such that the front face is in excess pressure of the order of the dynamic pressure, and the rear face is in depression of the order of 30% -40% relative to the front face. These two effects are cumulative to form a consequent longitudinal force. For example, the pressure exerted on the deflector may be 200N at 130 km / h.
- the mobile baffle can encounter obstacles, even when the vehicle is traveling at a high speed.
- the deflector made of rigid material, and also the complete system, that is to say the actuator and the clutch, can then be damaged. To avoid this, it is then necessary to provide a device for rapid retraction of the deflector.
- Application FR 3 035 061 describes a deflector mounted on the rear of a vehicle and comprising a deformable skin.
- a deflector mounted on the rear of a vehicle and comprising a deformable skin.
- Such a device aims to create a point of separation of the air flow which will result in creating a downstream depression, which is not beneficial on the effort budget since it is desired to reduce the longitudinal force on the deflector.
- This deflector then does not solve the problem of the pressure exerted on a deflector placed under the front bumper when it is in the deployed position.
- An object of the invention is to eliminate, or at least to significantly limit, all or part of the aforementioned drawbacks by proposing a robust deflector easily deployable and easily maintained in the deployed position.
- the subject of the invention is a mobile baffle device for a motor vehicle, intended to be placed at the front of this vehicle and comprising:
- a wall capable of occupying a retracted position and at least one deployed position
- a device capable of enabling the wall to be deployed and folded
- the wall comprising at least a first face adapted to deflect an air flow in the deployed position, and at least a second face adapted to avoid detachment of the air flow at the rear of the wall.
- the shape of the baffle keeps the flow of air in contact with the vehicle which significantly reduces the creation of depression downstream. Therefore, the force exerted on the deflector is greatly reduced, for example equal to about 20N. This reduction of the force exerted on the deflector makes it possible to use means for actuating and maintaining in the deployed position of the deflector of a lower power than those of the prior art.
- the first face forms, in the deployed position, a first angle with a first plane comprising a longitudinal axis and a transverse axis of the motor vehicle between 30 ° and 90 °, preferably between 50 ° and 80 °;
- the second face forms, in the deployed position, a second angle between 0 ° and 45 ° with a second plane parallel to the first plane, preferably between 10 ° and 30 °; the first angle and the second angle are substantially zero in the retracted position;
- the wall is made of a material that is at least partially extensible
- the wall is a fabric cloth
- the internal device comprises at least one inflatable bladder capable of deforming the wall
- the internal device comprises several jacks able to deform the wall
- the internal device comprises at least one mobile arch adapted to deploy the wall
- the internal device comprises several mobile arches able to pivot about a common axis
- the mobile arch is elastically deformable
- the mobile arch is capable of occupying two stable positions and an unstable position between the two stable positions;
- the wall is a deformable material capable of stretching at least 100%, preferably more than 200%;
- the wall comprises at least one fold zone
- the wall is made of a material chosen from TPU, rubber or SEBS.
- a vehicle comprising a deflector device according to the invention.
- FIG. 1 A is a partial view of a motor vehicle comprising a deflector device according to the prior art
- FIG. 1 B is a partial view of a motor vehicle comprising a deflector device according to the invention
- FIGS. 2 and 3 show respectively the deflector device according to the invention in the retracted position and in the deployed position;
- FIGS. 4A and 4B are views of a wall of the deflector device according to the section plane IV-IV, the wall being in the retracted position and in the deployed position;
- FIG. 5 represents a first embodiment of the deflector device according to the invention
- FIG. 6 represents a first variant of a second embodiment of the deflector device according to the invention.
- FIG. 7 represents a second variant of the second embodiment of the deflector device according to the invention.
- FIG. 8 shows a third embodiment of the deflector device according to the invention.
- orientation terms such as “longitudinal axis X”, “transverse axis Y”, “vertical axis Z”, “front”, “rear”, “above” , “Superior”, “below”, “lower”, etc. These terms are understood by reference to the usual orientation of motor vehicles.
- Figure 1 shows a comparison between a vehicle comprising a deflector device according to the prior art (1A - left part of Figure 1) and a deflector device according to the invention (1 B - right part of Figure 1), and more precisely the evolution of a flow of air propagating around the vehicle in a direction substantially parallel to the longitudinal axis X of the motor vehicle.
- the vehicle 2 comprises a front bumper 4 equipped with a deflector device 6.
- This is a rigid blade that deploys by rotation about an axis located at the level the part of the deflector device 6 fixed to the front bumper 4. As described above, such a blade is folded under the front bumper 4 of the vehicle 2 at low speed and is deployed when the vehicle 2 reaches a high speed.
- a vacuum zone 8 behind the deflector device 6 deployed As explained previously, this leads in part to the exercise of a major effort on the deflector device 6.
- the front bumper 4 is equipped with a deflector device 10 according to the invention.
- the latter comprises a wall 11 comprising a first face 12 adapted, when the deflector device 6 is deployed, to deflect the flow of air moving in a direction opposite to the vehicle moving downwards.
- the wall 11 also comprises a second face 14 situated in the extension of the first face 12 and making it possible to maintain the flow of air in contact with the deflector device 10. Consequently, this second face 14 makes it possible to maintain the flow of air in contact with the vehicle 2 at the rear of the deflector device 10.
- Figure 2 shows the deflector device 10 in the retracted position. In this configuration, the airflow is undeflected. The wall 11 of the deflector device 10 is then in contact with the underside of the front shield 4.
- Figure 3 represents the deflector device 10 in the deployed position.
- the passage from the retracted position to the deployed position, and vice versa, is possible because the wall 11 of the deflector device 10 can be made of a deformable material that can stretch.
- It may be, for example, TPU (thermoplastic polyurethane), rubber, SEBS (polystyrene-b-poly (ethylene-butylene) -b-polystyrene), capable of stretching by at least 100% and advantageously of more than 200%.
- the material has the property of returning to its initial shape in retracted conformation after stretching. Thanks to these properties, an aerodynamic active body element is obtained which is flexible and able to pass from an extended shape to a retracted form, without displacement of this element relative to the other surrounding parts.
- the wall can be made in a cloth fabric adapted to be deployed as a car top, as will be described later in one embodiment of the invention.
- the wall 11 can comprise, alternately or in addition to its ability to deform, two fold zones 28 and 29 at the zone of the wall 11 where the extension of the latter is when the deflector device 10 is in the deployed position (the number of folding zones may vary).
- the wall 11 may have at the fold zones 28 and 29 a lower mechanical strength to ensure that the folds are made in the right place, for example by thinning the wall 11 in these areas.
- the possibility of stretching the wall 11 constituting the deflector device 10 also opens the way to a large number of possible forms in order to achieve the aforementioned objectives, for example by variations in thickness which give rise to more rigid zones allowing obtain an expanded form with a shape optimizing the performance of the deflector device 10.
- the deflector device 10 may be deployed transversely to the direction of the air flow around the deflector device 10, which makes it possible to avoid increasing opposition to the air flow during a deployment by rotation.
- the first face 12 forms an angle ⁇ of between 30 ° and 90 °, preferably between 50 ° and 80 °, with a plane P comprising the longitudinal axis X and the transverse axis Y of the vehicle.
- This angle a makes it possible to deflect the air arriving at the level of the first face 12 of the deflector device 10.
- the second face 14 forms an angle ⁇ between 0 ° and 45 °, preferably between 10 ° and 30 °, with a plan P ' parallel to the plane P.
- This angle ⁇ is sufficient to maintain the flow of air in contact with the deflector device 10 during the passage of the air flow from the first face 12 to the second face 14 and the contact of the vehicle 2 to the rear of baffle 10.
- the deployment of the deflector device 10 will be such that at any time during deployment the resulting forces on the actuator are not predominantly carried by the longitudinal axis of the vehicle. Such a deployment minimizes the constraints of the airflow on the deflector device 10 during its deployment, which makes it possible to envisage a deployment via means of a relatively moderate power.
- Figure 5 shows the deflector device 10 in the deployed position according to a first embodiment of the invention.
- the deflector device 10 is deployed and retracted by means of a device 15 comprising an inflatable bladder 16.
- This inflatable bladder 16 can be connected to a compressor 18 located inside the front bumper, and connected to means allowing its start (not shown).
- the inflatable bladder 16 can be placed at different levels under the wall 11 of the deflector device 10. It is also possible to provide a bladder of a larger or smaller size and of a particular shape for achieve a deflector device 10 of the desired shape. In the same way, it is possible to provide several inflatable bladders inflating simultaneously or in a certain sequence, so that a same deflector device can adopt several different deployed forms, for example depending on the speed of the vehicle.
- a disengagement device may be provided.
- FIG. 6 represents the deflector device 10 in the deployed position according to a first variant of a second embodiment of the invention.
- the deflector device 10 is deployed and retracted through a device 19 comprising a plurality of arches 20 pivoting about an axis 22.
- the movement of the arches is then provided by an actuator (not shown) connected to means allowing its start (not shown).
- the arches have a U-shape, each end of the U being fixed at an axis of rotation common to all the arches 20.
- the device 19 for the deployment and retraction of the deflector device then present similarities with a device for deploying and retracting a car top.
- the wall of the deflector device 10 may be made in a fabric fabric, for example similar to that of a car top. It can also be made of a deformable material, material deformed by the device 19.
- FIG. 7 represents a deflector device according to a second variant of the second embodiment of the invention.
- the device 19 may comprise a bow 20 deformable and may itself comprise two blades.
- the number of hoops 20 present in the deflector device 10 may vary. If the deflector device 10 comprises several deformable poles 20, the latter will not have the same axis of rotation.
- the hoop 20 is connected to the wall 11, elastically deformable, via connection points 30 and 32.
- the connection points 30 connect the hoop assembly 20 / wall 11 to the front bumper 4 of the vehicle 2.
- the point link 32 connects only the hoop 20 to the wall 11.
- the arch assembly 20 / wall 11 can occupy two stable positions, a retracted position shown in solid lines in FIG. 7 and an extended position shown in dotted lines in this same figure, occupying an unstable intermediate position between the two, thus ensuring the transition from one stable position to another.
- a passage may be achieved by at least one actuator present at a connection point 30 forcing the deformation of the arch 20 and therefore the passage of the wall 11 from a retracted position to an extended position and vice versa.
- Figure 8 shows the deflector device 10 in the deployed position according to a third embodiment of the invention.
- the deflector device 10 is deployed and retracted via a device 24 comprising jacks (represented by the arrows 26) adapted to deform the wall of the deflector device.
- a device 24 comprising jacks (represented by the arrows 26) adapted to deform the wall of the deflector device.
- the number of cylinders 26, the size of these cylinders 26, and their positioning allows to determine the shape of the deflector device 10 deployed.
- the cylinders are activated in a sequence, so that the same deflector device can adopt several different deployed forms, for example depending on the speed of the vehicle.
- the deployment means return to their initial position and the deflector device 10 resumes a shape corresponding to its retracted position.
- the deflector device 10 has a shape different from that illustrated while retaining the advantages described above.
Landscapes
- 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
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1752651A FR3064585A1 (fr) | 2017-03-29 | 2017-03-29 | Dispositif deflecteur mobile de vehicule automobile |
| PCT/FR2018/050775 WO2018178579A1 (fr) | 2017-03-29 | 2018-03-29 | Dispositif déflecteur mobile de véhicule automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3601020A1 true EP3601020A1 (fr) | 2020-02-05 |
Family
ID=58707902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18718595.4A Withdrawn EP3601020A1 (fr) | 2017-03-29 | 2018-03-29 | Dispositif déflecteur mobile de véhicule automobile |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3601020A1 (fr) |
| FR (1) | FR3064585A1 (fr) |
| MA (1) | MA48995A (fr) |
| WO (1) | WO2018178579A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12448060B2 (en) | 2023-03-08 | 2025-10-21 | Honda Motor Co., Ltd. | Pneumatic bladder aerodynamic device |
| US12576926B2 (en) | 2023-03-08 | 2026-03-17 | Honda Motor Co., Ltd. | Pneumatic bladder aerodynamic device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3097520A1 (fr) | 2019-06-19 | 2020-12-25 | Compagnie Plastic Omnium | dispositif déflecteur d’air actif de véhicule automobile |
| DE102020006694A1 (de) * | 2020-11-02 | 2022-05-05 | Daimler Ag | Luftleiteinrichtung für einen Personenkraftwagen sowie Personenkraftwagen |
| FR3132496B1 (fr) | 2022-02-08 | 2024-01-19 | Cie Plastic Omnium Se | Elément de carrosserie à déformation pilotée de véhicule automobile |
| FR3162698A1 (fr) * | 2024-05-30 | 2025-12-05 | Stellantis Auto Sas | Face avant de véhicule automobile intégrant un système gonflable actif et véhicule automobile comprenant une telle face avant |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3630645A1 (de) * | 1986-09-09 | 1988-03-10 | Daimler Benz Ag | Frontverkleidung fuer fahrzeuge, insbesondere personenkraftwagen |
| US7686382B2 (en) | 2005-10-12 | 2010-03-30 | Gm Global Technology Operations, Inc. | Reversibly deployable air dam |
| DE102005048924A1 (de) * | 2005-10-13 | 2007-04-19 | Bayerische Motoren Werke Ag | Fahrzeug mit einem ausfahrbaren Unterbodenluftleitelement |
| NL2000328C2 (nl) * | 2006-11-23 | 2008-05-26 | Vredestein Banden B V | Werkwijze voor het onderling hechten van vormdelen uit gevulkaniseerd rubber. |
| US8702152B1 (en) | 2013-01-11 | 2014-04-22 | Ford Global Technologies, Llc | Deployable front air dam |
| DE102014104156A1 (de) * | 2014-03-26 | 2015-10-01 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Luftleiteinrichtung für ein Kraftfahrzeug |
| US9381957B1 (en) * | 2015-04-09 | 2016-07-05 | GM Global Technology Operations LLC | Adaptable aerodynamic spoiler for a motor vehicle |
| FR3035061A1 (fr) | 2015-04-17 | 2016-10-21 | Plastic Omnium Cie | Element de carrosserie a l'arriere d'un vehicule automobile avec une peau externe extensible et un poussoir interne rigide |
-
2017
- 2017-03-29 FR FR1752651A patent/FR3064585A1/fr not_active Ceased
-
2018
- 2018-03-29 EP EP18718595.4A patent/EP3601020A1/fr not_active Withdrawn
- 2018-03-29 MA MA048995A patent/MA48995A/fr unknown
- 2018-03-29 WO PCT/FR2018/050775 patent/WO2018178579A1/fr not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12448060B2 (en) | 2023-03-08 | 2025-10-21 | Honda Motor Co., Ltd. | Pneumatic bladder aerodynamic device |
| US12576926B2 (en) | 2023-03-08 | 2026-03-17 | Honda Motor Co., Ltd. | Pneumatic bladder aerodynamic device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018178579A1 (fr) | 2018-10-04 |
| FR3064585A1 (fr) | 2018-10-05 |
| MA48995A (fr) | 2020-02-05 |
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