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
• • 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, 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.
• 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.
• the diffuser 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
• SUBSTITUTE SHEET (RULE 26) unsightly for the motorist, as it affects the overall appearance 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 opening 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 panel obstructing the opening is partly hidden behind the first panel when the diffuser is in the retracted position. Thus, part of this panel is visible in this position, which affects the aesthetics of the vehicle.
• the invention aims to overcome these disadvantages by providing a vehicle body part comprising a rear diffuser not clogging 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 motor vehicle body part which comprises a rear diffuser comprising at least one primary panel and at least one secondary panel, each of these panels being movable between an extended position and a retracted position, characterized in that when the bodywork part is fixed on a motor vehicle, the secondary panel is completely invisible from the outside in the retracted position and obstructs an opening between the bodywork part and the primary panel in the deployed position, the secondary panel being mechanically connected to an upper part of the bodywork part.
• the secondary panel obstructs, at least partially an opening created during deployment between the primary panel and the rest of the bodywork part of the vehicle. When it is deployed, three openings are created, a central unit between the primary panel and the bodywork part, and two lateral ones on the sides of the body.
• SUBSTITUTE SHEET (RULE 26) 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. In this way, the body part 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 entirely housed inside the vehicle in the retracted position, makes it possible to have a primary panel over the entire surface of the opening of the bodywork part. This is advantageous from an aesthetic point of view when the rear diffuser is in the retracted position.
• the secondary panel is hidden in the retracted position, so it is protected from dirt 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 is disposed behind the primary panel when the diffuser is in the retracted position.
• This arrangement provides an optimal compactness of the diffuser, making its integration into a body part (typically a rear bumper) easy, because of the small space occupied.
• the bodywork part may comprise one or more of the following features, taken alone or in combination:
• an end point of the secondary panel performs a linear translational movement relative to the primary panel or any other movement in which the end point remains at a substantially constant distance from the primary panel, when the diffuser moves from its retracted position to its deployed position and vice versa, so as to limit as far as possible a distance between the two panels;
• the secondary panel performs a simple rotational movement relative to the body part with which the panel is bound;
• the primary panel is devoid of a direct mechanical connection with the secondary panel
• the secondary panel is connected to the primary panel via a translation element able to translate on the primary panel;
• the secondary panel is connected to the primary panel by an annular linear connection
• the primary panel may have a complex shape on its inner side allowing the secondary panel to follow it to the nearest, limiting the space between the two parts during movement;
• the bodywork part comprises a motorized mechanism adapted to allow the deployment and retraction of the primary and secondary panels;
• the bodywork part comprises several primary panels, for example three;
• the bodywork part comprises several secondary panels, for example three;
• the body part is a rear bumper
• the secondary panel is able to prevent the intrusion of foreign bodies between the bodywork part and the primary panel;
• the primary panel and the secondary panel each have an inner face facing the vehicle, an outer face facing the outside of the vehicle, the outer face of the secondary panel being opposite the inner face of the primary panel when the diffuser is in the retracted position.
• 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 deployed 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 retracted position.
• 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.
• FIGs 1 and 2 illustrate a rear diffuser 10, for example made of plastic, of a motor vehicle mounted on a vehicle body part, here a rear bumper 40, for example also made of plastic, comprising a panel 20 and at least one secondary panel 30, each of these panels being movable between an extended position (illustrated in Figure 1) and a retracted position (illustrated in Figure 2) when the rear diffuser 10 is fixed on the bodywork part (in this case the rear bumper 40).
• the secondary panel 30 obstructs an opening 50 in the bodywork part when the diffuser 10 is in the deployed position.
• the diffuser 10 is therefore able to move from an extended position shown in FIG. 1 to a retracted 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. This concavity may be more marked than in FIGS. 1 and 2.
• This panel may also have a more complex profile, or have a straight profile.
• a secondary panel 30 is connected to the upper part 42 of the bumper 40. This connection is made in the form of a pivot between these two parts.
• the secondary panel 30 is free in simple rotation relative to the bodywork part. Such relative movement between these parts being simple to operate, this has the advantage of facilitating the design of the diffuser 10, and also to facilitate its maintenance and allow operation with a less bulky system
• the secondary panel 30 has an inner face 32 which faces the vehicle when the bodywork part is mounted on it, and an outer face 34 which faces outwards.
• the primary panel 20 has an internal face 22 facing the vehicle when the bodywork part is mounted on a vehicle, and an outer face 24.
• the outer face 34 of the panel secondary 30 is opposite the inner face 22 of the primary panel 20.
• the diffuser 10 occupies a small space when it is in the retracted position in the bodywork part, which facilitates its integration into the vehicle.
• the shape of the secondary panel 30 is intended to marry at
• the secondary panel 30 is connected to the primary panel 20 via a translation element 38.
• This element attached to the secondary panel 30 can be connected to the primary panel with a slide (not shown).
• the movement of one of the two panels 20, 30 can cause the movement of the other panel 20, 30.
• This advantageously makes it possible to actuate the deployment and retraction of the diffuser 10 by actuating only one of the two panels, namely the primary 20, the secondary 30.
• it facilitates the maintenance and manufacture of the diffuser 10, and makes it less expensive, more compact, and lighter.
• the primary panel 20 is devoid of mechanical connection with the secondary panel 30.
• this makes it possible to economize a connection between the panels 20, 30.
• this makes it possible to have primary and secondary panels 30 which are never in contact with each other, whether in the extended or retracted position or between these two positions. This absence of contact prevents friction between these two parts 20, 30 and thus prevent wear on the inner surface 22 of the primary panel 20 and the outer surface 34 of the secondary panel 30.
• the outer surface 34 of the secondary panel is preserved and retains a good aesthetic appearance.
• Deployment and retraction of the primary 20 and secondary 30 panels of the diffuser 10 may be achieved via one or more rotary or translational actuators (not shown) associated with a kinematic or direct drive assembly.
• rotary or translational actuators (not shown) associated with a kinematic or direct drive assembly.
• actuation modes are feasible, be it a mechanical actuator, pneumatic, electrical or hydraulic.
• a mechanical actuator it can be adapted on demand to a kinematic assembly, for example with a connecting rod-crank system, or a return by one or more spring (s) for example.
• the actuator may cause the movement of the primary panel 20, which will then drive the secondary panel 30 through the translation member 38.
• the actuator can cause the movement of the primary panel 20, which will then drive the secondary panel 30 through the translation member 38.
• the actuator can cause the movement of the primary panel 20, which will then drive the secondary panel 30 through the translation member 38.
• SUBSTITUTE SHEET (RULE 26) driving the secondary panel 30 which drives the translation member 38 which subsequently drives the primary panel 20.
• the actuator can drive the translation member 38, which will drive the two panels with him.
• the actuator can also drive the secondary panel 30 being connected to the pivot connection 36, the secondary panel then driving the translation member 38 which itself drives the primary panel. Having a single actuation for both panels is particularly advantageous because it makes it possible to use only one actuating device. This makes the system less expensive, easier to assemble, and easier to maintain.
• the two panels 20, 30 may each have an actuating device, and be controlled simultaneously.
• 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 oriented almost perpendicularly to the primary panel 20.
• the assembly of the secondary panel 30 and the primary panel 20 at least partially obstructs an opening of the bumper 50.
• the deployment of the primary panel 20 creates three openings, one central between the primary panel and the bumper 50, and two lateral sides (along the Y axis and not shown here) of the primary panel 20.
• the secondary panel 30 obstructs the central opening 50, when the diffuser 10 is in the deployed position.
• the primary panel 20 may have a generally "U" shape allowing it to obstruct the lateral openings between the latter and the bumper 50, when the diffuser is in the deployed 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 dirt of all kinds, such as mud, snow or dust, or any other type of foreign bodies to the vehicle.
• 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
• the actuator drives the movement of primary and secondary panels 30 (as previously described).
• the secondary panel 30 performs a simple rotational movement with respect to the upper portion 42 of the bumper 40.
• the primary panel 20 also moves to come into the deployed position. It can perform any kind of movement to come into this position, for example a movement consisting of several rotations and translations relative to the rear bumper 40 of the vehicle.
• an end point of the secondary panel 30, which may for example coincide with the translation element 38, translates relative to the primary panel 20.
• the secondary panel 30 is placed in position. in order 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.
• the secondary panel 30 performs a combined movement of several simultaneous rotations around different axes of rotation relative to the body part 40 to which it is connected. This movement can be ensured by means of one or more connecting rods connecting the secondary panel 30 and the upper part of the bumper 42. This trajectory may allow, for example, to limit as much as possible the space between the two panels. during deployment and retraction.
• This particular kinematics of the secondary panel 30 has many advantages.
• the actuator for the deployment and retraction of the diffuser 10 is protected from soiling.
• the risk of blocking the device is greatly reduced.
• the wear of the mechanical elements of the diffuser 10 is greatly reduced by their protection against soiling.
• using a rigid secondary panel 30, which can be painted (especially in the same shade as the rest of the vehicle), allows to give an aesthetic diffuser 10 which is consistent with the rest of the vehicle.
• such a rigid panel 30 has a much better
• SUBSTITUTE SHEET (RULE 26) resistance to fatigue than using, for example, a flexible element.
• the diffuser may for example have several secondary panels, for example three. This allows the diffuser to marry the concave shape of the body part, the bumpers of the vehicles often having curved shapes, while having three panels 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 has 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 -chocs.
• the diffuser may comprise several primary panels, for example three.
• the diffuser may have a greater concavity, which is particularly advantageous, especially when the body part has a strong concavity.
• the rear diffuser can, instead of being inserted into an opening of the rear bumper of the vehicle, be inserted between a rear bumper and a sill of the vehicle.

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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)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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Citations (4)

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• 2017
  • 2017-11-22 FR FR1761051A patent/FR3073809B1/fr active Active
• 2018
  • 2018-11-22 WO PCT/EP2018/082249 patent/WO2019101875A1/fr unknown
  • 2018-11-22 CN CN201880074636.7A patent/CN111356627B/zh active Active
  • 2018-11-22 EP EP18807625.1A patent/EP3713818A1/fr not_active Withdrawn

Patent Citations (4)

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