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

Applications Claiming Priority (2)

Publications (1)

Family

ID=61132490

Family Applications (1)

Country Status (3)

Family Cites Families (4)

• 2017
  • 2017-09-07 FR FR1758246A patent/FR3070668B1/fr not_active Expired - Fee Related
• 2018
  • 2018-09-07 EP EP18765444.7A patent/EP3678924A1/de not_active Withdrawn
  • 2018-09-07 WO PCT/EP2018/074196 patent/WO2019048636A1/fr unknown

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